1 files changed, 85 insertions, 0 deletions
diff --git a/lib/DDHidUsageTables.m b/lib/DDHidUsageTables.m
new file mode 100644
index 0000000..9e7703a
--- /dev/null
+++ b/lib/DDHidUsageTables.m
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2007 Dave Dribin
+ * 
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#import "DDHidUsageTables.h"
+
+@implementation DDHidUsageTables
+
+static DDHidUsageTables * sStandardUsageTables = nil;
+
++ (DDHidUsageTables *) standardUsageTables;
+{
+    if (sStandardUsageTables == nil)
+    {
+        NSBundle * myBundle = [NSBundle bundleForClass: self];
+        NSString * usageTablesPath =
+            [myBundle pathForResource: @"DDHidStandardUsages" ofType: @"plist"];
+        NSDictionary * lookupTables =
+            [NSDictionary dictionaryWithContentsOfFile: usageTablesPath];
+        sStandardUsageTables =
+            [[DDHidUsageTables alloc] initWithLookupTables: lookupTables];
+        [sStandardUsageTables retain];
+    }
+    
+    return sStandardUsageTables;
+}
+
+- (id) initWithLookupTables: (NSDictionary *) lookupTables;
+{
+    self = [super init];
+    if (self == nil)
+        return nil;
+    
+    mLookupTables = [lookupTables retain];
+    
+    return self;
+}
+
+- (NSString *) descriptionForUsagePage: (unsigned) usagePage
+                                usage: (unsigned) usage
+{
+    NSString * usagePageString = [NSString stringWithFormat: @"%u", usagePage];
+    NSString * usageString = [NSString stringWithFormat: @"%u", usage];
+    // NSNumber * usagePageNumber = [NSNumber numberWithUnsignedInt: usagePage];
+    
+    NSDictionary * usagePageLookup = [mLookupTables objectForKey: usagePageString];
+    if (usagePageLookup == nil)
+        return @"Unknown usage page";
+    
+    NSDictionary * usageLookup = [usagePageLookup objectForKey: @"usages"];
+    NSString * description = [usageLookup objectForKey: usageString];
+    if (description != nil)
+        return description;
+    
+    NSString * defaultUsage = [usagePageLookup objectForKey: @"default"];
+    if (defaultUsage != nil)
+    {
+        description = [NSString stringWithFormat: defaultUsage, usage];
+        return description;
+    }
+    
+    return @"Unknown usage";
+}
+
+@end