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/*
* Open Chinese Convert
*
* Copyright 2010-2014 Carbo Kuo <byvoid@byvoid.com>
*
* 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.
*/
#include "UTF8Util.hpp"
using namespace opencc;
void UTF8Util::SkipUtf8Bom(FILE* fp) {
/* UTF-8 BOM is EF BB BF */
if (fp == NULL) {
return;
}
/* If we are not at beginning of file, return */
if (ftell(fp) != 0) {
return;
}
/* Try to read first 3 bytes */
int bom[3];
int n;
for (n = 0; n <= 2 && (bom[n] = getc(fp)) != EOF; n++) {
}
/* If we can only read <3 bytes, push them back */
/* Or if first 3 bytes is not BOM, push them back */
if ((n < 3) || (bom[0] != 0xEF) || (bom[1] != 0xBB) || (bom[2] != 0xBF)) {
for (n--; n >= 0; n--) {
ungetc(bom[n], fp);
}
}
/* Otherwise, BOM is already skipped */
}