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Side by Side Diff: nspr/lib/libc/include/plbase64.h

Issue 2078763002: Delete bundled copy of NSS and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/nss@master
Patch Set: Delete bundled copy of NSS and replace with README. Created 4 years, 6 months ago
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef _plbase64_h
7 #define _plbase64_h
8
9 #include "prtypes.h"
10
11 PR_BEGIN_EXTERN_C
12
13 /*
14 * PL_Base64Encode
15 *
16 * This routine encodes the data pointed to by the "src" parameter using the
17 * base64 algorithm, and returns a pointer to the result. If the "srclen"
18 * parameter is not zero, it specifies the length of the source data. If it
19 * is zero, the source data is assumed to be null-terminated, and PL_strlen
20 * is used to determine the source length. If the "dest" parameter is not
21 * null, it is assumed to point to a buffer of sufficient size (which may be
22 * calculated: ((srclen + 2)/3)*4) into which the encoded data is placed
23 * (without any termination). If the "dest" parameter is null, a buffer is
24 * allocated from the heap to hold the encoded data, and the result *will*
25 * be terminated with an extra null character. It is the caller's
26 * responsibility to free the result when it is allocated. A null is returned
27 * if the allocation fails.
28 *
29 * NOTE: when calculating ((srclen + 2)/3)*4), first ensure that
30 * srclen <= (PR_UINT32_MAX/4) * 3
31 * to avoid PRUint32 overflow.
32 */
33
34 PR_EXTERN(char *)
35 PL_Base64Encode
36 (
37 const char *src,
38 PRUint32 srclen,
39 char *dest
40 );
41
42 /*
43 * PL_Base64Decode
44 *
45 * This routine decodes the data pointed to by the "src" parameter using
46 * the base64 algorithm, and returns a pointer to the result. The source
47 * may either include or exclude any trailing '=' characters. If the
48 * "srclen" parameter is not zero, it specifies the length of the source
49 * data. If it is zero, PL_strlen will be used to determine the source
50 * length. If the "dest" parameter is not null, it is assumed to point to
51 * a buffer of sufficient size (which may be calculated: (srclen * 3)/4
52 * when srclen includes the '=' characters) into which the decoded data
53 * is placed (without any termination). If the "dest" parameter is null,
54 * a buffer is allocated from the heap to hold the decoded data, and the
55 * result *will* be terminated with an extra null character. It is the
56 * caller's responsibility to free the result when it is allocated. A null
57 * is retuned if the allocation fails, or if the source is not well-coded.
58 *
59 * NOTE: when calculating (srclen * 3)/4, first ensure that
60 * srclen <= PR_UINT32_MAX/3
61 * to avoid PRUint32 overflow. Alternatively, calculate
62 * (srclen/4) * 3 + ((srclen%4) * 3)/4
63 * which is equivalent but doesn't overflow for any value of srclen.
64 */
65
66 PR_EXTERN(char *)
67 PL_Base64Decode
68 (
69 const char *src,
70 PRUint32 srclen,
71 char *dest
72 );
73
74 PR_END_EXTERN_C
75
76 #endif /* _plbase64_h */
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