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Fixed output size and removed unneeded loop

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Summary: In Zlib_Compress and BZip2_Compress the calculation for size was slightly off when using compression_foramt_version 2 (which includes the decompressed size in the output).  Also there were unnecessary loops around the deflate/BZ2_bzCompress calls.  In Zlib_Compress there was also a possible exit from the function after calling deflateInit2 that didn't call deflateEnd.

Test Plan: Standard tests

Reviewers: sdong, IslamAbdelRahman, igor

Reviewed By: igor

Subscribers: sdong, IslamAbdelRahman, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D60537
This commit is contained in:
Jay Edgar 2016-07-08 10:52:25 -07:00
parent 6ea41f8527
commit 15b7a4ab88
1 changed files with 19 additions and 34 deletions
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49
util/compression.h
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@ -237,6 +237,7 @@ inline bool Zlib_Compress(const CompressionOptions& opts,
&_stream, reinterpret_cast<const Bytef*>(compression_dict.data()),
static_cast<unsigned int>(compression_dict.size()));
if (st != Z_OK) {
deflateEnd(&_stream);
return false;
}
}
@ -249,27 +250,18 @@ inline bool Zlib_Compress(const CompressionOptions& opts,
_stream.avail_out = static_cast<unsigned int>(length);
_stream.next_out = reinterpret_cast<Bytef*>(&(*output)[output_header_len]);
bool done = false;
while (!done) {
bool compressed = false;
st = deflate(&_stream, Z_FINISH);
switch (st) {
case Z_STREAM_END:
done = true;
break;
case Z_OK:
// No output space. This means the compression is bigger than
// decompressed size. Just fail the compression in that case.
// Intentional fallback (to failure case)
case Z_BUF_ERROR:
default:
deflateEnd(&_stream);
return false;
}
if (st == Z_STREAM_END) {
compressed = true;
output->resize(output->size() - _stream.avail_out);
}
// The only return value we really care about is Z_STREAM_END.
// Z_OK means insufficient output space. This means the compression is
// bigger than decompressed size. Just fail the compression in that case.
output->resize(output->size() - _stream.avail_out + output_header_len);
deflateEnd(&_stream);
return true;
return compressed;
#endif
return false;
}
@ -416,25 +408,18 @@ inline bool BZip2_Compress(const CompressionOptions& opts,
_stream.avail_out = static_cast<unsigned int>(length);
_stream.next_out = reinterpret_cast<char*>(&(*output)[output_header_len]);
while (_stream.next_in != nullptr && _stream.avail_in != 0) {
bool compressed = false;
st = BZ2_bzCompress(&_stream, BZ_FINISH);
switch (st) {
case BZ_STREAM_END:
break;
case BZ_FINISH_OK:
// No output space. This means the compression is bigger than
// decompressed size. Just fail the compression in that case
// Intentional fallback (to failure case)
case BZ_SEQUENCE_ERROR:
default:
BZ2_bzCompressEnd(&_stream);
return false;
}
if (st == BZ_STREAM_END) {
compressed = true;
output->resize(output->size() - _stream.avail_out);
}
// The only return value we really care about is BZ_STREAM_END.
// BZ_FINISH_OK means insufficient output space. This means the compression
// is bigger than decompressed size. Just fail the compression in that case.
output->resize(output->size() - _stream.avail_out + output_header_len);
BZ2_bzCompressEnd(&_stream);
return true;
return compressed;
#endif
return false;
}