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/*
* Copyright (C) 2014 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 <datasource/DataURISource.h>
#include <media/stagefright/foundation/ABuffer.h>
#include <media/stagefright/foundation/AString.h>
#include <media/stagefright/foundation/base64.h>
namespace android {
// static
sp<DataURISource> DataURISource::Create(const char *uri) {
if (strncasecmp("data:", uri, 5)) {
return NULL;
}
const char *commaPos = strrchr(uri, ',');
if (commaPos == NULL) {
return NULL;
}
sp<ABuffer> buffer;
AString tmp(&uri[5], commaPos - &uri[5]);
if (tmp.endsWith(";base64")) {
// strip all CR and LF characters.
const char *src = commaPos+1;
int len = strlen(src) + 1;
char *cleansed = (char *) malloc(len);
if (cleansed == NULL) return NULL;
char *keeping = cleansed;
int left = len;
for (int i = 0; i < len ; i++)
{
const char c = *src++;
if (c == '\r' || c == '\n') {
continue;
}
*keeping++ = c;
left--;
}
memset(keeping, 0, left);
AString encoded(cleansed);
free(cleansed);
buffer = decodeBase64(encoded);
if (buffer == NULL) {
ALOGE("Malformed base64 encoded content found.");
return NULL;
}
} else {
#if 0
size_t dataLen = strlen(uri) - tmp.size() - 6;
buffer = new ABuffer(dataLen);
memcpy(buffer->data(), commaPos + 1, dataLen);
// unescape
#else
// MediaPlayer doesn't care for this right now as we don't
// play any text-based media.
return NULL;
#endif
}
// We don't really care about charset or mime type.
return new DataURISource(buffer);
}
DataURISource::DataURISource(const sp<ABuffer> &buffer)
: mBuffer(buffer) {
}
DataURISource::~DataURISource() {
}
status_t DataURISource::initCheck() const {
return OK;
}
ssize_t DataURISource::readAt(off64_t offset, void *data, size_t size) {
if ((offset < 0) || (offset >= (off64_t)mBuffer->size())) {
return 0;
}
size_t copy = mBuffer->size() - offset;
if (copy > size) {
copy = size;
}
memcpy(data, mBuffer->data() + offset, copy);
return copy;
}
status_t DataURISource::getSize(off64_t *size) {
*size = mBuffer->size();
return OK;
}
} // namespace android
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