3 # Copyright (C) 2011 OpenWrt.org
5 # This is free software, licensed under the GNU General Public License v2.
6 # See /LICENSE for more information.
9 # Write image header followed by all specified files
10 # The header is padded to 64k, format is:
11 # CE magic word ("Combined Extended Image") (2 bytes)
12 # <CE_VERSION> file format version field (2 bytes)
13 # <TYPE> short description of the target device (32 bytes)
14 # <NUM FILES> number of files following the header (2 byte)
15 # <file1_name> name of the first file (32 bytes)
16 # <file1_length> length of the first file encoded as zero padded 8 digit hex (8 bytes)
17 # <file1_md5> md5 checksum of the first file (32 bytes)
18 # <fileN_name> name of the Nth file (32 bytes)
19 # <fileN_length> length of the Nth file encoded as zero padded 8 digit hex (8 bytes)
20 # <fileN_md5> md5 checksum of the Nth file (32 bytes)
23 # * version 1: initial file format with num files / name / length / md5 checksum
28 echo "Usage: $ME <type> <ext filename> <file1> <filename1> [<file2> <filename2> <fileN> <filenameN>]"
29 [ "$IMG_OUT" ] && rm -f "$IMG_OUT"
33 [ "$#" -lt 4 ] && usage
41 printf "CE%02x%-32s%02x" $CE_VERSION "$IMG_TYPE" $FILE_NUM > $IMG_OUT
48 [ ! -f "$file" ] && echo "$ME: Not a valid file: $file" && usage
50 md5=$(cat "$file" | md5sum -)
51 printf "%-32s%08x%32s" "$filename" $(stat -c "%s" "$file") "${md5%% *}" >> $IMG_OUT
55 [ "$#" -eq 1 ] && echo "$ME: Filename not specified: $1" && usage
57 mv $IMG_OUT $IMG_OUT.tmp
58 dd if="$IMG_OUT.tmp" of="$IMG_OUT" bs=65536 conv=sync 2>/dev/null
61 cat $FILES >> $IMG_OUT