mirror of git://git.psyc.eu/libpsyc
started new interface. incomplete.
This commit is contained in:
Mathias Laurenz Baumann
parent
37de85373c
commit
453011001d
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@ -1,4 +1,58 @@
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#include <stdint.h>
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#include <string.h>
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enum
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{
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}
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typedef struct
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{
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unsigned int length;
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const uint8_t *ptr;
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} PSYC_Array;
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typedef struct
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{
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unsigned int cursor; // current position in buffer
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PSYC_Array buffer;
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uint8_t flags;
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char inHeader;
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unsigned int length;
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} PSYC_State;
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inline PSYC_Array (const uint8_t memory, unsigned int length)
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{
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PSYC_Array arr = {length, memory};
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return arr;
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}
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inline void PSYC_initState (PSYC_State* state)
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{
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memset(state, 0, sizeof(PSYC_State));
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}
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inline void PSYC_nextBuffer (PSYC_State* state, PSYC_Array newBuf)
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{
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state->buffer = newBuf;
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}
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int PSYC_parse(PSYC_State* state,
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PSYC_ConstArray name,
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PSYC_ConstArray value,
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uint8_t modifier,
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unsigned long *expectedBytes);
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inline unsigned int PSYC_getBodyLength (PSYC_State* state)
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{
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return state->length;
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}
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/** @brief parses a routerVariable
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*
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355
src/parser.c
355
src/parser.c
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@ -43,181 +43,89 @@ inline char isAlphaNumeric(uint8_t c)
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}
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inline int PSYC_parseElement(
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unsigned int* cursor,
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const uint8_t * data, unsigned int dlength,
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const uint8_t** name, unsigned int *nlength,
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const uint8_t** value, unsigned int *vlength,
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char inHeader,char complete);
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/** @brief parses a routerVariable
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*
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* This function parses one routing variable,
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* advances the cursor after the variable,
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* writes the variables name, value and their
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* lengths in the corresponding out parameters
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* and returns 0 or an errorcode.
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*
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*
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*
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*
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* @param data pointer to the packet data
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* @param dlength length of the data (amount of bytes)
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* @param cursor pointer to the current parsing position.
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* should be initialized to 0.
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* @param name pointer-pointer, used to return the position
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* of the name string
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* @param nlength pointer to which the length of
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* the name string will be written
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* @param value pointer-pointer, used to retrun the position
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* of the value string
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* @param vlength pointer to which the length of
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* the value string will be written
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*
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* @returns 0 on success
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* 1 on insufficient data.
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* This does not advance
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* the cursor.
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* 2 header is now finished.
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* no more header variables follow
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* 3 the packet is complete.
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* >3 on a context error,
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* <0 on a parsing error.
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* This invalidates all but the cursor
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* out paramater. */
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int PSYC_parseHeader(
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unsigned int* cursor,
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const uint8_t * data, unsigned int dlength,
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const uint8_t** name, unsigned int *nlength,
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const uint8_t** value, unsigned int *vlength)
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{
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return PSYC_parseElement(cursor,data,dlength,name,nlength,value,vlength,1,0);
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}
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/** @brief parses one bodyelement
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*
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* This function is nearly identical to
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* its brother parseClosedBody. *
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*
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* It assumes that we don’t know the
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* real length of the packet and thus
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* searches for the terminator.
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*/
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extern int PSYC_parseOpenBody(
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unsigned int* cursor,
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const uint8_t * data, unsigned int dlength,
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const uint8_t** name, unsigned int *nlength,
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const uint8_t** value, unsigned int *vlength)
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int PSYC_parse(PSYC_State* state,
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PSYC_ConstArray name,
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PSYC_ConstArray value,
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uint8_t modifier,
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unsigned long *expectedBytes)
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{
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return PSYC_parseElement(cursor,data,dlength,name,nlength,value,vlength,0,0);
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}
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/** @brief parses one bodyelement
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*
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* This parses one body element, that is
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* either an entity-variable or the method
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*
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* The function assumes that dlength is set
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* to the exact length of the packet
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* so that data[dlength-1] would be the
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* ending "\n" of the packet.
