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|
/*!
The `ToBytes` and `IterBytes` traits
*/
// NB: transitionary, de-mode-ing.
#[forbid(deprecated_mode)];
#[forbid(deprecated_pattern)];
use io::Writer;
pub type Cb = fn(buf: &[const u8]) -> bool;
/**
* A trait to implement in order to make a type hashable;
* This works in combination with the trait `Hash::Hash`, and
* may in the future be merged with that trait or otherwise
* modified when default methods and trait inheritence are
* completed.
*/
pub trait IterBytes {
/**
* Call the provided callback `f` one or more times with
* byte-slices that should be used when computing a hash
* value or otherwise "flattening" the structure into
* a sequence of bytes. The `lsb0` parameter conveys
* whether the caller is asking for little-endian bytes
* (`true`) or big-endian (`false`); this should only be
* relevant in implementations that represent a single
* multi-byte datum such as a 32 bit integer or 64 bit
* floating-point value. It can be safely ignored for
* larger structured types as they are usually processed
* left-to-right in declaration order, regardless of
* underlying memory endianness.
*/
pure fn iter_bytes(&self, lsb0: bool, f: Cb);
}
impl bool: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, _lsb0: bool, f: Cb) {
f([
*self as u8
]);
}
}
impl u8: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, _lsb0: bool, f: Cb) {
f([
*self
]);
}
}
impl u16: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
if lsb0 {
f([
*self as u8,
(*self >> 8) as u8
]);
} else {
f([
(*self >> 8) as u8,
*self as u8
]);
}
}
}
impl u32: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
if lsb0 {
f([
*self as u8,
(*self >> 8) as u8,
(*self >> 16) as u8,
(*self >> 24) as u8,
]);
} else {
f([
(*self >> 24) as u8,
(*self >> 16) as u8,
(*self >> 8) as u8,
*self as u8
]);
}
}
}
impl u64: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
if lsb0 {
f([
*self as u8,
(*self >> 8) as u8,
(*self >> 16) as u8,
(*self >> 24) as u8,
(*self >> 32) as u8,
(*self >> 40) as u8,
(*self >> 48) as u8,
(*self >> 56) as u8
]);
} else {
f([
(*self >> 56) as u8,
(*self >> 48) as u8,
(*self >> 40) as u8,
(*self >> 32) as u8,
(*self >> 24) as u8,
(*self >> 16) as u8,
(*self >> 8) as u8,
*self as u8
]);
}
}
}
impl i8: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as u8).iter_bytes(lsb0, f)
}
}
impl i16: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as u16).iter_bytes(lsb0, f)
}
}
impl i32: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as u32).iter_bytes(lsb0, f)
}
}
impl i64: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as u64).iter_bytes(lsb0, f)
}
}
impl char: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as u32).iter_bytes(lsb0, f)
}
}
#[cfg(target_word_size = "32")]
pub mod x32 {
pub impl uint: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as u32).iter_bytes(lsb0, f)
}
}
}
#[cfg(target_word_size = "64")]
pub mod x64 {
pub impl uint: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as u64).iter_bytes(lsb0, f)
}
}
}
impl int: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as uint).iter_bytes(lsb0, f)
}
}
impl<A: IterBytes> &[A]: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
for (*self).each |elt| {
do elt.iter_bytes(lsb0) |bytes| {
f(bytes)
}
}
}
}
impl<A: IterBytes, B: IterBytes> (A,B): IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
let &(ref a, ref b) = self;
a.iter_bytes(lsb0, f);
b.iter_bytes(lsb0, f);
}
}
impl<A: IterBytes, B: IterBytes, C: IterBytes> (A,B,C): IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
let &(ref a, ref b, ref c) = self;
a.iter_bytes(lsb0, f);
b.iter_bytes(lsb0, f);
c.iter_bytes(lsb0, f);
}
}
// Move this to vec, probably.
pure fn borrow<A>(a: &x/[A]) -> &x/[A] {
a
}
impl<A: IterBytes> ~[A]: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
borrow(*self).iter_bytes(lsb0, f)
}
}
impl<A: IterBytes> @[A]: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
borrow(*self).iter_bytes(lsb0, f)
}
}
pub pure fn iter_bytes_2<A: IterBytes, B: IterBytes>(a: &A, b: &B,
lsb0: bool, z: Cb) {
let mut flag = true;
a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
}
pub pure fn iter_bytes_3<A: IterBytes,
B: IterBytes,
C: IterBytes>(a: &A, b: &B, c: &C,
lsb0: bool, z: Cb) {
let mut flag = true;
a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
}
pub pure fn iter_bytes_4<A: IterBytes,
B: IterBytes,
C: IterBytes,
D: IterBytes>(a: &A, b: &B, c: &C,
d: &D,
lsb0: bool, z: Cb) {
let mut flag = true;
a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
}
pub pure fn iter_bytes_5<A: IterBytes,
B: IterBytes,
C: IterBytes,
D: IterBytes,
E: IterBytes>(a: &A, b: &B, c: &C,
d: &D, e: &E,
lsb0: bool, z: Cb) {
let mut flag = true;
a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
e.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
}
pub pure fn iter_bytes_6<A: IterBytes,
B: IterBytes,
C: IterBytes,
D: IterBytes,
E: IterBytes,
F: IterBytes>(a: &A, b: &B, c: &C,
d: &D, e: &E, f: &F,
lsb0: bool, z: Cb) {
let mut flag = true;
a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
e.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
f.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
}
pub pure fn iter_bytes_7<A: IterBytes,
B: IterBytes,
C: IterBytes,
D: IterBytes,
E: IterBytes,
F: IterBytes,
G: IterBytes>(a: &A, b: &B, c: &C,
d: &D, e: &E, f: &F,
g: &G,
lsb0: bool, z: Cb) {
let mut flag = true;
a.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
b.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
c.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
d.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
e.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
f.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
if !flag { return; }
g.iter_bytes(lsb0, |bytes| {flag = z(bytes); flag});
}
impl &str: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, _lsb0: bool, f: Cb) {
do str::byte_slice(*self) |bytes| {
f(bytes);
}
}
}
impl ~str: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, _lsb0: bool, f: Cb) {
do str::byte_slice(*self) |bytes| {
f(bytes);
}
}
}
impl @str: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, _lsb0: bool, f: Cb) {
do str::byte_slice(*self) |bytes| {
f(bytes);
}
}
}
impl<A: IterBytes> Option<A>: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
match *self {
Some(ref a) => iter_bytes_2(&0u8, a, lsb0, f),
None => 1u8.iter_bytes(lsb0, f)
}
}
}
impl<A: IterBytes> &A: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(**self).iter_bytes(lsb0, f);
}
}
impl<A: IterBytes> @A: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(**self).iter_bytes(lsb0, f);
}
}
impl<A: IterBytes> ~A: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(**self).iter_bytes(lsb0, f);
}
}
// NB: raw-pointer IterBytes does _not_ dereference
// to the target; it just gives you the pointer-bytes.
impl<A> *const A: IterBytes {
#[inline(always)]
pure fn iter_bytes(&self, lsb0: bool, f: Cb) {
(*self as uint).iter_bytes(lsb0, f);
}
}
trait ToBytes {
fn to_bytes(&self, lsb0: bool) -> ~[u8];
}
impl<A: IterBytes> A: ToBytes {
fn to_bytes(&self, lsb0: bool) -> ~[u8] {
do io::with_bytes_writer |wr| {
for self.iter_bytes(lsb0) |bytes| {
wr.write(bytes)
}
}
}
}
|
