Bob Ippolito | 232f3c9 | 2006-05-23 19:12:41 +0000 | [diff] [blame^] | 1 | /* struct module -- pack values into and (out of) strings */ |
| 2 | |
| 3 | /* New version supporting byte order, alignment and size options, |
| 4 | character strings, and unsigned numbers */ |
| 5 | |
| 6 | #include "Python.h" |
| 7 | #include "structseq.h" |
| 8 | #include "structmember.h" |
| 9 | #include <ctype.h> |
| 10 | |
| 11 | |
| 12 | /* compatibility macros */ |
| 13 | #if (PY_VERSION_HEX < 0x02050000) |
| 14 | typedef int Py_ssize_t; |
| 15 | #endif |
| 16 | |
| 17 | |
| 18 | |
| 19 | /* The translation function for each format character is table driven */ |
| 20 | |
| 21 | typedef struct _formatdef { |
| 22 | char format; |
| 23 | int size; |
| 24 | int alignment; |
| 25 | PyObject* (*unpack)(const char *, |
| 26 | const struct _formatdef *); |
| 27 | int (*pack)(char *, PyObject *, |
| 28 | const struct _formatdef *); |
| 29 | } formatdef; |
| 30 | |
| 31 | typedef struct _formatcode { |
| 32 | const struct _formatdef *fmtdef; |
| 33 | int offset; |
| 34 | int repeat; |
| 35 | } formatcode; |
| 36 | |
| 37 | /* Struct object interface */ |
| 38 | |
| 39 | typedef struct { |
| 40 | PyObject_HEAD |
| 41 | int s_size; |
| 42 | int s_len; |
| 43 | formatcode *s_codes; |
| 44 | PyObject *s_format; |
| 45 | PyObject *weakreflist; /* List of weak references */ |
| 46 | } PyStructObject; |
| 47 | |
| 48 | PyAPI_DATA(PyTypeObject) PyStruct_Type; |
| 49 | |
| 50 | #define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStruct_Type) |
| 51 | #define PyStruct_CheckExact(op) ((op)->ob_type == &PyStruct_Type) |
| 52 | |
| 53 | |
| 54 | /* Exception */ |
| 55 | |
| 56 | static PyObject *StructError; |
| 57 | |
| 58 | |
| 59 | /* Define various structs to figure out the alignments of types */ |
| 60 | |
| 61 | |
| 62 | typedef struct { char c; short x; } st_short; |
| 63 | typedef struct { char c; int x; } st_int; |
| 64 | typedef struct { char c; long x; } st_long; |
| 65 | typedef struct { char c; float x; } st_float; |
| 66 | typedef struct { char c; double x; } st_double; |
| 67 | typedef struct { char c; void *x; } st_void_p; |
| 68 | |
| 69 | #define SHORT_ALIGN (sizeof(st_short) - sizeof(short)) |
| 70 | #define INT_ALIGN (sizeof(st_int) - sizeof(int)) |
| 71 | #define LONG_ALIGN (sizeof(st_long) - sizeof(long)) |
| 72 | #define FLOAT_ALIGN (sizeof(st_float) - sizeof(float)) |
| 73 | #define DOUBLE_ALIGN (sizeof(st_double) - sizeof(double)) |
| 74 | #define VOID_P_ALIGN (sizeof(st_void_p) - sizeof(void *)) |
| 75 | |
| 76 | /* We can't support q and Q in native mode unless the compiler does; |
| 77 | in std mode, they're 8 bytes on all platforms. */ |
| 78 | #ifdef HAVE_LONG_LONG |
| 79 | typedef struct { char c; PY_LONG_LONG x; } s_long_long; |
| 80 | #define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(PY_LONG_LONG)) |
| 81 | #endif |
| 82 | |
| 83 | #define STRINGIFY(x) #x |
| 84 | |
| 85 | #ifdef __powerc |
| 86 | #pragma options align=reset |
| 87 | #endif |
| 88 | |