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*
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* The parameters are nearly the same as for
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* PSYC_parseHeader, only difference is
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* that a returnvalue of 2 means, we encountered
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* the method.
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* This means that the out paramterer
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* name contains the methodname and
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* value the content.
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* */
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int PSYC_parseClosedBody(
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unsigned int* cursor,
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const uint8_t * data, unsigned int dlength,
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const uint8_t** name, unsigned int *nlength,
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const uint8_t** value, unsigned int *vlength)
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{
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return PSYC_parseElement(cursor,data,dlength,name,nlength,value,vlength,0,1);
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}
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/** @brief generalized linebased parser */
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inline int PSYC_parseElement(
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unsigned int* cursor,
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const uint8_t * data, unsigned int dlength,
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const uint8_t** name, unsigned int *nlength,
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const uint8_t** value, unsigned int *vlength,
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char inHeader,char complete)
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inline int PSYC_parse(
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PSYC_State* state,
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PSYC_Array* name, PSYC_Array* value
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uint8_t* modifier, unsigned long* expectedBytes)
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{
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/* first we test if we can access the first char */
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if(dlength<=*cursor) // cursor is not inside the length
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if(state->buffer.length<=state->cursor) // cursor is not inside the length
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return 1; // return insufficient data.
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// in case we return insufficent, we rewind to the start.
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unsigned int startc=*cursor;
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unsigned int startc=state->cursor;
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/* each line of the header starts with a glyph.
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* iE :_name, -_name +_name etc, so just test if
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* the first char is a glyph. */
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if(1==inHeader)
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if(1==state->inHeader)
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{
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if(!isGlyph(data[*cursor])) // is the first char not a glyph?
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if(!isGlyph(state->buffer.ptr[state->cursor])) // is the first char not a glyph?
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{
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// the only other possibility now is that the packet
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// is complete(empty packet) or that the method started.
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if(isAlphaNumeric(data[*cursor]))
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return 2; // return header finished
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if(data[*cursor] == '|')
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if(isAlphaNumeric(state->buffer.ptr[state->cursor]))
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{
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if(dlength<=++(*cursor)) // incremented cursor inside lenght?
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state->inHeader = 0;
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return 2; // return header finished
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}
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if(state->buffer.ptr[state->cursor] == '|')
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{
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if(state->buffer.length<=++(state->cursor)) // incremented cursor inside lenght?
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{
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*cursor=startc; // set to start value
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state->cursor=startc; // set to start value
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return 1; // return insufficient
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}
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if(data[*cursor]=='\n')
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if(state->buffer.ptr[state->cursor]=='\n')
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{
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++(*cursor);
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++(state->cursor);
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return 3; // return packet finished
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}
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}
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return -6; // report error
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}else // it is a glyph, so a variable name starts here
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{
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*name = data+*cursor;
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*nlength = 1;
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*modifier = *state->buffer.ptr+state->cursor;
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name->length = 0;
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}
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}
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char method=0;
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/* in the body, the same applies, only that the
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* method does not start with a glyph.*/
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if(0==inHeader && !isGlyph(data[*cursor]))
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if(0==state->inHeader && !isGlyph(state->buffer.ptr[state->cursor]))
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{
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if(!isAlphaNumeric(data[*cursor]) && data[*cursor] != '_')
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if(!isAlphaNumeric(state->buffer.ptr[state->cursor]) && state->buffer.ptr[state->cursor] != '_')
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{
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// the body rule is optional, which means
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// that now also just |\n can follow.
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if(data[*cursor] == '|')
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if(state->buffer.ptr[state->cursor] == '|')
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{
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if(dlength<=++(*cursor)) // incremented cursor inside lenght?
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if(state->buffer.length<=++(state->cursor)) // incremented cursor inside lenght?
