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

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#import "NSDictionary+GRPC.h"

#include <grpc/grpc.h>
#include <grpc/support/alloc.h>

@implementation NSDictionary (GRPC)
+ (instancetype)grpc_dictionaryFromMetadata:(grpc_metadata *)entries count:(size_t)count {
  NSMutableDictionary *metadata = [NSMutableDictionary dictionaryWithCapacity:count];
  for (grpc_metadata *entry = entries; entry < entries + count; entry++) {
    // TODO(jcanizales): Verify in a C library test that it's converting header names to lower case automatically.
    NSString *name = [NSString stringWithUTF8String:entry->key];
    if (!name) {
      continue;
    }
    if (!metadata[name]) {
      metadata[name] = [NSMutableArray array];
    }
    // TODO(jcanizales): Should we use a non-copy constructor?
    [metadata[name] addObject:[NSData dataWithBytes:entry->value
                                             length:entry->value_length]];
  }
  return metadata;
}

- (void)grpc_getMetadataArray:(grpc_metadata **)metadata {
  *metadata = gpr_malloc([self count] * sizeof(grpc_metadata));
  int i = 0;
  for (id key in self) {
    id value = self[key];
    grpc_metadata *current = &(*metadata)[i];
    current->key = [key UTF8String];
    if ([value isKindOfClass:[NSData class]]) {
      current->value = [value bytes];
    } else if ([value isKindOfClass:[NSString class]]) {
      current->value = [value UTF8String];
    } else {
      [NSException raise:NSInvalidArgumentException format:@"Metadata values must be NSString or NSData."];
    }
    current->value = [value UTF8String];
    i += 1;
  }
}
@end