1 |
/* $Header$ */
|
2 |
|
3 |
/*
|
4 |
* tclBinary.c --
|
5 |
*
|
6 |
* This file contains the implementation of the "binary" Tcl built-in
|
7 |
* command and the Tcl binary data object.
|
8 |
*
|
9 |
* Copyright (c) 1997 by Sun Microsystems, Inc.
|
10 |
* Copyright (c) 1998-1999 by Scriptics Corporation.
|
11 |
*
|
12 |
* See the file "license.terms" for information on usage and redistribution
|
13 |
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
14 |
*
|
15 |
* RCS: @(#) $Id: tclbinary.c,v 1.1.1.1 2001/06/13 04:33:55 dtashley Exp $
|
16 |
*/
|
17 |
|
18 |
#include <math.h>
|
19 |
#include "tclInt.h"
|
20 |
#include "tclPort.h"
|
21 |
|
22 |
/*
|
23 |
* The following constants are used by GetFormatSpec to indicate various
|
24 |
* special conditions in the parsing of a format specifier.
|
25 |
*/
|
26 |
|
27 |
#define BINARY_ALL -1 /* Use all elements in the argument. */
|
28 |
#define BINARY_NOCOUNT -2 /* No count was specified in format. */
|
29 |
|
30 |
/*
|
31 |
* Prototypes for local procedures defined in this file:
|
32 |
*/
|
33 |
|
34 |
static void DupByteArrayInternalRep _ANSI_ARGS_((Tcl_Obj *srcPtr,
|
35 |
Tcl_Obj *copyPtr));
|
36 |
static int FormatNumber _ANSI_ARGS_((Tcl_Interp *interp, int type,
|
37 |
Tcl_Obj *src, unsigned char **cursorPtr));
|
38 |
static void FreeByteArrayInternalRep _ANSI_ARGS_((Tcl_Obj *objPtr));
|
39 |
static int GetFormatSpec _ANSI_ARGS_((char **formatPtr,
|
40 |
char *cmdPtr, int *countPtr));
|
41 |
static Tcl_Obj * ScanNumber _ANSI_ARGS_((unsigned char *buffer, int type));
|
42 |
static int SetByteArrayFromAny _ANSI_ARGS_((Tcl_Interp *interp,
|
43 |
Tcl_Obj *objPtr));
|
44 |
static void UpdateStringOfByteArray _ANSI_ARGS_((Tcl_Obj *listPtr));
|
45 |
|
46 |
|
47 |
/*
|
48 |
* The following object type represents an array of bytes. An array of
|
49 |
* bytes is not equivalent to an internationalized string. Conceptually, a
|
50 |
* string is an array of 16-bit quantities organized as a sequence of properly
|
51 |
* formed UTF-8 characters, while a ByteArray is an array of 8-bit quantities.
|
52 |
* Accessor functions are provided to convert a ByteArray to a String or a
|
53 |
* String to a ByteArray. Two or more consecutive bytes in an array of bytes
|
54 |
* may look like a single UTF-8 character if the array is casually treated as
|
55 |
* a string. But obtaining the String from a ByteArray is guaranteed to
|
56 |
* produced properly formed UTF-8 sequences so that there is a one-to-one
|
57 |
* map between bytes and characters.
|
58 |
*
|
59 |
* Converting a ByteArray to a String proceeds by casting each byte in the
|
60 |
* array to a 16-bit quantity, treating that number as a Unicode character,
|
61 |
* and storing the UTF-8 version of that Unicode character in the String.
|
62 |
* For ByteArrays consisting entirely of values 1..127, the corresponding
|
63 |
* String representation is the same as the ByteArray representation.
|
64 |
*
|
65 |
* Converting a String to a ByteArray proceeds by getting the Unicode
|
66 |
* representation of each character in the String, casting it to a
|
67 |
* byte by truncating the upper 8 bits, and then storing the byte in the
|
68 |
* ByteArray. Converting from ByteArray to String and back to ByteArray
|
69 |
* is not lossy, but converting an arbitrary String to a ByteArray may be.
|
70 |
*/
|
71 |
|
72 |
Tcl_ObjType tclByteArrayType = {
|
73 |
"bytearray",
|
74 |
FreeByteArrayInternalRep,
|
75 |
DupByteArrayInternalRep,
|
76 |
UpdateStringOfByteArray,
|
77 |
SetByteArrayFromAny
|
78 |
};
|
79 |
|
80 |
/*
|
81 |
* The following structure is the internal rep for a ByteArray object.
|
82 |
* Keeps track of how much memory has been used and how much has been
|
83 |
* allocated for the byte array to enable growing and shrinking of the
|
84 |
* ByteArray object with fewer mallocs.
|
85 |
*/
|
86 |
|
87 |
typedef struct ByteArray {
|
88 |
int used; /* The number of bytes used in the byte
|
89 |
* array. */
|
90 |
int allocated; /* The amount of space actually allocated
|
91 |
* minus 1 byte. */
|
92 |
unsigned char bytes[4]; /* The array of bytes. The actual size of
|
93 |
* this field depends on the 'allocated' field
|
94 |
* above. */
|
95 |
} ByteArray;
|
96 |
|
97 |
#define BYTEARRAY_SIZE(len) \
|
98 |
((unsigned) (sizeof(ByteArray) - 4 + (len)))
|
99 |
#define GET_BYTEARRAY(objPtr) \
|
100 |
((ByteArray *) (objPtr)->internalRep.otherValuePtr)
|
101 |
#define SET_BYTEARRAY(objPtr, baPtr) \
|
102 |
(objPtr)->internalRep.otherValuePtr = (VOID *) (baPtr)
|
103 |
|
104 |
|
105 |
/*
|
106 |
*---------------------------------------------------------------------------
|
107 |
*
|
108 |
* Tcl_NewByteArrayObj --
|
109 |
*
|
110 |
* This procedure is creates a new ByteArray object and initializes
|
111 |
* it from the given array of bytes.
|
112 |
*
|
113 |
* Results:
|
114 |
* The newly create object is returned. This object will have no
|
115 |
* initial string representation. The returned object has a ref count
|
116 |
* of 0.
|
117 |
*
|
118 |
* Side effects:
|
119 |
* Memory allocated for new object and copy of byte array argument.
|
120 |
*
|
121 |
*---------------------------------------------------------------------------
|
122 |
*/
|
123 |
|
124 |
#ifdef TCL_MEM_DEBUG
|
125 |
#undef Tcl_NewByteArrayObj
|
126 |
|
127 |
|
128 |
Tcl_Obj *
|
129 |
Tcl_NewByteArrayObj(bytes, length)
|
130 |
unsigned char *bytes; /* The array of bytes used to initialize
|
131 |
* the new object. */
|
132 |
int length; /* Length of the array of bytes, which must
|
133 |
* be >= 0. */
|
134 |
{
|
135 |
return Tcl_DbNewByteArrayObj(bytes, length, "unknown", 0);
|
136 |
}
|
137 |
|
138 |
#else /* if not TCL_MEM_DEBUG */
|
139 |
|
140 |
Tcl_Obj *
|
141 |
Tcl_NewByteArrayObj(bytes, length)
|
142 |
unsigned char *bytes; /* The array of bytes used to initialize
|
143 |
* the new object. */
|
144 |
int length; /* Length of the array of bytes, which must
|
145 |
* be >= 0. */
|
146 |
{
|
147 |
Tcl_Obj *objPtr;
|
148 |
|
149 |
TclNewObj(objPtr);
|
150 |
Tcl_SetByteArrayObj(objPtr, bytes, length);
|
151 |
return objPtr;
|
152 |
}
|
153 |
#endif /* TCL_MEM_DEBUG */
|
154 |
|
155 |
/*
|
156 |
*---------------------------------------------------------------------------
|
157 |
*
|
158 |
* Tcl_DbNewByteArrayObj --
|
159 |
*
|
160 |
* This procedure is normally called when debugging: i.e., when
|
161 |
* TCL_MEM_DEBUG is defined. It is the same as the Tcl_NewByteArrayObj
|
162 |
* above except that it calls Tcl_DbCkalloc directly with the file name
|
163 |
* and line number from its caller. This simplifies debugging since then
|
164 |
* the checkmem command will report the correct file name and line number
|
165 |
* when reporting objects that haven't been freed.
