diff options
Diffstat (limited to 'kfile-plugins/png/kfile_png.cpp')
| -rw-r--r-- | kfile-plugins/png/kfile_png.cpp | 315 |
1 files changed, 0 insertions, 315 deletions
diff --git a/kfile-plugins/png/kfile_png.cpp b/kfile-plugins/png/kfile_png.cpp deleted file mode 100644 index 531fdfe3..00000000 --- a/kfile-plugins/png/kfile_png.cpp +++ /dev/null @@ -1,315 +0,0 @@ -/* This file is part of the KDE project - * Copyright (C) 2001, 2002 Rolf Magnus <[email protected]> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public - * License as published by the Free Software Foundation version 2. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; see the file COPYING. If not, write to - * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, - * Boston, MA 02110-1301, USA. - * - * $Id$ - */ - -#include <stdlib.h> -#include "kfile_png.h" - -#include <kurl.h> -#include <kprocess.h> -#include <klocale.h> -#include <kgenericfactory.h> -#include <kdebug.h> - -#include <tqcstring.h> -#include <tqfile.h> -#include <tqdatetime.h> -#include <tqdict.h> -#include <tqvalidator.h> -#include <zlib.h> - -// some defines to make it easier -// don't tell me anything about preprocessor usage :) -#define CHUNK_SIZE(data, index) ((data[index ]<<24) + (data[index+1]<<16) + \ - (data[index+2]<< 8) + data[index+3]) -#define CHUNK_TYPE(data, index) &data[index+4] -#define CHUNK_HEADER_SIZE 12 -#define CHUNK_DATA(data, index, offset) data[8+index+offset] - -// known translations for common png keys -static const char* knownTranslations[] -#ifdef __GNUC__ -__attribute__((unused)) -#endif - = { - I18N_NOOP("Title"), - I18N_NOOP("Author"), - I18N_NOOP("Description"), - I18N_NOOP("Copyright"), - I18N_NOOP("Creation Time"), - I18N_NOOP("Software"), - I18N_NOOP("Disclaimer"), - I18N_NOOP("Warning"), - I18N_NOOP("Source"), - I18N_NOOP("Comment") -}; - -// and for the colors -static const char* colors[] = { - I18N_NOOP("Grayscale"), - I18N_NOOP("Unknown"), - I18N_NOOP("RGB"), - I18N_NOOP("Palette"), - I18N_NOOP("Grayscale/Alpha"), - I18N_NOOP("Unknown"), - I18N_NOOP("RGB/Alpha") -}; - - // and compressions -static const char* compressions[] = -{ - I18N_NOOP("Deflate") -}; - - // interlaced modes -static const char* interlaceModes[] = { - I18N_NOOP("None"), - I18N_NOOP("Adam7") -}; - -typedef KGenericFactory<KPngPlugin> PngFactory; - -K_EXPORT_COMPONENT_FACTORY(kfile_png, PngFactory("kfile_png")) - -KPngPlugin::KPngPlugin(TQObject *parent, const char *name, - const TQStringList &args) - : KFilePlugin(parent, name, args) -{ - kdDebug(7034) << "png plugin\n"; - - // set up our mime type - KFileMimeTypeInfo* info = addMimeTypeInfo( "image/png" ); - - KFileMimeTypeInfo::GroupInfo* group = 0; - KFileMimeTypeInfo::ItemInfo* item = 0; - - // comment group - group = addGroupInfo(info, "Comment", i18n("Comment")); - addVariableInfo(group, TQVariant::String, 0); - - // technical group - group = addGroupInfo(info, "Technical", i18n("Technical Details")); - - item = addItemInfo(group, "Dimensions", i18n("Dimensions"), TQVariant::Size); - setHint( item, KFileMimeTypeInfo::Size ); - setUnit(item, KFileMimeTypeInfo::Pixels); - - item = addItemInfo(group, "BitDepth", i18n("Bit Depth"), TQVariant::Int); - setUnit(item, KFileMimeTypeInfo::BitsPerPixel); - - addItemInfo(group, "ColorMode", i18n("Color Mode"), TQVariant::String); - addItemInfo(group, "Compression", i18n("Compression"), TQVariant::String); - addItemInfo(group, "InterlaceMode", i18n("Interlace Mode"),TQVariant::String); -} - -bool KPngPlugin::readInfo( KFileMetaInfo& info, uint what) -{ - if ( info.path().isEmpty() ) // remote file - return false; - TQFile f(info.path()); - if ( !f.open(IO_ReadOnly) ) - return false; - - TQIODevice::Offset fileSize = f.size(); - - if (fileSize < 29) return false; - // the technical group will be read from the first 29 bytes. If the file - // is smaller, we can't even read this. - - bool readComments = false; - if (what & (KFileMetaInfo::Fastest | - KFileMetaInfo::DontCare | - KFileMetaInfo::ContentInfo)) readComments = true; - else - fileSize = 29; // No need to read more - - uchar *data = new uchar[fileSize+1]; - f.readBlock(reinterpret_cast<char*>(data), fileSize); - data[fileSize]='\n'; - - // find the start - if (data[0] == 137 && data[1] == 80 && data[2] == 78 && data[3] == 71 && - data[4] == 13 && data[5] == 10 && data[6] == 26 && data[7] == 10 ) - { - // ok - // the IHDR chunk should be the first - if (!strncmp((char*)&data[12], "IHDR", 4)) - { - // we found it, get the dimensions - ulong x,y; - x = (data[16]<<24) + (data[17]<<16) + (data[18]<<8) + data[19]; - y = (data[20]<<24) + (data[21]<<16) + (data[22]<<8) + data[23]; - - uint type = data[25]; - uint