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use crate::driver::FileDriver;
use crate::utils::{IoCursor, ReadUtils};
use crate::zip::encryption::WeakDecoder;
use crate::zip::{CompressionMethod, EncryptionMethod, 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 Encryption<Io: Read> {
None(Io),
Weak(WeakDecoder<Io>),
}
impl<Io: Read> Encryption<Io> {
pub fn new(io: Io, info: &ZipFileInfo, password: Option<&[u8]>) -> ZipResult<Self> {
Ok(match info.encryption_method {
EncryptionMethod::None => Self::None(io),
EncryptionMethod::Weak(check) => Self::Weak(WeakDecoder::new(
io,
check,
password.ok_or(ZipError::PasswordIsNotSpecified)?,
)?),
EncryptionMethod::Unsupported => {
return Err(ZipError::UnsupportedEncryptionMethod.into())
}
})
}
}
impl<Io: Read> Read for Encryption<Io> {
fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
match self {
Self::None(io) => io.read(buf),
Self::Weak(io) => io.read(buf),
}
}
}
impl<Io: Read + Seek> Seek for Encryption<Io> {
fn seek(&mut self, pos: SeekFrom) -> IoResult<u64> {
match self {
Self::None(io) => io.seek(pos),
_ => Err(IoError::new(
IoErrorKind::Unsupported,
ZipError::EncryptedDataIsUnseekable,
)),
}
}
}
enum Compression<Io: Read> {
Store(Io),
Deflate(DeflateDecoder<Io>),
BZip2(BzDecoder<Io>),
Zstd(ZstdDecoder<'static, BufReader<Io>>),
Xz(XzDecoder<Io>),
}
impl<Io: Read + Seek> Compression<Io> {
pub fn new(mut io: Io, info: &ZipFileInfo) -> ZipResult<Self> {
Ok(match info.compression_method {
CompressionMethod::Store => Self::Store(io),
CompressionMethod::Deflate => Self::Deflate(DeflateDecoder::new(io)),
CompressionMethod::BZip2 => Self::BZip2(BzDecoder::new(io)),
CompressionMethod::Lzma => {
let buf = io.read_arr::<9>()?;
Compression::Xz(XzDecoder::new_stream(
io,
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 => Self::Zstd(ZstdDecoder::new(io)?),
CompressionMethod::Xz => Self::Xz(XzDecoder::new(io)),
CompressionMethod::Unsupported(id) => {
return Err(ZipError::UnsupportedCompressionMethod(id).into())
}
})
}
}
impl<Io: Read> Read for Compression<Io> {
fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
match self {
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<Io: Read + Seek> Seek for Compression<Io> {
fn seek(&mut self, pos: SeekFrom) -> IoResult<u64> {
match self {
Compression::Store(io) => io.seek(pos),
_ => Err(IoError::new(
IoErrorKind::Unsupported,
ZipError::CompressedDataIsUnseekable,
)),
}
}
}
pub struct ZipFileReader<'d, Io: Read> {
io: Compression<Encryption<IoCursor<&'d mut Io>>>,
info: &'d ZipFileInfo,
}
impl<'d, Io: Read> FileDriver for ZipFileReader<'d, Io> {
type Io = Io;
type FileInfo = ZipFileInfo;
}
impl<'d, Io: Read + Seek> ZipFileReader<'d, Io> {
pub(crate) fn new(
io: &'d mut Io,
info: &'d ZipFileInfo,
password: Option<&[u8]>,
) -> 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: Compression::new(
Encryption::new(
IoCursor::new(io, data_pointer, data_pointer + info.compressed_size)?,
info,
password,
)?,
info,
)?,
info,
})
}
pub fn info(&self) -> &ZipFileInfo {
self.info
}
pub fn is_seekable(&self) -> bool {
match self.io {
Compression::Store(Encryption::None(..)) => true,
_ => false,
}
}
}
impl<'d, Io: Read> Read for ZipFileReader<'d, Io> {
fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
self.io.read(buf)
}
}
impl<'d, Io: Read + Seek> Seek for ZipFileReader<'d, Io> {
fn seek(&mut self, pos: SeekFrom) -> IoResult<u64> {
self.io.seek(pos)
}
}
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