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()22Input::~Input() {} 23 open()24status_t Input::open() { return OK; } 25 close()26status_t Input::close() { return OK; } 27 skip(size_t count)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