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104 lines
3.6 KiB
C
Executable File
104 lines
3.6 KiB
C
Executable File
/** @file
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Copyright (C) 2016, The HermitCrabs Lab. All rights reserved.
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All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiLib.h>
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//
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// Base64 decoding algorithm implementation in C.
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// Courtesy of wikibooks, licensed under Creative Commons license:
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// https://creativecommons.org/licenses/by-sa/3.0/
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//
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// See: https://en.wikibooks.org/wiki/Algorithm_Implementation/Miscellaneous/Base64#C
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//
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// Additional modifications include permitting tabulation and other whitespace
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// characters to appear in the encoded data. The intention of those is to support
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// Base64 data from property lists.
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//
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#define WHITESPACE 64
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#define EQUALS 65
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#define INVALID 66
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STATIC CONST UINT8 D[] = {
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66,66,66,66,66,66,66,66,66,64,64,64,64,64,66,66,66,66,66,66,66,66,66,66,66,
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66,66,66,66,66,66,66,64,66,66,66,66,66,66,66,66,66,66,62,66,66,66,63,52,53,
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54,55,56,57,58,59,60,61,66,66,66,65,66,66,66, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,66,66,66,66,66,66,26,27,28,
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29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,66,66,
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66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
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66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
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66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
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66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
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66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,66,
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66,66,66,66,66,66
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};
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RETURN_STATUS
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EFIAPI
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OcBase64Decode (
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IN CONST CHAR8 *EncodedData,
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IN UINTN EncodedLength,
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OUT UINT8 *DecodedData,
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IN OUT UINTN *DecodedLength
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)
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{
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CONST CHAR8 *End = EncodedData + EncodedLength;
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CHAR8 Iter = 0;
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UINT32 Buf = 0;
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UINTN Len = 0;
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while (EncodedData < End) {
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UINT8 C = D[(UINT8)(*EncodedData++)];
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switch (C) {
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case WHITESPACE:
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continue; /* skip whitespace */
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case INVALID:
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return RETURN_INVALID_PARAMETER; /* invalid input, return error */
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case EQUALS: /* pad character, end of data */
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EncodedData = End;
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continue;
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default:
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Buf = Buf << 6U | C;
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Iter++; /* increment the number of iteration */
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/* If the buffer is full, split it into bytes */
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if (Iter == 4) {
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if ((Len += 3) > *DecodedLength) return RETURN_BUFFER_TOO_SMALL; /* buffer overflow */
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*(DecodedData++) = (Buf >> 16U) & 255U;
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*(DecodedData++) = (Buf >> 8U) & 255U;
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*(DecodedData++) = Buf & 255U;
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Buf = 0; Iter = 0;
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}
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}
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}
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if (Iter == 3) {
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if ((Len += 2) > *DecodedLength) return RETURN_BUFFER_TOO_SMALL; /* buffer overflow */
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*(DecodedData++) = (Buf >> 10U) & 255U;
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*(DecodedData++) = (Buf >> 2U) & 255U;
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} else if (Iter == 2) {
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if (++Len > *DecodedLength) return RETURN_BUFFER_TOO_SMALL; /* buffer overflow */
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*(DecodedData++) = (Buf >> 4U) & 255U;
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}
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*DecodedLength = Len; /* modify to reflect the actual output size */
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return EFI_SUCCESS;
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}
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