|
166 |
*
|
167 |
* When TCL_MEM_DEBUG is not defined, this procedure just returns the
|
168 |
* result of calling Tcl_NewByteArrayObj.
|
169 |
*
|
170 |
* Results:
|
171 |
* The newly create object is returned. This object will have no
|
172 |
* initial string representation. The returned object has a ref count
|
173 |
* of 0.
|
174 |
*
|
175 |
* Side effects:
|
176 |
* Memory allocated for new object and copy of byte array argument.
|
177 |
*
|
178 |
*---------------------------------------------------------------------------
|
179 |
*/
|
180 |
|
181 |
#ifdef TCL_MEM_DEBUG
|
182 |
|
183 |
Tcl_Obj *
|
184 |
Tcl_DbNewByteArrayObj(bytes, length, file, line)
|
185 |
unsigned char *bytes; /* The array of bytes used to initialize
|
186 |
* the new object. */
|
187 |
int length; /* Length of the array of bytes, which must
|
188 |
* be >= 0. */
|
189 |
char *file; /* The name of the source file calling this
|
190 |
* procedure; used for debugging. */
|
191 |
int line; /* Line number in the source file; used
|
192 |
* for debugging. */
|
193 |
{
|
194 |
Tcl_Obj *objPtr;
|
195 |
|
196 |
TclDbNewObj(objPtr, file, line);
|
197 |
Tcl_SetByteArrayObj(objPtr, bytes, length);
|
198 |
return objPtr;
|
199 |
}
|
200 |
|
201 |
#else /* if not TCL_MEM_DEBUG */
|
202 |
|
203 |
Tcl_Obj *
|
204 |
Tcl_DbNewByteArrayObj(bytes, length, file, line)
|
205 |
unsigned char *bytes; /* The array of bytes used to initialize
|
206 |
* the new object. */
|
207 |
int length; /* Length of the array of bytes, which must
|
208 |
* be >= 0. */
|
209 |
char *file; /* The name of the source file calling this
|
210 |
* procedure; used for debugging. */
|
211 |
int line; /* Line number in the source file; used
|
212 |
* for debugging. */
|
213 |
{
|
214 |
return Tcl_NewByteArrayObj(bytes, length);
|
215 |
}
|
216 |
#endif /* TCL_MEM_DEBUG */
|
217 |
|
218 |
/*
|
219 |
*---------------------------------------------------------------------------
|
220 |
*
|
221 |
* Tcl_SetByteArrayObj --
|
222 |
*
|
223 |
* Modify an object to be a ByteArray object and to have the specified
|
224 |
* array of bytes as its value.
|
225 |
*
|
226 |
* Results:
|
227 |
* None.
|
228 |
*
|
229 |
* Side effects:
|
230 |
* The object's old string rep and internal rep is freed.
|
231 |
* Memory allocated for copy of byte array argument.
|
232 |
*
|
233 |
*----------------------------------------------------------------------
|
234 |
*/
|
235 |
|
236 |
void
|
237 |
Tcl_SetByteArrayObj(objPtr, bytes, length)
|
238 |
Tcl_Obj *objPtr; /* Object to initialize as a ByteArray. */
|
239 |
unsigned char *bytes; /* The array of bytes to use as the new
|
240 |
* value. */
|
241 |
int length; /* Length of the array of bytes, which must
|
242 |
* be >= 0. */
|
243 |
{
|
244 |
Tcl_ObjType *typePtr;
|
245 |
ByteArray *byteArrayPtr;
|
246 |
|
247 |
if (Tcl_IsShared(objPtr)) {
|
248 |
panic("Tcl_SetByteArrayObj called with shared object");
|
249 |
}
|
250 |
typePtr = objPtr->typePtr;
|
251 |
if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
|
252 |
(*typePtr->freeIntRepProc)(objPtr);
|
253 |
}
|
254 |
Tcl_InvalidateStringRep(objPtr);
|
255 |
|
256 |
byteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
|
257 |
byteArrayPtr->used = length;
|
258 |
byteArrayPtr->allocated = length;
|
259 |
memcpy((VOID *) byteArrayPtr->bytes, (VOID *) bytes, (size_t) length);
|
260 |
|
261 |
objPtr->typePtr = &tclByteArrayType;
|
262 |
SET_BYTEARRAY(objPtr, byteArrayPtr);
|
263 |
}
|
264 |
|
265 |
/*
|
266 |
*----------------------------------------------------------------------
|
267 |
*
|
268 |
* Tcl_GetByteArrayFromObj --
|
269 |
*
|
270 |
* Attempt to get the array of bytes from the Tcl object. If the
|
271 |
* object is not already a ByteArray object, an attempt will be
|
272 |
* made to convert it to one.
|
273 |
*
|
274 |
* Results:
|
275 |
* Pointer to array of bytes representing the ByteArray object.
|
276 |
*
|
277 |
* Side effects:
|
278 |
* Frees old internal rep. Allocates memory for new internal rep.
|
279 |
*
|
280 |
*----------------------------------------------------------------------
|
281 |
*/
|
282 |
|
283 |
unsigned char *
|
284 |
Tcl_GetByteArrayFromObj(objPtr, lengthPtr)
|
285 |
Tcl_Obj *objPtr; /* The ByteArray object. */
|
286 |
int *lengthPtr; /* If non-NULL, filled with length of the
|
287 |
* array of bytes in the ByteArray object. */
|
288 |
{
|
289 |
ByteArray *baPtr;
|
290 |
|
291 |
SetByteArrayFromAny(NULL, objPtr);
|
292 |
baPtr = GET_BYTEARRAY(objPtr);
|
293 |
|
294 |
if (lengthPtr != NULL) {
|
295 |
*lengthPtr = baPtr->used;
|
296 |
}
|
297 |
return (unsigned char *) baPtr->bytes;
|
298 |
}
|
299 |
|
300 |
/*
|
301 |
*----------------------------------------------------------------------
|
302 |
*
|
303 |
* Tcl_SetByteArrayLength --
|
304 |
*
|
305 |
* This procedure changes the length of the byte array for this
|
306 |
* object. Once the caller has set the length of the array, it
|
307 |
* is acceptable to directly modify the bytes in the array up until
|
308 |
* Tcl_GetStringFromObj() has been called on this object.
|
309 |
*
|
310 |
* Results:
|
311 |
* The new byte array of the specified length.
|
312 |
*
|
313 |
* Side effects:
|
314 |
* Allocates enough memory for an array of bytes of the requested
|
315 |
* size. When growing the array, the old array is copied to the
|
316 |
* new array; new bytes are undefined. When shrinking, the
|
317 |
* old array is truncated to the specified length.
|
318 |
*
|
319 |
*---------------------------------------------------------------------------
|
320 |
*/
|
321 |
|
322 |
unsigned char *
|
323 |
Tcl_SetByteArrayLength(objPtr, length)
|
324 |
Tcl_Obj *objPtr; /* The ByteArray object. */
|
325 |
int length; /* New length for internal byte array. */
|
326 |
{
|
327 |
ByteArray *byteArrayPtr, *newByteArrayPtr;
|
328 |
|
329 |
if (Tcl_IsShared(objPtr)) {
|
330 |
panic("Tcl_SetObjLength called with shared object");
|
331 |
}
|
332 |
if (objPtr->typePtr != &tclByteArrayType) {
|
333 |
SetByteArrayFromAny(NULL, objPtr);
|
334 |
}
|
335 |
|
336 |
byteArrayPtr = GET_BYTEARRAY(objPtr);
|
337 |
if (length > byteArrayPtr->allocated) {
|
338 |
newByteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
|
339 |
newByteArrayPtr->used = length;
|
340 |
newByteArrayPtr->allocated = length;
|
341 |
memcpy((VOID *) newByteArrayPtr->bytes,
|
342 |
(VOID *) byteArrayPtr->bytes, (size_t) byteArrayPtr->used);
|
343 |
ckfree((char *) byteArrayPtr);
|
344 |
byteArrayPtr = newByteArrayPtr;
|
345 |
SET_BYTEARRAY(objPtr, byteArrayPtr);
|
346 |
}
|
347 |
Tcl_InvalidateStringRep(objPtr);
|
348 |
byteArrayPtr->used = length;
|
349 |
return byteArrayPtr->bytes;
|
350 |
}
|
351 |
|
352 |
/*
|
353 |
*---------------------------------------------------------------------------
|
354 |
*
|
355 |
* SetByteArrayFromAny --
|
356 |
*
|
357 |
* Generate the ByteArray internal rep from the string rep.