| 89 | /* Helper to get a PyLongObject by hook or by crook. Caller should decref. */ |
| 90 | |
| 91 | static PyObject * |
| 92 | get_pylong(PyObject *v) |
| 93 | { |
| 94 | PyNumberMethods *m; |
| 95 | |
| 96 | assert(v != NULL); |
| 97 | if (PyInt_Check(v)) |
| 98 | return PyLong_FromLong(PyInt_AS_LONG(v)); |
| 99 | if (PyLong_Check(v)) { |
| 100 | Py_INCREF(v); |
| 101 | return v; |
| 102 | } |
| 103 | m = v->ob_type->tp_as_number; |
| 104 | if (m != NULL && m->nb_long != NULL) { |
| 105 | v = m->nb_long(v); |
| 106 | if (v == NULL) |
| 107 | return NULL; |
| 108 | if (PyLong_Check(v)) |
| 109 | return v; |
| 110 | Py_DECREF(v); |
| 111 | } |
| 112 | PyErr_SetString(StructError, |
| 113 | "cannot convert argument to long"); |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | /* Helper routine to get a Python integer and raise the appropriate error |
| 118 | if it isn't one */ |
| 119 | |
| 120 | static int |
| 121 | get_long(PyObject *v, long *p) |
| 122 | { |
| 123 | long x = PyInt_AsLong(v); |
| 124 | if (x == -1 && PyErr_Occurred()) { |
| 125 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
| 126 | PyErr_SetString(StructError, |
| 127 | "required argument is not an integer"); |
| 128 | return -1; |
| 129 | } |
| 130 | *p = x; |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | |
| 135 | /* Same, but handling unsigned long */ |
| 136 | |
| 137 | static int |
| 138 | get_ulong(PyObject *v, unsigned long *p) |
| 139 | { |
| 140 | if (PyLong_Check(v)) { |
| 141 | unsigned long x = PyLong_AsUnsignedLong(v); |
| 142 | if (x == (unsigned long)(-1) && PyErr_Occurred()) |
| 143 | return -1; |
| 144 | *p = x; |
| 145 | return 0; |
| 146 | } |
| 147 | else { |
| 148 | return get_long(v, (long *)p); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | #ifdef HAVE_LONG_LONG |
| 153 | |
| 154 | /* Same, but handling native long long. */ |
| 155 | |
| 156 | static int |
| 157 | get_longlong(PyObject *v, PY_LONG_LONG *p) |
| 158 | { |
| 159 | PY_LONG_LONG x; |
| 160 | |
| 161 | v = get_pylong(v); |
| 162 | if (v == NULL) |
| 163 | return -1; |
| 164 | assert(PyLong_Check(v)); |
| 165 | x = PyLong_AsLongLong(v); |
| 166 | Py_DECREF(v); |
| 167 | if (x == (PY_LONG_LONG)-1 && PyErr_Occurred()) |
| 168 | return -1; |
| 169 | *p = x; |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | /* Same, but handling native unsigned long long. */ |
| 174 | |
| 175 | static int |
| 176 | get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p) |
| 177 | { |
| 178 | unsigned PY_LONG_LONG x; |
| 179 | |
| 180 | v = get_pylong(v); |
| 181 | if (v == NULL) |
| 182 | return -1; |
| 183 | assert(PyLong_Check(v)); |
| 184 | x = PyLong_AsUnsignedLongLong(v); |
| 185 | Py_DECREF(v); |
| 186 | if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred()) |
| 187 | return -1; |
| 188 | *p = x; |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | #endif |
| 193 | |
| 194 | /* Floating point helpers */ |
| 195 | |
| 196 | static PyObject * |
| 197 | unpack_float(const char *p, /* start of 4-byte string */ |
