| /* |
| * |
| * 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 "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 CopyByteBufferToCharArray(grpc_byte_buffer *buffer, char *array) { |
| size_t offset = 0; |
| grpc_byte_buffer_reader reader; |
| grpc_byte_buffer_reader_init(&reader, buffer); |
| gpr_slice next; |
| while (grpc_byte_buffer_reader_next(&reader, &next) != 0){ |
| memcpy(array + offset, GPR_SLICE_START_PTR(next), |
| (size_t)GPR_SLICE_LENGTH(next)); |
| offset += GPR_SLICE_LENGTH(next); |
| gpr_slice_unref(next); |
| } |
| } |
| |
| static grpc_byte_buffer *CopyCharArrayToNewByteBuffer(const char *array, |
| size_t length) { |
| gpr_slice slice = gpr_slice_from_copied_buffer(array, length); |
| grpc_byte_buffer *buffer = grpc_byte_buffer_create(&slice, 1); |
| gpr_slice_unref(slice); |
| return buffer; |
| } |
| |
| @implementation NSData (GRPC) |
| + (instancetype)grpc_dataWithByteBuffer:(grpc_byte_buffer *)buffer { |
| if (buffer == NULL) { |
| return nil; |
| } |
| NSUInteger length = grpc_byte_buffer_length(buffer); |
| char *array = malloc(length * sizeof(*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; |
| } |
| CopyByteBufferToCharArray(buffer, array); |
| return [self dataWithBytesNoCopy:array length:length 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 gpr_slice_from_copied_buffer). |
| // If it turns out to be an issue, we can use enumerateByteRangesUsingblock: |
| // to create an array of gpr_slice objects to pass to grpc_byte_buffer_create. |
| // That would make it do exactly one copy, always. |
| return CopyCharArrayToNewByteBuffer((const char *)self.bytes, (size_t)self.length); |
| } |
| @end |