The file /root/traccar-geocoder/builder/tools/geocoder_diff.cpp has been updated successfully.

    // Entry/cell files: use old directly (rebuilt entries differ subtly)
    diff_file(PatchFileId::GEO_CELLS, "geo_cells.bin", true);
    diff_file(PatchFileId::STREET_ENTRIES, "street_entries.bin", true);
    diff_file(PatchFileId::ADDR_ENTRIES, "addr_entries.bin", true);
    diff_file(PatchFileId::INTERP_ENTRIES, "interp_entries.bin", true);
    diff_file(PatchFileId::ADMIN_CELLS, "admin_cells.bin", true);
    diff_file(PatchFileId::ADMIN_ENTRIES, "admin_entries.bin", true);

// geocoder-diff: Compare two deterministic geocoder builds, produce a .gcpatch.
//
// Three-level remapping for minimal patches:
// 1. String remap: old string offsets → new string offsets
// 2. Record ID remap: match records by content, map old_id → new_id
// 3. Entry remap: apply record ID remap to entry files + rebuild cell indexes
//
// Usage: geocoder-diff <old-dir> <new-dir> -o <patch-file>

#include <algorithm>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <string>
#include <unistd.h>
#include <unordered_map>
#include <vector>

#include "patch_format.h"

// --- String remap ---

static std::unordered_map<uint32_t, uint32_t> build_string_remap(
    const std::vector<char>& old_pool, const std::vector<char>& new_pool)
{
    std::unordered_map<std::string, uint32_t> new_idx;
    size_t pos = 0;
    while (pos < new_pool.size()) {
        const char* s = new_pool.data() + pos;
        size_t len = strlen(s);
        new_idx[std::string(s, len)] = static_cast<uint32_t>(pos);
        pos += len + 1;
    }
    std::unordered_map<uint32_t, uint32_t> remap;
    pos = 0;
    while (pos < old_pool.size()) {
        const char* s = old_pool.data() + pos;
        size_t len = strlen(s);
        auto it = new_idx.find(std::string(s, len));
        if (it != new_idx.end())
            remap[static_cast<uint32_t>(pos)] = it->second;
        pos += len + 1;
    }
    return remap;
}

// --- Remap helpers ---

static void remap_addr_points(std::vector<char>& data, const std::unordered_map<uint32_t,uint32_t>& rm) {
    for (size_t i = 0; i + 16 <= data.size(); i += 16)
        for (size_t off : {8, 12}) {
            uint32_t v; memcpy(&v, data.data() + i + off, 4);
            auto it = rm.find(v);
            if (it != rm.end()) memcpy(data.data() + i + off, &it->second, 4);
        }
}

static void remap_field(std::vector<char>& data, size_t stride, size_t field_off,
                         const std::unordered_map<uint32_t,uint32_t>& rm) {
    for (size_t i = 0; i + stride <= data.size(); i += stride) {
        uint32_t v; memcpy(&v, data.data() + i + field_off, 4);
        auto it = rm.find(v);
        if (it != rm.end()) memcpy(data.data() + i + field_off, &it->second, 4);
    }
}

// --- Content-based record matching ---
// Returns old_id → new_id mapping

static uint64_t fnv_mix(uint64_t h, uint64_t v) { h ^= v; h *= 1099511628211ULL; return h; }

static std::vector<uint32_t> match_addr_points(
    const std::vector<char>& old_data, const std::vector<char>& new_data)
{
    // After string remap, matching records are byte-identical
    size_t old_n = old_data.size() / 16, new_n = new_data.size() / 16;
    // Hash each new record
    std::unordered_multimap<uint64_t, uint32_t> new_map;
    new_map.reserve(new_n);
    for (uint32_t i = 0; i < new_n; i++) {
        uint64_t h = 14695981039346656037ULL;
        const char* p = new_data.data() + i * 16;
        for (int j = 0; j < 16; j++) h = fnv_mix(h, (uint8_t)p[j]);
        new_map.emplace(h, i);
    }
    std::vector<uint32_t> result(old_n, 0xFFFFFFFF);
    size_t matched = 0;
    for (uint32_t i = 0; i < old_n; i++) {
        uint64_t h = 14695981039346656037ULL;
        const char* p = old_data.data() + i * 16;
        for (int j = 0; j < 16; j++) h = fnv_mix(h, (uint8_t)p[j]);
        auto it = new_map.find(h);
        if (it != new_map.end() &&
            memcmp(old_data.data() + i * 16, new_data.data() + it->second * 16, 16) == 0) {
            result[i] = it->second;
            new_map.erase(it);
            matched++;
        }
    }
    std::cerr << "    addr matched=" << matched << "/" << old_n << " new=" << new_map.size() << std::endl;
    return result;
}

static std::vector<uint32_t> match_ways(
    const std::vector<char>& old_ways, const std::vector<char>& old_nodes,
    const std::vector<char>& new_ways, const std::vector<char>& new_nodes,
    size_t stride)
{
    size_t name_off = (stride == 12) ? 8 : 5;
    size_t old_n = old_ways.size() / stride, new_n = new_ways.size() / stride;

    size_t old_node_count = old_nodes.size() / 8, new_node_count = new_nodes.size() / 8;
    auto way_hash = [&](const char* w, const char* nodes, size_t max_nodes) -> uint64_t {
        uint32_t node_offset, name_id; uint8_t node_count;
        memcpy(&node_offset, w, 4); node_count = (uint8_t)w[4];
        memcpy(&name_id, w + name_off, 4);
        uint64_t h = 14695981039346656037ULL;
        h = fnv_mix(h, name_id); h = fnv_mix(h, node_count);
        for (uint8_t j = 0; j < node_count && (node_offset + j) < max_nodes; j++) {
            float lat, lng;
            memcpy(&lat, nodes + (node_offset + j) * 8, 4);
            memcpy(&lng, nodes + (node_offset + j) * 8 + 4, 4);
            h = fnv_mix(h, to_grid(lat)); h = fnv_mix(h, to_grid(lng));
        }
        return h;
    };

    std::unordered_multimap<uint64_t, uint32_t> new_map;
    new_map.reserve(new_n);
    for (uint32_t i = 0; i < new_n; i++)
        new_map.emplace(way_hash(new_ways.data() + i * stride, new_nodes.data(), new_node_count), i);

    std::vector<uint32_t> result(old_n, 0xFFFFFFFF);
    size_t matched = 0;
    for (uint32_t i = 0; i < old_n; i++) {
        uint64_t h = way_hash(old_ways.data() + i * stride, old_nodes.data(), old_node_count);
        auto it = new_map.find(h);
        if (it != new_map.end()) {
            result[i] = it->second;
            // Also fix node_offset in old to match new (makes way bytes identical)
            uint32_t new_node_off;
            memcpy(&new_node_off, new_ways.data() + it->second * stride, 4);
            memcpy(const_cast<char*>(old_ways.data()) + i * stride, &new_node_off, 4);
            new_map.erase(it);
            matched++;
        }
    }
    std::cerr << "    ways matched=" << matched << "/" << old_n << " new=" << new_map.size() << std::endl;
    return result;
}

static std::vector<uint32_t> match_admin(
    const std::vector<char>& old_polys, const std::vector<char>& old_verts,
    const std::vector<char>& new_polys, const std::vector<char>& new_verts,
    size_t stride)
{
    size_t old_n = old_polys.size() / stride, new_n = new_polys.size() / stride;

    size_t old_vc = old_verts.size() / 8, new_vc = new_verts.size() / 8;
    auto poly_hash = [&](const char* p, const char* verts, size_t max_v) -> uint64_t {
        uint32_t vert_offset, vert_count, name_id;
        memcpy(&vert_offset, p, 4); memcpy(&vert_count, p + 4, 4);
        memcpy(&name_id, p + 8, 4);
        uint8_t level = (uint8_t)p[12];
        uint16_t cc; memcpy(&cc, p + stride - 2, 2);
        uint64_t h = 14695981039346656037ULL;
        h = fnv_mix(h, name_id); h = fnv_mix(h, level); h = fnv_mix(h, cc);
        h = fnv_mix(h, vert_count);
        uint32_t n = std::min(vert_count, 10u);
        for (uint32_t j = 0; j < n && (vert_offset + j) < max_v; j++) {
            float lat, lng;
            memcpy(&lat, verts + (vert_offset + j) * 8, 4);
            memcpy(&lng, verts + (vert_offset + j) * 8 + 4, 4);
            h = fnv_mix(h, to_grid(lat)); h = fnv_mix(h, to_grid(lng));
        }
        return h;
    };

    std::unordered_multimap<uint64_t, uint32_t> new_map;
    new_map.reserve(new_n);
    for (uint32_t i = 0; i < new_n; i++)
        new_map.emplace(poly_hash(new_polys.data() + i * stride, new_verts.data(), new_vc), i);

    std::vector<uint32_t> result(old_n, 0xFFFFFFFF);
    size_t matched = 0;
    for (uint32_t i = 0; i < old_n; i++) {
        uint64_t h = poly_hash(old_polys.data() + i * stride, old_verts.data(), old_vc);
        auto it = new_map.find(h);
        if (it != new_map.end()) {
            result[i] = it->second;
            uint32_t new_vert_off;
            memcpy(&new_vert_off, new_polys.data() + it->second * stride, 4);
            memcpy(const_cast<char*>(old_polys.data()) + i * stride, &new_vert_off, 4);
            new_map.erase(it);
            matched++;
        }
    }
    std::cerr << "    admin matched=" << matched << "/" << old_n << " new=" << new_map.size() << std::endl;
    return result;
}

// Match interp ways by content
static std::vector<uint32_t> match_interps(
    const std::vector<char>& old_data, const std::vector<char>& old_nodes,
    const std::vector<char>& new_data, const std::vector<char>& new_nodes,
    size_t stride)
{
    size_t street_off = (stride >= 20) ? 8 : 5;
    size_t old_n = old_data.size() / stride, new_n = new_data.size() / stride;

    size_t old_nc = old_nodes.size() / 8, new_nc = new_nodes.size() / 8;
    auto ihash = [&](const char* p, const char* nodes, size_t max_n) -> uint64_t {
        uint32_t node_offset, street_id, start, end;
        uint8_t count, itype;
        memcpy(&node_offset, p, 4); count = (uint8_t)p[4];
        memcpy(&street_id, p + street_off, 4);
        memcpy(&start, p + street_off + 4, 4);
        memcpy(&end, p + street_off + 8, 4);
        itype = (street_off + 12 < stride) ? (uint8_t)p[street_off + 12] : 0;
        uint64_t h = 14695981039346656037ULL;
        h = fnv_mix(h, street_id); h = fnv_mix(h, start);
        h = fnv_mix(h, end); h = fnv_mix(h, itype); h = fnv_mix(h, count);
        for (uint8_t j = 0; j < count && (node_offset + j) < max_n; j++) {
            float lat, lng;
            memcpy(&lat, nodes + (node_offset + j) * 8, 4);
            memcpy(&lng, nodes + (node_offset + j) * 8 + 4, 4);
            h = fnv_mix(h, to_grid(lat)); h = fnv_mix(h, to_grid(lng));
        }
        return h;
    };

    std::unordered_multimap<uint64_t, uint32_t> new_map;
    new_map.reserve(new_n);
    for (uint32_t i = 0; i < new_n; i++)
        new_map.emplace(ihash(new_data.data() + i * stride, new_nodes.data(), new_nc), i);

    std::vector<uint32_t> result(old_n, 0xFFFFFFFF);
    size_t matched = 0;
    for (uint32_t i = 0; i < old_n; i++) {
        uint64_t h = ihash(old_data.data() + i * stride, old_nodes.data(), old_nc);
        auto it = new_map.find(h);
        if (it != new_map.end()) {
            result[i] = it->second;
            uint32_t new_node_off;
            memcpy(&new_node_off, new_data.data() + it->second * stride, 4);
            memcpy(const_cast<char*>(old_data.data()) + i * stride, &new_node_off, 4);
            new_map.erase(it);
            matched++;
        }
    }
    std::cerr << "    interps matched=" << matched << "/" << old_n << " new=" << new_map.size() << std::endl;
    return result;
}

// --- Entry file remapping ---
// Parse geo_cells + entries, remap IDs, rebuild entry + cell files.

static void remap_and_rebuild_entries(
    const std::string& old_dir, const std::string& new_dir, const std::string& tmpdir,
    const std::vector<uint32_t>& way_remap,
    const std::vector<uint32_t>& addr_remap,
    const std::vector<uint32_t>& interp_remap,
    const std::vector<uint32_t>& admin_remap)
{
    // For geo entries: parse old entries, remap IDs, then copy NEW entries/cells
    // (since the new files have the correct structure for the new build).
    // We write the remapped old entries + new cells to temp for zstd diffing.

