    // Process file sections
    while (pf) {

    // 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) {

// 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};
    };

    // 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);

            // 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);
            std::string 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;
}

+    // 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

+        // 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)});

+        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::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);

+        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;

+            // 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);

+            // Re-parse the rebuilt entries to get offsets

+            auto get_offsets = [](const std::vector<std::pair<uint64_t, std::vector<uint32_t>>>& entries) {

+                for (auto& [cid, ids] : entries) {

+                    if (ids.empty()) continue;

+                    offsets[cid] = pos;

+            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";

+            rebuilt_refs["geo_cells.bin"] = path;

+            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;


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

_cfuvid=u.X20PmltYZDZhKfzf8JLAm__mLgPGaztHUjQrSPimI-1774614119.8489683-1.0.1.1-7jb44eh6aW4WDnc1xcjajdLDN8cFZrzuH.eIRWPKwIU; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com

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


_cfuvid=vMyIuvCJA44JheapipfcfjMzXKh.S9Q8zcihibNHXH8-1774614121.5832748-1.0.1.1-cZ_mLtZVpqvgpow9PGZOp3JaTBbplGzY7fdJjo4XVg0; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com


Now update the zstd_apply section to use rebuilt refs for entry/cell files:


Edit

            // 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);
            std::string ref = tmpdir + "/" + std::string(filename) + ".ref";
            write_file(ref, old_data);

            // 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);
            }


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

            // 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);
            }

// 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);

            // 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);
            std::string 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;
}

-            // 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);

-            std::string ref = tmpdir + "/" + std::string(filename) + ".ref";

+            // Check if we have a rebuilt ref (entry/cell files with ID remap)

+            auto rit = rebuilt_refs.find(std::string(filename));

+            if (rit != rebuilt_refs.end()) {

+                // 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);


Also need to update the diff tool to use rebuilt entries as reference (change `use_old_as_ref` back to false for entry/cell files):


Bash

cmake --build build -j$(nproc) --target geocoder-diff --target geocoder-patch 2>&1 | tail -5

Build both tools


[100%] Linking CXX executable geocoder-diff
[100%] Built target geocoder-diff
[ 50%] Building CXX object CMakeFiles/geocoder-patch.dir/tools/geocoder_patch.cpp.o
[100%] Linking CXX executable geocoder-patch
[100%] Built target geocoder-patch


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/test6.gcpatch
/home/michtest/geocoder-diff /home/michtest/det-A /home/michtest/det-new -o /home/michtest/test6.gcpatch 2>&1
echo "Patch: $(numfmt --to=iec $(stat -c%s /home/michtest/test6.gcpatch))"
echo ""
rm -rf /home/michtest/patched6
/home/michtest/geocoder-patch /home/michtest/det-A /home/michtest/test6.gcpatch -o /home/michtest/patched6 2>&1
echo ""
all_match=true
for f in /home/michtest/det-new/*.bin; do
    b=$(basename $f); p=/home/michtest/patched6/$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

Full test with entry rebuild in patch tool


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: 396021062 bytes (23.65%)
  street_entries.bin: 120945 bytes (0.02%)
  addr_entries.bin: 273895 bytes (0.07%)
  interp_entries.bin: 82 bytes (0.05%)
  admin_cells.bin: 182 bytes (0.01%)
  admin_entries.bin: 1248 bytes (0.02%)

Total patch: 1452786735 bytes (1385 MiB)
Patch: 1.4G

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
FAILED: geo_cells.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: FAIL
  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


Data files all match! The entry/cell files fail because the patch tool's rebuild doesn't match the diff tool's rebuild exactly (likely different cell sets — the diff tool merges with new cells, the patch tool only remaps old cells).

Also the patch is 1.4 GiB because the raw ID remap tables are huge: addr_points alone is 687 MiB (86M × 8 bytes). These need compression.

The issues are:
1. ID remap tables are uncompressed (687 MiB for addrs alone)
2. geo_cells rebuild in patch tool doesn't match diff tool's version (different cell merging)

The geo_cells issue: the diff tool overlays new entries on top of remapped old, adding new cells and removing old ones. The patch tool only remaps old cells without the new cell info. The fix: include the new cell list in the patch.

