From c67c44bac27e84b810152ec13216eae39b780d66 Mon Sep 17 00:00:00 2001
From: Bastian Dehn <hhaalo@arcor.de>
Date: Fri, 25 Sep 2026 19:21:48 +0200
Subject: [PATCH] add test for encode cover

---
 src/lib/vorbis.sh | 49 +++++++++++++++++++++++++++++++++++++++++++++++
 tests/vorbis.bats | 26 +++++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff --git a/src/lib/vorbis.sh b/src/lib/vorbis.sh
index f25fc56..4a99d5d 100644
--- a/src/lib/vorbis.sh
+++ b/src/lib/vorbis.sh
@@ -28,4 +28,53 @@ vorbis_check_programs()
 		|| return $?
 }
 
+vorbis_write_number_to_byte()
+{
+	local number="$1"
+	local hex_number=
+	hex_number=$(printf "%08x" "$number")
+
+	for i in {0..6..2}; do
+		printf "%b" "\x${hex_number:$i:2}"
+	done
+}
+
+vorbis_cover_to_metadata()
+{
+	local cover="$1"
+	local covermetadata="${cover/.jpg/.txt}"
+	local filesize=$(wc --bytes "$cover")
+	filesize=${filesize/ */}
+
+	{
+		# picture typ (jpg)
+		vorbis_write_number_to_byte "3"
+		# mime type (image/jpeg)
+		vorbis_write_number_to_byte "10"
+		printf "%s" "image/jpeg"
+		# description length (zero)
+		vorbis_write_number_to_byte "0"
+		# width (zero)
+		vorbis_write_number_to_byte "0"
+		# heigth (zero)
+		vorbis_write_number_to_byte "0"
+		# color depth (zero)
+		vorbis_write_number_to_byte "0"
+		# color count (zero)
+		vorbis_write_number_to_byte "0"
+		# file size
+		vorbis_write_number_to_byte "$filesize"
+		cat "$cover"
+	} > "$covermetadata"
+}
+
+vorbis_encode()
+{
+	local work_path="$1"
+	find "$work_path" -name '*.jpg' \
+		| sort \
+		| parallel --will-cite --ungroup \
+		vorbis_cover_to_metadata {}
+}
+
 vorbis_check_programs || return $?
\ No newline at end of file
diff --git a/tests/vorbis.bats b/tests/vorbis.bats
index 4dc23d1..9073924 100755
--- a/tests/vorbis.bats
+++ b/tests/vorbis.bats
@@ -3,9 +3,14 @@
 setup() {
 	bats_load_library 'bats-support'
 	bats_load_library 'bats-assert'
+	mkdir --parents "build/tests/output"
 	source "src/lib/vorbis.sh"
 }
 
+teardown() {
+	rm --recursive --force "build"
+}
+
 # bats test_tags=vorbis:check_programs
 @test "failed: check programs missing flac" {
 	command() {
@@ -64,4 +69,25 @@ setup() {
 
 	assert_failure
 	assert_line --index 0 "❌ ERROR: command parallel not found"
+}
+
+# bats test_tags=vorbis:covermetadata
+@test "success: cover to metdata file" {
+	echo "testfile" > "build/tests/output/test.jpg"
+	{
+		printf "\x00\x00\x00\x03"
+		printf "\x00\x00\x00\x0a"
+		printf "image/jpeg"
+		printf "\x00\x00\x00\x00"
+		printf "\x00\x00\x00\x00"
+		printf "\x00\x00\x00\x00"
+		printf "\x00\x00\x00\x00"
+		printf "\x00\x00\x00\x00"
+		printf "\x00\x00\x00\x09"
+		printf "testfile\n"
+	} > "build/tests/output/expectedcover.txt"
+
+	run vorbis_cover_to_metadata "build/tests/output/test.jpg"
+
+	diff "build/tests/output/test.txt" "build/tests/output/expectedcover.txt"
 }
\ No newline at end of file
-- 
2.47.3