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1 | /* struct module -- pack values into and (out of) strings */\r |
2 | \r | |
3 | /* New version supporting byte order, alignment and size options,\r | |
4 | character strings, and unsigned numbers */\r | |
5 | \r | |
6 | #define PY_SSIZE_T_CLEAN\r | |
7 | \r | |
8 | #include "Python.h"\r | |
9 | #include "structseq.h"\r | |
10 | #include "structmember.h"\r | |
11 | #include <ctype.h>\r | |
12 | \r | |
13 | static PyTypeObject PyStructType;\r | |
14 | \r | |
15 | /* compatibility macros */\r | |
16 | #if (PY_VERSION_HEX < 0x02050000)\r | |
17 | typedef int Py_ssize_t;\r | |
18 | #endif\r | |
19 | \r | |
20 | /* warning messages */\r | |
21 | #define FLOAT_COERCE_WARN "integer argument expected, got float"\r | |
22 | #define NON_INTEGER_WARN "integer argument expected, got non-integer " \\r | |
23 | "(implicit conversion using __int__ is deprecated)"\r | |
24 | \r | |
25 | \r | |
26 | /* The translation function for each format character is table driven */\r | |
27 | typedef struct _formatdef {\r | |
28 | char format;\r | |
29 | Py_ssize_t size;\r | |
30 | Py_ssize_t alignment;\r | |
31 | PyObject* (*unpack)(const char *,\r | |
32 | const struct _formatdef *);\r | |
33 | int (*pack)(char *, PyObject *,\r | |
34 | const struct _formatdef *);\r | |
35 | } formatdef;\r | |
36 | \r | |
37 | typedef struct _formatcode {\r | |
38 | const struct _formatdef *fmtdef;\r | |
39 | Py_ssize_t offset;\r | |
40 | Py_ssize_t size;\r | |
41 | } formatcode;\r | |
42 | \r | |
43 | /* Struct object interface */\r | |
44 | \r | |
45 | typedef struct {\r | |
46 | PyObject_HEAD\r | |
47 | Py_ssize_t s_size;\r | |
48 | Py_ssize_t s_len;\r | |
49 | formatcode *s_codes;\r | |
50 | PyObject *s_format;\r | |
51 | PyObject *weakreflist; /* List of weak references */\r | |
52 | } PyStructObject;\r | |
53 | \r | |
54 | \r | |
55 | #define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType)\r | |
56 | #define PyStruct_CheckExact(op) (Py_TYPE(op) == &PyStructType)\r | |
57 | \r | |
58 | \r | |
59 | /* Exception */\r | |
60 | \r | |
61 | static PyObject *StructError;\r | |
62 | \r | |
63 | \r | |
64 | /* Define various structs to figure out the alignments of types */\r | |
65 | \r | |
66 | \r | |
67 | typedef struct { char c; short x; } st_short;\r | |
68 | typedef struct { char c; int x; } st_int;\r | |
69 | typedef struct { char c; long x; } st_long;\r | |
70 | typedef struct { char c; float x; } st_float;\r | |
71 | typedef struct { char c; double x; } st_double;\r | |
72 | typedef struct { char c; void *x; } st_void_p;\r | |
73 | \r | |
74 | #define SHORT_ALIGN (sizeof(st_short) - sizeof(short))\r | |
75 | #define INT_ALIGN (sizeof(st_int) - sizeof(int))\r | |
76 | #define LONG_ALIGN (sizeof(st_long) - sizeof(long))\r | |
77 | #define FLOAT_ALIGN (sizeof(st_float) - sizeof(float))\r | |
78 | #define DOUBLE_ALIGN (sizeof(st_double) - sizeof(double))\r | |
79 | #define VOID_P_ALIGN (sizeof(st_void_p) - sizeof(void *))\r | |
80 | \r | |
81 | /* We can't support q and Q in native mode unless the compiler does;\r | |
82 | in std mode, they're 8 bytes on all platforms. */\r | |
83 | #ifdef HAVE_LONG_LONG\r | |
84 | typedef struct { char c; PY_LONG_LONG x; } s_long_long;\r | |
85 | #define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(PY_LONG_LONG))\r | |
86 | #endif\r | |
87 | \r | |
88 | #ifdef HAVE_C99_BOOL\r | |
89 | #define BOOL_TYPE _Bool\r | |
90 | typedef struct { char c; _Bool x; } s_bool;\r | |
91 | #define BOOL_ALIGN (sizeof(s_bool) - sizeof(BOOL_TYPE))\r | |
92 | #else\r | |
93 | #define BOOL_TYPE char\r | |
94 | #define BOOL_ALIGN 0\r | |
95 | #endif\r | |
96 | \r | |
97 | #define STRINGIFY(x) #x\r | |
98 | \r | |
99 | #ifdef __powerc\r | |
100 | #pragma options align=reset\r | |
101 | #endif\r | |
102 | \r | |
103 | static char *integer_codes = "bBhHiIlLqQ";\r | |
104 | \r | |
105 | /* Helper to get a PyLongObject by hook or by crook. Caller should decref. */\r | |
106 | \r | |
107 | static PyObject *\r | |
108 | get_pylong(PyObject *v)\r | |
109 | {\r | |
110 | PyObject *r, *w;\r | |
111 | int converted = 0;\r | |
112 | assert(v != NULL);\r | |
113 | if (!PyInt_Check(v) && !PyLong_Check(v)) {\r | |
114 | PyNumberMethods *m;\r | |
115 | /* Not an integer; first try to use __index__ to\r | |
116 | convert to an integer. If the __index__ method\r | |
117 | doesn't exist, or raises a TypeError, try __int__.\r | |
118 | Use of the latter is deprecated, and will fail in\r | |
119 | Python 3.x. */\r | |
120 | \r | |
121 | m = Py_TYPE(v)->tp_as_number;\r | |
122 | if (PyIndex_Check(v)) {\r | |
123 | w = PyNumber_Index(v);\r | |
124 | if (w != NULL) {\r | |
125 | v = w;\r | |
126 | /* successfully converted to an integer */\r | |
127 | converted = 1;\r | |
128 | }\r | |
129 | else if (PyErr_ExceptionMatches(PyExc_TypeError)) {\r | |
130 | PyErr_Clear();\r | |
131 | }\r | |
132 | else\r | |
133 | return NULL;\r | |
134 | }\r | |
135 | if (!converted && m != NULL && m->nb_int != NULL) {\r | |
136 | /* Special case warning message for floats, for\r | |
137 | backwards compatibility. */\r | |
138 | if (PyFloat_Check(v)) {\r | |
139 | if (PyErr_WarnEx(\r | |
140 | PyExc_DeprecationWarning,\r | |
141 | FLOAT_COERCE_WARN, 1))\r | |
142 | return NULL;\r | |
143 | }\r | |
144 | else {\r | |
145 | if (PyErr_WarnEx(\r | |
146 | PyExc_DeprecationWarning,\r | |
147 | NON_INTEGER_WARN, 1))\r | |
148 | return NULL;\r | |
149 | }\r | |
150 | v = m->nb_int(v);\r | |
151 | if (v == NULL)\r | |
152 | return NULL;\r | |
153 | if (!PyInt_Check(v) && !PyLong_Check(v)) {\r | |
154 | PyErr_SetString(PyExc_TypeError,\r | |
155 | "__int__ method returned "\r | |
156 | "non-integer");\r | |
157 | return NULL;\r | |
158 | }\r | |
159 | converted = 1;\r | |
160 | }\r | |
161 | if (!converted) {\r | |
162 | PyErr_SetString(StructError,\r | |
163 | "cannot convert argument "\r | |
164 | "to integer");\r | |
165 | return NULL;\r | |
166 | }\r | |
167 | }\r | |
168 | else\r | |
169 | /* Ensure we own a reference to v. */\r | |
170 | Py_INCREF(v);\r | |
171 | \r | |
172 | assert(PyInt_Check(v) || PyLong_Check(v));\r | |
173 | if (PyInt_Check(v)) {\r | |
174 | r = PyLong_FromLong(PyInt_AS_LONG(v));\r | |
175 | Py_DECREF(v);\r | |
176 | }\r | |
177 | else if (PyLong_Check(v)) {\r | |
178 | assert(PyLong_Check(v));\r | |
179 | r = v;\r | |
180 | }\r | |
181 | else {\r | |
182 | r = NULL; /* silence compiler warning about\r | |
183 | possibly uninitialized variable */\r | |
184 | assert(0); /* shouldn't ever get here */\r | |
185 | }\r | |
186 | \r | |
187 | return r;\r | |
188 | }\r | |
189 | \r | |
190 | /* Helper to convert a Python object to a C long. Sets an exception\r | |
191 | (struct.error for an inconvertible type, OverflowError for\r | |
192 | out-of-range values) and returns -1 on error. */\r | |
193 | \r | |
194 | static int\r | |
195 | get_long(PyObject *v, long *p)\r | |
196 | {\r | |
197 | long x;\r | |
198 | \r | |
199 | v = get_pylong(v);\r | |
200 | if (v == NULL)\r | |
201 | return -1;\r | |
202 | assert(PyLong_Check(v));\r | |
203 | x = PyLong_AsLong(v);\r | |
204 | Py_DECREF(v);\r | |
205 | if (x == (long)-1 && PyErr_Occurred())\r | |
206 | return -1;\r | |
207 | *p = x;\r | |
208 | return 0;\r | |
209 | }\r | |
210 | \r | |
211 | /* Same, but handling unsigned long */\r | |
212 | \r | |
213 | static int\r | |
214 | get_ulong(PyObject *v, unsigned long *p)\r | |
215 | {\r | |
216 | unsigned long x;\r | |
217 | \r | |
218 | v = get_pylong(v);\r | |
219 | if (v == NULL)\r | |
220 | return -1;\r | |
221 | assert(PyLong_Check(v));\r | |
222 | x = PyLong_AsUnsignedLong(v);\r | |
223 | Py_DECREF(v);\r | |
224 | if (x == (unsigned long)-1 && PyErr_Occurred())\r | |
225 | return -1;\r | |
226 | *p = x;\r | |
227 | return 0;\r | |
228 | }\r | |
229 | \r | |
230 | #ifdef HAVE_LONG_LONG\r | |
231 | \r | |
232 | /* Same, but handling native long long. */\r | |
233 | \r | |
234 | static int\r | |
235 | get_longlong(PyObject *v, PY_LONG_LONG *p)\r | |
236 | {\r | |
237 | PY_LONG_LONG x;\r | |
238 | \r | |
239 | v = get_pylong(v);\r | |
240 | if (v == NULL)\r | |
241 | return -1;\r | |
242 | assert(PyLong_Check(v));\r | |
243 | x = PyLong_AsLongLong(v);\r | |
244 | Py_DECREF(v);\r | |
245 | if (x == (PY_LONG_LONG)-1 && PyErr_Occurred())\r | |
246 | return -1;\r | |
247 | *p = x;\r | |
248 | return 0;\r | |
249 | }\r | |
250 | \r | |
251 | /* Same, but handling native unsigned long long. */\r | |
252 | \r | |
253 | static int\r | |
254 | get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)\r | |
255 | {\r | |
256 | unsigned PY_LONG_LONG x;\r | |
257 | \r | |
258 | v = get_pylong(v);\r | |
259 | if (v == NULL)\r | |
260 | return -1;\r | |
261 | assert(PyLong_Check(v));\r | |
262 | x = PyLong_AsUnsignedLongLong(v);\r | |
263 | Py_DECREF(v);\r | |
264 | if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())\r | |
265 | return -1;\r | |
266 | *p = x;\r | |
267 | return 0;\r | |
268 | }\r | |
269 | \r | |
270 | #endif\r | |
271 | \r | |
272 | /* Floating point helpers */\r | |
