//! Pure-Rust codecs for LZMA, LZMA2, and XZ.

#![deny(missing_docs)]

#![deny(missing_debug_implementations)]

#![forbid(unsafe_code)]

#[macro_use]

mod macros;

mod decode;

mod encode;

pub mod error;

mod xz;

use crate::decode::lzbuffer::LzBuffer;

use std::io;

/// Compression helpers.

pub mod compress {

    pub use crate::encode::options::*;

}

/// Decompression helpers.

pub mod decompress {

    pub use crate::decode::options::*;

    #[cfg(feature = "stream")]

    pub use crate::decode::stream::Stream;

}

/// Decompress LZMA data with default [`Options`](decompress/struct.Options.html).

pub fn lzma_decompress<R: io::BufRead, W: io::Write>(

    input: &mut R,

    output: &mut W,

) -> error::Result<()> {

    lzma_decompress_with_options(input, output, &decompress::Options::default())

}

/// Decompress LZMA data with the provided options.

pub fn lzma_decompress_with_options<R: io::BufRead, W: io::Write>(

    input: &mut R,

    output: &mut W,

    options: &decompress::Options,

) -> error::Result<()> {

    let params = decode::lzma::LzmaParams::read_header(input, options)?;

    let mut decoder = if let Some(memlimit) = options.memlimit {

        decode::lzma::new_circular_with_memlimit(output, params, memlimit)?

    } else {

        decode::lzma::new_circular(output, params)?

    };

    let mut rangecoder = decode::rangecoder::RangeDecoder::new(input)

        .map_err(|e| error::Error::LzmaError(format!("LZMA stream too short: {}", e)))?;

    decoder.process(&mut rangecoder)?;

    decoder.output.finish()?;

    Ok(())

}

/// Compresses data with LZMA and default [`Options`](compress/struct.Options.html).

pub fn lzma_compress<R: io::BufRead, W: io::Write>(

    input: &mut R,

    output: &mut W,

) -> io::Result<()> {

    lzma_compress_with_options(input, output, &compress::Options::default())

}

/// Compress LZMA data with the provided options.

pub fn lzma_compress_with_options<R: io::BufRead, W: io::Write>(

    input: &mut R,

    output: &mut W,

    options: &compress::Options,

) -> io::Result<()> {

    let encoder = encode::dumbencoder::Encoder::from_stream(output, options)?;

    encoder.process(input)

}

/// Decompress LZMA2 data with default [`Options`](decompress/struct.Options.html).

pub fn lzma2_decompress<R: io::BufRead, W: io::Write>(

    input: &mut R,

    output: &mut W,

) -> error::Result<()> {

    decode::lzma2::decode_stream(input, output)

}

/// Compress data with LZMA2 and default [`Options`](compress/struct.Options.html).

pub fn lzma2_compress<R: io::BufRead, W: io::Write>(

    input: &mut R,

    output: &mut W,

) -> io::Result<()> {

    encode::lzma2::encode_stream(input, output)

}

/// Decompress XZ data with default [`Options`](decompress/struct.Options.html).

pub fn xz_decompress<R: io::BufRead, W: io::Write>(

    input: &mut R,

    output: &mut W,

) -> error::Result<()> {

    decode::xz::decode_stream(input, output)

}

/// Compress data with XZ and default [`Options`](compress/struct.Options.html).

pub fn xz_compress<R: io::BufRead, W: io::Write>(input: &mut R, output: &mut W) -> io::Result<()> {

    encode::xz::encode_stream(input, output)

}