66 lines
1.6 KiB
Bash
66 lines
1.6 KiB
Bash
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#!/bin/sh
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set -f
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COMPRESS_MIN_RATIO=90
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if command -V gzip >/dev/null ; then has_gzip=1 ; fi
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if command -V brotli >/dev/null ; then has_brotli=1 ; fi
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if command -V zstd >/dev/null ; then has_zstd=1 ; fi
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do_gzip() { [ -s "$1.gz" ] || gzip -1kf "$1" ; comp_fixup "$1" "$1.gz" ; }
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do_brotli() { [ -s "$1.br" ] || brotli -1kf "$1" ; comp_fixup "$1" "$1.br" ; }
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do_zstd() { [ -s "$1.zst" ] || zstd -q1kf "$1" ; comp_fixup "$1" "$1.zst" ; }
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comp_fixup() {
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size1=$(env stat -c '%s' "$1") || return
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[ -f "$2" ] || return
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[ -s "$2" ] || { rm -f "$2" ; return ; }
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size2=$(env stat -c '%s' "$2") || return
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pow1=${#size1} ; pow2=${#size2}
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## if size2 is _longer_ than size1 - compression did something wrong (file is bigger)
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if [ ${pow2} -gt ${pow1} ] ; then
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rm -f "$2" ; return
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fi
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## if size1 is _longer_ size2 more than 2 digits - compression was done very successful
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## doubtful but okay (c) Oleg Tinkov
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if [ $(( pow1 - pow2 )) -gt 2 ] ; then
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return
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fi
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## math hack!
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if [ ${pow1} -gt 7 ] ; then
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skew=$(( pow1 - 4 ))
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pow1=$(( pow1 - skew ))
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pow2=$(( pow2 - skew ))
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size1=$(printf '%s' "${size1}" | cut -c 1-${pow1})
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size2=$(printf '%s' "${size2}" | cut -c 1-${pow2})
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fi
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ratio=$(( (100 * size2) / size1 ))
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if [ ${ratio} -ge ${COMPRESS_MIN_RATIO} ] ; then
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rm -f "$2"
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else
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## seems to be excessive
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: touch -r "$1" -m "$2"
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fi
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}
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for i ; do
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[ -n "$i" ] || continue
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case "$i" in
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*.br | *.gz | *.zst ) continue ;;
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esac
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[ -f "$i" ] || continue
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[ -s "$i" ] || continue
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[ -z "${has_gzip}" ] || do_gzip "$i"
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[ -z "${has_brotli}" ] || do_brotli "$i"
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[ -z "${has_zstd}" ] || do_zstd "$i"
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done
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