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
31using namespace android;
32
33#define FAILURE (-1)
34
35String8 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
57int 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
78void 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
95void 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