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Issue #1288 - Part 2: Add a partial LZ4 decompression routine.

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This function never writes beyond `aDest` + `aMaxOutputSize`, and is
therefore protexted against malicious datapackets.
It also ignores unconsumed input upon reaching `aMaxOutputSize` and can
therefore be used for parial decompression of LZ4 input up to a desired
resulting size of decompressed data.
This commit is contained in:
wolfbeast 2019-11-14 09:51:07 +01:00 • committed by Roy Tam
commit da2e08390c
2 changed files with 44 additions and 0 deletions
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21
mfbt/Compression.cpp
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@ -76,3 +76,24 @@ LZ4::decompress(const char* aSource, size_t aInputSize, char* aDest,
return false;
}
bool
LZ4::decompressPartial(const char* aSource, size_t aInputSize, char* aDest,
size_t aMaxOutputSize, size_t* aOutputSize)
{
CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
MOZ_ASSERT(maxOutputSizeChecked.isValid());
CheckedInt<int> inputSizeChecked = aInputSize;
MOZ_ASSERT(inputSizeChecked.isValid());
int ret = LZ4_decompress_safe_partial(aSource, aDest,
inputSizeChecked.value(),
maxOutputSizeChecked.value(),
maxOutputSizeChecked.value());
if (ret >= 0) {
*aOutputSize = ret;
return true;
}
*aOutputSize = 0;
return false;
}