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// ZlibEncoder.cpp
#include "StdAfx.h"
#include "../Common/StreamUtils.h"
#include "ZlibEncoder.h"
namespace NCompress {
namespace NZlib {
#define DEFLATE_TRY_BEGIN try {
#define DEFLATE_TRY_END } catch(...) { return S_FALSE; }
UInt32 Adler32_Update(UInt32 adler, const Byte *buf, size_t size);
STDMETHODIMP CInStreamWithAdler::Read(void *data, UInt32 size, UInt32 *processedSize)
{
HRESULT result = _stream->Read(data, size, &size);
_adler = Adler32_Update(_adler, (const Byte *)data, size);
_size += size;
if (processedSize != NULL)
*processedSize = size;
return result;
}
void CEncoder::Create()
{
if (!DeflateEncoder)
DeflateEncoder = DeflateEncoderSpec = new NDeflate::NEncoder::CCOMCoder;
}
STDMETHODIMP CEncoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 *inSize, const UInt64 * /* outSize */, ICompressProgressInfo *progress)
{
DEFLATE_TRY_BEGIN
if (!AdlerStream)
AdlerStream = AdlerSpec = new CInStreamWithAdler;
Create();
{
Byte buf[2] = { 0x78, 0xDA };
RINOK(WriteStream(outStream, buf, 2));
}
AdlerSpec->SetStream(inStream);
AdlerSpec->Init();
HRESULT res = DeflateEncoder->Code(AdlerStream, outStream, inSize, NULL, progress);
AdlerSpec->ReleaseStream();
RINOK(res);
{
UInt32 a = AdlerSpec->GetAdler();
Byte buf[4] = { (Byte)(a >> 24), (Byte)(a >> 16), (Byte)(a >> 8), (Byte)(a) };
return WriteStream(outStream, buf, 4);
}
DEFLATE_TRY_END
}
}}
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