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File mimecheck of Package metamail

#!/bin/bash -f

MIME="application/octet-stream"
CTYPE="[Cc]ontent-[Tt]ype:[[:blank:]]${MIME}"
CAPPD="(;[[:print:]]*(\n[[:blank:]]+[[:print:]]+)?)?\n"
CREST="([Cc]ontent-[[:print:]]+${CAPPD})*"

MATCH="${1}"
INPUT="${2}"

OUTER="^-+${MATCH}"
INNER=".*\n-+${MATCH}\n${CTYPE}${CAPPD}${CREST}\n(.*)\n-+${MATCH}-*.*"

type -p file	    &> /dev/null || { echo "${0##*/}: Missing \`file' in path" 1>&2; exit 1; }
type -p mimencode   &> /dev/null || { echo "${0##*/}: Missing \`mimencode' in path" 1>&2; exit 1; }
case "${0##*/}" in
mimezip)
    type -p funzip  &> /dev/null || { echo "${0##*/}: Missing \`funzip' in path" 1>&2; exit 1; }
    ;;
mimebzip)
    type -p bunzip2 &> /dev/null || { echo "${0##*/}: Missing \`bunzip2' in path" 1>&2; exit 1; }
    ;;
mimegzip)
    type -p gunzip &> /dev/null || { echo "${0##*/}: Missing \`gunzip' in path" 1>&2; exit 1; }
    ;;
esac

if test -z "$MATCH" ; then
    echo "${0##*/}: No boundary for mail attachment provided" 1>&2;
    exit 1;
fi
if test -n "$INPUT" ; then
    if test -r "$INPUT" ; then
	exec 0< "$INPUT"
    elif test "$INPUT" != "-" ; then
	echo "${0##*/}: No such file \`$INPUT'" 1>&2;
	exit 1;
    fi
fi

exec 3> >(exec -a file file -bin - 2>/dev/null)
case "${0##*/}" in
mimezip)
    exec 4> >(exec -a funzip funzip 2>/dev/null 1>&3)
    exec 5> >(exec -a mimencode mimencode -u 1>&4)
    ;;
mimebzip)
    exec 4> >(exec -a bunzip2 bunzip2 -f 2>/dev/null 1>&3)
    exec 5> >(exec -a mimencode mimencode -u 1>&4)
    ;;
mimegzip)
    exec 4> >(exec -a gunzip gunzip -f 2>/dev/null 1>&3)
    exec 5> >(exec -a mimencode mimencode -u 1>&4)
    ;;
*)
    exec 5> >(exec -a mimencode mimencode -u 1>&3)
    ;;
esac
exec -a sed sed -rn "\|${OUTER}|,\|${OUTER}--|H;\${g;s%${INNER}%\6%p;}" 1>&5

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File mimecheck of Package metamail

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