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Merge branch 'master' of supraverse.net:libpsyc

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Marenz 2011-04-19 21:55:36 +02:00
commit 906f5debaa
2 changed files with 113 additions and 90 deletions
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41
include/psyc/parser.h
View file

@ -69,44 +69,47 @@ typedef struct
typedef struct typedef struct
{ {
size_t cursor; /** current position in buffer */ size_t cursor; ///< current position in buffer
size_t startc; /** line start position */ size_t startc; ///< line start position
PSYC_Array buffer; PSYC_Array buffer;
uint8_t flags; uint8_t flags;
char part; /** part of the packet being parsed currently, see PSYC_Parts */ char part; ///< part of the packet being parsed currently, see PSYC_Parts
size_t contentParsed; /** number of bytes parsed from the content so far */ size_t contentParsed; ///< number of bytes parsed from the content so far
size_t contentLength; /** expected length of the content */ size_t contentLength; ///< expected length of the content
char contentLengthFound; /** is there a length given for this packet? */ char contentLengthFound; ///< is there a length given for this packet?
size_t valueParsed; /** number of bytes parsed from the value so far */ size_t valueParsed; ///< number of bytes parsed from the value so far
size_t valueLength; /** expected length of the value */ size_t valueLength; ///< expected length of the value
} PSYC_State; } PSYC_State;
typedef struct typedef struct
{ {
size_t cursor; /** current position in buffer */ size_t cursor; ///< current position in buffer
size_t startc; /** line start position */ size_t startc; ///< line start position
PSYC_Array buffer; PSYC_Array buffer;
char type; /** list type, see PSYC_ListTypes */ char type; ///< list type, see PSYC_ListTypes
size_t elemParsed; /** number of bytes parsed from the elem so far */ size_t elemParsed; ///< number of bytes parsed from the elem so far
size_t elemLength; /** expected length of the elem */ size_t elemLength; ///< expected length of the elem
} PSYC_ListState; } PSYC_ListState;
#ifndef PSYC_COMPILE_LIBRARY #ifndef PSYC_COMPILE_LIBRARY
/* @brief Shortcut for creating an array. /**
* Shortcut for creating an array.
* *
* @param memory Pointer to the buffer. * @param memory Pointer to the buffer.
* @param length Length of that buffer. * @param length Length of that buffer.
* *
* @return An instance of the PSYC_Array struct. */ * @return An instance of the PSYC_Array struct.
*/
inline PSYC_Array PSYC_createArray (uint8_t* const memory, size_t length) inline PSYC_Array PSYC_createArray (uint8_t* const memory, size_t length)
{ {
PSYC_Array arr = {length, memory}; PSYC_Array arr = {length, memory};
return arr; return arr;
} }
/* @brief Initiates the state struct with flags. /**
* Initiates the state struct with flags.
* *
* @param state Pointer to the state struct that should be initiated. * @param state Pointer to the state struct that should be initiated.
* @param flags The flags that one ones to set, see PSYC_Flags. * @param flags The flags that one ones to set, see PSYC_Flags.
@ -117,7 +120,8 @@ inline void PSYC_initState2 (PSYC_State* state, uint8_t flags )
state->flags = flags; state->flags = flags;
} }
/* @brief Initiates the state struct. /**
* Initiates the state struct.
* *
* @param state Pointer to the state struct that should be initiated. * @param state Pointer to the state struct that should be initiated.
*/ */
@ -126,7 +130,8 @@ inline void PSYC_initState (PSYC_State* state)
memset(state, 0, sizeof(PSYC_State)); memset(state, 0, sizeof(PSYC_State));
} }
/* @brief Initiates the list state struct. /**
* Initiates the list state struct.
* *
* @param state Pointer to the list state struct that should be initiated. * @param state Pointer to the list state struct that should be initiated.
*/ */

162
src/parser.c
View file

@ -14,9 +14,9 @@
return ret; \ return ret; \
} }
/** @brief isGlyph /**
* * Determines if the argument is a glyph.
* @todo: document this function * Glyphs are: : = + - ? !
