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77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _plbase64_h
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#define _plbase64_h
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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/*
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* PL_Base64Encode
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*
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* This routine encodes the data pointed to by the "src" parameter using the
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* base64 algorithm, and returns a pointer to the result. If the "srclen"
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* parameter is not zero, it specifies the length of the source data. If it
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* is zero, the source data is assumed to be null-terminated, and PL_strlen
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* is used to determine the source length. If the "dest" parameter is not
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* null, it is assumed to point to a buffer of sufficient size (which may be
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* calculated: ((srclen + 2)/3)*4) into which the encoded data is placed
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* (without any termination). If the "dest" parameter is null, a buffer is
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* allocated from the heap to hold the encoded data, and the result *will*
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* be terminated with an extra null character. It is the caller's
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* responsibility to free the result when it is allocated. A null is returned
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* if the allocation fails.
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*
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* NOTE: when calculating ((srclen + 2)/3)*4), first ensure that
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* srclen <= (PR_UINT32_MAX/4) * 3
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* to avoid PRUint32 overflow.
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*/
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PR_EXTERN(char *)
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PL_Base64Encode
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(
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const char *src,
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PRUint32 srclen,
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char *dest
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);
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/*
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* PL_Base64Decode
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*
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* This routine decodes the data pointed to by the "src" parameter using
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* the base64 algorithm, and returns a pointer to the result. The source
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* may either include or exclude any trailing '=' characters. If the
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* "srclen" parameter is not zero, it specifies the length of the source
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* data. If it is zero, PL_strlen will be used to determine the source
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* length. If the "dest" parameter is not null, it is assumed to point to
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* a buffer of sufficient size (which may be calculated: (srclen * 3)/4
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* when srclen includes the '=' characters) into which the decoded data
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* is placed (without any termination). If the "dest" parameter is null,
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* a buffer is allocated from the heap to hold the decoded data, and the
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* result *will* be terminated with an extra null character. It is the
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* caller's responsibility to free the result when it is allocated. A null
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* is retuned if the allocation fails, or if the source is not well-coded.
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*
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* NOTE: when calculating (srclen * 3)/4, first ensure that
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* srclen <= PR_UINT32_MAX/3
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* to avoid PRUint32 overflow. Alternatively, calculate
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* (srclen/4) * 3 + ((srclen%4) * 3)/4
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* which is equivalent but doesn't overflow for any value of srclen.
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*/
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PR_EXTERN(char *)
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PL_Base64Decode
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(
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const char *src,
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PRUint32 srclen,
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char *dest
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);
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PR_END_EXTERN_C
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#endif /* _plbase64_h */
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