From 18d715ef1c0cac9ee3d39309426b6cf03f7c0e8c Mon Sep 17 00:00:00 2001
From: Drew Short <warrick@sothr.com>
Date: Tue, 15 Sep 2015 14:50:34 -0500
Subject: [PATCH] Working on a simple caching solution for already processed
 image buffers

---
 Cargo.toml   |  1 +
 src/cache.rs | 30 ++++++++++++++++++++++++++++++
 src/hash.rs  |  4 ++++
 src/lib.rs   |  1 +
 4 files changed, 36 insertions(+)
 create mode 100644 src/cache.rs

diff --git a/Cargo.toml b/Cargo.toml
index 16eae08..a31c524 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,3 +9,4 @@ rustc-serialize = "*"
 image = "*"
 complex = "*"
 dft = "*"
+rust-crypto = "*"
diff --git a/src/cache.rs b/src/cache.rs
new file mode 100644
index 0000000..1ee76a5
--- /dev/null
+++ b/src/cache.rs
@@ -0,0 +1,30 @@
+// Copyright 2015 Drew Short <drew@sothr.com>.
+//
+// Licensed under the MIT license<LICENSE-MIT or http://opensource.org/licenses/MIT>.
+// This file may not be copied, modified, or distributed except according to those terms.
+
+extern image;
+
+use self::image::ImageBuffer;
+use std::path::Path;
+
+/**
+ * Get the hash of the desired file and return it as a hex string
+ */
+fn get_file_hash(path: &Path) -> String {
+    
+}
+
+/**
+ * Put an image buffer in the cache
+ */
+pub fn put_in_cache(path: &Path, image: &ImageBuffer)  {
+
+}
+
+/**
+ * Get an image buffer out of the cache
+ */
+pub fn get_from_cache(path: &Path) -> Some(ImageBuffer) {
+
+}
diff --git a/src/hash.rs b/src/hash.rs
index f4c3873..a3fb7d6 100644
--- a/src/hash.rs
+++ b/src/hash.rs
@@ -51,6 +51,10 @@ pub struct PerceptualHashes<'a> {
  */
 pub fn prepare_image(path: &Path, size: u32) -> PreparedImage {
     let image_path = path.to_str().unwrap();
+    // Check if we have the already converted image in a cache and use that if possible.
+    
+
+    // Otherwise let's do that work now and store it.
     let image = image::open(path).unwrap();
     let small_image = image.resize_exact(size, size, FilterType::Lanczos3);
     let grey_image = small_image.to_luma();
diff --git a/src/lib.rs b/src/lib.rs
index 6b2e675..b54aec8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,6 +6,7 @@
 use std::path::Path;
 
 mod hash;
+mod cache;
 
 pub fn get_phashes(path: &Path) -> hash::PerceptualHashes {
     hash::get_perceptual_hashes(path, 8)