*/ */
inline char isGlyph(uint8_t g) inline char isGlyph(uint8_t g)
{ {
@ -34,11 +34,17 @@ inline char isGlyph(uint8_t g)
} }
} }
/**
* Determines if the argument is numeric.
*/
inline char isNumeric(uint8_t c) inline char isNumeric(uint8_t c)
{ {
return c >= '0' && c <= '9'; return c >= '0' && c <= '9';
} }
/**
* Determines if the argument is alphanumeric.
*/
inline char isAlphaNumeric(uint8_t c) inline char isAlphaNumeric(uint8_t c)
{ {
return return
@ -47,14 +53,18 @@ inline char isAlphaNumeric(uint8_t c)
isNumeric(c); isNumeric(c);
} }
/**
* Determines if the argument is a keyword character.
* Keyword characters are: alphanumeric and _
*/
inline char isKwChar(uint8_t c) inline char isKwChar(uint8_t c)
{ {
return isAlphaNumeric(c) || c == '_'; return isAlphaNumeric(c) || c == '_';
} }
/** /**
* @brief Parse variable name or method name. * Parse variable name or method name.
* @details It should contain one or more keyword characters. * It should contain one or more keyword characters.
* @return PSYC_ERROR or PSYC_SUCCESS * @return PSYC_ERROR or PSYC_SUCCESS
*/ */
inline int PSYC_parseName(PSYC_State* state, PSYC_Array* name) inline int PSYC_parseName(PSYC_State* state, PSYC_Array* name)
@ -64,7 +74,7 @@ inline int PSYC_parseName(PSYC_State* state, PSYC_Array* name)
while (isKwChar(state->buffer.ptr[state->cursor])) while (isKwChar(state->buffer.ptr[state->cursor]))
{ {
name->length++; /* was a valid char, increase length */ name->length++; // was a valid char, increase length
ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT); ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT);
} }
@ -72,8 +82,8 @@ inline int PSYC_parseName(PSYC_State* state, PSYC_Array* name)
} }
/** /**
* @brief Parse binary data into value. * Parse binary data into value.
* @details length is the expected length of the data, parsed is the number of bytes parsed so far * length is the expected length of the data, parsed is the number of bytes parsed so far
* @return PSYC_COMPLETE or PSYC_INCOMPLETE * @return PSYC_COMPLETE or PSYC_INCOMPLETE
*/ */
inline int PSYC_parseBinaryValue(PSYC_State* state, PSYC_Array* value, size_t* length, size_t* parsed) inline int PSYC_parseBinaryValue(PSYC_State* state, PSYC_Array* value, size_t* length, size_t* parsed)
@ -81,7 +91,7 @@ inline int PSYC_parseBinaryValue(PSYC_State* state, PSYC_Array* value, size_t* l
size_t remaining = *length - *parsed; size_t remaining = *length - *parsed;
value->ptr = state->buffer.ptr + state->cursor; value->ptr = state->buffer.ptr + state->cursor;
if (state->cursor + remaining > state->buffer.length) /* is the length larger than this buffer? */ if (state->cursor + remaining > state->buffer.length) // is the length larger than this buffer?
{ {
value->length = state->buffer.length - state->cursor; value->length = state->buffer.length - state->cursor;
*parsed += value->length; *parsed += value->length;
@ -96,7 +106,7 @@ inline int PSYC_parseBinaryValue(PSYC_State* state, PSYC_Array* value, size_t* l
} }
/** /**
* @brief Parse simple or binary variable * Parse simple or binary variable.
* @return PSYC_ERROR or PSYC_SUCCESS * @return PSYC_ERROR or PSYC_SUCCESS
*/ */
inline int PSYC_parseVar(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Array* value) inline int PSYC_parseVar(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Array* value)
@ -109,10 +119,10 @@ inline int PSYC_parseVar(PSYC_State* state, uint8_t* modifier, PSYC_Array* name,
value->length = 0; value->length = 0;
/* Parse the value. // Parse the value.
