#!/bin/sh # # Copyright (C) 2011 OpenWrt.org # # This is free software, licensed under the GNU General Public License v2. # See /LICENSE for more information. # # Write image header followed by all specified files # The header is padded to 64k, format is: # CE magic word ("Combined Extended Image") (2 bytes) # <CE_VERSION> file format version field (2 bytes) # <TYPE> short description of the target device (32 bytes) # <NUM FILES> number of files following the header (2 byte) # <file1_name> name of the first file (32 bytes) # <file1_length> length of the first file encoded as zero padded 8 digit hex (8 bytes) # <file1_md5> md5 checksum of the first file (32 bytes) # <fileN_name> name of the Nth file (32 bytes) # <fileN_length> length of the Nth file encoded as zero padded 8 digit hex (8 bytes) # <fileN_md5> md5 checksum of the Nth file (32 bytes) ## version history # * version 1: initial file format with num files / name / length / md5 checksum ME="${0##*/}" usage() { echo "Usage: $ME <type> <ext filename> <file1> <filename1> [<file2> <filename2> <fileN> <filenameN>]" [ "$IMG_OUT" ] && rm -f "$IMG_OUT" exit 1 } [ "$#" -lt 4 ] && usage CE_VERSION=1 IMG_TYPE=$1; shift IMG_OUT=$1; shift FILE_NUM=$(($# / 2)) FILES="" printf "CE%02x%-32s%02x" $CE_VERSION "$IMG_TYPE" $FILE_NUM > $IMG_OUT while [ "$#" -gt 1 ] do file=$1 filename=$2 [ ! -f "$file" ] && echo "$ME: Not a valid file: $file" && usage FILES="$FILES $file" md5=$(cat "$file" | md5sum -) printf "%-32s%08x%32s" "$filename" $(stat -c "%s" "$file") "${md5%% *}" >> $IMG_OUT shift 2 done [ "$#" -eq 1 ] && echo "$ME: Filename not specified: $1" && usage mv $IMG_OUT $IMG_OUT.tmp dd if="$IMG_OUT.tmp" of="$IMG_OUT" bs=65536 conv=sync 2>/dev/null rm $IMG_OUT.tmp cat $FILES >> $IMG_OUT