#![cfg_attr(not(feature="std"), allow(unused_imports))]
use super::combined_alloc::BrotliAlloc;
use super::encode::{BrotliEncoderCreateInstance, BrotliEncoderDestroyInstance,
BrotliEncoderParameter, BrotliEncoderSetParameter, BrotliEncoderOperation,
BrotliEncoderStateStruct, BrotliEncoderCompressStream, BrotliEncoderIsFinished};
use super::backward_references::BrotliEncoderParams;
use super::interface;
use brotli_decompressor::CustomRead;
#[cfg(feature="std")]
pub use brotli_decompressor::{IntoIoReader, IoReaderWrapper, IoWriterWrapper};
pub use alloc::{AllocatedStackMemory, Allocator, SliceWrapper, SliceWrapperMut, StackAllocator};
#[cfg(feature="std")]
pub use alloc_stdlib::StandardAlloc;
#[cfg(feature="std")]
use std::io;
#[cfg(feature="std")]
use std::io::{Read, Error, ErrorKind};
#[cfg(feature="std")]
pub struct CompressorReaderCustomAlloc<R: Read,
BufferType : SliceWrapperMut<u8>,
Alloc: BrotliAlloc> (
CompressorReaderCustomIo<io::Error,
IntoIoReader<R>,
BufferType,
Alloc>);
#[cfg(feature="std")]
impl<R: Read,
BufferType : SliceWrapperMut<u8>,
Alloc: BrotliAlloc>
CompressorReaderCustomAlloc<R, BufferType, Alloc>
{
pub fn new(r: R, buffer : BufferType,
alloc: Alloc,
q: u32,
lgwin: u32) -> Self {
CompressorReaderCustomAlloc::<R, BufferType, Alloc>(
CompressorReaderCustomIo::<Error,
IntoIoReader<R>,
BufferType,
Alloc>::new(
IntoIoReader::<R>(r),
buffer,
alloc,
Error::new(ErrorKind::InvalidData,
"Invalid Data"),
q, lgwin))
}
pub fn get_ref(&self) -> &R {
&self.0.get_ref().0
}
}
#[cfg(feature="std")]
impl<R: Read,
BufferType: SliceWrapperMut<u8>,
Alloc: BrotliAlloc>
Read for CompressorReaderCustomAlloc<R, BufferType,
Alloc> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error> {
self.0.read(buf)
}
}
#[cfg(feature="std")]
pub struct CompressorReader<R: Read>(CompressorReaderCustomAlloc<R,
<StandardAlloc as Allocator<u8>>::AllocatedMemory,
StandardAlloc>);
#[cfg(feature="std")]
impl<R: Read> CompressorReader<R> {
pub fn new(r: R, buffer_size: usize, q: u32, lgwin: u32) -> Self {
let mut alloc = StandardAlloc::default();
let buffer = <StandardAlloc as Allocator<u8>>::alloc_cell(&mut alloc,
if buffer_size == 0 { 4096} else {buffer_size});
CompressorReader::<R>(CompressorReaderCustomAlloc::new(r,
buffer,
alloc,
q,
lgwin))
}
pub fn with_params(r: R, buffer_size: usize, params: &BrotliEncoderParams) -> Self {
let mut reader = Self::new(r, buffer_size, params.quality as u32, params.lgwin as u32);
(reader.0).0.state.params = params.clone();
reader
}
pub fn get_ref(&self) -> &R {
self.0.get_ref()
}
}
#[cfg(feature="std")]
impl<R: Read> Read for CompressorReader<R> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error> {
self.0.read(buf)
}
}
pub struct CompressorReaderCustomIo<ErrType,
R: CustomRead<ErrType>,
BufferType: SliceWrapperMut<u8>,
Alloc: BrotliAlloc>
{
input_buffer: BufferType,
total_out: Option<usize>,
input_offset: usize,
input_len: usize,
input: R,
input_eof: bool,
error_if_invalid_data: Option<ErrType>,
state: BrotliEncoderStateStruct<Alloc>,