* If we're in the content part check if it's a binary var */ // If we're in the content part check if it's a binary var.
if (state->part == PSYC_PART_CONTENT && state->buffer.ptr[state->cursor] == ' ') /* binary arg */ if (state->part == PSYC_PART_CONTENT && state->buffer.ptr[state->cursor] == ' ') // binary arg
{ /* After SP the length follows. */ { // After SP the length follows.
ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT); ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT);
state->valueLength = 0; state->valueLength = 0;
state->valueParsed = 0; state->valueParsed = 0;
@ -129,11 +139,11 @@ inline int PSYC_parseVar(PSYC_State* state, uint8_t* modifier, PSYC_Array* name,
else else
return PSYC_ERROR_VAR_LEN; return PSYC_ERROR_VAR_LEN;
/* After the length a TAB follows. */ // After the length a TAB follows.
if (state->buffer.ptr[state->cursor] != '\t') if (state->buffer.ptr[state->cursor] != '\t')
return PSYC_ERROR_VAR_TAB; return PSYC_ERROR_VAR_TAB;
if (state->buffer.length <= ++(state->cursor)) /* Incremented cursor inside length? */ if (state->buffer.length <= ++(state->cursor)) // Incremented cursor inside length?
return PSYC_ENTITY_INCOMPLETE; return PSYC_ENTITY_INCOMPLETE;
if (PSYC_parseBinaryValue(state, value, &(state->valueLength), &(state->valueParsed)) == PSYC_INCOMPLETE) if (PSYC_parseBinaryValue(state, value, &(state->valueLength), &(state->valueParsed)) == PSYC_INCOMPLETE)
@ -142,7 +152,7 @@ inline int PSYC_parseVar(PSYC_State* state, uint8_t* modifier, PSYC_Array* name,
state->cursor++; state->cursor++;
return PSYC_SUCCESS; return PSYC_SUCCESS;
} }
else if (state->buffer.ptr[state->cursor] == '\t') /* simple arg */ else if (state->buffer.ptr[state->cursor] == '\t') // simple arg
{ {
ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT); ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT);
value->ptr = state->buffer.ptr + state->cursor; value->ptr = state->buffer.ptr + state->cursor;
@ -159,49 +169,52 @@ inline int PSYC_parseVar(PSYC_State* state, uint8_t* modifier, PSYC_Array* name,
return PSYC_ERROR_VAR_TAB; return PSYC_ERROR_VAR_TAB;
} }
/** @brief Generalized line-based parser. */ /**
* Parse PSYC packets.
* Generalized line-based parser.
* @return see PSYC_ReturnCodes
*/
int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Array* value) int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Array* value)
{ {
int ret; /* a return value */ int ret; // a return value
size_t pos; /* a cursor position */ size_t pos; // a cursor position
/* Start position of the current line in the buffer // Start position of the current line in the buffer
* in case we return insufficent, we rewind to this position. */ // in case we return insufficent, we rewind to this position.
state->startc = state->cursor; state->startc = state->cursor;
/* First we test if we can access the first char. */ // First we test if we can access the first char.
if (state->cursor >= state->buffer.length) /* cursor is not inside the length */ if (state->cursor >= state->buffer.length) // cursor is not inside the length
return PSYC_INSUFFICIENT; /* return insufficient data. */ return PSYC_INSUFFICIENT;
switch (state->part) switch (state->part)
{ {
case PSYC_PART_RESET: /* New packet starts here, reset state. */ case PSYC_PART_RESET: // New packet starts here, reset state.
state->valueParsed = 0; state->valueParsed = 0;
state->valueLength = 0; state->valueLength = 0;
state->contentParsed = 0; state->contentParsed = 0;
state->contentLength = 0; state->contentLength = 0;
state->contentLengthFound = 0; state->contentLengthFound = 0;
state->part = PSYC_PART_HEADER; state->part = PSYC_PART_HEADER;
/* fall thru */ // fall thru
case PSYC_PART_HEADER: case PSYC_PART_HEADER:
/* Each line of the header starts with a glyph, // Each line of the header starts with a glyph,
* i.e. :_name, -_name +_name etc, // i.e. :_name, -_name +_name etc,
* so just test if the first char is a glyph. // so just test if the first char is a glyph.
