more improvements

- payload now extracts in the right location
- payload checks if the file is already extracted
- etc.

.gitignore

@@ -1,2 +1 @@
-**/pcmi/**
-**/badwolf/**
+tests/**

posix/preload

@@ -1,19 +1,27 @@
 #!/bin/sh -e
 
 # TODO: verify checksum before extracting
-# SUM
 # TODO: extract self without resolving to $0 because it doesn't resolve links
-tail -c +"$(expr BYTES + 1)" $0 | lz4 -dc | tar -x
-# TODO: remove hardcoded directory
-# TODO: use a different extraction path
-cd ID
 
-export ORIGIN="$(pwd)"
-export LD_LIBRARY_PATH="$ORIGIN/lib"
-export PATH="$ORIGIN/bin":$PATH
+if [ -z "$XDG_CACHE_HOME" ]; then
+	destdir=/tmp
+else
+	destdir="$XDG_CACHE_HOME"
+fi
+
+if ! [ "$(head -n 1 "$destdir"/ID/checksum 2>/dev/null)" = 'SUM' ]; then
+	tail -c +BYTES "$0" | lz4 -dc | tar -x -C "$destdir"
+	echo "SUM" > "$destdir"/ID/checksum
+fi
+
+ORIGIN="$destdir"/ID
+LD_LIBRARY_PATH="$ORIGIN/lib"
+PATH="$ORIGIN/bin":$PATH
+export ORIGIN
+export LD_LIBRARY_PATH
+export PATH
 
 # export LD_DEBUG='libs'
 
 # TODO: use $0 instead
-# FIXME: uses the system's basename
-exec bin/"$(basename "$1")"
+exec "$destdir"/ID/bin/"$(basename "$1")"

posix/prepare

@@ -148,7 +148,7 @@ awk '!/^ *#/ && NF' > tpp
 size="$(wc -c tpp | cut -d " " -f1)"
 strsize="$(echo "BYTES" | wc -c)"
 numsize="$(echo "$size" | wc -c)"
-normsize="$((size - (strsize - numsize)))"
+normsize="$((size - (strsize - numsize) + 1))"
 
 sed s/BYTES/"$normsize"/ tpp > tpr
 cat tpr "$DIRNAME".tar.lz4 > "$DIRNAME".ti