1 /* 2 * Copyright (C) 2010 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 "Utils.h" 18 #include "SkUtils.h" 19 20 using namespace android; 21 22 AssetStreamAdaptor::AssetStreamAdaptor(Asset* asset, OwnAsset ownAsset, 23 HasMemoryBase hasMemoryBase) 24 : fAsset(asset) 25 , fMemoryBase(kYes_HasMemoryBase == hasMemoryBase ? 26 asset->getBuffer(false) : NULL) 27 , fOwnAsset(ownAsset) 28 { 29 } 30 31 AssetStreamAdaptor::~AssetStreamAdaptor() { 32 if (kYes_OwnAsset == fOwnAsset) { 33 delete fAsset; 34 } 35 } 36 37 bool AssetStreamAdaptor::rewind() { 38 off64_t pos = fAsset->seek(0, SEEK_SET); 39 if (pos == (off64_t)-1) { 40 SkDebugf("----- fAsset->seek(rewind) failed\n"); 41 return false; 42 } 43 return true; 44 } 45 46 size_t AssetStreamAdaptor::getLength() const { 47 return fAsset->getLength(); 48 } 49 50 bool AssetStreamAdaptor::isAtEnd() const { 51 return fAsset->getRemainingLength() == 0; 52 } 53 54 SkStreamRewindable* AssetStreamAdaptor::duplicate() const { 55 // Cannot create a duplicate, since each AssetStreamAdaptor 56 // would be modifying the Asset. 57 //return new AssetStreamAdaptor(fAsset); 58 return NULL; 59 } 60 61 size_t AssetStreamAdaptor::read(void* buffer, size_t size) { 62 ssize_t amount; 63 64 if (NULL == buffer) { 65 if (0 == size) { 66 return 0; 67 } 68 // asset->seek returns new total offset 69 // we want to return amount that was skipped 70 71 off64_t oldOffset = fAsset->seek(0, SEEK_CUR); 72 if (-1 == oldOffset) { 73 SkDebugf("---- fAsset->seek(oldOffset) failed\n"); 74 return 0; 75 } 76 off64_t newOffset = fAsset->seek(size, SEEK_CUR); 77 if (-1 == newOffset) { 78 SkDebugf("---- fAsset->seek(%d) failed\n", size); 79 return 0; 80 } 81 amount = newOffset - oldOffset; 82 } else { 83 amount = fAsset->read(buffer, size); 84 if (amount <= 0) { 85 SkDebugf("---- fAsset->read(%d) returned %d\n", size, amount); 86 } 87 } 88 89 if (amount < 0) { 90 amount = 0; 91 } 92 return amount; 93 } 94 95 SkMemoryStream* android::CopyAssetToStream(Asset* asset) { 96 if (NULL == asset) { 97 return NULL; 98 } 99 100 off64_t size = asset->seek(0, SEEK_SET); 101 if ((off64_t)-1 == size) { 102 SkDebugf("---- copyAsset: asset rewind failed\n"); 103 return NULL; 104 } 105 106 size = asset->getLength(); 107 if (size <= 0) { 108 SkDebugf("---- copyAsset: asset->getLength() returned %d\n", size); 109 return NULL; 110 } 111 112 SkMemoryStream* stream = new SkMemoryStream(size); 113 void* data = const_cast<void*>(stream->getMemoryBase()); 114 off64_t len = asset->read(data, size); 115 if (len != size) { 116 SkDebugf("---- copyAsset: asset->read(%d) returned %d\n", size, len); 117 delete stream; 118 stream = NULL; 119 } 120 return stream; 121 } 122 123 jobject android::nullObjectReturn(const char msg[]) { 124 if (msg) { 125 SkDebugf("--- %s\n", msg); 126 } 127 return NULL; 128 } 129