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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use deno_core::op2;
use flate2::write::DeflateDecoder;
use flate2::write::DeflateEncoder;
use flate2::write::GzDecoder;
use flate2::write::GzEncoder;
use flate2::write::ZlibDecoder;
use flate2::write::ZlibEncoder;
use flate2::Compression;
use std::cell::RefCell;
use std::io::Write;
#[derive(Debug, thiserror::Error)]
pub enum CompressionError {
#[error("Unsupported format")]
UnsupportedFormat,
#[error("resource is closed")]
ResourceClosed,
#[error(transparent)]
IoTypeError(std::io::Error),
#[error(transparent)]
Io(std::io::Error),
}
#[derive(Debug)]
struct CompressionResource(RefCell<Option<Inner>>);
impl deno_core::GarbageCollected for CompressionResource {}
/// https://wicg.github.io/compression/#supported-formats
#[derive(Debug)]
enum Inner {
DeflateDecoder(ZlibDecoder<Vec<u8>>),
DeflateEncoder(ZlibEncoder<Vec<u8>>),
DeflateRawDecoder(DeflateDecoder<Vec<u8>>),
DeflateRawEncoder(DeflateEncoder<Vec<u8>>),
GzDecoder(GzDecoder<Vec<u8>>),
GzEncoder(GzEncoder<Vec<u8>>),
}
#[op2]
#[cppgc]
pub fn op_compression_new(
#[string] format: &str,
is_decoder: bool,
) -> Result<CompressionResource, CompressionError> {
let w = Vec::new();
let inner = match (format, is_decoder) {
("deflate", true) => Inner::DeflateDecoder(ZlibDecoder::new(w)),
("deflate", false) => {
Inner::DeflateEncoder(ZlibEncoder::new(w, Compression::default()))
}
("deflate-raw", true) => Inner::DeflateRawDecoder(DeflateDecoder::new(w)),
("deflate-raw", false) => {
Inner::DeflateRawEncoder(DeflateEncoder::new(w, Compression::default()))
}
("gzip", true) => Inner::GzDecoder(GzDecoder::new(w)),
("gzip", false) => {
Inner::GzEncoder(GzEncoder::new(w, Compression::default()))
}
_ => return Err(CompressionError::UnsupportedFormat),
};
Ok(CompressionResource(RefCell::new(Some(inner))))
}
#[op2]
#[buffer]
pub fn op_compression_write(
#[cppgc] resource: &CompressionResource,
#[anybuffer] input: &[u8],
) -> Result<Vec<u8>, CompressionError> {
let mut inner = resource.0.borrow_mut();
let inner = inner.as_mut().ok_or(CompressionError::ResourceClosed)?;
let out: Vec<u8> = match &mut *inner {
Inner::DeflateDecoder(d) => {
d.write_all(input).map_err(CompressionError::IoTypeError)?;
d.flush().map_err(CompressionError::Io)?;
d.get_mut().drain(..)
}
Inner::DeflateEncoder(d) => {
d.write_all(input).map_err(CompressionError::IoTypeError)?;
d.flush().map_err(CompressionError::Io)?;
d.get_mut().drain(..)
}
Inner::DeflateRawDecoder(d) => {
d.write_all(input).map_err(CompressionError::IoTypeError)?;
d.flush().map_err(CompressionError::Io)?;
d.get_mut().drain(..)
}
Inner::DeflateRawEncoder(d) => {
d.write_all(input).map_err(CompressionError::IoTypeError)?;
d.flush().map_err(CompressionError::Io)?;
d.get_mut().drain(..)
}
Inner::GzDecoder(d) => {
d.write_all(input).map_err(CompressionError::IoTypeError)?;
d.flush().map_err(CompressionError::Io)?;
d.get_mut().drain(..)
}
Inner::GzEncoder(d) => {
d.write_all(input).map_err(CompressionError::IoTypeError)?;
d.flush().map_err(CompressionError::Io)?;
d.get_mut().drain(..)
}
}
.collect();
Ok(out)
}
#[op2]
#[buffer]
pub fn op_compression_finish(
#[cppgc] resource: &CompressionResource,
report_errors: bool,
) -> Result<Vec<u8>, CompressionError> {
let inner = resource
.0
.borrow_mut()
.take()
.ok_or(CompressionError::ResourceClosed)?;
let out = match inner {
Inner::DeflateDecoder(d) => {
d.finish().map_err(CompressionError::IoTypeError)
}
Inner::DeflateEncoder(d) => {
d.finish().map_err(CompressionError::IoTypeError)
}
Inner::DeflateRawDecoder(d) => {
d.finish().map_err(CompressionError::IoTypeError)
}
Inner::DeflateRawEncoder(d) => {
d.finish().map_err(CompressionError::IoTypeError)
}
Inner::GzDecoder(d) => d.finish().map_err(CompressionError::IoTypeError),
Inner::GzEncoder(d) => d.finish().map_err(CompressionError::IoTypeError),
};
match out {
Err(err) => {
if report_errors {
Err(err)
} else {
Ok(Vec::with_capacity(0))
}
}
Ok(out) => Ok(out),
}
}
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