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use crate::driver::ArchiveFile;
use crate::zip::{ZipError, ZipResult};
use chrono::{DateTime, Local};
pub enum CompressionMethod {
Store,
Deflate,
BZIP2,
LZMA,
ZStd,
XZ,
}
impl CompressionMethod {
pub(crate) fn from_struct_id(id: u16) -> ZipResult<Self> {
match id {
0 => Ok(Self::Store),
8 => Ok(Self::Deflate),
12 => Ok(Self::BZIP2),
14 => Ok(Self::LZMA),
93 => Ok(Self::ZStd),
95 => Ok(Self::XZ),
1..=7 | 9..=11 | 13 | 15..=20 | 94 | 96..=99 => {
Err(ZipError::UnsupportedCompressionMethod.into())
}
21..=92 | 100.. => Err(ZipError::InvalidCompressionMethod.into()),
}
}
}
pub struct BitFlag {
flag: u16,
}
pub mod bit {
#[derive(Debug, PartialEq, Eq)]
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
}
}
pub struct ZipFile {
pub compression_method: CompressionMethod,
pub bit_flag: BitFlag,
pub datetime: DateTime<Local>,
pub crc: u32,
pub compressed_size: u64,
pub size: u64,
pub header_pointer: u64,
pub name: String,
pub comment: String,
}
impl ZipFile {
pub fn new(
compression_method: CompressionMethod,
bit_flag: BitFlag,
datetime: DateTime<Local>,
crc: u32,
compressed_size: u64,
size: u64,
header_pointer: u64,
name: String,
comment: String,
) -> Self {
Self {
compression_method,
bit_flag,
datetime,
crc,
compressed_size,
size,
header_pointer,
name,
comment,
}
}
}
impl ArchiveFile for ZipFile {}
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