analog-utilities/tools/rlefont.c

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2023-04-12 14:43:16 +00:00
#include <stdio.h>
#include <string.h>
unsigned char buf[2048];
int getrunlength(unsigned char *buf, int index) {
int rl;
unsigned char ch = buf[index];
for(rl = 1; ((index+rl) < 2048) && (rl < 128); rl++) {
if(buf[index+rl] != ch) break;
}
return rl - 1;
}
int main(int argc, char **argv) {
int i;
FILE *in, *out;
if(argc != 3) {
fprintf(stderr, "Usage:\r\n\t%s <input> <output>\r\n", argv[0]);
return -1;
}
in = fopen(argv[1], "rb");
if(!in) {
fprintf(stderr, "Unable to open file '%s' for input.\r\n", argv[1]);
return -1;
}
out = fopen(argv[2], "wb");
if(!out) {
fprintf(stderr, "Unable to open file '%s' for output.\r\n", argv[2]);
fclose(in);
return -1;
}
fread(buf, 1, 16, in);
fwrite(buf, 1, 16, out);
fread(buf, 1, 2048, in);
while(i < 2048) {
int rl = getrunlength(buf, i);
fputc((buf[i] & 0x7F), out);
if(rl != 0) {
fputc((rl | 0x80), out);
}
i += 1 + rl;
}
fclose(in);
fclose(out);
return 0;
}