SaraP
140 lines
4.6 KiB
C++
140 lines
4.6 KiB
C++
/*++
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Copyright (C) 2019 3MF Consortium
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Abstract:
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NMR_ImportStream_Compressed.h defines the CImportStream_Compressed Class.
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This is a stream class for importing from a compressed object.
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--*/
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#include "Common/Platform/NMR_ImportStream_Shared_Memory.h"
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#include "Common/Platform/NMR_ImportStream_Compressed.h"
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#include "Common/NMR_Exception.h"
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namespace NMR {
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CImportStream_Compressed::CImportStream_Compressed(PImportStream pCompressedStream)
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{
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if (nullptr == pCompressedStream)
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throw CNMRException(NMR_ERROR_INVALIDPOINTER);
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m_pCompressedStream = pCompressedStream;
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// Source: http://zlib.net/zpipe.c
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m_strm.zalloc = Z_NULL;
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m_strm.zfree = Z_NULL;
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m_strm.opaque = Z_NULL;
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m_strm.avail_in = 0;
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m_strm.next_in = Z_NULL;
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if (inflateInit(&m_strm) != Z_OK)
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throw CNMRException(NMR_ERROR_COULDNOTINITINFLATE);
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}
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CImportStream_Compressed::~CImportStream_Compressed()
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{
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(void)inflateEnd(&m_strm);
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}
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nfBool CImportStream_Compressed::seekPosition(_In_ nfUint64 position, _In_ nfBool bHasToSucceed)
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{
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return m_pCompressedStream->seekPosition(position, bHasToSucceed);
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}
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nfBool CImportStream_Compressed::seekForward(_In_ nfUint64 bytes, _In_ nfBool bHasToSucceed)
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{
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return m_pCompressedStream->seekForward(bytes, bHasToSucceed);
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}
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nfBool CImportStream_Compressed::seekFromEnd(_In_ nfUint64 bytes, _In_ nfBool bHasToSucceed)
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{
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return m_pCompressedStream->seekFromEnd(bytes, bHasToSucceed);
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}
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nfUint64 CImportStream_Compressed::getPosition()
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{
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return m_pCompressedStream->getPosition();
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}
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nfUint64 CImportStream_Compressed::readIntoBuffer(nfByte * pBuffer, nfUint64 cbTotalBytesToRead, nfBool bNeedsToReadAll)
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{
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nfBool firstRead = m_strm.next_in == Z_NULL;
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nfBool hasDecompressLeftovers = m_strm.avail_out == 0;
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if (firstRead || !hasDecompressLeftovers) {
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m_strm.avail_in = (nfUint32) m_pCompressedStream->readIntoBuffer(in, IMPORTSTREAM_COMPRESSED_CHUNKSIZE, bNeedsToReadAll);
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if (m_strm.avail_in == 0)
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return 0;
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m_strm.next_in = in;
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}
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m_strm.avail_out = (nfUint32) cbTotalBytesToRead;
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m_strm.next_out = pBuffer;
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nfInt32 ret = inflate(&m_strm, Z_NO_FLUSH);
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switch (ret) {
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case Z_NEED_DICT:
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case Z_DATA_ERROR:
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case Z_MEM_ERROR:
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(void)inflateEnd(&m_strm);
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throw CNMRException(NMR_ERROR_COULDNOTINFLATE);
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}
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if (m_strm.avail_out == 0) {
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nfBool reachedEndOfBuffer = m_strm.avail_in == 0;
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if (reachedEndOfBuffer && ret != Z_STREAM_END) {
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throw CNMRException(NMR_ERROR_COULDNOTINFLATE);
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}
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return cbTotalBytesToRead;
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}
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nfUint64 bytesDecompressed = cbTotalBytesToRead - m_strm.avail_out;
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return readIntoBuffer(pBuffer + bytesDecompressed, m_strm.avail_out, bNeedsToReadAll) + bytesDecompressed;
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}
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nfUint64 CImportStream_Compressed::retrieveSize()
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{
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return m_decompressedBuffer.size();
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}
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void CImportStream_Compressed::writeToFile(_In_ const nfWChar * pwszFileName)
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{
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throw CNMRException(NMR_ERROR_NOTIMPLEMENTED);
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}
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PImportStream CImportStream_Compressed::copyToMemory()
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{
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nfUint64 bytesRead;
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nfUint64 currentPosition = 0;
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nfUint64 chunkSize = IMPORTSTREAM_READ_BUFFER_CHUNKSIZE;
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do {
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m_decompressedBuffer.resize(m_decompressedBuffer.size() + chunkSize);
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bytesRead = readIntoBuffer(&m_decompressedBuffer[currentPosition], chunkSize, false);
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currentPosition += bytesRead;
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} while (chunkSize == bytesRead);
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return std::make_shared<CImportStream_Shared_Memory>(m_decompressedBuffer.data(), m_decompressedBuffer.size());
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}
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}
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