273 | \r | |
274 | static PyObject *\r | |
275 | unpack_float(const char *p, /* start of 4-byte string */\r | |
276 | int le) /* true for little-endian, false for big-endian */\r | |
277 | {\r | |
278 | double x;\r | |
279 | \r | |
280 | x = _PyFloat_Unpack4((unsigned char *)p, le);\r | |
281 | if (x == -1.0 && PyErr_Occurred())\r | |
282 | return NULL;\r | |
283 | return PyFloat_FromDouble(x);\r | |
284 | }\r | |
285 | \r | |
286 | static PyObject *\r | |
287 | unpack_double(const char *p, /* start of 8-byte string */\r | |
288 | int le) /* true for little-endian, false for big-endian */\r | |
289 | {\r | |
290 | double x;\r | |
291 | \r | |
292 | x = _PyFloat_Unpack8((unsigned char *)p, le);\r | |
293 | if (x == -1.0 && PyErr_Occurred())\r | |
294 | return NULL;\r | |
295 | return PyFloat_FromDouble(x);\r | |
296 | }\r | |
297 | \r | |
298 | /* Helper to format the range error exceptions */\r | |
299 | static int\r | |
300 | _range_error(const formatdef *f, int is_unsigned)\r | |
301 | {\r | |
302 | /* ulargest is the largest unsigned value with f->size bytes.\r | |
303 | * Note that the simpler:\r | |
304 | * ((size_t)1 << (f->size * 8)) - 1\r | |
305 | * doesn't work when f->size == sizeof(size_t) because C doesn't\r | |
306 | * define what happens when a left shift count is >= the number of\r | |
307 | * bits in the integer being shifted; e.g., on some boxes it doesn't\r | |
308 | * shift at all when they're equal.\r | |
309 | */\r | |
310 | const size_t ulargest = (size_t)-1 >> ((SIZEOF_SIZE_T - f->size)*8);\r | |
311 | assert(f->size >= 1 && f->size <= SIZEOF_SIZE_T);\r | |
312 | if (is_unsigned)\r | |
313 | PyErr_Format(StructError,\r | |
314 | "'%c' format requires 0 <= number <= %zu",\r | |
315 | f->format,\r | |
316 | ulargest);\r | |
317 | else {\r | |
318 | const Py_ssize_t largest = (Py_ssize_t)(ulargest >> 1);\r | |
319 | PyErr_Format(StructError,\r | |
320 | "'%c' format requires %zd <= number <= %zd",\r | |
321 | f->format,\r | |
322 | ~ largest,\r | |
323 | largest);\r | |
324 | }\r | |
325 | return -1;\r | |
326 | }\r | |
327 | \r | |
328 | \r | |
329 | \r | |
330 | /* A large number of small routines follow, with names of the form\r | |
331 | \r | |
332 | [bln][up]_TYPE\r | |
333 | \r | |
334 | [bln] distiguishes among big-endian, little-endian and native.\r | |
335 | [pu] distiguishes between pack (to struct) and unpack (from struct).\r | |
336 | TYPE is one of char, byte, ubyte, etc.\r | |
337 | */\r | |
338 | \r | |
339 | /* Native mode routines. ****************************************************/\r | |
340 | /* NOTE:\r | |
341 | In all n[up]_<type> routines handling types larger than 1 byte, there is\r | |
342 | *no* guarantee that the p pointer is properly aligned for each type,\r | |
343 | therefore memcpy is called. An intermediate variable is used to\r | |
344 | compensate for big-endian architectures.\r | |
345 | Normally both the intermediate variable and the memcpy call will be\r | |
346 | skipped by C optimisation in little-endian architectures (gcc >= 2.91\r | |
347 | does this). */\r | |
348 | \r | |
349 | static PyObject *\r | |
350 | nu_char(const char *p, const formatdef *f)\r | |
351 | {\r | |
352 | return PyString_FromStringAndSize(p, 1);\r | |
353 | }\r | |
354 | \r | |
355 | static PyObject *\r | |
356 | nu_byte(const char *p, const formatdef *f)\r | |
357 | {\r | |
358 | return PyInt_FromLong((long) *(signed char *)p);\r | |
359 | }\r | |
360 | \r | |
361 | static PyObject *\r | |
362 | nu_ubyte(const char *p, const formatdef *f)\r | |
363 | {\r | |
364 | return PyInt_FromLong((long) *(unsigned char *)p);\r | |
365 | }\r | |
366 | \r | |
367 | static PyObject *\r | |
368 | nu_short(const char *p, const formatdef *f)\r | |
369 | {\r | |
370 | short x;\r | |
371 | memcpy((char *)&x, p, sizeof x);\r | |
372 | return PyInt_FromLong((long)x);\r | |
373 | }\r | |
374 | \r | |
375 | static PyObject *\r | |
376 | nu_ushort(const char *p, const formatdef *f)\r | |
377 | {\r | |
378 | unsigned short x;\r | |
379 | memcpy((char *)&x, p, sizeof x);\r | |
380 | return PyInt_FromLong((long)x);\r | |
381 | }\r | |
382 | \r | |
383 | static PyObject *\r | |
384 | nu_int(const char *p, const formatdef *f)\r | |
385 | {\r | |
386 | int x;\r | |
387 | memcpy((char *)&x, p, sizeof x);\r | |
388 | return PyInt_FromLong((long)x);\r | |
389 | }\r | |
390 | \r | |
391 | static PyObject *\r | |
392 | nu_uint(const char *p, const formatdef *f)\r | |
393 | {\r | |
394 | unsigned int x;\r | |
395 | memcpy((char *)&x, p, sizeof x);\r | |
396 | #if (SIZEOF_LONG > SIZEOF_INT)\r | |
397 | return PyInt_FromLong((long)x);\r | |
398 | #else\r | |
399 | if (x <= ((unsigned int)LONG_MAX))\r | |
400 | return PyInt_FromLong((long)x);\r | |
401 | return PyLong_FromUnsignedLong((unsigned long)x);\r | |
402 | #endif\r | |
403 | }\r | |
404 | \r | |
405 | static PyObject *\r | |
406 | nu_long(const char *p, const formatdef *f)\r | |
407 | {\r | |
408 | long x;\r | |
409 | memcpy((char *)&x, p, sizeof x);\r | |
410 | return PyInt_FromLong(x);\r | |
411 | }\r | |
412 | \r | |
413 | static PyObject *\r | |
414 | nu_ulong(const char *p, const formatdef *f)\r | |
415 | {\r | |
416 | unsigned long x;\r | |
417 | memcpy((char *)&x, p, sizeof x);\r | |
418 | if (x <= LONG_MAX)\r | |
419 | return PyInt_FromLong((long)x);\r | |
420 | return PyLong_FromUnsignedLong(x);\r | |
421 | }\r | |
422 | \r | |
423 | /* Native mode doesn't support q or Q unless the platform C supports\r | |
424 | long long (or, on Windows, __int64). */\r | |
425 | \r | |
426 | #ifdef HAVE_LONG_LONG\r | |
427 | \r | |
428 | static PyObject *\r | |
429 | nu_longlong(const char *p, const formatdef *f)\r | |
430 | {\r | |
431 | PY_LONG_LONG x;\r | |
432 | memcpy((char *)&x, p, sizeof x);\r | |
433 | if (x >= LONG_MIN && x <= LONG_MAX)\r | |
434 | return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));\r | |
435 | return PyLong_FromLongLong(x);\r | |
436 | }\r | |
437 | \r | |
438 | static PyObject *\r | |
439 | nu_ulonglong(const char *p, const formatdef *f)\r | |
440 | {\r | |
441 | unsigned PY_LONG_LONG x;\r | |
442 | memcpy((char *)&x, p, sizeof x);\r | |
443 | if (x <= LONG_MAX)\r | |
444 | return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));\r | |
445 | return PyLong_FromUnsignedLongLong(x);\r | |
446 | }\r | |
447 | \r | |
448 | #endif\r | |
449 | \r | |
450 | static PyObject *\r | |
451 | nu_bool(const char *p, const formatdef *f)\r | |
452 | {\r | |
453 | BOOL_TYPE x;\r | |
454 | memcpy((char *)&x, p, sizeof x);\r | |
455 | return PyBool_FromLong(x != 0);\r | |
456 | }\r | |
457 | \r | |
458 | \r | |
459 | static PyObject *\r | |
460 | nu_float(const char *p, const formatdef *f)\r | |
461 | {\r | |
462 | float x;\r | |
463 | memcpy((char *)&x, p, sizeof x);\r | |
464 | return PyFloat_FromDouble((double)x);\r | |
465 | }\r | |
466 | \r | |
467 | static PyObject *\r | |
468 | nu_double(const char *p, const formatdef *f)\r | |
469 | {\r | |
470 | double x;\r | |
471 | memcpy((char *)&x, p, sizeof x);\r | |
472 | return PyFloat_FromDouble(x);\r | |
473 | }\r | |
474 | \r | |
475 | static PyObject *\r | |
476 | nu_void_p(const char *p, const formatdef *f)\r | |
477 | {\r | |
478 | void *x;\r | |
479 | memcpy((char *)&x, p, sizeof x);\r | |
480 | return PyLong_FromVoidPtr(x);\r | |
481 | }\r | |
482 | \r | |
483 | static int\r | |
484 | np_byte(char *p, PyObject *v, const formatdef *f)\r | |
485 | {\r | |
486 | long x;\r | |
487 | if (get_long(v, &x) < 0)\r | |
488 | return -1;\r | |
489 | if (x < -128 || x > 127){\r | |
490 | PyErr_SetString(StructError,\r | |
491 | "byte format requires -128 <= number <= 127");\r | |
492 | return -1;\r | |
493 | }\r | |
494 | *p = (char)x;\r | |
495 | return 0;\r | |
496 | }\r | |
497 | \r | |
498 | static int\r | |
499 | np_ubyte(char *p, PyObject *v, const formatdef *f)\r | |
500 | {\r | |
501 | long x;\r | |
502 | if (get_long(v, &x) < 0)\r | |
503 | return -1;\r | |
504 | if (x < 0 || x > 255){\r | |
505 | PyErr_SetString(StructError,\r | |
506 | "ubyte format requires 0 <= number <= 255");\r | |
507 | return -1;\r | |
508 | }\r | |
509 | *p = (char)x;\r | |
510 | return 0;\r | |
511 | }\r | |
512 | \r | |
513 | static int\r | |
514 | np_char(char *p, PyObject *v, const formatdef *f)\r | |
515 | {\r | |
516 | if (!PyString_Check(v) || PyString_Size(v) != 1) {\r | |
517 | PyErr_SetString(StructError,\r | |
518 | "char format require string of length 1");\r | |
519 | return -1;\r | |
520 | }\r | |
521 | *p = *PyString_AsString(v);\r | |
522 | return 0;\r | |
523 | }\r | |
524 | \r | |
525 | static int\r | |
526 | np_short(char *p, PyObject *v, const formatdef *f)\r | |
527 | {\r | |
528 | long x;\r | |
529 | short y;\r | |
530 | if (get_long(v, &x) < 0)\r | |
531 | return -1;\r | |
532 | if (x < SHRT_MIN || x > SHRT_MAX){\r | |
533 | PyErr_SetString(StructError,\r | |
534 | "short format requires " STRINGIFY(SHRT_MIN)\r | |
535 | " <= number <= " STRINGIFY(SHRT_MAX));\r | |
536 | return -1;\r | |
537 | }\r | |
538 | y = (short)x;\r | |
539 | memcpy(p, (char *)&y, sizeof y);\r | |
