Add chat log parser

src/lib.rs

@@ -55,4 +55,7 @@ pub mod exd;
 pub mod skeleton;
 
 // Reading file into files (FIIN).
-pub mod fiin;
+pub mod fiin;
+
+// Reading and writing chat logs (LOG)
+pub mod log;

src/log.rs

@@ -0,0 +1,95 @@
+use std::io::{Cursor, Seek, SeekFrom};
+use std::os::unix::raw::time_t;
+use binrw::binread;
+use crate::gamedata::MemoryBuffer;
+use binrw::BinRead;
+
+#[binread]
+pub struct ChatLogHeader {
+    content_size : u32,
+    file_size : u32,
+
+    #[br(count = file_size - content_size)]
+    offset_entries : Vec<u32>
+}
+
+#[binread]
+#[br(repr = u8)]
+#[derive(Debug)]
+enum EventFilter {
+    SystemMessages = 3,
+    Unknown = 20,
+    ProgressionMessage = 64,
+    NPCBattle = 41,
+    Unknown2 = 57,
+    Unknown7 = 29,
+    Unknown3 = 59,
+    EnemyBattle = 170,
+}
+
+#[binread]
+#[derive(Debug)]
+#[br(repr = u8)]
+enum EventChannel {
+    System = 0,
+    ServerAnnouncement = 3,
+    Unknown1 = 50,
+    Unknown7 = 29,
+    Others = 32,
+    Unknown5 = 41,
+    NPCEnemy = 51,
+    NPCFriendly = 59,
+    Unknown4 = 64,
+    Unknown6 = 170,
+}
+
+#[binread]
+#[derive(Debug)]
+pub struct ChatLogEntry {
+    timestamp : u32,
+    filter : EventFilter,
+    channel : EventChannel,
+
+    #[br(temp)]
+    garbage : u32,
+
+    #[br(ignore)]
+    message : String
+}
+
+#[derive(Debug)]
+pub struct ChatLog {
+    entries : Vec<ChatLogEntry>
+}
+
+impl ChatLog {
+    pub fn from_existing(buffer : &MemoryBuffer) -> Option<ChatLog> {
+        let mut cursor = Cursor::new(buffer);
+
+        let header = ChatLogHeader::read(&mut cursor).expect("Cannot parse header.");
+
+        let content_offset = (8 + header.file_size * 4) as u64;
+
+        // beginning of content offset
+        cursor.seek(SeekFrom::Start(content_offset));
+
+        let mut entries = vec![];
+
+        for offset in header.offset_entries {
+            let new_last_offset = content_offset + offset as u64;
+
+            let mut entry = ChatLogEntry::read(&mut cursor).expect("Unable to parse log message.");
+
+            // TODO: handle the coloring properly, in some way
+            entry.message = String::from_utf8_lossy(&*buffer[cursor.position() as usize..new_last_offset as usize].to_vec()).to_string();
+
+            cursor.seek(SeekFrom::Start(new_last_offset));
+
+            entries.push(entry);
+        }
+
+        Some(ChatLog {
+            entries
+        })
+    }
+}