1 // util.cc 2 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 // Copyright 2005-2010 Google, Inc. 16 // Author: riley (at) google.com (Michael Riley) 17 // 18 // \file 19 // FST utility definitions. 20 21 #include <cctype> 22 #include <string> 23 #include <fst/util.h> 24 25 // Utility flag definitions 26 27 DEFINE_bool(fst_error_fatal, true, 28 "FST errors are fatal; o.w. return objects flagged as bad: " 29 " e.g., FSTs - kError prop. true, FST weights - not a member()"); 30 31 namespace fst { 32 33 int64 StrToInt64(const string &s, const string &src, size_t nline, 34 bool allow_negative = false, bool *error) { 35 int64 n; 36 const char *cs = s.c_str(); 37 char *p; 38 if (error) *error = false; 39 n = strtoll(cs, &p, 10); 40 if (p < cs + s.size() || (!allow_negative && n < 0)) { 41 FSTERROR() << "StrToInt64: Bad integer = " << s 42 << "\", source = " << src << ", line = " << nline; 43 if (error) *error = true; 44 return 0; 45 } 46 return n; 47 } 48 49 void Int64ToStr(int64 n, string *s) { 50 ostringstream nstr; 51 nstr << n; 52 *s = nstr.str(); 53 } 54 55 void ConvertToLegalCSymbol(string *s) { 56 for (string::iterator it = s->begin(); it != s->end(); ++it) 57 if (!isalnum(*it)) *it = '_'; 58 } 59 60 // Skips over input characters to align to 'align' bytes. Returns 61 // false if can't align. 62 bool AlignInput(istream &strm, int align) { 63 char c; 64 for (int i = 0; i < align; ++i) { 65 int64 pos = strm.tellg(); 66 if (pos < 0) { 67 LOG(ERROR) << "AlignInput: can't determine stream position"; 68 return false; 69 } 70 if (pos % align == 0) break; 71 strm.read(&c, 1); 72 } 73 return true; 74 } 75 76 // Write null output characters to align to 'align' bytes. Returns 77 // false if can't align. 78 bool AlignOutput(ostream &strm, int align) { 79 for (int i = 0; i < align; ++i) { 80 int64 pos = strm.tellp(); 81 if (pos < 0) { 82 LOG(ERROR) << "AlignOutput: can't determine stream position"; 83 return false; 84 } 85 if (pos % align == 0) break; 86 strm.write("", 1); 87 } 88 return true; 89 } 90 91 92 } // namespace fst 93
