mirror of
https://github.com/raphnet/gc_n64_usb-v3
synced 2024-12-22 15:28:52 -05:00
144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "hexdump.h"
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static unsigned char chk(unsigned char *buf, int len)
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{
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int i;
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unsigned char r = 0;
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for (i=0; i<len; i++) {
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r += buf[i];
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}
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return r;
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}
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/* \return The highest address written to, or negative on errors.
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*/
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int load_ihex(const char *file, unsigned char *dstbuf, int bufsize)
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{
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FILE *fptr;
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char linebuf[550];
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unsigned char databuf[2+1+255+1];
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int ret = 0;
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int line = 0;
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int eof_seen = 0;
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unsigned int max_address = 0;
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unsigned int offset = 0;
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fptr = fopen(file, "r");
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if (!fptr) {
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perror("fopen");
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return -1;
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}
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do {
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if (fgets(linebuf, sizeof(linebuf), fptr)) {
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unsigned int data_count;
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unsigned int address;
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int input_nibbles, input_bytes;
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int i;
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line++;
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if (linebuf[0] != ':') {
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fprintf(stderr, "Ignored invalid line %d\n", line);
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continue;
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}
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if (eof_seen) {
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fprintf(stderr, "extra data after EOF record in hex file\n");
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ret = -7;
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goto err;
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}
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// :10 0000 00 92C064C7ABC0AAC0A9C0A8C0A7C0A6C0 00
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// ^ ^ ^ ^ ^-- Checksum
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// | | | +----- Data [data_count]
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// | | +---- Record type
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// | +------ Address
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// +----- data_count
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//
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input_nibbles = strlen(linebuf) - 1;
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for (input_bytes=0,i=0; i<input_nibbles; i+=2) {
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unsigned int byte;
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if (1 != sscanf(linebuf + 1 + i, "%02x", &byte)) {
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break;
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}
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databuf[input_bytes] = byte;
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input_bytes++;
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}
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//printf("Input bytes: %d\n", input_bytes);
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//printHexBuf(databuf, input_bytes);
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// Validate the record checksum
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if (chk(databuf, input_bytes)) {
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fprintf(stderr, "Bad checksum at line %d\n", line);
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ret = -4;
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goto err;
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}
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// Data length sanity check
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data_count = databuf[0];
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if (input_bytes != 1+2+1+data_count+1) {
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fprintf(stderr, "Invalid record (less data than expected) at line %d\n", line);
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ret = -5;
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goto err;
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}
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address = databuf[1]<<8 | databuf[2];
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switch(databuf[3])
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{
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case 0x00: // Data
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if (address + offset + data_count > bufsize) {
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fprintf(stderr, "hex file too large\n");
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ret = -6;
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goto err;
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}
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if (address + offset + data_count > max_address) {
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max_address = address + offset + data_count;
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}
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memcpy(dstbuf + address + offset, databuf + 4, data_count);
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break;
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case 0x01: // EOF
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eof_seen = 1;
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break;
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case 0x04: // Extended linear address
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if (data_count != 2) {
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fprintf(stderr, "ihex parser: Malformatted 0x04 record at line %d\n", line);
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ret = -8;
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goto err;
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}
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offset = (databuf[4] << 24) | (databuf[5] << 16);
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//printf("OFfset: 0x%08x\n", offset);
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break;
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case 0x03: // Start segment address
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case 0x05: // Start linear address
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// Ignored
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break;
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default:
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case 0x02: // Extended segment address
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fprintf(stderr, "ihex parser: Unimplemented record type 0x%02x at line %d\n", databuf[3], line);
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ret = -2;
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goto err;
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}
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}
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} while (!feof(fptr));
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fclose(fptr);
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return max_address;
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err:
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fclose(fptr);
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return ret;
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}
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