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316 lines
10 KiB
316 lines
10 KiB
/* This file is part of the KDE project
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* Copyright (C) 2001, 2002 Rolf Magnus <ramagnus@kde.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* $Id$
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*/
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#include <stdlib.h>
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#include "kfile_png.h"
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#include <kurl.h>
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#include <kprocess.h>
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#include <klocale.h>
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#include <kgenericfactory.h>
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#include <kdebug.h>
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#include <qcstring.h>
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#include <qfile.h>
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#include <qdatetime.h>
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#include <qdict.h>
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#include <qvalidator.h>
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#include <zlib.h>
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// some defines to make it easier
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// don't tell me anything about preprocessor usage :)
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#define CHUNK_SIZE(data, index) ((data[index ]<<24) + (data[index+1]<<16) + \
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(data[index+2]<< 8) + data[index+3])
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#define CHUNK_TYPE(data, index) &data[index+4]
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#define CHUNK_HEADER_SIZE 12
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#define CHUNK_DATA(data, index, offset) data[8+index+offset]
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// known translations for common png keys
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static const char* knownTranslations[]
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#ifdef __GNUC__
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__attribute__((unused))
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#endif
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= {
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I18N_NOOP("Title"),
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I18N_NOOP("Author"),
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I18N_NOOP("Description"),
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I18N_NOOP("Copyright"),
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I18N_NOOP("Creation Time"),
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I18N_NOOP("Software"),
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I18N_NOOP("Disclaimer"),
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I18N_NOOP("Warning"),
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I18N_NOOP("Source"),
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I18N_NOOP("Comment")
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};
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// and for the colors
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static const char* colors[] = {
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I18N_NOOP("Grayscale"),
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I18N_NOOP("Unknown"),
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I18N_NOOP("RGB"),
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I18N_NOOP("Palette"),
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I18N_NOOP("Grayscale/Alpha"),
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I18N_NOOP("Unknown"),
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I18N_NOOP("RGB/Alpha")
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};
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// and compressions
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static const char* compressions[] =
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{
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I18N_NOOP("Deflate")
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};
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// interlaced modes
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static const char* interlaceModes[] = {
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I18N_NOOP("None"),
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I18N_NOOP("Adam7")
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};
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typedef KGenericFactory<KPngPlugin> PngFactory;
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K_EXPORT_COMPONENT_FACTORY(kfile_png, PngFactory("kfile_png"))
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KPngPlugin::KPngPlugin(QObject *parent, const char *name,
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const QStringList &args)
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: KFilePlugin(parent, name, args)
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{
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kdDebug(7034) << "png plugin\n";
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// set up our mime type
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KFileMimeTypeInfo* info = addMimeTypeInfo( "image/png" );
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KFileMimeTypeInfo::GroupInfo* group = 0;
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KFileMimeTypeInfo::ItemInfo* item = 0;
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// comment group
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group = addGroupInfo(info, "Comment", i18n("Comment"));
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addVariableInfo(group, QVariant::String, 0);
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// technical group
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group = addGroupInfo(info, "Technical", i18n("Technical Details"));
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item = addItemInfo(group, "Dimensions", i18n("Dimensions"), QVariant::Size);
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setHint( item, KFileMimeTypeInfo::Size );
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setUnit(item, KFileMimeTypeInfo::Pixels);
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item = addItemInfo(group, "BitDepth", i18n("Bit Depth"), QVariant::Int);
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setUnit(item, KFileMimeTypeInfo::BitsPerPixel);
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addItemInfo(group, "ColorMode", i18n("Color Mode"), QVariant::String);
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addItemInfo(group, "Compression", i18n("Compression"), QVariant::String);
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addItemInfo(group, "InterlaceMode", i18n("Interlace Mode"),QVariant::String);
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}
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bool KPngPlugin::readInfo( KFileMetaInfo& info, uint what)
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{
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if ( info.path().isEmpty() ) // remote file
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return false;
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QFile f(info.path());
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if ( !f.open(IO_ReadOnly) )
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return false;
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QIODevice::Offset fileSize = f.size();
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if (fileSize < 29) return false;
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// the technical group will be read from the first 29 bytes. If the file
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// is smaller, we can't even read this.
