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202 lines
7.1 KiB
202 lines
7.1 KiB
// Copyright 2015 Drew Short <drew@sothr.com>.
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//
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// Licensed under the MIT license<LICENSE-MIT or http://opensource.org/licenses/MIT>.
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// This file may not be copied, modified, or distributed except according to those terms.
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extern crate image;
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extern crate sha1;
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extern crate flate2;
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use self::image::ImageBuffer;
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use self::sha1::Sha1;
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use self::flate2::Compression;
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use self::flate2::write::ZlibEncoder;
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use self::flate2::read::ZlibDecoder;
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use std::str::FromStr;
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use std::path::Path;
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use std::fs::{File, create_dir_all, remove_dir_all};
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use std::io::{Read, Error, Write};
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use std::option::Option;
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use std::result::Result;
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const CACHE_DIR: &'static str = "./.hash_cache";
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const CACHE_FILE_EXT: &'static str = "png";
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// Creates the required directories
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pub fn prep_cache() -> Result<(), Error> {
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create_dir_all(CACHE_DIR)
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}
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pub fn clear_cache() -> Result<(), Error> {
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remove_dir_all(CACHE_DIR)
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}
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/**
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* Get the hash of the desired file and return it as a hex string
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*/
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fn get_file_hash(path: &Path) -> Result<String, Error> {
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let mut source = try!(File::open(&path));
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let mut buf: Vec<u8> = Vec::new();
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try!(source.read_to_end(&mut buf));
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let mut sha1 = Sha1::new();
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sha1.update(&buf);
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// Return the hex result of the hash
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Ok(sha1.hexdigest())
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}
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/**
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* Put an image buffer in the cache
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*/
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pub fn put_image_in_cache(path: &Path, size: u32, image: &ImageBuffer<image::Luma<u8>, Vec<u8>>) {
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let hash = get_file_hash(&path);
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match hash {
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Ok(sha1) => {
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let cache_path_str = format!("{}/{}x{}_{}.{}",
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CACHE_DIR,
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size,
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size,
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sha1,
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CACHE_FILE_EXT);
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let cached_path = Path::new(&cache_path_str);
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// Save the file into the cache
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match image.save(cached_path) {
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Ok(_) => {}
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Err(e) => println!("Error: {}", e),
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}
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}
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Err(e) => println!("Error: {}", e),
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}
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}
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/**
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* Expects a slice of slices that represents lines in the file
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*/
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pub fn put_matrix_in_cache(path: &Path,
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size: u32,
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extension: &str,
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file_contents: &Vec<Vec<f64>>) {
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let hash = get_file_hash(&path);
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match hash {
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Ok(sha1) => {
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let cache_path_str = format!("{}/{}x{}_{}.{}", CACHE_DIR, size, size, sha1, extension);
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let cached_path = Path::new(&cache_path_str);
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// Save the file into the cache
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match File::create(&cached_path) {
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Ok(mut file) => {
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let mut compressor = ZlibEncoder::new(Vec::new(), Compression::Default);
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for row in file_contents {
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let mut row_str = row.iter().fold(String::new(),
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|acc, &item| acc + &format!("{},", item));
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// remove the last comma
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let desire_len = row_str.len() - 1;
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row_str.truncate(desire_len);
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row_str.push_str("\n");
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compressor.write(&row_str.into_bytes());
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}
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let compressed_matrix = match compressor.finish() {
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Ok(data) => data,
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Err(e) => { println!("Unable to compress matrix data: {}", e); return },
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};
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file.write(&compressed_matrix);
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file.flush();
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}
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Err(_) => {}
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}
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}
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Err(e) => println!("Error: {}", e),
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}
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}
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/**
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* Get an image buffer out of the cache
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*/
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pub fn get_image_from_cache(path: &Path,
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size: u32)
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-> Option<ImageBuffer<image::Luma<u8>, Vec<u8>>> {
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let hash = get_file_hash(&path);
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match hash {
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Ok(sha1) => {
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// Check if the file exists in the cache
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let cache_path_str = format!("{}/{}x{}_{}.{}",
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CACHE_DIR,
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size,
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size,
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sha1,
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CACHE_FILE_EXT);
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let cached_path = Path::new(&cache_path_str);
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// Try to open, if it does, then we can read the image in
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match File::open(&cached_path) {
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Ok(_) => {
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let image = image::open(&cached_path).unwrap();
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Some(image.to_luma())
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}
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// Don't really care here, it just means an existing cached
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// file doesn't exist, or can't be read.
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Err(_) => None,
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}
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}
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Err(e) => {
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println!("Error: {}", e);
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None
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}
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}
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}
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/**
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* Get a matrix out of the cache
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*/
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pub fn get_matrix_from_cache(path: &Path, size: u32, extension: &str) -> Option<Vec<Vec<f64>>> {
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let hash = get_file_hash(&path);
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match hash {
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Ok(sha1) => {
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// Check if the file exists in the cache
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let cache_path_str = format!("{}/{}x{}_{}.{}", CACHE_DIR, size, size, sha1, extension);
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let cached_path = Path::new(&cache_path_str);
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// Try to open, if it does, then we can read the image in
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match File::open(&cached_path) {
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Ok(mut file) => {
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let mut compressed_matrix_data: Vec<u8> = Vec::new();
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let mut decoder = ZlibDecoder::new(&file);
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let mut matrix_data_str = String::new();
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match decoder.read_to_string(&mut matrix_data_str) {
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Ok(_) => {},
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Err(e) => { println!("Unable to decompress matrix: {}",e); return None }
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};
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// convert the matrix
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let matrix: Vec<Vec<f64>> = matrix_data_str.trim().split("\n")
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.map(|line| line.split(",")
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.map(|f| f64::from_str(f).unwrap()).collect())
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.collect();
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Some(matrix)
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}
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// Don't really care here, it just means an existing cached
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// file doesn't exist, or can't be read.
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Err(_) => None,
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}
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}
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Err(e) => {
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println!("Error: {}", e);
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None
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}
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}
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}
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#[test]
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fn test_get_file_hash() {
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let target = "test_images/sample_01_large.jpg";
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let target_path = Path::new(target);
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let hash = get_file_hash(&target_path);
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match hash {
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Ok(v) => {
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println!("Hash: {}", v);
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assert!(v == "4beb6f2d852b75a313863916a1803ebad13a3196");
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}
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Err(e) => {
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println!("Error: {:?}", e);
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assert!(false);
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}
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}
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}
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