| 198 | int le) /* true for little-endian, false for big-endian */ |
| 199 | { |
| 200 | double x; |
| 201 | |
| 202 | x = _PyFloat_Unpack4((unsigned char *)p, le); |
| 203 | if (x == -1.0 && PyErr_Occurred()) |
| 204 | return NULL; |
| 205 | return PyFloat_FromDouble(x); |
| 206 | } |
| 207 | |
| 208 | static PyObject * |
| 209 | unpack_double(const char *p, /* start of 8-byte string */ |
| 210 | int le) /* true for little-endian, false for big-endian */ |
| 211 | { |
| 212 | double x; |
| 213 | |
| 214 | x = _PyFloat_Unpack8((unsigned char *)p, le); |
| 215 | if (x == -1.0 && PyErr_Occurred()) |
| 216 | return NULL; |
| 217 | return PyFloat_FromDouble(x); |
| 218 | } |
| 219 | |
| 220 | |
| 221 | /* A large number of small routines follow, with names of the form |
| 222 | |
| 223 | [bln][up]_TYPE |
| 224 | |
| 225 | [bln] distiguishes among big-endian, little-endian and native. |
| 226 | [pu] distiguishes between pack (to struct) and unpack (from struct). |
| 227 | TYPE is one of char, byte, ubyte, etc. |
| 228 | */ |
| 229 | |
| 230 | /* Native mode routines. ****************************************************/ |
| 231 | /* NOTE: |
| 232 | In all n[up]_<type> routines handling types larger than 1 byte, there is |
| 233 | *no* guarantee that the p pointer is properly aligned for each type, |
| 234 | therefore memcpy is called. An intermediate variable is used to |
| 235 | compensate for big-endian architectures. |
| 236 | Normally both the intermediate variable and the memcpy call will be |
| 237 | skipped by C optimisation in little-endian architectures (gcc >= 2.91 |
| 238 | does this). */ |
| 239 | |
| 240 | static PyObject * |
| 241 | nu_char(const char *p, const formatdef *f) |
| 242 | { |
| 243 | return PyString_FromStringAndSize(p, 1); |
| 244 | } |
| 245 | |
| 246 | static PyObject * |
| 247 | nu_byte(const char *p, const formatdef *f) |
| 248 | { |
| 249 | return PyInt_FromLong((long) *(signed char *)p); |
| 250 | } |
| 251 | |
| 252 | static PyObject * |
| 253 | nu_ubyte(const char *p, const formatdef *f) |
| 254 | { |
| 255 | return PyInt_FromLong((long) *(unsigned char *)p); |
| 256 | } |
| 257 | |
| 258 | static PyObject * |
| 259 | nu_short(const char *p, const formatdef *f) |
| 260 | { |
| 261 | short x; |
| 262 | memcpy((char *)&x, p, sizeof x); |
| 263 | return PyInt_FromLong((long)x); |
| 264 | } |
| 265 | |
| 266 | static PyObject * |
| 267 | nu_ushort(const char *p, const formatdef *f) |
| 268 | { |
| 269 | unsigned short x; |
| 270 | memcpy((char *)&x, p, sizeof x); |
| 271 | return PyInt_FromLong((long)x); |
| 272 | } |
| 273 | |
| 274 | static PyObject * |
| 275 | nu_int(const char *p, const formatdef *f) |
| 276 | { |
| 277 | int x; |
| 278 | memcpy((char *)&x, p, sizeof x); |
| 279 | return PyInt_FromLong((long)x); |
| 280 | } |
| 281 | |
| 282 | static PyObject * |
| 283 | nu_uint(const char *p, const formatdef *f) |
| 284 | { |
| 285 | unsigned int x; |
| 286 | memcpy((char *)&x, p, sizeof x); |
| 287 | return PyLong_FromUnsignedLong((unsigned long)x); |
