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 17 //#define LOG_NDEBUG 0 18 #define LOG_TAG "ReadWriteUtils" 19 #include <utils/Log.h> 20 21 #include <ReadWriteUtils.h> 22 #include <sys/mman.h> 23 #include <sys/stat.h> 24 #include <sys/types.h> 25 #include <fcntl.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <unistd.h> 29 #include <utils/String8.h> 30 31 using namespace android; 32 33 #define FAILURE (-1) 34 35 String8 ReadWriteUtils::readBytes(const String8& filePath) { 36 FILE* file = NULL; 37 file = fopen(filePath.string(), "r"); 38 39 String8 string(""); 40 if (NULL != file) { 41 int fd = fileno(file); 42 struct stat sb; 43 44 if (fstat(fd, &sb) == 0 && sb.st_size > 0) { 45 off64_t length = sb.st_size; 46 char* bytes = new char[length]; 47 if (length == read(fd, (void*) bytes, length)) { 48 string.append(bytes, length); 49 } 50 delete[] bytes; 51 } 52 fclose(file); 53 } 54 return string; 55 } 56 57 int ReadWriteUtils::readBytes(const String8& filePath, char** buffer) { 58 FILE* file = NULL; 59 file = fopen(filePath.string(), "r"); 60 off64_t length = 0; 61 62 if (NULL != file) { 63 int fd = fileno(file); 64 struct stat sb; 65 66 if (fstat(fd, &sb) == 0 && sb.st_size > 0) { 67 length = sb.st_size; 68 *buffer = new char[length]; 69 if (length != read(fd, (void*) *buffer, length)) { 70 length = FAILURE; 71 } 72 } 73 fclose(file); 74 } 75 return length; 76 } 77 78 void ReadWriteUtils::writeToFile(const String8& filePath, const String8& data) { 79 FILE* file = NULL; 80 file = fopen(filePath.string(), "w+"); 81 82 if (NULL != file) { 83 int fd = fileno(file); 84 85 int size = data.size(); 86 if (FAILURE != ftruncate(fd, size)) { 87 if (size != write(fd, data.string(), size)) { 88 ALOGE("Failed to write the data to: %s", filePath.string()); 89 } 90 } 91 fclose(file); 92 } 93 } 94 95 void ReadWriteUtils::appendToFile(const String8& filePath, const String8& data) { 96 FILE* file = NULL; 97 file = fopen(filePath.string(), "a+"); 98 99 if (NULL != file) { 100 int fd = fileno(file); 101 102 int size = data.size(); 103 if (size != write(fd, data.string(), size)) { 104 ALOGE("Failed to write the data to: %s", filePath.string()); 105 } 106 fclose(file); 107 } 108 } 109 110
