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Calculate data_start after parse_extra_field

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Some extra fields may alter offsets, e.g. Zip64.
This commit is contained in:
Mathijs van de Nes 2018-06-17 15:23:19 +02:00
parent d2ccfc16f7
commit 86d9d20884
1 changed files with 18 additions and 18 deletions
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36
src/read.rs
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@ -344,23 +344,6 @@ fn central_header_to_zip_file<R: Read+io::Seek>(reader: &mut R, archive_offset:
false => file_comment_raw.from_cp437(),
};
// Remember end of central header
let return_position = try!(reader.seek(io::SeekFrom::Current(0)));
// Parse local header
try!(reader.seek(io::SeekFrom::Start(offset)));
let signature = try!(reader.read_u32::<LittleEndian>());
if signature != spec::LOCAL_FILE_HEADER_SIGNATURE
{
return Err(ZipError::InvalidArchive("Invalid local file header"))
}
try!(reader.seek(io::SeekFrom::Current(22)));
let file_name_length = try!(reader.read_u16::<LittleEndian>()) as u64;
let extra_field_length = try!(reader.read_u16::<LittleEndian>()) as u64;
let magic_and_header = 4 + 22 + 2 + 2;
let data_start = offset + magic_and_header + file_name_length + extra_field_length;
// Construct the result
let mut result = ZipFileData
{
@ -376,7 +359,7 @@ fn central_header_to_zip_file<R: Read+io::Seek>(reader: &mut R, archive_offset:
file_name_raw: file_name_raw,
file_comment: file_comment,
header_start: offset,
data_start: data_start,
data_start: 0,
external_attributes: external_file_attributes,
};
@ -385,6 +368,23 @@ fn central_header_to_zip_file<R: Read+io::Seek>(reader: &mut R, archive_offset:
Err(e) => try!(Err(e)),
}
// Remember end of central header
let return_position = try!(reader.seek(io::SeekFrom::Current(0)));
// Parse local header
try!(reader.seek(io::SeekFrom::Start(result.header_start)));
let signature = try!(reader.read_u32::<LittleEndian>());
if signature != spec::LOCAL_FILE_HEADER_SIGNATURE
{
return Err(ZipError::InvalidArchive("Invalid local file header"))
}
try!(reader.seek(io::SeekFrom::Current(22)));
let file_name_length = try!(reader.read_u16::<LittleEndian>()) as u64;
let extra_field_length = try!(reader.read_u16::<LittleEndian>()) as u64;
let magic_and_header = 4 + 22 + 2 + 2;
result.data_start = result.header_start + magic_and_header + file_name_length + extra_field_length;
// Go back after the central header
try!(reader.seek(io::SeekFrom::Start(return_position)));