39 lines
744 B
Bash
Executable file
39 lines
744 B
Bash
Executable file
#!/bin/bash
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getbyte () {
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local IFS= LC_CTYPE=C res c
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read -r -n 1 -d '' c
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res=$?
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# the single quote in the argument of the printf
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# yields the numeric value of $c (ASCII since LC_CTYPE=C)
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[[ -n $c ]] && c=$(printf '%u' "'$c") || c=0
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printf "$c"
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return $res
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}
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getword () {
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local b1 b2 val
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b1=$(getbyte) || return 1
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b2=$(getbyte) || return 1
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(( val = b2 * 256 + b1 ))
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echo $val
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return 0
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}
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getuint () {
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local b1 b2 val
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b1=$(getword) || return 1
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b2=$(getword) || return 1
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(( val = b2 * 256 * 256 + b1 ))
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echo $val
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return 0
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}
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squashfs_size() {
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size=$(for i in {1..20}; do getword >/dev/null; done; getuint)
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echo $(((size+4095)/4096*4096))
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}
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squashfs_size
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