diff --git a/Cargo.lock b/Cargo.lock index a7b126d..e022b51 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -3,8 +3,10 @@ name = "sdcv" version = "0.1.0" dependencies = [ "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)", + "flate2 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)", "getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)", "gettext 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)", + "libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)", "rust-ini 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)", ] @@ -75,6 +77,20 @@ name = "encoding_index_tests" version = "0.1.4" source = "registry+https://github.com/rust-lang/crates.io-index" +[[package]] +name = "flate2" +version = "0.2.14" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)", + "miniz-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)", +] + +[[package]] +name = "gcc" +version = "0.3.28" +source = "registry+https://github.com/rust-lang/crates.io-index" + [[package]] name = "getopts" version = "0.2.14" @@ -89,11 +105,25 @@ dependencies = [ "encoding 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)", ] +[[package]] +name = "libc" +version = "0.2.14" +source = "registry+https://github.com/rust-lang/crates.io-index" + [[package]] name = "log" version = "0.3.6" source = "registry+https://github.com/rust-lang/crates.io-index" +[[package]] +name = "miniz-sys" +version = "0.1.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "gcc 0.3.28 (registry+https://github.com/rust-lang/crates.io-index)", + "libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)", +] + [[package]] name = "rust-ini" version = "0.9.5" diff --git a/Cargo.toml b/Cargo.toml index 59ce8c9..4a8e44d 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -7,4 +7,6 @@ authors = ["Evgeniy A. Dushistov "] getopts = "0.2" gettext = "0.2.0" rust-ini = "0.9.5" -byteorder = "0.5" \ No newline at end of file +byteorder = "0.5" +libc = "0.2.14" +flate2 = "0.2" \ No newline at end of file diff --git a/src/core.rs b/src/core.rs index 267d349..865a610 100644 --- a/src/core.rs +++ b/src/core.rs @@ -6,6 +6,7 @@ use std::path::PathBuf; use std::error::Error; use index::DictionaryIndex; use index::MemoryDictionaryIndex; +use index::DiskDictionaryIndex; use data::DictionaryData; use data::SimpleDictionaryData; @@ -37,7 +38,7 @@ impl Dictionary { &ifo_content[0..] }; - let DICT_MAGIC_DATA = "StarDict's dict ifo file"; + static DICT_MAGIC_DATA: &'static str = "StarDict's dict ifo file"; if !content.starts_with(DICT_MAGIC_DATA) { return Result::Err("ifo magic not match".to_string()); } @@ -55,15 +56,11 @@ impl Dictionary { let idx_path_gz = dict_dir.join(basename.to_string() + ".idx.gz"); let mut index: Box; if idx_path.exists() && idx_path.is_file() { - let mut idx_file = try!(File::open(idx_path).map_err(|err| err.description().to_string())); - let mut idx_content = Vec::::new(); - if let Result::Err(err) = idx_file.read_to_end(&mut idx_content) { - return Result::Err(format!("Can not read index file: {}", err.description())); - } - let mem_dict = try!(MemoryDictionaryIndex::new(wordcount, idx_content)); - index = Box::new(mem_dict); + let disk_dict = try!(DiskDictionaryIndex::new(wordcount, &idx_path)); + index = Box::new(disk_dict); } else if idx_path_gz.exists() && idx_path_gz.is_file() { - return Result::Err("reading idx.gz not implemented".to_string()); + let mem_dict = try!(MemoryDictionaryIndex::new_from_gzip(wordcount, &idx_path_gz)); + index = Box::new(mem_dict); } else { return Result::Err(format!("no index file for {}", ifo_file_name.to_str().unwrap())); } diff --git a/src/data.rs b/src/data.rs index 23f219c..f800c44 100644 --- a/src/data.rs +++ b/src/data.rs @@ -26,7 +26,7 @@ impl DictionaryData for SimpleDictionaryData { impl SimpleDictionaryData { pub fn new(data_file_name: &Path) ->Result { - let mut file = try!(File::open(data_file_name).map_err(|err| err.to_string())); + let file = try!(File::open(data_file_name).map_err(|err| err.to_string())); Result::Ok(SimpleDictionaryData{data_file : file}) } } diff --git a/src/index.rs b/src/index.rs index ea63334..06a66a5 100644 --- a/src/index.rs +++ b/src/index.rs @@ -2,6 +2,12 @@ use std::str::from_utf8; use std::cmp::Ordering; use std::io::Cursor; use byteorder::{NetworkEndian, ReadBytesExt}; +use mem_mapped_file::MemMappedFile; +use std::path::Path; +use std::fs::File; +use std::io::Read; +use flate2::read::GzDecoder; +use std::error::Error; pub trait DictionaryIndex { fn get_key(&self, idx: usize) -> (&str, u64, usize); @@ -94,16 +100,16 @@ fn stardict_str_order(s1: &str, s2: &str) -> Ordering { } } -fn get_key_by_offset(content: &Vec, key_pos: usize) -> (&str, u64, usize) { +fn get_key_by_offset(content: &[u8], key_pos: usize) -> (&str, u64, usize) { let key = &content[key_pos..]; let end_of_key = key.iter().position(|&x| x == b'\0').unwrap() + key_pos; - let mut reader = Cursor::new(&content[end_of_key + 1..]); + let mut reader = Cursor::new(&content[end_of_key + 1..]); let offset = reader.read_u32::().unwrap() as u64; let length = reader.read_u32::().unwrap() as usize; (from_utf8(&content[key_pos..end_of_key]).unwrap(), offset, length) } -impl DictionaryIndex for MemoryDictionaryIndex { +impl DictionaryIndex for MemoryDictionaryIndex { fn get_key(&self, idx: usize) -> (&str, u64, usize) { let key_pos = self.wordlist[idx]; get_key_by_offset(&self.idx_content, key_pos) @@ -125,32 +131,78 @@ impl DictionaryIndex for MemoryDictionaryIndex { } } -impl MemoryDictionaryIndex { - pub fn new(expected_wordcount : usize, idx_content : Vec) -> Result { - const PADDING_LENGTH: usize = 8; - let mut wordlist = vec![]; - wordlist.reserve(expected_wordcount); - { - let mut slice = &idx_content[0..]; - let mut pos : usize = 0; - while let Some(idx) = slice.iter().position(|&x| x == b'\0') { - let (head, tail) = slice.split_at(idx); - try!(from_utf8(head).map_err(|err| "invalid utf-8 in key".to_string())); - wordlist.push(pos); - pos += head.len() + PADDING_LENGTH + 1; - // +1 to skip over the NUL - if tail.len() > PADDING_LENGTH + 1 { - slice = &tail[PADDING_LENGTH + 1..]; - } else { - break; - } +fn get_offsets_of_phrases_in_index(expected_wordcount: usize, idx_content: &[u8]) -> Result, String> { + const PADDING_LENGTH: usize = 8; + let mut wordlist = vec![]; + wordlist.reserve(expected_wordcount); + { + let mut slice = idx_content; + let mut pos : usize = 0; + while let Some(idx) = slice.iter().position(|&x| x == b'\0') { + let (head, tail) = slice.split_at(idx); + try!(from_utf8(head).map_err(|err| "invalid utf-8 in key".to_string())); + wordlist.push(pos); + pos += head.len() + PADDING_LENGTH + 1; + // +1 to skip over the NUL + if tail.len() > PADDING_LENGTH + 1 { + slice = &tail[PADDING_LENGTH + 1..]; + } else { + break; } } - if wordlist.len() != expected_wordcount { - Result::Err(format!