| 288 | } |
| 289 | |
| 290 | static PyObject * |
| 291 | nu_long(const char *p, const formatdef *f) |
| 292 | { |
| 293 | long x; |
| 294 | memcpy((char *)&x, p, sizeof x); |
| 295 | return PyInt_FromLong(x); |
| 296 | } |
| 297 | |
| 298 | static PyObject * |
| 299 | nu_ulong(const char *p, const formatdef *f) |
| 300 | { |
| 301 | unsigned long x; |
| 302 | memcpy((char *)&x, p, sizeof x); |
| 303 | return PyLong_FromUnsignedLong(x); |
| 304 | } |
| 305 | |
| 306 | /* Native mode doesn't support q or Q unless the platform C supports |
| 307 | long long (or, on Windows, __int64). */ |
| 308 | |
| 309 | #ifdef HAVE_LONG_LONG |
| 310 | |
| 311 | static PyObject * |
| 312 | nu_longlong(const char *p, const formatdef *f) |
| 313 | { |
| 314 | PY_LONG_LONG x; |
| 315 | memcpy((char *)&x, p, sizeof x); |
| 316 | return PyLong_FromLongLong(x); |
| 317 | } |
| 318 | |
| 319 | static PyObject * |
| 320 | nu_ulonglong(const char *p, const formatdef *f) |
| 321 | { |
| 322 | unsigned PY_LONG_LONG x; |
| 323 | memcpy((char *)&x, p, sizeof x); |
| 324 | return PyLong_FromUnsignedLongLong(x); |
| 325 | } |
| 326 | |
| 327 | #endif |
| 328 | |
| 329 | static PyObject * |
| 330 | nu_float(const char *p, const formatdef *f) |
| 331 | { |
| 332 | float x; |
| 333 | memcpy((char *)&x, p, sizeof x); |
| 334 | return PyFloat_FromDouble((double)x); |
| 335 | } |
| 336 | |
| 337 | static PyObject * |
| 338 | nu_double(const char *p, const formatdef *f) |
| 339 | { |
| 340 | double x; |
| 341 | memcpy((char *)&x, p, sizeof x); |
| 342 | return PyFloat_FromDouble(x); |
| 343 | } |
| 344 | |
| 345 | static PyObject * |
| 346 | nu_void_p(const char *p, const formatdef *f) |
| 347 | { |
| 348 | void *x; |
| 349 | memcpy((char *)&x, p, sizeof x); |
| 350 | return PyLong_FromVoidPtr(x); |
| 351 | } |
| 352 | |
| 353 | static int |
| 354 | np_byte(char *p, PyObject *v, const formatdef *f) |
| 355 | { |
| 356 | long x; |
| 357 | if (get_long(v, &x) < 0) |
| 358 | return -1; |
| 359 | if (x < -128 || x > 127){ |
| 360 | PyErr_SetString(StructError, |
| 361 | "byte format requires -128<=number<=127"); |
| 362 | return -1; |
| 363 | } |
| 364 | *p = (char)x; |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static int |
| 369 | np_ubyte(char *p, PyObject *v, const formatdef *f) |
| 370 | { |
| 371 | long x; |
| 372 | if (get_long(v, &x) < 0) |
| 373 | return -1; |
| 374 | if (x < 0 || x > 255){ |
| 375 | PyErr_SetString(StructError, |
| 376 | "ubyte format requires 0<=number<=255"); |
| 377 | return -1; |
| 378 | } |
| 379 | *p = (char)x; |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static int |
| 384 | np_char(char *p, PyObject *v, const formatdef *f) |
| 385 | { |
| 386 | if (!PyString_Check(v) || PyString_Size(v) != 1) { |
| 387 | PyErr_SetString(StructError, |
| 388 | "char format require string of length 1"); |
| 389 | return -1; |
| 390 | } |
| 391 | *p = *PyString_AsString(v); |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | static int |
| 396 | np_short(char *p, PyObject *v, const formatdef *f) |