540 | return 0;\r | |
541 | }\r | |
542 | \r | |
543 | static int\r | |
544 | np_ushort(char *p, PyObject *v, const formatdef *f)\r | |
545 | {\r | |
546 | long x;\r | |
547 | unsigned short y;\r | |
548 | if (get_long(v, &x) < 0)\r | |
549 | return -1;\r | |
550 | if (x < 0 || x > USHRT_MAX){\r | |
551 | PyErr_SetString(StructError,\r | |
552 | "ushort format requires 0 <= number <= " STRINGIFY(USHRT_MAX));\r | |
553 | return -1;\r | |
554 | }\r | |
555 | y = (unsigned short)x;\r | |
556 | memcpy(p, (char *)&y, sizeof y);\r | |
557 | return 0;\r | |
558 | }\r | |
559 | \r | |
560 | static int\r | |
561 | np_int(char *p, PyObject *v, const formatdef *f)\r | |
562 | {\r | |
563 | long x;\r | |
564 | int y;\r | |
565 | if (get_long(v, &x) < 0)\r | |
566 | return -1;\r | |
567 | #if (SIZEOF_LONG > SIZEOF_INT)\r | |
568 | if ((x < ((long)INT_MIN)) || (x > ((long)INT_MAX)))\r | |
569 | return _range_error(f, 0);\r | |
570 | #endif\r | |
571 | y = (int)x;\r | |
572 | memcpy(p, (char *)&y, sizeof y);\r | |
573 | return 0;\r | |
574 | }\r | |
575 | \r | |
576 | static int\r | |
577 | np_uint(char *p, PyObject *v, const formatdef *f)\r | |
578 | {\r | |
579 | unsigned long x;\r | |
580 | unsigned int y;\r | |
581 | if (get_ulong(v, &x) < 0)\r | |
582 | return -1;\r | |
583 | y = (unsigned int)x;\r | |
584 | #if (SIZEOF_LONG > SIZEOF_INT)\r | |
585 | if (x > ((unsigned long)UINT_MAX))\r | |
586 | return _range_error(f, 1);\r | |
587 | #endif\r | |
588 | memcpy(p, (char *)&y, sizeof y);\r | |
589 | return 0;\r | |
590 | }\r | |
591 | \r | |
592 | static int\r | |
593 | np_long(char *p, PyObject *v, const formatdef *f)\r | |
594 | {\r | |
595 | long x;\r | |
596 | if (get_long(v, &x) < 0)\r | |
597 | return -1;\r | |
598 | memcpy(p, (char *)&x, sizeof x);\r | |
599 | return 0;\r | |
600 | }\r | |
601 | \r | |
602 | static int\r | |
603 | np_ulong(char *p, PyObject *v, const formatdef *f)\r | |
604 | {\r | |
605 | unsigned long x;\r | |
606 | if (get_ulong(v, &x) < 0)\r | |
607 | return -1;\r | |
608 | memcpy(p, (char *)&x, sizeof x);\r | |
609 | return 0;\r | |
610 | }\r | |
611 | \r | |
612 | #ifdef HAVE_LONG_LONG\r | |
613 | \r | |
614 | static int\r | |
615 | np_longlong(char *p, PyObject *v, const formatdef *f)\r | |
616 | {\r | |
617 | PY_LONG_LONG x;\r | |
618 | if (get_longlong(v, &x) < 0)\r | |
619 | return -1;\r | |
620 | memcpy(p, (char *)&x, sizeof x);\r | |
621 | return 0;\r | |
622 | }\r | |
623 | \r | |
624 | static int\r | |
625 | np_ulonglong(char *p, PyObject *v, const formatdef *f)\r | |
626 | {\r | |
627 | unsigned PY_LONG_LONG x;\r | |
628 | if (get_ulonglong(v, &x) < 0)\r | |
629 | return -1;\r | |
630 | memcpy(p, (char *)&x, sizeof x);\r | |
631 | return 0;\r | |
632 | }\r | |
633 | #endif\r | |
634 | \r | |
635 | \r | |
636 | static int\r | |
637 | np_bool(char *p, PyObject *v, const formatdef *f)\r | |
638 | {\r | |
639 | int y;\r | |
640 | BOOL_TYPE x;\r | |
641 | y = PyObject_IsTrue(v);\r | |
642 | if (y < 0)\r | |
643 | return -1;\r | |
644 | x = y;\r | |
645 | memcpy(p, (char *)&x, sizeof x);\r | |
646 | return 0;\r | |
647 | }\r | |
648 | \r | |
649 | static int\r | |
650 | np_float(char *p, PyObject *v, const formatdef *f)\r | |
651 | {\r | |
652 | float x = (float)PyFloat_AsDouble(v);\r | |
653 | if (x == -1 && PyErr_Occurred()) {\r | |
654 | PyErr_SetString(StructError,\r | |
655 | "required argument is not a float");\r | |
656 | return -1;\r | |
657 | }\r | |
658 | memcpy(p, (char *)&x, sizeof x);\r | |
659 | return 0;\r | |
660 | }\r | |
661 | \r | |
662 | static int\r | |
663 | np_double(char *p, PyObject *v, const formatdef *f)\r | |
664 | {\r | |
665 | double x = PyFloat_AsDouble(v);\r | |
666 | if (x == -1 && PyErr_Occurred()) {\r | |
667 | PyErr_SetString(StructError,\r | |
668 | "required argument is not a float");\r | |
669 | return -1;\r | |
670 | }\r | |
671 | memcpy(p, (char *)&x, sizeof(double));\r | |
672 | return 0;\r | |
673 | }\r | |
674 | \r | |
675 | static int\r | |
676 | np_void_p(char *p, PyObject *v, const formatdef *f)\r | |
677 | {\r | |
678 | void *x;\r | |
679 | \r | |
680 | v = get_pylong(v);\r | |
681 | if (v == NULL)\r | |
682 | return -1;\r | |
683 | assert(PyLong_Check(v));\r | |
684 | x = PyLong_AsVoidPtr(v);\r | |
685 | Py_DECREF(v);\r | |
686 | if (x == NULL && PyErr_Occurred())\r | |
687 | return -1;\r | |
688 | memcpy(p, (char *)&x, sizeof x);\r | |
689 | return 0;\r | |
690 | }\r | |
691 | \r | |
692 | static formatdef native_table[] = {\r | |
693 | {'x', sizeof(char), 0, NULL},\r | |
694 | {'b', sizeof(char), 0, nu_byte, np_byte},\r | |
695 | {'B', sizeof(char), 0, nu_ubyte, np_ubyte},\r | |
696 | {'c', sizeof(char), 0, nu_char, np_char},\r | |
697 | {'s', sizeof(char), 0, NULL},\r | |
698 | {'p', sizeof(char), 0, NULL},\r | |
699 | {'h', sizeof(short), SHORT_ALIGN, nu_short, np_short},\r | |
700 | {'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_ushort},\r | |
701 | {'i', sizeof(int), INT_ALIGN, nu_int, np_int},\r | |
702 | {'I', sizeof(int), INT_ALIGN, nu_uint, np_uint},\r | |
703 | {'l', sizeof(long), LONG_ALIGN, nu_long, np_long},\r | |
704 | {'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong},\r | |
705 | #ifdef HAVE_LONG_LONG\r | |
706 | {'q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_longlong, np_longlong},\r | |
707 | {'Q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_ulonglong,np_ulonglong},\r | |
708 | #endif\r | |
709 | {'?', sizeof(BOOL_TYPE), BOOL_ALIGN, nu_bool, np_bool},\r | |
710 | {'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float},\r | |
711 | {'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double},\r | |
712 | {'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p},\r | |
713 | {0}\r | |
714 | };\r | |
715 | \r | |
716 | /* Big-endian routines. *****************************************************/\r | |
717 | \r | |
718 | static PyObject *\r | |
719 | bu_int(const char *p, const formatdef *f)\r | |
720 | {\r | |
721 | long x = 0;\r | |
722 | Py_ssize_t i = f->size;\r | |
723 | const unsigned char *bytes = (const unsigned char *)p;\r | |
724 | do {\r | |
725 | x = (x<<8) | *bytes++;\r | |
726 | } while (--i > 0);\r | |
727 | /* Extend the sign bit. */\r | |
728 | if (SIZEOF_LONG > f->size)\r | |
729 | x |= -(x & (1L << ((8 * f->size) - 1)));\r | |
730 | return PyInt_FromLong(x);\r | |
731 | }\r | |
732 | \r | |
733 | static PyObject *\r | |
734 | bu_uint(const char *p, const formatdef *f)\r | |
735 | {\r | |
736 | unsigned long x = 0;\r | |
737 | Py_ssize_t i = f->size;\r | |
738 | const unsigned char *bytes = (const unsigned char *)p;\r | |
739 | do {\r | |
740 | x = (x<<8) | *bytes++;\r | |
741 | } while (--i > 0);\r | |
742 | if (x <= LONG_MAX)\r | |
743 | return PyInt_FromLong((long)x);\r | |
744 | return PyLong_FromUnsignedLong(x);\r | |
745 | }\r | |
746 | \r | |
747 | static PyObject *\r | |
748 | bu_longlong(const char *p, const formatdef *f)\r | |
749 | {\r | |
750 | #ifdef HAVE_LONG_LONG\r | |
751 | PY_LONG_LONG x = 0;\r | |
752 | Py_ssize_t i = f->size;\r | |
753 | const unsigned char *bytes = (const unsigned char *)p;\r | |
754 | do {\r | |
755 | x = (x<<8) | *bytes++;\r | |
756 | } while (--i > 0);\r | |
757 | /* Extend the sign bit. */\r | |
758 | if (SIZEOF_LONG_LONG > f->size)\r | |
759 | x |= -(x & ((PY_LONG_LONG)1 << ((8 * f->size) - 1)));\r | |
760 | if (x >= LONG_MIN && x <= LONG_MAX)\r | |
761 | return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));\r | |
762 | return PyLong_FromLongLong(x);\r | |
763 | #else\r | |
764 | return _PyLong_FromByteArray((const unsigned char *)p,\r | |
765 | 8,\r | |
766 | 0, /* little-endian */\r | |
767 | 1 /* signed */);\r | |
768 | #endif\r | |
769 | }\r | |
770 | \r | |
771 | static PyObject *\r | |
772 | bu_ulonglong(const char *p, const formatdef *f)\r | |
773 | {\r | |
774 | #ifdef HAVE_LONG_LONG\r | |
775 | unsigned PY_LONG_LONG x = 0;\r | |
776 | Py_ssize_t i = f->size;\r | |
777 | const unsigned char *bytes = (const unsigned char *)p;\r | |
778 | do {\r | |
779 | x = (x<<8) | *bytes++;\r | |
780 | } while (--i > 0);\r | |
781 | if (x <= LONG_MAX)\r | |
782 | return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));\r | |
783 | return PyLong_FromUnsignedLongLong(x);\r | |
784 | #else\r | |
785 | return _PyLong_FromByteArray((const unsigned char *)p,\r | |
786 | 8,\r | |
787 | 0, /* little-endian */\r | |
788 | 0 /* signed */);\r | |
789 | #endif\r | |
790 | }\r | |
791 | \r | |
792 | static PyObject *\r | |
793 | bu_float(const char *p, const formatdef *f)\r | |
794 | {\r | |
795 | return unpack_float(p, 0);\r | |
796 | }\r | |
797 | \r | |
798 | static PyObject *\r | |
799 | bu_double(const char *p, const formatdef *f)\r | |
800 | {\r | |
801 | return unpack_double(p, 0);\r | |
802 | }\r | |
803 | \r | |
804 | static PyObject *\r | |
805 | bu_bool(const char *p, const formatdef *f)\r | |
806 | {\r | |
807 | char x;\r | |
808 | memcpy((char *)&x, p, sizeof x);\r | |
809 | return PyBool_FromLong(x != 0);\r | |
810 | }\r | |
811 | \r | |
812 | static int\r | |
