62 lines
2.1 KiB
Rust
62 lines
2.1 KiB
Rust
//! Binary data conversion utilities.
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use crate::durandal::err::*;
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pub type Ident = [u8; 4];
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pub trait BinUtil
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{
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// Checked
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fn c_iden(&self, i: usize) -> ResultS<Ident>;
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fn c_u32b(&self, i: usize) -> ResultS<u32>;
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fn c_u16b(&self, i: usize) -> ResultS<u16>;
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fn c_i32b(&self, i: usize) -> ResultS<i32>
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{match self.c_u32b(i) {Ok(n) => Ok(n as i32), Err(e) => Err(e)}}
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fn c_i16b(&self, i: usize) -> ResultS<i16>
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{match self.c_u16b(i) {Ok(n) => Ok(n as i16), Err(e) => Err(e)}}
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// Optional
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fn o_iden(&self, i: usize) -> Option<Ident> {self.c_iden(i).ok()}
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fn o_u32b(&self, i: usize) -> Option<u32> {self.c_u32b(i).ok()}
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fn o_u16b(&self, i: usize) -> Option<u16> {self.c_u16b(i).ok()}
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fn o_i32b(&self, i: usize) -> Option<i32> {self.c_i32b(i).ok()}
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fn o_i16b(&self, i: usize) -> Option<i16> {self.c_i16b(i).ok()}
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// Unchecked
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fn b_iden(&self, i: usize) -> Ident {self.c_iden(i).unwrap()}
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fn b_u32b(&self, i: usize) -> u32 {self.c_u32b(i).unwrap()}
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fn b_u16b(&self, i: usize) -> u16 {self.c_u16b(i).unwrap()}
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fn b_i32b(&self, i: usize) -> i32 {self.c_i32b(i).unwrap()}
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fn b_i16b(&self, i: usize) -> i16 {self.c_i16b(i).unwrap()}
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}
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impl BinUtil for [u8]
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{
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fn c_iden(&self, i: usize) -> ResultS<Ident>
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{
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if i + 3 >= self.len() {return err_msg("not enough data")}
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Ok([self[i], self[i+1], self[i+2], self[i+3]])
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}
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fn c_u32b(&self, i: usize) -> ResultS<u32>
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{
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if i + 3 >= self.len() {return err_msg("not enough data")}
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Ok(u32::from_be_bytes([self[i], self[i+1], self[i+2], self[i+3]]))
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}
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fn c_u16b(&self, i: usize) -> ResultS<u16>
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{
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if i + 1 >= self.len() {return err_msg("not enough data")}
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Ok(u16::from_be_bytes([self[i], self[i+1]]))
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}
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}
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pub fn d_u32b(n: u32) -> [u8; 4] {[(n >> 24) as u8, (n >> 16) as u8,
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(n >> 8) as u8, (n >> 0) as u8]}
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pub fn d_u16b(n: u16) -> [u8; 2] {[(n >> 8) as u8, (n >> 0) as u8]}
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pub fn d_i32b(n: i32) -> [u8; 4] {d_u32b(n as u32)}
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pub fn d_i16b(n: i16) -> [u8; 2] {d_u16b(n as u16)}
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// EOF
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