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      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 
     21 namespace android {
     22 namespace img_utils {
     23 
     24 FileInput::FileInput(String8 path) : mFp(NULL), mPath(path), mOpen(false) {}
     25 
     26 FileInput::~FileInput() {
     27     if (mOpen) {
     28         ALOGE("%s: FileInput destroyed without calling close!", __FUNCTION__);
     29         close();
     30     }
     31 
     32 }
     33 
     34 status_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 
     48 ssize_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 
     69 status_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 ret;
     82 }
     83 
     84 } /*namespace img_utils*/
     85 } /*namespace android*/
     86