    // Simpler approach: just copy new entry/cell files to temp dir.
    // The zstd diff of old vs new entry files won't benefit from ID remapping
    // unless we actually remap the old entries. Let's do the full remap.

    auto parse_entries = [](const std::vector<char>& cells_data, size_t cell_stride, size_t off_pos,
                            const std::vector<char>& entries_data)
        -> std::unordered_map<uint64_t, std::vector<uint32_t>>
    {
        std::unordered_map<uint64_t, std::vector<uint32_t>> result;
        size_t n = cells_data.size() / cell_stride;
        for (size_t i = 0; i < n; i++) {
            uint64_t cell_id; uint32_t off;
            memcpy(&cell_id, cells_data.data() + i * cell_stride, 8);
            memcpy(&off, cells_data.data() + i * cell_stride + off_pos, 4);
            if (off == 0xFFFFFFFF || off + 2 > entries_data.size()) continue;
            uint16_t count;
            memcpy(&count, entries_data.data() + off, 2);
            if (off + 2 + count * 4 > entries_data.size()) continue;
            std::vector<uint32_t> ids(count);
            memcpy(ids.data(), entries_data.data() + off + 2, count * 4);
            result[cell_id] = std::move(ids);
        }
        return result;
    };

    auto remap_ids = [](std::unordered_map<uint64_t, std::vector<uint32_t>>& cells,
                         const std::vector<uint32_t>& id_remap, bool has_flags = false) {
        for (auto& [cid, ids] : cells) {
            for (auto& id : ids) {
                uint32_t flags = has_flags ? (id & 0x80000000u) : 0;
                uint32_t masked = id & 0x7FFFFFFFu;
                if (masked < id_remap.size() && id_remap[masked] != 0xFFFFFFFF)
                    id = id_remap[masked] | flags;
            }
            std::sort(ids.begin(), ids.end());
        }
    };

    auto write_entries_cells = [](const std::string& cells_path, const std::string& entries_path,
                                   const std::unordered_map<uint64_t, std::vector<uint32_t>>& cell_map,
                                   size_t cell_stride)
    {
        std::vector<uint64_t> sorted_cells;
        for (auto& [id, _] : cell_map) sorted_cells.push_back(id);
        std::sort(sorted_cells.begin(), sorted_cells.end());

        std::vector<char> entries_buf;
        std::unordered_map<uint64_t, uint32_t> offsets;
        for (uint64_t cid : sorted_cells) {
            auto it = cell_map.find(cid);
            if (it == cell_map.end() || it->second.empty()) continue;
            offsets[cid] = static_cast<uint32_t>(entries_buf.size());
            uint16_t count = static_cast<uint16_t>(it->second.size());
            entries_buf.insert(entries_buf.end(), (char*)&count, (char*)&count + 2);
            entries_buf.insert(entries_buf.end(), (char*)it->second.data(),
                              (char*)it->second.data() + it->second.size() * 4);
        }
        write_file(entries_path, entries_buf);

        uint32_t no_data = 0xFFFFFFFF;
        std::vector<char> cells_buf;
        for (uint64_t cid : sorted_cells) {
            cells_buf.insert(cells_buf.end(), (char*)&cid, (char*)&cid + 8);
            auto it = offsets.find(cid);
            uint32_t off = (it != offsets.end()) ? it->second : no_data;
            cells_buf.insert(cells_buf.end(), (char*)&off, (char*)&off + 4);
        }
        write_file(cells_path, cells_buf);
    };

    // Geo cells: parse old, remap, merge with new cell set
    std::cerr << "  Remapping geo entries..." << std::endl;
    {
        auto old_geo = read_file(old_dir + "/geo_cells.bin");
        auto old_se = read_file(old_dir + "/street_entries.bin");
        auto old_ae = read_file(old_dir + "/addr_entries.bin");
        auto old_ie = read_file(old_dir + "/interp_entries.bin");

        auto new_geo = read_file(new_dir + "/geo_cells.bin");
        auto new_se = read_file(new_dir + "/street_entries.bin");
        auto new_ae = read_file(new_dir + "/addr_entries.bin");
        auto new_ie = read_file(new_dir + "/interp_entries.bin");

        // Parse old entries
        auto sc = parse_entries(old_geo, 20, 8, old_se);
        auto ac = parse_entries(old_geo, 20, 12, old_ae);
        auto ic = parse_entries(old_geo, 20, 16, old_ie);

        // Parse new entries (for cells that are new/changed)
        auto new_sc = parse_entries(new_geo, 20, 8, new_se);
        auto new_ac = parse_entries(new_geo, 20, 12, new_ae);
        auto new_ic = parse_entries(new_geo, 20, 16, new_ie);

        // Remap old IDs
        remap_ids(sc, way_remap);
        remap_ids(ac, addr_remap);
        remap_ids(ic, interp_remap);

        // Merge: start with remapped old, overlay with new for changed/added cells
        // For cells that exist in new but not old: add from new
        // For cells that exist in old but not new: remove
        for (auto& [cid, ids] : new_sc) sc[cid] = ids;
        for (auto& [cid, ids] : new_ac) ac[cid] = ids;
        for (auto& [cid, ids] : new_ic) ic[cid] = ids;

        // Collect all cells from new build
        std::unordered_map<uint64_t, bool> new_cells;
        size_t nn = new_geo.size() / 20;
        for (size_t i = 0; i < nn; i++) {
            uint64_t cid; memcpy(&cid, new_geo.data() + i * 20, 8);
            new_cells[cid] = true;
        }
        // Remove cells not in new
        for (auto it = sc.begin(); it != sc.end(); )
            new_cells.count(it->first) ? ++it : it = sc.erase(it);
        for (auto it = ac.begin(); it != ac.end(); )
            new_cells.count(it->first) ? ++it : it = ac.erase(it);
        for (auto it = ic.begin(); it != ic.end(); )
            new_cells.count(it->first) ? ++it : it = ic.erase(it);

        // Write merged entries + geo_cells
        // (This produces files almost identical to new build's entries)
        auto write_geo = [&](const std::string& dir,
                              const std::unordered_map<uint64_t, std::vector<uint32_t>>& s,
                              const std::unordered_map<uint64_t, std::vector<uint32_t>>& a,
                              const std::unordered_map<uint64_t, std::vector<uint32_t>>& ip) {
            // Collect all cells
            std::vector<uint64_t> all_cells;
            for (auto& [id, _] : new_cells) all_cells.push_back(id);
            std::sort(all_cells.begin(), all_cells.end());

            auto write_ent = [&](const std::string& path,
                                  const std::unordered_map<uint64_t, std::vector<uint32_t>>& cm)
                -> std::unordered_map<uint64_t, uint32_t>
            {
                std::vector<char> buf;
                std::unordered_map<uint64_t, uint32_t> offsets;
                for (uint64_t cid : all_cells) {
                    auto it = cm.find(cid);
                    if (it == cm.end() || it->second.empty()) continue;
                    offsets[cid] = static_cast<uint32_t>(buf.size());
                    uint16_t count = static_cast<uint16_t>(it->second.size());
                    buf.insert(buf.end(), (char*)&count, (char*)&count + 2);
                    buf.insert(buf.end(), (char*)it->second.data(),
                              (char*)it->second.data() + it->second.size() * 4);
                }
                write_file(path, buf);
                return offsets;
            };

            auto so = write_ent(dir + "/street_entries.bin", s);
            auto ao = write_ent(dir + "/addr_entries.bin", a);
            auto io = write_ent(dir + "/interp_entries.bin", ip);

            uint32_t no_data = 0xFFFFFFFF;
            std::vector<char> buf;
            for (uint64_t cid : all_cells) {
                buf.insert(buf.end(), (char*)&cid, (char*)&cid + 8);
                auto g = [&](const auto& m) -> uint32_t {
                    auto it = m.find(cid); return (it != m.end()) ? it->second : no_data;
                };
                uint32_t sv = g(so), av = g(ao), iv = g(io);
                buf.insert(buf.end(), (char*)&sv, (char*)&sv + 4);
                buf.insert(buf.end(), (char*)&av, (char*)&av + 4);
                buf.insert(buf.end(), (char*)&iv, (char*)&iv + 4);
            }
            write_file(dir + "/geo_cells.bin", buf);
        };

        write_geo(tmpdir, sc, ac, ic);
    }

    // Admin cells: parse, remap, rebuild
    std::cerr << "  Remapping admin entries..." << std::endl;
    {
        auto old_ac = read_file(old_dir + "/admin_cells.bin");
        auto old_ae = read_file(old_dir + "/admin_entries.bin");
        auto new_ac = read_file(new_dir + "/admin_cells.bin");
        auto new_ae = read_file(new_dir + "/admin_entries.bin");

        auto cells = parse_entries(old_ac, 12, 8, old_ae);
        auto new_cells_map = parse_entries(new_ac, 12, 8, new_ae);
        remap_ids(cells, admin_remap, true);

        // Merge with new
        for (auto& [cid, ids] : new_cells_map) cells[cid] = ids;
        // Remove cells not in new
        std::unordered_map<uint64_t, bool> new_cell_set;
        size_t nn = new_ac.size() / 12;
        for (size_t i = 0; i < nn; i++) {
            uint64_t cid; memcpy(&cid, new_ac.data() + i * 12, 8);
            new_cell_set[cid] = true;
        }
        for (auto it = cells.begin(); it != cells.end(); )
            new_cell_set.count(it->first) ? ++it : it = cells.erase(it);

        write_entries_cells(tmpdir + "/admin_cells.bin", tmpdir + "/admin_entries.bin", cells, 12);
    }
}

// --- Write helpers ---
static void write_val(std::ofstream& f, const void* data, size_t size) {
    f.write(reinterpret_cast<const char*>(data), size);
}

int main(int argc, char* argv[]) {
    if (argc < 5 || std::string(argv[3]) != "-o") {
        std::cerr << "Usage: geocoder-diff <old-dir> <new-dir> -o <patch-file>" << std::endl;
        return 1;
    }
    std::string old_dir = argv[1], new_dir = argv[2], patch_path = argv[4];
    std::string tmpdir = "/tmp/geocoder-diff-" + std::to_string(getpid());
    ensure_dir(tmpdir);

    // Build string remap
    std::cerr << "Building string remap..." << std::endl;
    auto old_strings = read_file(old_dir + "/strings.bin");
    auto new_strings = read_file(new_dir + "/strings.bin");
    auto str_remap = build_string_remap(old_strings, new_strings);
    std::cerr << "  " << str_remap.size() << " strings mapped" << std::endl;

    // Detect struct strides
    auto detect = [](const std::string& path, std::vector<size_t> cs) -> size_t {
        auto d = read_file(path);
        for (size_t s : cs) if (d.size() % s == 0 && d.size() > 0) return s;
        return cs[0];
    };
    size_t way_stride = detect(old_dir + "/street_ways.bin", {12, 9});
    size_t interp_stride = detect(old_dir + "/interp_ways.bin", {20, 18});
    size_t admin_stride = detect(old_dir + "/admin_polygons.bin", {24, 20, 19});

    // Build record ID remaps (requires loading data + coordinate files)
    std::cerr << "Building record ID remaps..." << std::endl;
    std::vector<uint32_t> addr_id_remap, way_id_remap, interp_id_remap, admin_id_remap;
    {
        // addr_points: string-remap old, then match by bytes
        auto old_ap = read_file(old_dir + "/addr_points.bin");
        remap_addr_points(old_ap, str_remap);
        auto new_ap = read_file(new_dir + "/addr_points.bin");
        addr_id_remap = match_addr_points(old_ap, new_ap);
        write_file(tmpdir + "/addr_points.bin", old_ap);
    }
    {
        // street_ways: string-remap + content match (fixes node_offset too)
        auto old_w = read_file(old_dir + "/street_ways.bin");
        remap_field(old_w, way_stride, way_stride == 12 ? 8 : 5, str_remap);
        auto old_n = read_file(old_dir + "/street_nodes.bin");
        auto new_w = read_file(new_dir + "/street_ways.bin");
        auto new_n = read_file(new_dir + "/street_nodes.bin");
        way_id_remap = match_ways(old_w, old_n, new_w, new_n, way_stride);
        write_file(tmpdir + "/street_ways.bin", old_w);
        write_file(tmpdir + "/street_nodes.bin", new_n); // use new nodes (offsets now match)
    }
    {
        auto old_i = read_file(old_dir + "/interp_ways.bin");
        remap_field(old_i, interp_stride, interp_stride >= 20 ? 8 : 5, str_remap);
        auto old_n = read_file(old_dir + "/interp_nodes.bin");
        auto new_i = read_file(new_dir + "/interp_ways.bin");
        auto new_n = read_file(new_dir + "/interp_nodes.bin");
        interp_id_remap = match_interps(old_i, old_n, new_i, new_n, interp_stride);
        write_file(tmpdir + "/interp_ways.bin", old_i);
        write_file(tmpdir + "/interp_nodes.bin", new_n);
    }
    {
        auto old_p = read_file(old_dir + "/admin_polygons.bin");
        remap_field(old_p, admin_stride, 8, str_remap);
        auto old_v = read_file(old_dir + "/admin_vertices.bin");
        auto new_p = read_file(new_dir + "/admin_polygons.bin");
        auto new_v = read_file(new_dir + "/admin_vertices.bin");
        admin_id_remap = match_admin(old_p, old_v, new_p, new_v, admin_stride);
        write_file(tmpdir + "/admin_polygons.bin", old_p);
        write_file(tmpdir + "/admin_vertices.bin", new_v);
    }

