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