|
358 |
*
|
359 |
* Results:
|
360 |
* The return value is always TCL_OK.
|
361 |
*
|
362 |
* Side effects:
|
363 |
* A ByteArray object is stored as the internal rep of objPtr.
|
364 |
*
|
365 |
*---------------------------------------------------------------------------
|
366 |
*/
|
367 |
|
368 |
static int
|
369 |
SetByteArrayFromAny(interp, objPtr)
|
370 |
Tcl_Interp *interp; /* Not used. */
|
371 |
Tcl_Obj *objPtr; /* The object to convert to type ByteArray. */
|
372 |
{
|
373 |
Tcl_ObjType *typePtr;
|
374 |
int length;
|
375 |
char *src, *srcEnd;
|
376 |
unsigned char *dst;
|
377 |
ByteArray *byteArrayPtr;
|
378 |
Tcl_UniChar ch;
|
379 |
|
380 |
typePtr = objPtr->typePtr;
|
381 |
if (typePtr != &tclByteArrayType) {
|
382 |
src = Tcl_GetStringFromObj(objPtr, &length);
|
383 |
srcEnd = src + length;
|
384 |
|
385 |
byteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
|
386 |
for (dst = byteArrayPtr->bytes; src < srcEnd; ) {
|
387 |
src += Tcl_UtfToUniChar(src, &ch);
|
388 |
*dst++ = (unsigned char) ch;
|
389 |
}
|
390 |
|
391 |
byteArrayPtr->used = dst - byteArrayPtr->bytes;
|
392 |
byteArrayPtr->allocated = length;
|
393 |
|
394 |
if ((typePtr != NULL) && (typePtr->freeIntRepProc) != NULL) {
|
395 |
(*typePtr->freeIntRepProc)(objPtr);
|
396 |
}
|
397 |
objPtr->typePtr = &tclByteArrayType;
|
398 |
SET_BYTEARRAY(objPtr, byteArrayPtr);
|
399 |
}
|
400 |
return TCL_OK;
|
401 |
}
|
402 |
|
403 |
/*
|
404 |
*----------------------------------------------------------------------
|
405 |
*
|
406 |
* FreeByteArrayInternalRep --
|
407 |
*
|
408 |
* Deallocate the storage associated with a ByteArray data object's
|
409 |
* internal representation.
|
410 |
*
|
411 |
* Results:
|
412 |
* None.
|
413 |
*
|
414 |
* Side effects:
|
415 |
* Frees memory.
|
416 |
*
|
417 |
*----------------------------------------------------------------------
|
418 |
*/
|
419 |
|
420 |
static void
|
421 |
FreeByteArrayInternalRep(objPtr)
|
422 |
Tcl_Obj *objPtr; /* Object with internal rep to free. */
|
423 |
{
|
424 |
ckfree((char *) GET_BYTEARRAY(objPtr));
|
425 |
}
|
426 |
|
427 |
/*
|
428 |
*---------------------------------------------------------------------------
|
429 |
*
|
430 |
* DupByteArrayInternalRep --
|
431 |
*
|
432 |
* Initialize the internal representation of a ByteArray Tcl_Obj
|
433 |
* to a copy of the internal representation of an existing ByteArray
|
434 |
* object.
|
435 |
*
|
436 |
* Results:
|
437 |
* None.
|
438 |
*
|
439 |
* Side effects:
|
440 |
* Allocates memory.
|
441 |
*
|
442 |
*---------------------------------------------------------------------------
|
443 |
*/
|
444 |
|
445 |
static void
|
446 |
DupByteArrayInternalRep(srcPtr, copyPtr)
|
447 |
Tcl_Obj *srcPtr; /* Object with internal rep to copy. */
|
448 |
Tcl_Obj *copyPtr; /* Object with internal rep to set. */
|
449 |
{
|
450 |
int length;
|
451 |
ByteArray *srcArrayPtr, *copyArrayPtr;
|
452 |
|
453 |
srcArrayPtr = GET_BYTEARRAY(srcPtr);
|
454 |
length = srcArrayPtr->used;
|
455 |
|
456 |
copyArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
|
457 |
copyArrayPtr->used = length;
|
458 |
copyArrayPtr->allocated = length;
|
459 |
memcpy((VOID *) copyArrayPtr->bytes, (VOID *) srcArrayPtr->bytes,
|
460 |
(size_t) length);
|
461 |
SET_BYTEARRAY(copyPtr, copyArrayPtr);
|
462 |
|
463 |
copyPtr->typePtr = &tclByteArrayType;
|
464 |
}
|
465 |
|
466 |
/*
|
467 |
*---------------------------------------------------------------------------
|
468 |
*
|
469 |
* UpdateStringOfByteArray --
|
470 |
*
|
471 |
* Update the string representation for a ByteArray data object.
|
472 |
* Note: This procedure does not invalidate an existing old string rep
|
473 |
* so storage will be lost if this has not already been done.
|
474 |
*
|
475 |
* Results:
|
476 |
* None.
|
477 |
*
|
478 |
* Side effects:
|
479 |
* The object's string is set to a valid string that results from
|
480 |
* the ByteArray-to-string conversion.
|
481 |
*
|
482 |
* The object becomes a string object -- the internal rep is
|
483 |
* discarded and the typePtr becomes NULL.
|
484 |
*
|
485 |
*---------------------------------------------------------------------------
|
486 |
*/
|
487 |
|
488 |
static void
|
489 |
UpdateStringOfByteArray(objPtr)
|
490 |
Tcl_Obj *objPtr; /* ByteArray object whose string rep to
|
491 |
* update. */
|
492 |
{
|
493 |
int i, length, size;
|
494 |
unsigned char *src;
|
495 |
char *dst;
|
496 |
ByteArray *byteArrayPtr;
|
497 |
|
498 |
byteArrayPtr = GET_BYTEARRAY(objPtr);
|
499 |
src = byteArrayPtr->bytes;
|
500 |
length = byteArrayPtr->used;
|
501 |
|
502 |
/*
|
503 |
* How much space will string rep need?
|
504 |
*/
|
505 |
|
506 |
size = length;
|
507 |
for (i = 0; i < length; i++) {
|
508 |
if ((src[i] == 0) || (src[i] > 127)) {
|
509 |
size++;
|
510 |
}
|
511 |
}
|
512 |
|
513 |
dst = (char *) ckalloc((unsigned) (size + 1));
|
514 |
objPtr->bytes = dst;
|
515 |
objPtr->length = size;
|
516 |
|
517 |
if (size == length) {
|
518 |
memcpy((VOID *) dst, (VOID *) src, (size_t) size);
|
519 |
dst[size] = '\0';
|
520 |
} else {
|
521 |
for (i = 0; i < length; i++) {
|
522 |
dst += Tcl_UniCharToUtf(src[i], dst);
|
523 |
}
|
524 |
*dst = '\0';
|
525 |
}
|
526 |
}
|
527 |
|
528 |
/*
|
529 |
*----------------------------------------------------------------------
|
530 |
*
|
531 |
* Tcl_BinaryObjCmd --
|
532 |
*
|
533 |
* This procedure implements the "binary" Tcl command.
|
534 |
*
|
535 |
* Results:
|
536 |
* A standard Tcl result.
|
537 |
*
|
538 |
* Side effects:
|
539 |
* See the user documentation.
