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62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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#include "cr2header_int.hpp"
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namespace Exiv2::Internal {
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Cr2Header::Cr2Header(ByteOrder byteOrder) : TiffHeaderBase(42, 16, byteOrder, 0x00000010) {
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}
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bool Cr2Header::read(const byte* pData, size_t size) {
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if (!pData || size < 16) {
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return false;
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}
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if (pData[0] == 'I' && pData[0] == pData[1]) {
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setByteOrder(littleEndian);
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} else if (pData[0] == 'M' && pData[0] == pData[1]) {
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setByteOrder(bigEndian);
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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()))
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return false;
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setOffset(getULong(pData + 4, byteOrder()));
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if (0 != memcmp(pData + 8, cr2sig_, 4))
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return false;
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offset2_ = getULong(pData + 12, byteOrder());
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return true;
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}
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DataBuf Cr2Header::write() const {
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DataBuf buf(16);
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switch (byteOrder()) {
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case littleEndian:
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buf.write_uint8(0, 'I');
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break;
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case bigEndian:
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buf.write_uint8(0, 'M');
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break;
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default:
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break;
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}
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buf.write_uint8(1, buf.read_uint8(0));
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buf.write_uint16(2, tag(), byteOrder());
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buf.write_uint32(4, 0x00000010, byteOrder());
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std::copy_n(cr2sig_, 4, buf.begin() + 8);
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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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buf.write_uint32(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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// CR2 image tags are all IFD2 and IFD3 tags
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if (group == IfdId::ifd2Id || group == IfdId::ifd3Id)
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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 Exiv2::Internal
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