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test-tool synthesize: add precomputed SHA-256 pack for 4 GiB + 1
Add a SHA-256 entry to the fast_packs[] table. The pack prefix and deflate block structure are identical to SHA-1 (the pack format does not encode the hash algorithm in its header). Only the suffix differs: SHA-256 OIDs are 32 bytes instead of 20, giving a 609-byte suffix compared to 513 for SHA-1, and a different pack checksum. The constants were generated by running the generic path inside a repository initialized with --object-format=sha256. Assisted-by: Claude Opus 4.6 Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin
committed by
Junio C Hamano
Junio C Hamano
parent
ad6ae3648a
commit
f549253b0b
@@ -246,6 +246,90 @@ static const unsigned char fast_pack_sha1_suffix[] = {
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0xe3
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};
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/*
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* SHA-256 suffix: same structure, but with 32-byte OIDs and SHA-256
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* pack checksum (609 bytes vs 513 for SHA-1).
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*/
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static const unsigned char fast_pack_sha256_suffix[] = {
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0xc9
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};
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static const struct fast_pack fast_packs[] = {
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{
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.format_id = GIT_SHA1_FORMAT_ID,
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@@ -253,6 +337,13 @@ static const struct fast_pack fast_packs[] = {
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.suffix_len = sizeof(fast_pack_sha1_suffix),
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.commit_oid = "aac43daf40d0377af31aa9c798a4ae8a31b55c1d",
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},
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{
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.format_id = GIT_SHA256_FORMAT_ID,
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.suffix = fast_pack_sha256_suffix,
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.suffix_len = sizeof(fast_pack_sha256_suffix),
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.commit_oid = "63c46ca51267b1d45be69a044bb84b4bf0559f09"
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"d727f861d2ae94ddebdddbc9",
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},
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};
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/*
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