|
540 |
*
|
541 |
*----------------------------------------------------------------------
|
542 |
*/
|
543 |
|
544 |
int
|
545 |
Tcl_BinaryObjCmd(dummy, interp, objc, objv)
|
546 |
ClientData dummy; /* Not used. */
|
547 |
Tcl_Interp *interp; /* Current interpreter. */
|
548 |
int objc; /* Number of arguments. */
|
549 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
550 |
{
|
551 |
int arg; /* Index of next argument to consume. */
|
552 |
int value = 0; /* Current integer value to be packed.
|
553 |
* Initialized to avoid compiler warning. */
|
554 |
char cmd; /* Current format character. */
|
555 |
int count; /* Count associated with current format
|
556 |
* character. */
|
557 |
char *format; /* Pointer to current position in format
|
558 |
* string. */
|
559 |
Tcl_Obj *resultPtr; /* Object holding result buffer. */
|
560 |
unsigned char *buffer; /* Start of result buffer. */
|
561 |
unsigned char *cursor; /* Current position within result buffer. */
|
562 |
unsigned char *maxPos; /* Greatest position within result buffer that
|
563 |
* cursor has visited.*/
|
564 |
char *errorString, *errorValue, *str;
|
565 |
int offset, size, length, index;
|
566 |
static char *options[] = {
|
567 |
"format", "scan", NULL
|
568 |
};
|
569 |
enum options {
|
570 |
BINARY_FORMAT, BINARY_SCAN
|
571 |
};
|
572 |
|
573 |
if (objc < 2) {
|
574 |
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
|
575 |
return TCL_ERROR;
|
576 |
}
|
577 |
|
578 |
if (Tcl_GetIndexFromObj(interp, objv[1], options, "option", 0,
|
579 |
&index) != TCL_OK) {
|
580 |
return TCL_ERROR;
|
581 |
}
|
582 |
|
583 |
switch ((enum options) index) {
|
584 |
case BINARY_FORMAT: {
|
585 |
if (objc < 3) {
|
586 |
Tcl_WrongNumArgs(interp, 2, objv, "formatString ?arg arg ...?");
|
587 |
return TCL_ERROR;
|
588 |
}
|
589 |
|
590 |
/*
|
591 |
* To avoid copying the data, we format the string in two passes.
|
592 |
* The first pass computes the size of the output buffer. The
|
593 |
* second pass places the formatted data into the buffer.
|
594 |
*/
|
595 |
|
596 |
format = Tcl_GetString(objv[2]);
|
597 |
arg = 3;
|
598 |
offset = 0;
|
599 |
length = 0;
|
600 |
while (*format != '\0') {
|
601 |
str = format;
|
602 |
if (!GetFormatSpec(&format, &cmd, &count)) {
|
603 |
break;
|
604 |
}
|
605 |
switch (cmd) {
|
606 |
case 'a':
|
607 |
case 'A':
|
608 |
case 'b':
|
609 |
case 'B':
|
610 |
case 'h':
|
611 |
case 'H': {
|
612 |
/*
|
613 |
* For string-type specifiers, the count corresponds
|
614 |
* to the number of bytes in a single argument.
|
615 |
*/
|
616 |
|
617 |
if (arg >= objc) {
|
618 |
goto badIndex;
|
619 |
}
|
620 |
if (count == BINARY_ALL) {
|
621 |
Tcl_GetByteArrayFromObj(objv[arg], &count);
|
622 |
} else if (count == BINARY_NOCOUNT) {
|
623 |
count = 1;
|
624 |
}
|
625 |
arg++;
|
626 |
if (cmd == 'a' || cmd == 'A') {
|
627 |
offset += count;
|
628 |
} else if (cmd == 'b' || cmd == 'B') {
|
629 |
offset += (count + 7) / 8;
|
630 |
} else {
|
631 |
offset += (count + 1) / 2;
|
632 |
}
|
633 |
break;
|
634 |
}
|
635 |
case 'c': {
|
636 |
size = 1;
|
637 |
goto doNumbers;
|
638 |
}
|
639 |
case 's':
|
640 |
case 'S': {
|
641 |
size = 2;
|
642 |
goto doNumbers;
|
643 |
}
|
644 |
case 'i':
|
645 |
case 'I': {
|
646 |
size = 4;
|
647 |
goto doNumbers;
|
648 |
}
|
649 |
case 'f': {
|
650 |
size = sizeof(float);
|
651 |
goto doNumbers;
|
652 |
}
|
653 |
case 'd': {
|
654 |
size = sizeof(double);
|
655 |
|
656 |
doNumbers:
|
657 |
if (arg >= objc) {
|
658 |
goto badIndex;
|
659 |
}
|
660 |
|
661 |
/*
|
662 |
* For number-type specifiers, the count corresponds
|
663 |
* to the number of elements in the list stored in
|
664 |
* a single argument. If no count is specified, then
|
665 |
* the argument is taken as a single non-list value.
|
666 |
*/
|
667 |
|
668 |
if (count == BINARY_NOCOUNT) {
|
669 |
arg++;
|
670 |
count = 1;
|
671 |
} else {
|
672 |
int listc;
|
673 |
Tcl_Obj **listv;
|
674 |
if (Tcl_ListObjGetElements(interp, objv[arg++],
|
675 |
&listc, &listv) != TCL_OK) {
|
676 |
return TCL_ERROR;
|
677 |
}
|
678 |
if (count == BINARY_ALL) {
|
679 |
count = listc;
|
680 |
} else if (count > listc) {
|
681 |
Tcl_AppendResult(interp,
|
682 |
"number of elements in list does not match count",
|
683 |
(char *) NULL);
|
684 |
return TCL_ERROR;
|
685 |
}
|
686 |
}
|
687 |
offset += count*size;
|
688 |
break;
|
689 |
}
|
690 |
case 'x': {
|
691 |
if (count == BINARY_ALL) {
|
692 |
Tcl_AppendResult(interp,
|
693 |
"cannot use \"*\" in format string with \"x\"",
|
694 |
(char *) NULL);
|
695 |
return TCL_ERROR;
|
696 |
} else if (count == BINARY_NOCOUNT) {
|
697 |
count = 1;
|
698 |
}
|
699 |
offset += count;
|
700 |
break;
|
701 |
}
|
702 |
case 'X': {
|
703 |
if (count == BINARY_NOCOUNT) {
|
704 |
count = 1;
|
705 |
}
|
706 |
if ((count > offset) || (count == BINARY_ALL)) {
|
707 |
count = offset;
|
708 |
}
|
709 |
if (offset > length) {
|
710 |
length = offset;
|
711 |
}
|
712 |
offset -= count;
|
713 |
break;
|
714 |
}
|
715 |
case '@': {
|
716 |
if (offset > length) {
|
717 |
length = offset;
|
718 |
}
|
719 |
if (count == BINARY_ALL) {
|
720 |
offset = length;
|
721 |
} else if (count == BINARY_NOCOUNT) {
|
722 |
goto badCount;
|
723 |
} else {
|
724 |
offset = count;
|
725 |
}
|
726 |
break;
|
727 |
}
|
728 |
default: {
|
729 |
errorString = str;
|
730 |
goto badfield;
|
731 |
}
|
732 |
}
|
733 |
}
|
734 |
if (offset > length) {
|
735 |
length = offset;
|
736 |
}
|
737 |
if (length == 0) {
|
738 |
return TCL_OK;
|
739 |
}
|
740 |
|
741 |
/*
|
742 |
* Prepare the result object by preallocating the caclulated
|
743 |
* number of bytes and filling with nulls.
|
744 |
*/
|
745 |
|
746 |
resultPtr = Tcl_GetObjResult(interp);
|
747 |
buffer = Tcl_SetByteArrayLength(resultPtr, length);
|
748 |
memset((VOID *) buffer, 0, (size_t) length);
|
749 |
|
750 |
/*
|
751 |
* Pack the data into the result object. Note that we can skip
|
752 |
* the error checking during this pass, since we have already
|
753 |
* parsed the string once.
