436 lines
11 KiB
Rust
436 lines
11 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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/*!
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The `ToBytes` and `IterBytes` traits
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*/
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use io;
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use io::Writer;
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use option::{None, Option, Some};
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use str;
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pub type Cb<'self> = &'self fn(buf: &const [u8]) -> bool;
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/**
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* A trait to implement in order to make a type hashable;
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* This works in combination with the trait `Hash::Hash`, and
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* may in the future be merged with that trait or otherwise
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* modified when default methods and trait inheritence are
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* completed.
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*/
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pub trait IterBytes {
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/**
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* Call the provided callback `f` one or more times with
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* byte-slices that should be used when computing a hash
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* value or otherwise "flattening" the structure into
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* a sequence of bytes. The `lsb0` parameter conveys
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* whether the caller is asking for little-endian bytes
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* (`true`) or big-endian (`false`); this should only be
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* relevant in implementations that represent a single
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* multi-byte datum such as a 32 bit integer or 64 bit
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* floating-point value. It can be safely ignored for
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* larger structured types as they are usually processed
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* left-to-right in declaration order, regardless of
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* underlying memory endianness.
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*/
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fn iter_bytes(&self, lsb0: bool, f: Cb);
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}
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impl IterBytes for bool {
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#[inline(always)]
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fn iter_bytes(&self, _lsb0: bool, f: Cb) {
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f([
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*self as u8
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]);
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}
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}
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impl IterBytes for u8 {
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#[inline(always)]
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fn iter_bytes(&self, _lsb0: bool, f: Cb) {
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f([
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*self
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]);
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}
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}
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impl IterBytes for u16 {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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if lsb0 {
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f([
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*self as u8,
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(*self >> 8) as u8
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]);
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} else {
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f([
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(*self >> 8) as u8,
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*self as u8
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]);
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}
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}
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}
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impl IterBytes for u32 {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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if lsb0 {
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f([
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*self as u8,
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(*self >> 8) as u8,
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(*self >> 16) as u8,
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(*self >> 24) as u8,
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]);
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} else {
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f([
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(*self >> 24) as u8,
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(*self >> 16) as u8,
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(*self >> 8) as u8,
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*self as u8
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]);
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}
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}
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}
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impl IterBytes for u64 {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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if lsb0 {
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f([
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*self as u8,
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(*self >> 8) as u8,
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(*self >> 16) as u8,
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(*self >> 24) as u8,
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(*self >> 32) as u8,
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(*self >> 40) as u8,
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(*self >> 48) as u8,
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(*self >> 56) as u8
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]);
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} else {
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f([
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(*self >> 56) as u8,
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(*self >> 48) as u8,
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(*self >> 40) as u8,
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(*self >> 32) as u8,
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(*self >> 24) as u8,
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(*self >> 16) as u8,
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(*self >> 8) as u8,
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*self as u8
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]);
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}
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}
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}
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impl IterBytes for i8 {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as u8).iter_bytes(lsb0, f)
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}
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}
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impl IterBytes for i16 {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as u16).iter_bytes(lsb0, f)
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}
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}
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impl IterBytes for i32 {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as u32).iter_bytes(lsb0, f)
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}
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}
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impl IterBytes for i64 {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as u64).iter_bytes(lsb0, f)
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}
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}
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impl IterBytes for char {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as u32).iter_bytes(lsb0, f)
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}
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}
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#[cfg(target_word_size = "32")]
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pub mod x32 {
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use to_bytes::{Cb, IterBytes};
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impl IterBytes for uint {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as u32).iter_bytes(lsb0, f)
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}
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}
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}
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#[cfg(target_word_size = "64")]
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pub mod x64 {
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use to_bytes::{Cb, IterBytes};
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impl IterBytes for uint {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as u64).iter_bytes(lsb0, f)
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}
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}
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}
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impl IterBytes for int {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as uint).iter_bytes(lsb0, f)
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}
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}
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impl<'self,A:IterBytes> IterBytes for &'self [A] {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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for (*self).each |elt| {
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do elt.iter_bytes(lsb0) |bytes| {
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f(bytes)
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}
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}
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}
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}
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impl<A:IterBytes,B:IterBytes> IterBytes for (A,B) {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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match *self {
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(ref a, ref b) => {
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iter_bytes_2(a, b, lsb0, f);
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}
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}
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}
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}
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impl<A:IterBytes,B:IterBytes,C:IterBytes> IterBytes for (A,B,C) {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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match *self {
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(ref a, ref b, ref c) => {
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iter_bytes_3(a, b, c, lsb0, f);
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}
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}
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}
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}
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// Move this to vec, probably.
