283 lines
8.8 KiB
C
283 lines
8.8 KiB
C
/***********************************************************************
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*
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* Copyright (C) 2006 Novell, Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, Novell, Inc.
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*
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* To contact Novell about this file by physical or electronic mail,
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* you may find current contact information at www.novell.com.
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*
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* Author: Juan Carlos Luciani <jluciani@novell.com>
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*
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***********************************************************************/
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//===[ Include files ]=====================================================
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#include "internal.h"
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//===[ Type definitions ]==================================================
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//===[ Function prototypes ]===============================================
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//===[ Global variables ]==================================================
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// Debug Level
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int DebugLevel = 0;
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// Tables for Base64 encoding and decoding
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static const int8_t g_Base64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static const uint8_t g_Expand64[256] =
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{
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/* ASCII table */
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
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64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
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64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
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};
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//++=======================================================================
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CasaStatus
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EncodeData(
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IN const void *pData,
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IN const int32_t dataLen,
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INOUT char **ppEncodedData,
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INOUT int32_t *pEncodedDataLen)
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//
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// Arguments:
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//
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// Returns:
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//
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// Description:
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//
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// L2
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//=======================================================================--
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{
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CasaStatus retStatus;
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int encodedSize;
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char *pTmp;
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DbgTrace(3, "-EncodeData- Start\n", 0);
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// Determine the encoded size and allocate a buffer to hold the encoded data
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encodedSize = ((dataLen * 4 + 2) / 3) - (dataLen % 3 ) + 4;
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pTmp = (char*) malloc(encodedSize);
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*ppEncodedData = pTmp;
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if (*ppEncodedData)
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{
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uint8_t *pOut, *pIn;
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int i;
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// Setup pointers to move through the buffers
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pIn = (uint8_t*) pData;
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pOut = (uint8_t*) *ppEncodedData;
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// Perform the encoding
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for (i = 0; i < dataLen - 2; i += 3)
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{
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*pOut++ = g_Base64[(pIn[i] >> 2) & 0x3F];
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*pOut++ = g_Base64[((pIn[i] & 0x3) << 4) |
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((int32_t)(pIn[i + 1] & 0xF0) >> 4)];
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*pOut++ = g_Base64[((pIn[i + 1] & 0xF) << 2) |
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((int32_t)(pIn[i + 2] & 0xC0) >> 6)];
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*pOut++ = g_Base64[pIn[i + 2] & 0x3F];
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}
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if (i < dataLen)
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{
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*pOut++ = g_Base64[(pIn[i] >> 2) & 0x3F];
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if (i == (dataLen - 1))
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{
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*pOut++ = g_Base64[((pIn[i] & 0x3) << 4)];
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*pOut++ = '=';
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}
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else
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{
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*pOut++ = g_Base64[((pIn[i] & 0x3) << 4) |
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((int32_t)(pIn[i + 1] & 0xF0) >> 4)];
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*pOut++ = g_Base64[((pIn[i + 1] & 0xF) << 2)];
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}
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*pOut++ = '=';
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}
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*pOut++ = '\0';
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// Return the encoded data length
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*pEncodedDataLen = (int32_t)(pOut - (uint8_t*)*ppEncodedData);
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// Success
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retStatus = CASA_STATUS_SUCCESS;
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}
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else
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{
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DbgTrace(0, "-EncodeData- Buffer allocation failure\n", 0);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_PWTOKEN,
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CASA_STATUS_INSUFFICIENT_RESOURCES);
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}
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DbgTrace(3, "-EncodeData- End, retStatus = %08X\n", retStatus);
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return retStatus;
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}
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//++=======================================================================
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CasaStatus
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DecodeData(
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IN const char *pEncodedData,
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IN const int32_t encodedDataLen, // Does not include NULL terminator
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INOUT void **ppData,
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INOUT int32_t *pDataLen)
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//
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// Arguments:
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//
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// Returns:
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//
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// Description:
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//
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// L2
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//=======================================================================--
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{
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CasaStatus retStatus;
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int i, j;
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int decodedSize;
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DbgTrace(3, "-DecodeData- Start\n", 0);
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// Determine the decoded size
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for (i = 0, j = 0; i < encodedDataLen; i++)
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if (g_Expand64[((uint8_t*) pEncodedData)[i]] < 64)
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j++;
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decodedSize = (j * 3 + 3) / 4;
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// Allocate buffer to hold the decoded data
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*ppData = malloc(decodedSize);
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if (*ppData)
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{
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bool endReached = false;
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uint8_t c0, c1, c2, c3;
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uint8_t *p, *q;
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// Initialize parameters that will be used during the decode operation
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c0 = c1 = c2 = c3 = 0;
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p = (uint8_t*) pEncodedData;
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q = (uint8_t*) *ppData;
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// Decode the data
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//
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// Loop through the data, piecing back information. Any newlines, and/or
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// carriage returns need to be skipped.