813 | bp_int(char *p, PyObject *v, const formatdef *f)\r | |
814 | {\r | |
815 | long x;\r | |
816 | Py_ssize_t i;\r | |
817 | if (get_long(v, &x) < 0)\r | |
818 | return -1;\r | |
819 | i = f->size;\r | |
820 | if (i != SIZEOF_LONG) {\r | |
821 | if ((i == 2) && (x < -32768 || x > 32767))\r | |
822 | return _range_error(f, 0);\r | |
823 | #if (SIZEOF_LONG != 4)\r | |
824 | else if ((i == 4) && (x < -2147483648L || x > 2147483647L))\r | |
825 | return _range_error(f, 0);\r | |
826 | #endif\r | |
827 | }\r | |
828 | do {\r | |
829 | p[--i] = (char)x;\r | |
830 | x >>= 8;\r | |
831 | } while (i > 0);\r | |
832 | return 0;\r | |
833 | }\r | |
834 | \r | |
835 | static int\r | |
836 | bp_uint(char *p, PyObject *v, const formatdef *f)\r | |
837 | {\r | |
838 | unsigned long x;\r | |
839 | Py_ssize_t i;\r | |
840 | if (get_ulong(v, &x) < 0)\r | |
841 | return -1;\r | |
842 | i = f->size;\r | |
843 | if (i != SIZEOF_LONG) {\r | |
844 | unsigned long maxint = 1;\r | |
845 | maxint <<= (unsigned long)(i * 8);\r | |
846 | if (x >= maxint)\r | |
847 | return _range_error(f, 1);\r | |
848 | }\r | |
849 | do {\r | |
850 | p[--i] = (char)x;\r | |
851 | x >>= 8;\r | |
852 | } while (i > 0);\r | |
853 | return 0;\r | |
854 | }\r | |
855 | \r | |
856 | static int\r | |
857 | bp_longlong(char *p, PyObject *v, const formatdef *f)\r | |
858 | {\r | |
859 | int res;\r | |
860 | v = get_pylong(v);\r | |
861 | if (v == NULL)\r | |
862 | return -1;\r | |
863 | res = _PyLong_AsByteArray((PyLongObject *)v,\r | |
864 | (unsigned char *)p,\r | |
865 | 8,\r | |
866 | 0, /* little_endian */\r | |
867 | 1 /* signed */);\r | |
868 | Py_DECREF(v);\r | |
869 | return res;\r | |
870 | }\r | |
871 | \r | |
872 | static int\r | |
873 | bp_ulonglong(char *p, PyObject *v, const formatdef *f)\r | |
874 | {\r | |
875 | int res;\r | |
876 | v = get_pylong(v);\r | |
877 | if (v == NULL)\r | |
878 | return -1;\r | |
879 | res = _PyLong_AsByteArray((PyLongObject *)v,\r | |
880 | (unsigned char *)p,\r | |
881 | 8,\r | |
882 | 0, /* little_endian */\r | |
883 | 0 /* signed */);\r | |
884 | Py_DECREF(v);\r | |
885 | return res;\r | |
886 | }\r | |
887 | \r | |
888 | static int\r | |
889 | bp_float(char *p, PyObject *v, const formatdef *f)\r | |
890 | {\r | |
891 | double x = PyFloat_AsDouble(v);\r | |
892 | if (x == -1 && PyErr_Occurred()) {\r | |
893 | PyErr_SetString(StructError,\r | |
894 | "required argument is not a float");\r | |
895 | return -1;\r | |
896 | }\r | |
897 | return _PyFloat_Pack4(x, (unsigned char *)p, 0);\r | |
898 | }\r | |
899 | \r | |
900 | static int\r | |
901 | bp_double(char *p, PyObject *v, const formatdef *f)\r | |
902 | {\r | |
903 | double x = PyFloat_AsDouble(v);\r | |
904 | if (x == -1 && PyErr_Occurred()) {\r | |
905 | PyErr_SetString(StructError,\r | |
906 | "required argument is not a float");\r | |
907 | return -1;\r | |
908 | }\r | |
909 | return _PyFloat_Pack8(x, (unsigned char *)p, 0);\r | |
910 | }\r | |
911 | \r | |
912 | static int\r | |
913 | bp_bool(char *p, PyObject *v, const formatdef *f)\r | |
914 | {\r | |
915 | int y;\r | |
916 | y = PyObject_IsTrue(v);\r | |
917 | if (y < 0)\r | |
918 | return -1;\r | |
919 | *p = (char)y;\r | |
920 | return 0;\r | |
921 | }\r | |
922 | \r | |
923 | static formatdef bigendian_table[] = {\r | |
924 | {'x', 1, 0, NULL},\r | |
925 | {'b', 1, 0, nu_byte, np_byte},\r | |
926 | {'B', 1, 0, nu_ubyte, np_ubyte},\r | |
927 | {'c', 1, 0, nu_char, np_char},\r | |
928 | {'s', 1, 0, NULL},\r | |
929 | {'p', 1, 0, NULL},\r | |
930 | {'h', 2, 0, bu_int, bp_int},\r | |
931 | {'H', 2, 0, bu_uint, bp_uint},\r | |
932 | {'i', 4, 0, bu_int, bp_int},\r | |
933 | {'I', 4, 0, bu_uint, bp_uint},\r | |
934 | {'l', 4, 0, bu_int, bp_int},\r | |
935 | {'L', 4, 0, bu_uint, bp_uint},\r | |
936 | {'q', 8, 0, bu_longlong, bp_longlong},\r | |
937 | {'Q', 8, 0, bu_ulonglong, bp_ulonglong},\r | |
938 | {'?', 1, 0, bu_bool, bp_bool},\r | |
939 | {'f', 4, 0, bu_float, bp_float},\r | |
940 | {'d', 8, 0, bu_double, bp_double},\r | |
941 | {0}\r | |
942 | };\r | |
943 | \r | |
944 | /* Little-endian routines. *****************************************************/\r | |
945 | \r | |
946 | static PyObject *\r | |
947 | lu_int(const char *p, const formatdef *f)\r | |
948 | {\r | |
949 | long x = 0;\r | |
950 | Py_ssize_t i = f->size;\r | |
951 | const unsigned char *bytes = (const unsigned char *)p;\r | |
952 | do {\r | |
953 | x = (x<<8) | bytes[--i];\r | |
954 | } while (i > 0);\r | |
955 | /* Extend the sign bit. */\r | |
956 | if (SIZEOF_LONG > f->size)\r | |
957 | x |= -(x & (1L << ((8 * f->size) - 1)));\r | |
958 | return PyInt_FromLong(x);\r | |
959 | }\r | |
960 | \r | |
961 | static PyObject *\r | |
962 | lu_uint(const char *p, const formatdef *f)\r | |
963 | {\r | |
964 | unsigned long x = 0;\r | |
965 | Py_ssize_t i = f->size;\r | |
966 | const unsigned char *bytes = (const unsigned char *)p;\r | |
967 | do {\r | |
968 | x = (x<<8) | bytes[--i];\r | |
969 | } while (i > 0);\r | |
970 | if (x <= LONG_MAX)\r | |
971 | return PyInt_FromLong((long)x);\r | |
972 | return PyLong_FromUnsignedLong((long)x);\r | |
973 | }\r | |
974 | \r | |
975 | static PyObject *\r | |
976 | lu_longlong(const char *p, const formatdef *f)\r | |
977 | {\r | |
978 | #ifdef HAVE_LONG_LONG\r | |
979 | PY_LONG_LONG x = 0;\r | |
980 | Py_ssize_t i = f->size;\r | |
981 | const unsigned char *bytes = (const unsigned char *)p;\r | |
982 | do {\r | |
983 | x = (x<<8) | bytes[--i];\r | |
984 | } while (i > 0);\r | |
985 | /* Extend the sign bit. */\r | |
986 | if (SIZEOF_LONG_LONG > f->size)\r | |
987 | x |= -(x & ((PY_LONG_LONG)1 << ((8 * f->size) - 1)));\r | |
988 | if (x >= LONG_MIN && x <= LONG_MAX)\r | |
989 | return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));\r | |
990 | return PyLong_FromLongLong(x);\r | |
991 | #else\r | |
992 | return _PyLong_FromByteArray((const unsigned char *)p,\r | |
993 | 8,\r | |
994 | 1, /* little-endian */\r | |
995 | 1 /* signed */);\r | |
996 | #endif\r | |
997 | }\r | |
998 | \r | |
999 | static PyObject *\r | |
1000 | lu_ulonglong(const char *p, const formatdef *f)\r | |
1001 | {\r | |
1002 | #ifdef HAVE_LONG_LONG\r | |
1003 | unsigned PY_LONG_LONG x = 0;\r | |
1004 | Py_ssize_t i = f->size;\r | |
1005 | const unsigned char *bytes = (const unsigned char *)p;\r | |
1006 | do {\r | |
1007 | x = (x<<8) | bytes[--i];\r | |
1008 | } while (i > 0);\r | |
1009 | if (x <= LONG_MAX)\r | |
1010 | return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));\r | |
1011 | return PyLong_FromUnsignedLongLong(x);\r | |
1012 | #else\r | |
1013 | return _PyLong_FromByteArray((const unsigned char *)p,\r | |
1014 | 8,\r | |
1015 | 1, /* little-endian */\r | |
1016 | 0 /* signed */);\r | |
1017 | #endif\r | |
1018 | }\r | |
1019 | \r | |
1020 | static PyObject *\r | |
1021 | lu_float(const char *p, const formatdef *f)\r | |
1022 | {\r | |
1023 | return unpack_float(p, 1);\r | |
1024 | }\r | |
1025 | \r | |
1026 | static PyObject *\r | |
1027 | lu_double(const char *p, const formatdef *f)\r | |
1028 | {\r | |
1029 | return unpack_double(p, 1);\r | |
1030 | }\r | |
1031 | \r | |
1032 | static int\r | |
1033 | lp_int(char *p, PyObject *v, const formatdef *f)\r | |
1034 | {\r | |
1035 | long x;\r | |
1036 | Py_ssize_t i;\r | |
1037 | if (get_long(v, &x) < 0)\r | |
1038 | return -1;\r | |
1039 | i = f->size;\r | |
1040 | if (i != SIZEOF_LONG) {\r | |
1041 | if ((i == 2) && (x < -32768 || x > 32767))\r | |
1042 | return _range_error(f, 0);\r | |
1043 | #if (SIZEOF_LONG != 4)\r | |
1044 | else if ((i == 4) && (x < -2147483648L || x > 2147483647L))\r | |
1045 | return _range_error(f, 0);\r | |
1046 | #endif\r | |
1047 | }\r | |
1048 | do {\r | |
1049 | *p++ = (char)x;\r | |
1050 | x >>= 8;\r | |
1051 | } while (--i > 0);\r | |
1052 | return 0;\r | |
1053 | }\r | |
1054 | \r | |
1055 | static int\r | |
1056 | lp_uint(char *p, PyObject *v, const formatdef *f)\r | |
1057 | {\r | |
1058 | unsigned long x;\r | |
1059 | Py_ssize_t i;\r | |
1060 | if (get_ulong(v, &x) < 0)\r | |
1061 | return -1;\r | |
1062 | i = f->size;\r | |
1063 | if (i != SIZEOF_LONG) {\r | |
1064 | unsigned long maxint = 1;\r | |
1065 | maxint <<= (unsigned long)(i * 8);\r | |
1066 | if (x >= maxint)\r | |
1067 | return _range_error(f, 1);\r | |
1068 | }\r | |
1069 | do {\r | |
1070 | *p++ = (char)x;\r | |
1071 | x >>= 8;\r | |
1072 | } while (--i > 0);\r | |
1073 | return 0;\r | |
1074 | }\r | |
1075 | \r | |
1076 | static int\r | |
1077 | lp_longlong(char *p, PyObject *v, const formatdef *f)\r | |
1078 | {\r | |
1079 | int res;\r | |
1080 | v = get_pylong(v);\r | |
1081 | if (v == NULL)\r | |
1082 | return -1;\r | |
1083 | res = _PyLong_AsByteArray((PyLongObject*)v,\r | |
1084 | (unsigned char *)p,\r | |
1085 | 8,\r | |
1086 | 1, /* little_endian */\r | |
1087 | 1 /* signed */);\r | |
1088 | Py_DECREF(v);\r | |
1089 | return res;\r | |
1090 | }\r | |
1091 | \r | |
1092 | static int\r | |
1093 | lp_ulonglong(char *p, PyObject *v, const formatdef *f)\r | |
1094 | {\r | |
1095 | int res;\r | |
1096 | v = get_pylong(v);\r | |
