1// Copyright (c) 2006, Google Inc.
2// All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met:
7//
8//     * Redistributions of source code must retain the above copyright
9// notice, this list of conditions and the following disclaimer.
10//     * Redistributions in binary form must reproduce the above
11// copyright notice, this list of conditions and the following disclaimer
12// in the documentation and/or other materials provided with the
13// distribution.
14//     * Neither the name of Google Inc. nor the names of its
15// contributors may be used to endorse or promote products derived from
16// this software without specific prior written permission.
17//
18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30#include <string.h>
31
32#include "common/convert_UTF.h"
33#include "common/scoped_ptr.h"
34#include "common/string_conversion.h"
35#include "common/using_std_string.h"
36
37namespace google_breakpad {
38
39using std::vector;
40
41void UTF8ToUTF16(const char *in, vector<uint16_t> *out) {
42  size_t source_length = strlen(in);
43  const UTF8 *source_ptr = reinterpret_cast<const UTF8 *>(in);
44  const UTF8 *source_end_ptr = source_ptr + source_length;
45  // Erase the contents and zero fill to the expected size
46  out->clear();
47  out->insert(out->begin(), source_length, 0);
48  uint16_t *target_ptr = &(*out)[0];
49  uint16_t *target_end_ptr = target_ptr + out->capacity() * sizeof(uint16_t);
50  ConversionResult result = ConvertUTF8toUTF16(&source_ptr, source_end_ptr,
51                                               &target_ptr, target_end_ptr,
52                                               strictConversion);
53
54  // Resize to be the size of the # of converted characters + NULL
55  out->resize(result == conversionOK ? target_ptr - &(*out)[0] + 1: 0);
56}
57
58int UTF8ToUTF16Char(const char *in, int in_length, uint16_t out[2]) {
59  const UTF8 *source_ptr = reinterpret_cast<const UTF8 *>(in);
60  const UTF8 *source_end_ptr = source_ptr + sizeof(char);
61  uint16_t *target_ptr = out;
62  uint16_t *target_end_ptr = target_ptr + 2 * sizeof(uint16_t);
63  out[0] = out[1] = 0;
64
65  // Process one character at a time
66  while (1) {
67    ConversionResult result = ConvertUTF8toUTF16(&source_ptr, source_end_ptr,
68                                                 &target_ptr, target_end_ptr,
69                                                 strictConversion);
70
71    if (result == conversionOK)
72      return static_cast<int>(source_ptr - reinterpret_cast<const UTF8 *>(in));
73
74    // Add another character to the input stream and try again
75    source_ptr = reinterpret_cast<const UTF8 *>(in);
76    ++source_end_ptr;
77
78    if (source_end_ptr > reinterpret_cast<const UTF8 *>(in) + in_length)
79      break;
80  }
81
82  return 0;
83}
84
85void UTF32ToUTF16(const wchar_t *in, vector<uint16_t> *out) {
86  size_t source_length = wcslen(in);
87  const UTF32 *source_ptr = reinterpret_cast<const UTF32 *>(in);
88  const UTF32 *source_end_ptr = source_ptr + source_length;
89  // Erase the contents and zero fill to the expected size
90  out->clear();
91  out->insert(out->begin(), source_length, 0);
92  uint16_t *target_ptr = &(*out)[0];
93  uint16_t *target_end_ptr = target_ptr + out->capacity() * sizeof(uint16_t);
94  ConversionResult result = ConvertUTF32toUTF16(&source_ptr, source_end_ptr,
95                                                &target_ptr, target_end_ptr,
96                                                strictConversion);
97
98  // Resize to be the size of the # of converted characters + NULL
99  out->resize(result == conversionOK ? target_ptr - &(*out)[0] + 1: 0);
100}
101
102void UTF32ToUTF16Char(wchar_t in, uint16_t out[2]) {
103  const UTF32 *source_ptr = reinterpret_cast<const UTF32 *>(&in);
104  const UTF32 *source_end_ptr = source_ptr + 1;
105  uint16_t *target_ptr = out;
106  uint16_t *target_end_ptr = target_ptr + 2 * sizeof(uint16_t);
107  out[0] = out[1] = 0;
108  ConversionResult result = ConvertUTF32toUTF16(&source_ptr, source_end_ptr,
109                                                &target_ptr, target_end_ptr,
110                                                strictConversion);
111
112  if (result != conversionOK) {
113    out[0] = out[1] = 0;
114  }
115}
116
117static inline uint16_t Swap(uint16_t value) {
118  return (value >> 8) | static_cast<uint16_t>(value << 8);
119}
120
121string UTF16ToUTF8(const vector<uint16_t> &in, bool swap) {
122  const UTF16 *source_ptr = &in[0];
123  scoped_array<uint16_t> source_buffer;
124
125  // If we're to swap, we need to make a local copy and swap each byte pair
126  if (swap) {
127    int idx = 0;
128    source_buffer.reset(new uint16_t[in.size()]);
129    UTF16 *source_buffer_ptr = source_buffer.get();
130    for (vector<uint16_t>::const_iterator it = in.begin();
131         it != in.end(); ++it, ++idx)
132      source_buffer_ptr[idx] = Swap(*it);
133
134    source_ptr = source_buffer.get();
135  }
136
137  // The maximum expansion would be 4x the size of the input string.
138  const UTF16 *source_end_ptr = source_ptr + in.size();
139  size_t target_capacity = in.size() * 4;
140  scoped_array<UTF8> target_buffer(new UTF8[target_capacity]);
141  UTF8 *target_ptr = target_buffer.get();
142  UTF8 *target_end_ptr = target_ptr + target_capacity;
143  ConversionResult result = ConvertUTF16toUTF8(&source_ptr, source_end_ptr,
144                                               &target_ptr, target_end_ptr,
145                                               strictConversion);
146
147  if (result == conversionOK) {
148    const char *targetPtr = reinterpret_cast<const char *>(target_buffer.get());
149    return targetPtr;
150  }
151
152  return "";
153}
154
155}  // namespace google_breakpad
156