4cade/bin/buildfx.sh
2021-10-13 13:11:42 -04:00

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#!/bin/bash
# run from project root directory
# 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 merged-effects file
# 4 - input directory of (previously assembled) effects files
# create or truncate merged-effects file
:>| "$3"
# make temp file with list of effect names
records=$(mktemp)
grep -v "^$" < "$1" | grep -v "^#" | grep -v "^\[" > "$records"
# make temp assembly source file that represents the binary OKVS data structure
source=$(mktemp)
(echo "*=0" # dummy program counter for assembler
echo "!le16 $(wc -l <"$records"), 0" # OKVS header
while read -r key; do
echo "!byte ${#key}+7" # OKVS record length
echo "!byte ${#key}" # OKVS key length
echo "!text \"$key\"" # OKVS key (effect name)
offset=$(wc -c < "$3")
echo "!be24 $offset" # offset into merged-effects file
echo -n "!le16 "
# If offset+size does not cross a block boundary, use the size.
# Otherwise, round up size to the next block boundary.
# This padding does not get added to the file; it is just an
# optimization to avoid a partial copy on the last block read.
size=$(wc -c < "$4/$key")
if [ $(($offset / 512)) -eq $((($offset + $size) / 512)) ]; then
echo "$size"
else
echo "$(((($offset + $size + 511) & -512) - $offset))"
fi
cat "$4/$key" >> "$3" # add effect code into merged-effects file
# (all effects were previously assembled)
done < "$records") > "$source"
# assemble temp source file to create binary OKVS data structure
acme -o "$2" "$source"
# clean up
rm "$source"
rm "$records"