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DSTexCompress/FreeImage/Examples/Generic/LoadFromHandle.cpp

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+// ==========================================================
+// Load From Handle Example
+//
+// Design and implementation by 
+// - Herv<72> Drolon
+//
+// 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 own risk!
+// ==========================================================
+
+//   This example shows how to load a bitmap from a
+//   user allocated FILE pointer.
+// 
+// Functions used in this sample : 
+// FreeImage_GetFormatFromFIF, FreeImage_GetFileTypeFromHandle, FreeImage_LoadFromHandle, 
+// FreeImage_GetFIFFromFilename, FreeImage_Save, FreeImage_Unload
+// FreeImage_GetVersion, FreeImage_GetCopyrightMessage, FreeImage_SetOutputMessage
+//
+// ==========================================================
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "FreeImage.h"
+
+// ----------------------------------------------------------
+
+/**
+	FreeImage error handler
+	@param fif Format / Plugin responsible for the error 
+	@param message Error message
+*/
+void FreeImageErrorHandler(FREE_IMAGE_FORMAT fif, const char *message) {
+	printf("\n*** "); 
+	if(fif != FIF_UNKNOWN) {
+		printf("%s Format\n", FreeImage_GetFormatFromFIF(fif));
+	}
+	printf(message);
+	printf(" ***\n");
+}
+
+// ----------------------------------------------------------
+
+unsigned DLL_CALLCONV
+myReadProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
+	return fread(buffer, size, count, (FILE *)handle);
+}
+
+unsigned DLL_CALLCONV
+myWriteProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
+	return fwrite(buffer, size, count, (FILE *)handle);
+}
+
+int DLL_CALLCONV
+mySeekProc(fi_handle handle, long offset, int origin) {
+	return fseek((FILE *)handle, offset, origin);
+}
+
+long DLL_CALLCONV
+myTellProc(fi_handle handle) {
+	return ftell((FILE *)handle);
+}
+
+// ----------------------------------------------------------
+
+int 
+main(int argc, char *argv[]) {
+	
+	// call this ONLY when linking with FreeImage as a static library
+#ifdef FREEIMAGE_LIB
+	FreeImage_Initialise();
+#endif // FREEIMAGE_LIB
+
+	// initialize your own FreeImage error handler
+
+	FreeImage_SetOutputMessage(FreeImageErrorHandler);
+
+	// print version & copyright infos
+
+	printf(FreeImage_GetVersion());
+	printf("\n");
+	printf(FreeImage_GetCopyrightMessage());
+	printf("\n");
+
+
+	if(argc != 2) {
+		printf("Usage : LoadFromHandle <input file name>\n");
+		return 0;
+	}
+
+	// initialize your own IO functions
+
+	FreeImageIO io;
+
+	io.read_proc  = myReadProc;
+	io.write_proc = myWriteProc;
+	io.seek_proc  = mySeekProc;
+	io.tell_proc  = myTellProc;
+
+	FILE *file = fopen(argv[1], "rb");
+
+	if (file != NULL) {
+		// find the buffer format
+		FREE_IMAGE_FORMAT fif = FreeImage_GetFileTypeFromHandle(&io, (fi_handle)file, 0);
+
+		if(fif != FIF_UNKNOWN) {
+			// load from the file handle
+			FIBITMAP *dib = FreeImage_LoadFromHandle(fif, &io, (fi_handle)file, 0);
+
+			// save the bitmap as a PNG ...
+			const char *output_filename = "test.png";
+
+			// first, check the output format from the file name or file extension
+			FREE_IMAGE_FORMAT out_fif = FreeImage_GetFIFFromFilename(output_filename);
+
+			if(out_fif != FIF_UNKNOWN) {
+				// then save the file
+				FreeImage_Save(out_fif, dib, output_filename, 0);
+			}
+
+			// free the loaded FIBITMAP
+			FreeImage_Unload(dib);
+		}
+		fclose(file);
+	}
+
+	// call this ONLY when linking with FreeImage as a static library
+#ifdef FREEIMAGE_LIB
+	FreeImage_DeInitialise();
+#endif // FREEIMAGE_LIB
+
+	return 0;
+}