Mercurial > hg > aboriginal

annotate sources/toys/trximg.sh @ 1003:6d3db5bf731a

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Make the native build timeout configurable.
author Rob Landley <rob@landley.net>
date Thu, 18 Mar 2010 05:44:47 -0500
parents 128b3b0700bf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
551
0b270ad76c8e Shell script to create linksys firmware images. (Not tested yet.)
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1 #!/bin/bash
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2
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3 # Create a TRX image from up to three source files (kernel, initramfs, rootfs),
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4 # and output it to stdout. (This is the format you flash linksys routers with.)
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5
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6 # The TRX format is a simple (28 byte) header followed by the concatenation of
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7 # the files with each file zero padded to a multiple of 4 bytes, and then the
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8 # file as a whole padded up to 4k. Padding is done with zero bytes.
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9
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10 # The tricky part is calculating the lengths and CRC for the header before
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11 # outputting the header, without screwing up the ability to pipe the output
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12 # somewhere.
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13
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14 if [ ! -f "$1" ] ||
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15 ( [ ! -z "$2" ] && [ ! -f "$2" ] ) ||
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16 ( [ ! -z "$3" ] && [ ! -f "$3" ] )
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17 then
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18 echo "Usage: trximg.sh file1 [file2 [file3]]" >&2
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19 exit 1
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20 fi
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21
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22 # Output $1 bytes of decimal number $2 as little endian binary data
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23
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24 function leout()
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25 {
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26 X=0
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27 DATA=$2
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28
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29 # Loop through bytes, smallest first
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30
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31 while [ $X -lt $1 ]
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32 do
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33 # Grab next byte
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34
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35 BYTE=$[$DATA%256]
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36 DATA=$[$DATA/256]
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37
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38 # Convert to octal (because that's what echo needs)
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39
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40 OCTAL=""
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41 for i in 1 2 3
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42 do
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43 OCTAL=$[$BYTE%8]"$OCTAL"
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44 BYTE=$[$BYTE/8]
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45 done
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46
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47 # Emit byte and loop
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48
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49 echo -ne "\0$OCTAL"
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50
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51 X=$[$X+1]
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52 BYTE=$x
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53 done
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54 }
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55
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56 # Print number of bytes required to round $2 up to a multiple of $1
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57
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58 function padlen()
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59 {
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60 echo $[($1-($2%$1))%$1]
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61 }
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62
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63 # Print number $2 rounded up to $1
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64
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65 function roundlen()
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66 {
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67 echo $[$2+$(padlen $1 $2)]
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68 }
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69
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70 # Return length of file $1 in bytes
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71
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72 function filelen()
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73 {
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74 wc -c "$1" | awk '{print $1}'
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75 }
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76
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77 # Output $1 zero bytes
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78
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79 function zpad()
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80 {
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81 [ $1 -ne 0 ] && dd if=/dev/zero bs=$1 count=1 2>/dev/null
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82 }
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83
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84 # Output file $2, followed by enough zero bytes to pad length up to $1 bytes
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85
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86 function zpad_file()
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87 {
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88 [ -z "$2" ] && return
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89 cat $2
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90 zpad $(padlen $1 $(filelen "$2"))
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91 }
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92
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93 # Output header. (Optionally just the part included in the CRC32).
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94
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95 function emit_header
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96 {
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97 if [ -z "$1" ]
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98 then
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99 echo -n "HDR0" # File ID magic
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100 leout 4 $LENGTH # Length of file (including this header)
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101 leout 4 $CRC32 # crc32 of all file data after this crc field
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102 fi
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103
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104 leout 2 0 # flags
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105 leout 2 1 # version
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106 leout 4 28 # Start of first file
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107 leout 4 $OFFSET2 # Start of second file
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108 leout 4 $OFFSET3 # Start of third file
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109 }
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110
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111 # Calculate file offsets for the three arguments
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112
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113 TOTAL=$[28+$(roundlen 4 $(filelen "$1"))]
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114 if [ -z "$2" ]
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115 then
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116 OFFSET2=0
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117 else
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118 OFFSET2=$TOTAL
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119 TOTAL=$[$TOTAL+$(roundlen 4 $(filelen "$2"))]
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120 fi
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121 if [ -z "$3" ]
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122 then
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123 OFFSET3=0
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124 else
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125 OFFSET3=$TOTAL
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126 TOTAL=$[$TOTAL+$(roundlen 4 $(filelen "$3"))]
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127 fi
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128 LENGTH=$(roundlen 4096 $TOTAL)
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129
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130 # Calculate the CRC value for the header
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131
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132 CRC32=$(
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133 (
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134 emit_header skip
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135 zpad_file 4 "$1"
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136 zpad_file 4 "$2"
569
128b3b0700bf Re-added the padding to the CRC32 section, and added flags for the toybox cksum to compute the IEEE 802.3 little-endian pre-inversion no post-inversion no-length cksum.
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137 zpad_file 4 "$3"
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138 zpad $(padlen 4096 $TOTAL)
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139 ) | cksum -NILP
551
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140 )
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141
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142 # Output the image to stdout
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143
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144 emit_header
0b270ad76c8e Shell script to create linksys firmware images. (Not tested yet.)
Rob Landley <rob@landley.net>
parents:
diff changeset
145 zpad_file 4 "$1"
0b270ad76c8e Shell script to create linksys firmware images. (Not tested yet.)
Rob Landley <rob@landley.net>
parents:
diff changeset
146 zpad_file 4 "$2"
0b270ad76c8e Shell script to create linksys firmware images. (Not tested yet.)
Rob Landley <rob@landley.net>
parents:
diff changeset
147 zpad_file 4 "$3"
0b270ad76c8e Shell script to create linksys firmware images. (Not tested yet.)
Rob Landley <rob@landley.net>
parents:
diff changeset
148 zpad $(padlen 4096 $TOTAL)