1 // ZlibEncoder.cpp
2
3 #include "StdAfx.h"
4
5 #include "../Common/StreamUtils.h"
6
7 #include "ZlibEncoder.h"
8
9 namespace NCompress {
10 namespace NZlib {
11
12 #define DEFLATE_TRY_BEGIN try {
13 #define DEFLATE_TRY_END } catch(...) { return S_FALSE; }
14
15 UInt32 Adler32_Update(UInt32 adler, const Byte *buf, size_t size);
16
Z7_COM7F_IMF(CInStreamWithAdler::Read (void * data,UInt32 size,UInt32 * processedSize))17 Z7_COM7F_IMF(CInStreamWithAdler::Read(void *data, UInt32 size, UInt32 *processedSize))
18 {
19 const HRESULT result = _stream->Read(data, size, &size);
20 _adler = Adler32_Update(_adler, (const Byte *)data, size);
21 _size += size;
22 if (processedSize)
23 *processedSize = size;
24 return result;
25 }
26
Create()27 void CEncoder::Create()
28 {
29 if (!DeflateEncoder)
30 DeflateEncoder = DeflateEncoderSpec = new NDeflate::NEncoder::CCOMCoder;
31 }
32
Z7_COM7F_IMF(CEncoder::Code (ISequentialInStream * inStream,ISequentialOutStream * outStream,const UInt64 * inSize,const UInt64 *,ICompressProgressInfo * progress))33 Z7_COM7F_IMF(CEncoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
34 const UInt64 *inSize, const UInt64 * /* outSize */, ICompressProgressInfo *progress))
35 {
36 DEFLATE_TRY_BEGIN
37 if (!AdlerStream)
38 AdlerStream = AdlerSpec = new CInStreamWithAdler;
39 Create();
40
41 {
42 Byte buf[2] = { 0x78, 0xDA };
43 RINOK(WriteStream(outStream, buf, 2))
44 }
45
46 AdlerSpec->SetStream(inStream);
47 AdlerSpec->Init();
48 const HRESULT res = DeflateEncoder->Code(AdlerStream, outStream, inSize, NULL, progress);
49 AdlerSpec->ReleaseStream();
50
51 RINOK(res)
52
53 {
54 const UInt32 a = AdlerSpec->GetAdler();
55 const Byte buf[4] = { (Byte)(a >> 24), (Byte)(a >> 16), (Byte)(a >> 8), (Byte)(a) };
56 return WriteStream(outStream, buf, 4);
57 }
58 DEFLATE_TRY_END
59 }
60
61 }}
62