mirror of
https://github.com/tumic0/GPXSee.git
synced 2025-07-09 00:34:27 +02:00
121 lines
2.3 KiB
C++
121 lines
2.3 KiB
C++
#include <QFile>
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#include "img.h"
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#include "subfile.h"
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SubFile::Type SubFile::type(const char str[3])
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{
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if (!memcmp(str, "TRE", 3))
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return TRE;
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else if (!memcmp(str, "RGN", 3))
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return RGN;
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else if (!memcmp(str, "LBL", 3))
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return LBL;
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else if (!memcmp(str, "TYP", 3))
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return TYP;
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else if (!memcmp(str, "GMP", 3))
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return GMP;
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else if (!memcmp(str, "NET", 3))
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return NET;
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else
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return Unknown;
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}
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SubFile::SubFile(QFile *file) :_gmpOffset(0), _img(0), _file(file), _blocks(0)
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{
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if (!_file->open(QIODevice::ReadOnly))
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qWarning("Error opening %s: %s", qPrintable(_file->fileName()),
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qPrintable(_file->errorString()));
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}
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bool SubFile::seek(Handle &handle, quint32 pos) const
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{
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Q_ASSERT(_img || _file);
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if (_file)
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return _file->seek(pos);
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else {
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quint32 blockSize = _img->blockSize();
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int blockNum = pos / blockSize;
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if (handle.blockNum != blockNum) {
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if (blockNum >= _blocks->size())
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return false;
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if (!_img->readBlock(_blocks->at(blockNum), handle.data))
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return false;
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handle.blockNum = blockNum;
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}
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handle.blockPos = pos % blockSize;
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handle.pos = pos;
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return true;
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}
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}
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bool SubFile::readByte(Handle &handle, quint8 &val) const
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{
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Q_ASSERT(_img || _file);
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if (_file)
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return _file->getChar((char*)&val);
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else {
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val = handle.data.at(handle.blockPos++);
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handle.pos++;
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return (handle.blockPos >= _img->blockSize())
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? seek(handle, handle.pos) : true;
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}
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}
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bool SubFile::readVUInt32(Handle &hdl, quint32 &val) const
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{
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quint8 bytes, shift, b;
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if (!readByte(hdl, b))
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return false;
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if ((b & 1) == 0) {
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if ((b & 2) == 0) {
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bytes = ((b >> 2) & 1) ^ 3;
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shift = 5;
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} else {
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shift = 6;
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bytes = 1;
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}
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} else {
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shift = 7;
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bytes = 0;
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}
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val = b >> (8 - shift);
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for (int i = 1; i <= bytes; i++) {
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if (!readByte(hdl, b))
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return false;
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val |= (((quint32)b) << (i * 8)) >> (8 - shift);
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}
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return true;
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}
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QString SubFile::fileName() const
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{
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return _file ? _file->fileName() : _img->fileName();
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}
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#ifndef QT_NO_DEBUG
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QDebug operator<<(QDebug dbg, const SubFile &file)
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{
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bool continuous = true;
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for (int i = 1; i < file._blocks->size(); i++) {
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if (file._blocks->at(i) != file._blocks->at(i-1) + 1) {
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continuous = false;
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break;
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}
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}
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dbg.nospace() << "SubFile(" << file._blocks->size() << ", "
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<< continuous << ")";
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return dbg.space();
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}
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#endif // QT_NO_DEBUG
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