| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "Utils.h" |
| #include "SkUtils.h" |
| |
| using namespace android; |
| |
| bool AssetStreamAdaptor::rewind() { |
| off64_t pos = fAsset->seek(0, SEEK_SET); |
| if (pos == (off64_t)-1) { |
| SkDebugf("----- fAsset->seek(rewind) failed\n"); |
| return false; |
| } |
| return true; |
| } |
| |
| size_t AssetStreamAdaptor::read(void* buffer, size_t size) { |
| ssize_t amount; |
| |
| if (NULL == buffer) { |
| if (0 == size) { // caller is asking us for our total length |
| return fAsset->getLength(); |
| } |
| // asset->seek returns new total offset |
| // we want to return amount that was skipped |
| |
| off64_t oldOffset = fAsset->seek(0, SEEK_CUR); |
| if (-1 == oldOffset) { |
| SkDebugf("---- fAsset->seek(oldOffset) failed\n"); |
| return 0; |
| } |
| off64_t newOffset = fAsset->seek(size, SEEK_CUR); |
| if (-1 == newOffset) { |
| SkDebugf("---- fAsset->seek(%d) failed\n", size); |
| return 0; |
| } |
| amount = newOffset - oldOffset; |
| } else { |
| amount = fAsset->read(buffer, size); |
| if (amount <= 0) { |
| SkDebugf("---- fAsset->read(%d) returned %d\n", size, amount); |
| } |
| } |
| |
| if (amount < 0) { |
| amount = 0; |
| } |
| return amount; |
| } |
| |
| jobject android::nullObjectReturn(const char msg[]) { |
| if (msg) { |
| SkDebugf("--- %s\n", msg); |
| } |
| return NULL; |
| } |