Utils.cpp revision 5e49b497ae2019586937aae0e8159292363728b5
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 20using namespace android; 21 22AssetStreamAdaptor::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 31AssetStreamAdaptor::~AssetStreamAdaptor() { 32 if (kYes_OwnAsset == fOwnAsset) { 33 delete fAsset; 34 } 35} 36 37bool 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 46size_t AssetStreamAdaptor::getLength() const { 47 return fAsset->getLength(); 48} 49 50bool AssetStreamAdaptor::isAtEnd() const { 51 return fAsset->getRemainingLength() == 0; 52} 53 54SkStreamRewindable* AssetStreamAdaptor::duplicate() const { 55 SkASSERT(false); 56 // Cannot create a duplicate, since each AssetStreamAdaptor 57 // would be modifying the Asset. 58 //return new AssetStreamAdaptor(fAsset); 59 return NULL; 60} 61 62size_t AssetStreamAdaptor::read(void* buffer, size_t size) { 63 ssize_t amount; 64 65 if (NULL == buffer) { 66 if (0 == size) { 67 return 0; 68 } 69 // asset->seek returns new total offset 70 // we want to return amount that was skipped 71 72 off64_t oldOffset = fAsset->seek(0, SEEK_CUR); 73 if (-1 == oldOffset) { 74 SkDebugf("---- fAsset->seek(oldOffset) failed\n"); 75 return 0; 76 } 77 off64_t newOffset = fAsset->seek(size, SEEK_CUR); 78 if (-1 == newOffset) { 79 SkDebugf("---- fAsset->seek(%d) failed\n", size); 80 return 0; 81 } 82 amount = newOffset - oldOffset; 83 } else { 84 amount = fAsset->read(buffer, size); 85 if (amount <= 0) { 86 SkDebugf("---- fAsset->read(%d) returned %d\n", size, amount); 87 } 88 } 89 90 if (amount < 0) { 91 amount = 0; 92 } 93 return amount; 94} 95 96SkMemoryStream* android::CopyAssetToStream(Asset* asset) { 97 if (NULL == asset) { 98 return NULL; 99 } 100 101 off64_t size = asset->seek(0, SEEK_SET); 102 if ((off64_t)-1 == size) { 103 SkDebugf("---- copyAsset: asset rewind failed\n"); 104 return NULL; 105 } 106 107 size = asset->getLength(); 108 if (size <= 0) { 109 SkDebugf("---- copyAsset: asset->getLength() returned %d\n", size); 110 return NULL; 111 } 112 113 SkMemoryStream* stream = new SkMemoryStream(size); 114 void* data = const_cast<void*>(stream->getMemoryBase()); 115 off64_t len = asset->read(data, size); 116 if (len != size) { 117 SkDebugf("---- copyAsset: asset->read(%d) returned %d\n", size, len); 118 delete stream; 119 stream = NULL; 120 } 121 return stream; 122} 123 124jobject android::nullObjectReturn(const char msg[]) { 125 if (msg) { 126 SkDebugf("--- %s\n", msg); 127 } 128 return NULL; 129} 130