1097 | if (v == NULL)\r | |
1098 | return -1;\r | |
1099 | res = _PyLong_AsByteArray((PyLongObject*)v,\r | |
1100 | (unsigned char *)p,\r | |
1101 | 8,\r | |
1102 | 1, /* little_endian */\r | |
1103 | 0 /* signed */);\r | |
1104 | Py_DECREF(v);\r | |
1105 | return res;\r | |
1106 | }\r | |
1107 | \r | |
1108 | static int\r | |
1109 | lp_float(char *p, PyObject *v, const formatdef *f)\r | |
1110 | {\r | |
1111 | double x = PyFloat_AsDouble(v);\r | |
1112 | if (x == -1 && PyErr_Occurred()) {\r | |
1113 | PyErr_SetString(StructError,\r | |
1114 | "required argument is not a float");\r | |
1115 | return -1;\r | |
1116 | }\r | |
1117 | return _PyFloat_Pack4(x, (unsigned char *)p, 1);\r | |
1118 | }\r | |
1119 | \r | |
1120 | static int\r | |
1121 | lp_double(char *p, PyObject *v, const formatdef *f)\r | |
1122 | {\r | |
1123 | double x = PyFloat_AsDouble(v);\r | |
1124 | if (x == -1 && PyErr_Occurred()) {\r | |
1125 | PyErr_SetString(StructError,\r | |
1126 | "required argument is not a float");\r | |
1127 | return -1;\r | |
1128 | }\r | |
1129 | return _PyFloat_Pack8(x, (unsigned char *)p, 1);\r | |
1130 | }\r | |
1131 | \r | |
1132 | static formatdef lilendian_table[] = {\r | |
1133 | {'x', 1, 0, NULL},\r | |
1134 | {'b', 1, 0, nu_byte, np_byte},\r | |
1135 | {'B', 1, 0, nu_ubyte, np_ubyte},\r | |
1136 | {'c', 1, 0, nu_char, np_char},\r | |
1137 | {'s', 1, 0, NULL},\r | |
1138 | {'p', 1, 0, NULL},\r | |
1139 | {'h', 2, 0, lu_int, lp_int},\r | |
1140 | {'H', 2, 0, lu_uint, lp_uint},\r | |
1141 | {'i', 4, 0, lu_int, lp_int},\r | |
1142 | {'I', 4, 0, lu_uint, lp_uint},\r | |
1143 | {'l', 4, 0, lu_int, lp_int},\r | |
1144 | {'L', 4, 0, lu_uint, lp_uint},\r | |
1145 | {'q', 8, 0, lu_longlong, lp_longlong},\r | |
1146 | {'Q', 8, 0, lu_ulonglong, lp_ulonglong},\r | |
1147 | {'?', 1, 0, bu_bool, bp_bool}, /* Std rep not endian dep,\r | |
1148 | but potentially different from native rep -- reuse bx_bool funcs. */\r | |
1149 | {'f', 4, 0, lu_float, lp_float},\r | |
1150 | {'d', 8, 0, lu_double, lp_double},\r | |
1151 | {0}\r | |
1152 | };\r | |
1153 | \r | |
1154 | \r | |
1155 | static const formatdef *\r | |
1156 | whichtable(char **pfmt)\r | |
1157 | {\r | |
1158 | const char *fmt = (*pfmt)++; /* May be backed out of later */\r | |
1159 | switch (*fmt) {\r | |
1160 | case '<':\r | |
1161 | return lilendian_table;\r | |
1162 | case '>':\r | |
1163 | case '!': /* Network byte order is big-endian */\r | |
1164 | return bigendian_table;\r | |
1165 | case '=': { /* Host byte order -- different from native in alignment! */\r | |
1166 | int n = 1;\r | |
1167 | char *p = (char *) &n;\r | |
1168 | if (*p == 1)\r | |
1169 | return lilendian_table;\r | |
1170 | else\r | |
1171 | return bigendian_table;\r | |
1172 | }\r | |
1173 | default:\r | |
1174 | --*pfmt; /* Back out of pointer increment */\r | |
1175 | /* Fall through */\r | |
1176 | case '@':\r | |
1177 | return native_table;\r | |
1178 | }\r | |
1179 | }\r | |
1180 | \r | |
1181 | \r | |
1182 | /* Get the table entry for a format code */\r | |
1183 | \r | |
1184 | static const formatdef *\r | |
1185 | getentry(int c, const formatdef *f)\r | |
1186 | {\r | |
1187 | for (; f->format != '\0'; f++) {\r | |
1188 | if (f->format == c) {\r | |
1189 | return f;\r | |
1190 | }\r | |
1191 | }\r | |
1192 | PyErr_SetString(StructError, "bad char in struct format");\r | |
1193 | return NULL;\r | |
1194 | }\r | |
1195 | \r | |
1196 | \r | |
1197 | /* Align a size according to a format code. Return -1 on overflow. */\r | |
1198 | \r | |
1199 | static Py_ssize_t\r | |
1200 | align(Py_ssize_t size, char c, const formatdef *e)\r | |
1201 | {\r | |
1202 | Py_ssize_t extra;\r | |
1203 | \r | |
1204 | if (e->format == c) {\r | |
1205 | if (e->alignment && size > 0) {\r | |
1206 | extra = (e->alignment - 1) - (size - 1) % (e->alignment);\r | |
1207 | if (extra > PY_SSIZE_T_MAX - size)\r | |
1208 | return -1;\r | |
1209 | size += extra;\r | |
1210 | }\r | |
1211 | }\r | |
1212 | return size;\r | |
1213 | }\r | |
1214 | \r | |
1215 | \r | |
1216 | /* calculate the size of a format string */\r | |
1217 | \r | |
1218 | static int\r | |
1219 | prepare_s(PyStructObject *self)\r | |
1220 | {\r | |
1221 | const formatdef *f;\r | |
1222 | const formatdef *e;\r | |
1223 | formatcode *codes;\r | |
1224 | \r | |
1225 | const char *s;\r | |
1226 | const char *fmt;\r | |
1227 | char c;\r | |
1228 | Py_ssize_t size, len, num, itemsize;\r | |
1229 | \r | |
1230 | fmt = PyString_AS_STRING(self->s_format);\r | |
1231 | \r | |
1232 | f = whichtable((char **)&fmt);\r | |
1233 | \r | |
1234 | s = fmt;\r | |
1235 | size = 0;\r | |
1236 | len = 0;\r | |
1237 | while ((c = *s++) != '\0') {\r | |
1238 | if (isspace(Py_CHARMASK(c)))\r | |
1239 | continue;\r | |
1240 | if ('0' <= c && c <= '9') {\r | |
1241 | num = c - '0';\r | |
1242 | while ('0' <= (c = *s++) && c <= '9') {\r | |
1243 | /* overflow-safe version of\r | |
1244 | if (num*10 + (c - '0') > PY_SSIZE_T_MAX) { ... } */\r | |
1245 | if (num >= PY_SSIZE_T_MAX / 10 && (\r | |
1246 | num > PY_SSIZE_T_MAX / 10 ||\r | |
1247 | (c - '0') > PY_SSIZE_T_MAX % 10))\r | |
1248 | goto overflow;\r | |
1249 | num = num*10 + (c - '0');\r | |
1250 | }\r | |
1251 | if (c == '\0')\r | |
1252 | break;\r | |
1253 | }\r | |
1254 | else\r | |
1255 | num = 1;\r | |
1256 | \r | |
1257 | e = getentry(c, f);\r | |
1258 | if (e == NULL)\r | |
1259 | return -1;\r | |
1260 | \r | |
1261 | switch (c) {\r | |
1262 | case 's': /* fall through */\r | |
1263 | case 'p': len++; break;\r | |
1264 | case 'x': break;\r | |
1265 | default: len += num; break;\r | |
1266 | }\r | |
1267 | \r | |
1268 | itemsize = e->size;\r | |
1269 | size = align(size, c, e);\r | |
1270 | if (size == -1)\r | |
1271 | goto overflow;\r | |
1272 | \r | |
1273 | /* if (size + num * itemsize > PY_SSIZE_T_MAX) { ... } */\r | |
1274 | if (num > (PY_SSIZE_T_MAX - size) / itemsize)\r | |
1275 | goto overflow;\r | |
1276 | size += num * itemsize;\r | |
1277 | }\r | |
1278 | \r | |
1279 | /* check for overflow */\r | |
1280 | if ((len + 1) > (PY_SSIZE_T_MAX / sizeof(formatcode))) {\r | |
1281 | PyErr_NoMemory();\r | |
1282 | return -1;\r | |
1283 | }\r | |
1284 | \r | |
1285 | self->s_size = size;\r | |
1286 | self->s_len = len;\r | |
1287 | codes = PyMem_MALLOC((len + 1) * sizeof(formatcode));\r | |
1288 | if (codes == NULL) {\r | |
1289 | PyErr_NoMemory();\r | |
1290 | return -1;\r | |
1291 | }\r | |
1292 | /* Free any s_codes value left over from a previous initialization. */\r | |
1293 | if (self->s_codes != NULL)\r | |
1294 | PyMem_FREE(self->s_codes);\r | |
1295 | self->s_codes = codes;\r | |
1296 | \r | |
1297 | s = fmt;\r | |
1298 | size = 0;\r | |
1299 | while ((c = *s++) != '\0') {\r | |
1300 | if (isspace(Py_CHARMASK(c)))\r | |
1301 | continue;\r | |
1302 | if ('0' <= c && c <= '9') {\r | |
1303 | num = c - '0';\r | |
1304 | while ('0' <= (c = *s++) && c <= '9')\r | |
1305 | num = num*10 + (c - '0');\r | |
1306 | if (c == '\0')\r | |
1307 | break;\r | |
1308 | }\r | |
1309 | else\r | |
1310 | num = 1;\r | |
1311 | \r | |
1312 | e = getentry(c, f);\r | |
1313 | \r | |
1314 | size = align(size, c, e);\r | |
1315 | if (c == 's' || c == 'p') {\r | |
1316 | codes->offset = size;\r | |
1317 | codes->size = num;\r | |
1318 | codes->fmtdef = e;\r | |
1319 | codes++;\r | |
1320 | size += num;\r | |
1321 | } else if (c == 'x') {\r | |
1322 | size += num;\r | |
1323 | } else {\r | |
1324 | while (--num >= 0) {\r | |
1325 | codes->offset = size;\r | |
1326 | codes->size = e->size;\r | |
1327 | codes->fmtdef = e;\r | |
1328 | codes++;\r | |
1329 | size += e->size;\r | |
1330 | }\r | |
1331 | }\r | |
1332 | }\r | |
1333 | codes->fmtdef = NULL;\r | |
1334 | codes->offset = size;\r | |
1335 | codes->size = 0;\r | |
1336 | \r | |
1337 | return 0;\r | |
1338 | \r | |
1339 | overflow:\r | |
1340 | PyErr_SetString(StructError,\r | |
1341 | "total struct size too long");\r | |
1342 | return -1;\r | |
1343 | }\r | |
1344 | \r | |
1345 | static PyObject *\r | |
1346 | s_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\r | |
1347 | {\r | |
1348 | PyObject *self;\r | |
1349 | \r | |
1350 | assert(type != NULL && type->tp_alloc != NULL);\r | |
1351 | \r | |
1352 | self = type->tp_alloc(type, 0);\r | |
1353 | if (self != NULL) {\r | |
1354 | PyStructObject *s = (PyStructObject*)self;\r | |
1355 | Py_INCREF(Py_None);\r | |
1356 | s->s_format = Py_None;\r | |
1357 | s->s_codes = NULL;\r | |
1358 | s->s_size = -1;\r | |
1359 | s->s_len = -1;\r | |
1360 | }\r | |
1361 | return self;\r | |
1362 | }\r | |
1363 | \r | |
1364 | static int\r | |
1365 | s_init(PyObject *self, PyObject *args, PyObject *kwds)\r | |
1366 | {\r | |
1367 | PyStructObject *soself = (PyStructObject *)self;\r | |
1368 | PyObject *o_format = NULL;\r | |
1369 | int ret = 0;\r | |
1370 | static char *kwlist[] = {"format", 0};\r | |
1371 | \r | |
1372 | assert(PyStruct_Check(self));\r | |
1373 | \r | |
1374 | if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:Struct", kwlist,\r | |
1375 | &o_format))\r | |
1376 | return -1;\r | |
1377 | \r | |
