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/*************************************************
* Zlib Compressor Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/zlib.h>
#include <cstring>
#include <map>
#include <zlib.h>
namespace Botan {
namespace {
/*************************************************
* Allocation Information for Zlib *
*************************************************/
class Zlib_Alloc_Info
{
public:
std::map<void*, u32bit> current_allocs;
Allocator* alloc;
Zlib_Alloc_Info() { alloc = Allocator::get(false); }
};
/*************************************************
* Allocation Function for Zlib *
*************************************************/
void* zlib_malloc(void* info_ptr, unsigned int n, unsigned int size)
{
Zlib_Alloc_Info* info = static_cast<Zlib_Alloc_Info*>(info_ptr);
void* ptr = info->alloc->allocate(n * size);
info->current_allocs[ptr] = n * size;
return ptr;
}
/*************************************************
* Allocation Function for Zlib *
*************************************************/
void zlib_free(void* info_ptr, void* ptr)
{
Zlib_Alloc_Info* info = static_cast<Zlib_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("zlib_free: Got pointer not allocated by us");
info->alloc->deallocate(ptr, i->second);
}
}
/*************************************************
* Wrapper Type for Zlib z_stream *
*************************************************/
class Zlib_Stream
{
public:
z_stream stream;
Zlib_Stream()
{
std::memset(&stream, 0, sizeof(z_stream));
stream.zalloc = zlib_malloc;
stream.zfree = zlib_free;
stream.opaque = new Zlib_Alloc_Info;
}
~Zlib_Stream()
{
Zlib_Alloc_Info* info = static_cast<Zlib_Alloc_Info*>(stream.opaque);
delete info;
std::memset(&stream, 0, sizeof(z_stream));
}
};
/*************************************************
* Zlib_Compression Constructor *
*************************************************/
Zlib_Compression::Zlib_Compression(u32bit l) :
level((l >= 9) ? 9 : l), buffer(DEFAULT_BUFFERSIZE)
{
zlib = 0;
}
/*************************************************
* Start Compressing with Zlib *
*************************************************/
void Zlib_Compression::start_msg()
{
clear();
zlib = new Zlib_Stream;
if(deflateInit(&(zlib->stream), level) != Z_OK)
throw Exception("Zlib_Compression: Memory allocation error");
}
/*************************************************
* Compress Input with Zlib *
*************************************************/
void Zlib_Compression::write(const byte input[], u32bit length)
{
zlib->stream.next_in = static_cast<Bytef*>(input);
zlib->stream.avail_in = length;
while(zlib->stream.avail_in != 0)
{
zlib->stream.next_out = static_cast<Bytef*>(buffer.begin());
zlib->stream.avail_out = buffer.size();
deflate(&(zlib->stream), Z_NO_FLUSH);
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
}
}
/*************************************************
* Finish Compressing with Zlib *
*************************************************/
void Zlib_Compression::end_msg()
{
zlib->stream.next_in = 0;
zlib->stream.avail_in = 0;
int rc = Z_OK;
while(rc != Z_STREAM_END)
{
zlib->stream.next_out = static_cast<Bytef*>(buffer.begin());
zlib->stream.avail_out = buffer.size();
rc = deflate(&(zlib->stream), Z_FINISH);
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
}
clear();
}
/*************************************************
* Flush the Zlib Compressor *
*************************************************/
void Zlib_Compression::flush()
{
zlib->stream.next_in = 0;
zlib->stream.avail_in = 0;
while(true)
{
zlib->stream.next_out = static_cast<Bytef*>(buffer.begin());
zlib->stream.avail_out = buffer.size();
deflate(&(zlib->stream), Z_FULL_FLUSH);
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
if(zlib->stream.avail_out == buffer.size()) break;
}
}
/*************************************************
* Clean up Compression Context *
*************************************************/
void Zlib_Compression::clear()
{
if(zlib)
{
deflateEnd(&(zlib->stream));
delete zlib;
zlib = 0;
}
buffer.clear();
}
/*************************************************
* Zlib_Decompression Constructor *
*************************************************/
Zlib_Decompression::Zlib_Decompression() : buffer(DEFAULT_BUFFERSIZE)
{
zlib = 0;
no_writes = true;
}
/*************************************************
* Start Decompressing with Zlib *
*************************************************/
void Zlib_Decompression::start_msg()
{
clear();
zlib = new Zlib_Stream;
if(inflateInit(&(zlib->stream)) != Z_OK)
throw Exception("Zlib_Decompression: Memory allocation error");
}
/*************************************************
* Decompress Input with Zlib *
*************************************************/
void Zlib_Decompression::write(const byte input[], u32bit length)
{
if(length) no_writes = false;
zlib->stream.next_in = static_cast<Bytef*>(input;
zlib->stream.avail_in = length;
while(zlib->stream.avail_in != 0)
{
zlib->stream.next_out = static_cast<Bytef*>(buffer.begin();
zlib->stream.avail_out = buffer.size();
int rc = inflate(&(zlib->stream), Z_SYNC_FLUSH);
if(rc != Z_OK && rc != Z_STREAM_END)
{
clear();
if(rc == Z_DATA_ERROR)
throw Decoding_Error("Zlib_Decompression: Data integrity error");
if(rc == Z_NEED_DICT)
throw Decoding_Error("Zlib_Decompression: Need preset dictionary");
if(rc == Z_MEM_ERROR)
throw Exception("Zlib_Decompression: Memory allocation error");
throw Exception("Zlib_Decompression: Unknown decompress error");
}
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
if(rc == Z_STREAM_END)
{
u32bit read_from_block = length - zlib->stream.avail_in;
start_msg();
zlib->stream.next_in = static_cast<Bytef*>(input + read_from_block;
zlib->stream.avail_in = length - read_from_block;
input += read_from_block;
length -= read_from_block;
}
}
}
/*************************************************
* Finish Decompressing with Zlib *
*************************************************/
void Zlib_Decompression::end_msg()
{
if(no_writes) return;
zlib->stream.next_in = 0;
zlib->stream.avail_in = 0;
int rc = Z_OK;
while(rc != Z_STREAM_END)
{
zlib->stream.next_out = static_cast<Bytef*>(buffer.begin();
zlib->stream.avail_out = buffer.size();
rc = inflate(&(zlib->stream), Z_SYNC_FLUSH);
if(rc != Z_OK && rc != Z_STREAM_END)
{
clear();
throw Exception("Zlib_Decompression: Error finalizing decompression");
}
send(buffer.begin(), buffer.size() - zlib->stream.avail_out);
}
clear();
}
/*************************************************
* Clean up Decompression Context *
*************************************************/
void Zlib_Decompression::clear()
{
no_writes = true;
if(zlib)
{
inflateEnd(&(zlib->stream));
delete zlib;
zlib = 0;
}
buffer.clear();
}
}
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