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use crate::{encoding, error::*, fields, format::*};
use chrono::offset::TimeZone;
use nom::{
bytes::streaming::tag,
number::streaming::{le_u16, le_u32},
sequence::preceded,
};
use tracing::trace;
/// 4.3.12 Central directory structure: File header
pub struct DirectoryHeader {
// version made by
pub creator_version: Version,
// version needed to extract
pub reader_version: Version,
// general purpose bit flag
pub flags: u16,
// compression method
pub method: u16,
// last mod file datetime
pub modified: MsdosTimestamp,
// crc32
pub crc32: u32,
// compressed size
pub compressed_size: u32,
// uncompressed size
pub uncompressed_size: u32,
// disk number start
pub disk_nbr_start: u16,
// internal file attributes
pub internal_attrs: u16,
// external file attributes
pub external_attrs: u32,
// relative offset of local header
pub header_offset: u32,
// name
pub name: ZipString,
// extra
pub extra: ZipBytes, // comment
pub comment: ZipString,
}
impl DirectoryHeader {
const SIGNATURE: &'static str = "PK\x01\x02";
pub fn parse(i: &[u8]) -> parse::Result<'_, Self> {
preceded(
tag(Self::SIGNATURE),
fields!({
creator_version: Version::parse,
reader_version: Version::parse,
flags: le_u16,
method: le_u16,
modified: MsdosTimestamp::parse,
crc32: le_u32,
compressed_size: le_u32,
uncompressed_size: le_u32,
name_len: le_u16,
extra_len: le_u16,
comment_len: le_u16,
disk_nbr_start: le_u16,
internal_attrs: le_u16,
external_attrs: le_u32,
header_offset: le_u32,
} chain {
fields!({
name: ZipString::parser(name_len),
extra: ZipBytes::parser(extra_len),
comment: ZipString::parser(comment_len),
} map Self {
creator_version,
reader_version,
flags,
method,
modified,
crc32,
compressed_size,
uncompressed_size,
disk_nbr_start,
internal_attrs,
external_attrs,
header_offset,
name,
extra,
comment,
})
}),
)(i)
}
}
impl DirectoryHeader {
pub fn is_non_utf8(&self) -> bool {
let (valid1, require1) = encoding::detect_utf8(&self.name.0[..]);
let (valid2, require2) = encoding::detect_utf8(&self.comment.0[..]);
if !valid1 || !valid2 {
// definitely not utf-8
return true;
}
if !require1 && !require2 {
// name and comment only use single-byte runes that overlap with UTF-8
return false;
}
// Might be UTF-8, might be some other encoding; preserve existing flag.
// Some ZIP writers use UTF-8 encoding without setting the UTF-8 flag.
// Since it is impossible to always distinguish valid UTF-8 from some
// other encoding (e.g., GBK or Shift-JIS), we trust the flag.
self.flags & 0x800 == 0
}
pub fn as_stored_entry(
&self,
is_zip64: bool,
encoding: Encoding,
global_offset: u64,
) -> Result<StoredEntry, Error> {
let mut comment: Option<String> = None;
if let Some(comment_field) = self.comment.clone().into_option() {
comment = Some(encoding.decode(&comment_field.0)?);
}
let name = encoding.decode(&self.name.0)?;
let mut compressed_size = self.compressed_size as u64;
let mut uncompressed_size = self.uncompressed_size as u64;
let mut header_offset = self.header_offset as u64 + global_offset;
let mut modified: Option<DateTime<Utc>> = None;
let mut created: Option<DateTime<Utc>> = None;
let mut accessed: Option<DateTime<Utc>> = None;
let mut uid: Option<u32> = None;
let mut gid: Option<u32> = None;
let mut extra_fields: Vec<ExtraField> = Vec::new();
let settings = ExtraFieldSettings {
needs_compressed_size: self.uncompressed_size == !0u32,
needs_uncompressed_size: self.compressed_size == !0u32,
needs_header_offset: self.header_offset == !0u32,
};
let mut slice = &self.extra.0[..];
while !slice.is_empty() {
match ExtraField::parse(slice, &settings) {
Ok((remaining, ef)) => {
match &ef {
ExtraField::Zip64(z64) => {
if let Some(n) = z64.uncompressed_size {
uncompressed_size = n;
}
if let Some(n) = z64.compressed_size {
compressed_size = n;
}
if let Some(n) = z64.header_offset {
header_offset = n;
}
}
ExtraField::Timestamp(ts) => {
modified = Utc.timestamp_opt(ts.mtime as i64, 0).single();
}
ExtraField::Ntfs(nf) => {
for attr in &nf.attrs {
// note: other attributes are unsupported
if let NtfsAttr::Attr1(attr) = attr {
modified = attr.mtime.to_datetime();
created = attr.ctime.to_datetime();
accessed = attr.atime.to_datetime();
}
}
}
ExtraField::Unix(uf) => {
modified = Utc.timestamp_opt(uf.mtime as i64, 0).single();
if uid.is_none() {
uid = Some(uf.uid as u32);
}
if gid.is_none() {
gid = Some(uf.gid as u32);
}
}
ExtraField::NewUnix(uf) => {
uid = Some(uf.uid as u32);
gid = Some(uf.uid as u32);
}
_ => {}
};
extra_fields.push(ef);
slice = remaining;
}
Err(e) => {
trace!("extra field error: {:#?}", e);
return Err(FormatError::InvalidExtraField.into());
}
}
}
let modified = match modified {
Some(m) => Some(m),
None => self.modified.to_datetime(),
};
let mut mode: Mode = match self.creator_version.host_system() {
HostSystem::Unix | HostSystem::Osx => UnixMode(self.external_attrs >> 16).into(),
HostSystem::WindowsNtfs | HostSystem::Vfat | HostSystem::MsDos => {
MsdosMode(self.external_attrs).into()
}
_ => Mode(0),
};
if name.ends_with('/') {
// believe it or not, this is straight from the APPNOTE
mode |= Mode::DIR
};
Ok(StoredEntry {
entry: Entry {
name,
method: self.method.into(),
comment,
modified: modified.unwrap_or_else(zero_datetime),
created,
accessed,
},
creator_version: self.creator_version,
reader_version: self.reader_version,
flags: self.flags,
crc32: self.crc32,
compressed_size,
uncompressed_size,
header_offset,
uid,
gid,
mode,
extra_fields,
external_attrs: self.external_attrs,
is_zip64,
})
}
}