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127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
/* J J Larworthy 27 September 2006 */
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/* file to read the boot sector of a dis and the loaded image and report
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* if the boot rom would accept the data as intact and suitable for use
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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extern uint32_t crc32(uint32_t, const unsigned char *, unsigned int);
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#define NUMBER_VECTORS 12
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struct {
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unsigned int start_vector[NUMBER_VECTORS];
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char code[4];
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unsigned int header_length;
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unsigned int reserved[3];
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unsigned int length;
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unsigned int img_CRC;
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unsigned int CRC;
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} img_header;
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void print_usage(void)
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{
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printf("update_header file.bin\n");
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}
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void print_header(void)
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{
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int i;
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printf("vectors in header\n");
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for (i = 0; i < NUMBER_VECTORS; i++) {
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printf("%d:0x%08x\n", i, img_header.start_vector[i]);
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}
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printf("length:%8x\nimg_CRC:0x%08x\nHeader CRC:0x%08x\n",
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img_header.length, img_header.img_CRC, img_header.CRC);
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}
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int main(int argc, char **argv)
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{
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int in_file;
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int status;
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int unsigned crc;
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int file_length;
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int len;
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struct stat file_stat;
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void *executable;
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in_file = open(argv[1], O_RDWR);
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if (in_file < 0) {
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printf("failed to open file:%s\n", argv[optind]);
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return -ENOENT;
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}
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status = fstat(in_file, &file_stat);
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/* read header and obtain size of image */
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status = read(in_file, &img_header, sizeof(img_header));
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file_length = file_stat.st_size - sizeof(img_header);
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if (img_header.length != file_length) {
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printf("size in header:%d, size of file: %d\n",
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img_header.length, file_length);
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}
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img_header.length = file_length;
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/* read working image and CRC */
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executable = malloc(file_length);
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status = read(in_file, executable, file_length);
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if (status != file_length) {
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printf("Failed to load image\n");
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free(executable);
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return -ENOENT;
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}
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/* verify image CRC */
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crc = crc32(0, (const unsigned char *) executable, img_header.length);
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if (crc != img_header.img_CRC) {
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printf("New Image CRC:0x%08x, hdr:0x%08x\n", crc,
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img_header.img_CRC);
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img_header.img_CRC = crc;
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}
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memcpy(img_header.code, "BOOT", 4);
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img_header.header_length = sizeof(img_header);
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/* check header CRC */
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crc = crc32(0, (const unsigned char *) &img_header,
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sizeof(img_header) - sizeof(unsigned int));
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if (crc != img_header.CRC) {
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printf("New header CRC - crc:0x%08x hdr:0x%08x\n", crc,
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img_header.CRC);
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img_header.CRC = crc;
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}
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/* re-write the file */
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status = lseek(in_file, 0, SEEK_SET);
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if (status != 0) {
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printf("failed to rewind\n");
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free(executable);
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return 1;
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}
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len = write(in_file, &img_header, sizeof(img_header));
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assert(len == sizeof(img_header));
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len = write(in_file, executable, file_length);
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assert(len == file_length);
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close(in_file);
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free(executable);
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return 0;
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}
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