Initial commit.

1 files changed, 120 insertions, 0 deletions

diff --git a/Liaison/LiDataTranslator.m b/Liaison/LiDataTranslator.m
new file mode 100644
index 0000000..4481c21
--- /dev/null
+++ b/Liaison/LiDataTranslator.m
@@ -0,0 +1,120 @@
+//
+//  LiDataTranslator.m
+//  Liaison
+//
+//  Created by Brian Cully on Thu Sep 25 2003.
+//  Copyright (c) 2003 Brian Cully. All rights reserved.
+//
+
+#import "LiDataTranslator.h"
+
+@implementation LiDataTranslator
+static LiDataTranslator *sharedTranslator = nil;
++ (LiDataTranslator *)sharedTranslator
+{
+    if (sharedTranslator == nil)
+        sharedTranslator = [[self alloc] init];
+    return sharedTranslator;
+}
+
+- (NSData *)decodeData: (NSData *)someData
+{
+    NSData *myData;
+    NSRange headerRange;
+    unsigned long encoding, length;
+    unsigned dataLen;
+
+    myData = nil;
+    headerRange.location = 0;
+    headerRange.length = sizeof(encoding) + sizeof(length);
+    dataLen = [someData length];
+    if (dataLen > headerRange.length) {
+
+        dataLen -= headerRange.length;
+        [someData getBytes: &encoding range: NSMakeRange(0, sizeof(encoding))];
+        [someData getBytes: &length range: NSMakeRange(sizeof(encoding), sizeof(length))];
+        encoding = ntohl(encoding);
+        length = ntohl(length);
+
+        if (dataLen >= length) {
+            myData = [someData subdataWithRange: NSMakeRange(headerRange.length, length)];
+        }
+    }
+    
+    return myData;
+}
+
+- (NSData *)encodeData: (NSData *)someData
+{
+    NSMutableData *myData;
+
+    myData = nil;
+    if (someData != nil) {
+        unsigned long encoding, length;
+
+        myData = [NSMutableData data];
+        encoding = htonl(LiPlainEncoding);
+        length = htonl([someData length]);
+
+        [myData appendBytes: &encoding length: sizeof(encoding)];
+        [myData appendBytes: &length length: sizeof(length)];
+        [myData appendData: someData];
+    }
+    return myData;
+}
+@end
+
+@implementation NSData (LiDataTranslator)
+- (NSData *)decodedData
+{
+    return [[LiDataTranslator sharedTranslator] decodeData: self];
+}
+
+- (NSData *)encodedData
+{
+    return [[LiDataTranslator sharedTranslator] encodeData: self];
+}
+@end
+
+@implementation NSDictionary (LiDataTranslator)
++ (NSDictionary *)dictionaryWithEncodedData: (NSData *)someData
+{
+    NSData *myData;
+    NSDictionary *msg;
+
+    msg = nil;
+    myData = [someData decodedData];
+    if (myData != nil) {
+        NSString *errorString;
+
+        errorString = nil;
+        msg = [NSPropertyListSerialization propertyListFromData: myData
+                                               mutabilityOption: NSPropertyListImmutable
+                                                         format: NULL
+                                               errorDescription: &errorString];
+        if (errorString != nil || [msg isKindOfClass: [NSDictionary class]] == NO) {
+            [msg release];
+            [errorString release];
+            return nil;
+        }
+    }
+    return msg;
+}
+
+- (NSData *)encodedData
+{
+    NSData *myData;
+    NSString *errorString;
+
+    errorString = nil;
+    myData = [NSPropertyListSerialization dataFromPropertyList: self
+                                                        format: NSPropertyListBinaryFormat_v1_0
+                                              errorDescription: &errorString];
+    if (errorString != nil) {
+        [LiLog logAsError: @"Couldn't serialize dictionary: %@.", errorString];
+        [errorString release];
+        return nil;
+    }
+    return [myData encodedData];
+}
+@end
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