| -rw-r--r-- | noncore/graphics/opie-eye/slave/png_slave.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/noncore/graphics/opie-eye/slave/png_slave.cpp b/noncore/graphics/opie-eye/slave/png_slave.cpp index 86e1cdc..21555b4 100644 --- a/noncore/graphics/opie-eye/slave/png_slave.cpp +++ b/noncore/graphics/opie-eye/slave/png_slave.cpp @@ -1,211 +1,212 @@ #include "png_slave.h" #include "thumbnailtool.h" #include <qobject.h> #include <qfile.h> #include <qimage.h> #include <qpixmap.h> #include <qstring.h> /* * GPLv2 from kfile plugin */ PHUNK_VIEW_INTERFACE( "PNG", PNGSlave ); #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] /* TRANSLATOR QObject */ // known translations for common png keys static const char* knownTranslations[] #ifdef __GNUC__ __attribute__((unused)) #endif = { QT_TR_NOOP("Title"), QT_TR_NOOP("Author"), QT_TR_NOOP("Description"), QT_TR_NOOP("Copyright"), QT_TR_NOOP("Creation Time"), QT_TR_NOOP("Software"), QT_TR_NOOP("Disclaimer"), QT_TR_NOOP("Warning"), QT_TR_NOOP("Source"), QT_TR_NOOP("Comment") }; // and for the colors static const char* colors[] = { QT_TR_NOOP("Grayscale"), QT_TR_NOOP("Unknown"), QT_TR_NOOP("RGB"), QT_TR_NOOP("Palette"), QT_TR_NOOP("Grayscale/Alpha"), QT_TR_NOOP("Unknown"), QT_TR_NOOP("RGB/Alpha") }; // and compressions static const char* compressions[] = { QT_TR_NOOP("Deflate") }; // interlaced modes static const char* interlaceModes[] = { QT_TR_NOOP("None"), QT_TR_NOOP("Adam7") }; static void read_comment( const QString& inf, bool readComments, QString& str ) { QFile f(inf); - f.open(IO_ReadOnly); + if (!f.exists()) return; + if (!f.open(IO_ReadOnly)) return; if (f.size() < 26) return; // the technical group will be read from the first 26 bytes. If the file // is smaller, we can't even read this. uchar *data = new uchar[f.size()+1]; f.readBlock(reinterpret_cast<char*>(data), f.size()); data[f.size()]='\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]; // 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; } str = QObject::tr("Dimensions: %1x%2\n" ).arg(x).arg(y); str += QObject::tr("Depth: %1\n" ).arg(bpp); str += QObject::tr("ColorMode: %1\n").arg( (type < sizeof(colors)/sizeof(colors[0])) ? QObject::tr(colors[data[25]]) : QObject::tr("Unknown") ); str += QObject::tr("Compression: %1\n").arg( (data[26] < sizeof(compressions)/sizeof(compressions[0])) ? QObject::tr(compressions[data[26]]) : QObject::tr("Unknown") ); str += QObject::tr("InterlaceMode: %1\n" ).arg( (data[28] < sizeof(interlaceModes)/sizeof(interlaceModes[0])) ? QObject::tr(interlaceModes[data[28]]) : QObject::tr("Unknown")); } if ( readComments ) { uint index = 8; index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE; while(index<f.size()-12) { while (index < f.size() - 12 && strncmp((char*)CHUNK_TYPE(data,index), "tEXt", 4)) { if (!strncmp((char*)CHUNK_TYPE(data,index), "IEND", 4)) goto end; index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE; } if (index < f.size() - 12) { // we found a tEXt 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>=f.size()) goto end; // 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 > f.size() || onePastLastIndex <= firstIndex) goto end; QByteArray arr(textsize); arr = QByteArray(textsize).duplicate((const char*)text, textsize); str += QObject::tr( QString(reinterpret_cast<char*>(key)), QString(arr) ); index += CHUNK_SIZE(data, index) + CHUNK_HEADER_SIZE; } } } } end: delete[] data; } PNGSlave::PNGSlave() : SlaveInterface("png") { } PNGSlave::~PNGSlave() { } QString PNGSlave::iconViewName( const QString& path) { QString str; read_comment( path, false, str ); return str; } QString PNGSlave::fullImageInfo( const QString& path) { QString str = "<qt>"; read_comment( path, true, str ); str += "</qt>"; return str; } QPixmap PNGSlave::pixmap( const QString& path, int width, int height) { QImage img; img.load( path ); if ( img.isNull() ) return QPixmap(); else return ThumbNailTool::scaleImage( img, width,height ); } |