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dont use that silly buffer

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This commit is contained in:
mrdudz 2015-11-29 21:15:10 +01:00
parent b39a8b7a61
commit 4d1dc55138
1 changed files with 23 additions and 15 deletions
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38
util/gamate/gamate-fixcart.c
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@ -2,28 +2,36 @@
#include <stdlib.h>
#include <stdio.h>
unsigned char buffer[512 * 1024];
unsigned len;
FILE *in, *out;
int n, i;
FILE *in;
unsigned int n, i, c;
void usage(char *arg)
{
printf("usage: %s [file]\n", arg);
exit(-1);
}
int main(int argc, char *argv[]) {
if (argc < 3) {
if (argc < 2) {
usage(argv[0]);
exit(-1);
}
in = fopen(argv[1], "rb");
out = fopen(argv[2], "wb");
if (!in || !out) {
if (!(in = fopen(argv[1], "r+b"))) {
fprintf(stderr, "couldnt open: '%s'\n", argv[1]);
exit(-1);
}
len = fread(buffer, 1, 512 * 1024, in);
n = 0; for (i = 0x1000; i < 0x2000; i++) {
n += buffer[i];
/* read 0x1000 bytes from 0x7000-0x7fff (offset 0x1000) */
fseek(in, 0x1000, SEEK_SET);
n = 0; for (i = 0; i < 0x1000; i++) {
c = fgetc(in);
n += c;
}
buffer[0] = n & 0xff;
buffer[1] = (n >> 8) & 0xff;
fwrite(buffer, 1, len, out);
/* write checksum to header */
fseek(in, 0, SEEK_SET);
fputc(n & 0xff, in);
fputc((n >> 8) & 0xff, in);
fclose(in);
fclose(out);
return (0);
}