FileInput.cpp revision 4510de26e5361f3a9f07057ec6f26483c888c1fa 
1/*
2 * Copyright 2014 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#include <img_utils/FileInput.h>
18
19#include <utils/Log.h>
20
21namespace android {
22namespace img_utils {
23
24FileInput::FileInput(String8 path) : mFp(NULL), mPath(path), mOpen(false) {}
25
26FileInput::~FileInput() {
27    if (mOpen) {
28        ALOGE("%s: FileInput destroyed without calling close!", __FUNCTION__);
29        close();
30    }
31
32}
33
34status_t FileInput::open() {
35    if (mOpen) {
36        ALOGW("%s: Open called when file %s already open.", __FUNCTION__, mPath.string());
37        return OK;
38    }
39    mFp = ::fopen(mPath, "rb");
40    if (!mFp) {
41        ALOGE("%s: Could not open file %s", __FUNCTION__, mPath.string());
42        return BAD_VALUE;
43    }
44    mOpen = true;
45    return OK;
46}
47
48ssize_t FileInput::read(uint8_t* buf, size_t offset, size_t count) {
49    if (!mOpen) {
50        ALOGE("%s: Could not read file %s, file not open.", __FUNCTION__, mPath.string());
51        return BAD_VALUE;
52    }
53
54    size_t bytesRead = ::fread(buf + offset, sizeof(uint8_t), count, mFp);
55    int error = ::ferror(mFp);
56    if (error != 0) {
57        ALOGE("%s: Error %d occurred while reading file %s.", __FUNCTION__, error, mPath.string());
58        return BAD_VALUE;
59    }
60
61    // End of file reached
62    if (::feof(mFp) != 0 && bytesRead == 0) {
63        return NOT_ENOUGH_DATA;
64    }
65
66    return bytesRead;
67}
68
69status_t FileInput::close() {
70    if(!mOpen) {
71        ALOGW("%s: Close called when file %s already close.", __FUNCTION__, mPath.string());
72        return OK;
73    }
74
75    status_t ret = OK;
76    if(::fclose(mFp) != 0) {
77        ALOGE("%s: Failed to close file %s.", __FUNCTION__, mPath.string());
78        ret = BAD_VALUE;
79    }
80    mOpen = false;
81    return OK;
82}
83
84} /*namespace img_utils*/
85} /*namespace android*/
86