You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
147 lines
3.7 KiB
147 lines
3.7 KiB
/*
|
|
* Copyright (C) 2018 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.
|
|
*/
|
|
|
|
//#define LOG_NDEBUG 0
|
|
#define LOG_TAG "FileSource"
|
|
#include <utils/Log.h>
|
|
|
|
#include <datasource/FileSource.h>
|
|
#include <media/stagefright/foundation/ADebug.h>
|
|
#include <media/stagefright/FoundationUtils.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
namespace android {
|
|
|
|
FileSource::FileSource(const char *filename)
|
|
: mFd(-1),
|
|
mOffset(0),
|
|
mLength(-1),
|
|
mName("<null>") {
|
|
|
|
if (filename) {
|
|
mName = String8::format("FileSource(%s)", filename);
|
|
}
|
|
ALOGV("%s", filename);
|
|
mFd = open(filename, O_LARGEFILE | O_RDONLY);
|
|
|
|
if (mFd >= 0) {
|
|
mLength = lseek64(mFd, 0, SEEK_END);
|
|
} else {
|
|
ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
|
|
}
|
|
}
|
|
|
|
FileSource::FileSource(int fd, int64_t offset, int64_t length)
|
|
: mFd(fd),
|
|
mOffset(offset),
|
|
mLength(length),
|
|
mName("<null>") {
|
|
ALOGV("fd=%d (%s), offset=%lld, length=%lld",
|
|
fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
|
|
|
|
if (mOffset < 0) {
|
|
mOffset = 0;
|
|
}
|
|
if (mLength < 0) {
|
|
mLength = 0;
|
|
}
|
|
if (mLength > INT64_MAX - mOffset) {
|
|
mLength = INT64_MAX - mOffset;
|
|
}
|
|
struct stat s;
|
|
if (fstat(fd, &s) == 0) {
|
|
if (mOffset > s.st_size) {
|
|
mOffset = s.st_size;
|
|
mLength = 0;
|
|
}
|
|
if (mOffset + mLength > s.st_size) {
|
|
mLength = s.st_size - mOffset;
|
|
}
|
|
}
|
|
if (mOffset != offset || mLength != length) {
|
|
ALOGW("offset/length adjusted from %lld/%lld to %lld/%lld",
|
|
(long long) offset, (long long) length,
|
|
(long long) mOffset, (long long) mLength);
|
|
}
|
|
|
|
mName = String8::format(
|
|
"FileSource(fd(%s), %lld, %lld)",
|
|
nameForFd(fd).c_str(),
|
|
(long long) mOffset,
|
|
(long long) mLength);
|
|
|
|
}
|
|
|
|
FileSource::~FileSource() {
|
|
if (mFd >= 0) {
|
|
::close(mFd);
|
|
mFd = -1;
|
|
}
|
|
}
|
|
|
|
status_t FileSource::initCheck() const {
|
|
return mFd >= 0 ? OK : NO_INIT;
|
|
}
|
|
|
|
ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
|
|
if (mFd < 0) {
|
|
return NO_INIT;
|
|
}
|
|
|
|
Mutex::Autolock autoLock(mLock);
|
|
if (mLength >= 0) {
|
|
if (offset < 0) {
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
if (offset >= mLength) {
|
|
return 0; // read beyond EOF.
|
|
}
|
|
uint64_t numAvailable = mLength - offset;
|
|
if ((uint64_t)size > numAvailable) {
|
|
size = numAvailable;
|
|
}
|
|
}
|
|
return readAt_l(offset, data, size);
|
|
}
|
|
|
|
ssize_t FileSource::readAt_l(off64_t offset, void *data, size_t size) {
|
|
off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
|
|
if (result == -1) {
|
|
ALOGE("seek to %lld failed", (long long)(offset + mOffset));
|
|
return UNKNOWN_ERROR;
|
|
}
|
|
|
|
return ::read(mFd, data, size);
|
|
}
|
|
|
|
status_t FileSource::getSize(off64_t *size) {
|
|
Mutex::Autolock autoLock(mLock);
|
|
|
|
if (mFd < 0) {
|
|
return NO_INIT;
|
|
}
|
|
|
|
*size = mLength;
|
|
|
|
return OK;
|
|
}
|
|
|
|
} // namespace android
|