Muxi Yan | c1f837c | 2017-05-04 18:17:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
Muxi Yan | 163d8d6 | 2017-06-30 09:53:37 -0700 | [diff] [blame] | 3 | * Copyright 2017 gRPC authors. |
Muxi Yan | c1f837c | 2017-05-04 18:17:13 -0700 | [diff] [blame] | 4 | * |
Muxi Yan | 163d8d6 | 2017-06-30 09:53:37 -0700 | [diff] [blame] | 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 |
Muxi Yan | c1f837c | 2017-05-04 18:17:13 -0700 | [diff] [blame] | 8 | * |
Muxi Yan | 163d8d6 | 2017-06-30 09:53:37 -0700 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Muxi Yan | c1f837c | 2017-05-04 18:17:13 -0700 | [diff] [blame] | 10 | * |
Muxi Yan | 163d8d6 | 2017-06-30 09:53:37 -0700 | [diff] [blame] | 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. |
Muxi Yan | c1f837c | 2017-05-04 18:17:13 -0700 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <grpc/support/alloc.h> |
| 20 | #include <grpc/support/log.h> |
| 21 | |
Muxi Yan | e87a7e1 | 2017-06-29 16:53:24 -0700 | [diff] [blame] | 22 | #include "src/core/lib/compression/stream_compression.h" |
Muxi Yan | c1f837c | 2017-05-04 18:17:13 -0700 | [diff] [blame] | 23 | #include "src/core/lib/iomgr/exec_ctx.h" |
| 24 | #include "src/core/lib/slice/slice_internal.h" |
| 25 | |
| 26 | #define OUTPUT_BLOCK_SIZE (1024) |
| 27 | |
| 28 | static bool gzip_flate(grpc_stream_compression_context *ctx, |
| 29 | grpc_slice_buffer *in, grpc_slice_buffer *out, |
| 30 | size_t *output_size, size_t max_output_size, int flush, |
| 31 | bool *end_of_context) { |
| 32 | GPR_ASSERT(flush == 0 || flush == Z_SYNC_FLUSH || flush == Z_FINISH); |
| 33 | /* Full flush is not allowed when inflating. */ |
| 34 | GPR_ASSERT(!(ctx->flate == inflate && (flush == Z_FINISH))); |
| 35 | |
| 36 | grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| 37 | int r; |
| 38 | bool eoc = false; |
| 39 | size_t original_max_output_size = max_output_size; |
| 40 | while (max_output_size > 0 && (in->length > 0 || flush) && !eoc) { |
| 41 | size_t slice_size = max_output_size < OUTPUT_BLOCK_SIZE ? max_output_size |
| 42 | : OUTPUT_BLOCK_SIZE; |
| 43 | grpc_slice slice_out = GRPC_SLICE_MALLOC(slice_size); |
| 44 | ctx->zs.avail_out = (uInt)slice_size; |
| 45 | ctx->zs.next_out = GRPC_SLICE_START_PTR(slice_out); |
| 46 | while (ctx->zs.avail_out > 0 && in->length > 0 && !eoc) { |
| 47 | grpc_slice slice = grpc_slice_buffer_take_first(in); |
| 48 | ctx->zs.avail_in = (uInt)GRPC_SLICE_LENGTH(slice); |
| 49 | ctx->zs.next_in = GRPC_SLICE_START_PTR(slice); |
| 50 | r = ctx->flate(&ctx->zs, Z_NO_FLUSH); |
| 51 | if (r < 0 && r != Z_BUF_ERROR) { |
| 52 | gpr_log(GPR_ERROR, "zlib error (%d)", r); |
| 53 | grpc_slice_unref_internal(&exec_ctx, slice_out); |
| 54 | grpc_exec_ctx_finish(&exec_ctx); |
| 55 | return false; |
| 56 | } else if (r == Z_STREAM_END && ctx->flate == inflate) { |
| 57 | eoc = true; |
| 58 | } |
| 59 | if (ctx->zs.avail_in > 0) { |
| 60 | grpc_slice_buffer_undo_take_first( |
| 61 | in, |
| 62 | grpc_slice_sub(slice, GRPC_SLICE_LENGTH(slice) - ctx->zs.avail_in, |
| 63 | GRPC_SLICE_LENGTH(slice))); |
| 64 | } |
| 65 | grpc_slice_unref_internal(&exec_ctx, slice); |
| 66 | } |
| 67 | if (flush != 0 && ctx->zs.avail_out > 0 && !eoc) { |
| 68 | GPR_ASSERT(in->length == 0); |
| 69 | r = ctx->flate(&ctx->zs, flush); |
| 70 | if (flush == Z_SYNC_FLUSH) { |
| 71 | switch (r) { |
| 72 | case Z_OK: |
| 73 | /* Maybe flush is not complete; just made some partial progress. */ |
| 74 | if (ctx->zs.avail_out > 0) { |
| 75 | flush = 0; |
| 76 | } |
| 77 | break; |
| 78 | case Z_BUF_ERROR: |
| 79 | case Z_STREAM_END: |
| 80 | flush = 0; |
| 81 | break; |
| 82 | default: |
| 83 | gpr_log(GPR_ERROR, "zlib error (%d)", r); |
| 84 | grpc_slice_unref_internal(&exec_ctx, slice_out); |
| 85 | grpc_exec_ctx_finish(&exec_ctx); |
