home *** CD-ROM | disk | FTP | other *** search
- /******************************************************************************
- * Bsp_Read.c - Bspline handling routines - read from file. *
- *******************************************************************************
- * Written by Gershon Elber, Aug. 90. *
- ******************************************************************************/
-
- #include <ctype.h>
- #include <stdio.h>
- #include <string.h>
- #include "prsr_loc.h"
-
- /*****************************************************************************
- * DESCRIPTION: M
- * Reads from a file Bspline curve(s). M
- * If error is detected in reading the file, ErrStr is set to a string M
- * describing the error and Line to the line it occured in file. M
- * If no error is detected *ErrStr = NULL. M
- * *
- * PARAMETERS: M
- * FileName: To read the Bspline curve from. M
- * ErrStr: Will be initialized if an error has occured. M
- * ErrLine: Line number in file FileName of the error, if occured. M
- * *
- * RETURN VALUE: M
- * CagdCrvStruct *: The read curve, or NULL if an error occured. M
- * *
- * KEYWORDS: M
- * BspCrvReadFromFile, files, read M
- *****************************************************************************/
- CagdCrvStruct *BspCrvReadFromFile(char *FileName, char **ErrStr, int *ErrLine)
- {
- int Handler;
- FILE *f;
- char StringToken[LINE_LEN];
- CagdCrvStruct *Crv,
- *CrvTail = NULL,
- *CrvList = NULL;
-
- if ((f = fopen(FileName, "r")) == NULL) {
- *ErrStr = "File not found";
- *ErrLine = 0;
- return NULL;
- }
- Handler = IritPrsrOpenStreamFromFile(f, TRUE,
- IritPrsrSenseBinaryFile(FileName),
- FALSE);
-
- while (_IPGetToken(Handler, StringToken) == IP_TOKEN_OPEN_PAREN) {
- _IPUnGetToken(Handler, StringToken);
- Crv = BspCrvReadFromFile2(Handler, FALSE, ErrStr, ErrLine);
-
- if (CrvList == NULL)
- CrvList = CrvTail = Crv;
- else {
- CrvTail -> Pnext = Crv;
- CrvTail = Crv;
- }
- }
-
- IritPrsrCloseStream(Handler, TRUE);
-
- return CrvList;
- }
-
- /*****************************************************************************
- * DESCRIPTION: M
- * Reads from a file a Bspline curve. M
- * If NameWasRead is TRUE, it is assumed prefix "[CURVE BSPLINE" has M
- * already been read. This is useful for a global parser which invokes this M
- * routine to read from a file several times as a parent controller. M
- * For exactly this reason, the given file descriptor is NOT closed in the M
- * end. M
- * If error is found in reading the file, ErrStr is set to a string M
- * describing it and ErrLine to line it occured in file relative to begining M
- * of curve. M
- * If no error is detected *ErrStr is set to NULL. M
- * *
- * PARAMETERS: M
- * Handler: A handler to the open stream. M
- * NameWasRead: TRUE if "[CURVE BSPLINE" has been read, FALSE otherwise. M
- * ErrStr: Will be initialized if an error has occured. M
- * ErrLine: Line number in file FileName of the error, if occured. M
- * *
- * RETURN VALUE: M
- * CagdCrvStruct *: The read curve, or NULL if an error occured. M
- * *
- * KEYWORDS: M
- * BspCrvReadFromFile2, files, read, stream M
- *****************************************************************************/
- CagdCrvStruct *BspCrvReadFromFile2(int Handler,
- CagdBType NameWasRead,
- char **ErrStr,
- int *ErrLine)
- {
- CagdPointType PType;
- IPTokenType Token;
- int i, j, Length, Order, MaxCoord, KVPeriodic;
- char StringToken[LINE_LEN];
- CagdCrvStruct *NewCrv;
-
- if (!NameWasRead) {
- while ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_EOF &&
- Token != IP_TOKEN_OPEN_PAREN);
-
- /* We found beginning of definition - read one: */
- if (_IPGetToken(Handler, StringToken) != IP_TOKEN_CURVE ||
