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

// ==========================================================
// JPEG XR Loader & Writer
//
// Design and implementation by
// - Herve Drolon (drolon@infonie.fr)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// 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!
// ==========================================================

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

#include "../LibJXR/jxrgluelib/JXRGlue.h"

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

static int s_format_id;

// ==========================================================
// FreeImageIO interface (I/O streaming functions)
// ==========================================================

/**
JXR wrapper for FreeImage I/O handle
*/
typedef struct tagFreeImageJXRIO {
    FreeImageIO *io;
	fi_handle handle;
} FreeImageJXRIO;

static ERR 
_jxr_io_Read(WMPStream* pWS, void* pv, size_t cb) {
	FreeImageJXRIO *fio = (FreeImageJXRIO*)pWS->state.pvObj;
	return (fio->io->read_proc(pv, (unsigned)cb, 1, fio->handle) == 1) ? WMP_errSuccess : WMP_errFileIO;
}

static ERR 
_jxr_io_Write(WMPStream* pWS, const void* pv, size_t cb) {
	FreeImageJXRIO *fio = (FreeImageJXRIO*)pWS->state.pvObj;
	if(0 != cb) {
		return (fio->io->write_proc((void*)pv, (unsigned)cb, 1, fio->handle) == 1) ? WMP_errSuccess : WMP_errFileIO;
	}
	return WMP_errFileIO;
}

static ERR 
_jxr_io_SetPos(WMPStream* pWS, size_t offPos) {
	FreeImageJXRIO *fio = (FreeImageJXRIO*)pWS->state.pvObj;
    return (fio->io->seek_proc(fio->handle, (long)offPos, SEEK_SET) == 0) ? WMP_errSuccess : WMP_errFileIO;
}

static ERR 
_jxr_io_GetPos(WMPStream* pWS, size_t* poffPos) {
	FreeImageJXRIO *fio = (FreeImageJXRIO*)pWS->state.pvObj;
    long lOff = fio->io->tell_proc(fio->handle);
	if(lOff == -1) {
		return WMP_errFileIO;
	}
    *poffPos = (size_t)lOff;
	return WMP_errSuccess;
}

static Bool 
_jxr_io_EOS(WMPStream* pWS) {
	FreeImageJXRIO *fio = (FreeImageJXRIO*)pWS->state.pvObj;
    long currentPos = fio->io->tell_proc(fio->handle);
    fio->io->seek_proc(fio->handle, 0, SEEK_END);
    long fileRemaining = fio->io->tell_proc(fio->handle) - currentPos;
    fio->io->seek_proc(fio->handle, currentPos, SEEK_SET);
    return (fileRemaining > 0);
}

static ERR 
_jxr_io_Close(WMPStream** ppWS) {
	WMPStream *pWS = *ppWS;
	// HACK : we use fMem to avoid a stream destruction by the library
	// because FreeImage MUST HAVE the ownership of the stream
	// see _jxr_io_Create
	if(pWS && pWS->fMem) {
		free(pWS);