| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #import "NSData+GRPC.h" |
| |
| #include <grpc/byte_buffer.h> |
| #include <grpc/byte_buffer_reader.h> |
| #include <string.h> |
| |
| // TODO(jcanizales): Move these two incantations to the C library. |
| |
| static void MallocAndCopyByteBufferToCharArray(grpc_byte_buffer *buffer, |
| size_t *length, char **array) { |
| grpc_byte_buffer_reader reader; |
| if (!grpc_byte_buffer_reader_init(&reader, buffer)) { |
| // grpc_byte_buffer_reader_init can fail if the data sent by the server |
| // could not be decompressed for any reason. This is an issue with the data |
| // coming from the server and thus we want the RPC to fail with error code |
| // INTERNAL. |
| *array = NULL; |
| *length = 0; |
| return; |
| } |
| // The slice contains uncompressed data even if compressed data was received |
| // because the reader takes care of automatically decompressing it |
| grpc_slice slice = grpc_byte_buffer_reader_readall(&reader); |
| size_t uncompressed_length = GRPC_SLICE_LENGTH(slice); |
| char *result = malloc(uncompressed_length); |
| if (result) { |
| memcpy(result, GRPC_SLICE_START_PTR(slice), uncompressed_length); |
| } |
| grpc_slice_unref(slice); |
| *array = result; |
| *length = uncompressed_length; |
| } |
| |
| static grpc_byte_buffer *CopyCharArrayToNewByteBuffer(const char *array, |
| size_t length) { |
| grpc_slice slice = grpc_slice_from_copied_buffer(array, length); |
| grpc_byte_buffer *buffer = grpc_raw_byte_buffer_create(&slice, 1); |
| grpc_slice_unref(slice); |
| return buffer; |
| } |
| |
| @implementation NSData (GRPC) |
| + (instancetype)grpc_dataWithByteBuffer:(grpc_byte_buffer *)buffer { |
| if (buffer == NULL) { |
| return nil; |
| } |
| char *array; |
| size_t length; |
| MallocAndCopyByteBufferToCharArray(buffer, &length, &array); |
| if (!array) { |
| // TODO(jcanizales): grpc_byte_buffer is reference-counted, so we can |
| // prevent this memory problem by implementing a subclass of NSData |
| // that wraps the grpc_byte_buffer. Then enumerateByteRangesUsingBlock: |
| // can be implemented using a grpc_byte_buffer_reader. |
| return nil; |
| } |
| // Not depending upon size assumption of NSUInteger |
| NSUInteger length_max = MIN(length, UINT_MAX); |
| return [self dataWithBytesNoCopy:array length:length_max freeWhenDone:YES]; |
| } |
| |
| - (grpc_byte_buffer *)grpc_byteBuffer { |
| // Some implementations of NSData, as well as grpc_byte_buffer, support O(1) |
| // appending of byte arrays by not using internally a single contiguous memory |
| // block for representation. |
| // The following implementation is thus not optimal, sometimes requiring two |
| // copies (one by self.bytes and another by grpc_slice_from_copied_buffer). |
| // If it turns out to be an issue, we can use enumerateByteRangesUsingblock: |
| // to create an array of grpc_slice objects to pass to |
| // grpc_raw_byte_buffer_create. |
| // That would make it do exactly one copy, always. |
| return CopyCharArrayToNewByteBuffer((const char *)self.bytes, |
| (size_t)self.length); |
| } |
| @end |