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/*
* Copyright (C) 2017 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 "DescramblerImpl"
#include <media/cas/DescramblerAPI.h>
#include <media/DescramblerImpl.h>
#include <media/SharedLibrary.h>
#include <media/stagefright/foundation/AUtils.h>
#include <binder/IMemory.h>
#include <utils/Log.h>
namespace android {
static Status getBinderStatus(status_t err) {
if (err == OK) {
return Status::ok();
}
if (err == BAD_VALUE) {
return Status::fromExceptionCode(Status::EX_ILLEGAL_ARGUMENT);
}
if (err == INVALID_OPERATION) {
return Status::fromExceptionCode(Status::EX_ILLEGAL_STATE);
}
return Status::fromServiceSpecificError(err);
}
static String8 sessionIdToString(const CasSessionId &sessionId) {
String8 result;
for (size_t i = 0; i < sessionId.size(); i++) {
result.appendFormat("%02x ", sessionId[i]);
}
if (result.isEmpty()) {
result.append("(null)");
}
return result;
}
DescramblerImpl::DescramblerImpl(
const sp<SharedLibrary>& library, DescramblerPlugin *plugin) :
mLibrary(library), mPlugin(plugin) {
ALOGV("CTOR: mPlugin=%p", mPlugin);
}
DescramblerImpl::~DescramblerImpl() {
ALOGV("DTOR: mPlugin=%p", mPlugin);
release();
}
Status DescramblerImpl::setMediaCasSession(const CasSessionId& sessionId) {
ALOGV("setMediaCasSession: sessionId=%s",
sessionIdToString(sessionId).string());
return getBinderStatus(mPlugin->setMediaCasSession(sessionId));
}
Status DescramblerImpl::requiresSecureDecoderComponent(
const String16& mime, bool *result) {
*result = mPlugin->requiresSecureDecoderComponent(String8(mime));
return getBinderStatus(OK);
}
static inline bool validateRangeForSize(
uint64_t offset, uint64_t length, uint64_t size) {
return isInRange<uint64_t, uint64_t>(0, size, offset, length);
}
Status DescramblerImpl::descramble(
const DescrambleInfo& info, int32_t *result) {
ALOGV("descramble");
if (info.srcMem == NULL || info.srcMem->pointer() == NULL) {
ALOGE("srcMem is invalid");
return getBinderStatus(BAD_VALUE);
}
// use 64-bit here to catch bad subsample size that might be overflowing.
uint64_t totalBytesInSubSamples = 0;
for (size_t i = 0; i < info.numSubSamples; i++) {
totalBytesInSubSamples += (uint64_t)info.subSamples[i].mNumBytesOfClearData +
info.subSamples[i].mNumBytesOfEncryptedData;
}
// validate if the specified srcOffset and requested total subsample size
// is consistent with the source shared buffer size.
if (!validateRangeForSize(info.srcOffset, totalBytesInSubSamples, info.srcMem->size())) {
ALOGE("Invalid srcOffset and subsample size: "
"srcOffset %llu, totalBytesInSubSamples %llu, srcMem size %llu",
(unsigned long long) info.srcOffset,
(unsigned long long) totalBytesInSubSamples,
(unsigned long long) info.srcMem->size());
android_errorWriteLog(0x534e4554, "67962232");
return getBinderStatus(BAD_VALUE);
}
void *dstPtr = NULL;
if (info.dstType == DescrambleInfo::kDestinationTypeVmPointer) {
// When using shared memory, src buffer is also used as dst
dstPtr = info.srcMem->pointer();
// In this case the dst and src would be the same buffer, need to validate
// dstOffset against the buffer size too.
if (!validateRangeForSize(info.dstOffset, totalBytesInSubSamples, info.srcMem->size())) {
ALOGE("Invalid dstOffset and subsample size: "
"dstOffset %llu, totalBytesInSubSamples %llu, srcBuffer size %llu",
(unsigned long long) info.dstOffset,
(unsigned long long) totalBytesInSubSamples,
(unsigned long long) info.srcMem->size());
android_errorWriteLog(0x534e4554, "67962232");
return getBinderStatus(BAD_VALUE);
}
} else {
dstPtr = info.dstPtr;
}
*result = mPlugin->descramble(
info.dstType != DescrambleInfo::kDestinationTypeVmPointer,
info.scramblingControl,
info.numSubSamples,
info.subSamples,
info.srcMem->pointer(),
info.srcOffset,
dstPtr,
info.dstOffset,
NULL);
return getBinderStatus(*result >= 0 ? OK : *result);
}
Status DescramblerImpl::release() {
ALOGV("release: mPlugin=%p", mPlugin);
if (mPlugin != NULL) {
delete mPlugin;
mPlugin = NULL;
}
return Status::ok();
}
} // namespace android
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