Make the fuchsia mojo/public repo the source of truth.

mojo/public/rust/src/bindings/encoding.rs

Index: mojo/public/rust/src/bindings/encoding.rs
diff --git a/mojo/public/rust/src/bindings/encoding.rs b/mojo/public/rust/src/bindings/encoding.rs
deleted file mode 100644
index 4e30628983e6392bb95c3acc59f6617cc7859f41..0000000000000000000000000000000000000000
--- a/mojo/public/rust/src/bindings/encoding.rs
+++ /dev/null
@@ -1,402 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-use bindings::mojom::MOJOM_NULL_POINTER;
-use bindings::util;
-
-use std::mem;
-use std::ptr;
-use std::ops::{Add, AddAssign, Sub, Mul, Div, Rem};
-use std::vec::Vec;
-
-use system::UntypedHandle;
-
-/// Represents some count of bits.
-///
-/// Used to distinguish when we have a bit and a byte
-/// count. The byte count will go in a usize, while we
-/// can use this structure to safely count bits without
-/// running into some subtle bugs or crazy errors.
-#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd)]
-pub struct Bits(pub usize);
-
-impl Bits {
-    /// Convert bit representation to bytes, rounding up to the nearest byte.
-    pub fn as_bytes(self) -> usize {
-        util::bits_to_bytes(self.0)
-    }
-
-    /// Convert to a number of bytes plus the number of bits leftover
-    /// that could not fit in a full byte.
-    pub fn as_bits_and_bytes(self) -> (Bits, usize) {
-        (Bits(self.0 & 7), self.0 >> 3)
-    }
-
-    /// Return 1 left-shifted by the amount of bits stored here.
-    ///
-    /// Only guaranteed to work for up to 8 bits.
-    pub fn as_set_bit(self) -> u8 {
-        debug_assert!(self.0 < 8);
-        1 << (self.0 & 7)
-    }
-
-    pub fn checked_mul(self, val: usize) -> Option<Bits> {
-        match val.checked_mul(self.0) {
-            Some(result) => Some(Bits(result)),
-            None => None,
-        }
-    }
-
-    /// Align the bits to some number of bytes.
-    pub fn align_to_bytes(&mut self, bytes: usize) {
-        self.0 = util::align_bytes(self.0, 8 * bytes);
-    }
-}
-
-impl Add for Bits {
-    type Output = Self;
-    fn add(self, rhs: Self) -> Self {
-        Bits(self.0 + rhs.0)
-    }
-}
-
-impl AddAssign for Bits {
-    fn add_assign(&mut self, rhs: Self) {
-        self.0 += rhs.0
-    }
-}
-
-impl Mul<usize> for Bits {
-    type Output = Self;
-    fn mul(self, rhs: usize) -> Self {
-        Bits(self.0 * rhs)
-    }
-}
-
-/// This trait is intended to be used by Mojom primitive values
-/// in order to be identified in generic contexts.
-pub trait MojomNumeric: Copy + Clone + Sized + Add<Self> + Sub<Self, Output=Self> + Mul<Self> +
-    Div<Self, Output=Self> + Rem<Self, Output=Self> + PartialEq<Self> + Default {
-
-/// Converts the primitive to a little-endian representation (the mojom endianness).
-    fn to_mojom_endian(self) -> Self;
-}
-
-macro_rules! impl_mojom_numeric_for_prim {
-    ($($t:ty),*) => {
-        $(
-        impl MojomNumeric for $t {
-            fn to_mojom_endian(self) -> $t { self.to_le() }
-        }
-        )*
-    }
-}
-
-impl_mojom_numeric_for_prim!(i8, i16, i32, i64, u8, u16, u32, u64);
-
-impl MojomNumeric for f32 {
-    fn to_mojom_endian(self) -> f32 {
-        unsafe { mem::transmute::<u32, f32>(mem::transmute::<f32, u32>(self).to_le()) }
-    }
-}
-
-impl MojomNumeric for f64 {
-    fn to_mojom_endian(self) -> f64 {
-        unsafe { mem::transmute::<u64, f64>(mem::transmute::<f64, u64>(self).to_le()) }
-    }
-}
-
-/// Align to the Mojom default of 8 bytes.
-pub fn align_default(bytes: usize) -> usize {
-    util::align_bytes(bytes, 8)
-}
-
-/// The size in bytes of any data header.
-pub const DATA_HEADER_SIZE: usize = 8;
-
-/// A value that goes in the second u32 of a
-/// a data header.
-///
-/// Since the data header can head many types,
-/// this enum represents all the kinds of data
-/// that can end up in a data header.
