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/*
* Bzip2 Compressor
* (C) 2001 Peter J Jones
* 2001-2007,2014 Jack Lloyd
* 2006 Matt Johnston
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/bzip2.h>
#include <botan/exceptn.h>
#include <botan/internal/compress_utils.h>
#define BZ_NO_STDIO
#include <bzlib.h>
namespace Botan {
namespace {
class Bzip2_Stream : public Zlib_Style_Stream<bz_stream, char>
{
public:
Bzip2_Stream()
{
streamp()->opaque = alloc();
streamp()->bzalloc = Compression_Alloc_Info::malloc<int>;
streamp()->bzfree = Compression_Alloc_Info::free;
}
uint32_t run_flag() const override { return BZ_RUN; }
uint32_t flush_flag() const override { return BZ_FLUSH; }
uint32_t finish_flag() const override { return BZ_FINISH; }
};
class Bzip2_Compression_Stream final : public Bzip2_Stream
{
public:
explicit Bzip2_Compression_Stream(size_t block_size)
{
/*
* Defaults to 900k blocks as the computation cost of
* compression is not overly affected by the size, though
* more memory is required.
*/
if(block_size == 0 || block_size >= 9)
block_size = 9;
int rc = BZ2_bzCompressInit(streamp(), block_size, 0, 0);
if(rc == BZ_MEM_ERROR)
throw Exception("bzip memory allocation failure");
else if(rc != BZ_OK)
throw Exception("bzip compress initialization failed");
}
~Bzip2_Compression_Stream()
{
BZ2_bzCompressEnd(streamp());
}
bool run(uint32_t flags) override
{
int rc = BZ2_bzCompress(streamp(), flags);
if(rc == BZ_MEM_ERROR)
throw Exception("bzip memory allocation failure");
else if(rc < 0)
throw Exception("bzip compress error " + std::to_string(-rc));
return (rc == BZ_STREAM_END);
}
};
class Bzip2_Decompression_Stream final : public Bzip2_Stream
{
public:
Bzip2_Decompression_Stream()
{
int rc = BZ2_bzDecompressInit(streamp(), 0, 0);
if(rc == BZ_MEM_ERROR)
throw Exception("bzip memory allocation failure");
else if(rc != BZ_OK)
throw Exception("bzip decompress initialization failed");
}
~Bzip2_Decompression_Stream()
{
BZ2_bzDecompressEnd(streamp());
}
bool run(uint32_t) override
{
int rc = BZ2_bzDecompress(streamp());
if(rc == BZ_MEM_ERROR)
throw Exception("bzip memory allocation failure");
else if(rc != BZ_OK && rc != BZ_STREAM_END)
throw Exception("bzip decompress error " + std::to_string(-rc));
return (rc == BZ_STREAM_END);
}
};
}
Compression_Stream* Bzip2_Compression::make_stream(size_t comp_level) const
{
return new Bzip2_Compression_Stream(comp_level);
}
Compression_Stream* Bzip2_Decompression::make_stream() const
{
return new Bzip2_Decompression_Stream;
}
}
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