*/ if (isGlyph(state->buffer.ptr[state->cursor])) // is the first char a glyph?
if (isGlyph(state->buffer.ptr[state->cursor])) /* is the first char a glyph? */ { // it is a glyph, so a variable starts here
{ /* it is a glyph, so a variable starts here */
ret = PSYC_parseVar(state, modifier, name, value); ret = PSYC_parseVar(state, modifier, name, value);
return ret == PSYC_SUCCESS ? PSYC_ROUTING : ret; return ret == PSYC_SUCCESS ? PSYC_ROUTING : ret;
} }
else /* not a glyph */ else // not a glyph
{ {
state->part = PSYC_PART_LENGTH; state->part = PSYC_PART_LENGTH;
/* fall thru */ // fall thru
} }
case PSYC_PART_LENGTH: case PSYC_PART_LENGTH:
/* End of header, content starts with an optional length then a NL */ // End of header, content starts with an optional length then a NL
if (isNumeric(state->buffer.ptr[state->cursor])) if (isNumeric(state->buffer.ptr[state->cursor]))
{ {
state->contentLengthFound = 1; state->contentLengthFound = 1;
@ -214,17 +227,18 @@ int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Arra
while (isNumeric(state->buffer.ptr[state->cursor])); while (isNumeric(state->buffer.ptr[state->cursor]));
} }
if (state->buffer.ptr[state->cursor] == '\n') /* start of content */ if (state->buffer.ptr[state->cursor] == '\n') // start of content
{ {
/* If we need to parse the header only and we know the content length, then skip content parsing. */ // If we need to parse the header only and we know the content length,
// then skip content parsing.
if (state->flags & PSYC_HEADER_ONLY && state->contentLengthFound) if (state->flags & PSYC_HEADER_ONLY && state->contentLengthFound)
state->part = PSYC_PART_DATA; state->part = PSYC_PART_DATA;
else else
state->part = PSYC_PART_CONTENT; state->part = PSYC_PART_CONTENT;
} }
else /* Not start of content, this must be the end. */ else // Not start of content, this must be the end.
{ {
/* If we have a length then it should've been followed by a \n */ // If we have a length then it should've been followed by a \n
if (state->contentLengthFound) if (state->contentLengthFound)
return PSYC_ERROR_LENGTH; return PSYC_ERROR_LENGTH;
@ -234,22 +248,21 @@ int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Arra
ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT); ADVANCE_CURSOR_OR_RETURN(PSYC_INSUFFICIENT);
state->startc = state->cursor; state->startc = state->cursor;
/* fall thru */ // fall thru
case PSYC_PART_CONTENT: case PSYC_PART_CONTENT:
/* In case of an incomplete binary variable resume parsing it. */ // In case of an incomplete binary variable resume parsing it.
if (state->valueParsed < state->valueLength) { if (state->valueParsed < state->valueLength) {
ret = PSYC_parseBinaryValue(state, value, &(state->valueLength), &(state->valueParsed)); ret = PSYC_parseBinaryValue(state, value, &(state->valueLength), &(state->valueParsed));
state->contentParsed += value->length; state->contentParsed += value->length;
return ret == PSYC_COMPLETE ? PSYC_ENTITY : PSYC_ENTITY_INCOMPLETE; return ret == PSYC_COMPLETE ? PSYC_ENTITY : PSYC_ENTITY_INCOMPLETE;
} }
/* Each line of the header starts with a glyph, // Each line of the header starts with a glyph,
* i.e. :_name, -_name +_name etc. // i.e. :_name, -_name +_name etc.
* So just test if the first char is a glyph. // So just test if the first char is a glyph.
* In the body, the same applies, only that the // In the body, the same applies, only that the
* method does not start with a glyph. // method does not start with a glyph.
