1 /**
2 * Copyright 2010 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 // Author: Shawn Ligocki
18
19 #include "phonenumbers/utf/unilib.h"
20
21 #include "phonenumbers/base/basictypes.h"
22 #include "phonenumbers/utf/utf.h"
23
24 namespace i18n {
25 namespace phonenumbers {
26 namespace UniLib {
27
28 namespace {
29
30 // MOE: start_strip
31 // MOE: end_strip
32 // Codepoints not allowed for interchange are:
33 // C0 (ASCII) controls: U+0000 to U+001F excluding Space (SP, U+0020),
34 // Horizontal Tab (HT, U+0009), Line-Feed (LF, U+000A),
35 // Form Feed (FF, U+000C) and Carriage-Return (CR, U+000D)
36 // C1 controls: U+007F to U+009F
37 // Surrogates: U+D800 to U+DFFF
38 // Non-characters: U+FDD0 to U+FDEF and U+xxFFFE to U+xxFFFF for all xx
IsInterchangeValidCodepoint(char32 c)39 inline bool IsInterchangeValidCodepoint(char32 c) {
40 return !((c >= 0x00 && c <= 0x08) || c == 0x0B || (c >= 0x0E && c <= 0x1F) ||
41 (c >= 0x7F && c <= 0x9F) ||
42 (c >= 0xD800 && c <= 0xDFFF) ||
43 (c >= 0xFDD0 && c <= 0xFDEF) || (c&0xFFFE) == 0xFFFE);
44 }
45
46 } // namespace
47
SpanInterchangeValid(const char * begin,int byte_length)48 int SpanInterchangeValid(const char* begin, int byte_length) {
49 Rune rune;
50 const char* p = begin;
51 const char* end = begin + byte_length;
52 while (p < end) {
53 int bytes_consumed = charntorune(&rune, p, static_cast<int>(end - p));
54 // We want to accept Runeerror == U+FFFD as a valid char, but it is used
55 // by chartorune to indicate error. Luckily, the real codepoint is size 3
56 // while errors return bytes_consumed <= 1.
57 if ((rune == Runeerror && bytes_consumed <= 1) ||
58 !IsInterchangeValidCodepoint(rune)) {
59 break; // Found
60 }
61 p += bytes_consumed;
62 }
63 return static_cast<int>(p - begin);
64 }
65
66 } // namespace UniLib
67 } // namespace phonenumbers
68 } // namespace i18n
69