static size_t s_read(int fd, void* buf, size_t count)
{
std::map<int, FileInfo>::iterator iter;
iter = s_fileInfos.find(fd);
if (iter == s_fileInfos.end()) /* sanity check */
{
errno = EBADF;
return -1;
}
size_t size;
char *key=NULL;
switch (iter->second.encrypt)
{
case 0:
key = NULL;
break;
case 1:
key = s_codeKey;
break;
case 2:
key = s_assetsKey;
break;
}
if (key)
{
off_t curr = s_lseek(fd, 0, SEEK_CUR);
size = readHelper(fd, buf, count);
if (curr != (off_t)-1 && size != (size_t)-1)
for (size_t i = (curr<32)?(32-curr):0; i < size; ++i)
((char*)buf)[i] ^= key[(((curr+i)*13)+(((curr+i)/256)*31))%256];
}
else
{
size = readHelper(fd, buf, count);
}
return size;
}
TriMesh::TriMesh(Stream *_stream, int index)
: Shape(Properties()), m_tangents(NULL) {
ref<Stream> stream = _stream;
if (index != 0) {
/* Determine the position of the requested substream. This
is stored at the end of the file */
stream->setPos(stream->getSize() - sizeof(uint32_t));
uint32_t count = stream->readUInt();
if (index < 0 || index > (int) count) {
Log(EError, "Unable to unserialize mesh, "
"shape index is out of range! (requested %i out of 0..%i)",
index, count-1);
}
stream->setPos(stream->getSize() - sizeof(uint32_t) * (1+count-index));
// Seek to the correct position
stream->setPos(stream->readUInt());
}
if (stream->getByteOrder() != Stream::ELittleEndian)
Log(EError, "Tried to unserialize a shape from a stream, "
"which was not previously set to little endian byte order!");
short format = stream->readShort();
if (format == 0x1C04)
Log(EError, "Encountered a geometry file generated by an old "
"version of Mitsuba. Please re-import the scene to update this file "
"to the current format.");
if (format != MTS_FILEFORMAT_HEADER)
Log(EError, "Encountered an invalid file format!");
short version = stream->readShort();
if (version != MTS_FILEFORMAT_VERSION_V3)
Log(EError, "Encountered an incompatible file version!");
stream = new ZStream(stream);
uint32_t flags = stream->readUInt();
m_vertexCount = stream->readSize();
m_triangleCount = stream->readSize();
bool fileDoublePrecision = flags & EDoublePrecision;
m_faceNormals = flags & EFaceNormals;
m_positions = new Point[m_vertexCount];
readHelper(stream, fileDoublePrecision,
reinterpret_cast<Float *>(m_positions),
m_vertexCount, sizeof(Point)/sizeof(Float));
if (flags & EHasNormals) {
m_normals = new Normal[m_vertexCount];
readHelper(stream, fileDoublePrecision,
reinterpret_cast<Float *>(m_normals),
m_vertexCount, sizeof(Normal)/sizeof(Float));
} else {
m_normals = NULL;
}
if (flags & EHasTexcoords) {
m_texcoords = new Point2[m_vertexCount];
readHelper(stream, fileDoublePrecision,
reinterpret_cast<Float *>(m_texcoords),
m_vertexCount, sizeof(Point2)/sizeof(Float));
} else {
m_texcoords = NULL;
}
if (flags & EHasColors) {
m_colors = new Spectrum[m_vertexCount];
readHelper(stream, fileDoublePrecision,
reinterpret_cast<Float *>(m_colors),
m_vertexCount, sizeof(Spectrum)/sizeof(Float));
} else {
m_colors = NULL;
}
m_triangles = new Triangle[m_triangleCount];
stream->readUIntArray(reinterpret_cast<uint32_t *>(m_triangles),
m_triangleCount * sizeof(Triangle)/sizeof(uint32_t));
m_flipNormals = false;
}