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-rw-r--r--nsprpub/lib/libc/include/plbase64.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/nsprpub/lib/libc/include/plbase64.h b/nsprpub/lib/libc/include/plbase64.h
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+++ b/nsprpub/lib/libc/include/plbase64.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _plbase64_h
+#define _plbase64_h
+
+#include "prtypes.h"
+
+PR_BEGIN_EXTERN_C
+
+/*
+ * PL_Base64Encode
+ *
+ * This routine encodes the data pointed to by the "src" parameter using the
+ * base64 algorithm, and returns a pointer to the result. If the "srclen"
+ * parameter is not zero, it specifies the length of the source data. If it
+ * is zero, the source data is assumed to be null-terminated, and PL_strlen
+ * is used to determine the source length. If the "dest" parameter is not
+ * null, it is assumed to point to a buffer of sufficient size (which may be
+ * calculated: ((srclen + 2)/3)*4) into which the encoded data is placed
+ * (without any termination). If the "dest" parameter is null, a buffer is
+ * allocated from the heap to hold the encoded data, and the result *will*
+ * be terminated with an extra null character. It is the caller's
+ * responsibility to free the result when it is allocated. A null is returned
+ * if the allocation fails.
+ *
+ * NOTE: when calculating ((srclen + 2)/3)*4), first ensure that
+ * srclen <= (PR_UINT32_MAX/4) * 3
+ * to avoid PRUint32 overflow.
+ */
+
+PR_EXTERN(char *)
+PL_Base64Encode
+(
+ const char *src,
+ PRUint32 srclen,
+ char *dest
+);
+
+/*
+ * PL_Base64Decode
+ *
+ * This routine decodes the data pointed to by the "src" parameter using
+ * the base64 algorithm, and returns a pointer to the result. The source
+ * may either include or exclude any trailing '=' characters. If the
+ * "srclen" parameter is not zero, it specifies the length of the source
+ * data. If it is zero, PL_strlen will be used to determine the source
+ * length. If the "dest" parameter is not null, it is assumed to point to
+ * a buffer of sufficient size (which may be calculated: (srclen * 3)/4
+ * when srclen includes the '=' characters) into which the decoded data
+ * is placed (without any termination). If the "dest" parameter is null,
+ * a buffer is allocated from the heap to hold the decoded data, and the
+ * result *will* be terminated with an extra null character. It is the
+ * caller's responsibility to free the result when it is allocated. A null
+ * is retuned if the allocation fails, or if the source is not well-coded.
+ *
+ * NOTE: when calculating (srclen * 3)/4, first ensure that
+ * srclen <= PR_UINT32_MAX/3
+ * to avoid PRUint32 overflow. Alternatively, calculate
+ * (srclen/4) * 3 + ((srclen%4) * 3)/4
+ * which is equivalent but doesn't overflow for any value of srclen.
+ */
+
+PR_EXTERN(char *)
+PL_Base64Decode
+(
+ const char *src,
+ PRUint32 srclen,
+ char *dest
+);
+
+PR_END_EXTERN_C
+
+#endif /* _plbase64_h */