    // Rebuild entry/cell files with remapped IDs
    remap_and_rebuild_entries(old_dir, new_dir, tmpdir,
                              way_id_remap, addr_id_remap, interp_id_remap, admin_id_remap);

    // Open patch file
    std::ofstream pf(patch_path, std::ios::binary);
    pf.write(GCPATCH_MAGIC, 8);
    uint32_t ver = GCPATCH_VERSION, flags = 0;
    write_val(pf, &ver, 4); write_val(pf, &flags, 4);

    // Write string remap
    {
        uint32_t marker = 0xFFFFFFFE;
        write_val(pf, &marker, 4);
        std::vector<std::pair<uint32_t,uint32_t>> entries;
        size_t pos = 0;
        while (pos < old_strings.size()) {
            uint32_t old_off = static_cast<uint32_t>(pos);
            auto it = str_remap.find(old_off);
            entries.push_back({old_off, (it != str_remap.end()) ? it->second : old_off});
            pos += strlen(old_strings.data() + pos) + 1;
        }
        uint32_t count = static_cast<uint32_t>(entries.size());
        write_val(pf, &count, 4);
        for (auto& [o, n] : entries) { write_val(pf, &o, 4); write_val(pf, &n, 4); }
        std::cerr << "  Remap: " << count << " entries" << std::endl;
    }

    // Write offset fixup tables for ways/interps/admin (node_offset/vertex_offset)
    {
        auto write_fixups = [&](PatchFileId id, const std::string& name,
                                 const std::vector<uint32_t>& id_remap, size_t stride) {
            auto new_data = read_file(new_dir + "/" + name);
            uint32_t marker = FIXUP_MARKER, fid = static_cast<uint32_t>(id);
            uint32_t st = static_cast<uint32_t>(stride);
            std::vector<std::pair<uint32_t, uint32_t>> fixups;
            for (uint32_t i = 0; i < id_remap.size(); i++) {
                if (id_remap[i] != 0xFFFFFFFF) {
                    uint32_t new_val;
                    memcpy(&new_val, new_data.data() + id_remap[i] * stride, 4);
                    fixups.push_back({i, new_val});
                }
            }
            write_val(pf, &marker, 4); write_val(pf, &fid, 4);
            write_val(pf, &st, 4);
            uint32_t count = static_cast<uint32_t>(fixups.size());
            write_val(pf, &count, 4);
            for (auto& [idx, val] : fixups) { write_val(pf, &idx, 4); write_val(pf, &val, 4); }
            std::cerr << "  fixup " << name << ": " << count << " entries" << std::endl;
        };
        write_fixups(PatchFileId::STREET_WAYS, "street_ways.bin", way_id_remap, way_stride);
        write_fixups(PatchFileId::INTERP_WAYS, "interp_ways.bin", interp_id_remap, interp_stride);
        write_fixups(PatchFileId::ADMIN_POLYGONS, "admin_polygons.bin", admin_id_remap, admin_stride);
    }

    // Write record ID remap tables (for entry file reconstruction in patch tool)
    // Marker: 0xFFFFFFFC, file_id, count, [(old_id, new_id)] pairs
    {
        auto write_id_remap = [&](PatchFileId id, const std::vector<uint32_t>& remap) {
            uint32_t marker = 0xFFFFFFFC, fid = static_cast<uint32_t>(id);
            std::vector<std::pair<uint32_t,uint32_t>> pairs;
            for (uint32_t i = 0; i < remap.size(); i++)
                if (remap[i] != 0xFFFFFFFF) pairs.push_back({i, remap[i]});
            write_val(pf, &marker, 4); write_val(pf, &fid, 4);
            uint32_t count = static_cast<uint32_t>(pairs.size());
            write_val(pf, &count, 4);
            for (auto& [o, n] : pairs) { write_val(pf, &o, 4); write_val(pf, &n, 4); }
            std::cerr << "  id_remap file " << fid << ": " << count << " entries (" << count * 8 << " bytes)" << std::endl;
        };
        write_id_remap(PatchFileId::STREET_WAYS, way_id_remap);
        write_id_remap(PatchFileId::ADDR_POINTS, addr_id_remap);
        write_id_remap(PatchFileId::INTERP_WAYS, interp_id_remap);
        write_id_remap(PatchFileId::ADMIN_POLYGONS, admin_id_remap);
    }

    // Single-stage diffs: remapped_old → new (zstd --patch-from on temp files)
    auto diff_file = [&](PatchFileId id, const std::string& name, bool use_old_as_ref = false) {
        std::cerr << "  " << name << ": ";
        std::string ref;
        if (use_old_as_ref) {
            ref = old_dir + "/" + name;
        } else {
            ref = tmpdir + "/" + name;
            if (read_file(ref).empty()) ref = old_dir + "/" + name;
        }
        std::string tgt = new_dir + "/" + name;
        std::string zst = tmpdir + "/" + name + ".zst";
        system(("zstd --patch-from='" + ref + "' '" + tgt + "' -o '" + zst + "' -f --quiet 2>/dev/null").c_str());
        auto zst_data = read_file(zst);
        auto old_data = read_file(old_dir + "/" + name);
        auto new_data = read_file(tgt);

        uint32_t fid = static_cast<uint32_t>(id), enc = static_cast<uint32_t>(PatchEncoding::ZSTD_DELTA);
        uint64_t os = old_data.size(), ns = new_data.size(), ds = zst_data.size();
        write_val(pf, &fid, 4); write_val(pf, &enc, 4);
        write_val(pf, &os, 8); write_val(pf, &ns, 8); write_val(pf, &ds, 8);
        pf.write(zst_data.data(), zst_data.size());

        double pct = ns > 0 ? ds * 100.0 / ns : 0;
        std::cerr << ds << " bytes (" << std::fixed << std::setprecision(2) << pct << "%)" << std::endl;
        remove(zst.c_str());
    };

    // Data files with string remap + fixups: use remapped temp as ref
    diff_file(PatchFileId::ADDR_POINTS, "addr_points.bin");
    diff_file(PatchFileId::STREET_WAYS, "street_ways.bin");
    diff_file(PatchFileId::INTERP_WAYS, "interp_ways.bin");
    diff_file(PatchFileId::ADMIN_POLYGONS, "admin_polygons.bin");
    // Coord files: use old as ref (no remap needed)
    diff_file(PatchFileId::STRINGS, "strings.bin", true);
    diff_file(PatchFileId::STREET_NODES, "street_nodes.bin", true);
    diff_file(PatchFileId::INTERP_NODES, "interp_nodes.bin", true);
    diff_file(PatchFileId::ADMIN_VERTICES, "admin_vertices.bin", true);
    // Entry/cell files: use rebuilt temp as ref (has remapped IDs)
    diff_file(PatchFileId::GEO_CELLS, "geo_cells.bin");
    diff_file(PatchFileId::STREET_ENTRIES, "street_entries.bin");
    diff_file(PatchFileId::ADDR_ENTRIES, "addr_entries.bin");
    diff_file(PatchFileId::INTERP_ENTRIES, "interp_entries.bin");
    diff_file(PatchFileId::ADMIN_CELLS, "admin_cells.bin");
    diff_file(PatchFileId::ADMIN_ENTRIES, "admin_entries.bin");

    uint32_t end = 0xFFFFFFFF;
    write_val(pf, &end, 4);

    std::string rm_cmd = "rm -rf '" + tmpdir + "'";
    system(rm_cmd.c_str());

    auto total = pf.tellp();
    std::cerr << "\nTotal patch: " << total << " bytes (" << total / 1024 / 1024 << " MiB)" << std::endl;
    return 0;
}

-    // Entry/cell files: use rebuilt temp as ref (has remapped IDs)

-    diff_file(PatchFileId::GEO_CELLS, "geo_cells.bin");

-    diff_file(PatchFileId::STREET_ENTRIES, "street_entries.bin");

-    diff_file(PatchFileId::ADDR_ENTRIES, "addr_entries.bin");

-    diff_file(PatchFileId::INTERP_ENTRIES, "interp_entries.bin");

-    diff_file(PatchFileId::ADMIN_CELLS, "admin_cells.bin");

-    diff_file(PatchFileId::ADMIN_ENTRIES, "admin_entries.bin");

+    // Entry/cell files: use old directly (rebuilt entries differ subtly)

+    diff_file(PatchFileId::GEO_CELLS, "geo_cells.bin", true);

+    diff_file(PatchFileId::STREET_ENTRIES, "street_entries.bin", true);

+    diff_file(PatchFileId::ADDR_ENTRIES, "addr_entries.bin", true);

+    diff_file(PatchFileId::INTERP_ENTRIES, "interp_entries.bin", true);

+    diff_file(PatchFileId::ADMIN_CELLS, "admin_cells.bin", true);

+    diff_file(PatchFileId::ADMIN_ENTRIES, "admin_entries.bin", true);


default-src 'none'; frame-ancestors 'none'

_cfuvid=kU8a_3GfCuHxRxssg8kg3iBLgu_bXRMP7Fd3Jv5rcCQ-1774615248.090567-1.0.1.1-wRsPXrAmS.Ewg80Kec4czLtEFFkavL2RSmnppnSI_d0; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com

Overloaded. https://docs.claude.com/en/api/errors


Bash

cmake --build build -j$(nproc) --target geocoder-diff --target geocoder-patch 2>&1 | tail -3 && sshpass -p 'elon-is-insane' scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" /root/traccar-geocoder/builder/build/geocoder-diff /root/traccar-geocoder/builder/build/geocoder-patch michtest@100.113.88.121:~/ 2>&1 && sshpass -p 'elon-is-insane' ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" michtest@100.113.88.121 '
rm -f /home/michtest/test7.gcpatch
/home/michtest/geocoder-diff /home/michtest/det-A /home/michtest/det-new -o /home/michtest/test7.gcpatch 2>&1
echo "Patch: $(numfmt --to=iec $(stat -c%s /home/michtest/test7.gcpatch))"
rm -rf /home/michtest/patched7
/home/michtest/geocoder-patch /home/michtest/det-A /home/michtest/test7.gcpatch -o /home/michtest/patched7 2>&1
echo ""
all_match=true
for f in /home/michtest/det-new/*.bin; do
    b=$(basename $f); p=/home/michtest/patched7/$b
    [ -f "$p" ] && cmp -s "$f" "$p" && echo "  $b: MATCH" || { echo "  $b: FAIL"; all_match=false; }
done
$all_match && echo "ALL FILES MATCH" || echo "SOME DIFFER"
' 2>&1

Final working test


[100%] Linking CXX executable geocoder-diff
[100%] Built target geocoder-diff
[100%] Built target geocoder-patch
Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
Building string remap...
  4980078 strings mapped
Building record ID remaps...
    addr matched=85825938/85891830 new=164173
    ways matched=19372891/19452480 new=95957
    interps matched=1016/16785 new=15755
    admin matched=449642/450907 new=1222
  Remapping geo entries...
  Remapping admin entries...
  Remap: 4982052 entries
  fixup street_ways.bin: 19372891 entries
  fixup interp_ways.bin: 1016 entries
  fixup admin_polygons.bin: 449642 entries
  id_remap file 1: 19372891 entries (154983128 bytes)
  id_remap file 3: 85825938 entries (686607504 bytes)
  id_remap file 4: 1016 entries (8128 bytes)
  id_remap file 6: 449642 entries (3597136 bytes)
  addr_points.bin: 3770551 bytes (0.27%)
  street_ways.bin: 1515482 bytes (0.65%)
  interp_ways.bin: 66381 bytes (19.79%)
  admin_polygons.bin: 39775 bytes (0.37%)
  strings.bin: 71309 bytes (0.09%)
  street_nodes.bin: 6727404 bytes (0.47%)
  interp_nodes.bin: 1228 bytes (0.17%)
  admin_vertices.bin: 535915 bytes (0.18%)
  geo_cells.bin: 396408051 bytes (23.68%)
  street_entries.bin: 179530212 bytes (30.61%)
  addr_entries.bin: 312948034 bytes (79.23%)
  interp_entries.bin: 60392 bytes (37.89%)
  admin_cells.bin: 469093 bytes (27.72%)
  admin_entries.bin: 2485930 bytes (40.60%)

Total patch: 1948271033 bytes (1858 MiB)
Patch: 1.9G
Loaded 4980054 string remap entries
Loaded 19372891 fixups for file 1
Loaded 1016 fixups for file 4
Loaded 449642 fixups for file 6
Loaded 19372891 ID remaps for file 1
Loaded 85825938 ID remaps for file 3
Loaded 1016 ID remaps for file 4
Loaded 449642 ID remaps for file 6
Rebuilt 6 entry/cell files from ID remaps
  addr_points.bin: 1375841776 bytes
  street_ways.bin: 233626176 bytes
  interp_ways.bin: 335424 bytes
  admin_polygons.bin: 10820736 bytes
  strings.bin: 82573397 bytes
  street_nodes.bin: 1445600360 bytes
  interp_nodes.bin: 725184 bytes
  admin_vertices.bin: 291061192 bytes
  geo_cells.bin: 1674295440 bytes
FAILED: street_entries.bin

  addr_entries.bin: FAIL
  addr_points.bin: MATCH
  admin_cells.bin: FAIL
  admin_entries.bin: FAIL
  admin_polygons.bin: MATCH
  admin_vertices.bin: MATCH
  geo_cells.bin: MATCH
  interp_entries.bin: FAIL
  interp_nodes.bin: MATCH
  interp_ways.bin: MATCH
  street_entries.bin: FAIL
  street_nodes.bin: MATCH
  street_ways.bin: MATCH
  strings.bin: MATCH
SOME DIFFER


geo_cells MATCHES but entries fail. The patch tool rebuilds entries from ID remaps (which produces slightly different content than new entries). The diff used old→new directly for entries (which is correct for single-stage), but the patch tool used rebuilt entries as reference (which don't match).

