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#ifndef __GIF_Handler_hpp__
#define __GIF_Handler_hpp__ 1
// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2008 Adobe Systems Incorporated
// All Rights Reserved
//
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
//
// This file includes implementation of GIF file metadata, according to GIF89a Specification.
// https://www.w3.org/Graphics/GIF/spec-gif89a.txt
// The Graphics Interchange Format(c) is the Copyright property of CompuServe Incorporated.
// GIF(sm) is a Service Mark property of CompuServe Incorporated.
// All Rights Reserved . http://www.w3.org/Consortium/Legal
//
//Derived from PNG_Handler.hpp by Ian Jacobi
// =================================================================================================
#include "public/include/XMP_Environment.h" // ! Must be the first #include!
#include "public/include/XMP_Const.h"
#include "public/include/XMP_IO.hpp"
#include "XMPFiles/source/XMPFiles_Impl.hpp"
// =================================================================================================
/// \file GIF_Handler.hpp
/// \brief File format handler for GIF.
///
/// This header ...
///
// =================================================================================================
// *** Could derive from Basic_Handler - buffer file tail in a temp file.
extern XMPFileHandler* GIF_MetaHandlerCTor ( XMPFiles* parent );
extern bool GIF_CheckFormat ( XMP_FileFormat format,
XMP_StringPtr filePath,
XMP_IO* fileRef,
XMPFiles* parent );
static const XMP_OptionBits kGIF_HandlerFlags = ( kXMPFiles_CanInjectXMP |
kXMPFiles_CanExpand |
kXMPFiles_PrefersInPlace |
kXMPFiles_AllowsOnlyXMP |
kXMPFiles_ReturnsRawPacket |
kXMPFiles_NeedsReadOnlyPacket
);
class GIF_MetaHandler : public XMPFileHandler
{
public:
void CacheFileData();
void ProcessXMP();
void UpdateFile ( bool doSafeUpdate );
void WriteTempFile ( XMP_IO* tempRef );
bool SafeWriteFile ();
GIF_MetaHandler ( XMPFiles* parent );
virtual ~GIF_MetaHandler();
private:
enum GIFBlockType
{
kXMP_block_ImageDesc = 0x2C,
kXMP_block_Extension = 0x21,
kXMP_block_Trailer = 0x3B,
kXMP_block_Header = 0x47
};
XMP_Uns64 XMPPacketOffset;
XMP_Uns32 XMPPacketLength;
XMP_Uns64 trailerOffset;
bool ParseGIFBlocks( XMP_IO * fileRef );
void ReadLogicalScreenDesc( XMP_IO* fileRef );
void SeekFile( XMP_IO * fileRef, XMP_Int64 offset, SeekMode mode );
}; // GIF_MetaHandler
// =================================================================================================
#endif /* __GIF_Handler_hpp__ */
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