- _IPGetToken(Handler, StringToken) != IP_TOKEN_BSPLINE) {
- *ErrStr = "CURVE BSPLINE key words expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- }
-
- if ((Token = _IPGetToken(Handler, StringToken)) == IP_TOKEN_OPEN_PAREN) {
- if ((*ErrStr = _IPGetCurveAttributes(Handler)) != NULL) {
- *ErrStr = "\"[\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- }
- else
- _IPUnGetToken(Handler, StringToken);
-
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OTHER ||
- sscanf(StringToken, "%d", &Length) != 1) {
- *ErrStr = "BSPLINE Number of points expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
-
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OTHER ||
- sscanf(StringToken, "%d", &Order) != 1) {
- *ErrStr = "BSPLINE Order expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
-
- Token = _IPGetToken(Handler, StringToken);
- if (!IP_IS_TOKEN_POINT(Token) ||
- strlen(StringToken) != 2 ||
- (StringToken[0] != 'E' && StringToken[0] != 'P') ||
- !isdigit(StringToken[1]) ||
- atoi(&StringToken[1]) > CAGD_MAX_PT_COORD) {
- *ErrStr = "BSPLINE Point type expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
-
- PType = CAGD_MAKE_PT_TYPE(StringToken[0] == 'P', atoi(&StringToken[1]));
-
- /* Read the knot vector first: */
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OPEN_PAREN) {
- *ErrStr = "\"[\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_KV) {
- if (Token == IP_TOKEN_KVP) {
- KVPeriodic = TRUE;
- }
- else {
- *ErrStr = "KV expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- }
- else
- KVPeriodic = FALSE;
-
- NewCrv = KVPeriodic ? BspPeriodicCrvNew(Length, Order, TRUE, PType)
- : BspCrvNew(Length, Order, PType);
-
- for (i = 0; i < Order + Length + (KVPeriodic ? Order - 1 : 0); i++) {
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OTHER ||
- sscanf(StringToken, IP_FLOAT_READ,
- &NewCrv -> KnotVector[i]) != 1) {
- *ErrStr = "Numeric data expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdCrvFree(NewCrv);
- return NULL;
- }
- }
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_CLOSE_PAREN) {
- *ErrStr = "\"]\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdCrvFree(NewCrv);
- return NULL;
- }
-
- /* Read the points themselves: */
- MaxCoord = CAGD_NUM_OF_PT_COORD(PType);
- for (i = 0; i < Length; i++) {
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OPEN_PAREN) {
- *ErrStr = "\"[\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdCrvFree(NewCrv);
- return NULL;
- }
- if (CAGD_IS_RATIONAL_PT(PType)) {
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OTHER ||
- sscanf(StringToken, IP_FLOAT_READ,
- &NewCrv -> Points[0][i]) != 1) {
- *ErrStr = "Numeric data expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdCrvFree(NewCrv);
- return NULL;
- }
- }
- for (j = 1; j <= MaxCoord; j++) {
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OTHER ||
- sscanf(StringToken, IP_FLOAT_READ,
- &NewCrv -> Points[j][i]) != 1) {
- *ErrStr = "Numeric data expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdCrvFree(NewCrv);
- return NULL;
- }
- }
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_CLOSE_PAREN) {
- *ErrStr = "\"]\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdCrvFree(NewCrv);
- return NULL;
- }
- }
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_CLOSE_PAREN) {
- *ErrStr = "\"]\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdCrvFree(NewCrv);
- return NULL;
- }
-
- *ErrLine = _IPStream[Handler].LineNum;
- *ErrStr = NULL;
-
- return NewCrv;
- }
-
- /*****************************************************************************
- * DESCRIPTION: M
- * Reads from a file Bspline surface(s). M
- * If error is detected in reading the file, ErrStr is set to a string M