But this is getting very complex. Let me take a step back. The approach of including raw ID remap tables is impractical at 687 MiB. I need a more compact encoding.

Given the time invested and complexity, let me commit what works (data files are perfect) and note the remaining work. The entry/cell files need a different approach — perhaps including them as compressed full replacements (~260 MiB for geo_cells standalone zstd) since the remap table approach is larger than the files themselves.


git add tools/geocoder_diff.cpp tools/geocoder_patch.cpp tools/patch_format.h && git commit -m "$(cat <<'EOF'
wip: add record ID remap tables + entry rebuild to patch pipeline

Added ID remap tables (old_id → new_id for matched records) to the
patch format, and entry file rebuilding in the patch tool. Data files
(addr_points, ways, nodes, vertices, polygons) all verified MATCH.

Entry/cell files still fail due to:
1. Raw ID remap tables are too large (687 MiB for 86M addr records)
2. Patch tool's entry rebuild doesn't include new/removed cells

The data file approach is proven and working (12 MiB total).
Entry files need either compressed ID remaps or full replacement.

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

Commit WIP: ID remap tables


[main f927d2a] wip: add record ID remap tables + entry rebuild to patch pipeline
 2 files changed, 237 insertions(+), 6 deletions(-)


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_cfuvid=oGFemmrC.chU_I3CQuBxwgMU0J7XxbGbovSZoEoNRss-1774614682.5658934-1.0.1.1-A0G8cqt9woGgc2v6JYrwD1F7XO.F5VIXhEK3tmd33EI; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com


Let me update the memory with current state:


Edit

**Next steps:**
1. Implement geo_cells reconstruction in patch applicator (eliminate 260 MiB)
2. Implement proper node_offset/vertex_offset field remapping in way/polygon matching (eliminate 69 MiB)
3. Package the remap tables + deltas into the .gcpatch format
4. Test sequential patching (day1→day2→day3)

**Next steps:**
1. Compress or replace the ID remap tables (currently 687 MiB raw — bigger than the files themselves!)
   - Option A: Include entry/cell files as zstd-compressed full replacements (~260 MiB for geo_cells)
   - Option B: Encode ID remaps as delta arrays (matched records tend to have similar old→new shifts)
   - Option C: Only include the "changed cells" diff (most cells are identical after remap)
2. Fix entry rebuild in patch tool (missing new/removed cell handling)
3. Test sequential patching (day1→day2→day3)
4. Download third Europe PBF for sequential test


The file /root/.claude/projects/-root-traccar-geocoder/memory/project_patch_system.md has been updated successfully.

**Next steps:**
1. Compress or replace the ID remap tables (currently 687 MiB raw — bigger than the files themselves!)
   - Option A: Include entry/cell files as zstd-compressed full replacements (~260 MiB for geo_cells)
   - Option B: Encode ID remaps as delta arrays (matched records tend to have similar old→new shifts)
   - Option C: Only include the "changed cells" diff (most cells are identical after remap)
2. Fix entry rebuild in patch tool (missing new/removed cell handling)
3. Test sequential patching (day1→day2→day3)
4. Download third Europe PBF for sequential test

---
name: patch_system_design
description: Custom geocoder patch system - canonicalize/diff/patch tools for incremental index updates
type: project
---

Building a 3-tool patch system for incremental geocoder index updates:

1. **geocoder-canonicalize** — normalizes build output to deterministic byte order (strings sorted alphabetically, records sorted by content fingerprint, nodes grouped by parent record, entries derived from canonical data). ~5 min for Europe.

2. **geocoder-diff** — compares two canonical builds, produces .gcpatch file. Uses string remapping (old string offsets → new) before binary diffing data files. COPY/INSERT block encoding for delta sections, full replacement for small files.

3. **geocoder-patch** — applies .gcpatch to old canonical build, produces new canonical build.

**Why:** Sequential patching works because canonical output is deterministic — same semantic data always produces same bytes.

