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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/sync/util/character_set_converters.h"
namespace browser_sync {
void TrimPathStringToValidCharacter(std::string* string) {
// Constants from http://en.wikipedia.org/wiki/UTF-8
CHECK(string);
if (string->empty())
return;
if (0 == (string->at(string->length() - 1) & 0x080))
return;
size_t partial_enc_bytes = 0;
for (partial_enc_bytes = 0 ; true ; ++partial_enc_bytes) {
if (4 == partial_enc_bytes || partial_enc_bytes == string->length()) {
// original string was broken, garbage in, garbage out.
return;
}
PathChar c = string->at(string->length() - 1 - partial_enc_bytes);
if ((c & 0x0c0) == 0x080) // utf continuation char;
continue;
if ((c & 0x0e0) == 0x0e0) { // 2-byte encoded char.
if (1 == partial_enc_bytes)
return;
else
break;
}
if ((c & 0x0f0) == 0xc0) { // 3-byte encoded char.
if (2 == partial_enc_bytes)
return;
else
break;
}
if ((c & 0x0f8) == 0x0f0) { // 4-byte encoded char.
if (3 == partial_enc_bytes)
return;
else
break;
}
}
string->resize(string->length() - 1 - partial_enc_bytes);
}
} // namespace browser_sync
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