1378 | if (PyString_Check(o_format)) {\r | |
1379 | Py_INCREF(o_format);\r | |
1380 | Py_CLEAR(soself->s_format);\r | |
1381 | soself->s_format = o_format;\r | |
1382 | }\r | |
1383 | else if (PyUnicode_Check(o_format)) {\r | |
1384 | PyObject *str = PyUnicode_AsEncodedString(o_format, "ascii", NULL);\r | |
1385 | if (str == NULL)\r | |
1386 | return -1;\r | |
1387 | Py_CLEAR(soself->s_format);\r | |
1388 | soself->s_format = str;\r | |
1389 | }\r | |
1390 | else {\r | |
1391 | PyErr_Format(PyExc_TypeError,\r | |
1392 | "Struct() argument 1 must be string, not %s",\r | |
1393 | Py_TYPE(o_format)->tp_name);\r | |
1394 | return -1;\r | |
1395 | }\r | |
1396 | \r | |
1397 | ret = prepare_s(soself);\r | |
1398 | return ret;\r | |
1399 | }\r | |
1400 | \r | |
1401 | static void\r | |
1402 | s_dealloc(PyStructObject *s)\r | |
1403 | {\r | |
1404 | if (s->weakreflist != NULL)\r | |
1405 | PyObject_ClearWeakRefs((PyObject *)s);\r | |
1406 | if (s->s_codes != NULL) {\r | |
1407 | PyMem_FREE(s->s_codes);\r | |
1408 | }\r | |
1409 | Py_XDECREF(s->s_format);\r | |
1410 | Py_TYPE(s)->tp_free((PyObject *)s);\r | |
1411 | }\r | |
1412 | \r | |
1413 | static PyObject *\r | |
1414 | s_unpack_internal(PyStructObject *soself, char *startfrom) {\r | |
1415 | formatcode *code;\r | |
1416 | Py_ssize_t i = 0;\r | |
1417 | PyObject *result = PyTuple_New(soself->s_len);\r | |
1418 | if (result == NULL)\r | |
1419 | return NULL;\r | |
1420 | \r | |
1421 | for (code = soself->s_codes; code->fmtdef != NULL; code++) {\r | |
1422 | PyObject *v;\r | |
1423 | const formatdef *e = code->fmtdef;\r | |
1424 | const char *res = startfrom + code->offset;\r | |
1425 | if (e->format == 's') {\r | |
1426 | v = PyString_FromStringAndSize(res, code->size);\r | |
1427 | } else if (e->format == 'p') {\r | |
1428 | Py_ssize_t n = *(unsigned char*)res;\r | |
1429 | if (n >= code->size)\r | |
1430 | n = code->size - 1;\r | |
1431 | v = PyString_FromStringAndSize(res + 1, n);\r | |
1432 | } else {\r | |
1433 | v = e->unpack(res, e);\r | |
1434 | }\r | |
1435 | if (v == NULL)\r | |
1436 | goto fail;\r | |
1437 | PyTuple_SET_ITEM(result, i++, v);\r | |
1438 | }\r | |
1439 | \r | |
1440 | return result;\r | |
1441 | fail:\r | |
1442 | Py_DECREF(result);\r | |
1443 | return NULL;\r | |
1444 | }\r | |
1445 | \r | |
1446 | \r | |
1447 | PyDoc_STRVAR(s_unpack__doc__,\r | |
1448 | "S.unpack(str) -> (v1, v2, ...)\n\\r | |
1449 | \n\\r | |
1450 | Return tuple containing values unpacked according to this Struct's format.\n\\r | |
1451 | Requires len(str) == self.size. See struct.__doc__ for more on format\n\\r | |
1452 | strings.");\r | |
1453 | \r | |
1454 | static PyObject *\r | |
1455 | s_unpack(PyObject *self, PyObject *inputstr)\r | |
1456 | {\r | |
1457 | Py_buffer buf;\r | |
1458 | char *start;\r | |
1459 | Py_ssize_t len;\r | |
1460 | PyObject *args=NULL, *result;\r | |
1461 | PyStructObject *soself = (PyStructObject *)self;\r | |
1462 | assert(PyStruct_Check(self));\r | |
1463 | assert(soself->s_codes != NULL);\r | |
1464 | if (inputstr == NULL)\r | |
1465 | goto fail;\r | |
1466 | if (PyString_Check(inputstr) &&\r | |
1467 | PyString_GET_SIZE(inputstr) == soself->s_size) {\r | |
1468 | return s_unpack_internal(soself, PyString_AS_STRING(inputstr));\r | |
1469 | }\r | |
1470 | args = PyTuple_Pack(1, inputstr);\r | |
1471 | if (args == NULL)\r | |
1472 | return NULL;\r | |
1473 | if (!PyArg_ParseTuple(args, "s*:unpack", &buf))\r | |
1474 | goto fail;\r | |
1475 | start = buf.buf;\r | |
1476 | len = buf.len;\r | |
1477 | if (soself->s_size != len) {\r | |
1478 | PyBuffer_Release(&buf);\r | |
1479 | goto fail;\r | |
1480 | }\r | |
1481 | result = s_unpack_internal(soself, start);\r | |
1482 | Py_DECREF(args);\r | |
1483 | PyBuffer_Release(&buf);\r | |
1484 | return result;\r | |
1485 | \r | |
1486 | fail:\r | |
1487 | Py_XDECREF(args);\r | |
1488 | PyErr_Format(StructError,\r | |
1489 | "unpack requires a string argument of length %zd",\r | |
1490 | soself->s_size);\r | |
1491 | return NULL;\r | |
1492 | }\r | |
1493 | \r | |
1494 | PyDoc_STRVAR(s_unpack_from__doc__,\r | |
1495 | "S.unpack_from(buffer[, offset]) -> (v1, v2, ...)\n\\r | |
1496 | \n\\r | |
1497 | Return tuple containing values unpacked according to this Struct's format.\n\\r | |
1498 | Unlike unpack, unpack_from can unpack values from any object supporting\n\\r | |
1499 | the buffer API, not just str. Requires len(buffer[offset:]) >= self.size.\n\\r | |
1500 | See struct.__doc__ for more on format strings.");\r | |
1501 | \r | |
1502 | static PyObject *\r | |
1503 | s_unpack_from(PyObject *self, PyObject *args, PyObject *kwds)\r | |
1504 | {\r | |
1505 | static char *kwlist[] = {"buffer", "offset", 0};\r | |
1506 | static char *fmt = "z*|n:unpack_from";\r | |
1507 | Py_buffer buf;\r | |
1508 | Py_ssize_t buffer_len = 0, offset = 0;\r | |
1509 | char *buffer = NULL;\r | |
1510 | PyStructObject *soself = (PyStructObject *)self;\r | |
1511 | PyObject *result;\r | |
1512 | assert(PyStruct_Check(self));\r | |
1513 | assert(soself->s_codes != NULL);\r | |
1514 | \r | |
1515 | if (!PyArg_ParseTupleAndKeywords(args, kwds, fmt, kwlist,\r | |
1516 | &buf, &offset))\r | |
1517 | return NULL;\r | |
1518 | buffer = buf.buf;\r | |
1519 | buffer_len = buf.len;\r | |
1520 | if (buffer == NULL) {\r | |
1521 | PyErr_Format(StructError,\r | |
1522 | "unpack_from requires a buffer argument");\r | |
1523 | PyBuffer_Release(&buf);\r | |
1524 | return NULL;\r | |
1525 | }\r | |
1526 | \r | |
1527 | if (offset < 0)\r | |
1528 | offset += buffer_len;\r | |
1529 | \r | |
1530 | if (offset < 0 || (buffer_len - offset) < soself->s_size) {\r | |
1531 | PyErr_Format(StructError,\r | |
1532 | "unpack_from requires a buffer of at least %zd bytes",\r | |
1533 | soself->s_size);\r | |
1534 | PyBuffer_Release(&buf);\r | |
1535 | return NULL;\r | |
1536 | }\r | |
1537 | result = s_unpack_internal(soself, buffer + offset);\r | |
1538 | PyBuffer_Release(&buf);\r | |
1539 | return result;\r | |
1540 | }\r | |
1541 | \r | |
1542 | \r | |
1543 | /*\r | |
1544 | * Guts of the pack function.\r | |
1545 | *\r | |
1546 | * Takes a struct object, a tuple of arguments, and offset in that tuple of\r | |
1547 | * argument for where to start processing the arguments for packing, and a\r | |
1548 | * character buffer for writing the packed string. The caller must insure\r | |
1549 | * that the buffer may contain the required length for packing the arguments.\r | |
1550 | * 0 is returned on success, 1 is returned if there is an error.\r | |
1551 | *\r | |
1552 | */\r | |
1553 | static int\r | |
1554 | s_pack_internal(PyStructObject *soself, PyObject *args, int offset, char* buf)\r | |
1555 | {\r | |
1556 | formatcode *code;\r | |
1557 | /* XXX(nnorwitz): why does i need to be a local? can we use\r | |
1558 | the offset parameter or do we need the wider width? */\r | |
1559 | Py_ssize_t i;\r | |
1560 | \r | |
1561 | memset(buf, '\0', soself->s_size);\r | |
1562 | i = offset;\r | |
1563 | for (code = soself->s_codes; code->fmtdef != NULL; code++) {\r | |
1564 | Py_ssize_t n;\r | |
1565 | PyObject *v = PyTuple_GET_ITEM(args, i++);\r | |
1566 | const formatdef *e = code->fmtdef;\r | |
1567 | char *res = buf + code->offset;\r | |
1568 | if (e->format == 's') {\r | |
1569 | if (!PyString_Check(v)) {\r | |
1570 | PyErr_SetString(StructError,\r | |
1571 | "argument for 's' must "\r | |
1572 | "be a string");\r | |
1573 | return -1;\r | |
1574 | }\r | |
1575 | n = PyString_GET_SIZE(v);\r | |
1576 | if (n > code->size)\r | |
1577 | n = code->size;\r | |
1578 | if (n > 0)\r | |
1579 | memcpy(res, PyString_AS_STRING(v), n);\r | |
1580 | } else if (e->format == 'p') {\r | |
1581 | if (!PyString_Check(v)) {\r | |
1582 | PyErr_SetString(StructError,\r | |
1583 | "argument for 'p' must "\r | |
1584 | "be a string");\r | |
1585 | return -1;\r | |
1586 | }\r | |
1587 | n = PyString_GET_SIZE(v);\r | |
1588 | if (n > (code->size - 1))\r | |
1589 | n = code->size - 1;\r | |
1590 | if (n > 0)\r | |
1591 | memcpy(res + 1, PyString_AS_STRING(v), n);\r | |
1592 | if (n > 255)\r | |
1593 | n = 255;\r | |
1594 | *res = Py_SAFE_DOWNCAST(n, Py_ssize_t, unsigned char);\r | |
1595 | } else if (e->pack(res, v, e) < 0) {\r | |
1596 | if (strchr(integer_codes, e->format) != NULL &&\r | |
1597 | PyErr_ExceptionMatches(PyExc_OverflowError))\r | |
1598 | PyErr_Format(StructError,\r | |
1599 | "integer out of range for "\r | |
1600 | "'%c' format code",\r | |
1601 | e->format);\r | |
1602 | return -1;\r | |
1603 | }\r | |
1604 | }\r | |
1605 | \r | |
1606 | /* Success */\r | |
1607 | return 0;\r | |
1608 | }\r | |
1609 | \r | |
1610 | \r | |
1611 | PyDoc_STRVAR(s_pack__doc__,\r | |
1612 | "S.pack(v1, v2, ...) -> string\n\\r | |
1613 | \n\\r | |
1614 | Return a string containing values v1, v2, ... packed according to this\n\\r | |
1615 | Struct's format. See struct.__doc__ for more on format strings.");\r | |
1616 | \r | |
1617 | static PyObject *\r | |
1618 | s_pack(PyObject *self, PyObject *args)\r | |
1619 | {\r | |
1620 | PyStructObject *soself;\r | |
