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130 lines
3.2 KiB
130 lines
3.2 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "MtpStringBuffer"
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#include <codecvt>
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#include <locale>
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#include <string>
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#include <vector>
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#include "MtpDataPacket.h"
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#include "MtpStringBuffer.h"
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namespace {
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const char * utf16_cerror = "__CONVERSION_ERROR__";
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const char16_t * utf8_cerror = u"__CONVERSION_ERROR__";
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std::wstring_convert<std::codecvt_utf8_utf16<char16_t>,char16_t> gConvert(utf16_cerror, utf8_cerror);
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static std::string utf16ToUtf8(std::u16string input_str) {
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std::string conversion = gConvert.to_bytes(input_str);
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if (conversion == utf16_cerror) {
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ALOGE("Unable to convert UTF-16 string to UTF-8");
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return "";
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} else {
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return conversion;
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}
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}
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static std::u16string utf8ToUtf16(std::string input_str) {
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std::u16string conversion = gConvert.from_bytes(input_str);
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if (conversion == utf8_cerror) {
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ALOGE("Unable to convert UTF-8 string to UTF-16");
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return u"";
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} else {
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return conversion;
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}
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}
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} // namespace
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namespace android {
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MtpStringBuffer::MtpStringBuffer(const char* src)
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{
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set(src);
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}
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MtpStringBuffer::MtpStringBuffer(const uint16_t* src)
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{
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set(src);
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}
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MtpStringBuffer::MtpStringBuffer(const MtpStringBuffer& src)
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{
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mString = src.mString;
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}
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void MtpStringBuffer::set(const char* src) {
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mString = std::string(src);
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}
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void MtpStringBuffer::set(const uint16_t* src) {
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mString = utf16ToUtf8(std::u16string((const char16_t*)src));
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}
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bool MtpStringBuffer::readFromPacket(MtpDataPacket* packet) {
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uint8_t count;
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if (!packet->getUInt8(count))
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return false;
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if (count == 0)
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return true;
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std::vector<char16_t> buffer(count);
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for (int i = 0; i < count; i++) {
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uint16_t ch;
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if (!packet->getUInt16(ch))
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return false;
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buffer[i] = ch;
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}
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if (buffer[count-1] != '\0') {
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ALOGE("Mtp string not null terminated\n");
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return false;
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}
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mString = utf16ToUtf8(std::u16string(buffer.data()));
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return true;
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}
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void MtpStringBuffer::writeToPacket(MtpDataPacket* packet) const {
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std::u16string src16 = utf8ToUtf16(mString);
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int count = src16.length();
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if (count == 0) {
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packet->putUInt8(0);
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return;
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}
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packet->putUInt8(std::min(count + 1, MTP_STRING_MAX_CHARACTER_NUMBER));
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int i = 0;
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for (char16_t &c : src16) {
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if (i == MTP_STRING_MAX_CHARACTER_NUMBER - 1) {
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// Leave a slot for null termination.
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ALOGI("Mtp truncating long string\n");
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break;
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}
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packet->putUInt16(c);
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i++;
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}
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// only terminate with zero if string is not empty
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packet->putUInt16(0);
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}
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} // namespace android
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