Dongwon Kang | 1e1bcaa | 2018-08-01 12:44:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 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 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "ClearFileSource" |
| 19 | #include <utils/Log.h> |
| 20 | |
Marco Nelissen | 42057ce | 2019-09-23 12:15:57 -0700 | [diff] [blame^] | 21 | #include <datasource/ClearFileSource.h> |
Dongwon Kang | 1e1bcaa | 2018-08-01 12:44:46 -0700 | [diff] [blame] | 22 | #include <media/stagefright/foundation/ADebug.h> |
Marco Nelissen | 42057ce | 2019-09-23 12:15:57 -0700 | [diff] [blame^] | 23 | #include <media/stagefright/FoundationUtils.h> |
Dongwon Kang | 1e1bcaa | 2018-08-01 12:44:46 -0700 | [diff] [blame] | 24 | #include <sys/types.h> |
| 25 | #include <unistd.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <sys/stat.h> |
| 28 | #include <fcntl.h> |
| 29 | |
| 30 | namespace android { |
| 31 | |
| 32 | ClearFileSource::ClearFileSource(const char *filename) |
| 33 | : mFd(-1), |
| 34 | mOffset(0), |
| 35 | mLength(-1), |
| 36 | mName("<null>") { |
| 37 | |
| 38 | if (filename) { |
| 39 | mName = String8::format("FileSource(%s)", filename); |
| 40 | } |
| 41 | ALOGV("%s", filename); |
| 42 | mFd = open(filename, O_LARGEFILE | O_RDONLY); |
| 43 | |
| 44 | if (mFd >= 0) { |
| 45 | mLength = lseek64(mFd, 0, SEEK_END); |
| 46 | } else { |
| 47 | ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno)); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | ClearFileSource::ClearFileSource(int fd, int64_t offset, int64_t length) |
| 52 | : mFd(fd), |
| 53 | mOffset(offset), |
| 54 | mLength(length), |
| 55 | mName("<null>") { |
| 56 | ALOGV("fd=%d (%s), offset=%lld, length=%lld", |
| 57 | fd, nameForFd(fd).c_str(), (long long) offset, (long long) length); |
| 58 | |
| 59 | if (mOffset < 0) { |
| 60 | mOffset = 0; |
| 61 | } |
| 62 | if (mLength < 0) { |
| 63 | mLength = 0; |
| 64 | } |
| 65 | if (mLength > INT64_MAX - mOffset) { |
| 66 | mLength = INT64_MAX - mOffset; |
| 67 | } |
| 68 | struct stat s; |
| 69 | if (fstat(fd, &s) == 0) { |
| 70 | if (mOffset > s.st_size) { |
| 71 | mOffset = s.st_size; |
| 72 | mLength = 0; |
| 73 | } |
| 74 | if (mOffset + mLength > s.st_size) { |
| 75 | mLength = s.st_size - mOffset; |
| 76 | } |
| 77 | } |
| 78 | if (mOffset != offset || mLength != length) { |
| 79 | ALOGW("offset/length adjusted from %lld/%lld to %lld/%lld", |
| 80 | (long long) offset, (long long) length, |
| 81 | (long long) mOffset, (long long) mLength); |
| 82 | } |
| 83 | |
| 84 | mName = String8::format( |
| 85 | "FileSource(fd(%s), %lld, %lld)", |
| 86 | nameForFd(fd).c_str(), |
| 87 | (long long) mOffset, |
| 88 | (long long) mLength); |
| 89 | |
| 90 | } |
| 91 | |
| 92 | ClearFileSource::~ClearFileSource() { |
| 93 | if (mFd >= 0) { |
| 94 | ::close(mFd); |
| 95 | mFd = -1; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | status_t ClearFileSource::initCheck() const { |
| 100 | return mFd >= 0 ? OK : NO_INIT; |
| 101 | } |
| 102 | |
| 103 | ssize_t ClearFileSource::readAt(off64_t offset, void *data, size_t size) { |
| 104 | if (mFd < 0) { |
| 105 | return NO_INIT; |
| 106 | } |
| 107 | |
| 108 | Mutex::Autolock autoLock(mLock); |
| 109 | if (mLength >= 0) { |
| 110 | if (offset >= mLength) { |
| 111 | return 0; // read beyond EOF. |
| 112 | } |
| 113 | uint64_t numAvailable = mLength - offset; |
| 114 | if ((uint64_t)size > numAvailable) { |
| 115 | size = numAvailable; |
| 116 | } |
| 117 | } |
| 118 | return readAt_l(offset, data, size); |
| 119 | } |
| 120 | |
| 121 | ssize_t ClearFileSource::readAt_l(off64_t offset, void *data, size_t size) { |
| 122 | off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET); |
| 123 | if (result == -1) { |
| 124 | ALOGE("seek to %lld failed", (long long)(offset + mOffset)); |
| 125 | return UNKNOWN_ERROR; |
| 126 | } |
| 127 | |
| 128 | return ::read(mFd, data, size); |
| 129 | } |
| 130 | |
| 131 | status_t ClearFileSource::getSize(off64_t *size) { |
| 132 | Mutex::Autolock autoLock(mLock); |
| 133 | |
| 134 | if (mFd < 0) { |
| 135 | return NO_INIT; |
| 136 | } |
| 137 | |
| 138 | *size = mLength; |
| 139 | |
| 140 | return OK; |
| 141 | } |
| 142 | |
| 143 | } // namespace android |