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{
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*cursor=startc; // set to start value
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state->cursor=startc; // set to start value
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return 1; // return insufficient
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}
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if(data[*cursor]=='\n')
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if(state->buffer.ptr[state->cursor]=='\n')
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{
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++(*cursor);
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++(state->cursor);
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return 3; // return packet finished
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}
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}
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@ -225,21 +133,21 @@ inline int PSYC_parseElement(
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}
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else
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{
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*name = data+*cursor;
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*nlength=1;
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name->ptr = state->buffer.ptr+state->cursor;
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name->length=1;
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method=1;
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}
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}
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else
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{
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*name = data+*cursor;
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*nlength=1;
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name->ptr = state->buffer.ptr+state->cursor;
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name->length=1;
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}
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/* validate the incremented cursor */
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if(dlength <= ++(*cursor))
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if(state->buffer.length <= ++(state->cursor))
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{
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*cursor=startc;
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state->cursor=startc;
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return 1;
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}
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@ -247,136 +155,139 @@ inline int PSYC_parseElement(
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* allowed is alphanumeric and _ */
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// first char must exist.
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if(!isAlphaNumeric(data[*cursor]) // is it not alphanum
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&& data[*cursor] != '_') // AND not '_'. must be invalid then
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if(!isAlphaNumeric(state->buffer.ptr[state->cursor]) // is it not alphanum
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&& state->buffer.ptr[state->cursor] != '_') // AND not '_'. must be invalid then
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return -1; // return parser error.
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*nlength+=1;
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name->length+=1;
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/* now checking how long the name of the variable is. */
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unsigned int i=0;
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while(1)
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{
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if(dlength<= ++(*cursor)) // incremented cursor inside lenght?
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if(state->buffer.length<= ++(state->cursor)) // incremented cursor inside lenght?
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{
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*cursor=startc; // set to start value
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state->cursor=startc; // set to start value
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return 1; // return insufficient
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}
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// same as bevore
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if(!isAlphaNumeric(data[*cursor]) &&
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data[*cursor] != '_')
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if(!isAlphaNumeric(state->buffer.ptr[state->cursor]) &&
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state->buffer.ptr[state->cursor] != '_')
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break; // not valid? then stop the loop right here
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++(*nlength); // was a valid char, increase length
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++(name->length); // was a valid char, increase length
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}
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/* we now parsed the variable name successfully
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* after the name either a \n or a \t follows.
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*
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* for the method, the data starts after an \n
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* for the method, the state->buffer.ptr starts after an \n
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* so checking for \n too here
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* We dont check if cursor inside length, because
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* the last loop iteration did that already.
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*/
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if(data[*cursor] == '\t' || data[*cursor] == '\n') // && method==1))
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if(state->buffer.ptr[state->cursor] == '\t' || state->buffer.ptr[state->cursor] == '\n') // && method==1))
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{
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/* after the \t the arg-data follows, which is
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* anything but \n. arg-data can be of length 0
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/* after the \t the arg-state->buffer.ptr follows, which is
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* anything but \n. arg-state->buffer.ptr can be of length 0
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*
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* for the method: after the \n data follows,
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* for the method: after the \n state->buffer.ptr follows,
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* which is anything but \n|\n
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*
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* but data is optional, so we first check
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* here if data follows at all.
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* but state->buffer.ptr is optional, so we first check
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* here if state->buffer.ptr follows at all.
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*
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* arg-data=*value. we set value here so it
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* arg-state->buffer.ptr=value->ptr. we set value here so it
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* points to a valid range and so we point
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* to the first potential arg-data byte.
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* If there is no arg-data, we still have
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* to the first potential arg-state->buffer.ptr byte.
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* If there is no arg-state->buffer.ptr, we still have
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* the length attribute on 0. */
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if((method == 0 && data[*cursor] == '\n') /* emptyvar */ ||
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(method == 1 && *cursor+2 < dlength &&
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data[*cursor+1] == '|' &&
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data[*cursor+2] == '\n') /*no data */ )
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if((method == 0 && state->buffer.ptr[state->cursor] == '\n') /* emptyvar */ ||
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(method == 1 && state->cursor+2 < state->buffer.length &&
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state->buffer.ptr[state->cursor+1] == '|' &&
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state->buffer.ptr[state->cursor+2] == '\n') /*no state->buffer.ptr */ )
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{
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*value=data+*cursor;
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*vlength=0;
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value->ptr=state->buffer.ptr+state->cursor;
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value->length=0;
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}
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else
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{
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*value=data+*cursor+1;
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if(1== complete) // we know the length of the packet
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value->ptr=state->buffer.ptr+state->cursor+1;
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if (1==state->length) // we know the length of the packet
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{
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*vlength= dlength - *cursor -3;
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}else
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value->length= state->buffer.length - state->cursor -3;
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}
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else // else search for the terminator
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{
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*vlength=0;
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while(1)
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value->length=0;
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while (1)
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{
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if(dlength<=++(*cursor)) // incremented cursor inside lenght?
