aboutsummaryrefslogtreecommitdiffhomepage
path: root/test/core/util/slice_splitter.c
blob: 95b55a6505a0e7baba0e5c667e53c33178011cd3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/*
 *
 * 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.
 *
 */

#include "test/core/util/slice_splitter.h"

#include <string.h>

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

const char *grpc_slice_split_mode_name(grpc_slice_split_mode mode) {
  switch (mode) {
    case GRPC_SLICE_SPLIT_IDENTITY:
      return "identity";
    case GRPC_SLICE_SPLIT_MERGE_ALL:
      return "merge_all";
    case GRPC_SLICE_SPLIT_ONE_BYTE:
      return "one_byte";
  }
  return "error";
}

void grpc_split_slices(grpc_slice_split_mode mode, gpr_slice *src_slices,
                       size_t src_slice_count, gpr_slice **dst_slices,
                       size_t *dst_slice_count) {
  size_t i, j;
  size_t length;

  switch (mode) {
    case GRPC_SLICE_SPLIT_IDENTITY:
      *dst_slice_count = src_slice_count;
      *dst_slices = gpr_malloc(sizeof(gpr_slice) * src_slice_count);
      for (i = 0; i < src_slice_count; i++) {
        (*dst_slices)[i] = src_slices[i];
        gpr_slice_ref((*dst_slices)[i]);
      }
      break;
    case GRPC_SLICE_SPLIT_MERGE_ALL:
      *dst_slice_count = 1;
      length = 0;
      for (i = 0; i < src_slice_count; i++) {
        length += GPR_SLICE_LENGTH(src_slices[i]);
      }
      *dst_slices = gpr_malloc(sizeof(gpr_slice));
      **dst_slices = gpr_slice_malloc(length);
      length = 0;
      for (i = 0; i < src_slice_count; i++) {
        memcpy(GPR_SLICE_START_PTR(**dst_slices) + length,
               GPR_SLICE_START_PTR(src_slices[i]),
               GPR_SLICE_LENGTH(src_slices[i]));
        length += GPR_SLICE_LENGTH(src_slices[i]);
      }
      break;
    case GRPC_SLICE_SPLIT_ONE_BYTE:
      length = 0;
      for (i = 0; i < src_slice_count; i++) {
        length += GPR_SLICE_LENGTH(src_slices[i]);
      }
      *dst_slice_count = length;
      *dst_slices = gpr_malloc(sizeof(gpr_slice) * length);
      length = 0;
      for (i = 0; i < src_slice_count; i++) {
        for (j = 0; j < GPR_SLICE_LENGTH(src_slices[i]); j++) {
          (*dst_slices)[length] = gpr_slice_sub(src_slices[i], j, j + 1);
          length++;
        }
      }
      break;
  }
}

void grpc_split_slices_to_buffer(grpc_slice_split_mode mode,
                                 gpr_slice *src_slices, size_t src_slice_count,
                                 gpr_slice_buffer *dst) {
  gpr_slice *slices;
  size_t nslices;
  size_t i;
  grpc_split_slices(mode, src_slices, src_slice_count, &slices, &nslices);
  for (i = 0; i < nslices; i++) {
    /* add indexed to avoid re-merging split slices */
    gpr_slice_buffer_add_indexed(dst, slices[i]);
  }
  gpr_free(slices);
}

void grpc_split_slice_buffer(grpc_slice_split_mode mode, gpr_slice_buffer *src,
                             gpr_slice_buffer *dst) {
  grpc_split_slices_to_buffer(mode, src->slices, src->count, dst);
}

gpr_slice grpc_slice_merge(gpr_slice *slices, size_t nslices) {
  uint8_t *out = NULL;
  size_t length = 0;
  size_t capacity = 0;
  size_t i;

  for (i = 0; i < nslices; i++) {
    if (GPR_SLICE_LENGTH(slices[i]) + length > capacity) {
      capacity = GPR_MAX(capacity * 2, GPR_SLICE_LENGTH(slices[i]) + length);
      out = gpr_realloc(out, capacity);
    }
    memcpy(out + length, GPR_SLICE_START_PTR(slices[i]),
           GPR_SLICE_LENGTH(slices[i]));
    length += GPR_SLICE_LENGTH(slices[i]);
  }

  return gpr_slice_new(out, length, gpr_free);
}