**Status (2026-03-27):** Three-level remap proven: string remap + record ID remap + entry ID remap.

Results (Europe, 4 days of changes, 7 GiB dataset):
- Data files: **25 MiB** (0.2-0.7%) — string remap makes records byte-identical
- Entry files: **6 MiB** (0.5-0.7%) — record ID remap makes entry lists nearly identical
- geo_cells.bin: **379 MiB** (24%) — cascading byte offsets from cell additions/removals
- geo_cells full replacement compressed: **260 MiB**
- street_ways: **69 MiB** (31%) — node_offset field differs between canonical builds
- Total achievable now: **~300 MiB** (with geo_cells full replacement)
- Target: **<50 MiB** (requires geo_cells reconstruction from entry deltas on client)

Key files implemented: geocoder-canonicalize (works), full-remap-test (proves approach), diff/patch (framework, needs update for remap-based encoding).

**Next steps:**
1. Implement geo_cells reconstruction in patch applicator (eliminate 260 MiB)
2. Implement proper node_offset/vertex_offset field remapping in way/polygon matching (eliminate 69 MiB)
3. Package the remap tables + deltas into the .gcpatch format
4. Test sequential patching (day1→day2→day3)

**Key challenge:** String offsets differ between independent builds. The diff tool remaps old file's string offsets to match new build's pool before computing binary diff. This makes ~99.7% of record bytes match (only truly changed records differ).

**Files:**
- builder/tools/patch_format.h — shared format definitions
- builder/tools/geocoder_canonicalize.cpp
- builder/tools/geocoder_diff.cpp
- builder/tools/geocoder_patch.cpp
- builder/CMakeLists.txt — 3 new targets added

**How to apply:** The build_index.cpp was reverted to its original state (no --previous-build, no stabilization). Patching is entirely post-build.

-1. Implement geo_cells reconstruction in patch applicator (eliminate 260 MiB)

-2. Implement proper node_offset/vertex_offset field remapping in way/polygon matching (eliminate 69 MiB)

-3. Package the remap tables + deltas into the .gcpatch format

-4. Test sequential patching (day1→day2→day3)

+1. Compress or replace the ID remap tables (currently 687 MiB raw — bigger than the files themselves!)

+   - Option A: Include entry/cell files as zstd-compressed full replacements (~260 MiB for geo_cells)

+   - Option B: Encode ID remaps as delta arrays (matched records tend to have similar old→new shifts)

+   - Option C: Only include the "changed cells" diff (most cells are identical after remap)

+2. Fix entry rebuild in patch tool (missing new/removed cell handling)

+3. Test sequential patching (day1→day2→day3)

+4. Download third Europe PBF for sequential test


Here's where we stand:

**Working and verified:**
- Deterministic builds (same PBF → byte-identical output)
- Data file patching with string remap + offset fixups: **12 MiB** for 8 data files
- Full round-trip verified for data files (addr_points, street_ways, interp_ways, admin_polygons, strings, street_nodes, interp_nodes, admin_vertices all MATCH)

**Remaining problem: entry/cell files (~960 MiB of the 1.05 GiB patch)**
- geo_cells.bin: 396 MiB (23.7% of 1.6 GiB)
- addr_entries.bin: 313 MiB (79%)
- street_entries.bin: 180 MiB (30.6%)
- Raw ID remap tables for these are even larger (687 MiB)

The most practical next step: include entry/cell files as **zstd-compressed full replacements** (~400 MiB total). Combined with the 12 MiB data deltas + 200 MiB remap overhead, total would be ~600 MiB. Not ideal but functional.

Alternatively: only encode the **changed cells** (0.3% of cells × ~20 bytes ≈ 5 MiB) and have the patch tool rebuild entry/cell files. But this requires the patch tool to replicate the full entry rebuild logic including handling new/removed cells — which means it needs the new cell list.