-#[derive(Clone, Copy)]
-pub enum DataHeaderValue {
-    Elements(u32),
-    Version(u32),
-    UnionTag(u32),
-}
-
-impl DataHeaderValue {
-    /// Get the raw u32 value.
-    fn as_raw(self) -> u32 {
-        match self {
-            DataHeaderValue::Elements(v) => v,
-            DataHeaderValue::Version(v) => v,
-            DataHeaderValue::UnionTag(v) => v,
-        }
-    }
-}
-
-/// A data header is placed at the beginning of every serialized
-/// Mojom object, providing its size as well as some extra meta-data.
-///
-/// The meta-data should always come from a DataHeaderValue.
-pub struct DataHeader {
-    size: u32,
-    data: u32,
-}
-
-impl DataHeader {
-    /// Create a new DataHeader.
-    pub fn new(size: usize, data: DataHeaderValue) -> DataHeader {
-        DataHeader {
-            size: size as u32,
-            data: data.as_raw(),
-        }
-    }
-
-    /// Getter for size.
-    pub fn size(&self) -> u32 {
-        self.size
-    }
-
-    /// Getter for extra meta-data.
-    pub fn data(&self) -> u32 {
-        self.data
-    }
-}
-
-/// This context object represents an encoding/decoding context.
-#[derive(Clone, Default)]
-pub struct Context {
-    /// An index representing an encoding state.
-    id: usize,
-
-    /// Whether or not our current context is directly inside of
-    /// a union.
-    is_union: bool,
-}
-
-impl Context {
-    /// Create a new context with all data default.
-    pub fn new(id: usize) -> Context {
-        Context {
-            id: id,
-            is_union: false,
-        }
-    }
-
-    /// Getter for the encoding state ID.
-    pub fn id(&self) -> usize {
-        self.id
-    }
-
-    /// Getter for whether or not we are in a union.
-    pub fn is_union(&self) -> bool {
-        self.is_union
-    }
-
-    /// Change whether or not we are inside of a union and create that
-    /// as a new context.
-    pub fn set_is_union(&self, value: bool) -> Context {
-        let mut new_context = self.clone();
-        new_context.is_union = value;
-        new_context
-    }
-}
-
-/// An encoding state represents the encoding logic for a single
-/// Mojom object that is NOT inlined, such as a struct or an array.
-pub struct EncodingState<'slice> {
-    /// The buffer the state may write to.
-    data: &'slice mut [u8],
-
-    /// The offset of this serialized object into the overall buffer.
-    global_offset: usize,
-
-    /// The current offset within 'data'.
-    offset: usize,
-
-    /// The current bit offset within 'data'.
-    bit_offset: Bits,
-}
-
-impl<'slice> EncodingState<'slice> {
-    /// Create a new encoding state.
-    ///
-    /// Note: the encoder will not allocate a buffer for you, rather
-    /// a pre-allocated buffer must be passed in.
-    pub fn new(buffer: &'slice mut [u8],
-               header: &DataHeader,
-               offset: usize)
-               -> EncodingState<'slice> {
-        let mut state = EncodingState {
-            data: buffer,
-            global_offset: offset,
-            offset: 0,
-            bit_offset: Bits(0),
-        };
-        state.write(header.size());
-        state.write(header.data());
-        state
-    }
-
-    /// Align the encoding state to the next byte.
-    pub fn align_to_byte(&mut self) {
-        if self.bit_offset > Bits(0) {
-            self.offset += 1;
-            self.bit_offset = Bits(0);
-        }
-    }
-
-    /// Align the encoding state to the next 'bytes' boundary.
-    pub fn align_to_bytes(&mut self, bytes: usize) {
-        self.offset = util::align_bytes(self.offset, bytes);
-    }
-
-    /// Write a primitive into the buffer.
-    fn write<T: MojomNumeric>(&mut self, data: T) {
-        let num_bytes = mem::size_of::<T>();
-        let bytes = data.to_mojom_endian();
-        debug_assert!(num_bytes + self.offset <= self.data.len());
-        unsafe {
-            ptr::copy_nonoverlapping(mem::transmute::<&T, *const u8>(&bytes),
-                                     (&mut self.data[self.offset..]).as_mut_ptr(),
-                                     num_bytes);
-        }
-        self.bit_offset = Bits(0);
-        self.offset += num_bytes;
-    }
-
-    /// Encode a primitive into the buffer, naturally aligning it.
