/* * * Copyright 2015-2016, 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. * */ /* generates constant table for metadata.c */ #include #include 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; }