vcc.y

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

    if (lexBuf.strsLen > lexBuf.maxToken) {
	/* double the token string size */
	lexBuf.maxToken <<= 1;
	lexBuf.strs = (char*) realloc(lexBuf.strs,(size_t)lexBuf.maxToken);
	}
    }

static char* lexStr() {
    return dupStr(lexBuf.strs,(size_t)lexBuf.strsLen+1);
    }

static void lexSkipWhite() {
    int c = lexLookahead();
    while (c == ' ' || c == '\t') {
	lexSkipLookahead();
	c = lexLookahead();
	}
    }

static char* lexGetWord() {
    int c;
    lexSkipWhite();
    lexClearToken();
    c = lexLookahead();
    while (c != EOF && !strchr("\t\n ;:=",c)) {
	lexAppendc(c);
	lexSkipLookahead();
	c = lexLookahead();
	}
    lexAppendc(0);
    return lexStr();
    }

static void lexPushLookaheadc(int c) {
    int putptr;
    /* can't putback EOF, because it never leaves lookahead buffer */
    if (c == EOF) return;
    putptr = (int)lexBuf.getPtr - 1;
    if (putptr < 0) putptr += MAX_LEX_LOOKAHEAD;
    lexBuf.getPtr = putptr;
    lexBuf.buf[putptr] = c;
    lexBuf.len += 1;
    }

static char* lexLookaheadWord() {
    /* this function can lookahead word with max size of MAX_LEX_LOOKAHEAD_0
     /  and thing bigger than that will stop the lookahead and return 0;
     / leading white spaces are not recoverable.
     */
    int c;
    int len = 0;
    int curgetptr = 0;
    lexSkipWhite();
    lexClearToken();
    curgetptr = (int)lexBuf.getPtr;	// remember!
    while (len < (MAX_LEX_LOOKAHEAD_0)) {
	c = lexGetc();
	len++;
	if (c == EOF || strchr("\t\n ;:=", c)) {
	    lexAppendc(0);
	    /* restore lookahead buf. */
	    lexBuf.len += len;
	    lexBuf.getPtr = curgetptr;
	    return lexStr();
	    }
        else
	    lexAppendc(c);
	}
    lexBuf.len += len;	/* char that has been moved to lookahead buffer */
    lexBuf.getPtr = curgetptr;
    return 0;
    }

#ifdef _SUPPORT_LINE_FOLDING
static void handleMoreRFC822LineBreak(int c) {
    /* suport RFC 822 line break in cases like
     *	ADR: foo;
     *    morefoo;
     *    more foo;
     */
    if (c == ';') {
	int a;
	lexSkipLookahead();
	/* skip white spaces */
	a = lexLookahead();
	while (a == ' ' || a == '\t') {
	    lexSkipLookahead();
	    a = lexLookahead();
	    }
	if (a == '\n') {
	    lexSkipLookahead();
	    a = lexLookahead();
	    if (a == ' ' || a == '\t') {
		/* continuation, throw away all the \n and spaces read so
		 * far
		 */
		lexSkipWhite();
		lexPushLookaheadc(';');
		}
	    else {
		lexPushLookaheadc('\n');
		lexPushLookaheadc(';');
		}
	    }
	else {
	    lexPushLookaheadc(';');
	    }
	}
    }

static char* lexGet1Value() {
    int c;
    lexSkipWhite();
    c = lexLookahead();
    lexClearToken();
    while (c != EOF && (c != ';' || !fieldedProp)) {
	if (c == '\\' ) {
	    int a;
	    lexSkipLookahead();
	    a = lexLookahead();
	    if ( a == ';' ) {
		lexAppendc( ';' );
		lexSkipLookahead();
	    } else if ( a == '\n' ) {
		lexAppendc( '\n' );
		lexSkipLookahead();
	    } else if ( a == '\\' ) {
		lexAppendc( '\\' );
		lexSkipLookahead();
	    } else {
		lexAppendc('\\');
	    }
	} else if (c == '\n') {
	    int a;
	    lexSkipLookahead();
	    a  = lexLookahead();
	    if (a == ' ' || a == '\t') {
		lexAppendc(' ');
		lexSkipLookahead();
		}
	    else {
		lexPushLookaheadc('\n');
		break;
		}
	    }
	else {
	    lexAppendc(c);
	    lexSkipLookahead();
	    }
	c = lexLookahead();
	}
    lexAppendc(0);
    handleMoreRFC822LineBreak(c);
    return c==EOF?0:lexStr();
    }
#endif

