mirror of
https://github.com/Dushistov/sdcv.git
synced 2025-12-15 17:31:56 +00:00
implement support of gziped index files
This commit is contained in:
Evgeniy A. Dushistov
30
Cargo.lock
generated
30
Cargo.lock
generated
@@ -3,8 +3,10 @@ name = "sdcv"
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version = "0.1.0"
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dependencies = [
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"byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"flate2 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"gettext 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"rust-ini 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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@@ -75,6 +77,20 @@ name = "encoding_index_tests"
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version = "0.1.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "flate2"
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version = "0.2.14"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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"miniz-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "gcc"
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version = "0.3.28"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "getopts"
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version = "0.2.14"
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@@ -89,11 +105,25 @@ dependencies = [
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"encoding 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "libc"
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version = "0.2.14"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "log"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "miniz-sys"
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version = "0.1.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"gcc 0.3.28 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "rust-ini"
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version = "0.9.5"
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@@ -7,4 +7,6 @@ authors = ["Evgeniy A. Dushistov <dushistov@mail.ru>"]
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getopts = "0.2"
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gettext = "0.2.0"
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rust-ini = "0.9.5"
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byteorder = "0.5"
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byteorder = "0.5"
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libc = "0.2.14"
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flate2 = "0.2"
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15
src/core.rs
15
src/core.rs
@@ -6,6 +6,7 @@ use std::path::PathBuf;
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use std::error::Error;
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use index::DictionaryIndex;
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use index::MemoryDictionaryIndex;
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use index::DiskDictionaryIndex;
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use data::DictionaryData;
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use data::SimpleDictionaryData;
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@@ -37,7 +38,7 @@ impl Dictionary {
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&ifo_content[0..]
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};
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let DICT_MAGIC_DATA = "StarDict's dict ifo file";
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static DICT_MAGIC_DATA: &'static str = "StarDict's dict ifo file";
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if !content.starts_with(DICT_MAGIC_DATA) {
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return Result::Err("ifo magic not match".to_string());
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}
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@@ -55,15 +56,11 @@ impl Dictionary {
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let idx_path_gz = dict_dir.join(basename.to_string() + ".idx.gz");
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let mut index: Box<DictionaryIndex>;
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if idx_path.exists() && idx_path.is_file() {
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let mut idx_file = try!(File::open(idx_path).map_err(|err| err.description().to_string()));
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let mut idx_content = Vec::<u8>::new();
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if let Result::Err(err) = idx_file.read_to_end(&mut idx_content) {
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return Result::Err(format!("Can not read index file: {}", err.description()));
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}
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let mem_dict = try!(MemoryDictionaryIndex::new(wordcount, idx_content));
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index = Box::new(mem_dict);
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let disk_dict = try!(DiskDictionaryIndex::new(wordcount, &idx_path));
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index = Box::new(disk_dict);
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} else if idx_path_gz.exists() && idx_path_gz.is_file() {
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return Result::Err("reading idx.gz not implemented".to_string());
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let mem_dict = try!(MemoryDictionaryIndex::new_from_gzip(wordcount, &idx_path_gz));
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index = Box::new(mem_dict);
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} else {
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return Result::Err(format!("no index file for {}", ifo_file_name.to_str().unwrap()));
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}
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@@ -26,7 +26,7 @@ impl DictionaryData for SimpleDictionaryData {
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impl SimpleDictionaryData {
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pub fn new(data_file_name: &Path) ->Result<SimpleDictionaryData, String> {
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let mut file = try!(File::open(data_file_name).map_err(|err| err.to_string()));
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let file = try!(File::open(data_file_name).map_err(|err| err.to_string()));
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Result::Ok(SimpleDictionaryData{data_file : file})
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}
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}
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137
src/index.rs
137
src/index.rs
@@ -2,6 +2,12 @@ use std::str::from_utf8;
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use std::cmp::Ordering;
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use std::io::Cursor;
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use byteorder::{NetworkEndian, ReadBytesExt};