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while (j > 4)
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{
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while ((64 == g_Expand64[*p]) && (('\n' == *p) || ('\r' == *p)))
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p++;
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if (64 == g_Expand64[*p])
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{
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endReached = true;
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break;
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}
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c0 = *(p++);
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while ((64 == g_Expand64[*p]) && (('\n' == *p) || ('\r' == *p)))
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p++;
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if (64 == g_Expand64[*p])
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{
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*(q++) = (uint8_t)(g_Expand64[c0] << 2);
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j--;
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endReached = true;
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break;
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}
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c1 = *(p++);
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while ((64 == g_Expand64[*p]) && (('\n' == *p) || ('\r' == *p)))
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p++;
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if (64 == g_Expand64[*p])
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{
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*(q++) = (uint8_t)(g_Expand64[c0] << 2 | g_Expand64[c1] >> 4);
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*(q++) = (uint8_t)(g_Expand64[c1] << 4);
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j -= 2;
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endReached = true;
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break;
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}
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c2 = *(p++);
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while ((64 == g_Expand64[*p]) && (('\n' == *p) || ('\r' == *p)))
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p++;
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if (64 == g_Expand64[*p])
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{
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*(q++) = (uint8_t)(g_Expand64[c0] << 2 | g_Expand64[c1] >> 4);
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*(q++) = (uint8_t)(g_Expand64[c1] << 4 | g_Expand64[c2] >> 2);
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*(q++) = (uint8_t)(g_Expand64[c2] << 6);
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j -= 3;
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endReached = true;
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break;
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}
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c3 = *(p++);
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*(q++) = (uint8_t)(g_Expand64[c0] << 2 | g_Expand64[c1] >> 4);
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*(q++) = (uint8_t)(g_Expand64[c1] << 4 | g_Expand64[c2] >> 2);
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*(q++) = (uint8_t)(g_Expand64[c2] << 6 | g_Expand64[c3]);
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j -= 4;
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}
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if (!endReached)
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{
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if (j > 1)
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*(q++) = (uint8_t)(g_Expand64[*p] << 2 | g_Expand64[p[1]] >> 4);
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if (j > 2)
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*(q++) = (uint8_t)(g_Expand64[p[1]] << 4 | g_Expand64[p[2]] >> 2);
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if (j > 3)
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*(q++) = (uint8_t)(g_Expand64[p[2]] << 6 | g_Expand64[p[3]]);
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}
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// Return the length of the decoded data
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*pDataLen = (int32_t)(q - (uint8_t*)*ppData);
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// Success
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retStatus = CASA_STATUS_SUCCESS;
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}
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else
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{
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DbgTrace(0, "-DecodeData- Buffer allocation failure\n", 0);
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retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
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CASA_FACILITY_PWTOKEN,
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CASA_STATUS_INSUFFICIENT_RESOURCES);
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}
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DbgTrace(3, "-DecodeData- End, retStatus = %08X\n", retStatus);
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return retStatus;
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}
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//++=======================================================================
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//++=======================================================================
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//++=======================================================================
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