PKG/CNT

/*
*   PS4 PKG CNT header parser
*       by Reisyukaku
*/

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <malloc.h>

typedef uint16_t u16;
typedef uint32_t u32;

typedef struct{
    u32 magic;
    u32 dummy1;
    u32 dummy2;
    u32 dummy3;
    u32 files;
    u16 dummy4;
    u16 dummy5;
    u32 infoOffset;
    u32 dummy7;
    u32 dummy8;
    u32 dummy9;
    u32 dummy10;
    u32 infoEnd;
} header;

unsigned endianFlip(int i){
    return ((i >> 24) & 0xFF) | ((i << 8) & 0xFF0000) | ((i >> 8) & 0xFF00) | ((i << 24) & 0xFF000000);
}

int main(int argc, char **argv){
    if(argc < 2){
        printf("Invalid args!\nUsage: %s <file>\n", argv[0]);
        return 1;
    }

    FILE *fp;
    header *hdr = NULL;
    unsigned char *blob = NULL;
    fp = fopen(argv[1], "rb");
    if(!fp){
        printf("File not found!\n");
        return 1;
    }
    blob = (unsigned char*)malloc(0x100);
    fread(blob, 1, 0x100, fp);
    hdr = (header*)blob;
    if (hdr->magic == 0x544E437F){ //\x7FCNT
        printf("CNT header\n"
               "-----------\n"
               "Files: %d\n"
               "Info Offset: 0x%X\n",
               endianFlip(hdr->files),
               endianFlip(hdr->infoOffset)
        );
    }else{
        printf("Unknown file type!\n");
        return 1;
    }

    fclose(fp);
    free(blob);

    return 0;
}