91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
// Copyright (c) 2017, Baidu.com, Inc. All Rights Reserved
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// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "exec/local_file_reader.h"
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namespace palo {
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LocalFileReader::LocalFileReader(const std::string& path, int64_t start_offset)
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: _path(path), _start_offset(start_offset), _eof(false), _fp(nullptr) {
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}
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LocalFileReader::~LocalFileReader() {
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close();
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}
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Status LocalFileReader::open() {
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_fp = fopen(_path.c_str(), "r");
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if (_fp == nullptr) {
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char err_buf[64];
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std::stringstream ss;
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ss << "Open file failed. path=" << _path
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<< ", error=" << strerror_r(errno, err_buf, 64);
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return Status(ss.str());
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}
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if (_start_offset != 0) {
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int res = fseek(_fp, _start_offset, SEEK_SET);
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if (res != 0) {
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char err_buf[64];
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std::stringstream ss;
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ss << "Seek to start_offset failed. offset=" << _start_offset
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<< ", error=" << strerror_r(errno, err_buf, 64);
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return Status(ss.str());
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}
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}
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return Status::OK;
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}
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Status LocalFileReader::read(uint8_t* buf, size_t* buf_len, bool* eof) {
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if (_eof) {
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*buf_len = 0;
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*eof = true;
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return Status::OK;
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}
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size_t read_len = fread(buf, 1, *buf_len, _fp);
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if (read_len < *buf_len) {
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if (ferror(_fp)) {
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char err_buf[64];
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std::stringstream ss;
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ss << "Read file failed. path=" << _path
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<< ", error=" << strerror_r(errno, err_buf, 64);
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return Status(ss.str());
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} else if (feof(_fp)) {
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*buf_len = read_len;
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_eof = true;
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if (*buf_len == 0) {
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*eof = true;
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}
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} else {
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return Status("Unknown read failed.");
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}
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}
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return Status::OK;
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}
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void LocalFileReader::close() {
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if (_fp != nullptr) {
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fclose(_fp);
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_fp = nullptr;
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}
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}
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}
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