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/*
** Copyright (c) 2018-2020 Valve Corporation
** Copyright (c) 2018-2020 LunarG, Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and associated documentation files (the "Software"),
** to deal in the Software without restriction, including without limitation
** the rights to use, copy, modify, merge, publish, distribute, sublicense,
** and/or sell copies of the Software, and to permit persons to whom the
** Software is furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
** FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
** DEALINGS IN THE SOFTWARE.
*/
#ifdef ENABLE_ZLIB_COMPRESSION
#include "util/zlib_compressor.h"
#include "zlib.h"
GFXRECON_BEGIN_NAMESPACE(gfxrecon)
GFXRECON_BEGIN_NAMESPACE(util)
size_t ZlibCompressor::Compress(const size_t uncompressed_size,
const uint8_t* uncompressed_data,
std::vector<uint8_t>* compressed_data,
size_t compressed_data_offset)
{
size_t copy_size = 0;
if (nullptr == compressed_data)
{
return 0;
}
if (compressed_data->size() < (compressed_data_offset + uncompressed_size))
{
compressed_data->resize(compressed_data_offset + uncompressed_size);
}
z_stream compress_stream = {};
compress_stream.zalloc = Z_NULL;
compress_stream.zfree = Z_NULL;
compress_stream.opaque = Z_NULL;
GFXRECON_CHECK_CONVERSION_DATA_LOSS(uInt, uncompressed_size);
compress_stream.avail_in = static_cast<uInt>(uncompressed_size);
compress_stream.next_in = const_cast<Bytef*>(uncompressed_data);
GFXRECON_CHECK_CONVERSION_DATA_LOSS(uInt, compressed_data->size());
compress_stream.avail_out = static_cast<uInt>(compressed_data->size());
compress_stream.next_out = compressed_data->data() + compressed_data_offset;
// Perform the compression (deflate the data).
deflateInit(&compress_stream, Z_BEST_COMPRESSION);
deflate(&compress_stream, Z_FINISH);
deflateEnd(&compress_stream);
// Determine the size of data from the stream
copy_size = compress_stream.total_out;
return copy_size;
}
size_t ZlibCompressor::Decompress(const size_t compressed_size,
const std::vector<uint8_t>& compressed_data,
const size_t expected_uncompressed_size,
std::vector<uint8_t>* uncompressed_data)
{
size_t copy_size = 0;
if (nullptr == uncompressed_data)
{
return 0;
}
z_stream decompress_stream = {};
decompress_stream.zalloc = Z_NULL;
decompress_stream.zfree = Z_NULL;
decompress_stream.opaque = Z_NULL;
GFXRECON_CHECK_CONVERSION_DATA_LOSS(uInt, compressed_size);
decompress_stream.avail_in = static_cast<uInt>(compressed_size);
decompress_stream.next_in = const_cast<Bytef*>(compressed_data.data());
GFXRECON_CHECK_CONVERSION_DATA_LOSS(uInt, expected_uncompressed_size);
decompress_stream.avail_out = static_cast<uInt>(expected_uncompressed_size);
decompress_stream.next_out = uncompressed_data->data();
// Perform the decompression (inflate the data).
inflateInit(&decompress_stream);
inflate(&decompress_stream, Z_NO_FLUSH);
inflateEnd(&decompress_stream);
// Determine the size of data from the stream
copy_size = decompress_stream.total_out;
return copy_size;
}
GFXRECON_END_NAMESPACE(util)
GFXRECON_END_NAMESPACE(gfxrecon)
#endif // ENABLE_ZLIB_COMPRESSION
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