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71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
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#ifndef _CMF_H
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#define _CMF_H
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#include <stdbool.h>
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enum cmf_message_format {
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CMFMT_POSITIVE_NUMBER = 0,
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CMFMT_NEGATIVE_NUMBER = 1,
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CMFMT_STRING_UTF8 = 2,
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CMFMT_BYTES = 3,
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CMFMT_BOOL_TRUE = 4,
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CMFMT_BOOL_FALSE = 5
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// TODO double
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};
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enum cmf_parser_result {
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CMF_FOUND_TOKEN,
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CMF_PARSER_ERROR,
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CMF_DOCUMENT_END
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};
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/* builder API */
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/*
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* The cmfbuilder_add_* range of methods append data to an existing buffer.
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* The amount of data added is relative to the actual value passed because a variable-width byte encoding is being used.
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* The 'tag' takes at most 5 bytes. It takes zero bytes if the value is < 30.
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* The format (int/string/etc) is encoded and takes 1 byte.
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* The actual byte count used for the value is format dependent.
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* numbers take up to 9 bytes for a 64-bit value. (notice that negative numbers are multiplied by -1 before being encoded, so -1 is just 1 byte)
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* byte-arrays are just copied. Additional byte-count is the length. Also var-encoded.
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* booleans are free. No bytes taken.
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*
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* Please make sure enough bytes are available in the buffer as no effort is being made to avoid appending after the buffer.
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*/
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void cmfbuilder_add_int(unsigned char **ptr, unsigned int tag, int value);
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void cmfbuilder_add_ulong(unsigned char **ptr, unsigned int tag, unsigned long value);
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/*
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* Add-bytes allows the caller to specify the format specifically because the compact message format
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* supports both byte-arrays as well as utf-8 encoded strings.
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* Add the one you want to encoded. Notice that if you pass anything other than CMFMT_STRING_UTF8 or CMFMT_BYTES your
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* stream will be corrupted
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*/
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void cmfbuilder_add_bytes(unsigned char **ptr, unsigned int tag, const char *data, int length, enum cmf_message_format fmt);
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void cmfbuilder_add_bool(unsigned char **ptr, unsigned int tag, bool value);
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/* parser API */
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/*
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* The cmf parser method is essentially a SOX parser that allows really fast parsing and zero data-copy.
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*
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* The cmfparser_next() method can be called repeatedly until a certain token you wish to find has been located.
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* The actual token values are stored in the cmf_message_parser_token struct which can be reused for all calls.
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*/
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struct cmf_message_parser_token {
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int tag;
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enum cmf_message_format fmt;
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union {
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unsigned long big_num; /* Used when fmt is CMFMT_POSITIVE_NUMBER */
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long signed_num; /* Used when fmt is CMFMT_NEGATIVE_NUMBER */
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};
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const unsigned char *begin, *end; /* used for byte arrays and strings */
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};
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enum cmf_parser_result cmfparser_next(const unsigned char **ptr, const unsigned char * const endMessage, struct cmf_message_parser_token *token);
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#endif
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