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bool readComments = false;
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if (what & (KFileMetaInfo::Fastest |
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KFileMetaInfo::DontCare |
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KFileMetaInfo::ContentInfo)) readComments = true;
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else
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fileSize = 29; // No need to read more
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uchar *data = new uchar[fileSize+1];
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f.readBlock(reinterpret_cast<char*>(data), fileSize);
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data[fileSize]='\n';
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// find the start
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if (data[0] == 137 && data[1] == 80 && data[2] == 78 && data[3] == 71 &&
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data[4] == 13 && data[5] == 10 && data[6] == 26 && data[7] == 10 )
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{
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// ok
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// the IHDR chunk should be the first
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if (!strncmp((char*)&data[12], "IHDR", 4))
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{
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// we found it, get the dimensions
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ulong x,y;
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x = (data[16]<<24) + (data[17]<<16) + (data[18]<<8) + data[19];
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y = (data[20]<<24) + (data[21]<<16) + (data[22]<<8) + data[23];
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uint type = data[25];
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uint bpp = data[24];
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kdDebug(7034) << "dimensions " << x << "*" << y << endl;
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// the bpp are only per channel, so we need to multiply the with
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// the channel count
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switch (type)
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{
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case 0: break; // Grayscale
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case 2: bpp *= 3; break; // RGB
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case 3: break; // palette
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case 4: bpp *= 2; break; // grayscale w. alpha
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case 6: bpp *= 4; break; // RGBA
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default: // we don't get any sensible value here
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bpp = 0;
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}
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KFileMetaInfoGroup techgroup = appendGroup(info, "Technical");
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appendItem(techgroup, "Dimensions", QSize(x, y));
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appendItem(techgroup, "BitDepth", bpp);
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appendItem(techgroup, "ColorMode",
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(type < sizeof(colors)/sizeof(colors[0]))
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? i18n(colors[data[25]]) : i18n("Unknown"));
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appendItem(techgroup, "Compression",
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(data[26] < sizeof(compressions)/sizeof(compressions[0]))
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? i18n(compressions[data[26]]) : i18n("Unknown"));
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appendItem(techgroup, "InterlaceMode",
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(data[28] < sizeof(interlaceModes)/sizeof(interlaceModes[0]))
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? i18n(interlaceModes[data[28]]) : i18n("Unknown"));
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}
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// look for a tEXt chunk
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if (readComments)
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{
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uint index = 8;
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index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE;
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KFileMetaInfoGroup commentGroup = appendGroup(info, "Comment");
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while(index<fileSize-12)
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{
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while (index < fileSize - 12 &&
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strncmp((char*)CHUNK_TYPE(data,index), "tEXt", 4) &&
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strncmp((char*)CHUNK_TYPE(data,index), "zTXt", 4))
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{
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if (!strncmp((char*)CHUNK_TYPE(data,index), "IEND", 4))
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goto end;
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index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE;
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}
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if (index < fileSize - 12)
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{
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// we found a tEXt or zTXt field
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// get the key, it's a null terminated string at the
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// chunk start
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uchar* key = &CHUNK_DATA(data,index,0);
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int keysize=0;
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for (;key[keysize]!=0; keysize++)
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// look if we reached the end of the file
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// (it might be corrupted)
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if (8+index+keysize>=fileSize)
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goto end;
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QByteArray arr;
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if(!strncmp((char*)CHUNK_TYPE(data,index), "zTXt", 4)) {
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kdDebug(7034) << "We found a zTXt field\n";
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// we get the compression method after the key
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uchar* compressionMethod = &CHUNK_DATA(data,index,keysize+1);
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if ( *compressionMethod != 0x00 ) {
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// then it isn't zlib compressed and we are sunk
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kdDebug(7034) << "Non-standard compression method." << endl;
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goto end;
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}
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// compressed string after the compression technique spec
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uchar* compressedText = &CHUNK_DATA(data, index, keysize+2);
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uint compressedTextSize = CHUNK_SIZE(data, index)-keysize-2;
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// security check, also considering overflow wraparound from the addition --
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// we may endup with a /smaller/ index if we wrap all the way around
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uint firstIndex = (uint)(compressedText - data);
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uint onePastLastIndex = firstIndex + compressedTextSize;
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if ( onePastLastIndex > fileSize || onePastLastIndex <= firstIndex)
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goto end;
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uLongf uncompressedLen = compressedTextSize * 2; // just a starting point
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int zlibResult;
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do {
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arr.resize(uncompressedLen);
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zlibResult = uncompress((Bytef*)arr.data(), &uncompressedLen,
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compressedText, compressedTextSize);
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if (Z_OK == zlibResult) {
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// then it is all OK
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arr.resize(uncompressedLen);
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} else if (Z_BUF_ERROR == zlibResult) {
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// the uncompressedArray needs to be larger
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// kdDebug(7034) << "doubling size for decompression" << endl;
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uncompressedLen *= 2;
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// DoS protection. can't be bigger than 64k
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if ( uncompressedLen > 131072 )
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break;
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} else {
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// something bad happened
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goto end;
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}
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} while (Z_BUF_ERROR == zlibResult);
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if (Z_OK != zlibResult)
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goto end;
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} else if (!strncmp((char*)CHUNK_TYPE(data,index), "tEXt", 4)) {
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kdDebug(7034) << "We found a tEXt field\n";
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// the text comes after the key, but isn't null terminated
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uchar* text = &CHUNK_DATA(data,index, keysize+1);
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uint textsize = CHUNK_SIZE(data, index)-keysize-1;
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// security check, also considering overflow wraparound from the addition --
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// we may endup with a /smaller/ index if we wrap all the way around
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uint firstIndex = (uint)(text - data);
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uint onePastLastIndex = firstIndex + textsize;
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if ( onePastLastIndex > fileSize || onePastLastIndex <= firstIndex)
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goto end;
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arr.resize(textsize);
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arr = QByteArray(textsize).duplicate((const char*)text,
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textsize);
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} else {
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kdDebug(7034) << "We found a field, not expected though\n";
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goto end;
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}
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appendItem(commentGroup,
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QString(reinterpret_cast<char*>(key)),
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QString(arr));
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kdDebug(7034) << "adding " << key << " / "
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<< QString(arr) << endl;
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index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE;
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}
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}
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}
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}
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end:
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delete[] data;
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return true;
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}
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#include "kfile_png.moc"
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