<task-notification>
<task-id>bh5br55ot</task-id>
<tool-use-id>toolu_01A2eWha1EXpz8rKabaChK7w</tool-use-id>
<output-file>/tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bh5br55ot.output</output-file>
<status>completed</status>
<summary>Background command "Check geo_cells baseline" 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/bh5br55ot.output


     1→Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
     2→Building string remap...
     3→  4980078 strings mapped
     4→Building record ID remaps...
     5→    addr matched=85825938/85891830 new=164173
     6→    ways matched=19372891/19452480 new=95957
     7→    interps matched=1016/16785 new=15755
     8→    admin matched=449642/450907 new=1222
     9→  Remapping geo entries...
    10→  Remapping admin entries...
    11→  Remap: 4982052 entries
    12→  strings.bin: 71309 bytes (0.09%)
    13→  addr_points.bin: 3770551 bytes (0.27%)
    14→  street_ways.bin: 1515482 bytes (0.65%)
    15→  interp_ways.bin: 66381 bytes (19.79%)
    16→  admin_polygons.bin: 39775 bytes (0.37%)
    17→  street_nodes.bin: 906243 bytes (0.06%)
    18→  interp_nodes.bin: 338 bytes (0.05%)
    19→  admin_vertices.bin: 249709 bytes (0.09%)
    20→  geo_cells.bin: 396021062 bytes (23.65%)
    21→  street_entries.bin: 120945 bytes (0.02%)
    22→---
    23→This is a dead end - lets check a simpler path
    24→geo_cells: diff of rebuilt vs new
    25→  geo_cells.bin             379M
    26→  street_entries.bin        172M
    27→  addr_entries.bin          299M
    28→

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
  strings.bin: 71309 bytes (0.09%)
  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%)
  street_nodes.bin: 906243 bytes (0.06%)
  interp_nodes.bin: 338 bytes (0.05%)
  admin_vertices.bin: 249709 bytes (0.09%)
  geo_cells.bin: 396021062 bytes (23.65%)
  street_entries.bin: 120945 bytes (0.02%)
---
This is a dead end - lets check a simpler path
geo_cells: diff of rebuilt vs new
  geo_cells.bin             379M
  street_entries.bin        172M
  addr_entries.bin          299M


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_cfuvid=lJxG3qpHm4tv7b_fZlJVjcdC5dnW4wo3NpwCagXNC0M-1774614715.605087-1.0.1.1-IFhgRSefga1Y3Yc3cw8mZjSGIh1dUSJBebR2wYpjWIo; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com


This was the earlier run. The key observation: when the diff tool uses its rebuilt entries as reference, street_entries goes from 172 MiB to 121 KB (0.02%) and addr_entries from 299 MiB to 274 KB (0.07%). But geo_cells remains at 396 MiB even with rebuilt reference.

That means the diff tool's rebuilt geo_cells doesn't match the new geo_cells — the cell set or offset computation differs. The entry rebuild works perfectly, but geo_cells rebuild has a bug.

The issue is likely that the diff tool's geo_cells rebuild uses the old cell set (from old geo_cells) while the new build has different cells. Even though the overlay adds new entries, the cell_id list comes from the old geo_cells — new cells that appear in the new build but not the old are missing.

This is a solvable bug, but the bigger picture question is: should I keep trying to get the entry/cell rebuild perfect, or should the user review the approach first? The data files are proven at 12 MiB. The entry/cell issue is a correctness bug in the rebuild, not a fundamental design problem.

Let me continue — the fix is to use the NEW build's cell set when rebuilding geo_cells in the diff tool, not the old one. Let me check and fix this.


383:            new_cells[cid] = true;
387:            new_cells.count(it->first) ? ++it : it = sc.erase(it);
389:            new_cells.count(it->first) ? ++it : it = ac.erase(it);
391:            new_cells.count(it->first) ? ++it : it = ic.erase(it);


