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src/Source/FreeImage/PluginJPEG.cpp  view on Meta::CPAN

// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================

#ifdef _MSC_VER 
#pragma warning (disable : 4786) // identifier was truncated to 'number' characters
#endif

extern "C" {
#define XMD_H
#undef FAR
#include <setjmp.h>

#include "../LibJPEG/jinclude.h"
#include "../LibJPEG/jpeglib.h"
#include "../LibJPEG/jerror.h"
}

#include "FreeImage.h"
#include "Utilities.h"

#include "../Metadata/FreeImageTag.h"


// ==========================================================
// Plugin Interface
// ==========================================================

static int s_format_id;

// ----------------------------------------------------------
//   Constant declarations
// ----------------------------------------------------------

#define INPUT_BUF_SIZE  4096	// choose an efficiently fread'able size 
#define OUTPUT_BUF_SIZE 4096    // choose an efficiently fwrite'able size

#define EXIF_MARKER		(JPEG_APP0+1)	// EXIF marker / Adobe XMP marker
#define ICC_MARKER		(JPEG_APP0+2)	// ICC profile marker
#define IPTC_MARKER		(JPEG_APP0+13)	// IPTC marker / BIM marker 

#define ICC_HEADER_SIZE 14				// size of non-profile data in APP2
#define MAX_BYTES_IN_MARKER 65533L		// maximum data length of a JPEG marker
#define MAX_DATA_BYTES_IN_MARKER 65519L	// maximum data length of a JPEG APP2 marker

#define MAX_JFXX_THUMB_SIZE (MAX_BYTES_IN_MARKER - 5 - 1)

#define JFXX_TYPE_JPEG 	0x10	// JFIF extension marker: JPEG-compressed thumbnail image
#define JFXX_TYPE_8bit 	0x11	// JFIF extension marker: palette thumbnail image
#define JFXX_TYPE_24bit	0x13	// JFIF extension marker: RGB thumbnail image

// ----------------------------------------------------------
//   Typedef declarations
// ----------------------------------------------------------

typedef struct tagErrorManager {
	/// "public" fields
	struct jpeg_error_mgr pub;
	/// for return to caller
	jmp_buf setjmp_buffer;
} ErrorManager;

typedef struct tagSourceManager {
	/// public fields
	struct jpeg_source_mgr pub;
	/// source stream
	fi_handle infile;
	FreeImageIO *m_io;
	/// start of buffer
	JOCTET * buffer;
	/// have we gotten any data yet ?
	boolean start_of_file;
} SourceManager;

typedef struct tagDestinationManager {
	/// public fields
	struct jpeg_destination_mgr pub;
	/// destination stream
	fi_handle outfile;
	FreeImageIO *m_io;
	/// start of buffer
	JOCTET * buffer;
} DestinationManager;

typedef SourceManager*		freeimage_src_ptr;
typedef DestinationManager* freeimage_dst_ptr;
typedef ErrorManager*		freeimage_error_ptr;

// ----------------------------------------------------------
//   Error handling
// ----------------------------------------------------------

/** Fatal errors (print message and exit) */
static inline void
JPEG_EXIT(j_common_ptr cinfo, int code) {
	freeimage_error_ptr error_ptr = (freeimage_error_ptr)cinfo->err;
	error_ptr->pub.msg_code = code;
	error_ptr->pub.error_exit(cinfo);
}

/** Nonfatal errors (we can keep going, but the data is probably corrupt) */
static inline void
JPEG_WARNING(j_common_ptr cinfo, int code) {
	freeimage_error_ptr error_ptr = (freeimage_error_ptr)cinfo->err;
	error_ptr->pub.msg_code = code;
	error_ptr->pub.emit_message(cinfo, -1);
}

/**
	Receives control for a fatal error.  Information sufficient to
	generate the error message has been stored in cinfo->err; call
	output_message to display it.  Control must NOT return to the caller;
	generally this routine will exit() or longjmp() somewhere.
*/
METHODDEF(void)
jpeg_error_exit (j_common_ptr cinfo) {
	freeimage_error_ptr error_ptr = (freeimage_error_ptr)cinfo->err;

	// always display the message
	error_ptr->pub.output_message(cinfo);

	// allow JPEG with unknown markers
	if(error_ptr->pub.msg_code != JERR_UNKNOWN_MARKER) {
	
		// let the memory manager delete any temp files before we die
		jpeg_destroy(cinfo);
		
		// return control to the setjmp point
		longjmp(error_ptr->setjmp_buffer, 1);		
	}
}

/**
	Actual output of any JPEG message.  Note that this method does not know
	how to generate a message, only where to send it.
*/