Leon Scroggins III | 9732e29 | 2019-12-16 10:26:57 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 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 "aassetstreamadaptor.h" |
| 18 | |
| 19 | #include <log/log.h> |
| 20 | |
| 21 | AAssetStreamAdaptor::AAssetStreamAdaptor(AAsset* asset) |
| 22 | : mAAsset(asset) |
| 23 | { |
| 24 | } |
| 25 | |
| 26 | bool AAssetStreamAdaptor::rewind() { |
| 27 | off64_t pos = AAsset_seek64(mAAsset, 0, SEEK_SET); |
| 28 | if (pos == (off64_t)-1) { |
| 29 | ALOGE("rewind failed!"); |
| 30 | return false; |
| 31 | } |
| 32 | return true; |
| 33 | } |
| 34 | |
| 35 | size_t AAssetStreamAdaptor::getLength() const { |
| 36 | return AAsset_getLength64(mAAsset); |
| 37 | } |
| 38 | |
| 39 | bool AAssetStreamAdaptor::isAtEnd() const { |
| 40 | return AAsset_getRemainingLength64(mAAsset) == 0; |
| 41 | } |
| 42 | |
| 43 | SkStreamRewindable* AAssetStreamAdaptor::onDuplicate() const { |
| 44 | // Cannot sensibly create a duplicate, since each AAssetStreamAdaptor |
| 45 | // would be modifying the same AAsset. |
| 46 | //return new AAssetStreamAdaptor(mAAsset); |
| 47 | return nullptr; |
| 48 | } |
| 49 | |
| 50 | bool AAssetStreamAdaptor::hasPosition() const { |
| 51 | return AAsset_seek64(mAAsset, 0, SEEK_CUR) != -1; |
| 52 | } |
| 53 | |
| 54 | size_t AAssetStreamAdaptor::getPosition() const { |
| 55 | const off64_t offset = AAsset_seek64(mAAsset, 0, SEEK_CUR); |
| 56 | if (offset == -1) { |
| 57 | ALOGE("getPosition failed!"); |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | return offset; |
| 62 | } |
| 63 | |
| 64 | bool AAssetStreamAdaptor::seek(size_t position) { |
| 65 | if (AAsset_seek64(mAAsset, position, SEEK_SET) == -1) { |
| 66 | ALOGE("seek failed!"); |
| 67 | return false; |
| 68 | } |
| 69 | |
| 70 | return true; |
| 71 | } |
| 72 | |
| 73 | bool AAssetStreamAdaptor::move(long offset) { |
| 74 | if (AAsset_seek64(mAAsset, offset, SEEK_CUR) == -1) { |
| 75 | ALOGE("move failed!"); |
| 76 | return false; |
| 77 | } |
| 78 | |
| 79 | return true; |
| 80 | } |
| 81 | |
| 82 | size_t AAssetStreamAdaptor::read(void* buffer, size_t size) { |
| 83 | ssize_t amount; |
| 84 | |
| 85 | if (!buffer) { |
| 86 | if (!size) { |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | // asset->seek returns new total offset |
| 91 | // we want to return amount that was skipped |
| 92 | const off64_t oldOffset = AAsset_seek64(mAAsset, 0, SEEK_CUR); |
| 93 | if (oldOffset == -1) { |
| 94 | ALOGE("seek(oldOffset) failed!"); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | const off64_t newOffset = AAsset_seek64(mAAsset, size, SEEK_CUR); |
| 99 | if (-1 == newOffset) { |
| 100 | ALOGE("seek(%zu) failed!", size); |
| 101 | return 0; |
| 102 | } |
| 103 | amount = newOffset - oldOffset; |
| 104 | } else { |
| 105 | amount = AAsset_read(mAAsset, buffer, size); |
| 106 | } |
| 107 | |
| 108 | if (amount < 0) { |
| 109 | amount = 0; |
| 110 | } |
| 111 | return amount; |
| 112 | } |
| 113 | |
| 114 | const void* AAssetStreamAdaptor::getMemoryBase() { |
| 115 | return AAsset_getBuffer(mAAsset); |
| 116 | } |
| 117 | |