From 66bb295237433eb1e4a6d72eb88e574ba05a913c Mon Sep 17 00:00:00 2001
From: Jeff Muizelaar <jmuizelaar@mozilla.com>
Date: Thu, 16 Nov 2017 22:05:47 -0500
Subject: [PATCH] Add functions to get font tag information

---
 Cargo.toml  |  2 +-
 src/font.rs | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 91231b8..c2bdb8b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,6 @@ elcapitan = []
 
 [dependencies]
 bitflags = "1.0"
-core-foundation = "0.4"
+core-foundation = "0.4.5"
 foreign-types = "0.3.0"
 libc = "0.2"
diff --git a/src/font.rs b/src/font.rs
index 73265a7..96e9f33 100644
--- a/src/font.rs
+++ b/src/font.rs
@@ -7,7 +7,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use std::ptr;
 use core_foundation::base::{CFRelease, CFRetain, CFTypeID, TCFType};
+use core_foundation::array::{CFArray, CFArrayRef};
+use core_foundation::data::{CFData, CFDataRef};
 use core_foundation::string::{CFString, CFStringRef};
 use core_foundation::dictionary::{CFDictionary, CFDictionaryRef};
 use data_provider::CGDataProvider;
@@ -104,6 +107,21 @@ impl CGFont {
             CGFontGetUnitsPerEm(self.as_ptr())
         }
     }
+
+    pub fn copy_table_tags(&self) -> CFArray<u32> {
+        unsafe {
+            TCFType::wrap_under_create_rule(CGFontCopyTableTags(self.as_ptr()))
+        }
+    }
+
+    pub fn copy_table_for_tag(&self, tag: u32) -> Option<CFData> {
+        let data_ref = unsafe { CGFontCopyTableForTag(self.as_ptr(), tag) };
+        if data_ref != ptr::null() {
+            Some(unsafe { TCFType::wrap_under_create_rule(data_ref) })
+        } else {
+            None
+        }
+    }
 }
 
 #[link(name = "CoreGraphics", kind = "framework")]
@@ -132,4 +150,7 @@ extern {
                               advances: *mut c_int)
                               -> bool;
     fn CGFontGetUnitsPerEm(font: ::sys::CGFontRef) -> c_int;
+
+    fn CGFontCopyTableTags(font: ::sys::CGFontRef) -> CFArrayRef;
+    fn CGFontCopyTableForTag(font: ::sys::CGFontRef, tag: u32) -> CFDataRef;
 }