The fix: for entry files, the patch tool should NOT use rebuilt refs — just use old files directly (same as what the diff tool uses as reference). Let me fix:


   173→        auto& rm = id_remaps[fid];
   174→        for (uint32_t i = 0; i < count; i++) {
   175→            uint32_t old_id, new_id;
   176→            pf.read(reinterpret_cast<char*>(&old_id), 4);
   177→            pf.read(reinterpret_cast<char*>(&new_id), 4);
   178→            rm[old_id] = new_id;
   179→        }
   180→        std::cerr << "Loaded " << count << " ID remaps for file " << fid << std::endl;
   181→    }
   182→
   183→    // Helper: rebuild entry + cell files using ID remap
   184→    auto rebuild_entries = [&](const std::string& cells_file, const std::string& entries_file,
   185→                                size_t cell_stride, size_t offset_pos,
   186→                                const std::unordered_map<uint32_t,uint32_t>& id_rm, bool has_flags)
   187→        -> std::pair<std::vector<char>, std::vector<char>> // (entries_data, cells_data)

        auto& rm = id_remaps[fid];
        for (uint32_t i = 0; i < count; i++) {
            uint32_t old_id, new_id;
            pf.read(reinterpret_cast<char*>(&old_id), 4);
            pf.read(reinterpret_cast<char*>(&new_id), 4);
            rm[old_id] = new_id;
        }
        std::cerr << "Loaded " << count << " ID remaps for file " << fid << std::endl;
    }

    // Helper: rebuild entry + cell files using ID remap
    auto rebuild_entries = [&](const std::string& cells_file, const std::string& entries_file,
                                size_t cell_stride, size_t offset_pos,
                                const std::unordered_map<uint32_t,uint32_t>& id_rm, bool has_flags)
        -> std::pair<std::vector<char>, std::vector<char>> // (entries_data, cells_data)


The issue: the patch tool builds `rebuilt_refs` for entry/cell files, and the section processing code uses them. But the diff created the zstd delta against OLD files (not rebuilt). The patch needs to use OLD files too.

Let me disable the rebuilt_refs for entry files since the diff uses old→new for them:


306:        rebuilt_refs["street_entries.bin"] = write_rebuilt("street_entries.bin", sc);
307:        rebuilt_refs["addr_entries.bin"] = write_rebuilt("addr_entries.bin", ac);
308:        rebuilt_refs["interp_entries.bin"] = write_rebuilt("interp_entries.bin", ic);
348:            rebuilt_refs["geo_cells.bin"] = path;
359:            rebuilt_refs["admin_entries.bin"] = ae_path;
360:            rebuilt_refs["admin_cells.bin"] = ac_path;


The simplest fix: don't create rebuilt_refs for entry files (only keep geo_cells since it matches):


Edit

        rebuilt_refs["street_entries.bin"] = write_rebuilt("street_entries.bin", sc);
        rebuilt_refs["addr_entries.bin"] = write_rebuilt("addr_entries.bin", ac);
        rebuilt_refs["interp_entries.bin"] = write_rebuilt("interp_entries.bin", ic);

        // Entry files: don't use rebuilt refs (diff uses old→new directly)
        // Only geo_cells uses rebuilt ref (proven to match byte-identical)
        write_rebuilt("street_entries.bin", sc); // write for geo_cells offset calculation
        write_rebuilt("addr_entries.bin", ac);
        write_rebuilt("interp_entries.bin", ic);


The file /root/traccar-geocoder/builder/tools/geocoder_patch.cpp has been updated successfully.

        // Entry files: don't use rebuilt refs (diff uses old→new directly)
        // Only geo_cells uses rebuilt ref (proven to match byte-identical)
        write_rebuilt("street_entries.bin", sc); // write for geo_cells offset calculation
        write_rebuilt("addr_entries.bin", ac);
        write_rebuilt("interp_entries.bin", ic);

// geocoder-patch: Apply a .gcpatch to a geocoder index directory.
//
// For each file: apply string remap to old, write temp, run zstd -d --patch-from.
//
// Usage: geocoder-patch <current-dir> <patch-file> -o <output-dir>

#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <string>
#include <unordered_map>
#include <vector>

#include <unistd.h>
#include "patch_format.h"

// --- String remap application ---

static void remap_addr_points(std::vector<char>& data,
                                const std::unordered_map<uint32_t,uint32_t>& rm) {
    for (size_t i = 0; i + 16 <= data.size(); i += 16) {
        for (size_t off : {8, 12}) {
            uint32_t v; memcpy(&v, data.data() + i + off, 4);
            auto it = rm.find(v);
            if (it != rm.end()) memcpy(data.data() + i + off, &it->second, 4);
        }
    }
}

static void remap_field(std::vector<char>& data, size_t stride, size_t field_off,
                          const std::unordered_map<uint32_t,uint32_t>& rm) {
    for (size_t i = 0; i + stride <= data.size(); i += stride) {
        uint32_t v; memcpy(&v, data.data() + i + field_off, 4);
        auto it = rm.find(v);
        if (it != rm.end()) memcpy(data.data() + i + field_off, &it->second, 4);
    }
}

int main(int argc, char* argv[]) {
    if (argc < 5 || std::string(argv[3]) != "-o") {
        std::cerr << "Usage: geocoder-patch <current-dir> <patch-file> -o <output-dir>" << std::endl;
        return 1;
    }
    std::string cur_dir = argv[1], patch_path = argv[2], out_dir = argv[4];
    ensure_dir(out_dir);

    std::string tmpdir = "/tmp/geocoder-patch-" + std::to_string(getpid());
    ensure_dir(tmpdir);

    std::ifstream pf(patch_path, std::ios::binary);
    if (!pf) { std::cerr << "Cannot open " << patch_path << std::endl; return 1; }

    // Read header
    char magic[8]; pf.read(magic, 8);
    if (memcmp(magic, GCPATCH_MAGIC, 8) != 0) {
        std::cerr << "Invalid patch file" << std::endl; return 1;
    }
    uint32_t version, flags;
    pf.read(reinterpret_cast<char*>(&version), 4);
    pf.read(reinterpret_cast<char*>(&flags), 4);
    if (version != GCPATCH_VERSION) {
        std::cerr << "Unsupported version " << version << std::endl; return 1;
    }

    // Read string remap
    std::unordered_map<uint32_t, uint32_t> str_remap;
    {
        uint32_t section_id; pf.read(reinterpret_cast<char*>(&section_id), 4);
        if (section_id == 0xFFFFFFFE) {
            uint32_t count; pf.read(reinterpret_cast<char*>(&count), 4);
            for (uint32_t i = 0; i < count; i++) {
                uint32_t old_off, new_off;
                pf.read(reinterpret_cast<char*>(&old_off), 4);
                pf.read(reinterpret_cast<char*>(&new_off), 4);
                if (old_off != new_off) str_remap[old_off] = new_off;
            }
            std::cerr << "Loaded " << str_remap.size() << " string remap entries" << std::endl;
        }
    }

    // Read offset fixup tables
    struct Fixup { uint32_t record_idx; uint32_t new_value; };
    std::unordered_map<uint32_t, std::vector<Fixup>> fixup_tables; // file_id → fixups
    std::unordered_map<uint32_t, uint32_t> fixup_strides; // file_id → stride
    while (pf) {
        uint32_t marker; pf.read(reinterpret_cast<char*>(&marker), 4);
        if (marker != FIXUP_MARKER) {
            pf.seekg(-4, std::ios::cur);
            break;
        }
        uint32_t fid, stride, count;
        pf.read(reinterpret_cast<char*>(&fid), 4);
        pf.read(reinterpret_cast<char*>(&stride), 4);
        pf.read(reinterpret_cast<char*>(&count), 4);
        auto& vec = fixup_tables[fid];
        fixup_strides[fid] = stride;
        vec.resize(count);
        for (uint32_t i = 0; i < count; i++) {
            pf.read(reinterpret_cast<char*>(&vec[i].record_idx), 4);
            pf.read(reinterpret_cast<char*>(&vec[i].new_value), 4);
        }
        std::cerr << "Loaded " << count << " fixups for file " << fid << std::endl;
    }

    // Detect struct strides from current files
    auto detect_stride = [&](const std::string& name, std::vector<size_t> cs) -> size_t {
        auto d = read_file(cur_dir + "/" + name);
        for (size_t s : cs) if (d.size() % s == 0 && d.size() > 0) return s;
        return cs[0];
    };
    size_t way_stride = detect_stride("street_ways.bin", {12, 9});
    size_t interp_stride = detect_stride("interp_ways.bin", {20, 18});
    size_t admin_stride = detect_stride("admin_polygons.bin", {24, 20, 19});

    // Helper: apply string remap to old data file
    auto apply_str_remap = [&](std::vector<char>& data, uint32_t file_id) {
        if (str_remap.empty()) return;
        if (file_id == (uint32_t)PatchFileId::ADDR_POINTS) {
            for (size_t i = 0; i + 16 <= data.size(); i += 16)
                for (size_t off : {8, 12}) {
                    uint32_t v; memcpy(&v, data.data() + i + off, 4);
                    auto it = str_remap.find(v);
                    if (it != str_remap.end()) memcpy(data.data() + i + off, &it->second, 4);
                }
        } else if (file_id == (uint32_t)PatchFileId::STREET_WAYS) {
            size_t name_off = (way_stride == 12) ? 8 : 5;
            for (size_t i = 0; i + way_stride <= data.size(); i += way_stride) {
                uint32_t v; memcpy(&v, data.data() + i + name_off, 4);
                auto it = str_remap.find(v);
                if (it != str_remap.end()) memcpy(data.data() + i + name_off, &it->second, 4);
            }
        } else if (file_id == (uint32_t)PatchFileId::INTERP_WAYS) {
            size_t soff = (interp_stride >= 20) ? 8 : 5;
            for (size_t i = 0; i + interp_stride <= data.size(); i += interp_stride) {
                uint32_t v; memcpy(&v, data.data() + i + soff, 4);
                auto it = str_remap.find(v);
                if (it != str_remap.end()) memcpy(data.data() + i + soff, &it->second, 4);
            }
        } else if (file_id == (uint32_t)PatchFileId::ADMIN_POLYGONS) {
            for (size_t i = 0; i + admin_stride <= data.size(); i += admin_stride) {
                uint32_t v; memcpy(&v, data.data() + i + 8, 4);
                auto it = str_remap.find(v);
                if (it != str_remap.end()) memcpy(data.data() + i + 8, &it->second, 4);
            }
        }
    };

    // Helper: apply offset fixups
    auto apply_fixups = [&](std::vector<char>& data, uint32_t file_id) {
        auto it = fixup_tables.find(file_id);
        if (it == fixup_tables.end()) return;
        uint32_t stride = fixup_strides[file_id];
        for (auto& f : it->second) {
            size_t pos = (size_t)f.record_idx * stride;
            if (pos + 4 <= data.size())
                memcpy(data.data() + pos, &f.new_value, 4);
        }
    };

    // Read ID remap tables
    std::unordered_map<uint32_t, std::unordered_map<uint32_t,uint32_t>> id_remaps; // file_id → (old→new)
    while (pf) {
        uint32_t marker; pf.read(reinterpret_cast<char*>(&marker), 4);
        if (marker != 0xFFFFFFFC) {
            pf.seekg(-4, std::ios::cur);
            break;
        }
        uint32_t fid, count;
        pf.read(reinterpret_cast<char*>(&fid), 4);
        pf.read(reinterpret_cast<char*>(&count), 4);
        auto& rm = id_remaps[fid];
        for (uint32_t i = 0; i < count; i++) {
            uint32_t old_id, new_id;
            pf.read(reinterpret_cast<char*>(&old_id), 4);
            pf.read(reinterpret_cast<char*>(&new_id), 4);
            rm[old_id] = new_id;
        }
        std::cerr << "Loaded " << count << " ID remaps for file " << fid << std::endl;
    }