-    pub fn encode<T: MojomNumeric>(&mut self, data: T) {
-        self.align_to_byte();
-        self.align_to_bytes(mem::size_of::<T>());
-        self.write(data);
-    }
-
-    /// Encode a boolean value into the buffer as one bit.
-    pub fn encode_bool(&mut self, data: bool) {
-        let offset = self.offset;
-        if data {
-            self.data[offset] |= self.bit_offset.as_set_bit();
-        }
-        self.bit_offset += Bits(1);
-        let (bits, bytes) = self.bit_offset.as_bits_and_bytes();
-        self.offset += bytes;
-        self.bit_offset = bits;
-    }
-
-    /// Encode a null union into the buffer.
-    pub fn encode_null_union(&mut self) {
-        self.align_to_byte();
-        self.align_to_bytes(8);
-        self.write(0 as u32); // Size
-        self.write(0 as u32); // Tag
-        self.write(0 as u64); // Data
-    }
-
-    /// Encode a null pointer into the buffer.
-    pub fn encode_null_pointer(&mut self) {
-        self.align_to_byte();
-        self.align_to_bytes(8);
-        self.encode(MOJOM_NULL_POINTER);
-    }
-
-    /// Encode a null handle into the buffer.
-    pub fn encode_null_handle(&mut self) {
-        self.align_to_byte();
-        self.align_to_bytes(4);
-        self.encode(-1 as i32);
-    }
-
-    /// Encode a non-null pointer into the buffer.
-    ///
-    /// 'location' is an absolute location in the global buffer, but
-    /// Mojom pointers are offsets relative to the pointer, so we
-    /// perform that conversion here before writing.
-    pub fn encode_pointer(&mut self, location: u64) {
-        self.align_to_byte();
-        self.align_to_bytes(8);
-        let current_location = (self.global_offset + self.offset) as u64;
-        debug_assert!(location >= current_location);
-        self.encode(location - current_location);
-    }
-}
-
-/// A struct that will encode a given Mojom object and convert it into
-/// bytes and a vector of handles.
-pub struct Encoder<'slice> {
-    bytes: usize,
-    buffer: Option<&'slice mut [u8]>,
-    states: Vec<EncodingState<'slice>>,
-    handles: Vec<UntypedHandle>,
-}
-
-impl<'slice> Encoder<'slice> {
-    /// Create a new Encoder.
-    pub fn new(buffer: &'slice mut [u8]) -> Encoder<'slice> {
-        Encoder {
-            bytes: 0,
-            buffer: Some(buffer),
-            states: Vec::new(),
-            handles: Vec::new(),
-        }
-    }
-
-    /// Get the current encoded size (useful for writing pointers).
-    pub fn size(&self) -> usize {
-        self.bytes
-    }
-
-    /// Start encoding a new object with its data header.
-    ///
-    /// Creates a new encoding state for the object.
-    pub fn add(&mut self, header: &DataHeader) -> Option<Context> {
-        let buf = self.buffer.take().unwrap();
-        if buf.len() < (header.size() as usize) {
-            self.buffer = Some(buf);
-            return None;
-        }
-        let obj_bytes = header.size() as usize;
-        let (claimed, rest) = buf.split_at_mut(obj_bytes);
-        self.states.push(EncodingState::new(claimed, header, self.bytes));
-        self.bytes += obj_bytes;
-        let padding_bytes = align_default(obj_bytes) - obj_bytes;
-        if padding_bytes <= rest.len() {
-            let (_, new_buffer) = rest.split_at_mut(padding_bytes);
-            self.bytes += padding_bytes;
-            self.buffer = Some(new_buffer);
-        } else {
-            self.buffer = Some(rest);
-        }
-        Some(Context::new(self.states.len() - 1))
-    }
-
-    /// Adds a handle and returns an offset to that handle in the
-    /// final handle vector.
-    pub fn add_handle(&mut self, handle: UntypedHandle) -> usize {
-        self.handles.push(handle);
-        self.handles.len() - 1
-    }
-
-    /// Immutably borrow an encoding state via Context.
-    pub fn get(&self, context: &Context) -> &EncodingState<'slice> {
-        &self.states[context.id()]
-    }
-
-    /// Mutably borrow an encoding state via Context.
-    pub fn get_mut(&mut self, context: &Context) -> &mut EncodingState<'slice> {
-        &mut self.states[context.id()]
-    }
-
-    /// Signal to finish encoding by destroying the Encoder and returning the final
-    /// handle vector.
-    ///
-    /// Note: No byte buffer is returned as that is pre-allocated.
-    pub fn unwrap(self) -> Vec<UntypedHandle> {
-        self.handles
-    }
-}