jmmt: add texture formats

This commit also adds a skeleton for a texture tool.

Cargo.toml

@@ -1,7 +1,8 @@
 [workspace]
 #resolver = "2"
 members = [
-    "crates/jmmt",
+	"crates/jmmt",
-	"crates/jmrenamer"
+	"crates/jmrenamer",
-#    "crates/paktool"
+	"crates/textool"
+#	"crates/paktool"
 ]

crates/jmmt/src/format/mod.rs

@@ -1,10 +1,37 @@
-//! Low-level structure definitions
+//! Low-level file format definitions. These are suitable for usage with the [binext] crate,
+//! which just so happens to be a dependency of this crate! Funny how things work.
 
 pub mod package;
 pub mod package_toc;
+pub mod ps2_texture;
+pub mod ps2_palette;
 
 /// A trait validatable format objects should implement.
+/// TODO: integrate this with some FourCC crate, or re-invent the wheel.
 pub trait Validatable {
 	/// Returns true if the object is valid, false otherwise.
 	fn valid(&self) -> bool;
 }
+
+/// Make a Rust [String] from a byte slice that came from a C string/structure. 
+/// 
+/// # Usage
+/// 
+/// The byte slice has to be a valid UTF-8 string.
+/// (Note that in most cases, ASCII strings are valid UTF-8, so this isn't something you'll particularly
+/// have to worry about).
+/// 
+/// # Safety
+/// 
+/// This function does not directly make use of any unsafe Rust code.
+pub fn make_c_string(bytes: &[u8]) -> Option<String> {
+    let bytes_without_null = match bytes.iter().position(|&b| b == 0) {
+        Some(ix) => &bytes[..ix],
+        None => bytes,
+    };
+
+	match std::str::from_utf8(bytes_without_null).ok() {
+		Some(string) => Some(String::from(string)),
+		None => None
+	}
+}

crates/jmmt/src/format/package.rs

@@ -18,6 +18,7 @@ pub struct PackageEofHeader {
 
 /// A Package Group. I have no idea what this is yet
 #[repr(C)]
+#[derive(Debug, Default)]
 pub struct PackageGroup {
 	pub fourcc: u32,
 
@@ -44,6 +45,7 @@ impl Validatable for PackageGroup {
 
 /// A package file chunk.
 #[repr(C)]
+#[derive(Debug, Default)]
 pub struct PackageFileChunk {
 	pub fourcc: u32,
 

crates/jmmt/src/format/package_toc.rs

@@ -1,5 +1,7 @@
 //! Package.toc structures
 
+use super::make_c_string;
+
 /// An entry inside the `package.toc` file
 #[derive(Debug)]
 #[repr(C)]
@@ -15,7 +17,7 @@ pub struct PackageTocEntry {
 
 impl PackageTocEntry {
 	fn file_name(&self) -> Option<String> {
-		String::from_utf8(self.file_name.to_vec()).ok()
+		make_c_string(&self.file_name)
 	}
 
 	fn file_name_hash(&self) -> u32 {

crates/jmmt/src/format/ps2_palette.rs

@@ -0,0 +1,32 @@
+//! .ps2_palette structures
+
+use super::Validatable;
+
+/// .ps2_palette header
+#[repr(C)]
+#[derive(Debug, Default)]
+pub struct Ps2PaletteHeader {
+	pub fourcc: u32,
+	pub unk: u32,
+	pub unk2: u16,
+
+	pub color_count: u16,
+	pub palette_bpp: u16,
+	pub unk3: u16,
+
+	pub data_start: u32,
+	pub header_size: u32,
+
+	pub pad: [u32; 6] // reserved for game code, like .ps2_texture?
+}
+
+impl Ps2PaletteHeader {
+	/// 'PAL1'
+	pub const VALID_FOURCC : u32 = 0x314c4150;
+}
+
+impl Validatable for Ps2PaletteHeader {
+	fn valid(&self) -> bool {
+		self.fourcc == Self::VALID_FOURCC && self.header_size == 0x18
+	}
+}

crates/jmmt/src/format/ps2_texture.rs

@@ -0,0 +1,44 @@
+//! .ps2_texture structures
+
+use super::Validatable;
+
+/// .ps2_texture header.
+#[repr(C)]
+#[derive(Debug, Default)]
+pub struct Ps2TextureHeader {
+	pub magic: u32,
+	pub unk: u32,
+	pub unk2: u16,
+	pub width: u16,
+	pub height: u16,
+
+	/// bits-per-pixel of the texture data. Anything above 8
+	/// will not have an associated .ps2_palette file,
+	/// since the texture data will not be indirect color.
+	pub bpp: u16,
+
+	/// Data start offset.
+	pub data_start_offset: u32,
+
+	/// Possibly the size of this header.
+	pub header_end_offset: u32,
+
+	pub unk6: [u32; 8], // mostly unrelated values, this is probably padding space for the game code to put stuff
+}
+
+impl Ps2TextureHeader {
+	/// 'TEX1'
+	pub const VALID_FOURCC: u32 = 0x31584554;
+
+	fn has_palette(&self) -> bool {
+		// if the BPP is less than or equal to 8 (I've only seen 8bpp and 16bpp),
+		// then the texture will be palettized.
+		self.bpp >= 8
+	}
+}
+
+impl Validatable for Ps2TextureHeader {
+	fn valid(&self) -> bool {
+		self.magic == Self::VALID_FOURCC && self.header_end_offset == 0x38
+	}
+}

crates/jmmt/src/lib.rs

@@ -10,3 +10,6 @@ pub mod lzss;
 // higher level I/O?
 // pub mod read;
 // pub mod write;
+
+// Maybe, using package.toc?
+// pub mod pakfs;

crates/jmmt/src/lzss/header.rs

@@ -2,6 +2,7 @@ use std::mem::size_of;
 use crate::format::Validatable;
 
 #[repr(C)]
+#[derive(Debug, Default)]
 pub struct LzssHeader {
 	pub next: u32, // ps2 ptr. usually 0 cause theres no next header
 	pub byte_id: u8,

crates/textool/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "textool"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.3.8", features = ["derive"] }
+image = "0.24.6"
+jmmt = { path = "../jmmt" }
+
+# Temporary, until the reader code is thrown into jmmt crate
+binext = "1.0.0"

crates/textool/src/main.rs

@@ -0,0 +1,65 @@
+use clap::{Parser, Subcommand};
+
+use std::default;
+use std::path::Path;
+use std::fs::{
+	File
+};
+
+use jmmt::format::{
+	ps2_palette::*,
+	ps2_texture::*
+};
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+#[command(propagate_version = true)]
+struct Cli {
+	#[command(subcommand)]
+	command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+	/// Exports the texture to a .png file
+	Export { path: String },
+
+	//Import
+}
+
+struct ImageReader {
+	file: File,
+	header: Ps2TextureHeader,
+	pal_header: Ps2PaletteHeader,
+
+	image_data: Vec<u8>,
+	palette_data: Vec<u8>
+}
+
+impl ImageReader {
+	fn new(file: &mut File) -> Self {
+		ImageReader {
+			file: file.try_clone().unwrap(),
+			header: Ps2TextureHeader::default(),
+			pal_header: Ps2PaletteHeader::default(),
+			image_data: Vec::default(),
+			palette_data: Vec::default()
+		}
+	}
+
+	fn read(&mut self) -> std::io::Result<()> {
+		
+		Ok(())
+	}
+}
+
+fn main() {
+	let cli = Cli::parse();
+
+	match &cli.command {
+		Commands::Export { path } => {
+			println!("exporting {}", path);
+			let path = Path::new(path);
+		}
+	}
+}