off_t _vfzSeek(struct VFile* vf, off_t offset, int whence) {
struct VFileZip* vfz = (struct VFileZip*) vf;
int64_t currentPos = unztell64(vfz->z);
int64_t pos;
switch (whence) {
case SEEK_SET:
pos = 0;
break;
case SEEK_CUR:
pos = unztell64(vfz->z);
break;
case SEEK_END:
pos = vfz->fileSize;
break;
default:
return -1;
}
if (pos < 0 || pos + offset < 0) {
return -1;
}
pos += offset;
if (currentPos > pos) {
unzCloseCurrentFile(vfz->z);
unzOpenCurrentFile(vfz->z);
currentPos = 0;
}
while (currentPos < pos) {
char tempBuf[1024];
ssize_t toRead = sizeof(tempBuf);
if (toRead > pos - currentPos) {
toRead = pos - currentPos;
}
ssize_t read = vf->read(vf, tempBuf, toRead);
if (read < toRead) {
return -1;
}
currentPos += read;
}
return unztell64(vfz->z);
}
Position GetPos(void) const
{
return unztell64(handle);
}
qint64 UnzipFile::pos() const
{
return unztell64(d->archive->d->unzip);
}