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if(state->buffer.length<=++(state->cursor)) // incremented cursor inside lenght?
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{
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*cursor=startc; // set to start value
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state->cursor=startc; // set to start value
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return 1; // return insufficient
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}
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if(0 == method && data[*cursor] == '\n')
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if(0 == method && state->buffer.ptr[state->cursor] == '\n')
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break;
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if(1 == method && data[*cursor] == '\n')
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if(1 == method && state->buffer.ptr[state->cursor] == '\n')
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{
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if(dlength<=(*cursor)+2) // incremented cursor inside lenght?
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if(state->buffer.length<=(state->cursor)+2) // incremented cursor inside lenght?
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{
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*cursor=startc; // set to start value
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state->cursor=startc; // set to start value
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return 1; // return insufficient
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}
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if(data[*cursor+1] == '|')
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if(data[*cursor+2] == '\n')
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if(state->buffer.ptr[state->cursor+1] == '|')
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if(state->buffer.ptr[state->cursor+2] == '\n')
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{
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/* packet finishes here */
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*cursor+=3;
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state->cursor+=3;
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return 3;
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}
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}
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++(*vlength);
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++(value->length);
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}
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}
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}
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}else if(inHeader == 0 && method==0 && data[*cursor] == ' ') // oi, its a binary var!
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}else if(state->inHeader == 0 && method==0 && state->buffer.ptr[state->cursor] == ' ') // oi, its a binary var!
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{ // after SP the length follows.
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const uint8_t * bin_length_str = data + *cursor+1;
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const uint8_t * bin_length_str = state->buffer.ptr + state->cursor+1;
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int strln = 0;
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do
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{
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if(dlength<=++(*cursor)) // incremented cursor inside lenght?
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if(state->buffer.length<=++(state->cursor)) // incremented cursor inside lenght?
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{
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*cursor=startc; // set to start value
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state->cursor=startc; // set to start value
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return 1; // return insufficient
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}
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++strln;
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}
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while(isNumeric(state->buffer.ptr[state->cursor]));
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}while(isNumeric(data[*cursor]));
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// after the length a TAB follows
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if(data[*cursor] != '\t')
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if (state->buffer.ptr[state->cursor] != '\t')
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return -8;
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// now we have the length. convert it to int
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int binLength = atoi(bin_length_str);
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// is that still in this buffer?
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if(dlength <= *cursor+binLength+1 )
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if(state->buffer.length <= state->cursor+binLength+1 )
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{
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*cursor=startc;
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state->cursor=startc;
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return 1;
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}
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*value = data + *cursor+1;
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*vlength=binLength;
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*cursor += binLength+1;
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||||
value->ptr = state->buffer.ptr + state->cursor+1;
|
||||
value->length=binLength;
|
||||
state->cursor += binLength+1;
|
||||
}else
|
||||
return -8;
|
||||
|
||||
|
|
@ -384,7 +295,7 @@ inline int PSYC_parseElement(
|
|||
|
||||
|
||||
/* if there was a \t, then we parsed up until the
|
||||
* \n char from the simple-arg rule ( \t arg-data \n )
|
||||
* \n char from the simple-arg rule ( \t arg-state->buffer.ptr \n )
|
||||
*
|
||||
* Now, if there would be no \t, we still would be at
|
||||
* the point where a \n must follow.
|
||||
|
|
@ -395,90 +306,36 @@ inline int PSYC_parseElement(
|
|||
*
|
||||
* again, the loop has already validated the cursors
|
||||
* position*/
|
||||
if(data[*cursor] != '\n')
|
||||
if(state->buffer.ptr[state->cursor] != '\n')
|
||||
return -2; // return parser error.