    // Helper: rebuild entry + cell files using ID remap
    auto rebuild_entries = [&](const std::string& cells_file, const std::string& entries_file,
                                size_t cell_stride, size_t offset_pos,
                                const std::unordered_map<uint32_t,uint32_t>& id_rm, bool has_flags)
        -> std::pair<std::vector<char>, std::vector<char>> // (entries_data, cells_data)
    {
        auto old_cells = read_file(cur_dir + "/" + cells_file);
        auto old_entries = read_file(cur_dir + "/" + entries_file);
        size_t n_cells = old_cells.size() / cell_stride;

        // Parse old entries, remap IDs
        struct CellEntry { uint64_t cell_id; std::vector<uint32_t> ids; };
        std::vector<CellEntry> parsed;
        for (size_t i = 0; i < n_cells; i++) {
            uint64_t cid; uint32_t off;
            memcpy(&cid, old_cells.data() + i * cell_stride, 8);
            memcpy(&off, old_cells.data() + i * cell_stride + offset_pos, 4);
            CellEntry ce; ce.cell_id = cid;
            if (off != 0xFFFFFFFF && off + 2 <= old_entries.size()) {
                uint16_t count; memcpy(&count, old_entries.data() + off, 2);
                if (off + 2 + count * 4 <= old_entries.size()) {
                    for (uint16_t j = 0; j < count; j++) {
                        uint32_t id; memcpy(&id, old_entries.data() + off + 2 + j * 4, 4);
                        uint32_t flags = has_flags ? (id & 0x80000000u) : 0;
                        uint32_t masked = id & 0x7FFFFFFFu;
                        auto it = id_rm.find(masked);
                        if (it != id_rm.end())
                            ce.ids.push_back(it->second | flags);
                        else
                            ce.ids.push_back(id); // keep unmapped IDs as-is
                    }
                }
            }
            std::sort(ce.ids.begin(), ce.ids.end());
            parsed.push_back(std::move(ce));
        }

        // Rebuild entries + cells
        std::vector<char> new_entries_buf, new_cells_buf;
        uint32_t no_data = 0xFFFFFFFF;
        for (auto& ce : parsed) {
            new_cells_buf.insert(new_cells_buf.end(), (char*)&ce.cell_id, (char*)&ce.cell_id + 8);
            if (ce.ids.empty()) {
                new_cells_buf.insert(new_cells_buf.end(), (char*)&no_data, (char*)&no_data + 4);
            } else {
                uint32_t off = static_cast<uint32_t>(new_entries_buf.size());
                new_cells_buf.insert(new_cells_buf.end(), (char*)&off, (char*)&off + 4);
                uint16_t count = static_cast<uint16_t>(ce.ids.size());
                new_entries_buf.insert(new_entries_buf.end(), (char*)&count, (char*)&count + 2);
                new_entries_buf.insert(new_entries_buf.end(), (char*)ce.ids.data(),
                                      (char*)ce.ids.data() + ce.ids.size() * 4);
            }
        }
        return {new_entries_buf, new_cells_buf};
    };

    // Pre-rebuild entry/cell files using ID remaps (for use as zstd reference)
    std::unordered_map<std::string, std::string> rebuilt_refs; // filename → temp path
    if (!id_remaps.empty()) {
        // Rebuild geo entries (street, addr, interp)
        auto way_rm = id_remaps.count((uint32_t)PatchFileId::STREET_WAYS) ?
                       id_remaps[(uint32_t)PatchFileId::STREET_WAYS] : std::unordered_map<uint32_t,uint32_t>{};
        auto addr_rm = id_remaps.count((uint32_t)PatchFileId::ADDR_POINTS) ?
                        id_remaps[(uint32_t)PatchFileId::ADDR_POINTS] : std::unordered_map<uint32_t,uint32_t>{};
        auto interp_rm = id_remaps.count((uint32_t)PatchFileId::INTERP_WAYS) ?
                          id_remaps[(uint32_t)PatchFileId::INTERP_WAYS] : std::unordered_map<uint32_t,uint32_t>{};
        auto admin_rm = id_remaps.count((uint32_t)PatchFileId::ADMIN_POLYGONS) ?
                         id_remaps[(uint32_t)PatchFileId::ADMIN_POLYGONS] : std::unordered_map<uint32_t,uint32_t>{};

        // Rebuild geo: street_entries (off 8), addr_entries (off 12), interp_entries (off 16)
        auto old_geo = read_file(cur_dir + "/geo_cells.bin");
        auto old_se = read_file(cur_dir + "/street_entries.bin");
        auto old_ae = read_file(cur_dir + "/addr_entries.bin");
        auto old_ie = read_file(cur_dir + "/interp_entries.bin");

        // Parse + remap each entry type
        auto parse_and_remap = [&](const std::vector<char>& geo, size_t off_pos,
                                     const std::vector<char>& entries,
                                     const std::unordered_map<uint32_t,uint32_t>& rm) {
            size_t n = geo.size() / 20;
            std::vector<std::pair<uint64_t, std::vector<uint32_t>>> result;
            for (size_t i = 0; i < n; i++) {
                uint64_t cid; uint32_t off;
                memcpy(&cid, geo.data() + i * 20, 8);
                memcpy(&off, geo.data() + i * 20 + off_pos, 4);
                std::vector<uint32_t> ids;
                if (off != 0xFFFFFFFF && off + 2 <= entries.size()) {
                    uint16_t count; memcpy(&count, entries.data() + off, 2);
                    if (off + 2 + count * 4 <= entries.size()) {
                        for (uint16_t j = 0; j < count; j++) {
                            uint32_t id; memcpy(&id, entries.data() + off + 2 + j * 4, 4);
                            auto it = rm.find(id);
                            ids.push_back(it != rm.end() ? it->second : id);
                        }
                    }
                }
                std::sort(ids.begin(), ids.end());
                result.push_back({cid, std::move(ids)});
            }
            return result;
        };

        auto sc = parse_and_remap(old_geo, 8, old_se, way_rm);
        auto ac = parse_and_remap(old_geo, 12, old_ae, addr_rm);
        auto ic = parse_and_remap(old_geo, 16, old_ie, interp_rm);

        // Write rebuilt entries + geo_cells
        auto write_rebuilt = [&](const std::string& name,
                                  const std::vector<std::pair<uint64_t, std::vector<uint32_t>>>& entries) -> std::string {
            std::string path = tmpdir + "/" + name;
            std::vector<char> buf;
            std::unordered_map<uint64_t, uint32_t> offsets;
            for (auto& [cid, ids] : entries) {
                if (ids.empty()) continue;
                offsets[cid] = static_cast<uint32_t>(buf.size());
                uint16_t count = static_cast<uint16_t>(ids.size());
                buf.insert(buf.end(), (char*)&count, (char*)&count + 2);
                buf.insert(buf.end(), (char*)ids.data(), (char*)ids.data() + ids.size() * 4);
            }
            write_file(path, buf);
            return path;
        };

        rebuilt_refs["street_entries.bin"] = write_rebuilt("street_entries.bin", sc);
        rebuilt_refs["addr_entries.bin"] = write_rebuilt("addr_entries.bin", ac);
        rebuilt_refs["interp_entries.bin"] = write_rebuilt("interp_entries.bin", ic);

        // Rebuild geo_cells from the remapped entries
        {
            uint32_t no_data = 0xFFFFFFFF;
            std::vector<char> buf;
            // Build offset maps for each entry type
            std::unordered_map<uint64_t, uint32_t> s_off, a_off, i_off;
            auto entries_data = [](const std::string& path) {
                auto d = read_file(path);
                std::unordered_map<uint64_t, uint32_t> offsets;
                return d;
            };
            // Re-parse the rebuilt entries to get offsets
            auto get_offsets = [](const std::vector<std::pair<uint64_t, std::vector<uint32_t>>>& entries) {
                std::unordered_map<uint64_t, uint32_t> offsets;
                uint32_t pos = 0;
                for (auto& [cid, ids] : entries) {
                    if (ids.empty()) continue;
                    offsets[cid] = pos;
                    pos += 2 + ids.size() * 4;
                }
                return offsets;
            };
            auto so = get_offsets(sc), ao = get_offsets(ac), io = get_offsets(ic);

            size_t n = old_geo.size() / 20;
            for (size_t i = 0; i < n; i++) {
                uint64_t cid; memcpy(&cid, old_geo.data() + i * 20, 8);
                buf.insert(buf.end(), (char*)&cid, (char*)&cid + 8);
                auto get = [&](const auto& m) -> uint32_t {
                    auto it = m.find(cid); return it != m.end() ? it->second : no_data;
                };
                uint32_t sv = get(so), av = get(ao), iv = get(io);
                buf.insert(buf.end(), (char*)&sv, (char*)&sv + 4);
                buf.insert(buf.end(), (char*)&av, (char*)&av + 4);
                buf.insert(buf.end(), (char*)&iv, (char*)&iv + 4);
            }
            std::string path = tmpdir + "/geo_cells.bin";
            write_file(path, buf);
            rebuilt_refs["geo_cells.bin"] = path;
        }

        // Rebuild admin entries
        {
            auto [ae_data, ac_data] = rebuild_entries("admin_cells.bin", "admin_entries.bin",
                                                        12, 8, admin_rm, true);
            std::string ae_path = tmpdir + "/admin_entries.bin";
            std::string ac_path = tmpdir + "/admin_cells.bin";
            write_file(ae_path, ae_data);
            write_file(ac_path, ac_data);
            rebuilt_refs["admin_entries.bin"] = ae_path;
            rebuilt_refs["admin_cells.bin"] = ac_path;
        }

        std::cerr << "Rebuilt " << rebuilt_refs.size() << " entry/cell files from ID remaps" << std::endl;
    }

    // Process file sections
    while (pf) {
        uint32_t file_id; pf.read(reinterpret_cast<char*>(&file_id), 4);
        if (!pf || file_id == 0xFFFFFFFF) break;
        uint32_t encoding; pf.read(reinterpret_cast<char*>(&encoding), 4);

        if (file_id >= (uint32_t)PatchFileId::COUNT) {
            std::cerr << "  Unknown section " << file_id << std::endl;
            break;
        }
        const char* filename = patch_file_names[file_id];

        auto write_temp = [&](const std::string& path, uint64_t size) {
            std::ofstream zf(path, std::ios::binary);
            std::vector<char> buf(std::min(size, (uint64_t)1024*1024));
            uint64_t remaining = size;
            while (remaining > 0) {
                size_t chunk = std::min(remaining, (uint64_t)buf.size());
                pf.read(buf.data(), chunk);
                zf.write(buf.data(), chunk);
                remaining -= chunk;
            }
        };

        auto zstd_apply = [&](const std::string& ref, const std::string& zst, const std::string& out) -> bool {
            std::string cmd = "zstd --patch-from='" + ref + "' -d '" + zst + "' -o '" + out + "' -f --long=31 --quiet 2>/dev/null";
            return system(cmd.c_str()) == 0;
        };

        if (encoding == (uint32_t)PatchEncoding::ZSTD_DELTA) {
            uint64_t old_size, new_size, delta_size;
            pf.read(reinterpret_cast<char*>(&old_size), 8);
            pf.read(reinterpret_cast<char*>(&new_size), 8);
            pf.read(reinterpret_cast<char*>(&delta_size), 8);

            // Write zstd frame to temp
            std::string zst = tmpdir + "/" + std::string(filename) + ".zst";
            write_temp(zst, delta_size);

            // Check if we have a rebuilt ref (entry/cell files with ID remap)
            std::string ref;
            auto rit = rebuilt_refs.find(std::string(filename));
            if (rit != rebuilt_refs.end()) {
                ref = rit->second;
            } else {
                // Load old file, apply string remap + fixups → write remapped ref
                auto old_data = read_file(cur_dir + "/" + std::string(filename));
                apply_str_remap(old_data, file_id);
                apply_fixups(old_data, file_id);
                ref = tmpdir + "/" + std::string(filename) + ".ref";
                write_file(ref, old_data);
            }

            // Apply zstd delta
            std::string out = out_dir + "/" + std::string(filename);
            if (!zstd_apply(ref, zst, out)) {
                std::cerr << "FAILED: " << filename << std::endl; return 1;
            }
            std::cerr << "  " << filename << ": " << read_file(out).size() << " bytes" << std::endl;
            remove(zst.c_str()); remove(ref.c_str());

        } else {
            std::cerr << "  Unknown encoding " << encoding << " for " << filename << std::endl;
            break;
        }
    }

    // Cleanup
    std::string rm_cmd = "rm -rf '" + tmpdir + "'";
    system(rm_cmd.c_str());

    std::cerr << "Patch applied. Output in " << out_dir << std::endl;
    return 0;
}

-        rebuilt_refs["street_entries.bin"] = write_rebuilt("street_entries.bin", sc);

-        rebuilt_refs["addr_entries.bin"] = write_rebuilt("addr_entries.bin", ac);

-        rebuilt_refs["interp_entries.bin"] = write_rebuilt("interp_entries.bin", ic);