| 397 | { |
| 398 | long x; |
| 399 | short y; |
| 400 | if (get_long(v, &x) < 0) |
| 401 | return -1; |
| 402 | if (x < SHRT_MIN || x > SHRT_MAX){ |
| 403 | PyErr_SetString(StructError, |
| 404 | "short format requires " STRINGIFY(SHRT_MIN) |
| 405 | "<=number<=" STRINGIFY(SHRT_MAX)); |
| 406 | return -1; |
| 407 | } |
| 408 | y = (short)x; |
| 409 | memcpy(p, (char *)&y, sizeof y); |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | static int |
| 414 | np_ushort(char *p, PyObject *v, const formatdef *f) |
| 415 | { |
| 416 | long x; |
| 417 | unsigned short y; |
| 418 | if (get_long(v, &x) < 0) |
| 419 | return -1; |
| 420 | if (x < 0 || x > USHRT_MAX){ |
| 421 | PyErr_SetString(StructError, |
| 422 | "short format requires 0<=number<=" STRINGIFY(USHRT_MAX)); |
| 423 | return -1; |
| 424 | } |
| 425 | y = (unsigned short)x; |
| 426 | memcpy(p, (char *)&y, sizeof y); |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static int |
| 431 | np_int(char *p, PyObject *v, const formatdef *f) |
| 432 | { |
| 433 | long x; |
| 434 | int y; |
| 435 | if (get_long(v, &x) < 0) |
| 436 | return -1; |
| 437 | y = (int)x; |
| 438 | memcpy(p, (char *)&y, sizeof y); |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | static int |
| 443 | np_uint(char *p, PyObject *v, const formatdef *f) |
| 444 | { |
| 445 | unsigned long x; |
| 446 | unsigned int y; |
| 447 | if (get_ulong(v, &x) < 0) |
| 448 | return -1; |
| 449 | y = (unsigned int)x; |
| 450 | memcpy(p, (char *)&y, sizeof y); |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | static int |
| 455 | np_long(char *p, PyObject *v, const formatdef *f) |
| 456 | { |
| 457 | long x; |
| 458 | if (get_long(v, &x) < 0) |
| 459 | return -1; |
| 460 | memcpy(p, (char *)&x, sizeof x); |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | static int |
| 465 | np_ulong(char *p, PyObject *v, const formatdef *f) |
| 466 | { |
| 467 | unsigned long x; |
| 468 | if (get_ulong(v, &x) < 0) |
| 469 | return -1; |
| 470 | memcpy(p, (char *)&x, sizeof x); |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | #ifdef HAVE_LONG_LONG |
| 475 | |
| 476 | static int |
| 477 | np_longlong(char *p, PyObject *v, const formatdef *f) |
| 478 | { |
| 479 | PY_LONG_LONG x; |
| 480 | if (get_longlong(v, &x) < 0) |
| 481 | return -1; |
| 482 | memcpy(p, (char *)&x, sizeof x); |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | static int |
| 487 | np_ulonglong(char *p, PyObject *v, const formatdef *f) |
| 488 | { |
| 489 | unsigned PY_LONG_LONG x; |
| 490 | if (get_ulonglong(v, &x) < 0) |
| 491 | return -1; |
| 492 | memcpy(p, (char *)&x, sizeof x); |
| 493 | return 0; |
| 494 | } |
| 495 | #endif |
| 496 | |
| 497 | static int |
| 498 | np_float(char *p, PyObject *v, const formatdef *f) |
| 499 | { |
| 500 | float x = (float)PyFloat_AsDouble(v); |
| 501 | if (x == -1 && PyErr_Occurred()) { |
| 502 | PyErr_SetString(StructError, |
| 503 | "required argument is not a float"); |
| 504 | return -1; |
| 505 | } |
| 506 | memcpy(p, (char *)&x, sizeof x); |
