mirror of
https://github.com/opencv/opencv.git
synced 2025-01-07 19:54:18 +08:00
94a9e16943
Root cause: when calling imread to read the pgm file, when returning with success reading file, the destructor will free the resource which used by memcpy, but in the code, the resource calculation was not correct, therefore, it will cause memory corruption during resource free.
513 lines
15 KiB
C++
513 lines
15 KiB
C++
/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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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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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's 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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//
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// * The name of the copyright holders may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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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 disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// 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
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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#include "precomp.hpp"
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#include "utils.hpp"
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#include "grfmt_pxm.hpp"
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namespace cv
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{
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///////////////////////// P?M reader //////////////////////////////
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static int ReadNumber( RLByteStream& strm, int maxdigits )
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{
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int code;
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int val = 0;
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int digits = 0;
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code = strm.getByte();
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if( !isdigit(code))
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{
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do
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{
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if( code == '#' )
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{
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do
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{
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code = strm.getByte();
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}
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while( code != '\n' && code != '\r' );
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}
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code = strm.getByte();
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while( isspace(code))
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code = strm.getByte();
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}
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while( !isdigit( code ));
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}
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do
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{
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val = val*10 + code - '0';
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if( ++digits >= maxdigits ) break;
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code = strm.getByte();
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}
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while( isdigit(code));
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return val;
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}
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PxMDecoder::PxMDecoder()
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{
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m_offset = -1;
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m_buf_supported = true;
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}
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PxMDecoder::~PxMDecoder()
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{
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close();
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}
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size_t PxMDecoder::signatureLength() const
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{
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return 3;
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}
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bool PxMDecoder::checkSignature( const String& signature ) const
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{
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return signature.size() >= 3 && signature[0] == 'P' &&
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'1' <= signature[1] && signature[1] <= '6' &&
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isspace(signature[2]);
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}
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ImageDecoder PxMDecoder::newDecoder() const
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{
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return makePtr<PxMDecoder>();
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}
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void PxMDecoder::close()
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{
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m_strm.close();
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}
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bool PxMDecoder::readHeader()
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{
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bool result = false;
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if( !m_buf.empty() )
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{
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if( !m_strm.open(m_buf) )
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return false;
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}
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else if( !m_strm.open( m_filename ))
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return false;
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try
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{
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int code = m_strm.getByte();
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if( code != 'P' )
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throw RBS_BAD_HEADER;
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code = m_strm.getByte();
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switch( code )
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{
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case '1': case '4': m_bpp = 1; break;
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case '2': case '5': m_bpp = 8; break;
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case '3': case '6': m_bpp = 24; break;
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default: throw RBS_BAD_HEADER;
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}
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m_binary = code >= '4';
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m_type = m_bpp > 8 ? CV_8UC3 : CV_8UC1;
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m_width = ReadNumber( m_strm, INT_MAX );
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m_height = ReadNumber( m_strm, INT_MAX );
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m_maxval = m_bpp == 1 ? 1 : ReadNumber( m_strm, INT_MAX );
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if( m_maxval > 65535 )
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throw RBS_BAD_HEADER;
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//if( m_maxval > 255 ) m_binary = false; nonsense
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if( m_maxval > 255 )
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m_type = CV_MAKETYPE(CV_16U, CV_MAT_CN(m_type));
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if( m_width > 0 && m_height > 0 && m_maxval > 0 && m_maxval < (1 << 16))
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{
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m_offset = m_strm.getPos();
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result = true;
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}
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}
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catch(...)
