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
---
 fdzipstream/CMakeLists.txt |  6 ++++++
 fdzipstream/Makefile       | 21 +++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 fdzipstream/CMakeLists.txt
 create mode 100644 fdzipstream/Makefile

(limited to 'fdzipstream')

diff --git a/fdzipstream/CMakeLists.txt b/fdzipstream/CMakeLists.txt
new file mode 100644
index 0000000..101a117
--- /dev/null
+++ b/fdzipstream/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.13)
+project(fdzipstream LANGUAGES C)
+find_package(ZLIB REQUIRED)
+add_library(${PROJECT_NAME} fdzipstream/fdzipstream.c)
+target_include_directories(${PROJECT_NAME} PUBLIC fdzipstream)
+target_link_libraries(${PROJECT_NAME} PUBLIC ${ZLIB_LIBRARIES})
diff --git a/fdzipstream/Makefile b/fdzipstream/Makefile
new file mode 100644
index 0000000..7e81636
--- /dev/null
+++ b/fdzipstream/Makefile
@@ -0,0 +1,21 @@
+.POSIX:
+
+PROJECT = libfdzipstream.a
+CFLAGS = -O1 -g -D_POSIX_C_SOURCE=200809L
+
+OBJECTS = \
+	fdzipstream.o
+
+all: $(PROJECT)
+
+clean:
+	rm -f $(OBJECTS)
+
+distclean: clean
+	rm -f $(PROJECT)
+
+$(PROJECT): $(OBJECTS)
+	$(AR) $(ARFLAGS) $@ $(OBJECTS)
+
+%.o: fdzipstream/%.c
+	$(CC) $(CFLAGS) -c $< -o $@
-- 
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