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improve ZSTD_getFrameHeader on skippable frames

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now reports:
- the header size
- the magic variant (within @dictID field)
This commit is contained in:
Yann Collet
2024-12-29 12:26:04 -08:00
parent f8a2b352d6
commit a2ff6ea784
4 changed files with 28 additions and 13 deletions
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tests/fuzzer.c
+17 -4
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@@ -4111,15 +4111,28 @@ static int basicUnitTests(U32 const seed, double compressibility)
/* frame operations on skippable frames */
{ const char skippableFrame[] = "\x50\x2a\x4d\x18\x05\x0\x0\0abcde";
size_t const skippableFrameSize = sizeof(skippableFrame) - 1 /* remove final /0 */;
{ const char skippableFrame[] = "\x52\x2a\x4d\x18\x05\x0\x0\0abcde";
size_t const skippableFrameSize = sizeof(skippableFrame) - 1 /* remove the terminating /0 */;
DISPLAYLEVEL(3, "test%3i : ZSTD_findFrameCompressedSize on skippable frame : ", testNb++);
if (ZSTD_findFrameCompressedSize(skippableFrame, skippableFrameSize) != skippableFrameSize) goto _output_error;
CHECK(ZSTD_findFrameCompressedSize(skippableFrame, skippableFrameSize) == skippableFrameSize);
DISPLAYLEVEL(3, "OK \n");
DISPLAYLEVEL(3, "test%3i : ZSTD_getFrameContentSize on skippable frame : ", testNb++);
if (ZSTD_getFrameContentSize(skippableFrame, skippableFrameSize) != 0) goto _output_error;
CHECK(ZSTD_getFrameContentSize(skippableFrame, skippableFrameSize) == 0);
DISPLAYLEVEL(3, "OK \n");
DISPLAYLEVEL(3, "test%3i : ZSTD_getFrameHeader on skippable frame : ", testNb++);
{ ZSTD_frameHeader zfh;
size_t const s = ZSTD_getFrameHeader(&zfh, skippableFrame, skippableFrameSize);
CHECK_Z(s);
CHECK(s == 0); /* success */
CHECK(zfh.frameType == ZSTD_skippableFrame);
CHECK(zfh.headerSize == ZSTD_SKIPPABLEHEADERSIZE);
CHECK(zfh.dictID == 2); /* magic variant */
assert(skippableFrameSize >= ZSTD_SKIPPABLEHEADERSIZE);
CHECK(zfh.frameContentSize == skippableFrameSize - ZSTD_SKIPPABLEHEADERSIZE);
}
DISPLAYLEVEL(3, "OK \n");
}