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