dtb 0.2.0

Device tree blob manipulation
Documentation 
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use core::mem::align_of;

use super::common::*;

pub const DTB_MAGIC: u32 = 0xD00D_FEED;
pub const COMP_VERSION: u32 = 16;

pub const TOK_BEGIN_NODE: u32 = 1;
pub const TOK_END_NODE: u32 = 2;
pub const TOK_PROPERTY: u32 = 3;
pub const TOK_NOP: u32 = 4;
pub const TOK_END: u32 = 9;

#[repr(C)]
pub struct Header {
    pub magic: u32,
    pub total_size: u32,
    pub struct_offset: u32,
    pub strings_offset: u32,
    pub reserved_mem_offset: u32,
    pub version: u32,
    pub last_comp_version: u32,
    pub bsp_cpu_id: u32,
    pub strings_size: u32,
    pub struct_size: u32,
}

#[repr(C)]
pub struct PropertyDesc {
    pub value_size: u32,
    pub name_offset: u32,
}

pub fn align_buf<'a, T>(buf: &'a mut [u8]) -> Result<&'a mut [u8]> {
    let off = buf.as_ptr() as usize % align_of::<T>();
    if off == 0 {
        return Ok(buf);
    }

    let inc = align_of::<T>() - off;
    if buf.len() < inc {
        return Err(Error::BufferTooSmall);
    }

    Ok(&mut buf[inc..])
}

#[cfg(test)]
#[macro_use]
mod tests {
    #[macro_export]
    macro_rules! aligned_buf {
        ($name:ident, $array:expr) => {
            let mut tmp = $array;
            #[allow(unused_mut)]
            let mut $name = unsafe {
                core::slice::from_raw_parts_mut::<u8>(
                    tmp.as_mut_ptr() as *mut u8,
                    core::mem::size_of_val(&tmp),
                )
            };
        };
    }
}