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JakubandClaude Opus 5.5
0bbf2fa2b3
Each point keeps the GPS altitude in what was padding, so a point stays 16 bytes. The save format goes to version 2; version 1 files still load, with the altitude unknown. GPX export writes <ele>. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
45 lines
2.1 KiB
C++
45 lines
2.1 KiB
C++
#pragma once
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// Shared on-disk header for the small fixed-table snapshots (waypoints, trail).
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// Layout: magic(4) + version(1) + reserved(1) + count(2), little-endian, then
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// table-specific payload (records, and for the trail an extra accumulated-ms
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// field). Keeps the read/write boilerplate — and its short-read checks — in one
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// place so both stores can't drift apart.
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#include <Arduino.h>
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namespace persist {
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// Write magic(4) + version(1) + reserved(1) + count(2). Returns true on a full write.
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template <typename F>
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inline bool writeHeader(F& file, uint32_t magic, uint8_t version, uint16_t count) {
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uint8_t res = 0;
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return file.write((uint8_t*)&magic, sizeof(magic)) == sizeof(magic)
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&& file.write(&version, 1) == 1
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&& file.write(&res, 1) == 1
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&& file.write((uint8_t*)&count, sizeof(count)) == sizeof(count);
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}
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// Read + validate the header. Returns true and sets count_out only when magic
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// and version match. The caller decides how to treat count_out (clamp or
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// reject against its own capacity) and reads any table-specific fields that
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// follow the count.
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template <typename F>
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// `min_version` > 0 also takes the older versions from it up to expect_version,
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// the one read going to *version_out.
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inline bool readHeader(F& file, uint32_t expect_magic, uint8_t expect_version, uint16_t& count_out,
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uint8_t min_version = 0, uint8_t* version_out = nullptr) {
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uint32_t magic = 0;
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if (file.read((uint8_t*)&magic, sizeof(magic)) != (int)sizeof(magic)) return false;
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if (magic != expect_magic) return false;
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uint8_t ver = 0, res = 0;
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uint16_t cnt = 0;
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if (file.read(&ver, 1) != 1) return false;
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if (file.read(&res, 1) != 1) return false;
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if (file.read((uint8_t*)&cnt, sizeof(cnt)) != (int)sizeof(cnt)) return false;
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if (ver > expect_version || ver < (min_version ? min_version : expect_version)) return false;
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if (version_out) *version_out = ver;
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count_out = cnt;
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return true;
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}
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} // namespace persist
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