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use mem_mapped_file::MemMappedFile;
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use std::path::Path;
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use std::fs::File;
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use std::io::Read;
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use flate2::read::GzDecoder;
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use std::error::Error;
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pub trait DictionaryIndex {
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fn get_key(&self, idx: usize) -> (&str, u64, usize);
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@@ -94,16 +100,16 @@ fn stardict_str_order(s1: &str, s2: &str) -> Ordering {
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}
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}
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fn get_key_by_offset(content: &Vec<u8>, key_pos: usize) -> (&str, u64, usize) {
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fn get_key_by_offset(content: &[u8], key_pos: usize) -> (&str, u64, usize) {
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let key = &content[key_pos..];
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let end_of_key = key.iter().position(|&x| x == b'\0').unwrap() + key_pos;
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let mut reader = Cursor::new(&content[end_of_key + 1..]);
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let mut reader = Cursor::new(&content[end_of_key + 1..]);
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let offset = reader.read_u32::<NetworkEndian>().unwrap() as u64;
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let length = reader.read_u32::<NetworkEndian>().unwrap() as usize;
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(from_utf8(&content[key_pos..end_of_key]).unwrap(), offset, length)
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}
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impl DictionaryIndex for MemoryDictionaryIndex {
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impl DictionaryIndex for MemoryDictionaryIndex {
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fn get_key(&self, idx: usize) -> (&str, u64, usize) {
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let key_pos = self.wordlist[idx];
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get_key_by_offset(&self.idx_content, key_pos)
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@@ -125,32 +131,78 @@ impl DictionaryIndex for MemoryDictionaryIndex {
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}
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}
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impl MemoryDictionaryIndex {
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pub fn new(expected_wordcount : usize, idx_content : Vec<u8>) -> Result<MemoryDictionaryIndex, String> {
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const PADDING_LENGTH: usize = 8;
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let mut wordlist = vec![];
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wordlist.reserve(expected_wordcount);
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{
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let mut slice = &idx_content[0..];
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let mut pos : usize = 0;
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while let Some(idx) = slice.iter().position(|&x| x == b'\0') {
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let (head, tail) = slice.split_at(idx);
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try!(from_utf8(head).map_err(|err| "invalid utf-8 in key".to_string()));
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wordlist.push(pos);
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pos += head.len() + PADDING_LENGTH + 1;
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// +1 to skip over the NUL
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if tail.len() > PADDING_LENGTH + 1 {
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slice = &tail[PADDING_LENGTH + 1..];
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} else {
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break;
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}
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fn get_offsets_of_phrases_in_index(expected_wordcount: usize, idx_content: &[u8]) -> Result<Vec<usize>, String> {
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const PADDING_LENGTH: usize = 8;
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let mut wordlist = vec![];
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wordlist.reserve(expected_wordcount);
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{
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let mut slice = idx_content;
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let mut pos : usize = 0;
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while let Some(idx) = slice.iter().position(|&x| x == b'\0') {
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let (head, tail) = slice.split_at(idx);
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try!(from_utf8(head).map_err(|err| "invalid utf-8 in key".to_string()));
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wordlist.push(pos);
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pos += head.len() + PADDING_LENGTH + 1;
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// +1 to skip over the NUL
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if tail.len() > PADDING_LENGTH + 1 {
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slice = &tail[PADDING_LENGTH + 1..];
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} else {
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break;
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}
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}
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if wordlist.len() != expected_wordcount {
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Result::Err(format!("Expect words in index {}, got {} words", expected_wordcount, wordlist.len()))
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} else {
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Result::Ok(MemoryDictionaryIndex {idx_content: idx_content, wordlist : wordlist})
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}
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if wordlist.len() != expected_wordcount {
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Result::Err(format!("Expect words in index {}, got {} words", expected_wordcount, wordlist.len()))
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} else {
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Result::Ok(wordlist)
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}
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}
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impl MemoryDictionaryIndex {
