bool isTiffType(BasicIo& iIo, bool advance)
{
const int32_t len = 8;
byte buf[len];
iIo.read(buf, len);
if (iIo.error() || iIo.eof()) {
return false;
}
TiffHeade2 tiffHeader;
bool rc = tiffHeader.read(buf, len);
if (!advance || !rc) {
iIo.seek(-len, BasicIo::cur);
}
return rc;
}
bool Nikon3MnHeader::read(const byte* pData,
uint32_t size,
ByteOrder /*byteOrder*/)
{
assert (pData != 0);
if (size < size_) return false;
if (0 != memcmp(pData, signature_, 6)) return false;
buf_.alloc(size_);
std::memcpy(buf_.pData_, pData, buf_.size_);
TiffHeade2 th;
if (!th.read(buf_.pData_ + 10, 8)) return false;
byteOrder_ = th.byteOrder();
start_ = 10 + th.offset();
return true;
} // Nikon3MnHeader::read
TiffComponent* newNikonMn(uint16_t tag,
uint16_t group,
uint16_t /*mnGroup*/,
const byte* pData,
uint32_t size,
ByteOrder /*byteOrder*/)
{
// If there is no "Nikon" string it must be Nikon1 format
if (size < 6 || std::string(reinterpret_cast<const char*>(pData), 6)
!= std::string("Nikon\0", 6)) {
return new TiffIfdMakernote(tag, group, Group::nikon1mn, 0);
}
// If the "Nikon" string is not followed by a TIFF header, we assume
// Nikon2 format
TiffHeade2 tiffHeader;
if ( size < 18
|| !tiffHeader.read(pData + 10, size - 10)
|| tiffHeader.tag() != 0x002a) {
return new TiffIfdMakernote(tag, group, Group::nikon2mn, new Nikon2MnHeader);
}
// Else we have a Nikon3 makernote
return new TiffIfdMakernote(tag, group, Group::nikon3mn, new Nikon3MnHeader);
}