   395→        auto write_geo = [&](const std::string& dir,
   396→                              const std::unordered_map<uint64_t, std::vector<uint32_t>>& s,
   397→                              const std::unordered_map<uint64_t, std::vector<uint32_t>>& a,
   398→                              const std::unordered_map<uint64_t, std::vector<uint32_t>>& ip) {
   399→            // Collect all cells
   400→            std::vector<uint64_t> all_cells;
   401→            for (auto& [id, _] : new_cells) all_cells.push_back(id);
   402→            std::sort(all_cells.begin(), all_cells.end());
   403→
   404→            auto write_ent = [&](const std::string& path,
   405→                                  const std::unordered_map<uint64_t, std::vector<uint32_t>>& cm)
   406→                -> std::unordered_map<uint64_t, uint32_t>
   407→            {
   408→                std::vector<char> buf;
   409→                std::unordered_map<uint64_t, uint32_t> offsets;
   410→                for (uint64_t cid : all_cells) {
   411→                    auto it = cm.find(cid);
   412→                    if (it == cm.end() || it->second.empty()) continue;
   413→                    offsets[cid] = static_cast<uint32_t>(buf.size());
   414→                    uint16_t count = static_cast<uint16_t>(it->second.size());
   415→                    buf.insert(buf.end(), (char*)&count, (char*)&count + 2);
   416→                    buf.insert(buf.end(), (char*)it->second.data(),
   417→                              (char*)it->second.data() + it->second.size() * 4);
   418→                }
   419→                write_file(path, buf);
   420→                return offsets;
   421→            };
   422→
   423→            auto so = write_ent(dir + "/street_entries.bin", s);
   424→            auto ao = write_ent(dir + "/addr_entries.bin", a);
   425→            auto io = write_ent(dir + "/interp_entries.bin", ip);
   426→
   427→            uint32_t no_data = 0xFFFFFFFF;
   428→            std::vector<char> buf;
   429→            for (uint64_t cid : all_cells) {
   430→                buf.insert(buf.end(), (char*)&cid, (char*)&cid + 8);
   431→                auto g = [&](const auto& m) -> uint32_t {
   432→                    auto it = m.find(cid); return (it != m.end()) ? it->second : no_data;
   433→                };
   434→                uint32_t sv = g(so), av = g(ao), iv = g(io);
   435→                buf.insert(buf.end(), (char*)&sv, (char*)&sv + 4);
   436→                buf.insert(buf.end(), (char*)&av, (char*)&av + 4);
   437→                buf.insert(buf.end(), (char*)&iv, (char*)&iv + 4);
   438→            }
   439→            write_file(dir + "/geo_cells.bin", buf);
   440→        };
   441→
   442→        write_geo(tmpdir, sc, ac, ic);
   443→    }
   444→

        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);
    }


_cfuvid=PCXPRxJcAgo9f5.sQPAjRYbespDKpCJVIFRHpf0VTLI-1774614738.668955-1.0.1.1-COKWTXx3jnjkWcIP6NOflRIWYKbr.rytNcx8cpEsAQM; HttpOnly; SameSite=None; Secure; Path=/; Domain=api.anthropic.com


The diff tool's rebuild uses `new_cells` for the cell set and overlays all new entries. This SHOULD produce output identical to the new build. But the 396 MiB diff says otherwise.

The issue might be subtle: the new build's `write_entries_from_sorted` function writes entries in a specific order (iterating sorted pairs), and cells with NO entries for a given type don't appear in that type's entry file but DO appear in geo_cells with NO_DATA offset. The diff's rebuild might differ in which cells get NO_DATA.

Let me verify: is the rebuilt geo_cells byte-identical to new geo_cells? Let me add a quick check:


Bash

sshpass -p 'elon-is-insane' ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" michtest@100.113.88.121 '
# Quick check: do rebuilt entries match new entries?
for f in street_entries.bin addr_entries.bin interp_entries.bin geo_cells.bin admin_cells.bin admin_entries.bin; do
    t=/tmp/geocoder-diff-*/&f  # temp files were cleaned, need to re-run diff
    echo "Cannot check temp files (cleaned)"
    break
done
# Instead: compute sizes of new entry files
echo "New entry file sizes:"
for f in geo_cells.bin street_entries.bin addr_entries.bin interp_entries.bin admin_cells.bin admin_entries.bin; do
    echo "  $f: $(stat -c%s /home/michtest/det-new/$f)"
done
echo ""
echo "Old entry file sizes:"
for f in geo_cells.bin street_entries.bin addr_entries.bin interp_entries.bin admin_cells.bin admin_entries.bin; do
    echo "  $f: $(stat -c%s /home/michtest/det-A/$f)"
done
' 2>&1

Check entry file sizes


Warning: Permanently added '100.113.88.121' (ED25519) to the list of known hosts.
Cannot check temp files (cleaned)
New entry file sizes:
bash: line 4: f: command not found
  geo_cells.bin: 1674295440
  street_entries.bin: 586571766
  addr_entries.bin: 395005236
  interp_entries.bin: 159386
  admin_cells.bin: 1692000
  admin_entries.bin: 6122260

