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