+        // Entry files: don't use rebuilt refs (diff uses old→new directly)

+        // Only geo_cells uses rebuilt ref (proven to match byte-identical)

+        write_rebuilt("street_entries.bin", sc); // write for geo_cells offset calculation

+        write_rebuilt("addr_entries.bin", ac);

+        write_rebuilt("interp_entries.bin", ic);


Also remove admin entry/cell from rebuilt_refs:


            rebuilt_refs["admin_entries.bin"] = ae_path;
            rebuilt_refs["admin_cells.bin"] = ac_path;

// Don't add admin entries/cells to rebuilt_refs (diff uses old→new directly)


// geocoder-patch: Apply a .gcpatch to a geocoder index directory.
//
// For each file: apply string remap to old, write temp, run zstd -d --patch-from.
//
// Usage: geocoder-patch <current-dir> <patch-file> -o <output-dir>

#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <string>
#include <unordered_map>
#include <vector>

#include <unistd.h>
#include "patch_format.h"

// --- String remap application ---

static void remap_addr_points(std::vector<char>& data,
                                const std::unordered_map<uint32_t,uint32_t>& rm) {
    for (size_t i = 0; i + 16 <= data.size(); i += 16) {
        for (size_t off : {8, 12}) {
            uint32_t v; memcpy(&v, data.data() + i + off, 4);
            auto it = rm.find(v);
            if (it != rm.end()) memcpy(data.data() + i + off, &it->second, 4);
        }
    }
}

static void remap_field(std::vector<char>& data, size_t stride, size_t field_off,
                          const std::unordered_map<uint32_t,uint32_t>& rm) {
    for (size_t i = 0; i + stride <= data.size(); i += stride) {
        uint32_t v; memcpy(&v, data.data() + i + field_off, 4);
        auto it = rm.find(v);
        if (it != rm.end()) memcpy(data.data() + i + field_off, &it->second, 4);
    }
}

int main(int argc, char* argv[]) {
    if (argc < 5 || std::string(argv[3]) != "-o") {
        std::cerr << "Usage: geocoder-patch <current-dir> <patch-file> -o <output-dir>" << std::endl;
        return 1;
    }
    std::string cur_dir = argv[1], patch_path = argv[2], out_dir = argv[4];
    ensure_dir(out_dir);

    std::string tmpdir = "/tmp/geocoder-patch-" + std::to_string(getpid());
    ensure_dir(tmpdir);

    std::ifstream pf(patch_path, std::ios::binary);
    if (!pf) { std::cerr << "Cannot open " << patch_path << std::endl; return 1; }

    // Read header
    char magic[8]; pf.read(magic, 8);
    if (memcmp(magic, GCPATCH_MAGIC, 8) != 0) {
        std::cerr << "Invalid patch file" << std::endl; return 1;
    }
    uint32_t version, flags;
    pf.read(reinterpret_cast<char*>(&version), 4);
    pf.read(reinterpret_cast<char*>(&flags), 4);
    if (version != GCPATCH_VERSION) {
        std::cerr << "Unsupported version " << version << std::endl; return 1;
    }

    // Read string remap
    std::unordered_map<uint32_t, uint32_t> str_remap;
    {
        uint32_t section_id; pf.read(reinterpret_cast<char*>(&section_id), 4);
        if (section_id == 0xFFFFFFFE) {
            uint32_t count; pf.read(reinterpret_cast<char*>(&count), 4);
            for (uint32_t i = 0; i < count; i++) {
                uint32_t old_off, new_off;
                pf.read(reinterpret_cast<char*>(&old_off), 4);
                pf.read(reinterpret_cast<char*>(&new_off), 4);
                if (old_off != new_off) str_remap[old_off] = new_off;
            }
            std::cerr << "Loaded " << str_remap.size() << " string remap entries" << std::endl;
        }
    }

    // Read offset fixup tables
    struct Fixup { uint32_t record_idx; uint32_t new_value; };
    std::unordered_map<uint32_t, std::vector<Fixup>> fixup_tables; // file_id → fixups
    std::unordered_map<uint32_t, uint32_t> fixup_strides; // file_id → stride
    while (pf) {
        uint32_t marker; pf.read(reinterpret_cast<char*>(&marker), 4);
        if (marker != FIXUP_MARKER) {
            pf.seekg(-4, std::ios::cur);
            break;
        }
        uint32_t fid, stride, count;
        pf.read(reinterpret_cast<char*>(&fid), 4);
        pf.read(reinterpret_cast<char*>(&stride), 4);
        pf.read(reinterpret_cast<char*>(&count), 4);
        auto& vec = fixup_tables[fid];
        fixup_strides[fid] = stride;
        vec.resize(count);
        for (uint32_t i = 0; i < count; i++) {
            pf.read(reinterpret_cast<char*>(&vec[i].record_idx), 4);
            pf.read(reinterpret_cast<char*>(&vec[i].new_value), 4);
        }
        std::cerr << "Loaded " << count << " fixups for file " << fid << std::endl;
    }

    // Detect struct strides from current files
    auto detect_stride = [&](const std::string& name, std::vector<size_t> cs) -> size_t {
        auto d = read_file(cur_dir + "/" + name);
        for (size_t s : cs) if (d.size() % s == 0 && d.size() > 0) return s;
        return cs[0];
    };
    size_t way_stride = detect_stride("street_ways.bin", {12, 9});
    size_t interp_stride = detect_stride("interp_ways.bin", {20, 18});
    size_t admin_stride = detect_stride("admin_polygons.bin", {24, 20, 19});

    // Helper: apply string remap to old data file
    auto apply_str_remap = [&](std::vector<char>& data, uint32_t file_id) {
        if (str_remap.empty()) return;
        if (file_id == (uint32_t)PatchFileId::ADDR_POINTS) {
            for (size_t i = 0; i + 16 <= data.size(); i += 16)
                for (size_t off : {8, 12}) {
                    uint32_t v; memcpy(&v, data.data() + i + off, 4);
                    auto it = str_remap.find(v);
                    if (it != str_remap.end()) memcpy(data.data() + i + off, &it->second, 4);
                }
        } else if (file_id == (uint32_t)PatchFileId::STREET_WAYS) {
            size_t name_off = (way_stride == 12) ? 8 : 5;
            for (size_t i = 0; i + way_stride <= data.size(); i += way_stride) {
                uint32_t v; memcpy(&v, data.data() + i + name_off, 4);
                auto it = str_remap.find(v);
                if (it != str_remap.end()) memcpy(data.data() + i + name_off, &it->second, 4);
            }
        } else if (file_id == (uint32_t)PatchFileId::INTERP_WAYS) {
            size_t soff = (interp_stride >= 20) ? 8 : 5;
            for (size_t i = 0; i + interp_stride <= data.size(); i += interp_stride) {
                uint32_t v; memcpy(&v, data.data() + i + soff, 4);
                auto it = str_remap.find(v);
                if (it != str_remap.end()) memcpy(data.data() + i + soff, &it->second, 4);
            }
        } else if (file_id == (uint32_t)PatchFileId::ADMIN_POLYGONS) {
            for (size_t i = 0; i + admin_stride <= data.size(); i += admin_stride) {
                uint32_t v; memcpy(&v, data.data() + i + 8, 4);
                auto it = str_remap.find(v);
                if (it != str_remap.end()) memcpy(data.data() + i + 8, &it->second, 4);
            }
        }
    };

    // Helper: apply offset fixups
    auto apply_fixups = [&](std::vector<char>& data, uint32_t file_id) {
        auto it = fixup_tables.find(file_id);
        if (it == fixup_tables.end()) return;
        uint32_t stride = fixup_strides[file_id];
        for (auto& f : it->second) {
            size_t pos = (size_t)f.record_idx * stride;
            if (pos + 4 <= data.size())
                memcpy(data.data() + pos, &f.new_value, 4);
        }
    };

    // Read ID remap tables
    std::unordered_map<uint32_t, std::unordered_map<uint32_t,uint32_t>> id_remaps; // file_id → (old→new)
    while (pf) {
        uint32_t marker; pf.read(reinterpret_cast<char*>(&marker), 4);
        if (marker != 0xFFFFFFFC) {
            pf.seekg(-4, std::ios::cur);
            break;
        }
        uint32_t fid, count;
        pf.read(reinterpret_cast<char*>(&fid), 4);
        pf.read(reinterpret_cast<char*>(&count), 4);
        auto& rm = id_remaps[fid];
        for (uint32_t i = 0; i < count; i++) {
            uint32_t old_id, new_id;
            pf.read(reinterpret_cast<char*>(&old_id), 4);
            pf.read(reinterpret_cast<char*>(&new_id), 4);
            rm[old_id] = new_id;
        }
        std::cerr << "Loaded " << count << " ID remaps for file " << fid << std::endl;
    }

    // Helper: rebuild entry + cell files using ID remap
    auto rebuild_entries = [&](const std::string& cells_file, const std::string& entries_file,
                                size_t cell_stride, size_t offset_pos,
                                const std::unordered_map<uint32_t,uint32_t>& id_rm, bool has_flags)
        -> std::pair<std::vector<char>, std::vector<char>> // (entries_data, cells_data)
    {
        auto old_cells = read_file(cur_dir + "/" + cells_file);
        auto old_entries = read_file(cur_dir + "/" + entries_file);
        size_t n_cells = old_cells.size() / cell_stride;

        // Parse old entries, remap IDs
        struct CellEntry { uint64_t cell_id; std::vector<uint32_t> ids; };
        std::vector<CellEntry> parsed;
        for (size_t i = 0; i < n_cells; i++) {
            uint64_t cid; uint32_t off;
            memcpy(&cid, old_cells.data() + i * cell_stride, 8);
            memcpy(&off, old_cells.data() + i * cell_stride + offset_pos, 4);
            CellEntry ce; ce.cell_id = cid;
            if (off != 0xFFFFFFFF && off + 2 <= old_entries.size()) {
                uint16_t count; memcpy(&count, old_entries.data() + off, 2);
                if (off + 2 + count * 4 <= old_entries.size()) {
                    for (uint16_t j = 0; j < count; j++) {
                        uint32_t id; memcpy(&id, old_entries.data() + off + 2 + j * 4, 4);
                        uint32_t flags = has_flags ? (id & 0x80000000u) : 0;
                        uint32_t masked = id & 0x7FFFFFFFu;
                        auto it = id_rm.find(masked);
                        if (it != id_rm.end())
                            ce.ids.push_back(it->second | flags);
                        else
                            ce.ids.push_back(id); // keep unmapped IDs as-is
                    }
                }
            }
            std::sort(ce.ids.begin(), ce.ids.end());
            parsed.push_back(std::move(ce));
        }

        // Rebuild entries + cells
        std::vector<char> new_entries_buf, new_cells_buf;
        uint32_t no_data = 0xFFFFFFFF;
        for (auto& ce : parsed) {
            new_cells_buf.insert(new_cells_buf.end(), (char*)&ce.cell_id, (char*)&ce.cell_id + 8);
            if (ce.ids.empty()) {
                new_cells_buf.insert(new_cells_buf.end(), (char*)&no_data, (char*)&no_data + 4);
            } else {
                uint32_t off = static_cast<uint32_t>(new_entries_buf.size());
                new_cells_buf.insert(new_cells_buf.end(), (char*)&off, (char*)&off + 4);
                uint16_t count = static_cast<uint16_t>(ce.ids.size());
                new_entries_buf.insert(new_entries_buf.end(), (char*)&count, (char*)&count + 2);
                new_entries_buf.insert(new_entries_buf.end(), (char*)ce.ids.data(),
                                      (char*)ce.ids.data() + ce.ids.size() * 4);
            }
        }
        return {new_entries_buf, new_cells_buf};
    };

    // Pre-rebuild entry/cell files using ID remaps (for use as zstd reference)
    std::unordered_map<std::string, std::string> rebuilt_refs; // filename → temp path
    if (!id_remaps.empty()) {
        // Rebuild geo entries (street, addr, interp)
        auto way_rm = id_remaps.count((uint32_t)PatchFileId::STREET_WAYS) ?
                       id_remaps[(uint32_t)PatchFileId::STREET_WAYS] : std::unordered_map<uint32_t,uint32_t>{};
        auto addr_rm = id_remaps.count((uint32_t)PatchFileId::ADDR_POINTS) ?
                        id_remaps[(uint32_t)PatchFileId::ADDR_POINTS] : std::unordered_map<uint32_t,uint32_t>{};
        auto interp_rm = id_remaps.count((uint32_t)PatchFileId::INTERP_WAYS) ?
                          id_remaps[(uint32_t)PatchFileId::INTERP_WAYS] : std::unordered_map<uint32_t,uint32_t>{};
        auto admin_rm = id_remaps.count((uint32_t)PatchFileId::ADMIN_POLYGONS) ?
                         id_remaps[(uint32_t)PatchFileId::ADMIN_POLYGONS] : std::unordered_map<uint32_t,uint32_t>{};

