19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <objmng/drm_decoder.h> 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* global variables */ 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectstatic const uint8_t * base64_alphabet = (const uint8_t *)"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#define SKIP_CRLF(p) while('\r' == *(p) || '\n' == *(p)) \ 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project p++ 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectstatic int8_t get_alphabet_index(int8_t ch) 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project uint8_t * tmp; 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ('=' == ch) 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 64; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project tmp = (uint8_t *)strchr((const char *)base64_alphabet, ch); 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (NULL == tmp) 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int8_t)(tmp - base64_alphabet); 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* See drm_decoder.h */ 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectint32_t drm_decodeBase64(uint8_t * dest, int32_t destLen, uint8_t * src, int32_t * srcLen) 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int32_t maxDestSize, i, maxGroup; 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project uint8_t *pDest, *pSrc; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int8_t tpChar; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (NULL == src || NULL == srcLen || *srcLen <= 0 || destLen < 0) 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project maxDestSize = (*srcLen) * 3/4; 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (NULL == dest || 0 == destLen) 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return maxDestSize; 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (destLen < maxDestSize) 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project maxDestSize = destLen; 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project maxGroup = maxDestSize/3; 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest = dest; /* start to decode src to dest */ 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pSrc = src; 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (i = 0; i < maxGroup && *srcLen - (pSrc - src) >= 4; i++) { 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SKIP_CRLF(pSrc); 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (pSrc - src >= *srcLen) 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project tpChar = get_alphabet_index(*pSrc); /* to first byte */ 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (-1 == tpChar || 64 == tpChar) 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest[0] = tpChar << 2; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pSrc++; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SKIP_CRLF(pSrc); 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project tpChar = get_alphabet_index(*pSrc); 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (-1 == tpChar || 64 == tpChar) 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest[0] |= (tpChar >> 4); 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest[1] = tpChar << 4; /* to second byte */ 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pSrc++; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SKIP_CRLF(pSrc); 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project tpChar = get_alphabet_index(*pSrc); 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (-1 == tpChar) 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (64 == tpChar) /* end */ 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return pDest - dest + 1; 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest[1] |= (tpChar >> 2); 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest[2] = tpChar << 6; /* to third byte */ 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pSrc++; 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SKIP_CRLF(pSrc); 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project tpChar = get_alphabet_index(*pSrc); 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (-1 == tpChar) 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (64 == tpChar) /* end */ 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return pDest - dest + 2; 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest[2] |= tpChar; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pDest += 3; 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pSrc++; 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project *srcLen = pSrc - src; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return pDest - dest; 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 97