1 /* 2 * Copyright (C) 2009 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 <media/stagefright/FileSource.h> 18 #include <media/stagefright/MediaDebug.h> 19 20 namespace android { 21 22 FileSource::FileSource(const char *filename) 23 : mFile(fopen(filename, "rb")), 24 mOffset(0), 25 mLength(-1) { 26 } 27 28 FileSource::FileSource(int fd, int64_t offset, int64_t length) 29 : mFile(fdopen(fd, "rb")), 30 mOffset(offset), 31 mLength(length) { 32 CHECK(offset >= 0); 33 CHECK(length >= 0); 34 } 35 36 FileSource::~FileSource() { 37 if (mFile != NULL) { 38 fclose(mFile); 39 mFile = NULL; 40 } 41 } 42 43 status_t FileSource::initCheck() const { 44 return mFile != NULL ? OK : NO_INIT; 45 } 46 47 ssize_t FileSource::readAt(off_t offset, void *data, size_t size) { 48 if (mFile == NULL) { 49 return NO_INIT; 50 } 51 52 Mutex::Autolock autoLock(mLock); 53 54 if (mLength >= 0) { 55 if (offset >= mLength) { 56 return 0; // read beyond EOF. 57 } 58 int64_t numAvailable = mLength - offset; 59 if ((int64_t)size > numAvailable) { 60 size = numAvailable; 61 } 62 } 63 64 int err = fseeko(mFile, offset + mOffset, SEEK_SET); 65 if (err < 0) { 66 LOGE("seek to %lld failed", offset + mOffset); 67 return UNKNOWN_ERROR; 68 } 69 70 return fread(data, 1, size, mFile); 71 } 72 73 status_t FileSource::getSize(off_t *size) { 74 if (mFile == NULL) { 75 return NO_INIT; 76 } 77 78 if (mLength >= 0) { 79 *size = mLength; 80 81 return OK; 82 } 83 84 fseek(mFile, 0, SEEK_END); 85 *size = ftello(mFile); 86 87 return OK; 88 } 89 90 } // namespace android 91