1621 | PyObject *result;\r | |
1622 | \r | |
1623 | /* Validate arguments. */\r | |
1624 | soself = (PyStructObject *)self;\r | |
1625 | assert(PyStruct_Check(self));\r | |
1626 | assert(soself->s_codes != NULL);\r | |
1627 | if (PyTuple_GET_SIZE(args) != soself->s_len)\r | |
1628 | {\r | |
1629 | PyErr_Format(StructError,\r | |
1630 | "pack expected %zd items for packing (got %zd)", soself->s_len, PyTuple_GET_SIZE(args));\r | |
1631 | return NULL;\r | |
1632 | }\r | |
1633 | \r | |
1634 | /* Allocate a new string */\r | |
1635 | result = PyString_FromStringAndSize((char *)NULL, soself->s_size);\r | |
1636 | if (result == NULL)\r | |
1637 | return NULL;\r | |
1638 | \r | |
1639 | /* Call the guts */\r | |
1640 | if ( s_pack_internal(soself, args, 0, PyString_AS_STRING(result)) != 0 ) {\r | |
1641 | Py_DECREF(result);\r | |
1642 | return NULL;\r | |
1643 | }\r | |
1644 | \r | |
1645 | return result;\r | |
1646 | }\r | |
1647 | \r | |
1648 | PyDoc_STRVAR(s_pack_into__doc__,\r | |
1649 | "S.pack_into(buffer, offset, v1, v2, ...)\n\\r | |
1650 | \n\\r | |
1651 | Pack the values v1, v2, ... according to this Struct's format, write \n\\r | |
1652 | the packed bytes into the writable buffer buf starting at offset. Note\n\\r | |
1653 | that the offset is not an optional argument. See struct.__doc__ for \n\\r | |
1654 | more on format strings.");\r | |
1655 | \r | |
1656 | static PyObject *\r | |
1657 | s_pack_into(PyObject *self, PyObject *args)\r | |
1658 | {\r | |
1659 | PyStructObject *soself;\r | |
1660 | Py_buffer buf;\r | |
1661 | Py_ssize_t offset;\r | |
1662 | \r | |
1663 | /* Validate arguments. +1 is for the first arg as buffer. */\r | |
1664 | soself = (PyStructObject *)self;\r | |
1665 | assert(PyStruct_Check(self));\r | |
1666 | assert(soself->s_codes != NULL);\r | |
1667 | if (PyTuple_GET_SIZE(args) != (soself->s_len + 2))\r | |
1668 | {\r | |
1669 | if (PyTuple_GET_SIZE(args) == 0) {\r | |
1670 | PyErr_Format(StructError,\r | |
1671 | "pack_into expected buffer argument");\r | |
1672 | }\r | |
1673 | else if (PyTuple_GET_SIZE(args) == 1) {\r | |
1674 | PyErr_Format(StructError,\r | |
1675 | "pack_into expected offset argument");\r | |
1676 | }\r | |
1677 | else {\r | |
1678 | PyErr_Format(StructError,\r | |
1679 | "pack_into expected %zd items for packing (got %zd)",\r | |
1680 | soself->s_len, (PyTuple_GET_SIZE(args) - 2));\r | |
1681 | }\r | |
1682 | return NULL;\r | |
1683 | }\r | |
1684 | \r | |
1685 | /* Extract a writable memory buffer from the first argument */\r | |
1686 | if (!PyArg_Parse(PyTuple_GET_ITEM(args, 0), "w*", &buf))\r | |
1687 | return NULL;\r | |
1688 | \r | |
1689 | /* Extract the offset from the first argument */\r | |
1690 | offset = PyInt_AsSsize_t(PyTuple_GET_ITEM(args, 1));\r | |
1691 | if (offset == -1 && PyErr_Occurred()) {\r | |
1692 | PyBuffer_Release(&buf);\r | |
1693 | return NULL;\r | |
1694 | }\r | |
1695 | \r | |
1696 | /* Support negative offsets. */\r | |
1697 | if (offset < 0)\r | |
1698 | offset += buf.len;\r | |
1699 | \r | |
1700 | /* Check boundaries */\r | |
1701 | if (offset < 0 || (buf.len - offset) < soself->s_size) {\r | |
1702 | PyErr_Format(StructError,\r | |
1703 | "pack_into requires a buffer of at least %zd bytes",\r | |
1704 | soself->s_size);\r | |
1705 | PyBuffer_Release(&buf);\r | |
1706 | return NULL;\r | |
1707 | }\r | |
1708 | \r | |
1709 | /* Call the guts */\r | |
1710 | if (s_pack_internal(soself, args, 2, (char *)buf.buf + offset) != 0) {\r | |
1711 | PyBuffer_Release(&buf);\r | |
1712 | return NULL;\r | |
1713 | }\r | |
1714 | PyBuffer_Release(&buf);\r | |
1715 | \r | |
1716 | Py_RETURN_NONE;\r | |
1717 | }\r | |
1718 | \r | |
1719 | static PyObject *\r | |
1720 | s_get_format(PyStructObject *self, void *unused)\r | |
1721 | {\r | |
1722 | Py_INCREF(self->s_format);\r | |
1723 | return self->s_format;\r | |
1724 | }\r | |
1725 | \r | |
1726 | static PyObject *\r | |
1727 | s_get_size(PyStructObject *self, void *unused)\r | |
1728 | {\r | |
1729 | return PyInt_FromSsize_t(self->s_size);\r | |
1730 | }\r | |
1731 | \r | |
1732 | PyDoc_STRVAR(s_sizeof__doc__,\r | |
1733 | "S.__sizeof__() -> size of S in memory, in bytes");\r | |
1734 | \r | |
1735 | static PyObject *\r | |
1736 | s_sizeof(PyStructObject *self, void *unused)\r | |
1737 | {\r | |
1738 | Py_ssize_t size;\r | |
1739 | \r | |
1740 | size = sizeof(PyStructObject) + sizeof(formatcode) * (self->s_len + 1);\r | |
1741 | return PyLong_FromSsize_t(size);\r | |
1742 | }\r | |
1743 | \r | |
1744 | /* List of functions */\r | |
1745 | \r | |
1746 | static struct PyMethodDef s_methods[] = {\r | |
1747 | {"pack", s_pack, METH_VARARGS, s_pack__doc__},\r | |
1748 | {"pack_into", s_pack_into, METH_VARARGS, s_pack_into__doc__},\r | |
1749 | {"unpack", s_unpack, METH_O, s_unpack__doc__},\r | |
1750 | {"unpack_from", (PyCFunction)s_unpack_from, METH_VARARGS|METH_KEYWORDS,\r | |
1751 | s_unpack_from__doc__},\r | |
1752 | {"__sizeof__", (PyCFunction)s_sizeof, METH_NOARGS, s_sizeof__doc__},\r | |
1753 | {NULL, NULL} /* sentinel */\r | |
1754 | };\r | |
1755 | \r | |
1756 | PyDoc_STRVAR(s__doc__, "Compiled struct object");\r | |
1757 | \r | |
1758 | #define OFF(x) offsetof(PyStructObject, x)\r | |
1759 | \r | |
1760 | static PyGetSetDef s_getsetlist[] = {\r | |
1761 | {"format", (getter)s_get_format, (setter)NULL, "struct format string", NULL},\r | |
1762 | {"size", (getter)s_get_size, (setter)NULL, "struct size in bytes", NULL},\r | |
1763 | {NULL} /* sentinel */\r | |
1764 | };\r | |
1765 | \r | |
1766 | static\r | |
1767 | PyTypeObject PyStructType = {\r | |
1768 | PyVarObject_HEAD_INIT(NULL, 0)\r | |
1769 | "Struct",\r | |
1770 | sizeof(PyStructObject),\r | |
1771 | 0,\r | |
1772 | (destructor)s_dealloc, /* tp_dealloc */\r | |
1773 | 0, /* tp_print */\r | |
1774 | 0, /* tp_getattr */\r | |
1775 | 0, /* tp_setattr */\r | |
1776 | 0, /* tp_compare */\r | |
1777 | 0, /* tp_repr */\r | |
1778 | 0, /* tp_as_number */\r | |
1779 | 0, /* tp_as_sequence */\r | |
1780 | 0, /* tp_as_mapping */\r | |
1781 | 0, /* tp_hash */\r | |
1782 | 0, /* tp_call */\r | |
1783 | 0, /* tp_str */\r | |
1784 | PyObject_GenericGetAttr, /* tp_getattro */\r | |
1785 | PyObject_GenericSetAttr, /* tp_setattro */\r | |
1786 | 0, /* tp_as_buffer */\r | |
1787 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_WEAKREFS,/* tp_flags */\r | |
1788 | s__doc__, /* tp_doc */\r | |
1789 | 0, /* tp_traverse */\r | |
1790 | 0, /* tp_clear */\r | |
1791 | 0, /* tp_richcompare */\r | |
1792 | offsetof(PyStructObject, weakreflist), /* tp_weaklistoffset */\r | |
1793 | 0, /* tp_iter */\r | |
1794 | 0, /* tp_iternext */\r | |
1795 | s_methods, /* tp_methods */\r | |
1796 | NULL, /* tp_members */\r | |
1797 | s_getsetlist, /* tp_getset */\r | |
1798 | 0, /* tp_base */\r | |
1799 | 0, /* tp_dict */\r | |
1800 | 0, /* tp_descr_get */\r | |
1801 | 0, /* tp_descr_set */\r | |
1802 | 0, /* tp_dictoffset */\r | |
1803 | s_init, /* tp_init */\r | |
1804 | PyType_GenericAlloc,/* tp_alloc */\r | |
1805 | s_new, /* tp_new */\r | |
1806 | PyObject_Del, /* tp_free */\r | |
1807 | };\r | |
1808 | \r | |
1809 | \r | |
1810 | /* ---- Standalone functions ---- */\r | |
1811 | \r | |
1812 | #define MAXCACHE 100\r | |
1813 | static PyObject *cache = NULL;\r | |
1814 | \r | |
1815 | static PyObject *\r | |
1816 | cache_struct(PyObject *fmt)\r | |
1817 | {\r | |
1818 | PyObject * s_object;\r | |
1819 | \r | |
1820 | if (cache == NULL) {\r | |
1821 | cache = PyDict_New();\r | |
1822 | if (cache == NULL)\r | |
1823 | return NULL;\r | |
1824 | }\r | |
1825 | \r | |
1826 | s_object = PyDict_GetItem(cache, fmt);\r | |
1827 | if (s_object != NULL) {\r | |
1828 | Py_INCREF(s_object);\r | |
1829 | return s_object;\r | |
1830 | }\r | |
1831 | \r | |
1832 | s_object = PyObject_CallFunctionObjArgs((PyObject *)(&PyStructType), fmt, NULL);\r | |
1833 | if (s_object != NULL) {\r | |
1834 | if (PyDict_Size(cache) >= MAXCACHE)\r | |
1835 | PyDict_Clear(cache);\r | |
1836 | /* Attempt to cache the result */\r | |
1837 | if (PyDict_SetItem(cache, fmt, s_object) == -1)\r | |
1838 | PyErr_Clear();\r | |
1839 | }\r | |
1840 | return s_object;\r | |
1841 | }\r | |
1842 | \r | |
1843 | PyDoc_STRVAR(clearcache_doc,\r | |
1844 | "Clear the internal cache.");\r | |
1845 | \r | |
1846 | static PyObject *\r | |
1847 | clearcache(PyObject *self)\r | |
1848 | {\r | |
1849 | Py_CLEAR(cache);\r | |
1850 | Py_RETURN_NONE;\r | |
1851 | }\r | |
1852 | \r | |
1853 | PyDoc_STRVAR(calcsize_doc,\r | |
1854 | "Return size of C struct described by format string fmt.");\r | |
1855 | \r | |
1856 | static PyObject *\r | |
1857 | calcsize(PyObject *self, PyObject *fmt)\r | |
1858 | {\r | |
1859 | Py_ssize_t n;\r | |
1860 | PyObject *s_object = cache_struct(fmt);\r | |
1861 | if (s_object == NULL)\r | |
1862 | return NULL;\r | |
1863 | n = ((PyStructObject *)s_object)->s_size;\r | |
1864 | Py_DECREF(s_object);\r | |
1865 | return PyInt_FromSsize_t(n);\r | |
1866 | }\r | |
1867 | \r | |
1868 | PyDoc_STRVAR(pack_doc,\r | |
1869 | "Return string containing values v1, v2, ... packed according to fmt.");\r | |