|
||||
|
||||
/* if a \n follows now, the an body is attached.
|
||||
* if not, a |\n must follow */
|
||||
if(dlength<=++(*cursor)) // incremented cursor inside lenght?
|
||||
if(state->buffer.length<=++(state->cursor)) // incremented cursor inside lenght?
|
||||
{
|
||||
*cursor=startc; // set to start value
|
||||
state->cursor=startc; // set to start value
|
||||
return 1; // return insufficient
|
||||
}
|
||||
|
||||
if(1 == inHeader && data[*cursor] == '\n')
|
||||
if(1 == state->inHeader && state->buffer.ptr[state->cursor] == '\n')
|
||||
{
|
||||
*cursor+=1;
|
||||
state->cursor+=1;
|
||||
state->inHeader = 0;
|
||||
return 2; // line is complete, but body starts now.
|
||||
}
|
||||
|
||||
if(data[*cursor] != '|') // no pipe, then only line complete, not the packet.
|
||||
if(state->buffer.ptr[state->cursor] != '|') // no pipe, then only line complete, not the packet.
|
||||
return 0;
|
||||
|
||||
if(dlength<=++(*cursor)) // incremented cursor inside lenght?
|
||||
if(state->buffer.length<=++(state->cursor)) // incremented cursor inside lenght?
|
||||
{
|
||||
*cursor=startc; // set to start value
|
||||
state->cursor=startc; // set to start value
|
||||
return 1; // return insufficient
|
||||
}
|
||||
if(data[*cursor] != '\n')
|
||||
if(state->buffer.ptr[state->cursor] != '\n')
|
||||
return -4;
|
||||
|
||||
*cursor+=1;
|
||||
state->cursor+=1;
|
||||
return 3; // packet is complete
|
||||
|
||||
|
||||
}
|
||||
|
||||
/** @brief parses one variable in two buffers
|
||||
*
|
||||
* This function is nearly identical to its
|
||||
* brother parseHeader. The difference is,
|
||||
* it uses two buffers and return parameters
|
||||
* for everything. It is meant to be used
|
||||
* in case parseHeader returned 2 for
|
||||
* insufficient data and you don’t
|
||||
* like to copy memory around to
|
||||
* have all the data in one buffer.
|
||||
* Using this function, you can pass two
|
||||
* data buffers. The consequence is,
|
||||
* that name and value can be distributed
|
||||
* on two different buffers and thus need
|
||||
* also two out paramaters. If only one
|
||||
* will be used, length of the second
|
||||
* will be 0.
|
||||
*
|
||||
* If your data is spread over more
|
||||
* than two buffers, you need to
|
||||
* copy that in one or two buffers.
|
||||
* Given the unlikleyness of that
|
||||
* event, we don't offer a three
|
||||
* or more buffer function here.
|
||||
*
|
||||
*/
|
||||
int PSYC_parseHeader2(
|
||||
unsigned int* cursor,
|
||||
const uint8_t * data1, unsigned int dlength1,
|
||||
const uint8_t * data2, unsigned int dlength2,
|
||||
const uint8_t** name1, unsigned int *nlength1,
|
||||
const uint8_t** name2, unsigned int *nlength2,
|
||||
const uint8_t** value1, unsigned int *vlength1,
|
||||
const uint8_t** value2, unsigned int *vlength2);
|
||||
|
||||
|
||||
/* @brief parses an bodyelement in two buffers
|
||||
*
|
||||
* This function is the brother of parseHeader2.
|
||||
* It behaives the same as
|
||||
* parseOpenBody and parseHeader2. */
|
||||
int PSYC_parseOpenBody2(
|
||||
unsigned int* cursor,
|
||||
const uint8_t * data1, unsigned int dlength1,
|
||||
const uint8_t * data2, unsigned int dlength2,
|
||||
const uint8_t** name1, unsigned int *nlength1,
|
||||
const uint8_t** name2, unsigned int *nlength2,
|
||||
const uint8_t** value1, unsigned int *vlength1,
|
||||
const uint8_t** value2, unsigned int *vlength2);
|
||||
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue