From 00a0086a961f6423db4e8f7a41c66cc479842d2a Mon Sep 17 00:00:00 2001
From: Mike Welsh <mwelsh@gmail.com>
Date: Sat, 10 Sep 2016 16:55:09 -0700
Subject: [PATCH] Implement SymbolClass tag

---
 src/read.rs                |  14 +++++++++++++-
 src/test_data.rs           |   9 +++++++++
 src/types.rs               |   8 +++++++-
 src/write.rs               |  11 +++++++++++
 tests/swfs/symbolclass.fla | Bin 0 -> 4382 bytes
 tests/swfs/symbolclass.swf | Bin 0 -> 570 bytes
 6 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 tests/swfs/symbolclass.fla
 create mode 100644 tests/swfs/symbolclass.swf

diff --git a/src/read.rs b/src/read.rs
index 8339a86e8..6f0355244 100644
--- a/src/read.rs
+++ b/src/read.rs
@@ -358,7 +358,7 @@ impl<R: Read> Reader<R> {
                 }
                 Tag::ImportAssets { url: url, imports: imports }
             },
-            
+
             Some(TagCode::SetBackgroundColor) => {
                 Tag::SetBackgroundColor(try!(tag_reader.read_rgb()))
             },
@@ -379,6 +379,18 @@ impl<R: Read> Reader<R> {
                 tab_index: try!(tag_reader.read_u16()),
             },
 
+            Some(TagCode::SymbolClass) => {
+                let num_symbols = try!(tag_reader.read_u16());
+                let mut symbols = Vec::with_capacity(num_symbols as usize);
+                for _ in 0..num_symbols {
+                    symbols.push(SymbolClassLink {
+                        id: try!(tag_reader.read_u16()),
+                        class_name: try!(tag_reader.read_c_string()),
+                    });
+                }
+                Tag::SymbolClass(symbols)
+            },
+
             Some(TagCode::ExportAssets) => {
                 let num_exports = try!(tag_reader.read_u16());
                 let mut exports = Vec::with_capacity(num_exports as usize);
diff --git a/src/test_data.rs b/src/test_data.rs
index f28981940..5e14e874f 100644
--- a/src/test_data.rs
+++ b/src/test_data.rs
@@ -335,6 +335,15 @@ pub fn tag_tests() -> Vec<TagTestData> { vec![
 
     (1, Tag::ShowFrame, vec![0b01_000000, 0]),
 
+    (
+        9,
+        Tag::SymbolClass(vec![
+            SymbolClassLink { id: 2, class_name: "foo.Test".to_string() },
+            SymbolClassLink { id: 0, class_name: "DocumentTest".to_string() },
+        ]),
+        read_tag_bytes_from_file("tests/swfs/symbolclass.swf", TagCode::SymbolClass)
+    ),
+
     (1, Tag::Unknown { tag_code: 512, data: vec![] }, vec![0b00_000000, 0b10000000]),
     (1, Tag::Unknown { tag_code: 513, data: vec![1, 2] },  vec![0b01_000010, 0b10000000, 1, 2]),
     (
diff --git a/src/types.rs b/src/types.rs
index 1909dccec..18f0dd3e0 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -284,7 +284,7 @@ pub enum Tag {
     ImportAssets { url: String, imports: Vec<ExportedAsset> },
     SetBackgroundColor(Color),
     SetTabIndex { depth: Depth, tab_index: u16 },
-
+    SymbolClass(Vec<SymbolClassLink>),
     PlaceObject(Box<PlaceObject>),
     RemoveObject { depth: Depth, character_id: Option<CharacterId> },
 
@@ -305,6 +305,12 @@ pub struct ExportedAsset {
     pub name: String,
 }
 
+#[derive(Debug,PartialEq,Clone)]
+pub struct SymbolClassLink {
+    pub id: CharacterId,
+    pub class_name: String
+}
+
 #[derive(Debug,PartialEq)]
 pub struct Shape {
     pub version: u8,
diff --git a/src/write.rs b/src/write.rs
index 39707026a..6bd5fec71 100644
--- a/src/write.rs
+++ b/src/write.rs
@@ -405,6 +405,17 @@ impl<W: Write> Writer<W> {
                 try!(self.write_i16(depth));
             },
 
+            &Tag::SymbolClass(ref symbols) => {
+                let len = symbols.iter().map(|e| e.class_name.len() as u32 + 3).sum::<u32>()
+                            + 2;
+                try!(self.write_tag_header(TagCode::SymbolClass, len));
+                try!(self.write_u16(symbols.len() as u16));
+                for &SymbolClassLink {id, ref class_name} in symbols {
+                    try!(self.write_u16(id));
+                    try!(self.write_c_string(class_name));
+                }
+            },
+
             &Tag::FileAttributes(ref attributes) => {
                 try!(self.write_tag_header(TagCode::FileAttributes, 4));
                 let mut flags = 0u32;
diff --git a/tests/swfs/symbolclass.fla b/tests/swfs/symbolclass.fla
new file mode 100644
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diff --git a/tests/swfs/symbolclass.swf b/tests/swfs/symbolclass.swf
new file mode 100644
index 0000000000000000000000000000000000000000..5c6d49de5e3f37a1329a9368db591412fd2b9888
GIT binary patch
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