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annotate nspr/lib/libc/include/plbase64.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef _plbase64_h
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7 #define _plbase64_h
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8
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9 #include "prtypes.h"
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10
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11 PR_BEGIN_EXTERN_C
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12
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13 /*
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14 * PL_Base64Encode
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15 *
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16 * This routine encodes the data pointed to by the "src" parameter using the
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17 * base64 algorithm, and returns a pointer to the result. If the "srclen"
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18 * parameter is not zero, it specifies the length of the source data. If it
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19 * is zero, the source data is assumed to be null-terminated, and PL_strlen
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20 * is used to determine the source length. If the "dest" parameter is not
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21 * null, it is assumed to point to a buffer of sufficient size (which may be
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22 * calculated: ((srclen + 2)/3)*4) into which the encoded data is placed
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23 * (without any termination). If the "dest" parameter is null, a buffer is
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24 * allocated from the heap to hold the encoded data, and the result *will*
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25 * be terminated with an extra null character. It is the caller's
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26 * responsibility to free the result when it is allocated. A null is returned
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27 * if the allocation fails.
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28 *
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29 * NOTE: when calculating ((srclen + 2)/3)*4), first ensure that
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30 * srclen <= (PR_UINT32_MAX/4) * 3
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31 * to avoid PRUint32 overflow.
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32 */
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33
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34 PR_EXTERN(char *)
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35 PL_Base64Encode
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36 (
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37 const char *src,
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38 PRUint32 srclen,
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39 char *dest
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40 );
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41
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42 /*
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43 * PL_Base64Decode
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44 *
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45 * This routine decodes the data pointed to by the "src" parameter using
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46 * the base64 algorithm, and returns a pointer to the result. The source
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47 * may either include or exclude any trailing '=' characters. If the
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48 * "srclen" parameter is not zero, it specifies the length of the source
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49 * data. If it is zero, PL_strlen will be used to determine the source
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50 * length. If the "dest" parameter is not null, it is assumed to point to
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51 * a buffer of sufficient size (which may be calculated: (srclen * 3)/4
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52 * when srclen includes the '=' characters) into which the decoded data
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53 * is placed (without any termination). If the "dest" parameter is null,
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54 * a buffer is allocated from the heap to hold the decoded data, and the
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55 * result *will* be terminated with an extra null character. It is the
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56 * caller's responsibility to free the result when it is allocated. A null
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57 * is retuned if the allocation fails, or if the source is not well-coded.
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58 *
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59 * NOTE: when calculating (srclen * 3)/4, first ensure that
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60 * srclen <= PR_UINT32_MAX/3
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61 * to avoid PRUint32 overflow. Alternatively, calculate
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62 * (srclen/4) * 3 + ((srclen%4) * 3)/4
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63 * which is equivalent but doesn't overflow for any value of srclen.
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64 */
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65
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66 PR_EXTERN(char *)
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67 PL_Base64Decode
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68 (
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69 const char *src,
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70 PRUint32 srclen,
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71 char *dest
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72 );
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73
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74 PR_END_EXTERN_C
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75
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76 #endif /* _plbase64_h */
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