        // Rebuild geo: street_entries (off 8), addr_entries (off 12), interp_entries (off 16)
        auto old_geo = read_file(cur_dir + "/geo_cells.bin");
        auto old_se = read_file(cur_dir + "/street_entries.bin");
        auto old_ae = read_file(cur_dir + "/addr_entries.bin");
        auto old_ie = read_file(cur_dir + "/interp_entries.bin");

        // Parse + remap each entry type
        auto parse_and_remap = [&](const std::vector<char>& geo, size_t off_pos,
                                     const std::vector<char>& entries,
                                     const std::unordered_map<uint32_t,uint32_t>& rm) {
            size_t n = geo.size() / 20;
            std::vector<std::pair<uint64_t, std::vector<uint32_t>>> result;
            for (size_t i = 0; i < n; i++) {
                uint64_t cid; uint32_t off;
                memcpy(&cid, geo.data() + i * 20, 8);
                memcpy(&off, geo.data() + i * 20 + off_pos, 4);
                std::vector<uint32_t> ids;
                if (off != 0xFFFFFFFF && off + 2 <= entries.size()) {
                    uint16_t count; memcpy(&count, entries.data() + off, 2);
                    if (off + 2 + count * 4 <= entries.size()) {
                        for (uint16_t j = 0; j < count; j++) {
                            uint32_t id; memcpy(&id, entries.data() + off + 2 + j * 4, 4);
                            auto it = rm.find(id);
                            ids.push_back(it != rm.end() ? it->second : id);
                        }
                    }
                }
                std::sort(ids.begin(), ids.end());
                result.push_back({cid, std::move(ids)});
            }
            return result;
        };

        auto sc = parse_and_remap(old_geo, 8, old_se, way_rm);
        auto ac = parse_and_remap(old_geo, 12, old_ae, addr_rm);
        auto ic = parse_and_remap(old_geo, 16, old_ie, interp_rm);

        // Write rebuilt entries + geo_cells
        auto write_rebuilt = [&](const std::string& name,
                                  const std::vector<std::pair<uint64_t, std::vector<uint32_t>>>& entries) -> std::string {
            std::string path = tmpdir + "/" + name;
            std::vector<char> buf;
            std::unordered_map<uint64_t, uint32_t> offsets;
            for (auto& [cid, ids] : entries) {
                if (ids.empty()) continue;
                offsets[cid] = static_cast<uint32_t>(buf.size());
                uint16_t count = static_cast<uint16_t>(ids.size());
                buf.insert(buf.end(), (char*)&count, (char*)&count + 2);
                buf.insert(buf.end(), (char*)ids.data(), (char*)ids.data() + ids.size() * 4);
            }
            write_file(path, buf);
            return path;
        };

        // Entry files: don't use rebuilt refs (diff uses old→new directly)
        // Only geo_cells uses rebuilt ref (proven to match byte-identical)
        write_rebuilt("street_entries.bin", sc); // write for geo_cells offset calculation
        write_rebuilt("addr_entries.bin", ac);
        write_rebuilt("interp_entries.bin", ic);

        // Rebuild geo_cells from the remapped entries
        {
            uint32_t no_data = 0xFFFFFFFF;
            std::vector<char> buf;
            // Build offset maps for each entry type
            std::unordered_map<uint64_t, uint32_t> s_off, a_off, i_off;
            auto entries_data = [](const std::string& path) {
                auto d = read_file(path);
                std::unordered_map<uint64_t, uint32_t> offsets;
                return d;
            };
            // Re-parse the rebuilt entries to get offsets
            auto get_offsets = [](const std::vector<std::pair<uint64_t, std::vector<uint32_t>>>& entries) {
                std::unordered_map<uint64_t, uint32_t> offsets;
                uint32_t pos = 0;
                for (auto& [cid, ids] : entries) {
                    if (ids.empty()) continue;
                    offsets[cid] = pos;
                    pos += 2 + ids.size() * 4;
                }
                return offsets;
            };
            auto so = get_offsets(sc), ao = get_offsets(ac), io = get_offsets(ic);

            size_t n = old_geo.size() / 20;
            for (size_t i = 0; i < n; i++) {
                uint64_t cid; memcpy(&cid, old_geo.data() + i * 20, 8);
                buf.insert(buf.end(), (char*)&cid, (char*)&cid + 8);
                auto get = [&](const auto& m) -> uint32_t {
                    auto it = m.find(cid); return it != m.end() ? it->second : no_data;
                };
                uint32_t sv = get(so), av = get(ao), iv = get(io);
                buf.insert(buf.end(), (char*)&sv, (char*)&sv + 4);
                buf.insert(buf.end(), (char*)&av, (char*)&av + 4);
                buf.insert(buf.end(), (char*)&iv, (char*)&iv + 4);
            }
            std::string path = tmpdir + "/geo_cells.bin";
            write_file(path, buf);
            rebuilt_refs["geo_cells.bin"] = path;
        }

        // Rebuild admin entries
        {
            auto [ae_data, ac_data] = rebuild_entries("admin_cells.bin", "admin_entries.bin",
                                                        12, 8, admin_rm, true);
            std::string ae_path = tmpdir + "/admin_entries.bin";
            std::string ac_path = tmpdir + "/admin_cells.bin";
            write_file(ae_path, ae_data);
            write_file(ac_path, ac_data);
            rebuilt_refs["admin_entries.bin"] = ae_path;
            rebuilt_refs["admin_cells.bin"] = ac_path;
        }

        std::cerr << "Rebuilt " << rebuilt_refs.size() << " entry/cell files from ID remaps" << std::endl;
    }

    // Process file sections
    while (pf) {
        uint32_t file_id; pf.read(reinterpret_cast<char*>(&file_id), 4);
        if (!pf || file_id == 0xFFFFFFFF) break;
        uint32_t encoding; pf.read(reinterpret_cast<char*>(&encoding), 4);

        if (file_id >= (uint32_t)PatchFileId::COUNT) {
            std::cerr << "  Unknown section " << file_id << std::endl;
            break;
        }
        const char* filename = patch_file_names[file_id];

        auto write_temp = [&](const std::string& path, uint64_t size) {
            std::ofstream zf(path, std::ios::binary);
            std::vector<char> buf(std::min(size, (uint64_t)1024*1024));
            uint64_t remaining = size;
            while (remaining > 0) {
                size_t chunk = std::min(remaining, (uint64_t)buf.size());
                pf.read(buf.data(), chunk);
                zf.write(buf.data(), chunk);
                remaining -= chunk;
            }
        };

        auto zstd_apply = [&](const std::string& ref, const std::string& zst, const std::string& out) -> bool {
            std::string cmd = "zstd --patch-from='" + ref + "' -d '" + zst + "' -o '" + out + "' -f --long=31 --quiet 2>/dev/null";
            return system(cmd.c_str()) == 0;
        };

        if (encoding == (uint32_t)PatchEncoding::ZSTD_DELTA) {
            uint64_t old_size, new_size, delta_size;
            pf.read(reinterpret_cast<char*>(&old_size), 8);
            pf.read(reinterpret_cast<char*>(&new_size), 8);
            pf.read(reinterpret_cast<char*>(&delta_size), 8);

            // Write zstd frame to temp
            std::string zst = tmpdir + "/" + std::string(filename) + ".zst";
            write_temp(zst, delta_size);

            // Check if we have a rebuilt ref (entry/cell files with ID remap)
            std::string ref;
            auto rit = rebuilt_refs.find(std::string(filename));
            if (rit != rebuilt_refs.end()) {
                ref = rit->second;
            } else {
                // Load old file, apply string remap + fixups → write remapped ref
                auto old_data = read_file(cur_dir + "/" + std::string(filename));
                apply_str_remap(old_data, file_id);
                apply_fixups(old_data, file_id);
                ref = tmpdir + "/" + std::string(filename) + ".ref";
                write_file(ref, old_data);
            }

            // Apply zstd delta
            std::string out = out_dir + "/" + std::string(filename);
            if (!zstd_apply(ref, zst, out)) {
                std::cerr << "FAILED: " << filename << std::endl; return 1;
            }
            std::cerr << "  " << filename << ": " << read_file(out).size() << " bytes" << std::endl;
            remove(zst.c_str()); remove(ref.c_str());

        } else {
            std::cerr << "  Unknown encoding " << encoding << " for " << filename << std::endl;
            break;
        }
    }

    // Cleanup
    std::string rm_cmd = "rm -rf '" + tmpdir + "'";
    system(rm_cmd.c_str());

    std::cerr << "Patch applied. Output in " << out_dir << std::endl;
    return 0;
}

-            rebuilt_refs["admin_entries.bin"] = ae_path;

-            rebuilt_refs["admin_cells.bin"] = ac_path;

+            // Don't add admin entries/cells to rebuilt_refs (diff uses old→new directly)


Bash

cmake --build build -j$(nproc) --target geocoder-patch 2>&1 | tail -3 && sshpass -p 'elon-is-insane' scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" /root/traccar-geocoder/builder/build/geocoder-patch michtest@100.113.88.121:~/geocoder-patch 2>&1 && sshpass -p 'elon-is-insane' ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" michtest@100.113.88.121 '
rm -rf /home/michtest/patched7
/home/michtest/geocoder-patch /home/michtest/det-A /home/michtest/test7.gcpatch -o /home/michtest/patched7 2>&1
echo ""
all_match=true
for f in /home/michtest/det-new/*.bin; do
    b=$(basename $f); p=/home/michtest/patched7/$b
    [ -f "$p" ] && cmp -s "$f" "$p" && echo "  $b: MATCH" || { echo "  $b: FAIL"; all_match=false; }
done
$all_match && echo "ALL FILES MATCH" || echo "SOME DIFFER"
' 2>&1

Test with fixed refs


Command running in background with ID: bik5mqpzg. Output is being written to: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bik5mqpzg.output


_cfuvid=rDIYy6zo_MNR.WgkisQunnLaMlDG6Hm.2scz5JXH6c4-1774615929.6127625-1.0.1.1-x.axBRKsXHM2VXd3ikBjt3ST.bhHf_hwIkyc54cWsqI; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com


_cfuvid=jc8xkgnicZh9vxS9kloxFgZzG14tBG0Fp00FtJGFbRc-1774615931.1764717-1.0.1.1-v8U.jnxl1FHHTCWyla7pAzx1Rkk6XoVqoe6nQPf.Aoc; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com


sleep 30 && cat /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bik5mqpzg.output

Check results


[ 50%] Building CXX object CMakeFiles/geocoder-patch.dir/tools/geocoder_patch.cpp.o
[100%] Linking CXX executable geocoder-patch
[100%] Built target geocoder-patch
Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
Loaded 4980054 string remap entries
Loaded 19372891 fixups for file 1
Loaded 1016 fixups for file 4
Loaded 449642 fixups for file 6
Loaded 19372891 ID remaps for file 1
Loaded 85825938 ID remaps for file 3
Loaded 1016 ID remaps for file 4
Loaded 449642 ID remaps for file 6
Rebuilt 1 entry/cell files from ID remaps
  addr_points.bin: 1375841776 bytes
  street_ways.bin: 233626176 bytes
  interp_ways.bin: 335424 bytes
  admin_polygons.bin: 10820736 bytes
  strings.bin: 82573397 bytes
  street_nodes.bin: 1445600360 bytes
  interp_nodes.bin: 725184 bytes
  admin_vertices.bin: 291061192 bytes
  geo_cells.bin: 1674295440 bytes
  street_entries.bin: 586571766 bytes
  addr_entries.bin: 395005236 bytes
  interp_entries.bin: 159386 bytes
  admin_cells.bin: 1692000 bytes
  admin_entries.bin: 6122260 bytes
Patch applied. Output in /home/michtest/patched7

  addr_entries.bin: MATCH
  addr_points.bin: MATCH
  admin_cells.bin: MATCH
  admin_entries.bin: MATCH
  admin_polygons.bin: MATCH
  admin_vertices.bin: MATCH
  geo_cells.bin: MATCH
  interp_entries.bin: MATCH
  interp_nodes.bin: MATCH
  interp_ways.bin: MATCH
  street_entries.bin: MATCH
  street_nodes.bin: MATCH
  street_ways.bin: MATCH
  strings.bin: MATCH
ALL FILES MATCH


**ALL 14 FILES MATCH!** The complete pipeline is verified. Let me commit and summarize the final state:


git add tools/geocoder_diff.cpp tools/geocoder_patch.cpp tools/patch_format.h && git commit -m "$(cat <<'EOF'
feat: complete geocoder patch pipeline — all 14 files verified

Full diff→patch round-trip verified: all 14 files byte-identical.

Pipeline:
1. Deterministic builds (canonical sort in build_index.cpp)
2. geocoder-diff: string remap + record matching + offset fixups +
   zstd --patch-from deltas. Entry/cell files use direct old→new.
3. geocoder-patch: applies string remap, offset fixups, and
   zstd deltas. Rebuilds geo_cells from ID-remapped entries.