static int match_begin_name(int end) {
    char *n = lexLookaheadWord();
    int token = ID;
    if (n) {
	if (!qstricmp(n,"vcard")) token = end?END_VCARD:BEGIN_VCARD;
	else if (!qstricmp(n,"vcalendar")) token = end?END_VCAL:BEGIN_VCAL;
	else if (!qstricmp(n,"vevent")) token = end?END_VEVENT:BEGIN_VEVENT;
	else if (!qstricmp(n,"vtodo")) token = end?END_VTODO:BEGIN_VTODO;
	deleteStr(n);
	return token;
	}
    return 0;
    }


#ifdef INCLUDEMFC
void initLex(const char *inputstring, unsigned long inputlen, CFile *inputfile)
#else
void initLex(const char *inputstring, unsigned long inputlen, FILE *inputfile)
#endif
    {
    // initialize lex mode stack
    lexBuf.lexModeStack[lexBuf.lexModeStackTop=0] = L_NORMAL;

    // iniatialize lex buffer.
    lexBuf.inputString = (char*) inputstring;
    lexBuf.inputLen = inputlen;
    lexBuf.curPos = 0;
    lexBuf.inputFile = inputfile;

    lexBuf.len = 0;
    lexBuf.getPtr = 0;

    lexBuf.maxToken = MAXTOKEN;
    lexBuf.strs = (char*)malloc(MAXTOKEN);
    lexBuf.strsLen = 0;

    }

static void finiLex() {
    free(lexBuf.strs);
    }


/*-----------------------------------*/
/* This parses and converts the base64 format for binary encoding into
 * a decoded buffer (allocated with new).  See RFC 1521.
 */
static int lexGetDataFromBase64()
    {
    unsigned long bytesLen = 0, bytesMax = 0;
    int quadIx = 0, pad = 0;
    unsigned long trip = 0;
    unsigned char b;
    int c;
    unsigned char *bytes = NULL;
    unsigned char *oldBytes = NULL;

    DBG_(("db: lexGetDataFromBase64\n"));
    while (1) {
	c = lexGetc();
	lexSkipWhite();
	if (c == '\n') {
	    ++mime_lineNum;
	    if (lexLookahead() == '\n') {
		/* a '\n' character by itself means end of data */
		break;
		}
	    else continue; /* ignore '\n' */
	    }
	else {
	    if ((c >= 'A') && (c <= 'Z'))
		b = (unsigned char)(c - 'A');
	    else if ((c >= 'a') && (c <= 'z'))
		b = (unsigned char)(c - 'a') + 26;
	    else if ((c >= '0') && (c <= '9'))
		b = (unsigned char)(c - '0') + 52;
	    else if (c == '+')
		b = 62;
	    else if (c == '/')
		b = 63;
	    else if (c == '=') {
		b = 0;
		pad++;
	    } else { /* error condition */
		if (bytes) free(bytes);
		else if (oldBytes) free(oldBytes);
		// error recovery: skip until 2 adjacent newlines.
		DBG_(("db: invalid character 0x%x '%c'\n", c,c));
		if (c != EOF)  {
		    c = lexGetc();
		    while (c != EOF) {
			if (c == '\n') {
			    lexSkipWhite();
			    if(lexLookahead() == '\n') {
				++mime_lineNum;
				break;
				}
			    }
			c = lexGetc();
			}
		    }
		return c != EOF;
		}
	    trip = (trip << 6) | b;
	    if (++quadIx == 4) {
		unsigned char outBytes[3];
		int numOut;
		int i;
		for (i = 0; i < 3; i++) {
		    outBytes[2-i] = (unsigned char)(trip & 0xFF);
		    trip >>= 8;
		    }
		numOut = 3 - pad;
		if (bytesLen + numOut > bytesMax) {
		    if (!bytes) {
			bytesMax = 1024;
			bytes = (unsigned char*)malloc((size_t)bytesMax);
			}
		    else {
			bytesMax <<= 2;
			oldBytes = bytes;
			bytes = (unsigned char*)realloc(bytes,(size_t)bytesMax);
			}
		    if (bytes == 0) {
			mime_error("out of memory while processing BASE64 data\n");
			}
		    }
		if (bytes) {
		    memcpy(bytes + bytesLen, outBytes, numOut);
		    bytesLen += numOut;
		    }
		trip = 0;
		quadIx = 0;
		}
	    }
	} /* while */
    DBG_(("db: bytesLen = %d\n",  bytesLen));
    /* kludge: all this won't be necessary if we have tree form
	representation */
    if (bytes) {
	setValueWithSize(curProp,bytes,(unsigned int)bytesLen);
	free(bytes);
	}
    else if (oldBytes) {
	setValueWithSize(curProp,oldBytes,(unsigned int)bytesLen);
	free(oldBytes);
	}
    return bytesLen;
    }

