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shim: improve overconsumption workaround

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Fix issue: #369

Signed-off-by: Veronika Karpenko <veronika.karpenko@intel.com>
This commit is contained in:
Veronika Karpenko
2025-11-04 17:06:22 +00:00
committed by Pablo de Lara
parent b93efe5a43
commit e6db28bf03
1 changed files with 5 additions and 20 deletions
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25
igzip/shim/shim_inflate.c
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@@ -167,12 +167,9 @@ inflate(z_streamp strm, int flush)
#endif
// WORKAROUND: ISA-L over-consumption fix for raw deflate mode
// When ISA-L reaches BLOCK_FINISH in raw deflate mode, it sometimes over-consumes
// input data that should be left for upper-layer protocol handling (like gzip trailer).
// 8 bytes have to remain for the gzip trailer.
// Only apply this fix once per stream, when we're truly at the end.
if (isal_strm_inflate->block_state == ISAL_BLOCK_FINISH &&
isal_strm_inflate->crc_flag == 0 && // raw deflate mode
if ((isal_strm_inflate->block_state == ISAL_BLOCK_FINISH ||
isal_strm_inflate->block_state == ISAL_BLOCK_INPUT_DONE) &&
(isal_strm_inflate->crc_flag == 0) && // raw deflate
s->trailer_overconsumption_fixed == 0 && // hasn't been applied yet
decomp == ISAL_DECOMP_OK && // successful decompression
isal_strm_inflate->avail_in < 8 && isal_strm_inflate->avail_in > 0) {
@@ -224,22 +221,10 @@ inflate(z_streamp strm, int flush)
if (decomp == ISAL_DECOMP_OK) {
if (isal_strm_inflate->block_state == ISAL_BLOCK_FINISH) {
// ISA-L has finished processing the deflate stream AND any format-specific
// trailers
// ISA-L has finished processing the deflate stream including trailer
// validation
ret = Z_STREAM_END;
strm->msg = "ok";
} else if (strm->avail_out == 0) {
// Output buffer is full, but stream may not be complete
ret = Z_OK;
} else if (strm->avail_in == 0) {
// No more input available
if (isal_strm_inflate->block_state == ISAL_BLOCK_FINISH) {
// Stream is actually complete - ISA-L has reached final state
ret = Z_STREAM_END;
} else {
// ISA-L still needs more input to finish processing
ret = Z_OK;
}
} else {
// Still processing, continue
ret = Z_OK;