| 507 | return 0; |
| 508 | } |
| 509 | |
| 510 | static int |
| 511 | np_double(char *p, PyObject *v, const formatdef *f) |
| 512 | { |
| 513 | double x = PyFloat_AsDouble(v); |
| 514 | if (x == -1 && PyErr_Occurred()) { |
| 515 | PyErr_SetString(StructError, |
| 516 | "required argument is not a float"); |
| 517 | return -1; |
| 518 | } |
| 519 | memcpy(p, (char *)&x, sizeof(double)); |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | static int |
| 524 | np_void_p(char *p, PyObject *v, const formatdef *f) |
| 525 | { |
| 526 | void *x; |
| 527 | |
| 528 | v = get_pylong(v); |
| 529 | if (v == NULL) |
| 530 | return -1; |
| 531 | assert(PyLong_Check(v)); |
| 532 | x = PyLong_AsVoidPtr(v); |
| 533 | Py_DECREF(v); |
| 534 | if (x == NULL && PyErr_Occurred()) |
| 535 | return -1; |
| 536 | memcpy(p, (char *)&x, sizeof x); |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | static formatdef native_table[] = { |
| 541 | {'x', sizeof(char), 0, NULL}, |
| 542 | {'b', sizeof(char), 0, nu_byte, np_byte}, |
| 543 | {'B', sizeof(char), 0, nu_ubyte, np_ubyte}, |
| 544 | {'c', sizeof(char), 0, nu_char, np_char}, |
| 545 | {'s', sizeof(char), 0, NULL}, |
| 546 | {'p', sizeof(char), 0, NULL}, |
| 547 | {'h', sizeof(short), SHORT_ALIGN, nu_short, np_short}, |
| 548 | {'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_ushort}, |
| 549 | {'i', sizeof(int), INT_ALIGN, nu_int, np_int}, |
| 550 | {'I', sizeof(int), INT_ALIGN, nu_uint, np_uint}, |
| 551 | {'l', sizeof(long), LONG_ALIGN, nu_long, np_long}, |
| 552 | {'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong}, |
| 553 | {'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float}, |
| 554 | {'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double}, |
| 555 | {'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p}, |
| 556 | #ifdef HAVE_LONG_LONG |
| 557 | {'q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_longlong, np_longlong}, |
| 558 | {'Q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_ulonglong,np_ulonglong}, |
| 559 | #endif |
| 560 | {0} |
| 561 | }; |
| 562 | |
| 563 | /* Big-endian routines. *****************************************************/ |
| 564 | |
| 565 | static PyObject * |
| 566 | bu_int(const char *p, const formatdef *f) |
| 567 | { |
| 568 | long x = 0; |
| 569 | int i = f->size; |
| 570 | do { |
| 571 | x = (x<<8) | (*p++ & 0xFF); |
| 572 | } while (--i > 0); |
| 573 | /* Extend the sign bit. */ |
| 574 | if (SIZEOF_LONG > f->size) |
| 575 | x |= -(x & (1L << (8*f->size - 1))); |
| 576 | return PyInt_FromLong(x); |
| 577 | } |
| 578 | |
| 579 | static PyObject * |
| 580 | bu_uint(const char *p, const formatdef *f) |
| 581 | { |
| 582 | unsigned long x = 0; |
| 583 | int i = f->size; |
| 584 | do { |
| 585 | x = (x<<8) | (*p++ & 0xFF); |
| 586 | } while (--i > 0); |
| 587 | if (f->size >= 4) |
| 588 | return PyLong_FromUnsignedLong(x); |
| 589 | else |
| 590 | return PyInt_FromLong((long)x); |
| 591 | } |
| 592 | |
| 593 | static PyObject * |
| 594 | bu_longlong(const char *p, const formatdef *f) |