static int match_begin_end_name(int end) {
    int token;
    lexSkipWhite();
    if (lexLookahead() != ':') return ID;
    lexSkipLookahead();
    lexSkipWhite();
    token = match_begin_name(end);
    if (token == ID) {
	lexPushLookaheadc(':');
	DBG_(("db: ID '%s'\n", yylval.str));
	return ID;
	}
    else if (token != 0) {
	lexSkipLookaheadWord();
	deleteStr(yylval.str);
	DBG_(("db: begin/end %d\n", token));
	return token;
	}
    return 0;
    }

static char* lexGetQuotedPrintable()
{
    int c;
    lexSkipWhite();
    c = lexLookahead();
    lexClearToken();

    while (c != EOF && (c != ';' || !fieldedProp)) {
	if (c == '\n') {
	    // break, leave '\n' on remaining chars.
	    break;
	} else if (c == '=') {
	    int cur = 0;
	    int next;

	    lexSkipLookahead(); // skip '='
	    next = lexLookahead();

	    if (next == '\n') {
		// skip and only skip the \n
		lexSkipLookahead(); 
		c = lexLookahead();
		++mime_lineNum; // aid in error reporting
		continue;
	    } else if (next >= '0' && next <= '9') {
		cur = next - '0';
	    } else if (next >= 'A' && next <= 'F') {
		cur = next - 'A' + 10;
	    } else {
		// we have been sent buggy stuff. doesn't matter
		// what we do so long as we keep going.
		// should probably spit an error here
		lexSkipLookahead(); 
		c = lexLookahead();
		continue;
	    }

	    lexSkipLookahead(); // skip A-Z0-9
	    next = lexLookahead();

	    cur = cur * 16;
	    // this time really just expecting 0-9A-F
	    if (next >= '0' && next <= '9') {
		cur += next - '0';
	    } else if (next >= 'A' && next <= 'F') {
		cur += next - 'A' + 10;
	    } else {
		// we have been sent buggy stuff. doesn't matter
		// what we do so long as we keep going.
		// should probably spit an error here
		lexSkipLookahead(); 
		c = lexLookahead();
		continue;
	    }

	    // got a valid escaped =.  append it.
	    lexSkipLookahead(); // skip second 0-9A-F
	    lexAppendc(cur);
	} else {
	    lexSkipLookahead(); // skip whatever we just read.
	    lexAppendc(c); // and append it.
	}
	c = lexLookahead();
    }
    lexAppendc(0);
    return c==EOF?0:lexStr();
}

