Cue point implementation

src/list_form.rs

@@ -0,0 +1,31 @@
+use super::fourcc::{FourCC, ReadFourCC};
+use byteorder::{ReadBytesExt, LittleEndian};
+use std::io::{Cursor, Error, Read};
+
+pub struct ListFormItem {
+    pub signature : FourCC,
+    pub contents : Vec<u8>
+}
+
+/// A helper that will accept a LIST chunk as a [u8]
+/// and give you back each segment
+/// 
+pub fn collect_list_form(list_contents :& [u8]) -> Result<Vec<ListFormItem>, Error> {
+    let mut cursor = Cursor::new(list_contents);
+    let mut remain = list_contents.len();
+    let _ = cursor.read_fourcc()?; // skip signature
+
+    remain -= 4;
+    let mut retval : Vec<ListFormItem> = vec![];
+
+    while remain > 0 {
+        let this_sig = cursor.read_fourcc()?;
+        let this_size = cursor.read_u32::<LittleEndian>()? as usize;
+        let mut content_buf = vec![0u8; this_size];
+
+        cursor.read_exact(&mut content_buf)?;
+        retval.push( ListFormItem { signature : this_sig, contents : content_buf } );
+    }
+
+    Ok( retval )
+}