Line data    Source code

       1             : /*
       2             :  *
       3             :  * Copyright 2015, Google Inc.
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions are
       8             :  * met:
       9             :  *
      10             :  *     * Redistributions of source code must retain the above copyright
      11             :  * notice, this list of conditions and the following disclaimer.
      12             :  *     * Redistributions in binary form must reproduce the above
      13             :  * copyright notice, this list of conditions and the following disclaimer
      14             :  * in the documentation and/or other materials provided with the
      15             :  * distribution.
      16             :  *     * Neither the name of Google Inc. nor the names of its
      17             :  * contributors may be used to endorse or promote products derived from
      18             :  * this software without specific prior written permission.
      19             :  *
      20             :  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      21             :  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      22             :  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      23             :  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      24             :  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      25             :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      26             :  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      27             :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      28             :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      29             :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      30             :  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      31             :  *
      32             :  */
      33             : 
      34             : #include <grpc/byte_buffer_reader.h>
      35             : 
      36             : #include <grpc/compression.h>
      37             : #include <grpc/grpc.h>
      38             : #include <grpc/support/alloc.h>
      39             : #include <grpc/support/log.h>
      40             : #include <grpc/support/slice_buffer.h>
      41             : #include <grpc/byte_buffer.h>
      42             : 
      43             : #include "src/core/compression/message_compress.h"
      44             : 
      45     5584121 : static int is_compressed(grpc_byte_buffer *buffer) {
      46     5584121 :   switch (buffer->type) {
      47             :     case GRPC_BB_RAW:
      48     5584121 :       if (buffer->data.raw.compression == GRPC_COMPRESS_NONE) {
      49     5583997 :         return 0 /* GPR_FALSE */;
      50             :       }
      51         124 :       break;
      52             :   }
      53         124 :   return 1 /* GPR_TRUE */;
      54             : }
      55             : 
      56     2793429 : void grpc_byte_buffer_reader_init(grpc_byte_buffer_reader *reader,
      57             :                                   grpc_byte_buffer *buffer) {
      58             :   gpr_slice_buffer decompressed_slices_buffer;
      59     2793429 :   reader->buffer_in = buffer;
      60     2793429 :   switch (reader->buffer_in->type) {
      61             :     case GRPC_BB_RAW:
      62     2795331 :       gpr_slice_buffer_init(&decompressed_slices_buffer);
      63     2795121 :       if (is_compressed(reader->buffer_in)) {
      64          62 :         grpc_msg_decompress(reader->buffer_in->data.raw.compression,
      65          62 :                             &reader->buffer_in->data.raw.slice_buffer,
      66             :                             &decompressed_slices_buffer);
      67          62 :         reader->buffer_out =
      68          62 :             grpc_raw_byte_buffer_create(decompressed_slices_buffer.slices,
      69             :                                         decompressed_slices_buffer.count);
      70          62 :         gpr_slice_buffer_destroy(&decompressed_slices_buffer);
      71             :       } else { /* not compressed, use the input buffer as output */
      72     2795054 :         reader->buffer_out = reader->buffer_in;
      73             :       }
      74     2795109 :       reader->current.index = 0;
      75     2795109 :       break;
      76             :   }
      77     2793207 : }
      78             : 
      79     2795839 : void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader *reader) {
      80     2795839 :   switch (reader->buffer_in->type) {
      81             :     case GRPC_BB_RAW:
      82             :       /* keeping the same if-else structure as in the init function */
      83     2795701 :       if (is_compressed(reader->buffer_in)) {
      84          62 :         grpc_byte_buffer_destroy(reader->buffer_out);
      85             :       }
      86     2795975 :       break;
      87             :   }
      88     2796113 : }
      89             : 
      90     5609721 : int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader *reader,
      91             :                                  gpr_slice *slice) {
      92     5609721 :   switch (reader->buffer_in->type) {
      93             :     case GRPC_BB_RAW: {
      94             :       gpr_slice_buffer *slice_buffer;
      95     5611451 :       slice_buffer = &reader->buffer_out->data.raw.slice_buffer;
      96     5611451 :       if (reader->current.index < slice_buffer->count) {
      97     2815988 :         *slice = gpr_slice_ref(slice_buffer->slices[reader->current.index]);
      98     2817789 :         reader->current.index += 1;
      99     2817789 :         return 1;
     100             :       }
     101     2795463 :       break;
     102             :     }
     103             :   }
     104     2793733 :   return 0;
     105             : }