46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
#include "decode.h"
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#include <stdio.h>
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#include <stdint.h>
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int decode_main(int argc, char* argv[])
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{
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FILE *input_file = fopen(argv[2], "rb");
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if (!input_file) {
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fprintf(stderr, "Error opening input file: %s\n", argv[2]);
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return 1;
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}
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FILE *output_file = fopen(argv[3], "wb");
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if (!output_file) {
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fprintf(stderr, "Error opening output file: %s\n", argv[3]);
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fclose(input_file);
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return 1;
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}
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uint8_t buffer[2048], decoded[1024];
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size_t bytes_read;
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// // b_r
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while ((bytes_read = fread(buffer, 1, sizeof(buffer), input_file)) > 0) {
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if (bytes_read % 2 != 0) { //odd check
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size_t extra = fread(buffer + bytes_read, 1, 1, input_file);
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if (extra == 1) { // successfully read
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bytes_read++;
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} else { // error reading the extra byte
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fclose(input_file);
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fclose(output_file);
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return 1;
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}
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}
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size_t decoded_size = bytes_read / 2;
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for (size_t i = 0; i < decoded_size; i++) {
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decoded[i] = decode_combine_nibbles(buffer[i], buffer[i + decoded_size]);
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}
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fwrite(decoded, 1, decoded_size, output_file);
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}
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fclose(input_file);
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fclose(output_file);
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printf("Decoding completed successfully.\n");
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return 0;
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}
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