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|
use super::*;
use std::convert::*;
pub struct Blob<'a> {
pub file: usize,
pub slice: &'a [u8],
}
impl<'a> std::ops::Deref for Blob<'a> {
type Target = [u8];
fn deref(&self) -> &[u8] {
self.slice
}
}
impl<'a> Blob<'a> {
pub fn new(file: usize, slice: &'a [u8]) -> Self {
Self { file, slice }
}
pub fn peek_usize(&self) -> (usize, usize) {
if self[0] & 0x80 == 0 {
(self[0] as usize, 1)
} else if self[0] & 0xC0 == 0x80 {
((((self[0] & 0x3F) as usize) << 8) | self[1] as usize, 2)
} else {
((((self[0] & 0x1F) as usize) << 24) | (self[1] as usize) << 16 | (self[2] as usize) << 8 | self[3] as usize, 4)
}
}
pub fn read_usize(&mut self) -> usize {
let (value, offset) = self.peek_usize();
self.offset(offset);
value
}
pub fn read_expected(&mut self, expected: usize) -> bool {
let (value, offset) = self.peek_usize();
if value == expected {
self.offset(offset);
true
} else {
false
}
}
pub fn read_modifiers(&mut self) -> Vec<TypeDefOrRef> {
let mut mods = vec![];
loop {
let (value, offset) = self.peek_usize();
if value != 32 && value != 31 {
break;
} else {
self.offset(offset);
mods.push(TypeDefOrRef::decode(self.file, self.read_usize()))
}
}
mods
}
pub fn read_str(&mut self) -> &str {
let len = self.read_usize();
let value = unsafe { std::str::from_utf8_unchecked(&self.slice[..len]) };
self.offset(len);
value
}
pub fn read_string(self) -> String {
let slice = self.slice;
if slice.as_ptr().align_offset(std::mem::align_of::<u16>()) > 0 {
let slice = slice.chunks_exact(2).take(slice.len() / 2).map(|chunk| u16::from_le_bytes(chunk.try_into().unwrap())).collect::<Vec<u16>>();
String::from_utf16_lossy(&slice)
} else {
let slice = unsafe { std::slice::from_raw_parts(slice.as_ptr() as *const u16, slice.len() / 2) };
String::from_utf16_lossy(slice)
}
}
pub fn read_bool(&mut self) -> bool {
// A bool is specified as "a single byte with value 0 (false) or 1 (true)".
match self.read_u8() {
0 => false,
1 => true,
_ => panic!("Illegal bool value"),
}
}
pub fn read_i8(&mut self) -> i8 {
let value = i8::from_le_bytes(self[..1].try_into().unwrap());
self.offset(1);
value
}
pub fn read_u8(&mut self) -> u8 {
let value = u8::from_le_bytes(self[..1].try_into().unwrap());
self.offset(1);
value
}
pub fn read_i16(&mut self) -> i16 {
let value = i16::from_le_bytes(self[..2].try_into().unwrap());
self.offset(2);
value
}
pub fn read_u16(&mut self) -> u16 {
let value = u16::from_le_bytes(self[..2].try_into().unwrap());
self.offset(2);
value
}
pub fn read_i32(&mut self) -> i32 {
let value = i32::from_le_bytes(self[..4].try_into().unwrap());
self.offset(4);
value
}
pub fn read_u32(&mut self) -> u32 {
let value = u32::from_le_bytes(self[..4].try_into().unwrap());
self.offset(4);
value
}
pub fn read_i64(&mut self) -> i64 {
let value = i64::from_le_bytes(self[..8].try_into().unwrap());
self.offset(8);
value
}
pub fn read_u64(&mut self) -> u64 {
let value = u64::from_le_bytes(self[..8].try_into().unwrap());
self.offset(8);
value
}
pub fn read_f32(&mut self) -> f32 {
let value = f32::from_le_bytes(self[..4].try_into().unwrap());
self.offset(4);
value
}
pub fn read_f64(&mut self) -> f64 {
let value = f64::from_le_bytes(self[..8].try_into().unwrap());
self.offset(8);
value
}
pub fn read_integer(&mut self, ty: Type) -> Integer {
match ty {
Type::I8 => Integer::I8(self.read_i8()),
Type::U8 => Integer::U8(self.read_u8()),
Type::I16 => Integer::I16(self.read_i16()),
Type::U16 => Integer::U16(self.read_u16()),
Type::I32 => Integer::I32(self.read_i32()),
Type::U32 => Integer::U32(self.read_u32()),
Type::I64 => Integer::I64(self.read_i64()),
Type::U64 => Integer::U64(self.read_u64()),
_ => panic!("Type is not an integer"),
}
}
fn offset(&mut self, offset: usize) {
self.slice = &self.slice[offset..];
}
}
|