("Expect words in index {}, got {} words", expected_wordcount, wordlist.len())) - } else { - Result::Ok(MemoryDictionaryIndex {idx_content: idx_content, wordlist : wordlist}) + } + if wordlist.len() != expected_wordcount { + Result::Err(format!("Expect words in index {}, got {} words", expected_wordcount, wordlist.len())) + } else { + Result::Ok(wordlist) + } +} + +impl MemoryDictionaryIndex { + pub fn new_from_vec(expected_wordcount: usize, idx_content: Vec) -> Result { + let wordlist = try!(get_offsets_of_phrases_in_index(expected_wordcount, idx_content.as_slice())); + Result::Ok(MemoryDictionaryIndex {idx_content: idx_content, wordlist: wordlist}) + } + + pub fn new_from_gzip(expected_wordcount: usize, idx_gz_file_path: &Path) -> Result { + let mut idx_file = try!(File::open(idx_gz_file_path).map_err(|err| err.description().to_string())); + let mut gzip_decoder = try!(GzDecoder::new(idx_file).map_err(|err| err.description().to_string())); + let mut idx_content = Vec::::new(); + if let Result::Err(err) = gzip_decoder.read_to_end(&mut idx_content) { + return Result::Err(format!("Can not read index file: {}", err.description())); } + let wordlist = try!(get_offsets_of_phrases_in_index(expected_wordcount, idx_content.as_slice())); + Result::Ok(MemoryDictionaryIndex {idx_content: idx_content, wordlist: wordlist}) + } +} + +pub struct DiskDictionaryIndex { + file_map: MemMappedFile, + wordlist: Vec, +} + +impl DictionaryIndex for DiskDictionaryIndex { + fn get_key(&self, idx: usize) -> (&str, u64, usize) { + let key_pos = self.wordlist[idx]; + let idx_content = self.file_map.get_chunk(0, self.file_map.len()).unwrap(); + get_key_by_offset(idx_content, key_pos) + } + fn count(&self) -> usize { self.wordlist.len() } + + fn find(&self, key: &str) -> Result { + let idx_content = self.file_map.get_chunk(0, self.file_map.len()).unwrap(); + self.wordlist.binary_search_by( + |probe| stardict_str_order(get_key_by_offset(idx_content, *probe).0, key) + ) + } +} + +impl DiskDictionaryIndex { + pub fn new(expected_wordcount: usize, idx_file_path: &Path) -> Result { + let file_map = try!(MemMappedFile::new(idx_file_path)); + let whole_map = try!(file_map.get_chunk(0, file_map.len())); + let wordlist = try!(get_offsets_of_phrases_in_index(expected_wordcount, whole_map)); + Ok(DiskDictionaryIndex{file_map: file_map, wordlist: wordlist}) } } @@ -165,14 +217,14 @@ mod test { use std::io::BufReader; use std::io::BufRead; use std::collections::HashSet; - + #[test] fn index_memory_open() { let idx_file_name = Path::new("tests/stardict-test_dict-2.4.2/test_dict.idx"); let mut file = File::open(idx_file_name).unwrap(); let mut idx_content = Vec::::new(); file.read_to_end(&mut idx_content).unwrap(); - let mut index = MemoryDictionaryIndex::new(1, idx_content).unwrap(); + let mut index = MemoryDictionaryIndex::new_from_vec(1, idx_content).unwrap(); assert_eq!(1_usize, index.count()); assert_eq!("test", index.get_key(0).0); @@ -181,8 +233,13 @@ mod test { let mut idx_content = Vec::::new(); file.read_to_end(&mut idx_content).unwrap(); let index_size = 1671704_usize; - let mut index = MemoryDictionaryIndex::new(index_size, idx_content).unwrap(); - assert_eq!(index_size, index.count()); + let mut mem_index = MemoryDictionaryIndex::new_from_vec(index_size, idx_content).unwrap(); + assert_eq!(index_size, mem_index.count()); + let mut disk_index = DiskDictionaryIndex::new(index_size, idx_file_name).unwrap(); + assert_eq!