Mercurial > resize-gd

comparison resize-gd.c @ 10:6b8e8fcd6d4d

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added error handling
author meillo@marmaro.de
date Sat, 14 Jun 2008 18:08:03 +0200
parents c0045d8d3ce2
children 6f5c3a02e4d5
comparison
equal deleted inserted replaced
9:a3547175f466 10:6b8e8fcd6d4d
12 #include <string.h> 12 #include <string.h>
13 #include <ctype.h> 13 #include <ctype.h>
14 #include "gd.h" 14 #include "gd.h"
15 15
16 #define PROGRAM "resize-gd" 16 #define PROGRAM "resize-gd"
17 #define VERSION "0.1" 17 #define VERSION "0.2"
18 18
19 enum { 19 enum {
20 Png, 20 Png,
21 Jpg 21 Jpg
22 }; 22 };
126 } 126 }
127 127
128 128
129 /* process images */ 129 /* process images */
130 for (i = 2; i < argc; i++) { 130 for (i = 2; i < argc; i++) {
131 printf("processing file '%s'\n", argv[i]); 131 /* printf("processing file '%s'\n", argv[i]); */
132 132
133 if (strcmp(argv[i]+strlen(argv[i])-4, ".png") == 0) { 133 if (strcmp(argv[i]+strlen(argv[i])-4, ".png") == 0) {
134 type = Png; 134 type = Png;
135 } else if (strcmp(argv[i]+strlen(argv[i])-4, ".jpg") == 0) { 135 } else if (strcmp(argv[i]+strlen(argv[i])-4, ".jpg") == 0) {
136 type = Jpg; 136 type = Jpg;
139 continue; 139 continue;
140 } 140 }
141 141
142 /* load image */ 142 /* load image */
143 in = fopen(argv[i], "rb"); 143 in = fopen(argv[i], "rb");
144 if (in == NULL) {
145 fprintf(stderr, "unable to open '%s' for reading\n", argv[i]);
146 continue;
147 }
144 if (type == Png) { 148 if (type == Png) {
145 im_in = gdImageCreateFromPng(in); 149 im_in = gdImageCreateFromPng(in);
146 } else if (type == Jpg) { 150 } else if (type == Jpg) {
147 im_in = gdImageCreateFromJpeg(in); 151 im_in = gdImageCreateFromJpeg(in);
152 }
153 if (im_in == NULL) {
154 fprintf(stderr, "unable to load image '%s'\n", argv[i]);
155 continue;
148 } 156 }
149 fclose(in); 157 fclose(in);
150 158
151 /* calculate target size */ 159 /* calculate target size */
152 sizeimg.w = im_in->sx; 160 sizeimg.w = im_in->sx;
159 continue; 167 continue;
160 } 168 }
161 169
162 /* copy-resize the image */ 170 /* copy-resize the image */
163 im_out = gdImageCreateTrueColor(sizedest.w, sizedest.h); 171 im_out = gdImageCreateTrueColor(sizedest.w, sizedest.h);
172 if (im_out == NULL) {
173 fprintf(stderr, "unable to allocate memory for resized image\n");
174 exit(3);
175 }
164 gdImageCopyResampled(im_out, im_in, 0, 0, 0, 0, im_out->sx, im_out->sy, im_in->sx, im_in->sy); 176 gdImageCopyResampled(im_out, im_in, 0, 0, 0, 0, im_out->sx, im_out->sy, im_in->sx, im_in->sy);
165 177
166 /* write image */ 178 /* write image */
167 out = fopen(argv[i], "wb"); 179 out = fopen(argv[i], "wb");
180 if (out == NULL) {
181 fprintf(stderr, "unable to open '%s' for writing\n", argv[i]);
182 continue;
183 }
168 if (type == Png) { 184 if (type == Png) {
169 gdImagePng(im_out, out); 185 gdImagePng(im_out, out);
170 } else if (type == Jpg) { 186 } else if (type == Jpg) {
171 gdImageJpeg(im_out, out, -1); 187 gdImageJpeg(im_out, out, -1);
172 } 188 }