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/*************************************************
* Bzip Compressor Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/bzip2.h>
#include <map>
#include <cstring>
#define BZ_NO_STDIO
#include <bzlib.h>
namespace Botan {
namespace {
/*************************************************
* Allocation Information for Bzip *
*************************************************/
class Bzip_Alloc_Info
{
public:
std::map<void*, u32bit> current_allocs;
Allocator* alloc;
Bzip_Alloc_Info() { alloc = Allocator::get(false); }
};
/*************************************************
* Allocation Function for Bzip *
*************************************************/
void* bzip_malloc(void* info_ptr, int n, int size)
{
Bzip_Alloc_Info* info = static_cast<Bzip_Alloc_Info*>(info_ptr);
void* ptr = info->alloc->allocate(n * size);
info->current_allocs[ptr] = n * size;
return ptr;
}
/*************************************************
* Allocation Function for Bzip *
*************************************************/
void bzip_free(void* info_ptr, void* ptr)
{
Bzip_Alloc_Info* info = static_cast<Bzip_Alloc_Info*>(info_ptr);
std::map<void*, u32bit>::const_iterator i = info->current_allocs.find(ptr);
if(i == info->current_allocs.end())
throw Invalid_Argument("bzip_free: Got pointer not allocated by us");
info->alloc->deallocate(ptr, i->second);
}
}
/*************************************************
* Wrapper Type for Bzip2 Stream *
*************************************************/
class Bzip_Stream
{
public:
bz_stream stream;
Bzip_Stream()
{
std::memset(&stream, 0, sizeof(bz_stream));
stream.bzalloc = bzip_malloc;
stream.bzfree = bzip_free;
stream.opaque = new Bzip_Alloc_Info;
}
~Bzip_Stream()
{
Bzip_Alloc_Info* info = static_cast<Bzip_Alloc_Info*>(stream.opaque);
delete info;
std::memset(&stream, 0, sizeof(bz_stream));
}
};
/*************************************************
* Bzip_Compression Constructor *
*************************************************/
Bzip_Compression::Bzip_Compression(u32bit l) :
level((l >= 9) ? 9 : l), buffer(DEFAULT_BUFFERSIZE)
{
bz = 0;
}
/*************************************************
* Start Compressing with Bzip *
*************************************************/
void Bzip_Compression::start_msg()
{
clear();
bz = new Bzip_Stream;
if(BZ2_bzCompressInit(&(bz->stream), level, 0, 0) != BZ_OK)
throw Exception("Bzip_Compression: Memory allocation error");
}
/*************************************************
* Compress Input with Bzip *
*************************************************/
void Bzip_Compression::write(const byte input[], u32bit length)
{
bz->stream.next_in = (char*)input;
bz->stream.avail_in = length;
while(bz->stream.avail_in != 0)
{
bz->stream.next_out = (char*)buffer.begin();
bz->stream.avail_out = buffer.size();
BZ2_bzCompress(&(bz->stream), BZ_RUN);
send(buffer, buffer.size() - bz->stream.avail_out);
}
}
/*************************************************
* Finish Compressing with Bzip *
*************************************************/
void Bzip_Compression::end_msg()
{
bz->stream.next_in = 0;
bz->stream.avail_in = 0;
int rc = BZ_OK;
while(rc != BZ_STREAM_END)
{
bz->stream.next_out = (char*)buffer.begin();
bz->stream.avail_out = buffer.size();
rc = BZ2_bzCompress(&(bz->stream), BZ_FINISH);
send(buffer, buffer.size() - bz->stream.avail_out);
}
clear();
}
/*************************************************
* Flush the Bzip Compressor *
*************************************************/
void Bzip_Compression::flush()
{
bz->stream.next_in = 0;
bz->stream.avail_in = 0;
int rc = BZ_OK;
while(rc != BZ_RUN_OK)
{
bz->stream.next_out = (char*)buffer.begin();
bz->stream.avail_out = buffer.size();
rc = BZ2_bzCompress(&(bz->stream), BZ_FLUSH);
send(buffer, buffer.size() - bz->stream.avail_out);
}
}
/*************************************************
* Clean up Compression Context *
*************************************************/
void Bzip_Compression::clear()
{
if(!bz) return;
BZ2_bzCompressEnd(&(bz->stream));
delete bz;
bz = 0;
}
/*************************************************
* Bzip_Decompression Constructor *
*************************************************/
Bzip_Decompression::Bzip_Decompression(bool s) :
small_mem(s), buffer(DEFAULT_BUFFERSIZE)
{
no_writes = true;
bz = 0;
}
/*************************************************
* Decompress Input with Bzip *
*************************************************/
void Bzip_Decompression::write(const byte input[], u32bit length)
{
if(length) no_writes = false;
bz->stream.next_in = (char*)input;
bz->stream.avail_in = length;
while(bz->stream.avail_in != 0)
{
bz->stream.next_out = (char*)buffer.begin();
bz->stream.avail_out = buffer.size();
int rc = BZ2_bzDecompress(&(bz->stream));
if(rc != BZ_OK && rc != BZ_STREAM_END)
{
clear();
if(rc == BZ_DATA_ERROR)
throw Decoding_Error("Bzip_Decompression: Data integrity error");
if(rc == BZ_DATA_ERROR_MAGIC)
throw Decoding_Error("Bzip_Decompression: Invalid input");
if(rc == BZ_MEM_ERROR)
throw Exception("Bzip_Decompression: Memory allocation error");
throw Exception("Bzip_Decompression: Unknown decompress error");
}
send(buffer, buffer.size() - bz->stream.avail_out);
if(rc == BZ_STREAM_END)
{
u32bit read_from_block = length - bz->stream.avail_in;
start_msg();
bz->stream.next_in = (char*)input + read_from_block;
bz->stream.avail_in = length - read_from_block;
input += read_from_block;
length -= read_from_block;
}
}
}
/*************************************************
* Start Decompressing with Bzip *
*************************************************/
void Bzip_Decompression::start_msg()
{
clear();
bz = new Bzip_Stream;
if(BZ2_bzDecompressInit(&(bz->stream), 0, small_mem) != BZ_OK)
throw Exception("Bzip_Decompression: Memory allocation error");
no_writes = true;
}
/*************************************************
* Finish Decompressing with Bzip *
*************************************************/
void Bzip_Decompression::end_msg()
{
if(no_writes) return;
bz->stream.next_in = 0;
bz->stream.avail_in = 0;
int rc = BZ_OK;
while(rc != BZ_STREAM_END)
{
bz->stream.next_out = (char*)buffer.begin();
bz->stream.avail_out = buffer.size();
rc = BZ2_bzDecompress(&(bz->stream));
if(rc != BZ_OK && rc != BZ_STREAM_END)
{
clear();
throw Exception("Bzip_Decompression: Error finalizing decompression");
}
send(buffer, buffer.size() - bz->stream.avail_out);
}
clear();
}
/*************************************************
* Clean up Decompression Context *
*************************************************/
void Bzip_Decompression::clear()
{
if(!bz) return;
BZ2_bzDecompressEnd(&(bz->stream));
delete bz;
bz = 0;
}
}
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