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      1 /*
      2  * Copyright (C) 2009 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 //#define LOG_NDEBUG 0
     17 #define LOG_TAG "DataSourceBase"
     18 
     19 #include <media/DataSourceBase.h>
     20 #include <media/stagefright/foundation/ByteUtils.h>
     21 #include <media/stagefright/MediaErrors.h>
     22 #include <utils/String8.h>
     23 
     24 namespace android {
     25 
     26 bool DataSourceBase::getUInt16(off64_t offset, uint16_t *x) {
     27     *x = 0;
     28 
     29     uint8_t byte[2];
     30     if (readAt(offset, byte, 2) != 2) {
     31         return false;
     32     }
     33 
     34     *x = (byte[0] << 8) | byte[1];
     35 
     36     return true;
     37 }
     38 
     39 bool DataSourceBase::getUInt24(off64_t offset, uint32_t *x) {
     40     *x = 0;
     41 
     42     uint8_t byte[3];
     43     if (readAt(offset, byte, 3) != 3) {
     44         return false;
     45     }
     46 
     47     *x = (byte[0] << 16) | (byte[1] << 8) | byte[2];
     48 
     49     return true;
     50 }
     51 
     52 bool DataSourceBase::getUInt32(off64_t offset, uint32_t *x) {
     53     *x = 0;
     54 
     55     uint32_t tmp;
     56     if (readAt(offset, &tmp, 4) != 4) {
     57         return false;
     58     }
     59 
     60     *x = ntohl(tmp);
     61 
     62     return true;
     63 }
     64 
     65 bool DataSourceBase::getUInt64(off64_t offset, uint64_t *x) {
     66     *x = 0;
     67 
     68     uint64_t tmp;
     69     if (readAt(offset, &tmp, 8) != 8) {
     70         return false;
     71     }
     72 
     73     *x = ntoh64(tmp);
     74 
     75     return true;
     76 }
     77 
     78 bool DataSourceBase::getUInt16Var(off64_t offset, uint16_t *x, size_t size) {
     79     if (size == 2) {
     80         return getUInt16(offset, x);
     81     }
     82     if (size == 1) {
     83         uint8_t tmp;
     84         if (readAt(offset, &tmp, 1) == 1) {
     85             *x = tmp;
     86             return true;
     87         }
     88     }
     89     return false;
     90 }
     91 
     92 bool DataSourceBase::getUInt32Var(off64_t offset, uint32_t *x, size_t size) {
     93     if (size == 4) {
     94         return getUInt32(offset, x);
     95     }
     96     if (size == 2) {
     97         uint16_t tmp;
     98         if (getUInt16(offset, &tmp)) {
     99             *x = tmp;
    100             return true;
    101         }
    102     }
    103     return false;
    104 }
    105 
    106 bool DataSourceBase::getUInt64Var(off64_t offset, uint64_t *x, size_t size) {
    107     if (size == 8) {
    108         return getUInt64(offset, x);
    109     }
    110     if (size == 4) {
    111         uint32_t tmp;
    112         if (getUInt32(offset, &tmp)) {
    113             *x = tmp;
    114             return true;
    115         }
    116     }
    117     return false;
    118 }
    119 
    120 status_t DataSourceBase::getSize(off64_t *size) {
    121     *size = 0;
    122 
    123     return ERROR_UNSUPPORTED;
    124 }
    125 
    126 bool DataSourceBase::getUri(char *uriString __unused, size_t bufferSize __unused) {
    127     return false;
    128 }
    129 
    130 }  // namespace android
    131