Crate delharc[−][src]
A library for parsing and extracting content of LHA/LZH archives.
This library is for easy parsing of LHA headers and allows to read files compressed with some of the methods used by the archive format.
This library does not provide high level methods for creating files or directories from the extracted archives.
There are many extensions to the base LHA headers, used by many different archive programs, in many different operating systems. This library only allows for parsing some basic properties of the archived files, such as file path names and last modification timestamps.
The LhaHeader exposes properties and methods to inspect the raw content of header extensions, as well as extended header data and may be explored by the user program in case extra archive properties are needed to be read.
LHA header levels: 0, 1, 2 and 3 are recognized.
Compression methods
You may include or opt out of some of the decoders:
[dependencies.delharc]
version = "0.2"
default-features = false
features = ["lh1"] # select desired features
lh1
and lz
features are enabled by default.
identifier | decoder | feature | description |
---|---|---|---|
-lh0- | PassthroughDecoder | no compression | |
-lh1- | Lh1Decoder | lh1 | LHarc version 1, 4kB sliding window, dynamic huffman |
-lh4- | Lh5Decoder | LHarc version 2, 4kB sliding window, static huffman | |
-lh5- | Lh5Decoder | LHarc version 2, 8kB sliding window, static huffman | |
-lh6- | Lh7Decoder | LHarc version 2, 32kB sliding window, static huffman | |
-lh7- | Lh7Decoder | LHarc version 2, 64kB sliding window, static huffman | |
-lhd- | unsupported | an empty directory, data should be empty and should be skipped | |
-lhx- | LhxDecoder | lhx | UNLHA32.DLL method, 128-512kb sliding window, static huffman |
-lz4- | PassthroughDecoder | no compression | |
-lzs- | LzsDecoder | lz | LArc, 2kb sliding window |
-lz5- | Lz5Decoder | lz | LArc, 4kb sliding window |
-pm0- | PassthroughDecoder | no compression | |
-pm1- | unsupported | N/A | PMarc, 8 Kb sliding window, static huffman |
-pm2- | unsupported | N/A | PMarc, 4 Kb sliding window, static huffman |
Example
use std::{io, path::Path}; fn extract_to_stdout<P: AsRef<Path>>( archive_name: P, matching_path: P ) -> io::Result<bool> { let mut lha_reader = delharc::parse_file(archive_name.as_ref())?; loop { let header = lha_reader.header(); let filename = header.parse_pathname(); eprintln!("Path: {:?} modified: {} ", filename, header.parse_last_modified()); if filename.ends_with(matching_path.as_ref()) { if lha_reader.is_decoder_supported() { let stdout = io::stdout(); let mut handle = stdout.lock(); io::copy(&mut lha_reader, &mut handle)?; lha_reader.crc_check()?; return Ok(true) } else if header.is_directory() { eprintln!("skipping: an empty directory"); } else { eprintln!("skipping: has unsupported compression method"); } } if !lha_reader.next_file()? { break; } } Ok(false) }
Re-exports
pub use decode::LhaDecodeReader; |
pub use header::LhaHeader; |
Modules
crc | An implementation of CRC-16. |
decode | Decoding algorithms. |
header | LHA header and related types. |
Structs
MsDosAttrs |
Enums
CompressionMethod | |
OsType | |
TimestampResult | The type returned when parsing last modified timestamp. |
Functions
parse_file | Attempts to open a file from a filesystem in read-only mode and on success returns an instance of LhaDecodeReader with the first parsed LHA file header, ready to decode the content of the first archived file. |