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use crate::driver::ArchiveFileInfo;
use crate::zip::{ZipError, ZipResult};
use chrono::{DateTime, Local};
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum CompressionMethod {
Store,
Deflate,
BZip2,
Lzma,
Zstd,
Xz,
Unsupported(u16),
}
impl CompressionMethod {
pub(crate) fn from_struct_id(id: u16) -> ZipResult<Self> {
Ok(match id {
0 => Self::Store,
8 => Self::Deflate,
12 => Self::BZip2,
14 => Self::Lzma,
93 => Self::Zstd,
95 => Self::Xz,
1..=7 | 9..=11 | 13 | 15..=20 | 94 | 96..=99 => Self::Unsupported(id),
21..=92 | 100.. => return Err(ZipError::InvalidCompressionMethod(id).into()),
})
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum EncryptionMethod {
None,
Weak(u8),
Unsupported,
}
impl EncryptionMethod {
pub(crate) fn from_bif_flag(bit_flag: BitFlag, crc: u32, dos_time: u16) -> EncryptionMethod {
match (bit_flag.is_encrypted(), bit_flag.is_strong_encryption()) {
(false, false) => EncryptionMethod::None,
(true, false) => EncryptionMethod::Weak(if bit_flag.is_has_data_descriptor() {
(dos_time >> 8) as u8 // Info-ZIP modification
} else {
(crc >> 24) as u8
}),
(true, true) => EncryptionMethod::Unsupported,
_ => panic!("impossible"),
}
}
}
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub struct BitFlag {
flag: u16,
}
pub mod bit {
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum DeflateMode {
Normal,
Maximum,
Fast,
SuperFast,
}
}
macro_rules! get_set_bit_flag {
{$($get:ident $set:ident $bit:expr)+} => {
$(
pub fn $get(&self) -> bool {
self.get_bit($bit)
}
pub fn $set(&mut self, enable: bool) {
self.set_bit($bit, enable);
}
)*
};
}
impl BitFlag {
pub fn new(flag: u16) -> Self {
Self { flag }
}
#[inline]
fn get_bit(&self, bit: u32) -> bool {
(self.flag & 2u16.pow(bit)) > 0
}
#[inline]
fn set_bit(&mut self, bit: u32, enable: bool) {
if enable {
self.flag |= 2u16.pow(bit);
} else {
self.flag &= !2u16.pow(bit);
}
}
pub fn deflate_mode(&self) -> bit::DeflateMode {
match self.flag & 6 {
0 => bit::DeflateMode::Normal,
2 => bit::DeflateMode::Maximum,
4 => bit::DeflateMode::Fast,
6 => bit::DeflateMode::SuperFast,
_ => panic!("impossible"),
}
}
pub fn set_deflate_mode(&mut self, mode: bit::DeflateMode) {
match mode {
bit::DeflateMode::Normal => {
self.set_bit(1, false);
self.set_bit(2, false);
}
bit::DeflateMode::Maximum => {
self.set_bit(1, true);
self.set_bit(2, false);
}
bit::DeflateMode::Fast => {
self.set_bit(1, false);
self.set_bit(2, true);
}
bit::DeflateMode::SuperFast => {
self.set_bit(1, true);
self.set_bit(2, true);
}
}
}
get_set_bit_flag! {
is_encrypted set_encrypted 0
is_imploding_8k set_imploding_8k 1
is_imploding_3sf_trees set_imploding_3sf_trees 2
is_lzma_has_eos_marker set_lzma_has_eos_marker 1
is_has_data_descriptor set_has_data_descriptor 3
is_patched_data set_patched_data 5
is_strong_encryption set_strong_encryption 6
is_utf8 set_utf8 11
is_cd_encryption set_cd_encryption 13
}
}
#[derive(Debug, Clone)]
pub struct ZipFileInfo {
pub compression_method: CompressionMethod,
pub encryption_method: EncryptionMethod,
pub bit_flag: BitFlag,
pub mtime: DateTime<Local>,
pub atime: Option<DateTime<Local>>,
pub ctime: Option<DateTime<Local>>,
pub crc: u32,
pub compressed_size: u64,
pub size: u64,
pub header_pointer: u64,
pub name: String,
pub comment: String,
}
impl ZipFileInfo {
pub fn new(
compression_method: CompressionMethod,
encryption_method: EncryptionMethod,
bit_flag: BitFlag,
mtime: DateTime<Local>,
atime: Option<DateTime<Local>>,
ctime: Option<DateTime<Local>>,
crc: u32,
compressed_size: u64,
size: u64,
header_pointer: u64,
name: String,
comment: String,
) -> Self {
Self {
compression_method,
encryption_method,
bit_flag,
mtime,
atime,
ctime,
crc,
compressed_size,
size,
header_pointer,
name,
comment,
}
}
pub fn is_dir(&self) -> bool {
self.name.ends_with("/")
}
}
impl ArchiveFileInfo for ZipFileInfo {}
|
