118 lines
3.3 KiB
Rust
118 lines
3.3 KiB
Rust
extern crate encoding;
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extern crate textstream;
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extern crate zip;
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use encoding::all::{KOI8_R, UTF_8};
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use encoding::Encoding;
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use encoding::{DecoderTrap, EncoderTrap};
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use std::io::{Read, Seek, Write};
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use std::path::PathBuf;
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use std::{fs, io};
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use textstream::TextReader;
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use zip::write::FileOptions;
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use zip::ZipWriter;
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const INPUT_FILENAME: &str = "baza.zip";
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const OUTPUT_FILENAME: &str = "baza_utf8.zip";
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struct OutFileDescr<'a> {
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name: String,
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options: &'a FileOptions,
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encoding: &'a dyn Encoding,
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trap: EncoderTrap,
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}
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fn read_file(file: impl Read, enc: &dyn Encoding) -> Result<String, Box<dyn std::error::Error>> {
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let buf = io::BufReader::new(file);
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let mut reader = TextReader::new(buf, enc, DecoderTrap::Ignore);
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let mut result = String::new();
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reader.read_to_end(&mut result).or(Err("decode error"))?;
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Ok(result)
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}
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fn write_file<T: Seek + Write>(
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arc: &mut ZipWriter<T>,
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f: OutFileDescr,
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data: String,
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) -> Result<(), Box<dyn std::error::Error>> {
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arc.start_file(f.name, *f.options)?;
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let data = f.encoding.encode(data.as_str(), f.trap)?;
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arc.write_all(&data)?;
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Ok(())
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}
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fn process_files<R: Read + Seek>(
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archive: &mut zip::ZipArchive<R>,
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files: &[PathBuf],
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) -> Result<(), Box<dyn std::error::Error>> {
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if files.is_empty() {
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return Ok(());
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}
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let enc_input = KOI8_R;
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let enc_output = UTF_8;
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let options = zip::write::FileOptions::default()
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.compression_method(zip::CompressionMethod::Deflated)
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.compression_level(Some(9));
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let file_def = OutFileDescr {
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name: String::new(),
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options: &options,
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encoding: enc_output,
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trap: EncoderTrap::Ignore,
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};
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let mut outfile = fs::File::create(OUTPUT_FILENAME)?;
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let mut zip_writer = ZipWriter::new(&mut outfile);
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for name in files {
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let name_str = name.to_str().ok_or("name to str err")?;
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// read string from file in input zip
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let file = archive.by_name(name_str)?;
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let data = read_file(file, enc_input)?;
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// write string to file in output zip
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let out_file = OutFileDescr {
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name: name_str.to_string(),
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..file_def
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};
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write_file(&mut zip_writer, out_file, data)?;
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}
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zip_writer.finish()?;
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Ok(())
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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// open archive just to list files
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let zip_file = fs::File::open(INPUT_FILENAME)?;
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let zip_reader = io::BufReader::new(zip_file);
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let mut archive = zip::ZipArchive::new(zip_reader)?;
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let mut source_files: Vec<PathBuf> = (0..archive.len())
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.map(|i| archive.by_index(i).unwrap().mangled_name())
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.filter(|name| {
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// skip files without "txt" extension
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match name.extension() {
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Some(ext) => match ext.to_str() {
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Some(ext_str) => ext_str.eq_ignore_ascii_case("txt"),
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_ => false, // extension is not valid unicode or not txt
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},
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_ => false, // no extension in filename
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}
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})
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.collect();
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println!("processing {} files...", source_files.len());
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source_files.sort();
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let source_files = source_files;
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process_files(&mut archive, &source_files)?;
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println!("done");
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Ok(())
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}
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