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42 lines
1.3 KiB
42 lines
1.3 KiB
3 months ago
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/*
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* UCW Library -- Base 224 Encoding & Decoding
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*
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* (c) 2002 Martin Mares <mj@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 base224_decode ucw_base224_decode
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#define base224_encode ucw_base224_encode
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#endif
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/**
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* Encodes @len bytes of data pointed to by @src by base224 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 base224_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 base224 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.
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*/
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uint base224_decode(byte *dest, const byte *src, uint len);
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/**
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* Use this macro to calculate @base224_encode() output buffer size.
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* It can happen 4 more bytes would be needed, this macro takes care
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* of that.
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*/
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#define BASE224_ENC_LENGTH(x) (((x)*8+38)/39*5)
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/*
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* When called for BASE224_IN_CHUNK-byte chunks, the result will be
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* always BASE224_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 BASE224_IN_CHUNK 39 /** Chunk size on the un-encoded side. **/
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#define BASE224_OUT_CHUNK 40 /** Chunk size on the encoded side. **/
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