|
754 |
*/
|
755 |
|
756 |
arg = 3;
|
757 |
format = Tcl_GetString(objv[2]);
|
758 |
cursor = buffer;
|
759 |
maxPos = cursor;
|
760 |
while (*format != 0) {
|
761 |
if (!GetFormatSpec(&format, &cmd, &count)) {
|
762 |
break;
|
763 |
}
|
764 |
if ((count == 0) && (cmd != '@')) {
|
765 |
arg++;
|
766 |
continue;
|
767 |
}
|
768 |
switch (cmd) {
|
769 |
case 'a':
|
770 |
case 'A': {
|
771 |
char pad = (char) (cmd == 'a' ? '\0' : ' ');
|
772 |
unsigned char *bytes;
|
773 |
|
774 |
bytes = Tcl_GetByteArrayFromObj(objv[arg++], &length);
|
775 |
|
776 |
if (count == BINARY_ALL) {
|
777 |
count = length;
|
778 |
} else if (count == BINARY_NOCOUNT) {
|
779 |
count = 1;
|
780 |
}
|
781 |
if (length >= count) {
|
782 |
memcpy((VOID *) cursor, (VOID *) bytes,
|
783 |
(size_t) count);
|
784 |
} else {
|
785 |
memcpy((VOID *) cursor, (VOID *) bytes,
|
786 |
(size_t) length);
|
787 |
memset((VOID *) (cursor + length), pad,
|
788 |
(size_t) (count - length));
|
789 |
}
|
790 |
cursor += count;
|
791 |
break;
|
792 |
}
|
793 |
case 'b':
|
794 |
case 'B': {
|
795 |
unsigned char *last;
|
796 |
|
797 |
str = Tcl_GetStringFromObj(objv[arg++], &length);
|
798 |
if (count == BINARY_ALL) {
|
799 |
count = length;
|
800 |
} else if (count == BINARY_NOCOUNT) {
|
801 |
count = 1;
|
802 |
}
|
803 |
last = cursor + ((count + 7) / 8);
|
804 |
if (count > length) {
|
805 |
count = length;
|
806 |
}
|
807 |
value = 0;
|
808 |
errorString = "binary";
|
809 |
if (cmd == 'B') {
|
810 |
for (offset = 0; offset < count; offset++) {
|
811 |
value <<= 1;
|
812 |
if (str[offset] == '1') {
|
813 |
value |= 1;
|
814 |
} else if (str[offset] != '0') {
|
815 |
errorValue = str;
|
816 |
goto badValue;
|
817 |
}
|
818 |
if (((offset + 1) % 8) == 0) {
|
819 |
*cursor++ = (unsigned char) value;
|
820 |
value = 0;
|
821 |
}
|
822 |
}
|
823 |
} else {
|
824 |
for (offset = 0; offset < count; offset++) {
|
825 |
value >>= 1;
|
826 |
if (str[offset] == '1') {
|
827 |
value |= 128;
|
828 |
} else if (str[offset] != '0') {
|
829 |
errorValue = str;
|
830 |
goto badValue;
|
831 |
}
|
832 |
if (!((offset + 1) % 8)) {
|
833 |
*cursor++ = (unsigned char) value;
|
834 |
value = 0;
|
835 |
}
|
836 |
}
|
837 |
}
|
838 |
if ((offset % 8) != 0) {
|
839 |
if (cmd == 'B') {
|
840 |
value <<= 8 - (offset % 8);
|
841 |
} else {
|
842 |
value >>= 8 - (offset % 8);
|
843 |
}
|
844 |
*cursor++ = (unsigned char) value;
|
845 |
}
|
846 |
while (cursor < last) {
|
847 |
*cursor++ = '\0';
|
848 |
}
|
849 |
break;
|
850 |
}
|
851 |
case 'h':
|
852 |
case 'H': {
|
853 |
unsigned char *last;
|
854 |
int c;
|
855 |
|
856 |
str = Tcl_GetStringFromObj(objv[arg++], &length);
|
857 |
if (count == BINARY_ALL) {
|
858 |
count = length;
|
859 |
} else if (count == BINARY_NOCOUNT) {
|
860 |
count = 1;
|
861 |
}
|
862 |
last = cursor + ((count + 1) / 2);
|
863 |
if (count > length) {
|
864 |
count = length;
|
865 |
}
|
866 |
value = 0;
|
867 |
errorString = "hexadecimal";
|
868 |
if (cmd == 'H') {
|
869 |
for (offset = 0; offset < count; offset++) {
|
870 |
value <<= 4;
|
871 |
if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */
|
872 |
errorValue = str;
|
873 |
goto badValue;
|
874 |
}
|
875 |
c = str[offset] - '0';
|
876 |
if (c > 9) {
|
877 |
c += ('0' - 'A') + 10;
|
878 |
}
|
879 |
if (c > 16) {
|
880 |
c += ('A' - 'a');
|
881 |
}
|
882 |
value |= (c & 0xf);
|
883 |
if (offset % 2) {
|
884 |
*cursor++ = (char) value;
|
885 |
value = 0;
|
886 |
}
|
887 |
}
|
888 |
} else {
|
889 |
for (offset = 0; offset < count; offset++) {
|
890 |
value >>= 4;
|
891 |
|
892 |
if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */
|
893 |
errorValue = str;
|
894 |
goto badValue;
|
895 |
}
|
896 |
c = str[offset] - '0';
|
897 |
if (c > 9) {
|
898 |
c += ('0' - 'A') + 10;
|
899 |
}
|
900 |
if (c > 16) {
|
901 |
c += ('A' - 'a');
|
902 |
}
|
903 |
value |= ((c << 4) & 0xf0);
|
904 |
if (offset % 2) {
|
905 |
*cursor++ = (unsigned char)(value & 0xff);
|
906 |
value = 0;
|
907 |
}
|
908 |
}
|
909 |
}
|
910 |
if (offset % 2) {
|
911 |
if (cmd == 'H') {
|
912 |
value <<= 4;
|
913 |
} else {
|
914 |
value >>= 4;
|
915 |
}
|
916 |
*cursor++ = (unsigned char) value;
|
917 |
}
|
918 |
|
919 |
while (cursor < last) {
|
920 |
*cursor++ = '\0';
|
921 |
}
|
922 |
break;
|
923 |
}
|
924 |
case 'c':
|
925 |
case 's':
|
926 |
case 'S':
|
927 |
case 'i':
|
928 |
case 'I':
|
929 |
case 'd':
|
930 |
case 'f': {
|
931 |
int listc, i;
|
932 |
Tcl_Obj **listv;
|
933 |
|
934 |
if (count == BINARY_NOCOUNT) {
|
935 |
/*
|
936 |
* Note that we are casting away the const-ness of
|
937 |
* objv, but this is safe since we aren't going to
|
938 |
* modify the array.
