48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <memory.h>
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static inline uint16_t r16(uint8_t *p) {
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uint16_t r = *p++;
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r |= *p++ << 8;
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return r;
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}
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int main(int argc, char **argv) {
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if (argc != 4) {
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fprintf(stderr, "Usage: %s <file> <start> <outfile>\n", argv[0]);
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fprintf(stderr, " start is in hex\n");
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return -1;
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}
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FILE *f = fopen(argv[1], "rb");
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if (!f) {
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fprintf(stderr, "Couldn't open %s\n", argv[1]);
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return -1;
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}
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fseek(f, 0, SEEK_END);
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int len = ftell(f);
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fseek(f, 0, SEEK_SET);
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uint8_t *data = malloc(len);
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fread(data, 1, len, f);
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fclose(f);
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uint32_t start = strtol(argv[2], NULL, 16);
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if (start > len - 4) {
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fprintf(stderr, "Start address is too large\n");
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return -1;
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}
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uint32_t blockLen = r16(data + start + 6);
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uint32_t fileLen = 600 + blockLen * 3 + 30;
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f = fopen(argv[3], "wb");
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if (!f) {
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fprintf(stderr, "Couldn't create %s\n", argv[3]);
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return -1;
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}
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fwrite(data + start, 1, fileLen, f);
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fclose(f);
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}
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