Remove 64 bit conversion with precision loss warnings

Author: Damien Rambout

Sources/OAuth2Client/NXOAuth2PostBodyStream.m

@@ -30,8 +30,7 @@ - (id)initWithParameters:(NSDictionary *)postParameters;
 {
     self = [self init];
     if (self) {
-        srandom(time(NULL));
-        boundary = [[NSString alloc] initWithFormat:@"------------nx-oauth2%d", rand()];
+        boundary = [[NSString alloc] initWithFormat:@"------------nx-oauth2%@", @(arc4random())];
         numBytesTotal = 0;
         streamIndex = 0;
 
@@ -88,7 +87,7 @@ - (NSArray *)streamsForParameters:(NSDictionary *)parameters contentLength:(unsi
             NSData *delimiterData = [delimiter dataUsingEncoding:NSUTF8StringEncoding];
             NSData *contentHeaderData = [[part contentHeaders] dataUsingEncoding:NSUTF8StringEncoding];
 
-            int dataLength = delimiterData.length + contentHeaderData.length;
+            NSUInteger dataLength = delimiterData.length + contentHeaderData.length;
             NSMutableData *headerData = [NSMutableData dataWithCapacity: dataLength];
             [headerData appendData:delimiterData];
             [headerData appendData:contentHeaderData];
@@ -146,7 +145,7 @@ - (NSInteger)read:(uint8_t *)buffer maxLength:(NSUInteger)len;
     if (currentStream == nil)
         return 0;
 
-    int result = [currentStream read:buffer maxLength:len];
+    NSInteger result = [currentStream read:buffer maxLength:len];
 
     if (result == 0) {
         if (streamIndex < contentStreams.count - 1) {