1870 | \r | |
1871 | static PyObject *\r | |
1872 | pack(PyObject *self, PyObject *args)\r | |
1873 | {\r | |
1874 | PyObject *s_object, *fmt, *newargs, *result;\r | |
1875 | Py_ssize_t n = PyTuple_GET_SIZE(args);\r | |
1876 | \r | |
1877 | if (n == 0) {\r | |
1878 | PyErr_SetString(PyExc_TypeError, "missing format argument");\r | |
1879 | return NULL;\r | |
1880 | }\r | |
1881 | fmt = PyTuple_GET_ITEM(args, 0);\r | |
1882 | newargs = PyTuple_GetSlice(args, 1, n);\r | |
1883 | if (newargs == NULL)\r | |
1884 | return NULL;\r | |
1885 | \r | |
1886 | s_object = cache_struct(fmt);\r | |
1887 | if (s_object == NULL) {\r | |
1888 | Py_DECREF(newargs);\r | |
1889 | return NULL;\r | |
1890 | }\r | |
1891 | result = s_pack(s_object, newargs);\r | |
1892 | Py_DECREF(newargs);\r | |
1893 | Py_DECREF(s_object);\r | |
1894 | return result;\r | |
1895 | }\r | |
1896 | \r | |
1897 | PyDoc_STRVAR(pack_into_doc,\r | |
1898 | "Pack the values v1, v2, ... according to fmt.\n\\r | |
1899 | Write the packed bytes into the writable buffer buf starting at offset.");\r | |
1900 | \r | |
1901 | static PyObject *\r | |
1902 | pack_into(PyObject *self, PyObject *args)\r | |
1903 | {\r | |
1904 | PyObject *s_object, *fmt, *newargs, *result;\r | |
1905 | Py_ssize_t n = PyTuple_GET_SIZE(args);\r | |
1906 | \r | |
1907 | if (n == 0) {\r | |
1908 | PyErr_SetString(PyExc_TypeError, "missing format argument");\r | |
1909 | return NULL;\r | |
1910 | }\r | |
1911 | fmt = PyTuple_GET_ITEM(args, 0);\r | |
1912 | newargs = PyTuple_GetSlice(args, 1, n);\r | |
1913 | if (newargs == NULL)\r | |
1914 | return NULL;\r | |
1915 | \r | |
1916 | s_object = cache_struct(fmt);\r | |
1917 | if (s_object == NULL) {\r | |
1918 | Py_DECREF(newargs);\r | |
1919 | return NULL;\r | |
1920 | }\r | |
1921 | result = s_pack_into(s_object, newargs);\r | |
1922 | Py_DECREF(newargs);\r | |
1923 | Py_DECREF(s_object);\r | |
1924 | return result;\r | |
1925 | }\r | |
1926 | \r | |
1927 | PyDoc_STRVAR(unpack_doc,\r | |
1928 | "Unpack the string containing packed C structure data, according to fmt.\n\\r | |
1929 | Requires len(string) == calcsize(fmt).");\r | |
1930 | \r | |
1931 | static PyObject *\r | |
1932 | unpack(PyObject *self, PyObject *args)\r | |
1933 | {\r | |
1934 | PyObject *s_object, *fmt, *inputstr, *result;\r | |
1935 | \r | |
1936 | if (!PyArg_UnpackTuple(args, "unpack", 2, 2, &fmt, &inputstr))\r | |
1937 | return NULL;\r | |
1938 | \r | |
1939 | s_object = cache_struct(fmt);\r | |
1940 | if (s_object == NULL)\r | |
1941 | return NULL;\r | |
1942 | result = s_unpack(s_object, inputstr);\r | |
1943 | Py_DECREF(s_object);\r | |
1944 | return result;\r | |
1945 | }\r | |
1946 | \r | |
1947 | PyDoc_STRVAR(unpack_from_doc,\r | |
1948 | "Unpack the buffer, containing packed C structure data, according to\n\\r | |
1949 | fmt, starting at offset. Requires len(buffer[offset:]) >= calcsize(fmt).");\r | |
1950 | \r | |
1951 | static PyObject *\r | |
1952 | unpack_from(PyObject *self, PyObject *args, PyObject *kwds)\r | |
1953 | {\r | |
1954 | PyObject *s_object, *fmt, *newargs, *result;\r | |
1955 | Py_ssize_t n = PyTuple_GET_SIZE(args);\r | |
1956 | \r | |
1957 | if (n == 0) {\r | |
1958 | PyErr_SetString(PyExc_TypeError, "missing format argument");\r | |
1959 | return NULL;\r | |
1960 | }\r | |
1961 | fmt = PyTuple_GET_ITEM(args, 0);\r | |
1962 | newargs = PyTuple_GetSlice(args, 1, n);\r | |
1963 | if (newargs == NULL)\r | |
1964 | return NULL;\r | |
1965 | \r | |
1966 | s_object = cache_struct(fmt);\r | |
1967 | if (s_object == NULL) {\r | |
1968 | Py_DECREF(newargs);\r | |
1969 | return NULL;\r | |
1970 | }\r | |
1971 | result = s_unpack_from(s_object, newargs, kwds);\r | |
1972 | Py_DECREF(newargs);\r | |
1973 | Py_DECREF(s_object);\r | |
1974 | return result;\r | |
1975 | }\r | |
1976 | \r | |
1977 | static struct PyMethodDef module_functions[] = {\r | |
1978 | {"_clearcache", (PyCFunction)clearcache, METH_NOARGS, clearcache_doc},\r | |
1979 | {"calcsize", calcsize, METH_O, calcsize_doc},\r | |
1980 | {"pack", pack, METH_VARARGS, pack_doc},\r | |
1981 | {"pack_into", pack_into, METH_VARARGS, pack_into_doc},\r | |
1982 | {"unpack", unpack, METH_VARARGS, unpack_doc},\r | |
1983 | {"unpack_from", (PyCFunction)unpack_from,\r | |
1984 | METH_VARARGS|METH_KEYWORDS, unpack_from_doc},\r | |
1985 | {NULL, NULL} /* sentinel */\r | |
1986 | };\r | |
1987 | \r | |
1988 | \r | |
1989 | /* Module initialization */\r | |
1990 | \r | |
1991 | PyDoc_STRVAR(module_doc,\r | |
1992 | "Functions to convert between Python values and C structs represented\n\\r | |
1993 | as Python strings. It uses format strings (explained below) as compact\n\\r | |
1994 | descriptions of the lay-out of the C structs and the intended conversion\n\\r | |
1995 | to/from Python values.\n\\r | |
1996 | \n\\r | |
1997 | The optional first format char indicates byte order, size and alignment:\n\\r | |
1998 | @: native order, size & alignment (default)\n\\r | |
1999 | =: native order, std. size & alignment\n\\r | |
2000 | <: little-endian, std. size & alignment\n\\r | |
2001 | >: big-endian, std. size & alignment\n\\r | |
2002 | !: same as >\n\\r | |
2003 | \n\\r | |
2004 | The remaining chars indicate types of args and must match exactly;\n\\r | |
2005 | these can be preceded by a decimal repeat count:\n\\r | |
2006 | x: pad byte (no data); c:char; b:signed byte; B:unsigned byte;\n\\r | |
2007 | ?: _Bool (requires C99; if not available, char is used instead)\n\\r | |
2008 | h:short; H:unsigned short; i:int; I:unsigned int;\n\\r | |
2009 | l:long; L:unsigned long; f:float; d:double.\n\\r | |
2010 | Special cases (preceding decimal count indicates length):\n\\r | |
2011 | s:string (array of char); p: pascal string (with count byte).\n\\r | |
2012 | Special case (only available in native format):\n\\r | |
2013 | P:an integer type that is wide enough to hold a pointer.\n\\r | |
2014 | Special case (not in native mode unless 'long long' in platform C):\n\\r | |
2015 | q:long long; Q:unsigned long long\n\\r | |
2016 | Whitespace between formats is ignored.\n\\r | |
2017 | \n\\r | |
2018 | The variable struct.error is an exception raised on errors.\n");\r | |
2019 | \r | |
2020 | PyMODINIT_FUNC\r | |
2021 | init_struct(void)\r | |
2022 | {\r | |
2023 | PyObject *ver, *m;\r | |
2024 | \r | |
2025 | ver = PyString_FromString("0.2");\r | |
2026 | if (ver == NULL)\r | |
2027 | return;\r | |
2028 | \r | |
2029 | m = Py_InitModule3("_struct", module_functions, module_doc);\r | |
2030 | if (m == NULL)\r | |
2031 | return;\r | |
2032 | \r | |
2033 | Py_TYPE(&PyStructType) = &PyType_Type;\r | |
2034 | if (PyType_Ready(&PyStructType) < 0)\r | |
2035 | return;\r | |
2036 | \r | |
2037 | /* This speed trick can't be used until overflow masking goes\r | |
2038 | away, because native endian always raises exceptions\r | |
2039 | instead of overflow masking. */\r | |
2040 | \r | |
2041 | /* Check endian and swap in faster functions */\r | |
2042 | {\r | |
2043 | int one = 1;\r | |
2044 | formatdef *native = native_table;\r | |
2045 | formatdef *other, *ptr;\r | |
2046 | if ((int)*(unsigned char*)&one)\r | |
2047 | other = lilendian_table;\r | |
2048 | else\r | |
2049 | other = bigendian_table;\r | |
2050 | /* Scan through the native table, find a matching\r | |
2051 | entry in the endian table and swap in the\r | |
2052 | native implementations whenever possible\r | |
2053 | (64-bit platforms may not have "standard" sizes) */\r | |
2054 | while (native->format != '\0' && other->format != '\0') {\r | |
2055 | ptr = other;\r | |
2056 | while (ptr->format != '\0') {\r | |
2057 | if (ptr->format == native->format) {\r | |
2058 | /* Match faster when formats are\r | |
2059 | listed in the same order */\r | |
2060 | if (ptr == other)\r | |
2061 | other++;\r | |
2062 | /* Only use the trick if the\r | |
2063 | size matches */\r | |
2064 | if (ptr->size != native->size)\r | |
2065 | break;\r | |
2066 | /* Skip float and double, could be\r | |
2067 | "unknown" float format */\r | |
2068 | if (ptr->format == 'd' || ptr->format == 'f')\r | |
2069 | break;\r | |
2070 | ptr->pack = native->pack;\r | |
2071 | ptr->unpack = native->unpack;\r | |
2072 | break;\r | |
2073 | }\r | |
2074 | ptr++;\r | |
2075 | }\r | |
2076 | native++;\r | |
2077 | }\r | |
2078 | }\r | |
2079 | \r | |
2080 | /* Add some symbolic constants to the module */\r | |
2081 | if (StructError == NULL) {\r | |
2082 | StructError = PyErr_NewException("struct.error", NULL, NULL);\r | |
2083 | if (StructError == NULL)\r | |
2084 | return;\r | |
2085 | }\r | |
2086 | \r | |
2087 | Py_INCREF(StructError);\r | |
2088 | PyModule_AddObject(m, "error", StructError);\r | |
2089 | \r | |
2090 | Py_INCREF((PyObject*)&PyStructType);\r | |
2091 | PyModule_AddObject(m, "Struct", (PyObject*)&PyStructType);\r | |
2092 | \r | |
2093 | PyModule_AddObject(m, "__version__", ver);\r | |
2094 | \r | |
2095 | PyModule_AddIntConstant(m, "_PY_STRUCT_RANGE_CHECKING", 1);\r | |
2096 | PyModule_AddIntConstant(m, "_PY_STRUCT_FLOAT_COERCE", 1);\r | |
2097 | }\r |