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add explanation about new test

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as requested by @terrelln
This commit is contained in:
Yann Collet
2023-01-12 15:49:01 -08:00
parent 796699c0bc
commit ac45e078a5
1 changed files with 5 additions and 0 deletions
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lib/compress/zstd_compress_literals.c
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@@ -187,6 +187,11 @@ size_t ZSTD_compressLiterals (
return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize); return ZSTD_noCompressLiterals(dst, dstCapacity, src, srcSize);
} } } }
if (cLitSize==1) { if (cLitSize==1) {
/* A return value of 1 signals that the alphabet consists of a single symbol.
* However, in some rare circumstances, it could be the compressed size (a single byte).
* For that outcome to have a chance to happen, it's necessary that `srcSize < 8`.
* (it's also necessary to not generate statistics).
* Therefore, in such a case, actively check that all bytes are identical. */
if ((srcSize >= 8) || allBytesIdentical(src, srcSize)) { if ((srcSize >= 8) || allBytesIdentical(src, srcSize)) {
ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf)); ZSTD_memcpy(nextHuf, prevHuf, sizeof(*prevHuf));
return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize); return ZSTD_compressRleLiteralsBlock(dst, dstCapacity, src, srcSize);