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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* This file is part of the libpict 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 "PictHeader.h"
#include "libpict_utils.h"
namespace
{
unsigned char readU8(librevenge::RVNGInputStream *input)
{
unsigned long numBytesRead;
unsigned char const *p = input->read(sizeof(unsigned char), numBytesRead);
if (numBytesRead != sizeof(unsigned char))
throw libpict::EndOfStreamException();
return *(unsigned char const *)(p);
}
unsigned short readU16(librevenge::RVNGInputStream *input)
{
unsigned long numBytesRead;
unsigned short const *p = (unsigned short const *)input->read(sizeof(unsigned short), numBytesRead);
if (numBytesRead != sizeof(unsigned short))
throw libpict::EndOfStreamException();
return (unsigned short)((((unsigned char const *)(p))[1] << 0) | (((unsigned char const *)(p))[0] << 8));
}
unsigned readU32(librevenge::RVNGInputStream *input)
{
unsigned long numBytesRead;
unsigned const *p = (unsigned const *)input->read(sizeof(unsigned), numBytesRead);
if (numBytesRead != sizeof(unsigned))
throw libpict::EndOfStreamException();
return (unsigned)((((unsigned char const *)(p))[3] << 0) | (((unsigned char const *)(p))[2] << 8) |
(((unsigned char const *)(p))[1] << 16) | (((unsigned char const *)(p))[0] << 24));
}
}
PictHeader::PictHeader() :
m_fileSize(0),
m_top(0),
m_left(0),
m_bottom(0),
m_right(0),
m_pictVersion(0),
m_horizontalResolution(72),
m_verticalResolution(72),
m_pictureSize(0),
m_dataStart(0)
{
}
bool PictHeader::load(librevenge::RVNGInputStream *input)
{
if (loadPict1Header(input))
return true;
if (loadPict2Header(input))
return true;
return false;
}
bool PictHeader::loadPict1Header(librevenge::RVNGInputStream *input)
{
input->seek(0, librevenge::RVNG_SEEK_SET);
/* Try first to see whether the 512 bytes header is missing */
input->seek(10, librevenge::RVNG_SEEK_CUR);
if ((0x11 == readU8(input)) && (0x01 == readU8(input)))
input->seek(0, librevenge::RVNG_SEEK_CUR);
/* Ok, let us now skip the first 512 bytes and restart */
else
{
input->seek(512 + 10, librevenge::RVNG_SEEK_SET);
if ((0x11 == readU8(input)) && (0x01 == readU8(input)))
input->seek(512, librevenge::RVNG_SEEK_SET);
else
{
input->seek(0, librevenge::RVNG_SEEK_SET);
PICT_DEBUG_MSG(("No Pict1 header present\n"));
return false;
}
}
/* Now, we should be out or at the beginning of the Pict1 file */
PICT_DEBUG_MSG(("Reading Pict1 header\n"));
m_fileSize = readU16(input);
m_top = readU16(input);
m_left = readU16(input);
m_bottom = readU16(input);
m_right = readU16(input);
if (0x11 != readU8(input))
{
input->seek(0, librevenge::RVNG_SEEK_SET);
return false;
}
if (0x01 != readU8(input))
{
input->seek(0, librevenge::RVNG_SEEK_SET);
return false;
}
PICT_DEBUG_MSG(("Pict1Header: fileSize = 0x%.4x, top = 0x%.4x, left = 0x%.4x, bottom = 0x%.4x, right = 0x%.4x\n", m_fileSize, m_top, m_left, m_bottom, m_right));
m_dataStart = input->tell();
input->seek(0, librevenge::RVNG_SEEK_SET);
m_pictVersion = 1;
return true;
}
bool PictHeader::loadPict2Header(librevenge::RVNGInputStream *input)
{
input->seek(0, librevenge::RVNG_SEEK_SET);
/* Try first to see whether the 512 bytes header is missing */
input->seek(10, librevenge::RVNG_SEEK_CUR);
if ((0x0011 == readU16(input)) && (0x02FF == readU16(input)))
input->seek(0, librevenge::RVNG_SEEK_CUR);
/* Ok, let us now skip the first 512 bytes and restart */
else
{
input->seek(512 + 10, librevenge::RVNG_SEEK_SET);
if ((0x0011 == readU16(input)) && (0x02FF == readU16(input)))
input->seek(512, librevenge::RVNG_SEEK_SET);
else
{
input->seek(0, librevenge::RVNG_SEEK_SET);
PICT_DEBUG_MSG(("No Pict2 header present\n"));
return false;
}
}
/* Now, we should be out or at the beginning of the Pict1 file */
PICT_DEBUG_MSG(("Reading Pict2 header\n"));
m_fileSize = readU16(input);
m_top = readU16(input);
m_left = readU16(input);
m_bottom = readU16(input);
m_right = readU16(input);
if (0x0011 != readU16(input))
{
input->seek(0, librevenge::RVNG_SEEK_SET);
return false;
}
if (0x02FF != readU16(input))
{
input->seek(0, librevenge::RVNG_SEEK_SET);
return false;
}
if (0x0C00 != readU16(input))
{
input->seek(0, librevenge::RVNG_SEEK_SET);
return false;
}
else
input->seek(24, librevenge::RVNG_SEEK_CUR);
PICT_DEBUG_MSG(("Pict2Header: fileSize = 0x%.4x, top = 0x%.4x, left = 0x%.4x, bottom = 0x%.4x, right = 0x%.4x\n", m_fileSize, m_top, m_left, m_bottom, m_right));
m_dataStart = input->tell();
input->seek(0, librevenge::RVNG_SEEK_SET);
m_pictVersion = 2;
return true;
}
/* vim:set shiftwidth=2 softtabstop=2 expandtab: */
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