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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* This file is part of the libfreehand project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <zlib.h>
#include "FHInternalStream.h"
#include "libfreehand_utils.h"
#include <string.h> // for memcpy
#define CHUNK 16384
libfreehand::FHInternalStream::FHInternalStream(librevenge::RVNGInputStream *input, unsigned long size, bool compressed) :
librevenge::RVNGInputStream(),
m_offset(0),
m_buffer()
{
if (!size)
return;
if (!compressed)
{
unsigned long tmpNumBytesRead = 0;
const unsigned char *tmpBuffer = input->read(size, tmpNumBytesRead);
if (size != tmpNumBytesRead)
return;
m_buffer = std::vector<unsigned char>(size);
memcpy(&m_buffer[0], tmpBuffer, size);
}
else
{
int ret;
unsigned have;
z_stream strm;
unsigned char out[CHUNK];
/* allocate inflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit(&strm);
if (ret != Z_OK)
return;
unsigned long tmpNumBytesRead = 0;
const unsigned char *tmpBuffer = input->read(size, tmpNumBytesRead);
if (size != tmpNumBytesRead)
{
(void)inflateEnd(&strm);
return;
}
strm.avail_in = (uInt)tmpNumBytesRead;
strm.next_in = (Bytef *)tmpBuffer;
do
{
strm.avail_out = CHUNK;
strm.next_out = out;
ret = inflate(&strm, Z_NO_FLUSH);
switch (ret)
{
case Z_NEED_DICT:
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void)inflateEnd(&strm);
m_buffer.clear();
return;
}
have = CHUNK - strm.avail_out;
for (unsigned long i=0; i<have; i++)
m_buffer.push_back(out[i]);
}
while (strm.avail_out == 0);
(void)inflateEnd(&strm);
}
}
const unsigned char *libfreehand::FHInternalStream::read(unsigned long numBytes, unsigned long &numBytesRead)
{
numBytesRead = 0;
if (numBytes == 0)
return nullptr;
unsigned numBytesToRead;
if ((m_offset+numBytes) < m_buffer.size())
numBytesToRead = numBytes;
else
numBytesToRead = m_buffer.size() - m_offset;
numBytesRead = numBytesToRead; // about as paranoid as we can be..
if (numBytesToRead == 0)
return nullptr;
long oldOffset = m_offset;
m_offset += numBytesToRead;
return &m_buffer[oldOffset];
}
int libfreehand::FHInternalStream::seek(long offset, librevenge::RVNG_SEEK_TYPE seekType)
{
if (seekType == librevenge::RVNG_SEEK_CUR)
m_offset += offset;
else if (seekType == librevenge::RVNG_SEEK_SET)
m_offset = offset;
if (m_offset < 0)
{
m_offset = 0;
return 1;
}
if ((long)m_offset > (long)m_buffer.size())
{
m_offset = m_buffer.size();
return 1;
}
return 0;
}
long libfreehand::FHInternalStream::tell()
{
return m_offset;
}
bool libfreehand::FHInternalStream::isEnd()
{
if ((long)m_offset >= (long)m_buffer.size())
return true;
return false;
}
/* vim:set shiftwidth=2 softtabstop=2 expandtab: */
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