void AppendStringToBuffer(BufferRef buffer, char * append) {
BufferRef appendBuffer = CreateBufferRef();
IncrementBufferRefBySize(appendBuffer, strlen(append)-0x1);
memcpy(appendBuffer->data, append, strlen(append));
AppendBufferToBuffer(buffer, appendBuffer);
}
BufferRef CreateBufferFromBufferWithRange(BufferRef buffer, Range subRange) {
BufferRef sub = CreateBufferRef();
IncrementBufferRefBySize(sub, subRange.length-0x1);
memcpy(sub->data, &(buffer->data[subRange.offset]), subRange.length);
return sub;
}
owBuffer * owZip::RefCompress(owFile * _pFile, int32_t _nLevel)
{
_pFile->Seek( SEEK_SET, 0);
if(_pFile->Eof())
{
return NULL;
}
// 保证有充足的压缩空间
if(_pFile->Size() > m_pTempBuffer->Size())
{
m_pTempBuffer->Resize( _pFile->Size());
}
m_pTempBuffer->Seek( SEEK_SET, 0);
int retCode;
int flush;
z_stream stream;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = Z_NULL;
retCode = deflateInit( &stream, _nLevel);
while( true )
{
stream.avail_in = _pFile->Read( m_pInputChunkBuffer->GetBuffer(), m_pInputChunkBuffer->Size() );
stream.next_in = (Bytef*)m_pInputChunkBuffer->GetBuffer();
flush = _pFile->Eof()?Z_FINISH : Z_NO_FLUSH;
while( stream.avail_in != 0 )
{
stream.avail_out = (uint32_t)m_pOutputChunkBuffer->Size();
stream.next_out = (Bytef*)m_pOutputChunkBuffer->GetBuffer();
retCode = deflate( &stream, flush);
assert(retCode != Z_STREAM_ERROR);
int32_t chunkSize = m_pOutputChunkBuffer->Size() - stream.avail_out;
// m_pTempBuffer 大小会自动增长
m_pTempBuffer->Write( m_pOutputChunkBuffer->GetBuffer(), chunkSize);
}
assert(stream.avail_in == 0);
if(flush == Z_FINISH)
{
break;
}
}
int32_t dataSize = m_pTempBuffer->GetCurr() - m_pTempBuffer->GetBuffer();
if(dataSize == 0)
{
return NULL;
}
else
{
owBuffer * pRet = CreateBufferRef( m_pTempBuffer->GetBuffer(), dataSize);
return pRet;
}
return NULL;
}
