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64 lines
2.1 KiB
64 lines
2.1 KiB
2 months ago
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/*
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* UCW Library -- Base 64 Encoding & Decoding
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*
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* (c) 2002, Robert Spalek <robert@ucw.cz>
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* (c) 2017, Pavel Charvat <pchar@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#ifdef CONFIG_UCW_CLEAN_ABI
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#define base64_decode ucw_base64_decode
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#define base64_encode ucw_base64_encode
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#define base64_enc_table ucw_base64_enc_table
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#define base64_dec_table ucw_base64_dec_table
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#endif
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/**
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* Encodes @len bytes of data pointed to by @src by base64 encoding.
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* Stores them in @dest and returns the number of bytes the output
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* takes.
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*/
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uint base64_encode(byte *dest, const byte *src, uint len);
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/**
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* Decodes @len bytes of data pointed to by @src from base64 encoding.
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* All invalid characters are ignored. The result is stored into @dest
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* and length of the result is returned. It is allowed to use the
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* same buffer for both input and output.
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*/
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uint base64_decode(byte *dest, const byte *src, uint len);
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/**
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* Use this macro to calculate @base64_encode() output buffer size.
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*/
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#define BASE64_ENC_LENGTH(x) (((x)+2)/3 *4)
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/*
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* When called for BASE64_IN_CHUNK-byte chunks, the result will be
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* always BASE64_OUT_CHUNK bytes long. If a longer block is split
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* to such chunks, the result will be identical.
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*/
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#define BASE64_IN_CHUNK 3 /** Size of chunk on the un-encoded side. **/
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#define BASE64_OUT_CHUNK 4 /** Size of chunk on the encoded side. **/
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/*
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* Lookup table for fast encoding.
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* For each 6bit value contains corresponding base64 character.
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*/
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extern const byte base64_enc_table[65];
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#define BASE64_PADDING '=' /* Padding character */
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/*
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* Lookup table for fast decoding:
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* -- for valid base64 characters contains their 6bit values
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* -- for BASE64_PADDING character contains special value BASE64_DEC_PADDING
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* -- for all other characters contains BASE64_DEC_INVALID
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*
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* Note that BASE64_DEC_INVALID is greater than BASE64_DEC_PADDING
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* (can be useful to know for some optimizations).
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*/
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extern const byte base64_dec_table[256];
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#define BASE64_DEC_PADDING 0x40
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#define BASE64_DEC_INVALID 0x80
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