Return server status + version. Always status: OK — re-binary-diff has no external system dependencies.

Compute a unified-style diff between path_a and path_b.

For small files (<= 8 MiB per side) the function runs difflib.unified_diff over the byte streams (decoded as latin-1). For large files it falls back to a per-chunk SHA-256 diff.

Args: path_a: first file (the "before" or "original") path_b: second file (the "after" or "patched")

Returns::

{
  "path_a": "...",
  "path_b": "...",
  "size_a": N,
  "size_b": N,
  "mode": "sha256_equal" | "inline_unified_diff" | "chunk_sha256_diff",
  "equal": bool,
  "diff_lines": ["...", ...],   (inline mode)
  "chunk_diff": [{...}, ...],   (chunk mode)
}

The function is read-only. The "patched" copy at path_b is not modified.

Return a per-chunk SHA-256 + offset + size fingerprint of path.

Useful for finding the structural delta between two versions of a binary without loading either into memory. Pair with unified_diff (chunk mode) for large files.

Args: path: file to fingerprint chunk_size: bytes per chunk (default 1 MiB) max_chunks: 0 = no cap; > 0 = return at most N chunks

Returns::

{
  "path": "...",
  "size": N,
  "chunk_size": N,
  "truncated": bool,
  "chunks": [
    {"index": 0, "offset": 0, "size": 1048576, "sha256": "..."},
    ...
  ],
}