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/*
* Copyright (C) 2009 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.
*/
#include <media/stagefright/FileSource.h>
#include <media/stagefright/MediaDebug.h>
namespace android {
FileSource::FileSource(const char *filename)
: mFile(fopen(filename, "rb")),
mOffset(0),
mLength(-1) {
}
FileSource::FileSource(int fd, int64_t offset, int64_t length)
: mFile(fdopen(fd, "rb")),
mOffset(offset),
mLength(length) {
CHECK(offset >= 0);
CHECK(length >= 0);
}
FileSource::~FileSource() {
if (mFile != NULL) {
fclose(mFile);
mFile = NULL;
}
}
status_t FileSource::initCheck() const {
return mFile != NULL ? OK : NO_INIT;
}
ssize_t FileSource::readAt(off_t offset, void *data, size_t size) {
if (mFile == NULL) {
return NO_INIT;
}
Mutex::Autolock autoLock(mLock);
if (mLength >= 0) {
if (offset >= mLength) {
return 0; // read beyond EOF.
}
int64_t numAvailable = mLength - offset;
if ((int64_t)size > numAvailable) {
size = numAvailable;
}
}
int err = fseeko(mFile, offset + mOffset, SEEK_SET);
if (err < 0) {
LOGE("seek to %lld failed", offset + mOffset);
return UNKNOWN_ERROR;
}
return fread(data, 1, size, mFile);
}
status_t FileSource::getSize(off_t *size) {
if (mFile == NULL) {
return NO_INIT;
}
if (mLength >= 0) {
*size = mLength;
return OK;
}
fseek(mFile, 0, SEEK_END);
*size = ftello(mFile);
return OK;
}
} // namespace android
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