72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
// this program is in the public domain
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// written by Folkert van Heusden <mail@vanheusden.com>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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void put_byte(const uint8_t byte, int32_t *const csum, FILE *const fh)
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{
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*csum -= byte;
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fputc(byte, fh);
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}
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int main(int argc, char *argv[])
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{
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if (argc != 5) {
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fprintf(stderr, "Usage: %s file_in load_offset start_offset file_out\n", argv[0]);
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fprintf(stderr, "Note: offsets must be decimal\n");
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return 1;
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}
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const char *file_in = argv[1];
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const uint32_t offset = atol(argv[2]);
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const uint32_t start = atol(argv[3]);
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const char *file_out = argv[4];
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FILE *fh_in = fopen(file_in, "r");
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FILE *fh_out = fopen(file_out, "wb");
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fseek(fh_in, 0, SEEK_END);
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uint32_t file_size = ftell(fh_in);
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fseek(fh_in, 0, SEEK_SET);
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int32_t csum = 0;
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// header for the data itself
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// after the data, a header will follow setting
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// the start address
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put_byte(0x01, &csum, fh_out);
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put_byte(0x00, &csum, fh_out);
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uint32_t temp = file_size + 6;
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put_byte(temp & 255, &csum, fh_out);
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put_byte(temp >> 8, &csum, fh_out);
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put_byte(offset & 255, &csum, fh_out);
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put_byte(offset >> 8, &csum, fh_out);
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for(int i=0; i<file_size; i++) {
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uint8_t c = fgetc(fh_in);
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put_byte(c, &csum, fh_out);
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}
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fputc(csum & 0xff, fh_out);
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put_byte(0x01, &csum, fh_out);
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put_byte(0x00, &csum, fh_out);
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put_byte(6, &csum, fh_out);
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put_byte(0, &csum, fh_out);
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put_byte(start & 255, &csum, fh_out);
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put_byte(start >> 8, &csum, fh_out);
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fclose(fh_out);
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fclose(fh_in);
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return 0;
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}
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