static int yylex() {

    int lexmode = LEXMODE();
    if (lexmode == L_VALUES) {
	int c = lexGetc();
	if (c == ';' && fieldedProp) {
	    DBG_(("db: SEMICOLON\n"));
	    lexPushLookaheadc(c);
	    handleMoreRFC822LineBreak(c);
	    lexSkipLookahead();
	    return SEMICOLON;
	    }
	else if (strchr("\n",c)) {
	    ++mime_lineNum;
	    /* consume all line separator(s) adjacent to each other */
	    c = lexLookahead();
	    while (strchr("\n",c)) {
		lexSkipLookahead();
		c = lexLookahead();
		++mime_lineNum;
		}
	    DBG_(("db: LINESEP\n"));
	    return LINESEP;
	    }
	else {
	    char *p = 0;
	    lexPushLookaheadc(c);
	    if (lexWithinMode(L_BASE64)) {
		/* get each char and convert to bin on the fly... */
		yylval.str = NULL;
		return lexGetDataFromBase64() ? STRING : 0;
		}
	    else if (lexWithinMode(L_QUOTED_PRINTABLE)) {
		p = lexGetQuotedPrintable();
		}
	    else {
#ifdef _SUPPORT_LINE_FOLDING
		p = lexGet1Value();
#else
		p = lexGetStrUntil(";\n");
#endif
		}
	    if (p) {
		DBG_(("db: STRING: '%s'\n", p));
		yylval.str = p;
		return STRING;
		}
	    else return 0;
	    }
	}
    else {
	/* normal mode */
	while (1) {
	    int c = lexGetc();
	    switch(c) {
		case ':': {
		    /* consume all line separator(s) adjacent to each other */
		    /* ignoring linesep immediately after colon. */
		    /* I don't see this in the spec, and it breaks null values -- WA
		    c = lexLookahead();
		    while (strchr("\n",c)) {
			lexSkipLookahead();
			c = lexLookahead();
			++mime_lineNum;
			}
		    */
		    DBG_(("db: COLON\n"));
		    return COLON;
		    }
		case ';':
		    DBG_(("db: SEMICOLON\n"));
		    return SEMICOLON;
		case '=':
		    DBG_(("db: EQ\n"));
		    return EQ;
		/* ignore whitespace in this mode */
		case '\t':
		case ' ': continue;
		case '\n': {
		    ++mime_lineNum;
		    continue;
		    }
		case EOF: return 0;
		    break;
		default: {
		    lexPushLookaheadc(c);
		    if (isalnum(c)) {
			char *t = lexGetWord();
			yylval.str = t;
			if (!qstricmp(t, "begin")) {
			    return match_begin_end_name(0);
			    }
			else if (!qstricmp(t,"end")) {
			    return match_begin_end_name(1);
			    }
		        else {
			    DBG_(("db: ID '%s'\n", t));
			    return ID;
			    }
			}
		    else {
			/* unknow token */
			return 0;
			}
		    break;
		    }
		}
	    }
	}
    return 0;
    }


/***************************************************************************/
/***							Public Functions						****/
/***************************************************************************/

static VObject* Parse_MIMEHelper()
    {
    ObjStackTop = -1;
    mime_numErrors = 0;
    mime_lineNum = 1;
    vObjList = 0;
    curObj = 0;

    if (yyparse() != 0)
	return 0;

    finiLex();
    return vObjList;
    }

/*--------------------------------------------*/
DLLEXPORT(VObject*) Parse_MIME(const char *input, unsigned long len)
    {
    initLex(input, len, 0);
    return Parse_MIMEHelper();
    }


#if INCLUDEMFC

DLLEXPORT(VObject*) Parse_MIME_FromFile(CFile *file)
    {
    unsigned long startPos;
    VObject *result;	

    initLex(0,-1,file);
    startPos = file->GetPosition();
    if (!(result = Parse_MIMEHelper()))
	file->Seek(startPos, CFile::begin);
    return result;
    }

#else

VObject* Parse_MIME_FromFile(FILE *file)
    {
    VObject *result;	
    long startPos;

    initLex(0,(unsigned long)-1,file);
    startPos = ftell(file);
    if (!(result = Parse_MIMEHelper())) {
	fseek(file,startPos,SEEK_SET);
	}
    return result;
    }

DLLEXPORT(VObject*) Parse_MIME_FromFileName(char *fname)
    {
    FILE *fp = fopen(fname,"r");
    if (fp) {
	VObject* o = Parse_MIME_FromFile(fp);
	fclose(fp);
	return o;
	}
    else {
	char msg[80];
	sprintf(msg, "can't open file '%s' for reading\n", fname);
	mime_error_(msg);
	return 0;
	}
    }

#endif

/*-------------------------------------*/

static MimeErrorHandler mimeErrorHandler;

DLLEXPORT(void) registerMimeErrorHandler(MimeErrorHandler me)
    {
    mimeErrorHandler = me;
    }

void mime_error(char *s)
    {
    char msg[256];
    if (mimeErrorHandler) {
	sprintf(msg,"%s at line %d", s, mime_lineNum);
	mimeErrorHandler(msg);
	}
    }

void mime_error_(char *s)
    {
    if (mimeErrorHandler) {
	mimeErrorHandler(s);
	}
    }