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 bool AssetStreamAdaptor::rewind() { 23 off64_t pos = fAsset->seek(0, SEEK_SET); 24 if (pos == (off64_t)-1) { 25 SkDebugf("----- fAsset->seek(rewind) failed\n"); 26 return false; 27 } 28 return true; 29 } 30 31 size_t AssetStreamAdaptor::read(void* buffer, size_t size) { 32 ssize_t amount; 33 34 if (NULL == buffer) { 35 if (0 == size) { // caller is asking us for our total length 36 return fAsset->getLength(); 37 } 38 // asset->seek returns new total offset 39 // we want to return amount that was skipped 40 41 off64_t oldOffset = fAsset->seek(0, SEEK_CUR); 42 if (-1 == oldOffset) { 43 SkDebugf("---- fAsset->seek(oldOffset) failed\n"); 44 return 0; 45 } 46 off64_t newOffset = fAsset->seek(size, SEEK_CUR); 47 if (-1 == newOffset) { 48 SkDebugf("---- fAsset->seek(%d) failed\n", size); 49 return 0; 50 } 51 amount = newOffset - oldOffset; 52 } else { 53 amount = fAsset->read(buffer, size); 54 if (amount <= 0) { 55 SkDebugf("---- fAsset->read(%d) returned %d\n", size, amount); 56 } 57 } 58 59 if (amount < 0) { 60 amount = 0; 61 } 62 return amount; 63 } 64 65 jobject android::nullObjectReturn(const char msg[]) { 66 if (msg) { 67 SkDebugf("--- %s\n", msg); 68 } 69 return NULL; 70 } 71
