| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| /* generates constant table for metadata.c */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| static unsigned char legal_bits[256 / 8]; |
| |
| static void legal(int x) { |
| int byte = x / 8; |
| int bit = x % 8; |
| /* NB: the following integer arithmetic operation needs to be in its |
| * expanded form due to the "integral promotion" performed (see section |
| * 3.2.1.1 of the C89 draft standard). A cast to the smaller container type |
| * is then required to avoid the compiler warning */ |
| legal_bits[byte] = |
| (unsigned char)((legal_bits[byte] | (unsigned char)(1 << bit))); |
| } |
| |
| static void dump(void) { |
| int i; |
| |
| printf("static const uint8_t legal_header_bits[256/8] = "); |
| for (i = 0; i < 256 / 8; i++) |
| printf("%c 0x%02x", i ? ',' : '{', legal_bits[i]); |
| printf(" };\n"); |
| } |
| |
| static void clear(void) { memset(legal_bits, 0, sizeof(legal_bits)); } |
| |
| int main(void) { |
| int i; |
| |
| clear(); |
| for (i = 'a'; i <= 'z'; i++) legal(i); |
| for (i = '0'; i <= '9'; i++) legal(i); |
| legal('-'); |
| legal('_'); |
| legal('.'); |
| dump(); |
| |
| clear(); |
| for (i = 32; i <= 126; i++) { |
| legal(i); |
| } |
| dump(); |
| |
| return 0; |
| } |