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{
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}
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if( !result )
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{
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m_offset = -1;
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m_width = m_height = -1;
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m_strm.close();
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}
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return result;
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}
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bool PxMDecoder::readData( Mat& img )
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{
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int color = img.channels() > 1;
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uchar* data = img.ptr();
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PaletteEntry palette[256];
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bool result = false;
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int bit_depth = CV_ELEM_SIZE1(m_type)*8;
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int src_pitch = (m_width*m_bpp*bit_depth/8 + 7)/8;
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int nch = CV_MAT_CN(m_type);
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int width3 = m_width*nch;
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int i, x, y;
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if( m_offset < 0 || !m_strm.isOpened())
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return false;
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AutoBuffer<uchar> _src(src_pitch + 32);
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uchar* src = _src;
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AutoBuffer<uchar> _gray_palette;
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uchar* gray_palette = _gray_palette;
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// create LUT for converting colors
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if( bit_depth == 8 )
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{
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_gray_palette.allocate(m_maxval + 1);
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gray_palette = _gray_palette;
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for( i = 0; i <= m_maxval; i++ )
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gray_palette[i] = (uchar)((i*255/m_maxval)^(m_bpp == 1 ? 255 : 0));
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FillGrayPalette( palette, m_bpp==1 ? 1 : 8 , m_bpp == 1 );
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}
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try
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{
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m_strm.setPos( m_offset );
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switch( m_bpp )
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{
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////////////////////////// 1 BPP /////////////////////////
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case 1:
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if( !m_binary )
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{
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for( y = 0; y < m_height; y++, data += img.step )
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{
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for( x = 0; x < m_width; x++ )
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src[x] = ReadNumber( m_strm, 1 ) != 0;
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if( color )
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FillColorRow8( data, src, m_width, palette );
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else
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FillGrayRow8( data, src, m_width, gray_palette );
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}
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}
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else
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{
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for( y = 0; y < m_height; y++, data += img.step )
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{
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m_strm.getBytes( src, src_pitch );
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if( color )
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FillColorRow1( data, src, m_width, palette );
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else
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FillGrayRow1( data, src, m_width, gray_palette );
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}
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}
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result = true;
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break;
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////////////////////////// 8 BPP /////////////////////////
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case 8:
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case 24:
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for( y = 0; y < m_height; y++, data += img.step )
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{
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if( !m_binary )
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{
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for( x = 0; x < width3; x++ )
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{
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int code = ReadNumber( m_strm, INT_MAX );
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if( (unsigned)code > (unsigned)m_maxval ) code = m_maxval;
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if( bit_depth == 8 )
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src[x] = gray_palette[code];
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else
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((ushort *)src)[x] = (ushort)code;
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}
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}
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else
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{
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m_strm.getBytes( src, src_pitch );
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if( bit_depth == 16 && !isBigEndian() )
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{
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for( x = 0; x < width3; x++ )
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{
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uchar v = src[x * 2];
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src[x * 2] = src[x * 2 + 1];
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src[x * 2 + 1] = v;
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}
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}
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}
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if( img.depth() == CV_8U && bit_depth == 16 )
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{
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for( x = 0; x < width3; x++ )
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{
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int v = ((ushort *)src)[x];
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src[x] = (uchar)(v >> 8);
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}
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}
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if( m_bpp == 8 ) // image has one channel
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{
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if( color )
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{
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if( img.depth() == CV_8U ) {
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uchar *d = data, *s = src, *end = src + m_width;
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for( ; s < end; d += 3, s++)
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d[0] = d[1] = d[2] = *s;
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} else {
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ushort *d = (ushort *)data, *s = (ushort *)src, *end = ((ushort *)src) + m_width;
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for( ; s < end; s++, d += 3)
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d[0] = d[1] = d[2] = *s;
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}
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}
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else
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memcpy( data, src, m_width);
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}
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else
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{
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if( color )
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{
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if( img.depth() == CV_8U )
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icvCvt_RGB2BGR_8u_C3R( src, 0, data, 0, cvSize(m_width,1) );
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else
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icvCvt_RGB2BGR_16u_C3R( (ushort *)src, 0, (ushort *)data, 0, cvSize(m_width,1) );
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}
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else if( img.depth() == CV_8U )
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icvCvt_BGR2Gray_8u_C3C1R( src, 0, data, 0, cvSize(m_width,1), 2 );
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else
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icvCvt_BGRA2Gray_16u_CnC1R( (ushort *)src, 0, (ushort *)data, 0, cvSize(m_width,1), 3, 2 );
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}
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}
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result = true;
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break;
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default:
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assert(0);
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}
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}
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catch(...)
