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 
19 namespace android {
20 namespace img_utils {
21 
~Input()22 Input::~Input() {}
23 
open()24 status_t Input::open() { return OK; }
25 
close()26 status_t Input::close() { return OK; }
27 
skip(size_t count)28 ssize_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