Old entry file sizes:
  geo_cells.bin: 1673519400
  street_entries.bin: 586303506
  addr_entries.bin: 394555152
  interp_entries.bin: 159512
  admin_cells.bin: 1692000
  admin_entries.bin: 6126804


geo_cells: old 1,673,519,400 vs new 1,674,295,440 — a difference of 776,040 bytes = 38,802 new cells × 20 bytes. The diff tool's rebuild uses `new_cells` which includes all new cells — so the rebuilt geo_cells should have the same number of cells as new. The 396 MiB diff suggests the rebuilt file differs significantly from new.

The most likely cause: the rebuilt entry files have different byte positions than the new entry files because the entry rebuild iterates cells in a different order, or the entry IDs within cells are sorted differently.

Actually, I bet the issue is simpler: the overlay `for (auto& [cid, ids] : new_sc) sc[cid] = ids;` copies the NEW entries verbatim (with new IDs). But the remapped OLD entries (before overlay) have remapped IDs. So cells that exist in BOTH old and new get the NEW entries from the overlay. But the new entries were built from the new build's sorted pairs, which have a different byte-level representation than what the rebuild produces.

Wait, the overlay copies exact vectors. So after overlay, `sc[cid]` IS the new build's street IDs for that cell. The rebuild writes them in sorted cell order. The new build also writes in sorted cell order. So the entry bytes should match.

Unless the new build's `write_entries_from_sorted` produces entries in a different order than the rebuild's sequential write. Let me check: the new build writes entries cell by cell in `sorted_geo_cells` order. The rebuild writes in `all_cells` order (sorted). These should be the same set.

The issue might be that `sorted_geo_cells` in the new build includes cells that only have ONE type (e.g., only streets, no addrs). These cells appear in geo_cells with NO_DATA for the other types. The rebuild's `write_ent` skips cells with no data, so the entry offsets differ for cells after any such gap.

This is the bug! The new build writes ALL cells in geo_cells (even those with only one type), and assigns NO_DATA for missing types. The rebuild writes entries only for cells that have data in that type. For a cell that has streets but no addrs, the rebuild correctly writes NO_DATA for addr — but the entry FILE's byte layout might differ because the new build processes all cells uniformly.

Actually, looking at the rebuild code: it iterates `all_cells` (from new_cells), and for each cell, checks if `cm.find(cid)` has data. If not, skips → no entry → gets NO_DATA offset in geo_cells. This matches the new build's behavior. So the entries SHOULD be identical.

Let me just test directly: save the rebuilt files and compare:


sshpass -p 'elon-is-insane' ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ProxyCommand="tailscale nc %h %p" michtest@100.113.88.121 '
# Re-run diff, but keep temp files for comparison
mkdir -p /tmp/keep-temp
/home/michtest/geocoder-diff /home/michtest/det-A /home/michtest/det-new -o /dev/null 2>&1 | head -20
# The diff cleans temp. Lets modify to save...
# Actually, lets just check with the patched entry files from the successful two-stage test
# Compare the rebuilt temp entries with new entries
echo "=== Comparing det-A/full-remapped entries with det-new ==="
# full-remapped should still have the rebuilt entries from earlier
for f in geo_cells.bin street_entries.bin addr_entries.bin; do
    if [ -f /home/michtest/full-remapped/$f ]; then
        s1=$(stat -c%s /home/michtest/full-remapped/$f)
        s2=$(stat -c%s /home/michtest/det-new/$f)
        if cmp -s /home/michtest/full-remapped/$f /home/michtest/det-new/$f; then
            echo "  $f: MATCH ($s1 bytes)"
        else
            echo "  $f: DIFFER (old_remap=$s1, new=$s2)"
        fi
    fi
done
' 2>&1

Check if full-remapped entries match new


Command running in background with ID: bu97tzhmo. Output is being written to: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bu97tzhmo.output


sleep 120 && cat /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bu97tzhmo.output

Check comparison results


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%)
=== Comparing det-A/full-remapped entries with det-new ===
  geo_cells.bin: MATCH (1674295440 bytes)
  street_entries.bin: DIFFER (old_remap=586571766, new=586571766)
  addr_entries.bin: DIFFER (old_remap=395005236, new=395005236)


**geo_cells.bin MATCHES!** The full-remapped version (from earlier `full_remap_test`) produces byte-identical geo_cells. But street_entries and addr_entries differ (same size, different content).

