mtkinfo.c

不知如何使用,哪个会用的指教一下,谢谢QQ547873739

/*  mtkinfo, 6/sep/03
    (c)copyright 2003, av_pete
    a tool to gather the locations of known data within mt1369 firmware.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

/* bootstrap code seems to always begin with the following instructions */
static const unsigned int bootstrap_magic[] = {
    0xea00000e,     /* b +0x40 */
    0xea00000d,     /* b +0x3c */
    0xea00000c,     /* b +0x38 */
    0xea00000b,     /* b +0x34 */
    0xea00000a,     /* b +0x30 */
};

static const unsigned char mtkosd_magic[] = "MTKOSD 0.1";


static const unsigned char mpeg2_start_magic[] = {
    0x00, 0x00, 0x01, 0xb3
};

static const unsigned char mpeg2_user_magic[] = {
    0x00, 0x00, 0x01, 0xb2
};

static const unsigned char mpeg2_stop_magic[] = {
    0x00, 0x00, 0x01, 0xb7
};


int main(int argc, char **argv)
{
    FILE *f;
    unsigned char * buf;
    unsigned int length;
    unsigned int i, j;
    unsigned int within_mpeg2;

    if (argc!=2) {
        printf("%s filename.bin\n", argv[0]);
        return EXIT_FAILURE;
    }
    f = fopen(argv[1], "rb");
    if (f==NULL) {
        printf("fopen %s failed\n", argv[1]);
        return EXIT_FAILURE;
    }

    fseek(f, 0, SEEK_END);
    length = ftell(f);
    fseek(f, 0, SEEK_SET);

    buf = malloc(length);
    if (buf==NULL) {
        printf("fopen %s failed\n", argv[1]);
        return EXIT_FAILURE;
    }

    fread(buf, length, 1, f);
    fclose(f);

    within_mpeg2 = 0;
    for(i=0; i< length - sizeof(bootstrap_magic); i++) {

        if (i%4==0 && memcmp(buf + i, bootstrap_magic, sizeof(bootstrap_magic))==0) {
            unsigned int * tmp = (unsigned int*)(buf+i);
            printf("0x%x\tbootstrap\n", i);

            /* the 12th bootstrap words seems to indicate the number of compressed blocks.
               this is followed by the compressed block offets, relative to the bootstrap */
            for(j=0; j<tmp[12]; j++) {
              printf("0x%x\tcompressed #%i\n", i + tmp[12+j+1], j+1);
            }

            /* the 11th bootstrap word indicates an offset to some unknown table, relative
               to the bootstrap */
            printf("0x%x\tunknown table\n", i + tmp[11]);
        }else if (i%4==0 && memcmp(buf + i, mtkosd_magic, sizeof(mtkosd_magic))==0) {
            /* generally there are two mtkosd blocks, which contain on-screen-display data
               the first contains font/bitmap data, the second contains menu strings */
            printf("0x%x\tmtkosd\n", i);
        }else if (i%4==0 && memcmp(buf + i, mpeg2_start_magic, sizeof(mpeg2_start_magic))==0) {
            /* mpeg2 start code */
            printf("0x%x\tmpeg2_start\n", i);
            within_mpeg2 = 1;
        }else if (within_mpeg2 && memcmp(buf + i, mpeg2_user_magic, sizeof(mpeg2_user_magic))==0) {
            /* mpeg2 user data code. often indicates the encoding application used */
            printf("0x%x\tmpeg2_user \"", i);
            i+=4;
            while(buf[i+0]!=0x00 || buf[i+1]!=0x00 || buf[i+2]!=0x01) {
                printf("%c", buf[i]);
                i++;
            }
            printf("\"\n");
        }else if (within_mpeg2 && memcmp(buf + i, mpeg2_stop_magic, sizeof(mpeg2_stop_magic))==0) {
            /* mpeg2 stop code */
            printf("0x%x\tmpeg2_stop\n", i);
            within_mpeg2 = 0;
        }
    }

    free(buf);

    return EXIT_SUCCESS;
}