foyer_common/
buf.rs

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//  Copyright 2024 foyer Project Authors
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

use bytes::{Buf, BufMut};

/// Extend [`Buf`] with `get_isize()` and `get_usize()`.
pub trait BufExt: Buf {
    // TODO(MrCroxx): Use `cfg_match` after stable.
    // cfg_match! {
    //     cfg(target_pointer_width = "16") => {
    //         fn get_usize(&mut self) -> usize {
    //             self.get_u16() as usize
    //         }

    //         fn get_isize(&mut self) -> isize {
    //             self.get_i16() as isize
    //         }
    //     }
    //     cfg(target_pointer_width = "32") => {
    //         fn get_usize(&mut self) -> usize {
    //             self.get_u32() as usize
    //         }

    //         fn get_isize(&mut self) -> isize {
    //             self.get_i32() as isize
    //         }
    //     }
    //     cfg(target_pointer_width = "64") => {
    //         fn get_usize(&mut self) -> usize {
    //             self.get_u64() as usize
    //         }

    //         fn get_isize(&mut self) -> isize {
    //             self.get_i64() as isize
    //         }
    //     }
    // }
    cfg_if::cfg_if! {
        if #[cfg(target_pointer_width = "16")] {
            /// Gets an usize from self in big-endian byte order and advance the current position.
            fn get_usize(&mut self) -> usize {
                self.get_u16() as usize
            }
            /// Gets an isize from self in big-endian byte order and advance the current position.
            fn get_isize(&mut self) -> isize {
                self.get_i16() as isize
            }
        }
        else if #[cfg(target_pointer_width = "32")] {
            /// Gets an usize from self in big-endian byte order and advance the current position.
            fn get_usize(&mut self) -> usize {
                self.get_u32() as usize
            }
            /// Gets an isize from self in big-endian byte order and advance the current position.
            fn get_isize(&mut self) -> isize {
                self.get_i32() as isize
            }
        }
        else if #[cfg(target_pointer_width = "64")] {
            /// Gets an usize from self in big-endian byte order and advance the current position.
            fn get_usize(&mut self) -> usize {
                self.get_u64() as usize
            }
            /// Gets an isize from self in big-endian byte order and advance the current position.
            fn get_isize(&mut self) -> isize {
                self.get_i64() as isize
            }
        }
    }
}

impl<T: Buf> BufExt for T {}

/// Extend [`BufMut`] with `put_isize()` and `put_usize()`.
pub trait BufMutExt: BufMut {
    // TODO(MrCroxx): Use `cfg_match` after stable.
    // cfg_match! {
    //     cfg(target_pointer_width = "16") => {
    //         fn put_usize(&mut self, v: usize) {
    //             self.put_u16(v as u16);
    //         }

    //         fn put_isize(&mut self, v: isize) {
    //             self.put_i16(v as i16);
    //         }
    //     }
    //     cfg(target_pointer_width = "32") => {
    //         fn put_usize(&mut self, v: usize) {
    //             self.put_u32(v as u32);
    //         }

    //         fn put_isize(&mut self, v: isize) {
    //             self.put_i32(v as i32);
    //         }
    //     }
    //     cfg(target_pointer_width = "64") => {
    //         fn put_usize(&mut self, v: usize) {
    //             self.put_u64(v as u64);
    //         }

    //         fn put_isize(&mut self, v: isize) {
    //             self.put_i64(v as i64);
    //         }
    //     }
    // }
    cfg_if::cfg_if! {
        if #[cfg(target_pointer_width = "16")] {
            /// Writes an usize to self in the big-endian byte order and advance the current position.
            fn put_usize(&mut self, v: usize) {
                self.put_u16(v as u16);
            }
            /// Writes an usize to self in the big-endian byte order and advance the current position.
            fn put_isize(&mut self, v: isize) {
                self.put_i16(v as i16);
            }
        }
        else if #[cfg(target_pointer_width = "32")] {
            /// Writes an usize to self in the big-endian byte order and advance the current position.
            fn put_usize(&mut self, v: usize) {
                self.put_u32(v as u32);
            }
            /// Writes an usize to self in the big-endian byte order and advance the current position.
            fn put_isize(&mut self, v: isize) {
                self.put_i32(v as i32);
            }
        }
        else if #[cfg(target_pointer_width = "64")] {
            /// Writes an usize to self in the big-endian byte order and advance the current position.
            fn put_usize(&mut self, v: usize) {
                self.put_u64(v as u64);
            }
            /// Writes an usize to self in the big-endian byte order and advance the current position.
            fn put_isize(&mut self, v: isize) {
                self.put_i64(v as i64);
            }
        }
    }
}

impl<T: BufMut> BufMutExt for T {}