mirror of
https://github.com/google/flatbuffers.git
synced 2026-06-03 12:21:23 +00:00
8be05f6bd4
* Cargo clippy lints * more lints * more lints * Restored a doc comment * Comment on float eps-eq and adjusted casting * Rust Flexbuffers * more serde tests, removed some unsafe * Redid serde to be map-like and Reader is Display * Moved iter from Reader to VectorReader * Serious quickcheck + bugs * wvo api * Made types smaller for a reasonable speedup * redid reading in a way that's a bit faster. Profiling shows the rust slowdown as building +10%, reading +20% * src/bin are developer binaries in rust * Root and Map width are not packed * key null check is debug only + doc changes * BuilderOptions * Documentation * Documentation * Moved tests to rust_usage_test * Moved rust flexbuffers samples to Flatbuffers/samples * Fixed RustTest * Fixed for Rust 1.37.0 * Upgraded to rust 1_40_0 * fixed a little-endian-only feature in a test * 1.40.0 * fixed some benchmarks for bigendian * Updated .bat file * misspelling * Gold Flexbuffer test. * Serialize,Deserialize, std::error::Error for Errors. * Undo rustfmt in integration_test.rs * from_slice instead of from_vec * Added comments to unsafe blocks * expanded on comment * bump Co-authored-by: CasperN <cneo@google.com>
114 lines
3.0 KiB
Rust
114 lines
3.0 KiB
Rust
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use crate::bitwidth::BitWidth::*;
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use std::slice::Iter;
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/// Represents the size of Flexbuffers data.
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///
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/// Flexbuffers automatically compresses numbers to the smallest possible width
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/// (`250u64` is stored as `250u8`).
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#[derive(
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Debug,
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Clone,
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Copy,
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PartialEq,
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Eq,
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PartialOrd,
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Serialize,
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Deserialize,
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Ord,
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num_enum::TryFromPrimitive,
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)]
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#[repr(u8)]
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pub enum BitWidth {
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W8 = 0,
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W16 = 1,
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W32 = 2,
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W64 = 3,
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}
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impl BitWidth {
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pub(crate) fn iter() -> Iter<'static, Self> {
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[W8, W16, W32, W64].iter()
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}
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pub fn n_bytes(self) -> usize {
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1 << self as usize
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}
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pub fn from_nbytes(n: impl std::convert::Into<usize>) -> Option<Self> {
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match n.into() {
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1 => Some(W8),
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2 => Some(W16),
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4 => Some(W32),
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8 => Some(W64),
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_ => None,
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}
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}
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}
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impl Default for BitWidth {
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fn default() -> Self {
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W8
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}
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}
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// TODO(cneo): Overloading with `from` is probably not the most readable idea in hindsight.
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macro_rules! impl_bitwidth_from {
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($from: ident, $w64: ident, $w32: ident, $w16: ident, $w8: ident) => {
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impl From<$from> for BitWidth {
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fn from(x: $from) -> BitWidth {
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let x = x as $w64;
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if x >= $w8::min_value() as $w64 && x <= $w8::max_value() as $w64 {
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return W8;
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}
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if x >= $w16::min_value() as $w64 && x <= $w16::max_value() as $w64 {
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return W16;
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}
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if x >= $w32::min_value() as $w64 && x <= $w32::max_value() as $w64 {
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return W32;
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}
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W64
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}
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}
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};
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}
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impl_bitwidth_from!(u64, u64, u32, u16, u8);
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impl_bitwidth_from!(usize, u64, u32, u16, u8);
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impl_bitwidth_from!(i64, i64, i32, i16, i8);
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#[allow(clippy::float_cmp)]
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impl From<f64> for BitWidth {
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fn from(x: f64) -> BitWidth {
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if x != x as f32 as f64 {
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W64
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} else {
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W32
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}
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}
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}
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impl From<f32> for BitWidth {
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fn from(_: f32) -> BitWidth {
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W32
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}
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}
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/// Zero pad `v` until `T` will be byte aligned when pushed.
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pub fn align(buffer: &mut Vec<u8>, width: BitWidth) {
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let bytes = 1 << width as u8;
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let alignment = (bytes - buffer.len() % bytes) % bytes;
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// Profiling reveals the loop is faster than Vec::resize.
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for _ in 0..alignment as usize {
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buffer.push(0);
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}
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}
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