Mike Lockwood | 56118b5 | 2010-05-11 17:16:59 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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 | |
Mike Lockwood | 3e6616d | 2010-06-29 18:11:52 -0400 | [diff] [blame] | 17 | #define LOG_TAG "MtpStringBuffer" |
| 18 | |
Mike Lockwood | 56118b5 | 2010-05-11 17:16:59 -0400 | [diff] [blame] | 19 | #include <string.h> |
| 20 | |
| 21 | #include "MtpDataPacket.h" |
| 22 | #include "MtpStringBuffer.h" |
| 23 | |
Mike Lockwood | 8d3257a | 2010-05-14 10:10:36 -0400 | [diff] [blame] | 24 | namespace android { |
Mike Lockwood | 56118b5 | 2010-05-11 17:16:59 -0400 | [diff] [blame] | 25 | |
| 26 | MtpStringBuffer::MtpStringBuffer() |
| 27 | : mCharCount(0), |
| 28 | mByteCount(1) |
| 29 | { |
| 30 | mBuffer[0] = 0; |
| 31 | } |
| 32 | |
| 33 | MtpStringBuffer::MtpStringBuffer(const char* src) |
| 34 | : mCharCount(0), |
| 35 | mByteCount(1) |
| 36 | { |
| 37 | set(src); |
| 38 | } |
| 39 | |
Mike Lockwood | a2a2128 | 2010-09-25 21:21:05 -0400 | [diff] [blame] | 40 | MtpStringBuffer::MtpStringBuffer(const uint16_t* src) |
| 41 | : mCharCount(0), |
| 42 | mByteCount(1) |
| 43 | { |
| 44 | set(src); |
| 45 | } |
| 46 | |
Mike Lockwood | 56118b5 | 2010-05-11 17:16:59 -0400 | [diff] [blame] | 47 | MtpStringBuffer::MtpStringBuffer(const MtpStringBuffer& src) |
| 48 | : mCharCount(src.mCharCount), |
| 49 | mByteCount(src.mByteCount) |
| 50 | { |
| 51 | memcpy(mBuffer, src.mBuffer, mByteCount); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | MtpStringBuffer::~MtpStringBuffer() { |
| 56 | } |
| 57 | |
| 58 | void MtpStringBuffer::set(const char* src) { |
| 59 | int length = strlen(src); |
| 60 | if (length >= sizeof(mBuffer)) |
| 61 | length = sizeof(mBuffer) - 1; |
| 62 | memcpy(mBuffer, src, length); |
| 63 | |
| 64 | // count the characters |
| 65 | int count = 0; |
| 66 | char ch; |
| 67 | while ((ch = *src++) != 0) { |
| 68 | if ((ch & 0x80) == 0) { |
| 69 | // single byte character |
| 70 | } else if ((ch & 0xE0) == 0xC0) { |
| 71 | // two byte character |
| 72 | if (! *src++) { |
| 73 | // last character was truncated, so ignore last byte |
| 74 | length--; |
| 75 | break; |
| 76 | } |
| 77 | } else if ((ch & 0xF0) == 0xE0) { |
| 78 | // 3 byte char |
| 79 | if (! *src++) { |
| 80 | // last character was truncated, so ignore last byte |
| 81 | length--; |
| 82 | break; |
| 83 | } |
| 84 | if (! *src++) { |
| 85 | // last character was truncated, so ignore last two bytes |
| 86 | length -= 2; |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | count++; |
| 91 | } |
| 92 | |
| 93 | mByteCount = length + 1; |
| 94 | mBuffer[length] = 0; |
| 95 | mCharCount = count; |
| 96 | } |
| 97 | |
Mike Lockwood | a2a2128 | 2010-09-25 21:21:05 -0400 | [diff] [blame] | 98 | void MtpStringBuffer::set(const uint16_t* src) { |
| 99 | int count = 0; |
| 100 | uint16_t ch; |
