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use crate::driver::FileDriver;
use crate::utils::{IoCursor, ReadUtils};
use crate::zip::{CompressionMethod, ZipError, ZipFileInfo, ZipResult};
use bzip2::read::BzDecoder;
use flate2::read::DeflateDecoder;
use liblzma::read::XzDecoder;
use liblzma::stream::{Filters, LzmaOptions, Stream};
use std::io::{
BufReader, Error as IoError, ErrorKind as IoErrorKind, Read, Result as IoResult, Seek, SeekFrom,
};
use zstd::stream::Decoder as ZstdDecoder;
enum Compression<Io: Read> {
Store(Io),
Deflate(DeflateDecoder<Io>),
BZip2(BzDecoder<Io>),
Zstd(ZstdDecoder<'static, BufReader<Io>>),
Xz(XzDecoder<Io>),
}
pub struct ZipFileReader<'d, Io: Read> {
io: Compression<IoCursor<&'d mut Io>>,
info: &'d ZipFileInfo,
}
impl<'d, Io: Read> FileDriver for ZipFileReader<'d, Io> {
type Io = Io;
type FileInfo = ZipFileInfo;
fn info(&self) -> &Self::FileInfo {
self.info
}
}
impl<'d, Io: Read + Seek> ZipFileReader<'d, Io> {
pub fn new(io: &'d mut Io, info: &'d ZipFileInfo) -> ZipResult<Self> {
io.seek(SeekFrom::Start(info.header_pointer))?;
let buf = io.read_arr::<30>()?;
if u32::from_le_bytes(buf[..4].try_into().unwrap()) != 0x04034b50 {
return Err(ZipError::InvalidFileHeaderSignature.into());
}
let data_pointer = info.header_pointer
+ 30
+ u16::from_le_bytes(buf[26..28].try_into().unwrap()) as u64
+ u16::from_le_bytes(buf[28..30].try_into().unwrap()) as u64;
Ok(Self {
io: match info.compression_method {
CompressionMethod::Store => Compression::Store(IoCursor::new(
io,
data_pointer,
data_pointer + info.compressed_size,
)?),
CompressionMethod::Deflate => Compression::Deflate(DeflateDecoder::new(
IoCursor::new(io, data_pointer, data_pointer + info.compressed_size)?,
)),
CompressionMethod::BZip2 => Compression::BZip2(BzDecoder::new(IoCursor::new(
io,
data_pointer,
data_pointer + info.compressed_size,
)?)),
CompressionMethod::Lzma => {
io.seek(SeekFrom::Start(data_pointer))?;
let buf = io.read_arr::<9>()?;
Compression::Xz(XzDecoder::new_stream(
IoCursor::new(io, data_pointer + 9, data_pointer + info.compressed_size)?,
Stream::new_raw_decoder(
Filters::new().lzma1(
LzmaOptions::new()
.literal_context_bits((buf[4] % 9) as u32)
.literal_position_bits((buf[4] / 9 % 5) as u32)
.position_bits((buf[4] / 45) as u32)
.dict_size(
u32::from_le_bytes(buf[5..9].try_into().unwrap()).max(4096),
),
),
)
.unwrap(),
))
}
CompressionMethod::Zstd => Compression::Zstd(
ZstdDecoder::new(IoCursor::new(
io,
data_pointer,
data_pointer + info.compressed_size,
)?)
.unwrap(),
),
CompressionMethod::Xz => Compression::Xz(XzDecoder::new(IoCursor::new(
io,
data_pointer,
data_pointer + info.compressed_size,
)?)),
CompressionMethod::Unsupported => {
return Err(ZipError::UnsupportedCompressionMethod.into())
}
},
info,
})
}
pub fn seekable(&self) -> bool {
match self.io {
Compression::Store(..) => true,
_ => false,
}
}
}
impl<'d, Io: Read> Read for ZipFileReader<'d, Io> {
fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
match &mut self.io {
Compression::Store(io) => io.read(buf),
Compression::Deflate(io) => io.read(buf),
Compression::BZip2(io) => io.read(buf),
Compression::Zstd(io) => io.read(buf),
Compression::Xz(io) => io.read(buf),
}
}
}
impl<'d, Io: Read + Seek> Seek for ZipFileReader<'d, Io> {
fn seek(&mut self, pos: SeekFrom) -> IoResult<u64> {
match &mut self.io {
Compression::Store(io) => io.seek(pos),
_ => Err(IoError::new(
IoErrorKind::Unsupported,
ZipError::CompressedDataIsUnseekable,
)),
}
}
}
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