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/*
* Copyright (C) 2010 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.
*/
#ifndef OBBFILE_H_
#define OBBFILE_H_
#include <stdint.h>
#include <strings.h>
#include <utils/RefBase.h>
#include <utils/String8.h>
namespace android {
// OBB flags (bit 0)
#define OBB_OVERLAY (1 << 0)
#define OBB_SALTED (1 << 1)
class ObbFile : public RefBase {
protected:
virtual ~ObbFile();
public:
ObbFile();
bool readFrom(const char* filename);
bool readFrom(int fd);
bool writeTo(const char* filename);
bool writeTo(int fd);
bool removeFrom(const char* filename);
bool removeFrom(int fd);
const char* getFileName() const {
return mFileName;
}
const String8 getPackageName() const {
return mPackageName;
}
void setPackageName(String8 packageName) {
mPackageName = packageName;
}
int32_t getVersion() const {
return mVersion;
}
void setVersion(int32_t version) {
mVersion = version;
}
int32_t getFlags() const {
return mFlags;
}
void setFlags(int32_t flags) {
mFlags = flags;
}
const unsigned char* getSalt(size_t* length) const {
if ((mFlags & OBB_SALTED) == 0) {
*length = 0;
return NULL;
}
*length = sizeof(mSalt);
return mSalt;
}
bool setSalt(const unsigned char* salt, size_t length) {
if (length != sizeof(mSalt)) {
return false;
}
memcpy(mSalt, salt, sizeof(mSalt));
mFlags |= OBB_SALTED;
return true;
}
bool isOverlay() {
return (mFlags & OBB_OVERLAY) == OBB_OVERLAY;
}
void setOverlay(bool overlay) {
if (overlay) {
mFlags |= OBB_OVERLAY;
} else {
mFlags &= ~OBB_OVERLAY;
}
}
static inline uint32_t get4LE(const unsigned char* buf) {
return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
}
static inline void put4LE(unsigned char* buf, uint32_t val) {
buf[0] = val & 0xFF;
buf[1] = (val >> 8) & 0xFF;
buf[2] = (val >> 16) & 0xFF;
buf[3] = (val >> 24) & 0xFF;
}
private:
/* Package name this ObbFile is associated with */
String8 mPackageName;
/* Package version this ObbFile is associated with */
int32_t mVersion;
/* Flags for this OBB type. */
int32_t mFlags;
/* Whether the file is salted. */
bool mSalted;
/* The encryption salt. */
unsigned char mSalt[8];
const char* mFileName;
size_t mFileSize;
size_t mFooterStart;
unsigned char* mReadBuf;
bool parseObbFile(int fd);
};
}
#endif /* OBBFILE_H_ */
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