File: webgif.c

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/* Bring in the gd library functions */
#include "gd.h"

/* Bring in standard I/O and string manipulation functions */
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{
	FILE *in;
	FILE *out;
	char outFn[20];
	int useStdinStdout=0;

	/* Declare our image pointer */
	gdImagePtr im = 0;
	int i;
       /* We'll clear 'no' once we know the user has made a
		reasonable request. */
	int no = 1;
	/* We'll set 'write' once we know the user's request
		requires that the image be written back to disk. */
	int write = 0;
	/* C programs always get at least one argument; we want at
		least one more (the image), more in practice. */
	if (argc < 2 || !strcmp(argv[1], "--help")) {
		no = 1;	
		goto usage;
	}

	/* The last argument should be the image. Open the file. */
	if (strcmp("-", argv[argc-1])==0) { /* - is synonymous with STDIN */
	  useStdinStdout = 1;
	  in = stdin;
	} else {
	  in = fopen(argv[argc-1], "rb");	
	}
	if (!in) {
		fprintf(stderr,
			"Error: can't open file %s.\n", argv[argc-1]);
		exit(1);
	}
	/* Now load the image. */	
	im = gdImageCreateFromGif(in);
	fclose(in);
	/* If the load failed, it must not be a GIF file. */
	if (!im) {
		fprintf(stderr,
			"Error: %s is not a valid gif file.\n", argv[argc-1]);
		exit(1);	
	}
	/* Consider each argument in turn. */
	for (i=1; (i < (argc-1)); i++) {
		/* -i turns on and off interlacing. */
		if (!strcmp(argv[i], "--help")) { 
		  /* Every program should use this for help! :) */
		  no = 1;
		  goto usage;
		} else if (!strcmp(argv[i], "-i")) {
			if (i == (argc-2)) {
				fprintf(stderr, 
				"Error: -i specified without y or n.\n");
				no = 1;
				goto usage;
			}
			if (!strcmp(argv[i+1], "y")) {
				/* Set interlace. */
				gdImageInterlace(im, 1);
			} else if (!strcmp(argv[i+1], "n")) {
				/* Clear interlace. */
				gdImageInterlace(im, 0);
			} else {
				fprintf(stderr,
				"Error: -i specified without y or n.\n");
				no = 1;
				goto usage;
			}
			i++;
			no = 0;
			write = 1;
		} else if (!strcmp(argv[i], "-t")) {
			/* Set transparent index (or none). */
			int index;
			if (i == (argc-2)) {
				fprintf(stderr,
		"Error: -t specified without a color table index.\n");
				no = 1;
				goto usage;
			}
			if (!strcmp(argv[i+1], "none")) {
				/* -1 means not transparent. */
				gdImageColorTransparent(im, -1);
			} else {
				/* OK, get an integer and set the index. */
				index = atoi(argv[i+1]);
				gdImageColorTransparent(im, index);
			}
			i++;
			write = 1;
			no = 0;
		} else if (!strcmp(argv[i], "-l")) {
			/* List the colors in the color table. */
			int j;
			/* Tabs used below. */
			printf("Index	Red	Green	Blue\n");
			for (j=0; (j < gdImageColorsTotal(im)); j++) {
				/* Use access macros to learn colors. */
				printf("%d	%d	%d	%d\n",
					j, 
					gdImageRed(im, j),
					gdImageGreen(im, j),
					gdImageBlue(im, j));
			}
			no = 0;
		} else if (!strcmp(argv[i], "-d")) {
			/* Output dimensions, etc. */
			int t;
			printf("Width: %d Height: %d Colors: %d\n",
				gdImageSX(im), gdImageSY(im),
				gdImageColorsTotal(im));
			t = gdImageGetTransparent(im);
			if (t != (-1)) {
				printf("Transparent index: %d\n", t);
			} else {
				/* -1 means the image is not transparent. */
				printf("Transparent index: none\n");
			}
			if (gdImageGetInterlaced(im)) {
				printf("Interlaced: yes\n");	
			} else {
				printf("Interlaced: no\n");	
			}
			no = 0;
		} else {
			fprintf(stderr, "Unknown argument: %s\n", argv[i]);
			break;	
		}
	}
usage:
	if (no) {
		/* If the command failed, output an explanation. */
		fprintf(stderr, 
"Usage: webgif [-i y|n ] [-l] [-t index|off ] [-d] gifname.gif\n"

"  -i [y|n]   Turns on/off interlace\n"
"  -l         Prints the table of color indexes\n"
"  -t [index] Set the transparent color to the specified index (0-255 or none)\n"
"  -d         Reports the dimensions and other characteristics of the image.\n"
"\n"
"If you specify '-' as the input file, stdin/stdout will be used input/output.\n"
);
	} 
	if (write) {
	  if (useStdinStdout) {
	    out = stdout;
	  } else {
	    /* Open a temporary file. */

	    /* "temp.tmp" is not good temporary filename. */
	    sprintf(outFn, "webgif.tmp%d", getpid());
	    out = fopen(outFn, "wb"); 

	    if (!out) {
	      fprintf(stderr,
		      "Unable to write to %s -- exiting\n", outFn);
	      exit(1);
	    }
	  }

	  /* Write the new gif. */
	  gdImageGif(im, out);

	  if (!useStdinStdout) {
	    fclose(out);
	    /* Erase the old gif. */
	    unlink(argv[argc-1]);
	    /* Rename the new to the old. */
	    if (rename(outFn, argv[argc-1])!=0) {
	      perror("rename");
	      exit(1);
	    }
	  }
	}
	/* Delete the image from memory. */
	if (im) {
		gdImageDestroy(im);
	}
	/* All's well that ends well. */
	return 0;
}