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attempt to detect endianness in bytes_to_u32_vec

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This commit is contained in:
colin 2018-12-07 10:04:55 -06:00
parent 8c2424c836
commit cc21817445
1 changed files with 17 additions and 2 deletions
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19
examples/src/lib.rs
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@ -36,7 +36,7 @@ use ash::extensions::khr::Win32Surface;
use ash::extensions::mvk::MacOSSurface; use ash::extensions::mvk::MacOSSurface;
pub use ash::version::{DeviceV1_0, EntryV1_0, InstanceV1_0}; pub use ash::version::{DeviceV1_0, EntryV1_0, InstanceV1_0};
use ash::{vk, Device, Entry, Instance}; use ash::{vk, Device, Entry, Instance};
use byteorder::{LittleEndian, ReadBytesExt}; use byteorder::{LittleEndian, BigEndian, ReadBytesExt};
use std::cell::RefCell; use std::cell::RefCell;
use std::default::Default; use std::default::Default;
use std::ffi::{CStr, CString}; use std::ffi::{CStr, CString};
@ -45,14 +45,29 @@ use std::ops::Drop;
use std::os::raw::{c_char, c_void}; use std::os::raw::{c_char, c_void};
use std::ptr; use std::ptr;
const MAGIC_NUMBER: u32 = 0x07230203;
fn spirv_is_little_endian(bytes: &[u8] ) -> bool {
let buffer: [u8;4] = [bytes[0], bytes[1],bytes[2],bytes[3]];
let number : u32 = Cursor::new(buffer).read_u32::<LittleEndian>().unwrap();
number == MAGIC_NUMBER
}
pub fn bytes_to_u32_vec(bytes: &[u8]) -> Vec<u32> { pub fn bytes_to_u32_vec(bytes: &[u8]) -> Vec<u32> {
let mut output = vec![]; let mut output = vec![];
let mut buffer: [u8; 4] = [0, 0, 0, 0]; let mut buffer: [u8; 4] = [0, 0, 0, 0];
let is_little_endian = spirv_is_little_endian(bytes);
for (i, b) in bytes.iter().enumerate() { for (i, b) in bytes.iter().enumerate() {
let idx = i % 4; let idx = i % 4;
buffer[idx] = *b; buffer[idx] = *b;
if idx == 3 { if idx == 3 {
output.push(Cursor::new(buffer).read_u32::<LittleEndian>().unwrap()); let new_word = if is_little_endian {
Cursor::new(buffer).read_u32::<LittleEndian>().unwrap()
} else {
Cursor::new(buffer).read_u32::<BigEndian>().unwrap()
};
output.push(new_word);
buffer = [0, 0, 0, 0]; buffer = [0, 0, 0, 0];
} }
} }