(index_size, disk_index.count()); + let mut gz_mem_index = MemoryDictionaryIndex::new_from_gzip(index_size, + Path::new("tests/words_dic/stardict-words-2.4.2/words.idx.gz")).unwrap(); + assert_eq!(index_size, gz_mem_index.count()); { let mut counter: usize = 0; let f = File::open("tests/words_dic/words.dummy").unwrap(); @@ -193,13 +250,15 @@ mod test { dic_words.insert(l); } for i in 0..index.count() { - let (key, _, _) = index.get_key(i); - if !dic_words.contains(key) { - panic!("no '{}'(len {}) idx {} in dic_words", key, key.len(), i); - } - match index.find(key) { - Err(idx) => panic!("we search '{}', and not found err({})", key, idx), - Ok(idx) => assert_eq!(idx, i), + for index in [&mem_index as &DictionaryIndex, &disk_index as &DictionaryIndex, &gz_mem_index as &DictionaryIndex].iter() { + let (key, _, _) = index.get_key(i); + if !dic_words.contains(key) { + panic!("no '{}'(len {}) idx {} in dic_words", key, key.len(), i); + } + match index.find(key) { + Err(idx) => panic!("we search '{}', and not found err({})", key, idx), + Ok(idx) => assert_eq!(idx, i), + } } } } @@ -217,7 +276,7 @@ mod test { #[test] fn index_stardict_strcmp_big() { let mut exp_res_list = vec![]; - { + { let f = File::open("tests/stardict_strcmp_test_data_cmp_exp.txt").unwrap(); let mut file = BufReader::new(&f); for line in file.lines() { @@ -226,7 +285,7 @@ mod test { exp_res_list.push(exp_res); } } - + let f = File::open("tests/stardict_strcmp_test_data.txt").unwrap(); let mut file = BufReader::new(&f); let mut prev_line : String = "".to_string(); diff --git a/src/main.rs b/src/main.rs index 35813bd..3de3e4e 100644 --- a/src/main.rs +++ b/src/main.rs @@ -2,10 +2,13 @@ extern crate getopts; extern crate gettext; extern crate ini; extern crate byteorder; +extern crate libc; +extern crate flate2; mod core; mod index; mod data; +mod mem_mapped_file; use core::Dictionary; use std::env; @@ -20,7 +23,7 @@ struct Library { } impl Library { - fn new(dict_dirs: &Vec, dict_order_names: &Vec, dict_disable_names: &Vec) -> Result { + fn new(dict_dirs: &[&Path], dict_order_names: &[String], dict_disable_names: &[String]) -> Result { let dicts = vec![Dictionary::new(Path::new("/home/evgeniy/.stardict/dic/stardict-Mueller7accentGPL-2.4.2/Mueller7accentGPL.ifo")).unwrap()]; Ok(Library{dicts: dicts}) } @@ -56,7 +59,7 @@ fn main() { print_usage(&program, opts); return; } - let dict_dirs: Vec = vec![]; + let dict_dirs = vec![Path::new("/tmp")]; let dict_order_names: Vec = vec![]; let dict_disable_names: Vec = vec![]; let mut library = Library::new(&dict_dirs, &dict_order_names, &dict_disable_names).unwrap(); diff --git a/src/mem_mapped_file.rs b/src/mem_mapped_file.rs new file mode 100644 index 0000000..b407c09 --- /dev/null +++ b/src/mem_mapped_file.rs @@ -0,0 +1,179 @@ +use std::path::Path; +use std::fs::File; +use std::os::unix::io::AsRawFd; +use std::ptr; +use std::slice; + +use libc::{c_void, c_int}; +use libc; + +pub struct MemMappedFile { + mem_addr: *const u8, + length: usize, +} + +#[cfg(unix)] +impl MemMappedFile { + pub fn new(file_name: &Path) -> Result { + 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 = 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 = 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); + } +} diff --git a/tests/words_dic/stardict-words-2.4.2/words.idx.gz b/tests/words_dic/stardict-words-2.4.2/words.idx.gz new file mode 100644 index 0000000..b77d89e Binary files /dev/null and b/tests/words_dic/stardict-words-2.4.2/words.idx.gz differ