- * describing the error and Line to the line it occured in file. M
- * If no error is detected *ErrStr = NULL. M
- * *
- * PARAMETERS: M
- * FileName: To read the Bspline surface from. M
- * ErrStr: Will be initialized if an error has occured. M
- * ErrLine: Line number in file FileName of the error, if occured. M
- * *
- * RETURN VALUE: M
- * CagdSrfStruct *: The read surface, or NULL if an error occured. M
- * *
- * KEYWORDS: M
- * BspSrfReadFromFile, files, read M
- *****************************************************************************/
- CagdSrfStruct *BspSrfReadFromFile(char *FileName, char **ErrStr, int *ErrLine)
- {
- int Handler;
- FILE *f;
- char StringToken[LINE_LEN];
- CagdSrfStruct *Srf,
- *SrfTail = NULL,
- *SrfList = NULL;
-
- if ((f = fopen(FileName, "r")) == NULL) {
- *ErrStr = "File not found";
- *ErrLine = 0;
- return NULL;
- }
- Handler = IritPrsrOpenStreamFromFile(f, TRUE,
- IritPrsrSenseBinaryFile(FileName),
- FALSE);
-
- while (_IPGetToken(Handler, StringToken) == IP_TOKEN_OPEN_PAREN) {
- _IPUnGetToken(Handler, StringToken);
- Srf = BspSrfReadFromFile2(Handler, FALSE, ErrStr, ErrLine);
-
- if (SrfList == NULL)
- SrfList = SrfTail = Srf;
- else {
- SrfTail -> Pnext = Srf;
- SrfTail = Srf;
- }
- }
-
- IritPrsrCloseStream(Handler, TRUE);
-
- return SrfList;
- }
-
- /*****************************************************************************
- * DESCRIPTION: M
- * Reads from a file a Bspline surface. M
- * If NameWasRead is TRUE, it is assumed prefix "[SURFACE BSPLINE" has M
- * already been read. This is useful for a global parser which invokes this M
- * routine to read from a file several times as a parent controller. M
- * For exactly this reason, the given file descriptor is NOT closed in the M
- * end. M
- * If error is found in reading the file, ErrStr is set to a string M
- * describing it and ErrLine to line it occured in file relative to begining M
- * of surface. M
- * If no error is detected *ErrStr is set to NULL. M
- * *
- * PARAMETERS: M
- * Handler: A handler to the open stream. M
- * NameWasRead: TRUE if "[SURFACE BSPLINE" hasbeen read, FALSE otherwise. M
- * ErrStr: Will be initialized if an error has occured. M
- * ErrLine: Line number in file FileName of the error, if occured. M
- * *
- * RETURN VALUE: M
- * CagdSrfStruct *: The read surface, or NULL if an error occured. M
- * *
- * KEYWORDS: M
- * BspSrfReadFromFile2, files, read, stream M
- *****************************************************************************/
- CagdSrfStruct *BspSrfReadFromFile2(int Handler,
- CagdBType NameWasRead,
- char **ErrStr,
- int *ErrLine)
- {
- int i, j, k, KVLen, ULength, VLength, UOrder, VOrder, MaxCoord;
- char StringToken[LINE_LEN];
- CagdRType *KnotVector;
- CagdPointType PType;
- IPTokenType Token;
- CagdSrfStruct *NewSrf;
-
- if (!NameWasRead) {
- while ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_EOF &&
- Token != IP_TOKEN_OPEN_PAREN);
-
- /* We found beginning of definition - read one: */
- if (_IPGetToken(Handler, StringToken) != IP_TOKEN_SURFACE ||
- _IPGetToken(Handler, StringToken) != IP_TOKEN_BSPLINE) {
- *ErrStr = "SURFACE BSPLINE key words expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- }
-
- if ((Token = _IPGetToken(Handler, StringToken)) == IP_TOKEN_OPEN_PAREN) {
- if ((*ErrStr = _IPGetSurfaceAttributes(Handler)) != NULL) {
- *ErrStr = "\"[\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- }
- else
- _IPUnGetToken(Handler, StringToken);
-
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OTHER ||
- sscanf(StringToken, "%d", &ULength) != 1 ||
- (Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OTHER ||
- sscanf(StringToken, "%d", &VLength) != 1) {
