57 lines
1010 B
C
57 lines
1010 B
C
#include <stdio.h>
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#include <string.h>
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#define CHUNK_SIZE 1024
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int main(int argc, char * argv[]) {
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if (argc < 3) {
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fprintf(stderr, "Need two files to compare.\n");
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return 1;
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}
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FILE * a = fopen(argv[1], "r");
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FILE * b = fopen(argv[2], "r");
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size_t lengtha, lengthb;
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fseek(a, 0, SEEK_END);
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lengtha = ftell(a);
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fseek(a, 0, SEEK_SET);
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fseek(b, 0, SEEK_END);
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lengthb = ftell(b);
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fseek(b, 0, SEEK_SET);
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fprintf(stderr,"[%d bytes and %d bytes]\n", lengtha, lengthb);
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char bufa[CHUNK_SIZE];
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char bufb[CHUNK_SIZE];
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int chunk = 0;
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size_t read = 0;
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while (read < lengtha) {
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memset(bufa, 0x0, CHUNK_SIZE);
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memset(bufb, 0x0, CHUNK_SIZE);
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fread(bufa, 1, CHUNK_SIZE, a);
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fread(bufb, 1, CHUNK_SIZE, b);
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size_t different = 0;
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for (int i = 0; i < CHUNK_SIZE; ++i) {
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if (bufa[i] != bufb[i])
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different++;
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}
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if (different > 0) {
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printf("Chunk %d has %d differing bytes.\n", chunk, different);
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}
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read += CHUNK_SIZE;
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chunk++;
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}
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fclose(a);
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fclose(b);
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return 0;
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}
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