mkimage2.1

#!/bin/bash

## hyphop ##

#= mkimage wrapper
#= zero time recalc crc32

OUT=
for v in $@; do
    OUT=$v
done

echo "[i] MKIMAGE OUT: $OUT">&2

mkimage $@ || exit 1

## replace crc32 and time
dd if=/dev/zero bs=4 seek=1 count=2 conv=fsync,notrunc of=$OUT 2>/dev/null
#
#CRC=$(dd if=$OUT bs=64 count=1 2>/dev/null | gzip -c | tail -c8 | hexdump -n4 -e '"%X"')
#h1=${CRC:6:2}
#h2=${CRC:4:2}
#h3=${CRC:2:2}
#h4=${CRC:0:2}
#echo "[i] MKIMAGE CRC $CRC == $h1$h2$h3$h4">&2
#printf "%b" "\x$h4\x$h3\x$h2\x$h1" | dd bs=4 seek=1 count=1 conv=fsync,notrunc of=$OUT 2>/dev/null

dd if=$OUT bs=64 count=1 2>/dev/null | \
    gzip -1 -c | tail -c8 | head -c4 | \
    dd bs=4 seek=1 count=1 conv=fsync,notrunc of=$OUT

exit 0

#64=32+32

#typedef struct image_header {
#    uint32_t	ih_magic;	/* Image Header Magic Number	*/
#    uint32_t	ih_hcrc;	/* Image Header CRC Checksum	*/
#    uint32_t	ih_time;	/* Image Creation Timestamp	*/
#    uint32_t	ih_size;	/* Image Data Size		*/
#    uint32_t	ih_load;	/* Data	 Load  Address		*/
#    uint32_t	ih_ep;		/* Entry Point Address		*/
#    uint32_t	ih_dcrc;	/* Image Data CRC Checksum	*/
#    uint8_t		ih_os;		/* Operating System		*/
#    uint8_t		ih_arch;	/* CPU architecture		*/
#    uint8_t		ih_type;	/* Image Type			*/
#    uint8_t		ih_comp;	/* Compression Type		*/
#    uint8_t		ih_name[IH_NMLEN];	/* Image Name		*/
#} image_header_t;