|
939 |
*/
|
940 |
|
941 |
listv = (Tcl_Obj**)(objv + arg);
|
942 |
listc = 1;
|
943 |
count = 1;
|
944 |
} else {
|
945 |
Tcl_ListObjGetElements(interp, objv[arg],
|
946 |
&listc, &listv);
|
947 |
if (count == BINARY_ALL) {
|
948 |
count = listc;
|
949 |
}
|
950 |
}
|
951 |
arg++;
|
952 |
for (i = 0; i < count; i++) {
|
953 |
if (FormatNumber(interp, cmd, listv[i], &cursor)
|
954 |
!= TCL_OK) {
|
955 |
return TCL_ERROR;
|
956 |
}
|
957 |
}
|
958 |
break;
|
959 |
}
|
960 |
case 'x': {
|
961 |
if (count == BINARY_NOCOUNT) {
|
962 |
count = 1;
|
963 |
}
|
964 |
memset(cursor, 0, (size_t) count);
|
965 |
cursor += count;
|
966 |
break;
|
967 |
}
|
968 |
case 'X': {
|
969 |
if (cursor > maxPos) {
|
970 |
maxPos = cursor;
|
971 |
}
|
972 |
if (count == BINARY_NOCOUNT) {
|
973 |
count = 1;
|
974 |
}
|
975 |
if ((count == BINARY_ALL)
|
976 |
|| (count > (cursor - buffer))) {
|
977 |
cursor = buffer;
|
978 |
} else {
|
979 |
cursor -= count;
|
980 |
}
|
981 |
break;
|
982 |
}
|
983 |
case '@': {
|
984 |
if (cursor > maxPos) {
|
985 |
maxPos = cursor;
|
986 |
}
|
987 |
if (count == BINARY_ALL) {
|
988 |
cursor = maxPos;
|
989 |
} else {
|
990 |
cursor = buffer + count;
|
991 |
}
|
992 |
break;
|
993 |
}
|
994 |
}
|
995 |
}
|
996 |
break;
|
997 |
}
|
998 |
case BINARY_SCAN: {
|
999 |
int i;
|
1000 |
Tcl_Obj *valuePtr, *elementPtr;
|
1001 |
|
1002 |
if (objc < 4) {
|
1003 |
Tcl_WrongNumArgs(interp, 2, objv,
|
1004 |
"value formatString ?varName varName ...?");
|
1005 |
return TCL_ERROR;
|
1006 |
}
|
1007 |
buffer = Tcl_GetByteArrayFromObj(objv[2], &length);
|
1008 |
format = Tcl_GetString(objv[3]);
|
1009 |
cursor = buffer;
|
1010 |
arg = 4;
|
1011 |
offset = 0;
|
1012 |
while (*format != '\0') {
|
1013 |
str = format;
|
1014 |
if (!GetFormatSpec(&format, &cmd, &count)) {
|
1015 |
goto done;
|
1016 |
}
|
1017 |
switch (cmd) {
|
1018 |
case 'a':
|
1019 |
case 'A': {
|
1020 |
unsigned char *src;
|
1021 |
|
1022 |
if (arg >= objc) {
|
1023 |
goto badIndex;
|
1024 |
}
|
1025 |
if (count == BINARY_ALL) {
|
1026 |
count = length - offset;
|
1027 |
} else {
|
1028 |
if (count == BINARY_NOCOUNT) {
|
1029 |
count = 1;
|
1030 |
}
|
1031 |
if (count > (length - offset)) {
|
1032 |
goto done;
|
1033 |
}
|
1034 |
}
|
1035 |
|
1036 |
src = buffer + offset;
|
1037 |
size = count;
|
1038 |
|
1039 |
/*
|
1040 |
* Trim trailing nulls and spaces, if necessary.
|
1041 |
*/
|
1042 |
|
1043 |
if (cmd == 'A') {
|
1044 |
while (size > 0) {
|
1045 |
if (src[size-1] != '\0' && src[size-1] != ' ') {
|
1046 |
break;
|
1047 |
}
|
1048 |
size--;
|
1049 |
}
|
1050 |
}
|
1051 |
valuePtr = Tcl_NewByteArrayObj(src, size);
|
1052 |
resultPtr = Tcl_ObjSetVar2(interp, objv[arg],
|
1053 |
NULL, valuePtr, TCL_LEAVE_ERR_MSG);
|
1054 |
arg++;
|
1055 |
if (resultPtr == NULL) {
|
1056 |
Tcl_DecrRefCount(valuePtr); /* unneeded */
|
1057 |
return TCL_ERROR;
|
1058 |
}
|
1059 |
offset += count;
|
1060 |
break;
|
1061 |
}
|
1062 |
case 'b':
|
1063 |
case 'B': {
|
1064 |
unsigned char *src;
|
1065 |
char *dest;
|
1066 |
|
1067 |
if (arg >= objc) {
|
1068 |
goto badIndex;
|
1069 |
}
|
1070 |
if (count == BINARY_ALL) {
|
1071 |
count = (length - offset) * 8;
|
1072 |
} else {
|
1073 |
if (count == BINARY_NOCOUNT) {
|
1074 |
count = 1;
|
1075 |
}
|
1076 |
if (count > (length - offset) * 8) {
|
1077 |
goto done;
|
1078 |
}
|
1079 |
}
|
1080 |
src = buffer + offset;
|
1081 |
valuePtr = Tcl_NewObj();
|
1082 |
Tcl_SetObjLength(valuePtr, count);
|
1083 |
dest = Tcl_GetString(valuePtr);
|
1084 |
|
1085 |
if (cmd == 'b') {
|
1086 |
for (i = 0; i < count; i++) {
|
1087 |
if (i % 8) {
|
1088 |
value >>= 1;
|
1089 |
} else {
|
1090 |
value = *src++;
|
1091 |
}
|
1092 |
*dest++ = (char) ((value & 1) ? '1' : '0');
|
1093 |
}
|
1094 |
} else {
|
1095 |
for (i = 0; i < count; i++) {
|
1096 |
if (i % 8) {
|
1097 |
value <<= 1;
|
1098 |
} else {
|
1099 |
value = *src++;
|
1100 |
}
|
1101 |
*dest++ = (char) ((value & 0x80) ? '1' : '0');
|
1102 |
}
|
1103 |
}
|
1104 |
|
1105 |
resultPtr = Tcl_ObjSetVar2(interp, objv[arg],
|
1106 |
NULL, valuePtr, TCL_LEAVE_ERR_MSG);
|
1107 |
arg++;
|
1108 |
if (resultPtr == NULL) {
|
1109 |
Tcl_DecrRefCount(valuePtr); /* unneeded */
|
1110 |
return TCL_ERROR;
|
1111 |
}
|
1112 |
offset += (count + 7 ) / 8;
|
1113 |
break;
|
1114 |
}
|
1115 |
case 'h':
|
1116 |
case 'H': {
|
1117 |
char *dest;
|
1118 |
unsigned char *src;
|
1119 |
int i;
|
1120 |
static char hexdigit[] = "0123456789abcdef";
|
1121 |
|
1122 |
if (arg >= objc) {
|
1123 |
goto badIndex;
|
1124 |
}
|
1125 |
if (count == BINARY_ALL) {
|
1126 |
count = (length - offset)*2;
|
1127 |
} else {
|
1128 |
if (count == BINARY_NOCOUNT) {
|
1129 |
count = 1;
|
1130 |
}
|
1131 |
if (count > (length - offset)*2) {
|
1132 |
goto done;
|
1133 |
}
|
1134 |
}
|
1135 |
src = buffer + offset;
|
1136 |
valuePtr = Tcl_NewObj();
|
1137 |
Tcl_SetObjLength(valuePtr, count);
|
1138 |
dest = Tcl_GetString(valuePtr);
|
1139 |
|
1140 |
if (cmd == 'h') {
|
1141 |
for (i = 0; i < count; i++) {
|
1142 |
if (i % 2) {
|
1143 |
value >>= 4;
|
1144 |
} else {
|
1145 |
value = *src++;
|
1146 |
}
|
1147 |
*dest++ = hexdigit[value & 0xf];
|
1148 |
}
|
1149 |
} else {
|
1150 |
for (i = 0; i < count; i++) {
|
1151 |
if (i % 2) {
|
1152 |
value <<= 4;
|
1153 |
} else {
|
1154 |
value = *src++;
|
1155 |
}
|
1156 |
*dest++ = hexdigit[(value >> 4) & 0xf];
|
1157 |
}
|
1158 |
}
|
1159 |
|
1160 |
resultPtr = Tcl_ObjSetVar2(interp, objv[arg],
|
1161 |
NULL, valuePtr, TCL_LEAVE_ERR_MSG);
|
1162 |
arg++;
|
1163 |
if (resultPtr == NULL) {
|
1164 |
Tcl_DecrRefCount(valuePtr); /* unneeded */
|
1165 |
return TCL_ERROR;
|
1166 |
}
|
1167 |
offset += (count + 1) / 2;
|
1168 |
break;
|
1169 |
}
|
1170 |
case 'c': {
|
1171 |
size = 1;
|
1172 |
goto scanNumber;
|
1173 |
}
|
1174 |
case 's':
|
1175 |
case 'S': {
|
1176 |
size = 2;
