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|
use crate::driver::{ArchiveRead, ArchiveWrite, Driver};
use crate::zip::error::{ZipError, ZipResult};
use crate::zip::structs::{deserialize, EOCDR64Locator, CDR, EOCDR, EOCDR64};
use crate::zip::ZipFile;
use std::collections::HashMap as Map;
use std::fs::File;
use std::io::{Read, Seek, SeekFrom, Write};
pub struct Zip<IO = File> {
io: IO,
files: Map<String, ZipFile>,
comment: String,
}
impl<IO> Driver for Zip<IO> {
type Error = ZipError;
type IO = IO;
type File = ZipFile;
}
impl<IO: Read + Seek> ArchiveRead for Zip<IO> {
fn read(mut io: Self::IO) -> ZipResult<Self> {
// Search eocdr
let limit = 65557.min(io.seek(SeekFrom::End(0))?) as i64;
let start = io.seek(SeekFrom::End(-limit))?;
let pos = start + {
let mut buf = vec![0; limit as usize];
io.read(&mut buf)?;
buf[..buf.len() - 18]
.windows(4)
.rposition(|v| u32::from_le_bytes(v.try_into().unwrap()) == 0x06054b50)
.ok_or(ZipError::EOCDRNotFound)? as u64
};
// Read eocdr
io.seek(SeekFrom::Start(pos + 4))?;
let buf = {
let mut buf = [0; 18];
io.read(&mut buf)?;
buf
};
let eocdr: EOCDR = deserialize(&buf).map_err(|_| ZipError::InvalidEOCDR)?;
let comment = {
let mut buf: Vec<u8> = vec![0; eocdr.comment_len as usize];
io.read(&mut buf)?;
String::from_utf8(buf).map_err(|_| ZipError::InvalidArchiveComment)?
};
// Try to find eocdr64locator
io.seek(SeekFrom::Start(pos - 20))?;
let buf = {
let mut buf = [0; 20];
io.read(&mut buf)?;
buf
};
let (cd_pointer, cd_size, cd_records) = if u32::from_le_bytes(buf[0..4].try_into().unwrap())
== 0x07064b50
{
let eocdr64locator: EOCDR64Locator =
deserialize(&buf[4..]).map_err(|_| ZipError::InvalidEOCDR64Locator)?;
io.seek(SeekFrom::Start(eocdr64locator.eocdr64_pointer))?;
let buf = {
let mut buf = [0; 56];
io.read(&mut buf)?;
buf
};
if u32::from_le_bytes(buf[0..4].try_into().unwrap()) != 0x06064b50 {
return Err(ZipError::InvalidEOCDR64Signature.into());
}
let eocdr64: EOCDR64 = deserialize(&buf[4..]).map_err(|_| ZipError::InvalidEOCDR64)?;
(eocdr64.cd_pointer, eocdr64.cd_size, eocdr64.cd_records)
} else {
(
eocdr.cd_pointer as u64,
eocdr.cd_size as u64,
eocdr.cd_records as u64,
)
};
// Read cd records
let mut files = Map::with_capacity(cd_records as usize);
io.seek(SeekFrom::Start(cd_pointer))?;
let buf = {
let mut buf = vec![0; cd_size as usize];
io.read(&mut buf)?;
buf
};
let mut p: usize = 0;
for _ in 0..cd_records {
if u32::from_le_bytes(buf[p..p + 4].try_into().unwrap()) != 0x02014b50 {
return Err(ZipError::InvalidCDRSignature.into());
}
p += 4;
let cdr: CDR = deserialize(&buf[p..p + 42]).map_err(|_| ZipError::InvalidCDR)?;
p += 42;
let name = String::from_utf8(buf[p..p + cdr.name_len as usize].into()).unwrap();
p += cdr.name_len as usize;
let extra_fields: Vec<u8> = buf[p..p + cdr.extra_field_len as usize].into();
p += cdr.extra_field_len as usize;
let comment = String::from_utf8(buf[p..p + cdr.comment_len as usize].into()).unwrap();
p += cdr.comment_len as usize;
files.insert(
name.clone(),
ZipFile::new(
name,
cdr.dos_date,
cdr.dos_time,
cdr.compression_method,
cdr.compressed_size as u64,
cdr.size as u64,
comment,
),
);
}
Ok(Self { io, files, comment })
}
}
impl<IO: Read + Seek> Zip<IO> {}
impl<IO: Read + Write + Seek> ArchiveWrite for Zip<IO> {}
impl<IO: Read + Write> Zip<IO> {}
|