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fn borrow<'x,A>(a: &'x [A]) -> &'x [A] {
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a
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}
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impl<A:IterBytes> IterBytes for ~[A] {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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borrow(*self).iter_bytes(lsb0, f)
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}
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}
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impl<A:IterBytes> IterBytes for @[A] {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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borrow(*self).iter_bytes(lsb0, f)
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}
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}
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pub fn iter_bytes_2<A:IterBytes,B:IterBytes>(a: &A, b: &B,
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lsb0: bool, z: Cb) {
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let mut flag = true;
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a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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}
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pub fn iter_bytes_3<A: IterBytes,
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B: IterBytes,
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C: IterBytes>(a: &A, b: &B, c: &C,
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lsb0: bool, z: Cb) {
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let mut flag = true;
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a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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}
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pub fn iter_bytes_4<A: IterBytes,
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B: IterBytes,
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C: IterBytes,
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D: IterBytes>(a: &A, b: &B, c: &C,
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d: &D,
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lsb0: bool, z: Cb) {
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let mut flag = true;
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a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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}
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pub fn iter_bytes_5<A: IterBytes,
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B: IterBytes,
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C: IterBytes,
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D: IterBytes,
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E: IterBytes>(a: &A, b: &B, c: &C,
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d: &D, e: &E,
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lsb0: bool, z: Cb) {
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let mut flag = true;
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a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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e.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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}
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pub fn iter_bytes_6<A: IterBytes,
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B: IterBytes,
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C: IterBytes,
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D: IterBytes,
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E: IterBytes,
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F: IterBytes>(a: &A, b: &B, c: &C,
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d: &D, e: &E, f: &F,
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lsb0: bool, z: Cb) {
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let mut flag = true;
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a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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e.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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f.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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}
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pub fn iter_bytes_7<A: IterBytes,
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B: IterBytes,
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C: IterBytes,
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D: IterBytes,
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E: IterBytes,
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F: IterBytes,
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G: IterBytes>(a: &A, b: &B, c: &C,
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d: &D, e: &E, f: &F,
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g: &G,
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lsb0: bool, z: Cb) {
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let mut flag = true;
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a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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e.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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f.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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if !flag { return; }
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g.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
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}
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impl<'self> IterBytes for &'self str {
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#[inline(always)]
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fn iter_bytes(&self, _lsb0: bool, f: Cb) {
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do str::byte_slice(*self) |bytes| {
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f(bytes);
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}
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}
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}
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impl IterBytes for ~str {
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#[inline(always)]
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fn iter_bytes(&self, _lsb0: bool, f: Cb) {
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do str::byte_slice(*self) |bytes| {
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f(bytes);
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}
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}
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}
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impl IterBytes for @str {
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#[inline(always)]
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fn iter_bytes(&self, _lsb0: bool, f: Cb) {
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do str::byte_slice(*self) |bytes| {
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f(bytes);
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}
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}
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}
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impl<A:IterBytes> IterBytes for Option<A> {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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match *self {
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Some(ref a) => iter_bytes_2(&0u8, a, lsb0, f),
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None => 1u8.iter_bytes(lsb0, f)
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}
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}
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}
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impl<'self,A:IterBytes> IterBytes for &'self A {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(**self).iter_bytes(lsb0, f);
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}
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}
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impl<A:IterBytes> IterBytes for @A {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(**self).iter_bytes(lsb0, f);
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}
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}
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impl<A:IterBytes> IterBytes for ~A {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(**self).iter_bytes(lsb0, f);
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}
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}
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// NB: raw-pointer IterBytes does _not_ dereference
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// to the target; it just gives you the pointer-bytes.
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impl<A> IterBytes for *const A {
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#[inline(always)]
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fn iter_bytes(&self, lsb0: bool, f: Cb) {
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(*self as uint).iter_bytes(lsb0, f);
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}
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}
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trait ToBytes {
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fn to_bytes(&self, lsb0: bool) -> ~[u8];
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}
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impl<A:IterBytes> ToBytes for A {
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fn to_bytes(&self, lsb0: bool) -> ~[u8] {
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do io::with_bytes_writer |wr| {
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for self.iter_bytes(lsb0) |bytes| {
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wr.write(bytes)
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}
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}
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}
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}
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