|
1177 |
goto scanNumber;
|
1178 |
}
|
1179 |
case 'i':
|
1180 |
case 'I': {
|
1181 |
size = 4;
|
1182 |
goto scanNumber;
|
1183 |
}
|
1184 |
case 'f': {
|
1185 |
size = sizeof(float);
|
1186 |
goto scanNumber;
|
1187 |
}
|
1188 |
case 'd': {
|
1189 |
unsigned char *src;
|
1190 |
|
1191 |
size = sizeof(double);
|
1192 |
/* fall through */
|
1193 |
|
1194 |
scanNumber:
|
1195 |
if (arg >= objc) {
|
1196 |
goto badIndex;
|
1197 |
}
|
1198 |
if (count == BINARY_NOCOUNT) {
|
1199 |
if ((length - offset) < size) {
|
1200 |
goto done;
|
1201 |
}
|
1202 |
valuePtr = ScanNumber(buffer+offset, cmd);
|
1203 |
offset += size;
|
1204 |
} else {
|
1205 |
if (count == BINARY_ALL) {
|
1206 |
count = (length - offset) / size;
|
1207 |
}
|
1208 |
if ((length - offset) < (count * size)) {
|
1209 |
goto done;
|
1210 |
}
|
1211 |
valuePtr = Tcl_NewObj();
|
1212 |
src = buffer+offset;
|
1213 |
for (i = 0; i < count; i++) {
|
1214 |
elementPtr = ScanNumber(src, cmd);
|
1215 |
src += size;
|
1216 |
Tcl_ListObjAppendElement(NULL, valuePtr,
|
1217 |
elementPtr);
|
1218 |
}
|
1219 |
offset += count*size;
|
1220 |
}
|
1221 |
|
1222 |
resultPtr = Tcl_ObjSetVar2(interp, objv[arg],
|
1223 |
NULL, valuePtr, TCL_LEAVE_ERR_MSG);
|
1224 |
arg++;
|
1225 |
if (resultPtr == NULL) {
|
1226 |
Tcl_DecrRefCount(valuePtr); /* unneeded */
|
1227 |
return TCL_ERROR;
|
1228 |
}
|
1229 |
break;
|
1230 |
}
|
1231 |
case 'x': {
|
1232 |
if (count == BINARY_NOCOUNT) {
|
1233 |
count = 1;
|
1234 |
}
|
1235 |
if ((count == BINARY_ALL)
|
1236 |
|| (count > (length - offset))) {
|
1237 |
offset = length;
|
1238 |
} else {
|
1239 |
offset += count;
|
1240 |
}
|
1241 |
break;
|
1242 |
}
|
1243 |
case 'X': {
|
1244 |
if (count == BINARY_NOCOUNT) {
|
1245 |
count = 1;
|
1246 |
}
|
1247 |
if ((count == BINARY_ALL) || (count > offset)) {
|
1248 |
offset = 0;
|
1249 |
} else {
|
1250 |
offset -= count;
|
1251 |
}
|
1252 |
break;
|
1253 |
}
|
1254 |
case '@': {
|
1255 |
if (count == BINARY_NOCOUNT) {
|
1256 |
goto badCount;
|
1257 |
}
|
1258 |
if ((count == BINARY_ALL) || (count > length)) {
|
1259 |
offset = length;
|
1260 |
} else {
|
1261 |
offset = count;
|
1262 |
}
|
1263 |
break;
|
1264 |
}
|
1265 |
default: {
|
1266 |
errorString = str;
|
1267 |
goto badfield;
|
1268 |
}
|
1269 |
}
|
1270 |
}
|
1271 |
|
1272 |
/*
|
1273 |
* Set the result to the last position of the cursor.
|
1274 |
*/
|
1275 |
|
1276 |
done:
|
1277 |
Tcl_ResetResult(interp);
|
1278 |
Tcl_SetLongObj(Tcl_GetObjResult(interp), arg - 4);
|
1279 |
break;
|
1280 |
}
|
1281 |
}
|
1282 |
return TCL_OK;
|
1283 |
|
1284 |
badValue:
|
1285 |
Tcl_ResetResult(interp);
|
1286 |
Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "expected ", errorString,
|
1287 |
" string but got \"", errorValue, "\" instead", NULL);
|
1288 |
return TCL_ERROR;
|
1289 |
|
1290 |
badCount:
|
1291 |
errorString = "missing count for \"@\" field specifier";
|
1292 |
goto error;
|
1293 |
|
1294 |
badIndex:
|
1295 |
errorString = "not enough arguments for all format specifiers";
|
1296 |
goto error;
|
1297 |
|
1298 |
badfield: {
|
1299 |
Tcl_UniChar ch;
|
1300 |
char buf[TCL_UTF_MAX + 1];
|
1301 |
|
1302 |
Tcl_UtfToUniChar(errorString, &ch);
|
1303 |
buf[Tcl_UniCharToUtf(ch, buf)] = '\0';
|
1304 |
Tcl_AppendResult(interp, "bad field specifier \"", buf, "\"", NULL);
|
1305 |
return TCL_ERROR;
|
1306 |
}
|
1307 |
|
1308 |
error:
|
1309 |
Tcl_AppendResult(interp, errorString, NULL);
|
1310 |
return TCL_ERROR;
|
1311 |
}
|
1312 |
|
1313 |
/*
|
1314 |
*----------------------------------------------------------------------
|
1315 |
*
|
1316 |
* GetFormatSpec --
|
1317 |
*
|
1318 |
* This function parses the format strings used in the binary
|
1319 |
* format and scan commands.
|
1320 |
*
|
1321 |
* Results:
|
1322 |
* Moves the formatPtr to the start of the next command. Returns
|
1323 |
* the current command character and count in cmdPtr and countPtr.
|
1324 |
* The count is set to BINARY_ALL if the count character was '*'
|
1325 |
* or BINARY_NOCOUNT if no count was specified. Returns 1 on
|
1326 |
* success, or 0 if the string did not have a format specifier.
|
1327 |
*
|
1328 |
* Side effects:
|
1329 |
* None.
|
1330 |
*
|
1331 |
*----------------------------------------------------------------------
|
1332 |
*/
|
1333 |
|
1334 |
static int
|
1335 |
GetFormatSpec(formatPtr, cmdPtr, countPtr)
|
1336 |
char **formatPtr; /* Pointer to format string. */
|
1337 |
char *cmdPtr; /* Pointer to location of command char. */
|
1338 |
int *countPtr; /* Pointer to repeat count value. */
|
1339 |
{
|
1340 |
/*
|
1341 |
* Skip any leading blanks.
|
1342 |
*/
|
1343 |
|
1344 |
while (**formatPtr == ' ') {
|
1345 |
(*formatPtr)++;
|
1346 |
}
|
1347 |
|
1348 |
/*
|
1349 |
* The string was empty, except for whitespace, so fail.
|
1350 |
*/
|
1351 |
|
1352 |
if (!(**formatPtr)) {
|
1353 |
return 0;
|
1354 |
}
|
1355 |
|
1356 |
/*
|
1357 |
* Extract the command character and any trailing digits or '*'.
|
1358 |
*/
|
1359 |
|
1360 |
*cmdPtr = **formatPtr;
|
1361 |
(*formatPtr)++;
|
1362 |
if (**formatPtr == '*') {
|
1363 |
(*formatPtr)++;
|
1364 |
(*countPtr) = BINARY_ALL;
|
1365 |
} else if (isdigit(UCHAR(**formatPtr))) { /* INTL: digit */
|
1366 |
(*countPtr) = strtoul(*formatPtr, formatPtr, 10);
|
1367 |
} else {
|
1368 |
(*countPtr) = BINARY_NOCOUNT;
|
1369 |
}
|
1370 |
return 1;
|
1371 |
}
|
1372 |
|
1373 |
/*
|
1374 |
*----------------------------------------------------------------------
|
1375 |
*
|
1376 |
* FormatNumber --
|
1377 |
*
|
1378 |
* This routine is called by Tcl_BinaryObjCmd to format a number
|
1379 |
* into a location pointed at by cursor.
|
1380 |
*
|
1381 |
* Results:
|
1382 |
* A standard Tcl result.
|
1383 |
*
|
1384 |
* Side effects:
|
1385 |
* Moves the cursor to the next location to be written into.
