Extract .ico images from .ani animated cursors - ani2ico

TeoBigusDickus · 2012-10-21 17:21:49

Something I'd like to share with you guys...

I've found a Windows cursor theme that I liked and decided to port it to linux.
The .cur (or .ico) files are no issue, as they can be opened by gimp or inkscape and further processed.
The problem is with the .ani files - animated cursors. I've found no native linux app that can extract the packed .ico files inside them, so I can create an X11 animated cursor in gimp.
Therefore, I've written the following piece of code in C that does exactly that: accepts an .ani file as an argument and extracts its .ico files .

/* ani2ico: program created by TeoBigusGeekus - October 2012 *
 * Extract .ico images from .ani animated Windows cursors.   */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void ReadFile(char *name);
int test_for_icon_string(char *buffer,int start);

int main(int argc, char **argv)
{
    if (argc != 2) {
		fprintf(stderr, "Please give an .ani filename as an argument.\n");
        return 0;
    }

	ReadFile(*(argv+1));
	return 0;
}

int test_for_icon_string(char *buffer,int start)
{
    if (*(buffer+start) == 0x69) {
        if (*(buffer+start+1) == 0x63) {
            if (*(buffer+start+2) == 0x6f) {
                if (*(buffer+start+3) == 0x6e) {
                    return 1;
                }
            }
        }
    } else return 0;
}

void ReadFile(char *name)
{
	FILE *file;
	char *buffer,*fileName;
	unsigned long fileLen;

    if (!strstr(name,".ani")) {
		fprintf(stderr, "Please give an .ani filename as an argument.\n");
        return;
    }

    fileName=malloc(strlen(name)+1);
    if (!fileName) {
		fprintf(stderr, "Memory error!\n");
        return;
    }

    strcpy(fileName,name);
    *strstr(fileName,".ani")='\0';

	file = fopen(name, "rb");
	if (!file) {
		fprintf(stderr, "Unable to open file %s.\n", name);
        free(fileName);
		return;
	}
	
	fseek(file, 0, SEEK_END);
	fileLen=ftell(file);
	fseek(file, 0, SEEK_SET);

	buffer=(char *)malloc(fileLen+1);
	if (!buffer) {
		fprintf(stderr, "Memory error!\n");
        fclose(file);
        free(fileName);
		return;
	}

	fread(buffer, fileLen, 1, file);
	fclose(file);

    char *new_ico_name=malloc(strlen(name)+5);
    if (!new_ico_name) {
		fprintf(stderr, "Memory error!\n");
        free(fileName);
        free(buffer);
        return;
    }

    char ico_counter_string[5];
	int i,j,ico_counter=1;
    FILE *ico_image;

	for (i=0;i <= fileLen;i++) {
        if (ico_counter == 9999) {
			free(fileName);
			free(buffer);
			free(new_ico_name);
            return;
		}
		
        if ((i+4 <= fileLen) && test_for_icon_string(buffer,i) == 1) {
            sprintf(ico_counter_string,"%d",ico_counter);
            strcpy(new_ico_name,fileName);
            strcat(new_ico_name,ico_counter_string);
            strcat(new_ico_name,".ico");
            ico_counter++;

            ico_image = fopen(new_ico_name,"wb");
            if (!ico_image) {
                fprintf(stderr, "Unable to open file %s.\n", new_ico_name);
                free(fileName);
                free(buffer);
                free(new_ico_name);
                return;
            }

            j=8;
            while (i+j+4 <= fileLen) {
                if (test_for_icon_string(buffer,i+j+1) == 1)
                    break;
                if (j==10)
                    putc(0x01,ico_image);
                else
                    putc(*(buffer+i+j),ico_image);
                j++;
            }
            if (i+j <= fileLen)
                putc(*(buffer+i+j),ico_image);
            if (fileLen-i-j<=3) {
                putc(*(buffer+i+j+1),ico_image);
                putc(*(buffer+i+j+2),ico_image);
            }
            fclose(ico_image);
            i+=j;
        }
    }
        
    free(new_ico_name);
    free(buffer);
    free(fileName);
}

Save as ani2ico.c and compile with

gcc ani2ico.c -o ani2ico

Use the executable as

/path/ani2ico /path/filename.ani

The program will create .ico files starting with filename1.ico, up to the last .ico file contained in the .ani animation.

I've tested it with a dozen .ani files and it works as expected; any feedback though would be welcome.

Have fun converting windows cursors and thanks for your attention.

Last edited by TeoBigusDickus (2012-10-22 12:17:52)

TeoBigusDickus · 2012-10-22 12:18:33

A couple of bugs corrected. Thanks to mlq.

Arch Linux

#1 2012-10-21 17:21:49

Extract .ico images from .ani animated cursors - ani2ico

#2 2012-10-22 12:18:33

Re: Extract .ico images from .ani animated cursors - ani2ico

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