use crate::base::write::{CentralDirectoryEntry, ZipFileWriter};
use crate::entry::ZipEntry;
use crate::error::{Result, Zip64ErrorCase, ZipError};
use crate::spec::extra_field::Zip64ExtendedInformationExtraFieldBuilder;
use crate::spec::{
extra_field::ExtraFieldAsBytes,
header::{CentralDirectoryRecord, ExtraField, GeneralPurposeFlag, LocalFileHeader},
Compression,
};
use crate::StringEncoding;
#[cfg(any(feature = "deflate", feature = "bzip2", feature = "zstd", feature = "lzma", feature = "xz"))]
use futures_util::io::Cursor;
use crate::spec::consts::{NON_ZIP64_MAX_NUM_FILES, NON_ZIP64_MAX_SIZE};
#[cfg(any(feature = "deflate", feature = "bzip2", feature = "zstd", feature = "lzma", feature = "xz"))]
use async_compression::futures::write;
use crc32fast::Hasher;
use futures_util::io::{AsyncWrite, AsyncWriteExt};
pub struct EntryWholeWriter<'b, 'c, W: AsyncWrite + Unpin> {
writer: &'b mut ZipFileWriter<W>,
entry: ZipEntry,
data: &'c [u8],
}
impl<'b, 'c, W: AsyncWrite + Unpin> EntryWholeWriter<'b, 'c, W> {
pub fn from_raw(writer: &'b mut ZipFileWriter<W>, entry: ZipEntry, data: &'c [u8]) -> Self {
Self { writer, entry, data }
}
pub async fn write(mut self) -> Result<()> {
let mut _compressed_data: Option<Vec<u8>> = None;
let compressed_data = match self.entry.compression() {
Compression::Stored => self.data,
#[cfg(any(
feature = "deflate",
feature = "bzip2",
feature = "zstd",
feature = "lzma",
feature = "xz",
feature = "deflate64"
))]
_ => {
_compressed_data =
Some(compress(self.entry.compression(), self.data, self.entry.compression_level).await);
_compressed_data.as_ref().unwrap()
}
};
let mut zip64_extra_field_builder = None;
let (lfh_uncompressed_size, lfh_compressed_size) = if self.data.len() as u64 > NON_ZIP64_MAX_SIZE as u64
|| compressed_data.len() as u64 > NON_ZIP64_MAX_SIZE as u64
{
if self.writer.force_no_zip64 {
return Err(ZipError::Zip64Needed(Zip64ErrorCase::LargeFile));
}
if !self.writer.is_zip64 {
self.writer.is_zip64 = true;
}
zip64_extra_field_builder = Some(
Zip64ExtendedInformationExtraFieldBuilder::new()
.sizes(compressed_data.len() as u64, self.data.len() as u64),
);
(NON_ZIP64_MAX_SIZE, NON_ZIP64_MAX_SIZE)
} else {
(self.data.len() as u32, compressed_data.len() as u32)
};
let lh_offset = if self.writer.writer.offset() > NON_ZIP64_MAX_SIZE as usize {
if self.writer.force_no_zip64 {
return Err(ZipError::Zip64Needed(Zip64ErrorCase::LargeFile));
}
if !self.writer.is_zip64 {
self.writer.is_zip64 = true;
}
if let Some(zip64_extra_field) = zip64_extra_field_builder {
zip64_extra_field_builder =
Some(zip64_extra_field.relative_header_offset(self.writer.writer.offset() as u64));
} else {
zip64_extra_field_builder = Some(
Zip64ExtendedInformationExtraFieldBuilder::new()
.relative_header_offset(self.writer.writer.offset() as u64),
);
}
NON_ZIP64_MAX_SIZE
} else {
self.writer.writer.offset() as u32
};
if let Some(builder) = zip64_extra_field_builder {
if !builder.eof_only() {
self.entry.extra_fields.push(ExtraField::Zip64ExtendedInformationExtraField(builder.build()?));
zip64_extra_field_builder = None;
} else {
zip64_extra_field_builder = Some(builder);
}
}
let lf_header = LocalFileHeader {
compressed_size: lfh_compressed_size,
uncompressed_size: lfh_uncompressed_size,
compression: self.entry.compression().into(),
crc: compute_crc(self.data),
extra_field_length: self
.entry
.extra_fields()
.count_bytes()
.try_into()
.map_err(|_| ZipError::ExtraFieldTooLarge)?,
file_name_length: self
.entry
.filename()
.as_bytes()
.len()
.try_into()
.map_err(|_| ZipError::FileNameTooLarge)?,
mod_time: self.entry.last_modification_date().time,
mod_date: self.entry.last_modification_date().date,
