Separate flac

Signed-off-by: Serial <69764315+Serial-ATA@users.noreply.github.com>

src/components/logic/flac.rs

@@ -0,0 +1,53 @@
+#![cfg(feature = "format-flac")]
+
+use crate::{Picture, Result};
+
+use metaflac::BlockType;
+use std::borrow::Cow;
+use std::collections::HashMap;
+use std::io::{Read, Seek, SeekFrom, Write};
+
+pub(crate) fn write_to<T>(
+	mut data: T,
+	vendor: &str,
+	comments: &HashMap<String, String>,
+	pictures: &Option<Cow<'static, [Picture]>>,
+) -> Result<()>
+where
+	T: Read + Write + Seek,
+{
+	let mut tag = metaflac::Tag::read_from(&mut data)?;
+
+	tag.remove_blocks(BlockType::VorbisComment);
+	tag.remove_blocks(BlockType::Picture);
+	tag.remove_blocks(BlockType::Padding);
+
+	let mut comment_collection: HashMap<String, Vec<String>> = HashMap::new();
+
+	if let Some(pics) = pictures.clone() {
+		let mut pics_final = Vec::new();
+
+		for pic in pics.iter() {
+			pics_final.push(base64::encode(pic.as_apic_bytes()));
+		}
+
+		comment_collection.insert(String::from("METADATA_BLOCK_PICTURE"), pics_final);
+	}
+
+	for (k, v) in comments.clone() {
+		comment_collection.insert(k, vec![v]);
+	}
+
+	let comments = metaflac::Block::VorbisComment(metaflac::block::VorbisComment {
+		vendor_string: vendor.to_string(),
+		comments: comment_collection,
+	});
+
+	tag.push_block(comments);
+
+	data.seek(SeekFrom::Start(0))?;
+
+	tag.write_to(&mut data)?;
+
+	Ok(())
+}