82 lines
2.3 KiB
Bash
Executable File
82 lines
2.3 KiB
Bash
Executable File
#! /bin/bash
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# vim: set tabstop=4 shiftwidth=4 noexpandtab filetype=sh:
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# follows gzip syntax -- acts in place if filename provided, outputs to
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# stdout with -c, accepts stdin and outputs to stdout if filename is - or absent
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# output to stdout?
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if [[ "$1" == "-c" ]]; then
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shift;
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stdout=1;
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else
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stdout=
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fi
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# use stdin?
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if [[ ! $1 || "$1" == "-" ]]; then
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stdin=1
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stdout=1
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elif [[ $1 && ! -f "$1" ]]; then
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echo "usage: dopo [-c] [-|140KdiskImageFilename] 1>&2";
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exit 1;
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else
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stdin=
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fi
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if [[ ! $stdout ]]; then
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#get filename extension, in lowercase
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f="$(tr [:upper:] [:lower:] <<< ${1##*.})";
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#if it's dsk/do/po, get name without extension
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[[ "$f" == "dsk" || "$f" == "do" || "$f" == "po" ]] && of="${1%.*}" || of="$1";
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#if name had .po extension, append .dsk to outfile name, otherwise append .po
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[[ "$f" == "po" ]] && of="$of.dsk" || of="$of.po"
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# set outfile param for dd
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ofile="$of"
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else
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ofile="/tmp/$$.dopo_out"
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fi
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if [[ ! $stdin ]]; then
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# set infile param for dd
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ifile="$1"
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elif [[ -t 0 ]]; then
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echo "usage: dopo [-c] [-|140KdiskImageFilename]" 1>&2; exit 1;
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else
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ifile="/tmp/$$.dopo_in"
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cat > "$ifile"
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fi
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# verify file is 140K by successfully reading 140K'th byte, and failing to read the one past
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[[ $(dd if="$ifile" of=/dev/null bs=1 skip=143359 2>&1 | tail -1 | cut -d ' ' -f 1) -ne 1 || $(dd if="$ifile" of=/dev/null bs=1 skip=143360 2>&1 | tail -1 | cut -d ' ' -f 1) -ne 0 ]] && badInput=1 || badInput=
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if [[ $badInput ]]; then
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if [[ ! $stdin ]]; then
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echo -n "$1 doesn't appear to be a 140K image. Continue? " 1>&2;
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read
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[[ ${REPLY:0:1} == "y" || ${REPLY:0:1} == "Y" ]] || exit 1;
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else
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echo "warning: Input file doesn't appear to be a 140K image." 1>&2
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echo " Output file is likely to be useless." 1>&2
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fi
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fi
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# for each track
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for t in {0..34}; do
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# read each sector in the right sequence to make (or unmake)
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# valid ProDOS blocks (sector pairs)
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for s in 0 14 13 12 11 10 9 8 7 6 5 4 3 2 1 15; do
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# copy the sector from the old file to the new one
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dd if="$ifile" of="$ofile" bs=256 count=1 skip=$(( t*16 + s )) seek=$(( t*16 + (s==0 || s==15 ? s : 15-s) )) 2> /dev/null
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done
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done
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# remove the old one
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[[ ! $stdin && ! $stdout ]] && rm "$1" &> /dev/null
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# dump to stdout if -c or stdin used
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[[ $stdout ]] && { cat $ofile; rm $ofile &> /dev/null; }
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[[ $stdin ]] && rm $ifile &> /dev/null;
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