DevComp/zip-rs-wasm
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Add comments to write.rs

Browse source 
Clarify which field means what when writing structures
This commit is contained in:
Mathijs van de Nes 2016-10-29 12:30:59 +02:00
parent 49e506c13c
commit 82315c9511
1 changed files with 32 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

32
src/write.rs
View file

@ -321,22 +321,34 @@ impl<W: Write+io::Seek> GenericZipWriter<W>
fn write_local_file_header<T: Write>(writer: &mut T, file: &ZipFileData) -> ZipResult<()>
{
// local file header signature
try!(writer.write_u32::<LittleEndian>(spec::LOCAL_FILE_HEADER_SIGNATURE));
// version needed to extract
let version_made_by = (file.system as u16) << 8 | (file.version_made_by as u16);
try!(writer.write_u16::<LittleEndian>(version_made_by));
// general purpose bit flag
let flag = if !file.file_name.is_ascii() { 1u16 << 11 } else { 0 };
try!(writer.write_u16::<LittleEndian>(flag));
// Compression method
try!(writer.write_u16::<LittleEndian>(file.compression_method.to_u16()));
// last mod file time and last mod file date
let msdos_datetime = try!(file.last_modified_time.to_msdos());
try!(writer.write_u16::<LittleEndian>(msdos_datetime.timepart));
try!(writer.write_u16::<LittleEndian>(msdos_datetime.datepart));
// crc-32
try!(writer.write_u32::<LittleEndian>(file.crc32));
// compressed size
try!(writer.write_u32::<LittleEndian>(file.compressed_size as u32));
// uncompressed size
try!(writer.write_u32::<LittleEndian>(file.uncompressed_size as u32));
// file name length
try!(writer.write_u16::<LittleEndian>(file.file_name.as_bytes().len() as u16));
// extra field length
let extra_field = try!(build_extra_field(file));
try!(writer.write_u16::<LittleEndian>(extra_field.len() as u16));
// file name
try!(writer.write_all(file.file_name.as_bytes()));
// extra field
try!(writer.write_all(&extra_field));
Ok(())
@ -354,28 +366,48 @@ fn update_local_file_header<T: Write+io::Seek>(writer: &mut T, file: &ZipFileDat
fn write_central_directory_header<T: Write>(writer: &mut T, file: &ZipFileData) -> ZipResult<()>
{
// central file header signature
try!(writer.write_u32::<LittleEndian>(spec::CENTRAL_DIRECTORY_HEADER_SIGNATURE));
// version made by
try!(writer.write_u16::<LittleEndian>(0x14FF));
// version needed to extract
try!(writer.write_u16::<LittleEndian>(20));
// general puprose bit flag
let flag = if !file.file_name.is_ascii() { 1u16 << 11 } else { 0 };
try!(writer.write_u16::<LittleEndian>(flag));
// compression method
try!(writer.write_u16::<LittleEndian>(file.compression_method.to_u16()));
// last mod file time + date
let msdos_datetime = try!(file.last_modified_time.to_msdos());
try!(writer.write_u16::<LittleEndian>(msdos_datetime.timepart));
try!(writer.write_u16::<LittleEndian>(msdos_datetime.datepart));
// crc-32
try!(writer.write_u32::<LittleEndian>(file.crc32));
// compressed size
try!(writer.write_u32::<LittleEndian>(file.compressed_size as u32));
// uncompressed size
try!(writer.write_u32::<LittleEndian>(file.uncompressed_size as u32));
// file name length
try!(writer.write_u16::<LittleEndian>(file.file_name.as_bytes().len() as u16));
// extra field length
let extra_field = try!(build_extra_field(file));
try!(writer.write_u16::<LittleEndian>(extra_field.len() as u16));
// file comment length
try!(writer.write_u16::<LittleEndian>(0));
// disk number start
try!(writer.write_u16::<LittleEndian>(0));
// internal file attribytes
try!(writer.write_u16::<LittleEndian>(0));
// external file attributes
try!(writer.write_u32::<LittleEndian>(0));
// relative offset of local header
try!(writer.write_u32::<LittleEndian>(file.header_start as u32));
// file name
try!(writer.write_all(file.file_name.as_bytes()));
// extra field
try!(writer.write_all(&extra_field));
// file comment
// <none>
Ok(())
}