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72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
7 years ago
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#include "cr2header_int.hpp"
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8 years ago
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namespace Exiv2 {
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namespace Internal {
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const char* Cr2Header::cr2sig_ = "CR\2\0";
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Cr2Header::Cr2Header(ByteOrder byteOrder)
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: TiffHeaderBase(42, 16, byteOrder, 0x00000010),
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offset2_(0x00000000)
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{
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}
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Cr2Header::~Cr2Header()
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{
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}
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bool Cr2Header::read(const byte* pData, uint32_t size)
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{
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if (size < 16) return false;
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if (pData[0] == 'I' && pData[0] == pData[1]) {
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setByteOrder(littleEndian);
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}
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else if (pData[0] == 'M' && pData[0] == pData[1]) {
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setByteOrder(bigEndian);
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}
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else {
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return false;
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}
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if (tag() != getUShort(pData + 2, byteOrder())) return false;
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setOffset(getULong(pData + 4, byteOrder()));
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if (0 != memcmp(pData + 8, cr2sig_, 4)) return false;
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offset2_ = getULong(pData + 12, byteOrder());
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return true;
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} // Cr2Header::read
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DataBuf Cr2Header::write() const
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{
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DataBuf buf(16);
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switch (byteOrder()) {
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case littleEndian:
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buf.pData_[0] = 'I';
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break;
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case bigEndian:
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buf.pData_[0] = 'M';
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break;
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case invalidByteOrder:
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assert(false);
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break;
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}
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buf.pData_[1] = buf.pData_[0];
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us2Data(buf.pData_ + 2, tag(), byteOrder());
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ul2Data(buf.pData_ + 4, 0x00000010, byteOrder());
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memcpy(buf.pData_ + 8, cr2sig_, 4);
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// Write a dummy value for the RAW IFD offset. The offset-writer is used to set this offset in a second pass.
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ul2Data(buf.pData_ + 12, 0x00000000, byteOrder());
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return buf;
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} // Cr2Header::write
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bool Cr2Header::isImageTag(uint16_t tag, IfdId group, const PrimaryGroups* /*pPrimaryGroups*/) const
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{
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// CR2 image tags are all IFD2 and IFD3 tags
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if (group == ifd2Id || group == ifd3Id) return true;
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// ...and any (IFD0) tag that is in the TIFF image tags list
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return isTiffImageTag(tag, group);
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}
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}} // namespace Internal, Exiv2
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