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107 lines
2.7 KiB
Rust
107 lines
2.7 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::AnyError;
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use deno_core::op;
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use deno_core::OpState;
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use deno_core::Resource;
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use deno_core::ResourceId;
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use deno_core::ZeroCopyBuf;
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use flate2::write::GzDecoder;
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use flate2::write::GzEncoder;
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use flate2::write::ZlibDecoder;
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use flate2::write::ZlibEncoder;
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use flate2::Compression;
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use std::borrow::Cow;
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use std::cell::RefCell;
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use std::io::Write;
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use std::rc::Rc;
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#[derive(Debug)]
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struct CompressionResource(RefCell<Inner>);
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#[derive(Debug)]
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enum Inner {
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DeflateDecoder(ZlibDecoder<Vec<u8>>),
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DeflateEncoder(ZlibEncoder<Vec<u8>>),
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GzDecoder(GzDecoder<Vec<u8>>),
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GzEncoder(GzEncoder<Vec<u8>>),
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}
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impl Resource for CompressionResource {
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fn name(&self) -> Cow<str> {
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"compression".into()
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}
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}
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#[op]
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pub fn op_compression_new(
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state: &mut OpState,
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format: String,
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is_decoder: bool,
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) -> Result<ResourceId, AnyError> {
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let w = Vec::new();
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let inner = match (format.as_str(), is_decoder) {
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("deflate", true) => Inner::DeflateDecoder(ZlibDecoder::new(w)),
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("deflate", false) => {
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Inner::DeflateEncoder(ZlibEncoder::new(w, Compression::default()))
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}
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("gzip", true) => Inner::GzDecoder(GzDecoder::new(w)),
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("gzip", false) => {
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Inner::GzEncoder(GzEncoder::new(w, Compression::default()))
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}
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_ => unreachable!(),
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};
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let resource = CompressionResource(RefCell::new(inner));
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Ok(state.resource_table.add(resource))
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}
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#[op]
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pub fn op_compression_write(
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state: &mut OpState,
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rid: ResourceId,
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input: ZeroCopyBuf,
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) -> Result<ZeroCopyBuf, AnyError> {
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let resource = state.resource_table.get::<CompressionResource>(rid)?;
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let mut inner = resource.0.borrow_mut();
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let out: Vec<u8> = match &mut *inner {
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Inner::DeflateDecoder(d) => {
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d.write_all(&input)?;
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d.flush()?;
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d.get_mut().drain(..)
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}
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Inner::DeflateEncoder(d) => {
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d.write_all(&input)?;
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d.flush()?;
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d.get_mut().drain(..)
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}
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Inner::GzDecoder(d) => {
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d.write_all(&input)?;
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d.flush()?;
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d.get_mut().drain(..)
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}
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Inner::GzEncoder(d) => {
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d.write_all(&input)?;
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d.flush()?;
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d.get_mut().drain(..)
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}
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}
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.collect();
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Ok(out.into())
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}
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#[op]
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pub fn op_compression_finish(
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state: &mut OpState,
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rid: ResourceId,
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) -> Result<ZeroCopyBuf, AnyError> {
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let resource = state.resource_table.take::<CompressionResource>(rid)?;
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let resource = Rc::try_unwrap(resource).unwrap();
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let inner = resource.0.into_inner();
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let out: Vec<u8> = match inner {
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Inner::DeflateDecoder(d) => d.finish()?,
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Inner::DeflateEncoder(d) => d.finish()?,
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Inner::GzDecoder(d) => d.finish()?,
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Inner::GzEncoder(d) => d.finish()?,
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};
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Ok(out.into())
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}
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