1 files changed, 43 insertions, 0 deletions
diff --git a/matroska/src/block.rs b/matroska/src/block.rs
index e69de29..b0d6f6b 100644
--- a/matroska/src/block.rs
+++ b/matroska/src/block.rs
@@ -0,0 +1,43 @@
+use crate::read::ReadExt;
+use anyhow::Result;
+use std::io::Cursor;
+
+pub enum LacingType {
+    FixedSize,
+    Ebml,
+    Xiph,
+}
+
+pub struct Block {
+    pub track: u64,
+    pub timestamp_off: i16,
+    pub invisible: bool,
+    pub lacing: Option<LacingType>,
+    pub data: Vec<u8>,
+}
+
+impl Block {
+    pub fn parse(buf: &[u8]) -> Result<Self> {
+        let (track, c) = Cursor::new(buf).read_vint_len()?;
+        let timestamp_off = i16::from_be_bytes(buf[c..c + 2].try_into().unwrap());
+        let flags = buf[c + 2];
+        let data = Vec::from(&buf[c + 3..]);
+
+        let invisible = (flags & 0b10000) == 0b10000;
+        let lacing = match flags & 0b1100 {
+            0b0000 => None,
+            0b0100 => Some(LacingType::Xiph),
+            0b1000 => Some(LacingType::Ebml),
+            0b1100 => Some(LacingType::FixedSize),
+            _ => unreachable!(),
+        };
+
+        Ok(Self {
+            track,
+            data,
+            invisible,
+            lacing,
+            timestamp_off,
+        })
+    }
+}