Add RVP/MVP extractor

src/formats/rvp.rs

@@ -0,0 +1,129 @@
+use std::fs::File;
+use std::path::Path;
+use std::fs::{self, OpenOptions};
+use std::io::{Write, Read, Cursor, Seek};
+
+use crate::common;
+
+fn decrypt_xor(data: &[u8]) -> Vec<u8> {
+    let key_bytes = b"\xCC\xF0\xC8\xC4\xC6\xCA\xCC\xDA\xC6\xCA\xCC\xDA\xC6\xCA\xCC\xDA\xC6\xCA\xCC\xDA\xC6\xCA\xCC\xDA\xC6\xCA\xCC\xDA\xC6\xCA\xCC\xDA";
+    data.iter()
+        .enumerate()
+        .map(|(i, &byte)| byte ^ key_bytes[i % key_bytes.len()])
+        .collect()
+}
+
+pub fn is_rvp_file(mut file: &File) -> bool {
+    //MVP
+    let header = common::read_file(&file, 0, 4).expect("Failed to read from file.");
+    if header == b"UPDT" {
+        file.seek(std::io::SeekFrom::Start(36)).expect("Failed to seek"); //skip rest of header
+        return true;
+    }
+
+    //RVP
+    let bytes = common::read_file(&file, 16, 18).expect("Failed to read from file.");
+    for (_i, &b) in bytes.iter().enumerate().step_by(2) {
+        if b != 0xA3 {
+            return false;
+        }
+    }
+    file.seek(std::io::SeekFrom::Start(64)).expect("Failed to seek"); //skip rest of header
+    true
+}
+
+pub fn extract_rvp(mut file: &File, output_folder: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let mut obf_data = Vec::new();  //we sadly cannot deXOR on the fly because of its 32 byte pattern
+    file.read_to_end(&mut obf_data)?;
+    println!("DeXORing data..");
+    let data = decrypt_xor(&obf_data); 
+    let mut data_reader = Cursor::new(data);
+
+    let _unknown = common::read_exact(&mut data_reader, 256)?; //seems to be mostly the same between files
+
+    let mut i = 0;
+    while (data_reader.position() as usize) < data_reader.get_ref().len() {
+        i += 1;
+        let header_size_bytes = common::read_exact(&mut data_reader, 4)?;
+        let header_size = u32::from_be_bytes(header_size_bytes.try_into().unwrap());
+        println!("\nEntry {} - Offset: {}, Header size: {}", i, data_reader.position() - 4, header_size);
+        let hdr = common::read_exact(&mut data_reader, header_size as usize)?;
+
+        let size;
+        let mut name = String::new();
+        if i == 1 { //first entry always has this big header
+            let hdr_string = String::from_utf8_lossy(&hdr);
+            let lines: Vec<String> = hdr_string.lines().map(|l| l.trim().to_string()).collect();
+            //1. maybe target? always "ALL" in japanese, "BD-HP50" in usa hp50
+            //2. always "host"
+            //3. unknown, like "0B01"
+            //4. unknown, like "00000111"
+            //5. always "FFFF"
+            //6. always "FFFF"
+            //7. always "3" or "0"
+            //8. always "88005004"
+            //9. always "88005004"
+            //10. always "88005000"
+            //11. size as decimal string, like "12320768"
+            //12. unknown, differing hex string like "F8833EE1"
+            //13. crc32 checksum like "3827E120"
+            let target = &lines[0];
+            size = lines[10].parse().unwrap();
+            let crc32 = &lines[12];
+            println!("Target: {}", target);
+            println!("CRC32: {}", crc32);
+
+        } else if header_size == 32 {
+            let hdr_string = String::from_utf8_lossy(&hdr);
+            let lines: Vec<String> = hdr_string.lines().map(|l| l.trim().to_string()).collect();
+            //1. CRC32 checksum like "34D0757C"
+            //2. unknown - "FFFFFFFF"
+            //3. size in hex string like "00040000"
+            let crc32 = &lines[0];
+            size = u32::from_str_radix(&lines[2], 16).unwrap();
+            println!("CRC32: {}", crc32);
+
+        } else if header_size == 48 || header_size == 44 || header_size == 40 {
+            let hdr_string = String::from_utf8_lossy(&hdr);
+            let lines: Vec<String> = hdr_string.lines().map(|l| l.trim().to_string()).collect();
+            //1. - name, like "L12_110.IMG"
+            //2. - size in hex string like "001E6388"
+            //3. - unknown - single number like "3"
+            //4. - crc32 checksum like "0BC0F6F7"
+            //5. - unknown - like "00011200" -- this line is not present when size is 40 but were not using it anyway so whatever
+            name = lines[0].clone();
+            size = u32::from_str_radix(&lines[1], 16).unwrap();
+            let crc32 = &lines[3];
+            println!("File name: {}", name);
+            println!("CRC32: {}", crc32);
+
+        } else if header_size == 16 {
+            // 4 bytes CRC32
+            // 4 bytes unknown "FF FF FF FF"
+            // 4 bytes size
+            // 4 bytes unknown "00 00 00 00"
+            let crc32 = hex::encode_upper(&hdr[0..4]);
+            size = u32::from_be_bytes(hdr[8..12].try_into().unwrap());
+            println!("CRC32: {}", crc32);
+
+        } else {
+            println!("Unsupported header size!");
+            break
+
+        }
+
+        println!("Size: {}", size);
+        let data = common::read_exact(&mut data_reader, size as usize)?;
+        let output_path = Path::new(&output_folder).join(if name=="" {format!("{}.bin", i)} else {format!("{}_{}.bin", i, name)});
+
+        fs::create_dir_all(&output_folder)?;
+        let mut out_file = OpenOptions::new().write(true).create(true).open(output_path)?;      
+        out_file.write_all(&data)?;
+
+        println!("- Saved file!");
+    }
+
+    println!("\nExtraction finished!");
+
+    Ok(())
+}