version: crate::spec::version::as_needed_to_extract(&self.entry),
flags: GeneralPurposeFlag {
data_descriptor: false,
encrypted: false,
filename_unicode: matches!(self.entry.filename().encoding(), StringEncoding::Utf8)
&& matches!(self.entry.comment().encoding(), StringEncoding::Utf8),
},
};
let mut header = CentralDirectoryRecord {
v_made_by: crate::spec::version::as_made_by(),
v_needed: lf_header.version,
compressed_size: lf_header.compressed_size,
uncompressed_size: lf_header.uncompressed_size,
compression: lf_header.compression,
crc: lf_header.crc,
extra_field_length: lf_header.extra_field_length,
file_name_length: lf_header.file_name_length,
file_comment_length: self
.entry
.comment()
.as_bytes()
.len()
.try_into()
.map_err(|_| ZipError::CommentTooLarge)?,
mod_time: lf_header.mod_time,
mod_date: lf_header.mod_date,
flags: lf_header.flags,
disk_start: 0,
inter_attr: self.entry.internal_file_attribute(),
exter_attr: self.entry.external_file_attribute(),
lh_offset,
};
self.writer.writer.write_all(&crate::spec::consts::LFH_SIGNATURE.to_le_bytes()).await?;
self.writer.writer.write_all(&lf_header.as_slice()).await?;
self.writer.writer.write_all(self.entry.filename().as_bytes()).await?;
self.writer.writer.write_all(&self.entry.extra_fields().as_bytes()).await?;
self.writer.writer.write_all(compressed_data).await?;
if let Some(builder) = zip64_extra_field_builder {
self.entry.extra_fields.push(ExtraField::Zip64ExtendedInformationExtraField(builder.build()?));
header.extra_field_length =
self.entry.extra_fields().count_bytes().try_into().map_err(|_| ZipError::ExtraFieldTooLarge)?;
}
self.writer.cd_entries.push(CentralDirectoryEntry { header, entry: self.entry });
if self.writer.cd_entries.len() > NON_ZIP64_MAX_NUM_FILES as usize {
if self.writer.force_no_zip64 {
return Err(ZipError::Zip64Needed(Zip64ErrorCase::TooManyFiles));
}
if !self.writer.is_zip64 {
self.writer.is_zip64 = true;
}
}
Ok(())
}
}
#[cfg(any(
feature = "deflate",
feature = "bzip2",
feature = "zstd",
feature = "lzma",
feature = "xz",
feature = "deflate64"
))]
async fn compress(compression: Compression, data: &[u8], level: async_compression::Level) -> Vec<u8> {
match compression {
#[cfg(feature = "deflate")]
Compression::Deflate => {
let mut writer = write::DeflateEncoder::with_quality(Cursor::new(Vec::new()), level);
writer.write_all(data).await.unwrap();
writer.close().await.unwrap();
writer.into_inner().into_inner()
}
#[cfg(feature = "deflate64")]
Compression::Deflate64 => panic!("compressing deflate64 is not supported"),
#[cfg(feature = "bzip2")]
Compression::Bz => {
let mut writer = write::BzEncoder::with_quality(Cursor::new(Vec::new()), level);
writer.write_all(data).await.unwrap();
writer.close().await.unwrap();
writer.into_inner().into_inner()
}
#[cfg(feature = "lzma")]
Compression::Lzma => {
let mut writer = write::LzmaEncoder::with_quality(Cursor::new(Vec::new()), level);
writer.write_all(data).await.unwrap();
writer.close().await.unwrap();
writer.into_inner().into_inner()
}
#[cfg(feature = "xz")]
Compression::Xz => {
let mut writer = write::XzEncoder::with_quality(Cursor::new(Vec::new()), level);
writer.write_all(data).await.unwrap();
writer.close().await.unwrap();
writer.into_inner().into_inner()
}
#[cfg(feature = "zstd")]
Compression::Zstd => {
let mut writer = write::ZstdEncoder::with_quality(Cursor::new(Vec::new()), level);
writer.write_all(data).await.unwrap();
writer.close().await.unwrap();
writer.into_inner().into_inner()
}
_ => unreachable!(),
}
}
fn compute_crc(data: &[u8]) -> u32 {
let mut hasher = Hasher::new();
hasher.update(data);
hasher.finalize()
}