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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* This file is part of the libabw 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 "ABWZlibStream.h"
#include <string.h> // for memcpy
#define BLOCK_SIZE 16384
namespace libabw
{
namespace
{
static bool getInflatedBuffer(librevenge::RVNGInputStream *input, std::vector<unsigned char> &buffer)
{
int ret;
z_stream strm;
unsigned char in[BLOCK_SIZE];
unsigned char out[BLOCK_SIZE];
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit2(&strm, 16 + MAX_WBITS);
if (Z_OK != ret)
return false;
do
{
unsigned long numBytesRead(0);
const unsigned char *p = input->read(BLOCK_SIZE, numBytesRead);
strm.avail_in = uInt(numBytesRead);
if (!strm.avail_in)
break;
memcpy(in, p, strm.avail_in);
strm.next_in = in;
do
{
strm.avail_out = BLOCK_SIZE;
strm.next_out = out;
ret = inflate(&strm, Z_NO_FLUSH);
switch (ret)
{
case Z_NEED_DICT:
case Z_DATA_ERROR:
case Z_MEM_ERROR:
case Z_STREAM_ERROR:
(void)inflateEnd(&strm);
return false;
default:
break;
}
for (unsigned i = 0; i < BLOCK_SIZE - strm.avail_out; ++i)
buffer.push_back(out[i]);
}
while (!strm.avail_out);
}
while (Z_STREAM_END != ret);
(void)inflateEnd(&strm);
input->seek(0, librevenge::RVNG_SEEK_SET);
if (Z_STREAM_END == ret)
return true;
return false;
}
}
ABWZlibStream::ABWZlibStream(librevenge::RVNGInputStream *input) :
librevenge::RVNGInputStream(),
m_input(nullptr),
m_offset(0),
m_buffer()
{
if (!getInflatedBuffer(input, m_buffer))
{
if (input)
{
input->seek(0, librevenge::RVNG_SEEK_CUR);
m_input = input;
}
else
m_buffer.clear();
}
}
const unsigned char *ABWZlibStream::read(unsigned long numBytes, unsigned long &numBytesRead)
{
if (m_input)
return m_input->read(numBytes, numBytesRead);
numBytesRead = 0;
if (numBytes == 0)
return nullptr;
unsigned long numBytesToRead;
if (((unsigned long)m_offset+numBytes) < m_buffer.size())
numBytesToRead = numBytes;
else
numBytesToRead = m_buffer.size() - (unsigned long)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[size_t(oldOffset)];
}
int ABWZlibStream::seek(long offset, librevenge::RVNG_SEEK_TYPE seekType)
{
if (m_input)
return m_input->seek(offset, 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 = (long) m_buffer.size();
return 1;
}
return 0;
}
long ABWZlibStream::tell()
{
if (m_input)
return m_input->tell();
return m_offset;
}
bool ABWZlibStream::isEnd()
{
if (m_input)
return m_input->isEnd();
if ((long)m_offset >= (long)m_buffer.size())
return true;
return false;
}
} // namespace libabw
/* vim:set shiftwidth=2 softtabstop=2 expandtab: */
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