59b516a118
The 3rdparty files are now compiled as part of the corresponding input method, so that the project files can be written without using platform specific linker flags.
132 lines
3.1 KiB
C++
132 lines
3.1 KiB
C++
/*
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* Copyright (C) 2009 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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#include "../include/utf16reader.h"
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namespace ime_pinyin {
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#define MIN_BUF_LEN 128
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#define MAX_BUF_LEN 65535
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Utf16Reader::Utf16Reader() {
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fp_ = NULL;
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buffer_ = NULL;
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buffer_total_len_ = 0;
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buffer_next_pos_ = 0;
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buffer_valid_len_ = 0;
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}
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Utf16Reader::~Utf16Reader() {
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if (NULL != fp_)
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fclose(fp_);
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if (NULL != buffer_)
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delete [] buffer_;
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}
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bool Utf16Reader::open(const char* filename, size_t buffer_len) {
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if (filename == NULL)
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return false;
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if (buffer_len < MIN_BUF_LEN)
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buffer_len = MIN_BUF_LEN;
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else if (buffer_len > MAX_BUF_LEN)
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buffer_len = MAX_BUF_LEN;
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buffer_total_len_ = buffer_len;
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if (NULL != buffer_)
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delete [] buffer_;
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buffer_ = new char16[buffer_total_len_];
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if (NULL == buffer_)
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return false;
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if ((fp_ = fopen(filename, "rb")) == NULL)
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return false;
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// the UTF16 file header, skip
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char16 header;
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if (fread(&header, sizeof(header), 1, fp_) != 1 || header != 0xfeff) {
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fclose(fp_);
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fp_ = NULL;
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return false;
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}
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return true;
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}
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char16* Utf16Reader::readline(char16* read_buf, size_t max_len) {
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if (NULL == fp_ || NULL == read_buf || 0 == max_len)
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return NULL;
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size_t ret_len = 0;
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do {
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if (buffer_valid_len_ == 0) {
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buffer_next_pos_ = 0;
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buffer_valid_len_ = fread(buffer_, sizeof(char16),
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buffer_total_len_, fp_);
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if (buffer_valid_len_ == 0) {
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if (0 == ret_len)
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return NULL;
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read_buf[ret_len] = (char16)'\0';
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return read_buf;
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}
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}
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for (size_t i = 0; i < buffer_valid_len_; i++) {
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if (i == max_len - 1 ||
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buffer_[buffer_next_pos_ + i] == (char16)'\n') {
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if (ret_len + i > 0 && read_buf[ret_len + i - 1] == (char16)'\r') {
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read_buf[ret_len + i - 1] = (char16)'\0';
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} else {
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read_buf[ret_len + i] = (char16)'\0';
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}
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i++;
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buffer_next_pos_ += i;
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buffer_valid_len_ -= i;
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if (buffer_next_pos_ == buffer_total_len_) {
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buffer_next_pos_ = 0;
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buffer_valid_len_ = 0;
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}
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return read_buf;
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} else {
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read_buf[ret_len + i] = buffer_[buffer_next_pos_ + i];
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}
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}
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ret_len += buffer_valid_len_;
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buffer_valid_len_ = 0;
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} while (true);
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// Never reach here
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return NULL;
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}
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bool Utf16Reader::close() {
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if (NULL != fp_)
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fclose(fp_);
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fp_ = NULL;
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if (NULL != buffer_)
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delete [] buffer_;
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buffer_ = NULL;
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return true;
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}
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} // namespace ime_pinyin
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