Use perfrect hash map for new implementation of dc_msg_guess_msgtype_from_suffix

Cargo.toml

@@ -16,7 +16,7 @@ pgp = { version = "0.2", default-features = false }
 hex = "0.3.2"
 sha2 = "0.8.0"
 rand = "0.6.5"
-maplit = "1.0.1"
+phf = { git = "https://github.com/sfackler/rust-phf", rev = "0d00821", features = ["macros"] }
 smallvec = "0.6.9"
 reqwest = "0.9.15"
 num-derive = "0.2.5"

src/dc_msg.rs

@@ -15,6 +15,7 @@ use crate::sql;
 use crate::stock::StockMessage;
 use crate::types::*;
 use crate::x::*;
+use phf::phf_map;
 use std::ptr;
 
 /* * the structure behind dc_msg_t */
@@ -286,7 +287,7 @@ pub unsafe fn dc_msg_get_filemime(msg: *const dc_msg_t) -> *mut libc::c_char {
 }
 
 pub fn dc_msg_guess_msgtype_from_suffix(path: &Path) -> Option<(Viewtype, &str)> {
-    let known = hashmap! {
+    static KNOWN: phf::Map<&'static str, (Viewtype, &'static str)> = phf_map! {
         "mp3"   => (Viewtype::Audio, "audio/mpeg"),
         "aac"   => (Viewtype::Audio, "audio/aac"),
         "mp4"   => (Viewtype::Video, "video/mp4"),
@@ -300,7 +301,7 @@ pub fn dc_msg_guess_msgtype_from_suffix(path: &Path) -> Option<(Viewtype, &str)>
     };
     let extension = path.extension()?.to_str()?;
 
-    known.get(extension).map(|x| *x)
+    KNOWN.get(extension).map(|x| *x)
 }
 
 pub unsafe fn dc_msg_get_file(msg: *const dc_msg_t) -> *mut libc::c_char {

src/lib.rs

@@ -16,8 +16,6 @@ extern crate rusqlite;
 extern crate strum;
 #[macro_use]
 extern crate strum_macros;
-#[macro_use]
-extern crate maplit;
 
 #[macro_use]
 mod log;