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//! Implementation for `miniz_oxide` rust backend.
use std::convert::TryInto;
use std::fmt;
use miniz_oxide::deflate::core::CompressorOxide;
use miniz_oxide::inflate::stream::InflateState;
pub use miniz_oxide::*;
pub const MZ_NO_FLUSH: isize = MZFlush::None as isize;
pub const MZ_PARTIAL_FLUSH: isize = MZFlush::Partial as isize;
pub const MZ_SYNC_FLUSH: isize = MZFlush::Sync as isize;
pub const MZ_FULL_FLUSH: isize = MZFlush::Full as isize;
pub const MZ_FINISH: isize = MZFlush::Finish as isize;
use super::*;
use crate::mem;
// miniz_oxide doesn't provide any error messages (yet?)
#[derive(Default)]
pub struct ErrorMessage;
impl ErrorMessage {
pub fn get(&self) -> Option<&str> {
None
}
}
fn format_from_bool(zlib_header: bool) -> DataFormat {
if zlib_header {
DataFormat::Zlib
} else {
DataFormat::Raw
}
}
pub struct Inflate {
inner: Box<InflateState>,
total_in: u64,
total_out: u64,
}
impl fmt::Debug for Inflate {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(
f,
"miniz_oxide inflate internal state. total_in: {}, total_out: {}",
self.total_in, self.total_out,
)
}
}
impl InflateBackend for Inflate {
fn make(zlib_header: bool, _window_bits: u8) -> Self {
let format = format_from_bool(zlib_header);
Inflate {
inner: InflateState::new_boxed(format),
total_in: 0,
total_out: 0,
}
}
fn decompress(
&mut self,
input: &[u8],
output: &mut [u8],
flush: FlushDecompress,
) -> Result<Status, DecompressError> {
let flush = MZFlush::new(flush as i32).unwrap();
let res = inflate::stream::inflate(&mut self.inner, input, output, flush);
self.total_in += res.bytes_consumed as u64;
self.total_out += res.bytes_written as u64;
match res.status {
Ok(status) => match status {
MZStatus::Ok => Ok(Status::Ok),
MZStatus::StreamEnd => Ok(Status::StreamEnd),
MZStatus::NeedDict => {
mem::decompress_need_dict(self.inner.decompressor().adler32().unwrap_or(0))
}
},
Err(status) => match status {
MZError::Buf => Ok(Status::BufError),
_ => mem::decompress_failed(ErrorMessage),
},
}
}
fn reset(&mut self, zlib_header: bool) {
self.inner.reset(format_from_bool(zlib_header));
self.total_in = 0;
self.total_out = 0;
}
}
impl Backend for Inflate {
#[inline]
fn total_in(&self) -> u64 {
self.total_in
}
#[inline]
fn total_out(&self) -> u64 {
self.total_out
}
}
pub struct Deflate {
inner: Box<CompressorOxide>,
total_in: u64,
total_out: u64,
}
impl fmt::Debug for Deflate {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(
f,
"miniz_oxide deflate internal state. total_in: {}, total_out: {}",
self.total_in, self.total_out,
)
}
}
impl DeflateBackend for Deflate {
fn make(level: Compression, zlib_header: bool, _window_bits: u8) -> Self {
// Check in case the integer value changes at some point.
debug_assert!(level.level() <= 10);
let mut inner: Box<CompressorOxide> = Box::default();
let format = format_from_bool(zlib_header);
inner.set_format_and_level(format, level.level().try_into().unwrap_or(1));
Deflate {
inner,
total_in: 0,
total_out: 0,
}
}
fn compress(
&mut self,
input: &[u8],
output: &mut [u8],
flush: FlushCompress,
) -> Result<Status, CompressError> {
let flush = MZFlush::new(flush as i32).unwrap();
let res = deflate::stream::deflate(&mut self.inner, input, output, flush);
self.total_in += res.bytes_consumed as u64;
self.total_out += res.bytes_written as u64;
match res.status {
Ok(status) => match status {
MZStatus::Ok => Ok(Status::Ok),
MZStatus::StreamEnd => Ok(Status::StreamEnd),
MZStatus::NeedDict => mem::compress_failed(ErrorMessage),
},
Err(status) => match status {
MZError::Buf => Ok(Status::BufError),
_ => mem::compress_failed(ErrorMessage),
},
}
}
fn reset(&mut self) {
self.total_in = 0;
self.total_out = 0;
self.inner.reset();
}
}
impl Backend for Deflate {
#[inline]
fn total_in(&self) -> u64 {
self.total_in
}
#[inline]
fn total_out(&self) -> u64 {
self.total_out
}
}