preflate-rs 0.6.3

Decompresses existing DEFLATE streams to allow for better compression (eg with ZStandard) while allowing the exact original binary DEFLATE stream to be recreated by detecting the parameters used during compression.
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/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the Apache License, Version 2.0. See LICENSE.txt in the project root for license information.
 *  This software incorporates material from third parties. See NOTICE.txt for details.
 *--------------------------------------------------------------------------------------------*/

#[derive(Clone)]
pub struct PreflateInput<'a> {
    data: &'a [u8],
    pos: i32,
}

impl<'a> PreflateInput<'a> {
    pub fn new(v: &'a [u8]) -> Self {
        PreflateInput { data: v, pos: 0 }
    }

    pub fn pos(&self) -> u32 {
        self.pos as u32
    }

    pub fn size(&self) -> u32 {
        self.data.len() as u32
    }

    pub fn cur_chars(&self, offset: i32) -> &[u8] {
        &self.data[(self.pos + offset) as usize..]
    }

    pub fn cur_char(&self, offset: i32) -> u8 {
        self.data[(self.pos + offset) as usize]
    }

    pub fn advance(&mut self, l: u32) {
        self.pos += l as i32;
        debug_assert!(self.pos <= self.data.len() as i32);
    }

    pub fn remaining(&self) -> u32 {
        self.data.len() as u32 - self.pos as u32
    }
}