| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "hdfs.h" |
| |
| int main(int argc, char **argv) { |
| |
| if (argc != 4) { |
| fprintf(stderr, "Usage: hdfs_read <filename> <filesize> <buffersize>\n"); |
| exit(-1); |
| } |
| |
| hdfsFS fs = hdfsConnect("default", 0); |
| if (!fs) { |
| fprintf(stderr, "Oops! Failed to connect to hdfs!\n"); |
| exit(-1); |
| } |
| |
| const char* rfile = argv[1]; |
| tSize fileTotalSize = strtoul(argv[2], NULL, 10); |
| tSize bufferSize = strtoul(argv[3], NULL, 10); |
| |
| hdfsFile readFile = hdfsOpenFile(fs, rfile, O_RDONLY, bufferSize, 0, 0); |
| if (!readFile) { |
| fprintf(stderr, "Failed to open %s for writing!\n", rfile); |
| exit(-2); |
| } |
| |
| // data to be written to the file |
| char* buffer = malloc(sizeof(char) * bufferSize); |
| if(buffer == NULL) { |
| return -2; |
| } |
| |
| // read from the file |
| tSize curSize = bufferSize; |
| for (; curSize == bufferSize;) { |
| curSize = hdfsRead(fs, readFile, (void*)buffer, curSize); |
| } |
| |
| |
| free(buffer); |
| hdfsCloseFile(fs, readFile); |
| hdfsDisconnect(fs); |
| |
| return 0; |
| } |
| |
| /** |
| * vim: ts=4: sw=4: et: |
| */ |
| |