*/
if (isGlyph(state->buffer.ptr[state->cursor])) if (isGlyph(state->buffer.ptr[state->cursor]))
{ {
pos = state->cursor; pos = state->cursor;
@ -261,13 +274,13 @@ int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Arra
{ {
state->part = PSYC_PART_METHOD; state->part = PSYC_PART_METHOD;
state->startc = state->cursor; state->startc = state->cursor;
/* fall thru */ // fall thru
} }
case PSYC_PART_METHOD: case PSYC_PART_METHOD:
pos = state->cursor; pos = state->cursor;
if (PSYC_parseName(state, name) == PSYC_SUCCESS) if (PSYC_parseName(state, name) == PSYC_SUCCESS)
{ /* the method ends with a \n then the data follows */ { // the method ends with a \n then the data follows
if (state->buffer.ptr[state->cursor] != '\n') if (state->buffer.ptr[state->cursor] != '\n')
return PSYC_ERROR_METHOD; return PSYC_ERROR_METHOD;
@ -277,9 +290,9 @@ int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Arra
state->part = PSYC_PART_DATA; state->part = PSYC_PART_DATA;
if (state->cursor >= state->buffer.length) if (state->cursor >= state->buffer.length)
return PSYC_INSUFFICIENT; return PSYC_INSUFFICIENT;
/* fall thru */ // fall thru
} }
else /* No method, which means the packet should end now. */ else // No method, which means the packet should end now.
{ {
state->part = PSYC_PART_END; state->part = PSYC_PART_END;
state->startc = state->cursor; state->startc = state->cursor;
@ -290,7 +303,7 @@ int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Arra
value->ptr = state->buffer.ptr + state->cursor; value->ptr = state->buffer.ptr + state->cursor;
value->length = 0; value->length = 0;
if (state->contentLengthFound) /* We know the length of the packet. */ if (state->contentLengthFound) // We know the length of the packet.
{ {
if (PSYC_parseBinaryValue(state, value, &(state->contentLength), &(state->contentParsed)) == PSYC_INCOMPLETE) if (PSYC_parseBinaryValue(state, value, &(state->contentLength), &(state->contentParsed)) == PSYC_INCOMPLETE)
return PSYC_BODY_INCOMPLETE; return PSYC_BODY_INCOMPLETE;
@ -299,20 +312,20 @@ int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Arra
state->part = PSYC_PART_END; state->part = PSYC_PART_END;
return PSYC_BODY; return PSYC_BODY;
} }
else /* Search for the terminator. */ else // Search for the terminator.
{ {
while (1) while (1)
{ {
if (state->buffer.ptr[state->cursor] == '\n') if (state->buffer.ptr[state->cursor] == '\n')
{ {
if (state->cursor+2 >= state->buffer.length) /* incremented cursor inside length? */ if (state->cursor+2 >= state->buffer.length) // incremented cursor inside length?
{ {
state->cursor = state->startc; state->cursor = state->startc;
return PSYC_INSUFFICIENT; return PSYC_INSUFFICIENT;
} }
if (state->buffer.ptr[state->cursor+1] == '|' && if (state->buffer.ptr[state->cursor+1] == '|' &&
state->buffer.ptr[state->cursor+2] == '\n') /* packet ends here */ state->buffer.ptr[state->cursor+2] == '\n') // packet ends here
{ {
state->cursor++; state->cursor++;
state->part = PSYC_PART_END; state->part = PSYC_PART_END;
@ -326,28 +339,31 @@ int PSYC_parse(PSYC_State* state, uint8_t* modifier, PSYC_Array* name, PSYC_Arra
case PSYC_PART_END: case PSYC_PART_END:
PSYC_PART_END: PSYC_PART_END:
/* End of packet, at this point we have already passed a \n // End of packet, at this point we have already passed a \n
and the cursor should point to | */ // and the cursor should point to |
if (state->cursor+1 >= state->buffer.length) /* incremented cursor inside length? */ if (state->cursor+1 >= state->buffer.length) // incremented cursor inside length?