|
1386 |
*
|
1387 |
*----------------------------------------------------------------------
|
1388 |
*/
|
1389 |
|
1390 |
static int
|
1391 |
FormatNumber(interp, type, src, cursorPtr)
|
1392 |
Tcl_Interp *interp; /* Current interpreter, used to report
|
1393 |
* errors. */
|
1394 |
int type; /* Type of number to format. */
|
1395 |
Tcl_Obj *src; /* Number to format. */
|
1396 |
unsigned char **cursorPtr; /* Pointer to index into destination buffer. */
|
1397 |
{
|
1398 |
int value;
|
1399 |
double dvalue;
|
1400 |
|
1401 |
if ((type == 'd') || (type == 'f')) {
|
1402 |
/*
|
1403 |
* For floating point types, we need to copy the data using
|
1404 |
* memcpy to avoid alignment issues.
|
1405 |
*/
|
1406 |
|
1407 |
if (Tcl_GetDoubleFromObj(interp, src, &dvalue) != TCL_OK) {
|
1408 |
return TCL_ERROR;
|
1409 |
}
|
1410 |
if (type == 'd') {
|
1411 |
memcpy((VOID *) *cursorPtr, (VOID *) &dvalue, sizeof(double));
|
1412 |
*cursorPtr += sizeof(double);
|
1413 |
} else {
|
1414 |
float fvalue;
|
1415 |
|
1416 |
/*
|
1417 |
* Because some compilers will generate floating point exceptions
|
1418 |
* on an overflow cast (e.g. Borland), we restrict the values
|
1419 |
* to the valid range for float.
|
1420 |
*/
|
1421 |
|
1422 |
if (fabs(dvalue) > (double)FLT_MAX) {
|
1423 |
fvalue = (dvalue >= 0.0) ? FLT_MAX : -FLT_MAX;
|
1424 |
} else {
|
1425 |
fvalue = (float) dvalue;
|
1426 |
}
|
1427 |
memcpy((VOID *) *cursorPtr, (VOID *) &fvalue, sizeof(float));
|
1428 |
*cursorPtr += sizeof(float);
|
1429 |
}
|
1430 |
} else {
|
1431 |
if (Tcl_GetIntFromObj(interp, src, &value) != TCL_OK) {
|
1432 |
return TCL_ERROR;
|
1433 |
}
|
1434 |
if (type == 'c') {
|
1435 |
*(*cursorPtr)++ = (unsigned char) value;
|
1436 |
} else if (type == 's') {
|
1437 |
*(*cursorPtr)++ = (unsigned char) value;
|
1438 |
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
1439 |
} else if (type == 'S') {
|
1440 |
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
1441 |
*(*cursorPtr)++ = (unsigned char) value;
|
1442 |
} else if (type == 'i') {
|
1443 |
*(*cursorPtr)++ = (unsigned char) value;
|
1444 |
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
1445 |
*(*cursorPtr)++ = (unsigned char) (value >> 16);
|
1446 |
*(*cursorPtr)++ = (unsigned char) (value >> 24);
|
1447 |
} else if (type == 'I') {
|
1448 |
*(*cursorPtr)++ = (unsigned char) (value >> 24);
|
1449 |
*(*cursorPtr)++ = (unsigned char) (value >> 16);
|
1450 |
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
1451 |
*(*cursorPtr)++ = (unsigned char) value;
|
1452 |
}
|
1453 |
}
|
1454 |
return TCL_OK;
|
1455 |
}
|
1456 |
|
1457 |
/*
|
1458 |
*----------------------------------------------------------------------
|
1459 |
*
|
1460 |
* ScanNumber --
|
1461 |
*
|
1462 |
* This routine is called by Tcl_BinaryObjCmd to scan a number
|
1463 |
* out of a buffer.
|
1464 |
*
|
1465 |
* Results:
|
1466 |
* Returns a newly created object containing the scanned number.
|
1467 |
* This object has a ref count of zero.
|
1468 |
*
|
1469 |
* Side effects:
|
1470 |
* None.
|
1471 |
*
|
1472 |
*----------------------------------------------------------------------
|
1473 |
*/
|
1474 |
|
1475 |
static Tcl_Obj *
|
1476 |
ScanNumber(buffer, type)
|
1477 |
unsigned char *buffer; /* Buffer to scan number from. */
|
1478 |
int type; /* Format character from "binary scan" */
|
1479 |
{
|
1480 |
long value;
|
1481 |
|
1482 |
/*
|
1483 |
* We cannot rely on the compiler to properly sign extend integer values
|
1484 |
* when we cast from smaller values to larger values because we don't know
|
1485 |
* the exact size of the integer types. So, we have to handle sign
|
1486 |
* extension explicitly by checking the high bit and padding with 1's as
|
1487 |
* needed.
|
1488 |
*/
|
1489 |
|
1490 |
switch (type) {
|
1491 |
case 'c': {
|
1492 |
/*
|
1493 |
* Characters need special handling. We want to produce a
|
1494 |
* signed result, but on some platforms (such as AIX) chars
|
1495 |
* are unsigned. To deal with this, check for a value that
|
1496 |
* should be negative but isn't.
|
1497 |
*/
|
1498 |
|
1499 |
value = buffer[0];
|
1500 |
if (value & 0x80) {
|
1501 |
value |= -0x100;
|
1502 |
}
|
1503 |
return Tcl_NewLongObj((long)value);
|
1504 |
}
|
1505 |
case 's': {
|
1506 |
value = (long) (buffer[0] + (buffer[1] << 8));
|
1507 |
goto shortValue;
|
1508 |
}
|
1509 |
case 'S': {
|
1510 |
value = (long) (buffer[1] + (buffer[0] << 8));
|
1511 |
shortValue:
|
1512 |
if (value & 0x8000) {
|
1513 |
value |= -0x10000;
|
1514 |
}
|
1515 |
return Tcl_NewLongObj(value);
|
1516 |
}
|
1517 |
case 'i': {
|
1518 |
value = (long) (buffer[0]
|
1519 |
+ (buffer[1] << 8)
|
1520 |
+ (buffer[2] << 16)
|
1521 |
+ (buffer[3] << 24));
|
1522 |
goto intValue;
|
1523 |
}
|
1524 |
case 'I': {
|
1525 |
value = (long) (buffer[3]
|
1526 |
+ (buffer[2] << 8)
|
1527 |
+ (buffer[1] << 16)
|
1528 |
+ (buffer[0] << 24));
|
1529 |
intValue:
|
1530 |
/*
|
1531 |
* Check to see if the value was sign extended properly on
|
1532 |
* systems where an int is more than 32-bits.
|
1533 |
*/
|
1534 |
|
1535 |
if ((value & (((unsigned int)1)<<31)) && (value > 0)) {
|
1536 |
value -= (((unsigned int)1)<<31);
|
1537 |
value -= (((unsigned int)1)<<31);
|
1538 |
}
|
1539 |
return Tcl_NewLongObj(value);
|
1540 |
}
|
1541 |
case 'f': {
|
1542 |
float fvalue;
|
1543 |
memcpy((VOID *) &fvalue, (VOID *) buffer, sizeof(float));
|
1544 |
return Tcl_NewDoubleObj(fvalue);
|
1545 |
}
|
1546 |
case 'd': {
|
1547 |
double dvalue;
|
1548 |
memcpy((VOID *) &dvalue, (VOID *) buffer, sizeof(double));
|
1549 |
return Tcl_NewDoubleObj(dvalue);
|
1550 |
}
|
1551 |
}
|
1552 |
return NULL;
|
1553 |
}
|
1554 |
|
1555 |
|
1556 |
/* $History: tclbinary.c $
|
1557 |
*
|
1558 |
* ***************** Version 1 *****************
|
1559 |
* User: Dtashley Date: 1/02/01 Time: 1:35a
|
1560 |
* Created in $/IjuScripter, IjuConsole/Source/Tcl Base
|
1561 |
* Initial check-in.
|
1562 |
*/
|
1563 |
|
1564 |
/* End of TCLBINARY.C */ |