| 86 | return false; |
| 87 | } |
| 88 | } else if (flush == Z_FINISH) { |
| 89 | switch (r) { |
| 90 | case Z_OK: |
| 91 | case Z_BUF_ERROR: |
| 92 | /* Wait for the next loop to assign additional output space. */ |
| 93 | GPR_ASSERT(ctx->zs.avail_out == 0); |
| 94 | break; |
| 95 | case Z_STREAM_END: |
| 96 | flush = 0; |
| 97 | break; |
| 98 | default: |
| 99 | gpr_log(GPR_ERROR, "zlib error (%d)", r); |
| 100 | grpc_slice_unref_internal(&exec_ctx, slice_out); |
| 101 | grpc_exec_ctx_finish(&exec_ctx); |
| 102 | return false; |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | if (ctx->zs.avail_out == 0) { |
| 108 | grpc_slice_buffer_add(out, slice_out); |
| 109 | } else if (ctx->zs.avail_out < slice_size) { |
| 110 | slice_out.data.refcounted.length -= ctx->zs.avail_out; |
| 111 | grpc_slice_buffer_add(out, slice_out); |
| 112 | } else { |
| 113 | grpc_slice_unref_internal(&exec_ctx, slice_out); |
| 114 | } |
| 115 | max_output_size -= (slice_size - ctx->zs.avail_out); |
| 116 | } |
| 117 | grpc_exec_ctx_finish(&exec_ctx); |
| 118 | if (end_of_context) { |
| 119 | *end_of_context = eoc; |
| 120 | } |
| 121 | if (output_size) { |
| 122 | *output_size = original_max_output_size - max_output_size; |
| 123 | } |
| 124 | return true; |
| 125 | } |
| 126 | |
| 127 | bool grpc_stream_compress(grpc_stream_compression_context *ctx, |
| 128 | grpc_slice_buffer *in, grpc_slice_buffer *out, |
| 129 | size_t *output_size, size_t max_output_size, |
| 130 | grpc_stream_compression_flush flush) { |
| 131 | GPR_ASSERT(ctx->flate == deflate); |
| 132 | int gzip_flush; |
| 133 | switch (flush) { |
| 134 | case GRPC_STREAM_COMPRESSION_FLUSH_NONE: |
| 135 | gzip_flush = 0; |
| 136 | break; |
| 137 | case GRPC_STREAM_COMPRESSION_FLUSH_SYNC: |
| 138 | gzip_flush = Z_SYNC_FLUSH; |
| 139 | break; |
| 140 | case GRPC_STREAM_COMPRESSION_FLUSH_FINISH: |
| 141 | gzip_flush = Z_FINISH; |
| 142 | break; |
| 143 | default: |
| 144 | gzip_flush = 0; |
| 145 | } |
| 146 | return gzip_flate(ctx, in, out, output_size, max_output_size, gzip_flush, |
| 147 | NULL); |
| 148 | } |
| 149 | |
| 150 | bool grpc_stream_decompress(grpc_stream_compression_context *ctx, |
| 151 | grpc_slice_buffer *in, grpc_slice_buffer *out, |
| 152 | size_t *output_size, size_t max_output_size, |
| 153 | bool *end_of_context) { |
| 154 | GPR_ASSERT(ctx->flate == inflate); |
| 155 | return gzip_flate(ctx, in, out, output_size, max_output_size, Z_SYNC_FLUSH, |
| 156 | end_of_context); |
| 157 | } |
| 158 | |
| 159 | grpc_stream_compression_context *grpc_stream_compression_context_create( |
| 160 | grpc_stream_compression_method method) { |
| 161 | grpc_stream_compression_context *ctx = |
Yash Tibrewal | 52778c4 | 2017-09-11 15:00:11 -0700 | [diff] [blame] | 162 | (grpc_stream_compression_context *)gpr_zalloc( |
| 163 | sizeof(grpc_stream_compression_context)); |
Muxi Yan | c1f837c | 2017-05-04 18:17:13 -0700 | [diff] [blame] | 164 | int r; |
| 165 | if (ctx == NULL) { |
| 166 | return NULL; |
| 167 | } |
| 168 | if (method == GRPC_STREAM_COMPRESSION_DECOMPRESS) { |
| 169 | r = inflateInit2(&ctx->zs, 0x1F); |
| 170 | ctx->flate = inflate; |
| 171 | } else { |
| 172 | r = deflateInit2(&ctx->zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 0x1F, 8, |
| 173 | Z_DEFAULT_STRATEGY); |
| 174 | ctx->flate = deflate; |
| 175 | } |
| 176 | if (r != Z_OK) { |
| 177 | gpr_free(ctx); |
| 178 | return NULL; |
| 179 | } |
| 180 | |
| 181 | return ctx; |
| 182 | } |
| 183 | |
| 184 | void grpc_stream_compression_context_destroy( |
| 185 | grpc_stream_compression_context *ctx) { |
| 186 | if (ctx->flate == inflate) { |
| 187 | inflateEnd(&ctx->zs); |
| 188 | } else { |
| 189 | deflateEnd(&ctx->zs); |
| 190 | } |
| 191 | gpr_free(ctx); |
| 192 | } |