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/*
* 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