4cade/bin/buildindexedfile.sh

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#!/bin/bash
# flags
# -a append to data file (default off = truncate)
# -p pad sizes within data file to next block size (default off)
# parameters
# 1 - input filename of text file containing list of effects (probably FX.CONF or DFX.CONF)
# 2 - output filename for index file
# 3 - output filename for data file
# 4 - input directory of files to merge into data file
pad=false
append=false
standardsize=0
while getopts ":ap" opt; do
case $opt in
a) append=true
;;
p) pad=true
;;
esac
done
shift $((OPTIND-1))
if [ -f "$4"/STANDARD ]; then
cp "$4"/STANDARD "$3"
standardsize=$(wc -c < "$3")
elif [ "$append" = false ]; then
rm -f "$3"
fi
touch "$3"
# make temp file with list of lines that contain keys
records=$(mktemp)
awk '!/^$|^#|^\[/ { print }' < "$1" > "$records"
# make temp assembly source file that represents the binary OKVS data structure
source=$(mktemp)
(echo "*=0" # dummy program counter for assembler
echo "!le16 $(wc -l <"$records"), 0" # OKVS header
while IFS="=" read -r key value; do
echo "!byte ${#key}+7" # OKVS record length
echo "!byte ${#key}" # OKVS key length
echo "!text \"$key\"" # OKVS key
if [ -f "$4/$key" ]; then # if file exists, determine offset and size
offset=$(wc -c < "$3")
echo "!be24 $offset" # offset into merged data file
echo -n "!le16 "
size=$(wc -c < "$4/$key")
if [ "$pad" = true ]; then
# If offset+size does not cross a block boundary, use file's true size.
# Otherwise, round up size to the next block boundary.
# This padding does not get added to the file; it is just an
# optimization to avoid a partial copy on the last block read.
if [ $(($offset / 512)) -eq $((($offset + $size) / 512)) ]; then
echo "$size"
else
echo "$(((($offset + $size + 511) & -512) - $offset))"
fi
else
# Caller said never pad, so always use file's true size.
echo "$size"
fi
cat "$4/$key" >> "$3" # append this file to the end of the merged data file
else # if file does not exist, reuse placeholder at offset 0
echo "!be24 0"
echo "!le16 $standardsize"
fi
done < "$records") > "$source"
# assemble temp source file to create binary OKVS data structure
acme -o "$2" "$source"
# clean up
rm "$source"
rm "$records"