Initial checkin of gRPC to third_party/

third_party/grpc/src/objective-c/GRPCClient/private/NSDictionary+GRPC.m

+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import "NSDictionary+GRPC.h"
+
+#include <grpc/support/alloc.h>
+
+#pragma mark Category for binary metadata elements
+
+@interface NSData (GRPCMetadata)
++ (instancetype)grpc_dataFromMetadataValue:(grpc_metadata *)metadata;
+
+// Fill a metadata object with the binary value in this NSData.
+- (void)grpc_initMetadata:(grpc_metadata *)metadata;
+@end
+
+@implementation NSData (GRPCMetadata)
++ (instancetype)grpc_dataFromMetadataValue:(grpc_metadata *)metadata {
+  // TODO(jcanizales): Should we use a non-copy constructor?
+  return [self dataWithBytes:metadata->value length:metadata->value_length];
+}
+
+- (void)grpc_initMetadata:(grpc_metadata *)metadata {
+  metadata->value = self.bytes;
+  metadata->value_length = self.length;
+}
+@end
+
+#pragma mark Category for textual metadata elements
+
+@interface NSString (GRPCMetadata)
++ (instancetype)grpc_stringFromMetadataValue:(grpc_metadata *)metadata;
+
+// Fill a metadata object with the textual value in this NSString.
+- (void)grpc_initMetadata:(grpc_metadata *)metadata;
+@end
+
+@implementation NSString (GRPCMetadata)
++ (instancetype)grpc_stringFromMetadataValue:(grpc_metadata *)metadata {
+  return [[self alloc] initWithBytes:metadata->value
+                              length:metadata->value_length
+                            encoding:NSASCIIStringEncoding];
+}
+
+// Precondition: This object contains only ASCII characters.
+- (void)grpc_initMetadata:(grpc_metadata *)metadata {
+  metadata->value = self.UTF8String;
+  metadata->value_length = self.length;
+}
+@end
+
+#pragma mark Category for metadata arrays
+
+@implementation NSDictionary (GRPC)
++ (instancetype)grpc_dictionaryFromMetadataArray:(grpc_metadata_array)array {
+  return [self grpc_dictionaryFromMetadata:array.metadata count:array.count];
+}
+
++ (instancetype)grpc_dictionaryFromMetadata:(grpc_metadata *)entries count:(size_t)count {
+  NSMutableDictionary *metadata = [NSMutableDictionary dictionaryWithCapacity:count];
+  for (grpc_metadata *entry = entries; entry < entries + count; entry++) {
+    NSString *name = [NSString stringWithCString:entry->key encoding:NSASCIIStringEncoding];
+    if (!name || metadata[name]) {
+      // Log if name is nil?
+      continue;
+    }
+    id value;
+    if ([name hasSuffix:@"-bin"]) {
+      value = [NSData grpc_dataFromMetadataValue:entry];
+    } else {
+      value = [NSString grpc_stringFromMetadataValue:entry];
+    }
+    metadata[name] = value;
+  }
+  return metadata;
+}
+
+// Preconditions: All keys are ASCII strings. Keys ending in -bin have NSData values; the others
+// have NSString values.
+- (grpc_metadata *)grpc_metadataArray {
+  grpc_metadata *metadata = gpr_malloc([self count] * sizeof(grpc_metadata));
+  grpc_metadata *current = metadata;
+  for (NSString* key in self) {
+    id value = self[key];
+    current->key = key.UTF8String;
+    if ([value respondsToSelector:@selector(grpc_initMetadata:)]) {
+      [value grpc_initMetadata:current];
+    } else {
+      [NSException raise:NSInvalidArgumentException
+                  format:@"Metadata values must be NSString or NSData."];
+    }
+    ++current;
+  }
+  return metadata;
+}
+@end