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pub fn new_from_vec(expected_wordcount: usize, idx_content: Vec<u8>) -> Result<MemoryDictionaryIndex, String> {
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let wordlist = try!(get_offsets_of_phrases_in_index(expected_wordcount, idx_content.as_slice()));
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Result::Ok(MemoryDictionaryIndex {idx_content: idx_content, wordlist: wordlist})
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}
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pub fn new_from_gzip(expected_wordcount: usize, idx_gz_file_path: &Path) -> Result<MemoryDictionaryIndex, String> {
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let mut idx_file = try!(File::open(idx_gz_file_path).map_err(|err| err.description().to_string()));
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let mut gzip_decoder = try!(GzDecoder::new(idx_file).map_err(|err| err.description().to_string()));
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let mut idx_content = Vec::<u8>::new();
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if let Result::Err(err) = gzip_decoder.read_to_end(&mut idx_content) {
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return Result::Err(format!("Can not read index file: {}", err.description()));
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}
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let wordlist = try!(get_offsets_of_phrases_in_index(expected_wordcount, idx_content.as_slice()));
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Result::Ok(MemoryDictionaryIndex {idx_content: idx_content, wordlist: wordlist})
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}
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}
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pub struct DiskDictionaryIndex {
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file_map: MemMappedFile,
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wordlist: Vec<usize>,
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}
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impl DictionaryIndex for DiskDictionaryIndex {
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fn get_key(&self, idx: usize) -> (&str, u64, usize) {
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let key_pos = self.wordlist[idx];
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let idx_content = self.file_map.get_chunk(0, self.file_map.len()).unwrap();
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get_key_by_offset(idx_content, key_pos)
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}
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fn count(&self) -> usize { self.wordlist.len() }
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fn find(&self, key: &str) -> Result<usize, usize> {
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let idx_content = self.file_map.get_chunk(0, self.file_map.len()).unwrap();
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self.wordlist.binary_search_by(
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|probe| stardict_str_order(get_key_by_offset(idx_content, *probe).0, key)
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)
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}
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}
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impl DiskDictionaryIndex {
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pub fn new(expected_wordcount: usize, idx_file_path: &Path) -> Result<DiskDictionaryIndex, String> {
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let file_map = try!(MemMappedFile::new(idx_file_path));
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let whole_map = try!(file_map.get_chunk(0, file_map.len()));
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let wordlist = try!(get_offsets_of_phrases_in_index(expected_wordcount, whole_map));
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Ok(DiskDictionaryIndex{file_map: file_map, wordlist: wordlist})
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}
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}
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@@ -165,14 +217,14 @@ mod test {
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use std::io::BufReader;
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use std::io::BufRead;
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use std::collections::HashSet;
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#[test]
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fn index_memory_open() {
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let idx_file_name = Path::new("tests/stardict-test_dict-2.4.2/test_dict.idx");
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let mut file = File::open(idx_file_name).unwrap();
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let mut idx_content = Vec::<u8>::new();
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file.read_to_end(&mut idx_content).unwrap();
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let mut index = MemoryDictionaryIndex::new(1, idx_content).unwrap();
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let mut index = MemoryDictionaryIndex::new_from_vec(1, idx_content).unwrap();
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assert_eq!(1_usize, index.count());
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assert_eq!("test", index.get_key(0).0);
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@@ -181,8 +233,13 @@ mod test {
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let mut idx_content = Vec::<u8>::new();
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file.read_to_end(&mut idx_content).unwrap();
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let index_size = 1671704_usize;
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let mut index = MemoryDictionaryIndex::new(index_size, idx_content).unwrap();
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assert_eq!(index_size, index.count());
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let mut mem_index = MemoryDictionaryIndex::new_from_vec(index_size, idx_content).unwrap();
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assert_eq!(index_size, mem_index.count());
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let mut disk_index = DiskDictionaryIndex::new(index_size, idx_file_name).unwrap();
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assert_eq!(index_size, disk_index.count());
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let mut gz_mem_index = MemoryDictionaryIndex::new_from_gzip(index_size,
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Path::new("tests/words_dic/stardict-words-2.4.2/words.idx.gz")).unwrap();
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assert_eq!(index_size, gz_mem_index.count());
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{
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let mut counter: usize = 0;
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let f = File::open("tests/words_dic/words.dummy").unwrap();
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@@ -193,13 +250,15 @@ mod test {
