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/Input.h>
18
19namespace android {
20namespace img_utils {
21
22Input::~Input() {}
23
24status_t Input::open() { return OK; }
25
26status_t Input::close() { return OK; }
27
28ssize_t Input::skip(size_t count) {
29    const size_t SKIP_BUF_SIZE = 1024;
30    uint8_t skipBuf[SKIP_BUF_SIZE];
31
32    size_t remaining = count;
33    while (remaining > 0) {
34        size_t amt = (SKIP_BUF_SIZE > remaining) ? remaining : SKIP_BUF_SIZE;
35        ssize_t ret = read(skipBuf, 0, amt);
36        if (ret < 0) {
37            if(ret == NOT_ENOUGH_DATA) {
38                // End of file encountered
39                if (remaining == count) {
40                    // Read no bytes, return EOF
41                    return NOT_ENOUGH_DATA;
42                } else {
43                    // Return num bytes read
44                    return count - remaining;
45                }
46            }
47            // Return error code.
48            return ret;
49        }
50        remaining -= ret;
51    }
52    return count;
53}
54
55} /*namespace img_utils*/
56} /*namespace android*/
57
58