| 101 | uint8_t* dest = mBuffer; |
| 102 | |
| 103 | while ((ch = *src++) != 0 && count < 255) { |
| 104 | if (ch >= 0x0800) { |
| 105 | *dest++ = (uint8_t)(0xE0 | (ch >> 12)); |
| 106 | *dest++ = (uint8_t)(0x80 | ((ch >> 6) & 0x3F)); |
| 107 | *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); |
| 108 | } else if (ch >= 0x80) { |
| 109 | *dest++ = (uint8_t)(0xC0 | (ch >> 6)); |
| 110 | *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); |
| 111 | } else { |
| 112 | *dest++ = ch; |
| 113 | } |
| 114 | count++; |
| 115 | } |
| 116 | *dest++ = 0; |
| 117 | mCharCount = count; |
| 118 | mByteCount = dest - mBuffer; |
| 119 | } |
| 120 | |
Mike Lockwood | 56118b5 | 2010-05-11 17:16:59 -0400 | [diff] [blame] | 121 | void MtpStringBuffer::readFromPacket(MtpDataPacket* packet) { |
| 122 | int count = packet->getUInt8(); |
| 123 | uint8_t* dest = mBuffer; |
| 124 | for (int i = 0; i < count; i++) { |
| 125 | uint16_t ch = packet->getUInt16(); |
| 126 | if (ch >= 0x0800) { |
| 127 | *dest++ = (uint8_t)(0xE0 | (ch >> 12)); |
| 128 | *dest++ = (uint8_t)(0x80 | ((ch >> 6) & 0x3F)); |
| 129 | *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); |
| 130 | } else if (ch >= 0x80) { |
| 131 | *dest++ = (uint8_t)(0xC0 | (ch >> 6)); |
| 132 | *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); |
| 133 | } else { |
| 134 | *dest++ = ch; |
| 135 | } |
| 136 | } |
| 137 | *dest++ = 0; |
| 138 | mCharCount = count; |
| 139 | mByteCount = dest - mBuffer; |
| 140 | } |
| 141 | |
| 142 | void MtpStringBuffer::writeToPacket(MtpDataPacket* packet) const { |
| 143 | int count = mCharCount; |
| 144 | const uint8_t* src = mBuffer; |
Mike Lockwood | 9e83786 | 2010-08-18 12:31:09 -0400 | [diff] [blame] | 145 | packet->putUInt8(count > 0 ? count + 1 : 0); |
Mike Lockwood | 56118b5 | 2010-05-11 17:16:59 -0400 | [diff] [blame] | 146 | |
| 147 | // expand utf8 to 16 bit chars |
| 148 | for (int i = 0; i < count; i++) { |
| 149 | uint16_t ch; |
| 150 | uint16_t ch1 = *src++; |
| 151 | if ((ch1 & 0x80) == 0) { |
| 152 | // single byte character |
| 153 | ch = ch1; |
| 154 | } else if ((ch1 & 0xE0) == 0xC0) { |
| 155 | // two byte character |
| 156 | uint16_t ch2 = *src++; |
| 157 | ch = ((ch1 & 0x1F) << 6) | (ch2 & 0x3F); |
| 158 | } else { |
| 159 | // three byte character |
| 160 | uint16_t ch2 = *src++; |
| 161 | uint16_t ch3 = *src++; |
| 162 | ch = ((ch1 & 0x0F) << 12) | ((ch2 & 0x3F) << 6) | (ch3 & 0x3F); |
| 163 | } |
| 164 | packet->putUInt16(ch); |
| 165 | } |
Mike Lockwood | 9e83786 | 2010-08-18 12:31:09 -0400 | [diff] [blame] | 166 | // only terminate with zero if string is not empty |
| 167 | if (count > 0) |
| 168 | packet->putUInt16(0); |
Mike Lockwood | 56118b5 | 2010-05-11 17:16:59 -0400 | [diff] [blame] | 169 | } |
Mike Lockwood | 8d3257a | 2010-05-14 10:10:36 -0400 | [diff] [blame] | 170 | |
| 171 | } // namespace android |