FileInput.cpp revision e507721000647a7d8afe44c63ef7fd04ef8971b1
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 48size_t FileInput::read(uint8_t* buf, size_t offset, size_t count, status_t* err) { 49 if (!mOpen) { 50 ALOGE("%s: Could not read file %s, file not open.", __FUNCTION__, mPath.string()); 51 if (err != NULL) *err = BAD_VALUE; 52 return 0; 53 } 54 55 size_t bytesRead = ::fread(buf + offset, sizeof(uint8_t), count, mFp); 56 int error = ::ferror(mFp); 57 if (error != 0) { 58 ALOGE("%s: Error %d occurred while reading file %s.", __FUNCTION__, error, mPath.string()); 59 if (err != NULL) *err = BAD_VALUE; 60 } 61 return bytesRead; 62} 63 64status_t FileInput::close() { 65 if(!mOpen) { 66 ALOGW("%s: Close called when file %s already close.", __FUNCTION__, mPath.string()); 67 return OK; 68 } 69 70 status_t ret = OK; 71 if(::fclose(mFp) != 0) { 72 ALOGE("%s: Failed to close file %s.", __FUNCTION__, mPath.string()); 73 ret = BAD_VALUE; 74 } 75 mOpen = false; 76 return OK; 77} 78 79} /*namespace img_utils*/ 80} /*namespace android*/ 81