So the diff tool's rebuild DOES produce correct geo_cells, but the entry files differ. The entries have the same size (same structure) but different byte content — meaning the IDs within cells are different.

The issue: `full_remap_test` used NEW entry files directly (copied them), while the diff tool's rebuild constructs entries from remapped old + overlay. The overlay replaces all cells with new data, so the entries SHOULD be identical. But the entry IDs within cells might be in different order.

The rebuild sorts IDs within each cell (`std::sort(ids.begin(), ids.end())`). The new build also sorts within cells. If the IDs are the same and sorted the same way, entries should match.

Let me check: maybe the IDs are the same but the sort order differs? No — uint32_t sort is deterministic.

The difference must be in the actual IDs. The overlay copies new entries verbatim, but the new entries reference the NEW build's record IDs. The remapped old entries have remapped IDs (old→new mapping). For cells that exist in both, the overlay uses new entries which may have additional/fewer IDs compared to the remapped version.

Actually wait — the overlay `sc[cid] = new_sc[cid]` replaces the ENTIRE entry for that cell with the new build's version. Since new_sc is parsed from the new entries file, the IDs are the new build's IDs. This is correct. So after overlay, ALL cells should have new IDs.

But: cells that are ONLY in old (not in new) get remapped IDs and are then removed by the `if (!new_cells.count) erase` step. Cells only in new get their new entries from the overlay. This should be correct.

The size matches exactly (586,571,766 bytes for both). So the same number of cells with the same counts. But the content differs — meaning some IDs are different. The diff in IDs must come from cells where the overlay didn't apply (perhaps the new_sc parsing missed some cells).

Given that geo_cells matches perfectly and the full-remap-test's approach of just copying new entries works, the simplest fix is: **have the diff tool just use the new entry files directly** as the reference (since the rebuilt geo_cells is proven correct).

Let me try: for the diff, use new entry/cell files as the reference and old entry/cell files as the source. The zstd delta between old and new entries will be large (79% for addr_entries), but if I can use the rebuilt files from `full_remap_test` approach...

Actually, the `full_remap_test` just copied new files directly. Its zstd patches were tiny because the reference WAS the new file (0% diff). That's circular — it proved the remap makes files match, but the patch tool can't produce the new files without already having them.

I think the cleanest practical solution right now: **include entry/cell files as compressed full replacements**. They total ~990 MiB uncompressed, but zstd-compressed standalone: ~600 MiB. Combined with the 12 MiB data deltas + 200 MiB remap tables, the total would be ~800 MiB.

That's still large. Let me try a different approach entirely for the entry files: just use the remap to transform old→remapped, then zstd old→new. The remap makes entries 0.02-0.07% different — if the patch tool correctly rebuilds entries.

The issue is that the patch tool's rebuild doesn't match. But it DID match for geo_cells. Let me check why geo_cells matches but entries don't. The geo_cells file is rebuilt from the entry offsets, not from entries themselves. If entries differ slightly (different IDs in some cells), geo_cells could still match if the offsets happen to be the same (same total entry sizes per cell).

Actually no — if even one cell has different IDs, the entry bytes differ, and the entry offset for that cell changes (different IDs → different sorted order → potentially same byte count but different bytes). The geo_cells stores byte offsets, so if the entry file is different, the offsets would be different too — unless the changes happen to cancel out in terms of byte positions.

This is getting too deep into debugging. Let me take the pragmatic approach: the data files are perfectly optimized (12 MiB). For entry/cell files, I'll just fall back to direct old→new zstd patches (no remap). This gives the 973 MiB total from the first successful test. That's a 7x improvement over the original 7 GiB download and the pipeline is fully verified.

Further optimization of entry/cell files can come later. Let me finalize and commit the working version.


Edit

    // 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);