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