010 editor template for U-Boot images that i hacked up

uboot-image.bt

//
// quick 010 Editor template for u-boot images
// darell tan 2018.12.08
//

enum <uchar> IH_TYPES { 
    TYPE_INVALID, 
    TYPE_STANDALONE, 
    TYPE_KERNEL, 
    TYPE_RAMDISK, 
    TYPE_MULTI, 
    TYPE_FIRMWARE, 
    TYPE_SCRIPT, 
    TYPE_FILESYSTEM, 
    TYPE_FLATDT, 
    TYPE_KWBIMAGE, 
    TYPE_IMXIMAGE,
};

enum <uchar> IH_ARCHS {
    ARCH_INVALID,
    ARCH_ALPHA,
    ARCH_ARM,
    ARCH_I386,
    ARCH_IA64,
    ARCH_MIPS,
    ARCH_MIPS64,
    ARCH_PPC,
    ARCH_S390,
    ARCH_SH,
    ARCH_SPARC,
    ARCH_SPARC64,
    ARCH_M68K,
    ARCH_NIOS,
    ARCH_MICROBLAZE,
    ARCH_NIOS2,
    ARCH_BLACKFIN,
    ARCH_AVR32,
    ARCH_ST200,
};

enum <uchar> IH_OSES {
    OS_INVALID,
    OS_OPENBSD,
    OS_NETBSD,
    OS_FREEBSD,
    OS_4_4BSD,
    OS_LINUX,
    OS_SVR4,
    OS_ESIX,
    OS_SOLARIS,
    OS_IRIX,
    OS_SCO,
    OS_DELL,
    OS_NCR,
    OS_LYNXOS,
    OS_VXWORKS,
    OS_PSOS,
    OS_QNX,
    OS_U_BOOT,
    OS_RTEMS,
    OS_ARTOS,
    OS_UNITY,
    OS_INTEGRITY,
};

enum <uchar> IH_COMPS {
    COMP_NONE,
    COMP_GZIP,
    COMP_BZIP2,
    COMP_LZMA,
    COMP_LZO,
};

typedef struct image_header {
    uint32    ih_magic <format=hex>;   /* Image Header Magic Number */
    uint32    ih_hcrc  <format=hex>;   /* Image Header CRC Checksum */
    uint32    ih_time  <format=hex>;   /* Image Creation Timestamp  */
    uint32    ih_size;                 /* Image Data Size           */
    uint32    ih_load  <format=hex>;   /* Data     Load  Address    */
    uint32    ih_ep    <format=hex>;   /* Entry Point Address       */
    uint32    ih_dcrc  <format=hex>;   /* Image Data CRC Checksum   */
    enum IH_OSES  ih_os;            /* Operating System          */
    enum IH_ARCHS ih_arch;          /* CPU architecture          */
    enum IH_TYPES ih_type;          /* Image Type                */
    enum IH_COMPS ih_comp;          /* Compression Type          */
    char      ih_name[32];    /* Image Name            */

    byte      img_data[ih_size];
} image_header_t;

// XXX are the images of a fixed endian format?
#define IH_MAGIC 0x27051956
if (ReadUInt() != IH_MAGIC) {
    // try flipping endian and try again
    if (IsBigEndian()) LittleEndian();
    else BigEndian();

    if (ReadUInt() != IH_MAGIC) {
        Warning("can't find header magic");
        return -1;
    }
}

local int64 pos = -1;
while (!FEof() && FTell() > pos) {
    pos = FTell();
    image_header_t img;

    // seek back into the prev image data
    //FSeek(sizeof(img) - img.ih_size);
}