bpp = data[24]; - kdDebug(7034) << "dimensions " << x << "*" << y << endl; - - // the bpp are only per channel, so we need to multiply the with - // the channel count - switch (type) - { - case 0: break; // Grayscale - case 2: bpp *= 3; break; // RGB - case 3: break; // palette - case 4: bpp *= 2; break; // grayscale w. alpha - case 6: bpp *= 4; break; // RGBA - - default: // we don't get any sensible value here - bpp = 0; - } - - KFileMetaInfoGroup techgroup = appendGroup(info, "Technical"); - - appendItem(techgroup, "Dimensions", TQSize(x, y)); - appendItem(techgroup, "BitDepth", bpp); - appendItem(techgroup, "ColorMode", - (type < sizeof(colors)/sizeof(colors[0])) - ? i18n(colors[data[25]]) : i18n("Unknown")); - - appendItem(techgroup, "Compression", - (data[26] < sizeof(compressions)/sizeof(compressions[0])) - ? i18n(compressions[data[26]]) : i18n("Unknown")); - - appendItem(techgroup, "InterlaceMode", - (data[28] < sizeof(interlaceModes)/sizeof(interlaceModes[0])) - ? i18n(interlaceModes[data[28]]) : i18n("Unknown")); - } - - // look for a tEXt chunk - if (readComments) - { - uint index = 8; - index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE; - KFileMetaInfoGroup commentGroup = appendGroup(info, "Comment"); - - while(index<fileSize-12) - { - while (index < fileSize - 12 && - strncmp((char*)CHUNK_TYPE(data,index), "tEXt", 4) && - strncmp((char*)CHUNK_TYPE(data,index), "zTXt", 4)) - - { - if (!strncmp((char*)CHUNK_TYPE(data,index), "IEND", 4)) - goto end; - - index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE; - } - - if (index < fileSize - 12) - { - // we found a tEXt or zTXt field - - // get the key, it's a null terminated string at the - // chunk start - - uchar* key = &CHUNK_DATA(data,index,0); - - int keysize=0; - for (;key[keysize]!=0; keysize++) - // look if we reached the end of the file - // (it might be corrupted) - if (8+index+keysize>=fileSize) - goto end; - - TQByteArray arr; - if(!strncmp((char*)CHUNK_TYPE(data,index), "zTXt", 4)) { - kdDebug(7034) << "We found a zTXt field\n"; - // we get the compression method after the key - uchar* compressionMethod = &CHUNK_DATA(data,index,keysize+1); - if ( *compressionMethod != 0x00 ) { - // then it isn't zlib compressed and we are sunk - kdDebug(7034) << "Non-standard compression method." << endl; - goto end; - } - // compressed string after the compression technique spec - uchar* compressedText = &CHUNK_DATA(data, index, keysize+2); - uint compressedTextSize = CHUNK_SIZE(data, index)-keysize-2; - - // security check, also considering overflow wraparound from the addition -- - // we may endup with a /smaller/ index if we wrap all the way around - uint firstIndex = (uint)(compressedText - data); - uint onePastLastIndex = firstIndex + compressedTextSize; - if ( onePastLastIndex > fileSize || onePastLastIndex <= firstIndex) - goto end; - - uLongf uncompressedLen = compressedTextSize * 2; // just a starting point - int zlibResult; - do { - arr.resize(uncompressedLen); - zlibResult = uncompress((Bytef*)arr.data(), &uncompressedLen, - compressedText, compressedTextSize); - if (Z_OK == zlibResult) { - // then it is all OK - arr.resize(uncompressedLen); - } else if (Z_BUF_ERROR == zlibResult) { - // the uncompressedArray needs to be larger - // kdDebug(7034) << "doubling size for decompression" << endl; - uncompressedLen *= 2; - - // DoS protection. can't be bigger than 64k - if ( uncompressedLen > 131072 ) - break; - } else { - // something bad happened - goto end; - } - } while (Z_BUF_ERROR == zlibResult); - - if (Z_OK != zlibResult) - goto end; - } else if (!strncmp((char*)CHUNK_TYPE(data,index), "tEXt", 4)) { - kdDebug(7034) << "We found a tEXt field\n"; - // the text comes after the key, but isn't null terminated - uchar* text = &CHUNK_DATA(data,index, keysize+1); - uint textsize = CHUNK_SIZE(data, index)-keysize-1; - - // security check, also considering overflow wraparound from the addition -- - // we may endup with a /smaller/ index if we wrap all the way around - uint firstIndex = (uint)(text - data); - uint onePastLastIndex = firstIndex + textsize; - - if ( onePastLastIndex > fileSize || onePastLastIndex <= firstIndex) - goto end; - - arr.resize(textsize); - arr = TQByteArray(textsize).duplicate((const char*)text, - textsize); - - } else { - kdDebug(7034) << "We found a field, not expected though\n"; - goto end; - } - appendItem(commentGroup, - TQString(reinterpret_cast<char*>(key)), - TQString(arr)); - - kdDebug(7034) << "adding " << key << " / " - << TQString(arr) << endl; - - index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE; - } - } - } - } -end: - delete[] data; - return true; -} - -#include "kfile_png.moc" |