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src/Source/FreeImage/PluginG3.cpp  view on Meta::CPAN

// ==========================================================
// G3 Fax Loader
//
// Design and implementation by
// - Hervé Drolon (drolon@infonie.fr)
// - Petr Pytelka (pyta@lightcomp.com)
//
// 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 "../LibTIFF4/tiffiop.h"

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

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

static int s_format_id;

// ==========================================================
//   Constant/Macro declarations
// ==========================================================

#define G3_DEFAULT_WIDTH	1728

#define TIFFhowmany8(x) (((x)&0x07)?((uint32)(x)>>3)+1:(uint32)(x)>>3)

// ==========================================================
//   libtiff interface 
// ==========================================================

static tmsize_t 
_g3ReadProc(thandle_t handle, void *buf, tmsize_t size) {
	// returns an error when reading the TIFF header
	return 0;
}

static tmsize_t
_g3WriteProc(thandle_t handle, void *buf, tmsize_t size) {
	// returns ok when writing the TIFF header
	return size;
}

static toff_t
_g3SeekProc(thandle_t handle, toff_t off, int whence) {
	return 0;
}

static int
_g3CloseProc(thandle_t handle) {
	return 0;
}

static toff_t
_g3SizeProc(thandle_t handle) {
	return 0;
}

static int
_g3MapProc(thandle_t, void** base, toff_t* size) {
	return 0;
}

static void
_g3UnmapProc(thandle_t, void* base, toff_t size) {
}

// --------------------------------------------------------------

static tmsize_t
G3GetFileSize(FreeImageIO *io, fi_handle handle) {
    long currentPos = io->tell_proc(handle);
    io->seek_proc(handle, 0, SEEK_END);
    long fileSize = io->tell_proc(handle);
    io->seek_proc(handle, currentPos, SEEK_SET);
    return fileSize;
}

static BOOL 
G3ReadFile(FreeImageIO *io, fi_handle handle, uint8 *tif_rawdata, tmsize_t tif_rawdatasize) {
	return ((tmsize_t)(io->read_proc(tif_rawdata, (unsigned)tif_rawdatasize, 1, handle) * tif_rawdatasize) == tif_rawdatasize);