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// symbol-table.cc
//
// 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.
//
//
// \file
// Classes to provide symbol-to-integer and integer-to-symbol mappings.
#include "fst/lib/symbol-table.h"
#include "fst/lib/util.h"
#include <string.h>
DEFINE_bool(fst_compat_symbols, true,
"Require symbol tables to match when appropriate");
namespace fst {
// Maximum line length in textual symbols file.
const int kLineLen = 8096;
// Identifies stream data as a symbol table (and its endianity)
static const int32 kSymbolTableMagicNumber = 2125658996;
SymbolTableImpl* SymbolTableImpl::ReadText(const string &filename) {
ifstream strm(filename.c_str());
if (!strm) {
LOG(ERROR) << "SymbolTable::ReadText: Can't open symbol file: "
<< filename;
return 0;
}
SymbolTableImpl* impl = new SymbolTableImpl(filename);
int64 nline = 0;
char line[kLineLen];
while (strm.getline(line, kLineLen)) {
++nline;
vector<char *> col;
SplitToVector(line, "\n\t ", &col, true);
if (col.size() == 0) // empty line
continue;
if (col.size() != 2) {
LOG(ERROR) << "SymbolTable::ReadText: Bad number of columns (skipping), "
<< "file = " << filename << ", line = " << nline;
continue;
}
const char *symbol = col[0];
const char *value = col[1];
char *p;
int64 key = strtoll(value, &p, 10);
if (p < value + strlen(value) || key < 0) {
LOG(ERROR) << "SymbolTable::ReadText: Bad non-negative integer \""
<< value << "\" (skipping), "
<< "file = " << filename << ", line = " << nline;
continue;
}
impl->AddSymbol(symbol, key);
}
return impl;
}
void SymbolTableImpl::RecomputeCheckSum() const {
check_sum_.Reset();
for (size_t i = 0; i < symbols_.size(); ++i) {
check_sum_.Update(symbols_[i], strlen(symbols_[i])+1);
}
check_sum_finalized_ = true;
}
int64 SymbolTableImpl::AddSymbol(const string& symbol, int64 key) {
hash_map<string, int64>::const_iterator it =
symbol_map_.find(symbol);
if (it == symbol_map_.end()) { // only add if not in table
check_sum_finalized_ = false;
char *csymbol = new char[symbol.size() + 1];
strcpy(csymbol, symbol.c_str());
symbols_.push_back(csymbol);
key_map_[key] = csymbol;
symbol_map_[csymbol] = key;
if (key >= available_key_) {
available_key_ = key + 1;
}
}
return key;
}
SymbolTableImpl* SymbolTableImpl::Read(istream &strm,
const string &source) {
int32 magic_number = 0;
ReadType(strm, &magic_number);
if (magic_number != kSymbolTableMagicNumber) {
LOG(ERROR) << "SymbolTable::Read: read failed";
return 0;
}
string name;
ReadType(strm, &name);
SymbolTableImpl* impl = new SymbolTableImpl(name);
ReadType(strm, &impl->available_key_);
int64 size;
ReadType(strm, &size);
string symbol;
int64 key = 0;
for (size_t i = 0; i < size; ++i) {
ReadType(strm, &symbol);
ReadType(strm, &key);
impl->AddSymbol(symbol, key);
}
if (!strm)
LOG(ERROR) << "SymbolTable::Read: read failed";
return impl;
}
bool SymbolTableImpl::Write(ostream &strm) const {
WriteType(strm, kSymbolTableMagicNumber);
WriteType(strm, name_);
WriteType(strm, available_key_);
int64 size = symbols_.size();
WriteType(strm, size);
for (size_t i = 0; i < symbols_.size(); ++i) {
const string symbol = symbols_[i];
WriteType(strm, symbol);
hash_map<string, int64>::const_iterator it = symbol_map_.find(symbol);
WriteType(strm, it->second);
}
strm.flush();
if (!strm)
LOG(ERROR) << "SymbolTable::Write: write failed";
return strm;
}
bool SymbolTableImpl::WriteText(ostream &strm) const {
for (size_t i = 0; i < symbols_.size(); ++i) {
char line[kLineLen];
snprintf(line, kLineLen, "%s\t%lld\n", symbols_[i], Find(symbols_[i]));
strm.write(line, strlen(line));
}
strm.flush();
if (!strm)
LOG(ERROR) << "SymbolTable::WriteText: write failed";
return strm;
}
} // namespace fst
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