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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::op2;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ToJsBuffer;
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::borrow::Cow;
use std::cell::RefCell;
use std::io::Write;
use std::rc::Rc;
#[derive(Debug)]
struct CompressionResource(RefCell<Inner>);
/// 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>>),
}
impl Resource for CompressionResource {
fn name(&self) -> Cow<str> {
"compression".into()
}
}
#[op2(fast)]
#[smi]
pub fn op_compression_new(
state: &mut OpState,
#[string] format: &str,
is_decoder: bool,
) -> ResourceId {
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()))
}
_ => unreachable!(),
};
let resource = CompressionResource(RefCell::new(inner));
state.resource_table.add(resource)
}
#[op2]
#[serde]
pub fn op_compression_write(
state: &mut OpState,
#[smi] rid: ResourceId,
#[anybuffer] input: &[u8],
) -> Result<ToJsBuffer, AnyError> {
let resource = state.resource_table.get::<CompressionResource>(rid)?;
let mut inner = resource.0.borrow_mut();
let out: Vec<u8> = match &mut *inner {
Inner::DeflateDecoder(d) => {
d.write_all(input).map_err(|e| type_error(e.to_string()))?;
d.flush()?;
d.get_mut().drain(..)
}
Inner::DeflateEncoder(d) => {
d.write_all(input).map_err(|e| type_error(e.to_string()))?;
d.flush()?;
d.get_mut().drain(..)
}
Inner::DeflateRawDecoder(d) => {
d.write_all(input).map_err(|e| type_error(e.to_string()))?;
d.flush()?;
d.get_mut().drain(..)
}
Inner::DeflateRawEncoder(d) => {
d.write_all(input).map_err(|e| type_error(e.to_string()))?;
d.flush()?;
d.get_mut().drain(..)
}
Inner::GzDecoder(d) => {
d.write_all(input).map_err(|e| type_error(e.to_string()))?;
d.flush()?;
d.get_mut().drain(..)
}
Inner::GzEncoder(d) => {
d.write_all(input).map_err(|e| type_error(e.to_string()))?;
d.flush()?;
d.get_mut().drain(..)
}
}
.collect();
Ok(out.into())
}
#[op2]
#[serde]
pub fn op_compression_finish(
state: &mut OpState,
#[smi] rid: ResourceId,
) -> Result<ToJsBuffer, AnyError> {
let resource = state.resource_table.take::<CompressionResource>(rid)?;
let resource = Rc::try_unwrap(resource).unwrap();
let inner = resource.0.into_inner();
let out: Vec<u8> = match inner {
Inner::DeflateDecoder(d) => {
d.finish().map_err(|e| type_error(e.to_string()))?
}
Inner::DeflateEncoder(d) => {
d.finish().map_err(|e| type_error(e.to_string()))?
}
Inner::DeflateRawDecoder(d) => {
d.finish().map_err(|e| type_error(e.to_string()))?
}
Inner::DeflateRawEncoder(d) => {
d.finish().map_err(|e| type_error(e.to_string()))?
}
Inner::GzDecoder(d) => d.finish().map_err(|e| type_error(e.to_string()))?,
Inner::GzEncoder(d) => d.finish().map_err(|e| type_error(e.to_string()))?,
};
Ok(out.into())
}
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