shell script get subtitle from shooter.cn

fetchsub.sh

#!/bin/sh
# Author: RA <ravageralpha@gmail.com>

USAGE(){
	echo "Usage:fetchsub [eng] file"
}

[ $# -eq 0 -o "$1" = '--help' ] && USAGE && exit 0

ERROR(){
	echo "Error:$@" >&2
	exit 1
}

[ -z `which openssl` ] || MD5='openssl md5'
[ -z `which md5` ] || MD5='md5'
[ -z `which md5sum` ] || MD5='md5sum'
[ -z "$MD5" ] && ERROR "No MD5 tools"
[ -z `which curl` ] && ERROR "No curl"
[ -z `which dd` ] && ERROR "No dd :)"
[ -z `which hexdump` ] && ERROR "No hexdump tools"
[ -z `which gunzip` ] && ERROR "No gunzip tools"

USERAGENT="SPlayer Build 1543"
LANGUAGE='chn'
TIMEOUT=5
CRAP="blueray|bluray|blu\-ray|remux|dvdrip|xvid|cd[0-9]|dts|vc1|vc\-1|hdtv|1080p|720p|1080i|x264|limited|ac3|hddvd|repack|@|dts\-hd"
CRAP_MISC="\[|\]|\.|\-|\#|\_|\=|\+|\<|\>|\,"

case `uname` in
	'Linux')
		SED_OPTS='-r -e';;
	'Darwin')
		# Mac Default , if you using GNU sed,edit it
		SED_OPTS='-E -e';;
	*)
		ERROR "unknown OS";;
esac

getFileSize(){
	# Fix Me
	ls -nl "$1" | awk '{print $5}'
}

getFileHash(){
	dd if="$file" bs=1 count=4096 skip=$1 2> /dev/null | $MD5 | head -c32
}

stripFileName(){
	echo -e "$(sed $SED_OPTS "s/"$CRAP"//g" -e "s/"$CRAP_MISC"/ /g")"
}

if [ "$1" != 'eng' ]; then
	file="$1"
else
	LANGUAGE='eng'
	file="$2"
fi

[ ! -f "$file" ] && ERROR "Not a File"

filesize=$(getFileSize "$file")

[ $filesize -le 8192 ] && ERROR "Serious?"

filepath="E:\\$(dirname "$file" | sed 's/\//\\\\/g')" # it's just work
filename="$(echo "$(dirname "$file")/$(basename "$file")" | sed 's/\.[^\.]*$//')"
moviename="$(basename "$filename" | tr [A-Z] [a-z] | stripFileName | xargs)"

bin="${filename}.bin"

first=4096
second=$(($filesize/3*2))
third=$(($filesize/3))
fourth=$(($filesize-8192))

filehash="$(getFileHash $first);$(getFileHash $second);$(getFileHash $third);$(getFileHash $fourth)"

for i in $(seq 9)
do
	SERVER="http://splayer$i.shooter.cn/api/subapi.php"

	echo -n "Sending request to $SERVER ..."
	
	#send request
	curl -s --connect-timeout $TIMEOUT -A "$USERAGENT" \
	-F "pathinfo=$filepath" -F "filehash=$filehash" -F "shortname=$moviename" -F "lang=$LANGUAGE" \
	-o "$bin" "$SERVER"

	if [ $? -eq 0 ]; then
		echo -n -e "OK, Extracting\n"
	else
		echo -n -e "Fail, Switching\n" >&2
		continue
	fi

	# sometimes shooter.cn give zero fuck about your request , so try other
	if [ $(getFileSize "$bin") -le 1024 ]; then
		echo "Bad response from $SERVER, Retry" >&2
		rm "$bin"
		continue
	else
		# get the subtitle filetype
		extname=`dd if="$bin" bs=1 count=7 skip=18 2> /dev/null | sed 's/^.*\(...\)/\1/'`
		sub="$filename.$extname"

		# get the subtitle
		dd if="$bin" of="$sub" bs=1 skip=29 2> /dev/null
		rm "$bin"

		# maybe not handle well , fix me
		gzip=`dd if="$sub" bs=1 count=2 2> /dev/null | hexdump -x | awk '{print $2}'`
		[ "$gzip" = '1f8b' ] && {
			echo "Got gzip here , unzipping ..."
			mv "$sub" "${sub}.tgz"
			gunzip -c "${sub}.tgz" > "$sub"
			rm "${sub}.tgz"
		}
		echo "Got it!"
		exit 0
	fi
done

ERROR "Cannot find the matching subtitle, Sorry!"

检测 gzip 格式的部分好像不太好用，如果用 file 命令来检查字幕文件是不是 gzip 压缩的，会不会更好些？