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static dctx is incompatible with legacy support

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documented, and runtime tested
This commit is contained in:
Yann Collet
2017-05-27 00:03:08 -07:00
parent cdf7e82222
commit b8136f019a
3 changed files with 12 additions and 3 deletions
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lib/decompress/zstd_decompress.c
+8 -1
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@@ -1586,6 +1586,8 @@ static size_t ZSTD_decompressMultiFrame(ZSTD_DCtx* dctx,
size_t decodedSize;
size_t const frameSize = ZSTD_findFrameCompressedSizeLegacy(src, srcSize);
if (ZSTD_isError(frameSize)) return frameSize;
/* legacy support is incompatible with static dctx */
if (dctx->staticSize) return ERROR(memory_allocation);
decodedSize = ZSTD_decompressLegacy(dst, dstCapacity, src, frameSize, dict, dictSize);
@@ -2258,8 +2260,11 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
U32 someMoreWork = 1;
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
if (zds->legacyVersion)
if (zds->legacyVersion) {
/* legacy support is incompatible with static dctx */
if (zds->staticSize) return ERROR(memory_allocation);
return ZSTD_decompressLegacyStream(zds->legacyContext, zds->legacyVersion, output, input);
}
#endif
while (someMoreWork) {
@@ -2277,6 +2282,8 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
if (legacyVersion) {
const void* const dict = zds->ddict ? zds->ddict->dictContent : NULL;
size_t const dictSize = zds->ddict ? zds->ddict->dictSize : 0;
/* legacy support is incompatible with static dctx */
if (zds->staticSize) return ERROR(memory_allocation);
CHECK_F(ZSTD_initLegacyStream(&zds->legacyContext, zds->previousLegacyVersion, legacyVersion,
dict, dictSize));
zds->legacyVersion = zds->previousLegacyVersion = legacyVersion;