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feat: add delta transfer for incremental sync #22

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TapTap merged 3 commits from feature/delta-transfer into main 2026-07-19 15:51:27 +02:00
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3 Commits
Author SHA1 Message Date
TapTap 12557c351c refactor: replace vendored xxhash.h with CMake FetchContent dependency
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Remove 7490-line vendored xxhash.h, use FetchContent to pull xxHash v0.8.3
at CMake configure time (SOURCE_SUBDIR cmake_unofficial). Links as static
library via the xxhash target.
 2026-07-19 15:21:35 +02:00
TapTap 598e4e7514 fix: address PR review - rolling adler32, extract helpers, configurable max file size
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- Fix rolling adler32: add missing -1 in s2 update formula (was producing
  wrong checksums, causing zero block matches)
- Fix file_send_sendfile signature to match typedef (add unused
  compression_level param)
- Extract receive_delta_file() from receive_incremental_check() to reduce
  nesting depth
- Extract send_file_incremental() helper in client_send.c
- Add delta_max_file_size to Config, serialized over wire
- Add --delta-max CLI flag
- Add test_large_file_delta (200KB) and extra delta_should_attempt cases
- Remove unused pos_in_block variable from delta_compute
 2026-07-19 02:02:28 +02:00
TapTap e16db56580 feat: add delta transfer for incremental sync
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Implement rsync-style delta transfer using rolling checksums (Adler-32 +
xxHash32). When a file exists on both sides but has changed, only the
changed blocks are transmitted instead of the entire file.

- New status codes: STATUS_DELTA_SIGNATURE, STATUS_DELTA_DATA
- Protocol version bumped to 1.2.0
- Server generates block signature, client computes delta
- Auto-fallback to whole-file when delta >= 70% of file size
- Works with zstd compression on delta stream
- Configurable block size (default 8KB, --delta-block flag)
- 13 unit tests covering hashing, signature roundtrip, delta compute/apply,
  file growth/shrink, and decision logic
 2026-07-18 20:00:15 +02:00