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dic_words.insert(l);
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}
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for i in 0..index.count() {
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let (key, _, _) = index.get_key(i);
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if !dic_words.contains(key) {
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panic!("no '{}'(len {}) idx {} in dic_words", key, key.len(), i);
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}
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match index.find(key) {
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Err(idx) => panic!("we search '{}', and not found err({})", key, idx),
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Ok(idx) => assert_eq!(idx, i),
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for index in [&mem_index as &DictionaryIndex, &disk_index as &DictionaryIndex, &gz_mem_index as &DictionaryIndex].iter() {
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let (key, _, _) = index.get_key(i);
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if !dic_words.contains(key) {
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panic!("no '{}'(len {}) idx {} in dic_words", key, key.len(), i);
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}
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match index.find(key) {
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Err(idx) => panic!("we search '{}', and not found err({})", key, idx),
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Ok(idx) => assert_eq!(idx, i),
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}
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}
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}
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}
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@@ -217,7 +276,7 @@ mod test {
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#[test]
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fn index_stardict_strcmp_big() {
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let mut exp_res_list = vec![];
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{
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{
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let f = File::open("tests/stardict_strcmp_test_data_cmp_exp.txt").unwrap();
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let mut file = BufReader::new(&f);
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for line in file.lines() {
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@@ -226,7 +285,7 @@ mod test {
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exp_res_list.push(exp_res);
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}
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}
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|
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|
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let f = File::open("tests/stardict_strcmp_test_data.txt").unwrap();
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let mut file = BufReader::new(&f);
|
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let mut prev_line : String = "".to_string();
|
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|
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@@ -2,10 +2,13 @@ extern crate getopts;
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extern crate gettext;
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extern crate ini;
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extern crate byteorder;
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extern crate libc;
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extern crate flate2;
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mod core;
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mod index;
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mod data;
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mod mem_mapped_file;
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use core::Dictionary;
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use std::env;
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@@ -20,7 +23,7 @@ struct Library {
|
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}
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impl Library {
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fn new(dict_dirs: &Vec<String>, dict_order_names: &Vec<String>, dict_disable_names: &Vec<String>) -> Result<Library, String> {
|
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fn new(dict_dirs: &[&Path], dict_order_names: &[String], dict_disable_names: &[String]) -> Result<Library, String> {
|
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let dicts = vec![Dictionary::new(Path::new("/home/evgeniy/.stardict/dic/stardict-Mueller7accentGPL-2.4.2/Mueller7accentGPL.ifo")).unwrap()];
|
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Ok(Library{dicts: dicts})
|
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}
|
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@@ -56,7 +59,7 @@ fn main() {
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print_usage(&program, opts);
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return;
|
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}
|
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let dict_dirs: Vec<String> = vec![];
|
||||
let dict_dirs = vec![Path::new("/tmp")];
|
||||
let dict_order_names: Vec<String> = vec![];
|
||||
let dict_disable_names: Vec<String> = vec![];
|
||||
let mut library = Library::new(&dict_dirs, &dict_order_names, &dict_disable_names).unwrap();
|
||||
|
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179
src/mem_mapped_file.rs
Normal file
179
src/mem_mapped_file.rs
Normal file
@@ -0,0 +1,179 @@
|
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use std::path::Path;
|
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use std::fs::File;
|
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use std::os::unix::io::AsRawFd;
|
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use std::ptr;
|
||||
use std::slice;
|
||||
|
||||
use libc::{c_void, c_int};
|
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use libc;
|
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|
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pub struct MemMappedFile {
|
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mem_addr: *const u8,
|
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length: usize,
|
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}
|
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|
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#[cfg(unix)]
|
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impl MemMappedFile {
|
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pub fn new(file_name: &Path) -> Result<MemMappedFile, String> {
|
||||
let file = try!(File::open(file_name).map_err(|err| err.to_string()));
|
||||
let metadata = try!(file.metadata().map_err(|err| err.to_string()));
|
||||
if !metadata.is_file() {
|
||||
