Implement Rust version of {dc_msg_guess_msgtype_from_suffix}

Cargo.lock

@@ -480,6 +480,7 @@ dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lettre 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mmime 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-derive 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1074,6 +1075,11 @@ dependencies = [
  "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "maplit"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "matches"
 version = "0.1.8"
@@ -2802,6 +2808,7 @@ dependencies = [
 "checksum log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
 "checksum lru-cache 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "31e24f1ad8321ca0e8a1e0ac13f23cb668e6f5466c2c57319f6a5cf1cc8e3b1c"
 "checksum mach 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "86dd2487cdfea56def77b88438a2c915fb45113c5319bfe7e14306ca4cd0b0e1"
+"checksum maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "08cbb6b4fef96b6d77bfc40ec491b1690c779e77b05cd9f07f787ed376fd4c43"
 "checksum matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 "checksum md-5 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a18af3dcaf2b0219366cdb4e2af65a6101457b415c3d1a5c71dd9c2b7c77b9c8"
 "checksum memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "88579771288728879b57485cc7d6b07d648c9f0141eb955f8ab7f9d45394468e"

Cargo.toml

@@ -16,6 +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"
 smallvec = "0.6.9"
 reqwest = "0.9.15"
 num-derive = "0.2.5"

src/dc_msg.rs

@@ -1,4 +1,5 @@
 use std::ffi::CString;
+use std::path::Path;
 
 use crate::constants::*;
 use crate::contact::*;
@@ -352,6 +353,24 @@ pub unsafe fn dc_msg_guess_msgtype_from_suffix(
     free(dummy_buf as *mut libc::c_void);
 }
 
+pub fn dc_msg_guess_msgtype_from_suffix2(path: &Path) -> Option<(Viewtype, &str)> {
+    let known = hashmap! {
+        "mp3"   => (Viewtype::Audio, "audio/mpeg"),
+        "aac"   => (Viewtype::Audio, "audio/aac"),
+        "mp4"   => (Viewtype::Video, "video/mp4"),
+        "jpg"   => (Viewtype::Image, "image/jpeg"),
+        "jpeg"  => (Viewtype::Image, "image/jpeg"),
+        "png"   => (Viewtype::Image, "image/png"),
+        "webp"  => (Viewtype::Image, "image/webp"),
+        "gif"   => (Viewtype::Gif,   "image/gif"),
+        "vcf"   => (Viewtype::File,  "text/vcard"),
+        "vcard" => (Viewtype::File,  "text/vcard"),
+    };
+    let extension = path.extension()?.to_str()?;
+
+    known.get(extension).map(|x| *x)
+}
+
 pub unsafe fn dc_msg_get_file(msg: *const dc_msg_t) -> *mut libc::c_char {
     let mut file_abs = 0 as *mut libc::c_char;
 

src/lib.rs

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