Struct fdeflate::Decompressor

pub struct Decompressor {
    compression: CompressedBlock,
    header: BlockHeader,
    uncompressed_bytes_left: u16,
    buffer: u64,
    nbits: u8,
    queued_rle: Option<(u8, usize)>,
    queued_backref: Option<(usize, usize)>,
    last_block: bool,
    fixed_table: bool,
    state: State,
    checksum: Adler32,
    ignore_adler32: bool,
}

Decompressor for arbitrary zlib streams.

Fields

compression: CompressedBlock

State for decoding a compressed block.

header: BlockHeader

uncompressed_bytes_left: u16

buffer: u64

nbits: u8

queued_rle: Option<(u8, usize)>

queued_backref: Option<(usize, usize)>

last_block: bool

fixed_table: bool

state: State

checksum: Adler32

ignore_adler32: bool

Implementations

impl Decompressor

pub fn new() -> Self

Create a new decompressor.

pub fn ignore_adler32(&mut self)

Ignore the checksum at the end of the stream.

fn fill_buffer(&mut self, input: &mut &[u8])

fn peak_bits(&mut self, nbits: u8) -> u64

fn consume_bits(&mut self, nbits: u8)

fn read_block_header( &mut self, remaining_input: &mut &[u8], ) -> Result<(), DecompressionError>

fn read_code_length_codes( &mut self, remaining_input: &mut &[u8], ) -> Result<(), DecompressionError>

fn read_code_lengths( &mut self, remaining_input: &mut &[u8], ) -> Result<(), DecompressionError>

fn build_tables( hlit: usize, code_lengths: &[u8], compression: &mut CompressedBlock, ) -> Result<(), DecompressionError>

fn read_compressed( &mut self, remaining_input: &mut &[u8], output: &mut [u8], output_index: usize, ) -> Result<usize, DecompressionError>

pub fn read( &mut self, input: &[u8], output: &mut [u8], output_position: usize, end_of_input: bool, ) -> Result<(usize, usize), DecompressionError>

Decompresses a chunk of data.

Returns the number of bytes read from input and the number of bytes written to output, or an error if the deflate stream is not valid. input is the compressed data. output is the buffer to write the decompressed data to, starting at index output_position. end_of_input indicates whether more data may be available in the future.

The contents of output after output_position are ignored. However, this function may write additional data to output past what is indicated by the return value.

When this function returns Ok, at least one of the following is true:

• The input is fully consumed.
• The output is full but there are more bytes to output.
• The deflate stream is complete (and is_done will return true).

Panics

This function will panic if output_position is out of bounds.

pub fn is_done(&self) -> bool

Returns true if the decompressor has finished decompressing the input.

Trait Implementations

impl Default for Decompressor

fn default() -> Self

Returns the “default value” for a type.