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introduce concept of context in various format, to communicate information found in detection phase to extractor

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- this does bring inconsistency to the detectors of formats, but  I will work on fixing that. all detectors should be using Result<> anyway.
- also add some static values to mtk_pkg , mtk_bdp
- these improvements will be applied to other formats in future as well
This commit is contained in:
theubusu
2026-02-02 01:54:35 +01:00
parent 13482802ba
commit cf46b29e3d
7 changed files with 172 additions and 129 deletions
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src/formats/mtk_pkg_old.rs
+11 -7
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@@ -12,6 +12,8 @@ static KEY: u32 = 0x94102909; //09 29 10 94
static HEADER_XOR_MASK: u32 = 0x04BE7C75; //75 7C BE 04
static CONTENT_XOR_MASK: u32 = 0x04BE7C72; //72 7C BE 04
use crate::formats::mtk_pkg::{MTK_HEADER_MAGIC, MTK_META_MAGIC, MTK_META_PAD_MAGIC};
#[derive(BinRead)]
struct Header {
#[br(count = 4)] vendor_magic_bytes: Vec<u8>,
@@ -53,16 +55,18 @@ impl PartEntry {
}
}
static HEADER_SIZE: usize = 0x98;
pub fn is_mtk_pkg_old_file(mut file: &File) -> bool {
let encrypted_header = common::read_file(&file, 0, 152).expect("Failed to read from file.");
let encrypted_header = common::read_file(&file, 0, HEADER_SIZE).expect("Failed to read from file.");
let header = decrypt(&encrypted_header, KEY, Some(HEADER_XOR_MASK));
if &header[4..12] == b"#DH@FiRm" {
if &header[4..12] == MTK_HEADER_MAGIC {
true
} else if &header[68..76] == b"#DH@FiRm" {
} else if &header[68..76] == MTK_HEADER_MAGIC {
//check for 64 byte additional header used in some Sony and Philips firmwares and skip it
file.seek(std::io::SeekFrom::Start(64)).expect("Failed to seek");
true
} else if &header[132..140] == b"#DH@FiRm" {
} else if &header[132..140] == MTK_HEADER_MAGIC {
//check for 128 byte additional header used in some Philips firmwares and skip it
file.seek(std::io::SeekFrom::Start(128)).expect("Failed to seek");
true
@@ -73,7 +77,7 @@ pub fn is_mtk_pkg_old_file(mut file: &File) -> bool {
pub fn extract_mtk_pkg_old(mut file: &File, output_folder: &str) -> Result<(), Box<dyn std::error::Error>> {
let file_size = file.metadata()?.len();
let encrypted_header = common::read_exact(&mut file, 152)?;
let encrypted_header = common::read_exact(&mut file, HEADER_SIZE)?;
let header = decrypt(&encrypted_header, KEY, Some(HEADER_XOR_MASK));
let mut hdr_reader = Cursor::new(header);
let hdr: Header = hdr_reader.read_le()?;
@@ -101,9 +105,9 @@ pub fn extract_mtk_pkg_old(mut file: &File, output_folder: &str) -> Result<(), B
}
//strip iMtK thing and get version
let extra_header_len = if &out_data[0..4] == b"iMtK" {
let extra_header_len = if &out_data[0..4] == MTK_META_MAGIC {
let imtk_len = u32::from_le_bytes(out_data[4..8].try_into().unwrap());
if &out_data[8..12] != b"iPAd" {
if &out_data[8..12] != MTK_META_PAD_MAGIC {
let version_len = u32::from_le_bytes(out_data[8..12].try_into().unwrap());
let version = common::string_from_bytes(&out_data[12..12 + version_len as usize]);
println!("- Version: {}", version);