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      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