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{
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}
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return result;
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}
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//////////////////////////////////////////////////////////////////////////////////////////
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PxMEncoder::PxMEncoder()
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{
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m_description = "Portable image format (*.pbm;*.pgm;*.ppm;*.pxm;*.pnm)";
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m_buf_supported = true;
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}
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PxMEncoder::~PxMEncoder()
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{
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}
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ImageEncoder PxMEncoder::newEncoder() const
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{
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return makePtr<PxMEncoder>();
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}
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bool PxMEncoder::isFormatSupported( int depth ) const
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{
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return depth == CV_8U || depth == CV_16U;
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}
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bool PxMEncoder::write( const Mat& img, const std::vector<int>& params )
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{
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bool isBinary = true;
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int width = img.cols, height = img.rows;
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int _channels = img.channels(), depth = (int)img.elemSize1()*8;
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int channels = _channels > 1 ? 3 : 1;
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int fileStep = width*(int)img.elemSize();
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int x, y;
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for( size_t i = 0; i < params.size(); i += 2 )
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if( params[i] == CV_IMWRITE_PXM_BINARY )
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isBinary = params[i+1] != 0;
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WLByteStream strm;
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if( m_buf )
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{
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if( !strm.open(*m_buf) )
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return false;
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int t = CV_MAKETYPE(img.depth(), channels);
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m_buf->reserve( alignSize(256 + (isBinary ? fileStep*height :
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((t == CV_8UC1 ? 4 : t == CV_8UC3 ? 4*3+2 :
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t == CV_16UC1 ? 6 : 6*3+2)*width+1)*height), 256));
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}
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else if( !strm.open(m_filename) )
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return false;
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int lineLength;
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int bufferSize = 128; // buffer that should fit a header
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if( isBinary )
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lineLength = width * (int)img.elemSize();
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else
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lineLength = (6 * channels + (channels > 1 ? 2 : 0)) * width + 32;
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if( bufferSize < lineLength )
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bufferSize = lineLength;
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AutoBuffer<char> _buffer(bufferSize);
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char* buffer = _buffer;
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// write header;
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sprintf( buffer, "P%c\n%d %d\n%d\n",
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'2' + (channels > 1 ? 1 : 0) + (isBinary ? 3 : 0),
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width, height, (1 << depth) - 1 );
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strm.putBytes( buffer, (int)strlen(buffer) );
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for( y = 0; y < height; y++ )
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{
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const uchar* const data = img.ptr(y);
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if( isBinary )
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{
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if( _channels == 3 )
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{
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if( depth == 8 )
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icvCvt_BGR2RGB_8u_C3R( (const uchar*)data, 0,
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(uchar*)buffer, 0, cvSize(width,1) );
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else
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icvCvt_BGR2RGB_16u_C3R( (const ushort*)data, 0,
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(ushort*)buffer, 0, cvSize(width,1) );
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}
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// swap endianness if necessary
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if( depth == 16 && !isBigEndian() )
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{
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if( _channels == 1 )
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memcpy( buffer, data, fileStep );
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for( x = 0; x < width*channels*2; x += 2 )
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{
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uchar v = buffer[x];
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buffer[x] = buffer[x + 1];
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buffer[x + 1] = v;
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}
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}
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strm.putBytes( (channels > 1 || depth > 8) ? buffer : (const char*)data, fileStep );
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}
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else
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{
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char* ptr = buffer;
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if( channels > 1 )
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{
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if( depth == 8 )
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{
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for( x = 0; x < width*channels; x += channels )
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{
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sprintf( ptr, "% 4d", data[x + 2] );
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ptr += 4;
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sprintf( ptr, "% 4d", data[x + 1] );
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ptr += 4;
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sprintf( ptr, "% 4d", data[x] );
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ptr += 4;
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*ptr++ = ' ';
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*ptr++ = ' ';
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}
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}
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else
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{
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for( x = 0; x < width*channels; x += channels )
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{
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sprintf( ptr, "% 6d", ((const ushort *)data)[x + 2] );
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ptr += 6;
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sprintf( ptr, "% 6d", ((const ushort *)data)[x + 1] );
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ptr += 6;
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sprintf( ptr, "% 6d", ((const ushort *)data)[x] );
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ptr += 6;
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*ptr++ = ' ';
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*ptr++ = ' ';
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}
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}
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}
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else
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{
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if( depth == 8 )
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{
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for( x = 0; x < width; x++ )
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{
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sprintf( ptr, "% 4d", data[x] );
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ptr += 4;
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}
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}
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else
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{
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for( x = 0; x < width; x++ )
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{
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sprintf( ptr, "% 6d", ((const ushort *)data)[x] );
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ptr += 6;
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}
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}
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}
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*ptr++ = '\n';
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strm.putBytes( buffer, (int)(ptr - buffer) );
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}
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}
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strm.close();
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return true;
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}
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}
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