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139 lines
3.5 KiB
139 lines
3.5 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "MidiIoWrapper"
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#include <utils/Log.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <media/MidiIoWrapper.h>
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#include <media/MediaExtractorPluginApi.h>
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static int readAt(void *handle, void *buffer, int pos, int size) {
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return ((android::MidiIoWrapper*)handle)->readAt(buffer, pos, size);
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}
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static int size(void *handle) {
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return ((android::MidiIoWrapper*)handle)->size();
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}
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namespace android {
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MidiIoWrapper::MidiIoWrapper(const char *path) {
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ALOGV("MidiIoWrapper(%s)", path);
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mFd = open(path, O_RDONLY | O_LARGEFILE);
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mBase = 0;
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mLength = lseek(mFd, 0, SEEK_END);
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mDataSource = nullptr;
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}
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MidiIoWrapper::MidiIoWrapper(int fd, off64_t offset, int64_t size) {
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ALOGV("MidiIoWrapper(fd=%d)", fd);
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mFd = fd < 0 ? -1 : dup(fd);
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mBase = offset;
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mLength = size;
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mDataSource = nullptr;
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}
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class MidiIoWrapper::DataSourceUnwrapper {
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public:
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explicit DataSourceUnwrapper(CDataSource *csource) {
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mSource = csource;
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}
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virtual ~DataSourceUnwrapper() {}
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virtual status_t initCheck() const { return OK; }
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// Returns the number of bytes read, or -1 on failure. It's not an error if
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// this returns zero; it just means the given offset is equal to, or
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// beyond, the end of the source.
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virtual ssize_t readAt(off64_t offset, void *data, size_t size) {
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return mSource->readAt(mSource->handle, offset, data, size);
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}
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// May return ERROR_UNSUPPORTED.
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virtual status_t getSize(off64_t *size) {
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return mSource->getSize(mSource->handle, size);
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}
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virtual bool getUri(char * /*uriString*/, size_t /*bufferSize*/) {
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return false;
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}
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virtual uint32_t flags() {
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return 0;
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}
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virtual void close() {};
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private:
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CDataSource *mSource;
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};
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MidiIoWrapper::MidiIoWrapper(CDataSource *csource) {
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ALOGV("MidiIoWrapper(CDataSource)");
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mFd = -1;
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mBase = 0;
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mDataSource = new DataSourceUnwrapper(csource);
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off64_t l;
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if (mDataSource->getSize(&l) == OK) {
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mLength = l;
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} else {
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mLength = 0;
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}
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}
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MidiIoWrapper::~MidiIoWrapper() {
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ALOGV("~MidiIoWrapper");
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if (mFd >= 0) {
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close(mFd);
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}
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delete mDataSource;
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}
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int MidiIoWrapper::readAt(void *buffer, int offset, int size) {
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ALOGV("readAt(%p, %d, %d)", buffer, offset, size);
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if (mDataSource != NULL) {
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return mDataSource->readAt(offset, buffer, size);
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}
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if (mFd < 0) {
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errno = EBADF;
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return -1; // as per failed read.
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}
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lseek(mFd, mBase + offset, SEEK_SET);
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if (offset + size > mLength) {
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size = mLength - offset;
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}
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return read(mFd, buffer, size);
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}
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int MidiIoWrapper::size() {
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ALOGV("size() = %d", int(mLength));
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return mLength;
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}
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EAS_FILE_LOCATOR MidiIoWrapper::getLocator() {
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mEasFile.handle = this;
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mEasFile.readAt = ::readAt;
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mEasFile.size = ::size;
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return &mEasFile;
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}
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} // namespace android
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