1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef __DRM_ISTREAM_H__ 18 #define __DRM_ISTREAM_H__ 19 20 #include <Drm2CommonTypes.h> 21 #include <util/crypto/DrmCrypto.h> 22 #include <dcf/DrmDcfContainer.h> 23 #include <ustring.h> 24 25 using namespace ustl; 26 27 class DcfContainer; 28 29 class DrmInStream 30 { 31 public: 32 /** default constructor of DrmInStream */ 33 DrmInStream():mDecryptPos(0){} 34 35 /** 36 * constructor for DrmInStream, used to read DCF content 37 * \param encFile DCF container data 38 * \param len DCF container data len 39 * \param off the offset from the start of DCF container 40 */ 41 DrmInStream(const DcfContainer* container,uint8_t* Key); 42 43 /** 44 * get the size of DRM Instream 45 * \param none 46 * \return 47 * the size of DRM Instream 48 */ 49 uint64_t size() const; 50 51 /** 52 * read data from DRM Instream 53 * \param data the buffer to store read data 54 * \param len how much data need to read 55 * \return 56 * the actual len of read data 57 */ 58 uint64_t read(uint8_t* data,uint64_t len); 59 60 PRIVATE: 61 static const uint32_t AES_IV_LEN = 16; 62 static const uint32_t AES_KEY_LEN = 16; 63 static const uint32_t AES_BLOCK_LEN = 16; 64 65 const DcfContainer* mDcfCon; 66 uint64_t mDecryptPos; 67 uint8_t mAesKey[AES_KEY_LEN]; 68 }; 69 70 71 72 #endif 73 74 75 76 77 78
