From 00dd37604d50cbf3fb27ec0631b4d4b6d2ee893a Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi92@disroot.org>
Date: Mon, 6 Oct 2025 23:02:51 +0200
Subject: Implement directory download as ZIP

Thanks to the fdzipstream library [1] and zlib [2], it is possible to
generate ZIP files on-the-fly, therefore requiring no extra disk space
usage and only a small amount of memory.

Unfortunately, as of the time of this writing fdzipstream is not
packaged by any distributions yet [3], so it had to be imported as a git
submodule as a workaround.

While libarchive [4] could be an interesting alternative, writing ZIP
files is only supported by very recent versions (>= 3.8.0), which are
still not packaged by many distributions [5], either.

Moreover, libarchive is a package with several dependencies other than
zlib and is significantly larger compared to fdzipstreams, so
fdzipstreams was ultimately considered a better fit for this purpose.

[1]: https://github.com/CTrabant/fdzipstream.git
[2]: http://zlib.net/
[3]: https://repology.org/projects/?search=fdzipstream
[4]: https://www.libarchive.org/
[5]: https://repology.org/project/libarchive/versions
---
 configure | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

(limited to 'configure')

diff --git a/configure b/configure
index 0c5a7b3..3328319 100755
--- a/configure
+++ b/configure
@@ -71,6 +71,18 @@ else
 	LDFLAGS="$LDFLAGS -Llibweb -lweb"
 fi
 
+if pkg-config fdzipstream
+then
+	in_tree_fdzipstream=0
+	CFLAGS="$CFLAGS $(pkg-config --cflags fdzipstream)"
+	LDFLAGS="$LDFLAGS $(pkg-config --libs fdzipstream)"
+else
+	echo "Info: fdzipstream not found. Using in-tree copy" >&2
+	in_tree_fdzipstream=1
+	CFLAGS="$CFLAGS -Ifdzipstream/fdzipstream"
+	LDFLAGS="$LDFLAGS -Lfdzipstream -lfdzipstream -lz"
+fi
+
 cleanup()
 {
 	rm -f $F
@@ -101,7 +113,8 @@ OBJECTS = \
 	jwt.o \
 	main.o \
 	page.o \
-	style.o
+	style.o \
+	zip.o
 
 all: $(PROJECT)
 
@@ -138,6 +151,16 @@ $(LIBWEB): FORCE
 EOF
 fi
 
+if [ $in_tree_fdzipstream -ne 0 ]
+then
+cat <<"EOF" >> $F
+FDZIPSTREAM = fdzipstream/libfdzipstream.a
+$(PROJECT): $(FDZIPSTREAM)
+$(FDZIPSTREAM): FORCE
+	+cd fdzipstream && $(MAKE) CC=$(CC)
+EOF
+fi
+
 cat <<"EOF" >> $F
 clean:
 	rm -f $(OBJECTS) $(DEPS)
@@ -157,6 +180,13 @@ cat <<"EOF" >> $F
 EOF
 fi
 
+if [ $in_tree_fdzipstream -ne 0 ]
+then
+cat <<"EOF" >> $F
+	+cd fdzipstream && $(MAKE) clean
+EOF
+fi
+
 cat <<"EOF" >> $F
 distclean: clean
 	rm -f slcl
-- 
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