1 /*
2 * Copyright (C) 2015 The Android Open Source Project
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 #include <unicode/utf.h>
18 #include <unicode/utf8.h>
19 #include <cstdlib>
20 #include <cutils/log.h>
21 #include <vector>
22 #include <string>
23
24 namespace minikin {
25
26 // src is of the form "U+1F431 | 'h' 'i'". Position of "|" gets saved to offset if non-null.
27 // Size is returned in an out parameter because gtest needs a void return for ASSERT to work.
ParseUnicode(uint16_t * buf,size_t buf_size,const char * src,size_t * result_size,size_t * offset)28 void ParseUnicode(uint16_t* buf, size_t buf_size, const char* src, size_t* result_size,
29 size_t* offset) {
30 size_t input_ix = 0;
31 size_t output_ix = 0;
32 bool seen_offset = false;
33
34 while (src[input_ix] != 0) {
35 switch (src[input_ix]) {
36 case '\'':
37 // single ASCII char
38 LOG_ALWAYS_FATAL_IF(static_cast<uint8_t>(src[input_ix]) >= 0x80);
39 input_ix++;
40 LOG_ALWAYS_FATAL_IF(src[input_ix] == 0);
41 LOG_ALWAYS_FATAL_IF(output_ix >= buf_size);
42 buf[output_ix++] = (uint16_t)src[input_ix++];
43 LOG_ALWAYS_FATAL_IF(src[input_ix] != '\'');
44 input_ix++;
45 break;
46 case 'u':
47 case 'U': {
48 // Unicode codepoint in hex syntax
49 input_ix++;
50 LOG_ALWAYS_FATAL_IF(src[input_ix] != '+');
51 input_ix++;
52 char* endptr = (char*)src + input_ix;
53 unsigned long int codepoint = strtoul(src + input_ix, &endptr, 16);
54 size_t num_hex_digits = endptr - (src + input_ix);
55
56 // also triggers on invalid number syntax, digits = 0
57 LOG_ALWAYS_FATAL_IF(num_hex_digits < 4u);
58 LOG_ALWAYS_FATAL_IF(num_hex_digits > 6u);
59 LOG_ALWAYS_FATAL_IF(codepoint > 0x10FFFFu);
60 input_ix += num_hex_digits;
61 if (U16_LENGTH(codepoint) == 1) {
62 LOG_ALWAYS_FATAL_IF(output_ix + 1 > buf_size);
63 buf[output_ix++] = codepoint;
64 } else {
65 // UTF-16 encoding
66 LOG_ALWAYS_FATAL_IF(output_ix + 2 > buf_size);
67 buf[output_ix++] = U16_LEAD(codepoint);
68 buf[output_ix++] = U16_TRAIL(codepoint);
69 }
70 break;
71 }
72 case ' ':
73 input_ix++;
74 break;
75 case '|':
76 LOG_ALWAYS_FATAL_IF(seen_offset);
77 LOG_ALWAYS_FATAL_IF(offset == nullptr);
78 *offset = output_ix;
79 seen_offset = true;
80 input_ix++;
81 break;
82 default:
83 LOG_ALWAYS_FATAL("Unexpected Character");
84 }
85 }
86 LOG_ALWAYS_FATAL_IF(result_size == nullptr);
87 *result_size = output_ix;
88 LOG_ALWAYS_FATAL_IF(!seen_offset && offset != nullptr);
89 }
90
parseUnicodeStringWithOffset(const std::string & in,size_t * offset)91 std::vector<uint16_t> parseUnicodeStringWithOffset(const std::string& in, size_t* offset) {
92 std::unique_ptr<uint16_t[]> buffer(new uint16_t[in.size()]);
93 size_t result_size = 0;
94 ParseUnicode(buffer.get(), in.size(), in.c_str(), &result_size, offset);
95 return std::vector<uint16_t>(buffer.get(), buffer.get() + result_size);
96 }
97
parseUnicodeString(const std::string & in)98 std::vector<uint16_t> parseUnicodeString(const std::string& in) {
99 return parseUnicodeStringWithOffset(in, nullptr);
100 }
101
utf8ToUtf16(const std::string & text)102 std::vector<uint16_t> utf8ToUtf16(const std::string& text) {
103 std::vector<uint16_t> result;
104 int32_t i = 0;
105 const int32_t textLength = static_cast<int32_t>(text.size());
106 uint32_t c = 0;
107 while (i < textLength) {
108 U8_NEXT(text.c_str(), i, textLength, c);
109 if (U16_LENGTH(c) == 1) {
110 result.push_back(c);
111 } else {
112 result.push_back(U16_LEAD(c));
113 result.push_back(U16_TRAIL(c));
114 }
115 }
116 return result;
117 }
118
119 } // namespace minikin
120