Add support to decompress files in paz file

Cargo.toml

@@ -91,7 +91,7 @@ kirikiri = ["emote-psb", "fancy-regex", "flate2", "json", "lz4", "utils-escape"]
 kirikiri-arc = ["kirikiri", "adler", "fastcdc", "flate2", "parse-size", "sha2", "xp3", "zstd"]
 kirikiri-img = ["kirikiri", "image", "libtlg-rs"]
 musica = []
-musica-arc = ["musica", "crc32fast", "include-flate", "utils-blowfish", "utils-rc4", "utils-serde-base64bytes", "utils-xored-stream"]
+musica-arc = ["musica", "crc32fast", "flate2", "include-flate", "utils-blowfish", "utils-rc4", "utils-serde-base64bytes", "utils-xored-stream"]
 silky = []
 softpal = ["int-enum"]
 softpal-arc = ["softpal"]

src/scripts/musica/archive/paz.rs

@@ -8,6 +8,7 @@ use crate::utils::serde_base64bytes::Base64Bytes;
 use crate::utils::struct_pack::*;
 use crate::utils::xored_stream::*;
 use anyhow::Result;
+use flate2::read::ZlibDecoder;
 use msg_tool_macro::{StructPack, StructUnpack};
 use serde::Deserialize;
 use std::collections::{BTreeMap, HashMap};
@@ -192,6 +193,12 @@ struct PazEntry {
     flags: u32,
 }
 
+impl PazEntry {
+    pub fn is_compressed(&self) -> bool {
+        (self.flags & 0x1) != 0
+    }
+}
+
 #[derive(Debug)]
 pub struct PazArc {
     stream: Arc<Mutex<MultipleReadStream>>,
@@ -386,13 +393,25 @@ impl Script for PazArc {
                         rc4.skip_bytes(skip as usize);
                     }
                     let stream = Rc4Stream::new(stream, rc4);
+                    if entry.is_compressed() {
+                        let stream = ZlibDecoder::new(stream);
+                        return Ok(Box::new(PazFileEntry::new(entry, stream)));
+                    }
                     return Ok(Box::new(PazFileEntry::new(entry, stream)));
                 }
             }
+            if entry.is_compressed() {
+                let stream = ZlibDecoder::new(stream);
+                return Ok(Box::new(PazFileEntry::new(entry, stream)));
+            }
             return Ok(Box::new(PazFileEntry::new(entry, stream)));
         } else if let Some(mov_key) = &self.mov_key {
             if self.schema.version < 1 {
                 let stream = TableEncryptedStream::new(stream, mov_key.clone())?;
+                if entry.is_compressed() {
+                    let stream = ZlibDecoder::new(stream);
+                    return Ok(Box::new(PazFileEntry::new(entry, stream)));
+                }
                 return Ok(Box::new(PazFileEntry::new(entry, stream)));
             }
             let type_key = self
@@ -416,6 +435,10 @@ impl Script for PazArc {
             let mut rc4 = Rc4::new(&rkey);
             let key_block = rc4.generate_block((entry.size as usize).min(0x10000));
             let stream = XoredKeyStream::new(stream, key_block, 0);
+            if entry.is_compressed() {
+                let stream = ZlibDecoder::new(stream);
+                return Ok(Box::new(PazFileEntry::new(entry, stream)));
+            }
             return Ok(Box::new(PazFileEntry::new(entry, stream)));
         }
         Err(anyhow::anyhow!("Data decryption key not found."))