return PSYC_INSUFFICIENT; return PSYC_INSUFFICIENT;
if (state->buffer.ptr[state->cursor] == '|' && if (state->buffer.ptr[state->cursor] == '|' &&
state->buffer.ptr[state->cursor+1] == '\n') /* packet ends here */ state->buffer.ptr[state->cursor+1] == '\n') // packet ends here
{ {
state->cursor += 2; state->cursor += 2;
state->part = PSYC_PART_RESET; state->part = PSYC_PART_RESET;
return PSYC_COMPLETE; return PSYC_COMPLETE;
} }
else /* packet should've ended here, return error */ else // packet should've ended here, return error
{ {
state->part = PSYC_PART_RESET; state->part = PSYC_PART_RESET;
return PSYC_ERROR_END; return PSYC_ERROR_END;
} }
} }
return PSYC_ERROR; /* should not be reached */ return PSYC_ERROR; // should not be reached
} }
/** @brief list parser */ /**
* List value parser.
* @return see PSYC_ListReturnCodes.
*/
int PSYC_parseList(PSYC_ListState* state, PSYC_Array *name, PSYC_Array* value, PSYC_Array* elem) int PSYC_parseList(PSYC_ListState* state, PSYC_Array *name, PSYC_Array* value, PSYC_Array* elem)
{ {
if (state->cursor >= state->buffer.length) if (state->cursor >= state->buffer.length)
@ -355,13 +371,13 @@ int PSYC_parseList(PSYC_ListState* state, PSYC_Array *name, PSYC_Array* value, P
state->startc = state->cursor; state->startc = state->cursor;
if (!state->type) /* If type is not set we're at the start */ if (!state->type) // If type is not set we're at the start
{ {
if (name->length < 5 || memcmp(name->ptr, "_list", 5) != 0 || if (name->length < 5 || memcmp(name->ptr, "_list", 5) != 0 ||
(name->length > 5 && name->ptr[5] != '_')) /* name should be _list or should start with _list_ */ (name->length > 5 && name->ptr[5] != '_')) // name should be _list or should start with _list_
return PSYC_ERROR_LIST_NAME; return PSYC_ERROR_LIST_NAME;
/* First character is either | for text lists, or a number for binary lists */ // First character is either | for text lists, or a number for binary lists
if (state->buffer.ptr[state->cursor] == '|') if (state->buffer.ptr[state->cursor] == '|')
{ {
state->type = PSYC_LIST_TEXT; state->type = PSYC_LIST_TEXT;
@ -390,10 +406,11 @@ int PSYC_parseList(PSYC_ListState* state, PSYC_Array *name, PSYC_Array* value, P
state->cursor++; state->cursor++;
return PSYC_LIST_ELEM; return PSYC_LIST_ELEM;
} }
else /* binary list */ else // binary list
{ {
if (!(state->elemParsed < state->elemLength)) { if (!(state->elemParsed < state->elemLength))
/* Element starts with a number. */ {
// Element starts with a number.
if (isNumeric(state->buffer.ptr[state->cursor])) if (isNumeric(state->buffer.ptr[state->cursor]))
{ {
do do
@ -415,8 +432,9 @@ int PSYC_parseList(PSYC_ListState* state, PSYC_Array *name, PSYC_Array* value, P
state->elemParsed = 0; state->elemParsed = 0;
} }
/* Start or resume parsing the binary data */ // Start or resume parsing the binary data
if (state->elemParsed < state->elemLength) { if (state->elemParsed < state->elemLength)
{
if (PSYC_parseBinaryValue((PSYC_State*)state, elem, &(state->elemLength), &(state->elemParsed)) == PSYC_INCOMPLETE) if (PSYC_parseBinaryValue((PSYC_State*)state, elem, &(state->elemLength), &(state->elemParsed)) == PSYC_INCOMPLETE)
return PSYC_LIST_INCOMPLETE; return PSYC_LIST_INCOMPLETE;
@ -433,5 +451,5 @@ int PSYC_parseList(PSYC_ListState* state, PSYC_Array *name, PSYC_Array* value, P
} }
} }
return PSYC_ERROR_LIST; /* should not be reached */ return PSYC_ERROR_LIST; // should not be reached
} }