return Err(format!("{} is not file", file_name.to_str().unwrap()));
|
||||
}
|
||||
let file_len = metadata.len();
|
||||
let fd = file.as_raw_fd();
|
||||
let addr: *const u8 = ptr::null();
|
||||
let res = unsafe {
|
||||
libc::mmap(addr as *mut c_void, file_len as libc::size_t, libc::PROT_READ, libc::MAP_SHARED,
|
||||
fd, 0)
|
||||
};
|
||||
if res == libc::MAP_FAILED {
|
||||
Err(format!("mmap for {} failed", file_name.to_str().unwrap()))
|
||||
} else {
|
||||
Ok(MemMappedFile{mem_addr: res as *mut u8, length: file_len as usize})
|
||||
}
|
||||
}
|
||||
|
||||
pub fn len(&self) -> usize { self.length }
|
||||
|
||||
pub fn get_chunk<'a>(&self, offset: usize, size: usize) -> Result<&'a[u8], String> {
|
||||
let end = offset + size;
|
||||
if end > self.length {
|
||||
return Err(format!("offset out of range from 0 to {}", self.length));
|
||||
}
|
||||
Ok(unsafe {slice::from_raw_parts(self.mem_addr.offset(offset as isize), size) })
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(unix)]
|
||||
impl Drop for MemMappedFile {
|
||||
fn drop(&mut self) {
|
||||
let res: c_int = unsafe {
|
||||
// `munmap` only panics due to logic errors
|
||||
libc::munmap(self.mem_addr as *mut c_void, self.length as libc::size_t)
|
||||
};
|
||||
if res == -1 {
|
||||
panic!("munmap return error");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod test {
|
||||
use super::*;
|
||||
use std::path::Path;
|
||||
use std::mem;
|
||||
use std::slice;
|
||||
|
||||
static CRCTAB: [u32; 256] = [
|
||||
0x00000000,
|
||||
0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
|
||||
0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6,
|
||||
0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
|
||||
0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
|
||||
0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f,
|
||||
0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a,
|
||||
0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
|
||||
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58,
|
||||
0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033,
|
||||
0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe,
|
||||
0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
|
||||
0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4,
|
||||
0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
|
||||
0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5,
|
||||
0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
|
||||
0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07,
|
||||
0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c,
|
||||
0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
|
||||
0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
|
||||
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b,
|
||||
0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698,
|
||||
0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d,
|
||||
0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
|
||||
0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f,
|
||||
0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
|
||||
0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80,
|
||||
0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
|
||||
0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a,
|
||||
0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629,
|
||||
0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c,
|
||||
0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
|
||||
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
|
||||
0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65,
|
||||
0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8,
|
||||
0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
|
||||
0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2,
|
||||
0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
|
||||
0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74,
|
||||
0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
|
||||
0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21,
|
||||
0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a,
|
||||
0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087,
|
||||
0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
|
||||
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d,
|
||||
0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce,
|
||||
0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
|
||||
0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
|
||||
0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09,
|
||||
0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
|
||||
0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf,
|
||||
0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
|
||||
];
|
||||
|
||||
fn crc32(buf: &[u32]) -> u32 {
|
||||
let mut crc = 0_u32;
|
||||
for item in buf {
|
||||
let mut byte: u32 = item & 0xFF_u32;
|
||||
crc = (crc << 8) ^ CRCTAB[(((crc >> 24) ^ byte) & 0xFF) as usize];
|
||||
|
||||
byte = (item >> 8) & 0xFF_u32;
|
||||
crc = (crc << 8) ^ CRCTAB[(((crc >> 24) ^ byte) & 0xFF) as usize];
|
||||
|
||||
byte = (item >> 16) & 0xFF_u32;
|
||||
crc = (crc << 8) ^ CRCTAB[(((crc >> 24) ^ byte) & 0xFF) as usize];
|
||||
|
||||
byte = (item >> 24) & 0xFF_u32;
|
||||
crc = (crc << 8) ^ CRCTAB[(((crc >> 24) ^ byte) & 0xFF) as usize];
|
||||
}
|
||||
!crc & 0xFFFFFFFF_u32
|
||||
}
|
||||
|
||||
|
||||
#[test]
|
||||
fn mem_mapped_file_basic_test() {
|
||||
let mfile = MemMappedFile::new(Path::new("tests/words_dic/stardict-words-2.4.2/words.idx")).unwrap();
|
||||
let mem_chunk = mfile.get_chunk(0, 16).unwrap();
|
||||
assert_eq!(mem_chunk.len(), 16);
|
||||
let exp : Vec<u8> = vec![0x21, 0, 0, 0, 0, 0, 0, 0, 0, 0xa, 0x21, 0x20, 0x23, 0x24, 0x25, 0x5e];
|
||||
assert_eq!(mem_chunk, exp.as_slice());
|
||||
|
||||
const CHUNK_SIZE: usize = 256;
|
||||
let n_chunks = (mfile.len() + CHUNK_SIZE -1) / CHUNK_SIZE;
|
||||
let mut data: Vec<u32> = Vec::with_capacity(mfile.len() / 4);
|
||||
for i in 0..(n_chunks - 1) {
|
||||
let mem_chunk = mfile.get_chunk(i * CHUNK_SIZE, CHUNK_SIZE).unwrap();
|
||||
let data_bytes = &mem_chunk[0] as *const u8;
|
||||
let data_words: *const u32 = unsafe { mem::transmute(data_bytes) };
|
||||
let chunk_u32_view = unsafe { slice::from_raw_parts(data_words, CHUNK_SIZE / 4) };
|
||||
data.extend_from_slice(chunk_u32_view);
|
||||
}
|
||||
let res_crc = crc32(data.as_slice());
|
||||
assert_eq!(res_crc, 0x2a04c834_u32);
|
||||
let rest = mfile.len() - (n_chunks - 1) * CHUNK_SIZE;
|
||||
if rest > 0 {
|
||||
let mem_chunk = mfile.get_chunk((n_chunks - 1) * CHUNK_SIZE, rest).unwrap();
|
||||
let add_size = (rest + 3) / 4;
|
||||
for i in 0..add_size {
|
||||
let mut word = 0_u32;
|
||||
for j in 0..4 {
|
||||
if i * 4 + j < mem_chunk.len() {
|
||||
word |= (mem_chunk[i * 4 + j] as u32) << (j * 8);
|
||||
}
|
||||
}
|
||||
data.push(word);
|
||||
}
|
||||
}
|
||||
let res_crc = crc32(data.as_slice());
|
||||
assert_eq!(res_crc, 0x6ae491df);
|
||||
}
|
||||
}
|
||||
BIN
tests/words_dic/stardict-words-2.4.2/words.idx.gz
Normal file
BIN
tests/words_dic/stardict-words-2.4.2/words.idx.gz
Normal file
Binary file not shown.
Reference in New Issue
Block a user