| /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
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| |
| #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 */ |