Patch size for Europe (4 days, 7 GiB dataset): 1.9 GiB
- Data files with remap: ~12 MiB (0.1-0.7%)
- Entry/cell files without remap: ~890 MiB (24-79%)
- Remap overhead (tables): ~845 MiB

Next: compress remap tables + optimize entry file patching to
reduce total to <100 MiB.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
EOF
)"

Commit: all 14 files verified


[main bb52163] feat: complete geocoder patch pipeline — all 14 files verified
 2 files changed, 13 insertions(+), 12 deletions(-)


_cfuvid=rhK1K_c2EzloBc8gUMSaf1z54QUBJCZhyXMNcsbSf50-1774615989.1588988-1.0.1.1-9MC6KHeTUW.ortrdEa485vJ1CMLQ_HczUjdHt_NolOs; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com


**Status summary:**

**Working and verified:**
- Deterministic builds (same PBF → byte-identical output)
- `geocoder-diff` produces `.gcpatch` files
- `geocoder-patch` applies them, producing byte-identical output to fresh builds
- All 14 files verified MATCH

**Patch size: 1.9 GiB** — broken down:
| Category | Size | Notes |
|----------|------|-------|
| Data files (with remap) | 12 MiB | addr_points 0.27%, ways 0.65%, nodes 0.47%, strings 0.09% |
| Entry/cell files (no remap) | 890 MiB | geo_cells 24%, addr_entries 79%, street_entries 31% |
| Remap tables (raw) | 845 MiB | 86M addr ID pairs + 19M way fixups |
| **Total** | **1.9 GiB** | |

**To reduce to target (<100 MiB):**
1. Compress remap tables (zstd should get 845 MiB → ~50 MiB since IDs are mostly sequential)
2. Use rebuilt entries as reference (fixes the subtle entry content mismatch to enable 0.02-0.07% deltas)
3. Those two changes alone would bring it to ~70 MiB

**Remaining test:** sequential patching (Test 3 — need a third PBF).


<task-notification>
<task-id>bu97tzhmo</task-id>
<tool-use-id>toolu_0124ggeUCQdLr5hXoEw1xh1U</tool-use-id>
<output-file>/tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bu97tzhmo.output</output-file>
<status>completed</status>
<summary>Background command "Check if full-remapped entries match new" completed (exit code 0)</summary>
</task-notification>
Read the output file to retrieve the result: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bu97tzhmo.output


<task-notification>
<task-id>bik5mqpzg</task-id>
<tool-use-id>toolu_012UiaRZuH7R5hR6q9E5guLZ</tool-use-id>
<output-file>/tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bik5mqpzg.output</output-file>
<status>completed</status>
<summary>Background command "Test with fixed refs" completed (exit code 0)</summary>
</task-notification>
Read the output file to retrieve the result: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bik5mqpzg.output


Those are already-processed notifications. The current state is clean — all 14 files verified matching with the latest commit.

The big remaining wins are compressing the remap tables (845 MiB raw → ~50 MiB compressed) and fixing the entry rebuild to enable tiny entry deltas. That would bring the total from 1.9 GiB to ~70 MiB. Want me to keep pushing on that, or would you prefer to review the current code first?


that is great, however i thjnk we can get this significantly smaller. lets work on that now


The biggest wins:
1. **Compress remap/fixup tables** (845 MiB raw → ~50 MiB compressed)
2. **Fix entry rebuild** to enable tiny entry deltas (890 MiB → ~7 MiB)

Let me start with compressing the tables — that's straightforward:


# Quick estimate: how well do the remap/fixup tables compress?
# Simulate by creating test data with similar patterns
python3 -c "
import struct, os

# Simulate addr ID remap: 86M sequential pairs with small deltas
# Most old_id maps to old_id + small_offset
data = bytearray()
for i in range(1000000):  # 1M sample
    old_id = i
    new_id = i + (i % 100)  # small shift
    data += struct.pack('<II', old_id, new_id)

with open('/tmp/test_remap.bin', 'wb') as f:
    f.write(data)

os.system('zstd -19 /tmp/test_remap.bin -o /tmp/test_remap.zst -f --quiet')
raw = os.path.getsize('/tmp/test_remap.bin')
comp = os.path.getsize('/tmp/test_remap.zst')
print(f'1M pairs: {raw} -> {comp} ({comp*100//raw}%)')
print(f'Extrapolated 86M pairs: {raw*86//1000000} MiB -> {comp*86//1000000} MiB')
os.remove('/tmp/test_remap.bin')
os.remove('/tmp/test_remap.zst')
"

Estimate remap table compression


Error: Exit code 1
sh: 1: zstd: not found
Traceback (most recent call last):
  File "<string>", line 17, in <module>
    comp = os.path.getsize('/tmp/test_remap.zst')
  File "<frozen genericpath>", line 86, in getsize
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/test_remap.zst'


Install zstd CLI


Preparing to unpack .../zstd_1.5.7+dfsg-1_amd64.deb ...
Unpacking zstd (1.5.7+dfsg-1) ...
Setting up zstd (1.5.7+dfsg-1) ...


Actually, let me skip simulation and just directly measure the real tables on node 3. But more importantly, let me think about what will have the biggest impact and tackle that.

The remap tables exist because the patch tool needs them to reconstruct the remapped reference before applying zstd deltas. But there's a simpler architecture: **don't include remap tables at all. Instead, have the diff tool bake ALL transformations into the zstd delta itself.**

The current flow:
- Diff: remap old → remapped_old, then zstd(remapped_old, new) → tiny delta
- Patch: read tables, remap old → remapped_old, apply delta → new
- Problem: tables are huge

Better flow:
- Diff: just compute zstd(old, new) directly — but with the remap applied internally to get better matching
- Wait, that's what the original approach did and it gave 973 MiB

The fundamental issue: zstd --patch-from on raw old→new gives ~973 MiB. With remap as preprocessing, the delta is 12 MiB. But the remap tables are 845 MiB. We need 845 MiB of metadata to save 960 MiB of delta. Net savings: 115 MiB.

To make this work, the remap tables must compress much smaller than the delta savings. Let me just compress them and see:


sshpass -p 'elon-is-insane' ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" michtest@100.113.88.121 '
# Extract remap tables from the patch file and measure compression
python3 << "PYEOF"
import struct, os, subprocess

f = open("/home/michtest/test7.gcpatch", "rb")
magic = f.read(8)
ver, flags = struct.unpack("<II", f.read(8))

# String remap
marker = struct.unpack("<I", f.read(4))[0]
assert marker == 0xFFFFFFFE
count = struct.unpack("<I", f.read(4))[0]
str_remap_data = f.read(count * 8)
print(f"String remap: {len(str_remap_data)} bytes ({count} entries)")

# Fixup tables
fixup_data = bytearray()
while True:
    marker = struct.unpack("<I", f.read(4))[0]
    if marker != 0xFFFFFFFD:
        f.seek(-4, 1)
        break
    fid, stride, cnt = struct.unpack("<III", f.read(12))
    data = f.read(cnt * 8)
    fixup_data += data
    print(f"  Fixup file {fid}: {cnt} entries ({len(data)} bytes)")
print(f"Fixup total: {len(fixup_data)} bytes")

# ID remap tables
id_remap_data = bytearray()
while True:
    marker = struct.unpack("<I", f.read(4))[0]
    if marker != 0xFFFFFFFC:
        f.seek(-4, 1)
        break
    fid, cnt = struct.unpack("<II", f.read(8))
    data = f.read(cnt * 8)
    id_remap_data += data
    print(f"  ID remap file {fid}: {cnt} entries ({len(data)} bytes)")
print(f"ID remap total: {len(id_remap_data)} bytes")

f.close()

# Write all tables to temp files and compress
for name, data in [("str_remap", str_remap_data), ("fixups", bytes(fixup_data)), ("id_remaps", bytes(id_remap_data)), ("all_tables", str_remap_data + bytes(fixup_data) + bytes(id_remap_data))]:
    path = f"/tmp/{name}.bin"
    with open(path, "wb") as out:
        out.write(data)
    subprocess.run(["zstd", "-19", path, "-o", f"{path}.zst", "-f", "--quiet"], check=True)
    raw = os.path.getsize(path)
    comp = os.path.getsize(f"{path}.zst")
    print(f"{name}: {raw//1024//1024} MiB -> {comp//1024//1024} MiB ({comp*100//raw}%)")
    os.remove(path)
    os.remove(f"{path}.zst")
PYEOF
' 2>&1

Measure real remap table compression


Command running in background with ID: b580hntcx. Output is being written to: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/b580hntcx.output


sleep 60 && cat /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/b580hntcx.output

Check compression results


Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
String remap: 39856416 bytes (4982052 entries)
  Fixup file 1: 19372891 entries (154983128 bytes)
  Fixup file 4: 1016 entries (8128 bytes)
  Fixup file 6: 449642 entries (3597136 bytes)
Fixup total: 158588392 bytes
  ID remap file 1: 19372891 entries (154983128 bytes)
  ID remap file 3: 85825938 entries (686607504 bytes)
  ID remap file 4: 1016 entries (8128 bytes)
  ID remap file 6: 449642 entries (3597136 bytes)
ID remap total: 845195896 bytes
str_remap: 38 MiB -> 11 MiB (29%)
fixups: 151 MiB -> 41 MiB (27%)
id_remaps: 806 MiB -> 187 MiB (23%)
all_tables: 995 MiB -> 240 MiB (24%)


All tables compress from **995 MiB to 240 MiB** (24%). That's decent but still large. The ID remap table alone is 187 MiB compressed — that's the 86M addr pairs dominating.

The question: do we even NEED the ID remap tables? They're only used by the patch tool to rebuild entry files. If instead we fix the entry rebuild bug (so rebuilt entries match new entries exactly), then:
- Diff uses rebuilt entries as zstd reference → tiny deltas (0.02-0.07%)
- Patch rebuilds entries using the same logic → same reference → correct deltas
- No ID remap tables needed in the patch!

But the fixup tables ARE needed (for node_offset/vertex_offset fixes in data files).

So the path to smallest patches:
1. Fix entry rebuild (eliminate 890 MiB of entry deltas AND 845 MiB of ID remaps)
2. Compress string remap + fixup tables (40+159 MiB → ~52 MiB)
3. Data file deltas stay at 12 MiB
4. Entry deltas become ~7 MiB

**Target total: ~71 MiB**

Let me focus on fixing the entry rebuild. The issue: the diff tool's rebuilt entries don't match the new entries (same size, different content). Let me find the exact difference:


sshpass -p 'elon-is-insane' ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" michtest@100.113.88.121 '
# Compare full-remapped entries (which are just copies of new) with det-new entries
# The full-remapped test used new entries directly, and they matched geo_cells.
# But the DIFF TOOL rebuilt entries differently.
# Lets check: does det-new addr_entries match det-new addr_entries built from the overlay logic?

# Write a quick python check
python3 << "PYEOF"
import struct

def parse_geo_cells(path):
    data = open(path, "rb").read()
    n = len(data) // 20
    cells = []
    for i in range(n):
        cid, s, a, ip = struct.unpack_from("<QIII", data, i*20)
        cells.append((cid, s, a, ip))
    return cells

def parse_entry(data, off):
    if off == 0xFFFFFFFF or off + 2 > len(data): return []
    count = struct.unpack_from("<H", data, off)[0]
    if off + 2 + count*4 > len(data): return []
    return list(struct.unpack_from("<" + "I"*count, data, off+2))

old_geo = parse_geo_cells("/home/michtest/det-A/geo_cells.bin")
new_geo = parse_geo_cells("/home/michtest/det-new/geo_cells.bin")
old_ae = open("/home/michtest/det-A/addr_entries.bin", "rb").read()
new_ae = open("/home/michtest/det-new/addr_entries.bin", "rb").read()

# Check: for the first few differing cells, what are the IDs?
diffs = 0
for i, (cid, s, a, ip) in enumerate(new_geo):
    new_ids = parse_entry(new_ae, a)
    # Find this cell in old
    old_a = None
    for oc, os, oa, oip in old_geo:
        if oc == cid:
            old_a = oa
            break
    if old_a is None: continue
    old_ids = parse_entry(old_ae, old_a)
    if sorted(old_ids) != sorted(new_ids) and diffs < 5:
        print(f"Cell {cid}: old={sorted(old_ids)[:5]}... new={sorted(new_ids)[:5]}...")
        print(f"  old count={len(old_ids)} new count={len(new_ids)}")
        diffs += 1
    if diffs >= 5: break

print(f"Checked first differences in addr entries")
PYEOF
' 2>&1

Check entry content differences


Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
Cell 806734178941927424: old=[49945552]... new=[50009492]...
  old count=1 new count=1
Cell 806734179210362880: old=[49945547]... new=[50009487]...
  old count=1 new count=1
Cell 806734185787031552: old=[49862832]... new=[49926489]...
  old count=1 new count=1
Cell 806734185921249280: old=[49862837]... new=[49926494]...
  old count=1 new count=1
Cell 806734186458120192: old=[49862828]... new=[49926485]...
  old count=1 new count=1
Checked first differences in addr entries