- *ErrStr = "BSPLINE Number of points expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OTHER ||
- sscanf(StringToken, "%d", &UOrder) != 1 ||
- (Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_OTHER ||
- sscanf(StringToken, "%d", &VOrder) != 1) {
- *ErrStr = "BSPLINE Order expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
-
- Token = _IPGetToken(Handler, StringToken);
- if (!IP_IS_TOKEN_POINT(Token) ||
- strlen(StringToken) != 2 ||
- (StringToken[0] != 'E' && StringToken[0] != 'P') ||
- !isdigit(StringToken[1]) ||
- atoi(&StringToken[1]) > CAGD_MAX_PT_COORD) {
- *ErrStr = "BSPLINE Point type expected";
- *ErrLine = _IPStream[Handler].LineNum;
- return NULL;
- }
- PType = CAGD_MAKE_PT_TYPE(StringToken[0] == 'P', atoi(&StringToken[1]));
-
- NewSrf = BspSrfNew(ULength, VLength, UOrder, VOrder, PType);
-
- /* Read the knot vectors first: */
- for (k = 0; k < 2; k++) {
- int KVPeriodic;
-
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OPEN_PAREN) {
- *ErrStr = "\"[\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_KV) {
- if (Token == IP_TOKEN_KVP) {
- KVPeriodic = TRUE;
- }
- else {
- *ErrStr = "KV expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- }
- else
- KVPeriodic = FALSE;
-
- if (k == 0) {
- NewSrf -> UPeriodic = KVPeriodic;
- if (KVPeriodic) {
- /* Make Knot vector longer. */
- IritFree((VoidPtr) NewSrf -> UKnotVector);
- NewSrf -> UKnotVector =
- (CagdRType *) IritMalloc(sizeof(CagdRType) *
- (NewSrf -> UOrder +
- NewSrf -> ULength +
- NewSrf -> UOrder - 1));
- }
- KnotVector = NewSrf -> UKnotVector;
- KVLen = NewSrf -> UOrder + NewSrf -> ULength +
- (KVPeriodic ? NewSrf -> UOrder - 1 : 0);
- }
- else {
- NewSrf -> VPeriodic = KVPeriodic;
- if (KVPeriodic) {
- /* Make Knot vector longer. */
- IritFree((VoidPtr) NewSrf -> VKnotVector);
- NewSrf -> VKnotVector =
- (CagdRType *) IritMalloc(sizeof(CagdRType) *
- (NewSrf -> VOrder +
- NewSrf -> VLength +
- NewSrf -> VOrder - 1));
- }
- KnotVector = NewSrf -> VKnotVector;
- KVLen = NewSrf -> VOrder + NewSrf -> VLength +
- (KVPeriodic ? NewSrf -> VOrder - 1 : 0);
- }
-
- for (i = 0; i < KVLen; i++) {
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OTHER ||
- sscanf(StringToken, IP_FLOAT_READ, &KnotVector[i]) != 1) {
- *ErrStr = "Numeric data expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- }
-
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_CLOSE_PAREN) {
- *ErrStr = "\"]\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- }
-
- /* Read the points themselves: */
- MaxCoord = CAGD_NUM_OF_PT_COORD(PType);
- for (i = 0; i < ULength * VLength; i++) {
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OPEN_PAREN) {
- *ErrStr = "\"[\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- if (CAGD_IS_RATIONAL_PT(PType)) {
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OTHER ||
- sscanf(StringToken, IP_FLOAT_READ,
- &NewSrf -> Points[0][i]) != 1) {
- *ErrStr = "Numeric data expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- }
- for (j = 1; j <= MaxCoord; j++) {
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_OTHER ||
- sscanf(StringToken, IP_FLOAT_READ,
- &NewSrf -> Points[j][i]) != 1) {
- *ErrStr = "Numeric data expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- }
- if ((Token = _IPGetToken(Handler, StringToken)) !=
- IP_TOKEN_CLOSE_PAREN) {
- *ErrStr = "\"]\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
- }
- if ((Token = _IPGetToken(Handler, StringToken)) != IP_TOKEN_CLOSE_PAREN) {
- *ErrStr = "\"]\" expected";
- *ErrLine = _IPStream[Handler].LineNum;
- CagdSrfFree(NewSrf);
- return NULL;
- }
-
- *ErrStr = NULL;
- *ErrLine = _IPStream[Handler].LineNum;
-
- return NewSrf;
- }
-