}
impl<ErrType,
R: CustomRead<ErrType>,
BufferType : SliceWrapperMut<u8>,
Alloc: BrotliAlloc>
CompressorReaderCustomIo<ErrType, R, BufferType, Alloc>
{
pub fn new(r: R, buffer : BufferType,
alloc : Alloc,
invalid_data_error_type : ErrType,
q: u32,
lgwin: u32) -> Self {
let mut ret = CompressorReaderCustomIo{
input_buffer : buffer,
total_out : Some(0),
input_offset : 0,
input_len : 0,
input_eof : false,
input: r,
state : BrotliEncoderCreateInstance(alloc),
error_if_invalid_data : Some(invalid_data_error_type),
};
BrotliEncoderSetParameter(&mut ret.state,
BrotliEncoderParameter::BROTLI_PARAM_QUALITY,
q as (u32));
BrotliEncoderSetParameter(&mut ret.state,
BrotliEncoderParameter::BROTLI_PARAM_LGWIN,
lgwin as (u32));
ret
}
pub fn copy_to_front(&mut self) {
let avail_in = self.input_len - self.input_offset;
if self.input_offset == self.input_buffer.slice_mut().len() {
self.input_offset = 0;
self.input_len = 0;
} else if self.input_offset + 256 > self.input_buffer.slice_mut().len() && avail_in < self.input_offset {
let (first, second) = self.input_buffer.slice_mut().split_at_mut(self.input_offset);
first[0..avail_in].clone_from_slice(&second[0..avail_in]);
self.input_len -= self.input_offset;
self.input_offset = 0;
}
}
pub fn get_ref(&self) -> &R {
&self.input
}
}
impl<ErrType,
R: CustomRead<ErrType>,
BufferType : SliceWrapperMut<u8>,
Alloc: BrotliAlloc> Drop for
CompressorReaderCustomIo<ErrType, R, BufferType, Alloc> {
fn drop(&mut self) {
BrotliEncoderDestroyInstance(&mut self.state);
}
}
impl<ErrType,
R: CustomRead<ErrType>,
BufferType : SliceWrapperMut<u8>,
Alloc: BrotliAlloc> CustomRead<ErrType> for
CompressorReaderCustomIo<ErrType, R, BufferType, Alloc> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize, ErrType > {
let mut nop_callback = |_data:&mut interface::PredictionModeContextMap<interface::InputReferenceMut>,
_cmds: &mut [interface::StaticCommand],
_mb: interface::InputPair, _mfv: &mut Alloc|();
let mut output_offset : usize = 0;
let mut avail_out = buf.len();
let mut avail_in = self.input_len - self.input_offset;
while output_offset == 0 {
if self.input_len < self.input_buffer.slice_mut().len() && !self.input_eof {
match self.input.read(&mut self.input_buffer.slice_mut()[self.input_len..]) {
Err(e) => return Err(e),
Ok(size) => if size == 0 {
self.input_eof = true;
}else {
self.input_len += size;
avail_in = self.input_len - self.input_offset;
},
}
}
let op : BrotliEncoderOperation;
if avail_in == 0 {
op = BrotliEncoderOperation::BROTLI_OPERATION_FINISH;
} else {
op = BrotliEncoderOperation::BROTLI_OPERATION_PROCESS;
}
let ret = BrotliEncoderCompressStream(
&mut self.state,
op,
&mut avail_in,
&self.input_buffer.slice_mut()[..],
&mut self.input_offset,
&mut avail_out,
buf,
&mut output_offset,
&mut self.total_out,
&mut nop_callback);
if avail_in == 0 {
self.copy_to_front();
}
if ret <= 0 {
return Err(self.error_if_invalid_data.take().unwrap());
}
let fin = BrotliEncoderIsFinished(&mut self.state);
if fin != 0 {
break;
}
}
Ok(output_offset)
}
}