1 //
2 //
3 // Copyright 2015 gRPC authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
17 //
18
19 #include "test/core/util/slice_splitter.h"
20
21 #include <stdint.h>
22 #include <string.h>
23
24 #include <algorithm>
25
26 #include <grpc/slice_buffer.h>
27 #include <grpc/support/alloc.h>
28
grpc_slice_split_mode_name(grpc_slice_split_mode mode)29 const char* grpc_slice_split_mode_name(grpc_slice_split_mode mode) {
30 switch (mode) {
31 case GRPC_SLICE_SPLIT_IDENTITY:
32 return "identity";
33 case GRPC_SLICE_SPLIT_MERGE_ALL:
34 return "merge_all";
35 case GRPC_SLICE_SPLIT_ONE_BYTE:
36 return "one_byte";
37 }
38 return "error";
39 }
40
grpc_split_slices(grpc_slice_split_mode mode,grpc_slice * src_slices,size_t src_slice_count,grpc_slice ** dst_slices,size_t * dst_slice_count)41 void grpc_split_slices(grpc_slice_split_mode mode, grpc_slice* src_slices,
42 size_t src_slice_count, grpc_slice** dst_slices,
43 size_t* dst_slice_count) {
44 size_t i, j;
45 size_t length;
46
47 switch (mode) {
48 case GRPC_SLICE_SPLIT_IDENTITY:
49 *dst_slice_count = src_slice_count;
50 *dst_slices = static_cast<grpc_slice*>(
51 gpr_malloc(sizeof(grpc_slice) * src_slice_count));
52 for (i = 0; i < src_slice_count; i++) {
53 (*dst_slices)[i] = src_slices[i];
54 grpc_slice_ref((*dst_slices)[i]);
55 }
56 break;
57 case GRPC_SLICE_SPLIT_MERGE_ALL:
58 *dst_slice_count = 1;
59 length = 0;
60 for (i = 0; i < src_slice_count; i++) {
61 length += GRPC_SLICE_LENGTH(src_slices[i]);
62 }
63 *dst_slices = static_cast<grpc_slice*>(gpr_malloc(sizeof(grpc_slice)));
64 **dst_slices = grpc_slice_malloc(length);
65 length = 0;
66 for (i = 0; i < src_slice_count; i++) {
67 memcpy(GRPC_SLICE_START_PTR(**dst_slices) + length,
68 GRPC_SLICE_START_PTR(src_slices[i]),
69 GRPC_SLICE_LENGTH(src_slices[i]));
70 length += GRPC_SLICE_LENGTH(src_slices[i]);
71 }
72 break;
73 case GRPC_SLICE_SPLIT_ONE_BYTE:
74 length = 0;
75 for (i = 0; i < src_slice_count; i++) {
76 length += GRPC_SLICE_LENGTH(src_slices[i]);
77 }
78 *dst_slice_count = length;
79 *dst_slices =
80 static_cast<grpc_slice*>(gpr_malloc(sizeof(grpc_slice) * length));
81 length = 0;
82 for (i = 0; i < src_slice_count; i++) {
83 for (j = 0; j < GRPC_SLICE_LENGTH(src_slices[i]); j++) {
84 (*dst_slices)[length] = grpc_slice_sub(src_slices[i], j, j + 1);
85 length++;
86 }
87 }
88 break;
89 }
90 }
91
grpc_split_slices_to_buffer(grpc_slice_split_mode mode,grpc_slice * src_slices,size_t src_slice_count,grpc_slice_buffer * dst)92 void grpc_split_slices_to_buffer(grpc_slice_split_mode mode,
93 grpc_slice* src_slices, size_t src_slice_count,
94 grpc_slice_buffer* dst) {
95 grpc_slice* slices;
96 size_t nslices;
97 size_t i;
98 grpc_split_slices(mode, src_slices, src_slice_count, &slices, &nslices);
99 for (i = 0; i < nslices; i++) {
100 // add indexed to avoid re-merging split slices
101 grpc_slice_buffer_add_indexed(dst, slices[i]);
102 }
103 gpr_free(slices);
104 }
105
grpc_split_slice_buffer(grpc_slice_split_mode mode,grpc_slice_buffer * src,grpc_slice_buffer * dst)106 void grpc_split_slice_buffer(grpc_slice_split_mode mode, grpc_slice_buffer* src,
107 grpc_slice_buffer* dst) {
108 grpc_split_slices_to_buffer(mode, src->slices, src->count, dst);
109 }
110
grpc_slice_merge(grpc_slice * slices,size_t nslices)111 grpc_slice grpc_slice_merge(grpc_slice* slices, size_t nslices) {
112 uint8_t* out = nullptr;
113 size_t length = 0;
114 size_t capacity = 0;
115 size_t i;
116
117 for (i = 0; i < nslices; i++) {
118 if (GRPC_SLICE_LENGTH(slices[i]) + length > capacity) {
119 capacity = std::max(capacity * 2, GRPC_SLICE_LENGTH(slices[i]) + length);
120 out = static_cast<uint8_t*>(gpr_realloc(out, capacity));
121 }
122 memcpy(out + length, GRPC_SLICE_START_PTR(slices[i]),
123 GRPC_SLICE_LENGTH(slices[i]));
124 length += GRPC_SLICE_LENGTH(slices[i]);
125 }
126
127 return grpc_slice_new(out, length, gpr_free);
128 }
129