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 <grpc/support/port_platform.h>
20
21 #include <grpc/byte_buffer_reader.h>
22 #include <string.h>
23
24 #include <grpc/byte_buffer.h>
25 #include <grpc/compression.h>
26 #include <grpc/grpc.h>
27 #include <grpc/slice_buffer.h>
28 #include <grpc/support/alloc.h>
29 #include <grpc/support/log.h>
30
31 #include "src/core/lib/compression/message_compress.h"
32 #include "src/core/lib/iomgr/exec_ctx.h"
33 #include "src/core/lib/slice/slice_internal.h"
34
is_compressed(grpc_byte_buffer * buffer)35 static int is_compressed(grpc_byte_buffer* buffer) {
36 switch (buffer->type) {
37 case GRPC_BB_RAW:
38 if (buffer->data.raw.compression == GRPC_COMPRESS_NONE) {
39 return 0 /* GPR_FALSE */;
40 }
41 break;
42 }
43 return 1 /* GPR_TRUE */;
44 }
45
grpc_byte_buffer_reader_init(grpc_byte_buffer_reader * reader,grpc_byte_buffer * buffer)46 int grpc_byte_buffer_reader_init(grpc_byte_buffer_reader* reader,
47 grpc_byte_buffer* buffer) {
48 grpc_core::ExecCtx exec_ctx;
49 grpc_slice_buffer decompressed_slices_buffer;
50 reader->buffer_in = buffer;
51 switch (reader->buffer_in->type) {
52 case GRPC_BB_RAW:
53 grpc_slice_buffer_init(&decompressed_slices_buffer);
54 if (is_compressed(reader->buffer_in)) {
55 if (grpc_msg_decompress(
56
57 grpc_compression_algorithm_to_message_compression_algorithm(
58 reader->buffer_in->data.raw.compression),
59 &reader->buffer_in->data.raw.slice_buffer,
60 &decompressed_slices_buffer) == 0) {
61 gpr_log(GPR_ERROR,
62 "Unexpected error decompressing data for algorithm with enum "
63 "value '%d'.",
64 reader->buffer_in->data.raw.compression);
65 memset(reader, 0, sizeof(*reader));
66 return 0;
67 } else { /* all fine */
68 reader->buffer_out =
69 grpc_raw_byte_buffer_create(decompressed_slices_buffer.slices,
70 decompressed_slices_buffer.count);
71 }
72 grpc_slice_buffer_destroy_internal(&decompressed_slices_buffer);
73 } else { /* not compressed, use the input buffer as output */
74 reader->buffer_out = reader->buffer_in;
75 }
76 reader->current.index = 0;
77 break;
78 }
79
80 return 1;
81 }
82
grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader * reader)83 void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader* reader) {
84 switch (reader->buffer_in->type) {
85 case GRPC_BB_RAW:
86 /* keeping the same if-else structure as in the init function */
87 if (is_compressed(reader->buffer_in)) {
88 grpc_byte_buffer_destroy(reader->buffer_out);
89 }
90 break;
91 }
92 }
93
grpc_byte_buffer_reader_next(grpc_byte_buffer_reader * reader,grpc_slice * slice)94 int grpc_byte_buffer_reader_next(grpc_byte_buffer_reader* reader,
95 grpc_slice* slice) {
96 switch (reader->buffer_in->type) {
97 case GRPC_BB_RAW: {
98 grpc_slice_buffer* slice_buffer;
99 slice_buffer = &reader->buffer_out->data.raw.slice_buffer;
100 if (reader->current.index < slice_buffer->count) {
101 *slice = grpc_slice_ref_internal(
102 slice_buffer->slices[reader->current.index]);
103 reader->current.index += 1;
104 return 1;
105 }
106 break;
107 }
108 }
109 return 0;
110 }
111
grpc_byte_buffer_reader_readall(grpc_byte_buffer_reader * reader)112 grpc_slice grpc_byte_buffer_reader_readall(grpc_byte_buffer_reader* reader) {
113 grpc_slice in_slice;
114 size_t bytes_read = 0;
115 const size_t input_size = grpc_byte_buffer_length(reader->buffer_out);
116 grpc_slice out_slice = GRPC_SLICE_MALLOC(input_size);
117 uint8_t* const outbuf = GRPC_SLICE_START_PTR(out_slice); /* just an alias */
118
119 grpc_core::ExecCtx exec_ctx;
120 while (grpc_byte_buffer_reader_next(reader, &in_slice) != 0) {
121 const size_t slice_length = GRPC_SLICE_LENGTH(in_slice);
122 memcpy(&(outbuf[bytes_read]), GRPC_SLICE_START_PTR(in_slice), slice_length);
123 bytes_read += slice_length;
124 grpc_slice_unref_internal(in_slice);
125 GPR_ASSERT(bytes_read <= input_size);
126 }
127
128 return out_slice;
129 }
130