| 595 | { |
| 596 | return _PyLong_FromByteArray((const unsigned char *)p, |
| 597 | 8, |
| 598 | 0, /* little-endian */ |
| 599 | 1 /* signed */); |
| 600 | } |
| 601 | |
| 602 | static PyObject * |
| 603 | bu_ulonglong(const char *p, const formatdef *f) |
| 604 | { |
| 605 | return _PyLong_FromByteArray((const unsigned char *)p, |
| 606 | 8, |
| 607 | 0, /* little-endian */ |
| 608 | 0 /* signed */); |
| 609 | } |
| 610 | |
| 611 | static PyObject * |
| 612 | bu_float(const char *p, const formatdef *f) |
| 613 | { |
| 614 | return unpack_float(p, 0); |
| 615 | } |
| 616 | |
| 617 | static PyObject * |
| 618 | bu_double(const char *p, const formatdef *f) |
| 619 | { |
| 620 | return unpack_double(p, 0); |
| 621 | } |
| 622 | |
| 623 | static int |
| 624 | bp_int(char *p, PyObject *v, const formatdef *f) |
| 625 | { |
| 626 | long x; |
| 627 | int i; |
| 628 | if (get_long(v, &x) < 0) |
| 629 | return -1; |
| 630 | i = f->size; |
| 631 | do { |
| 632 | p[--i] = (char)x; |
| 633 | x >>= 8; |
| 634 | } while (i > 0); |
| 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | static int |
| 639 | bp_uint(char *p, PyObject *v, const formatdef *f) |
| 640 | { |
| 641 | unsigned long x; |
| 642 | int i; |
| 643 | if (get_ulong(v, &x) < 0) |
| 644 | return -1; |
| 645 | i = f->size; |
| 646 | do { |
| 647 | p[--i] = (char)x; |
| 648 | x >>= 8; |
| 649 | } while (i > 0); |
| 650 | return 0; |
| 651 | } |
| 652 | |
| 653 | static int |
| 654 | bp_longlong(char *p, PyObject *v, const formatdef *f) |
| 655 | { |
| 656 | int res; |
| 657 | v = get_pylong(v); |
| 658 | if (v == NULL) |
| 659 | return -1; |
| 660 | res = _PyLong_AsByteArray((PyLongObject *)v, |
| 661 | (unsigned char *)p, |
| 662 | 8, |
| 663 | 0, /* little_endian */ |
| 664 | 1 /* signed */); |
| 665 | Py_DECREF(v); |
| 666 | return res; |
| 667 | } |
| 668 | |
| 669 | static int |
| 670 | bp_ulonglong(char *p, PyObject *v, const formatdef *f) |
| 671 | { |
| 672 | int res; |
| 673 | v = get_pylong(v); |
| 674 | if (v == NULL) |
| 675 | return -1; |
| 676 | res = _PyLong_AsByteArray((PyLongObject *)v, |
| 677 | (unsigned char *)p, |
| 678 | 8, |
| 679 | 0, /* little_endian */ |
| 680 | 0 /* signed */); |
| 681 | Py_DECREF(v); |
| 682 | return res; |
| 683 | } |
| 684 | |
| 685 | static int |
| 686 | bp_float(char *p, PyObject *v, const formatdef *f) |
| 687 | { |
| 688 | double x = PyFloat_AsDouble(v); |
| 689 | if (x == -1 && PyErr_Occurred()) { |
| 690 | PyErr_SetString(StructError, |
| 691 | "required argument is not a float"); |
| 692 | return -1; |
| 693 | } |
| 694 | return _PyFloat_Pack4(x, (unsigned char *)p, 0); |
| 695 | } |
| 696 | |
| 697 | static int |
| 698 | bp_double(char *p, PyObject *v, const formatdef *f) |
| 699 | { |
| 700 | double x = PyFloat_AsDouble(v); |
| 701 | if (x == -1 && PyErr_Occurred()) { |
| 702 | PyErr_SetString(StructError, |
| 703 | "required argument is not a float"); |
| 704 | return -1; |
| 705 | } |
| 706 | return _PyFloat_Pack8(x, (unsigned char *)p, 0); |
| 707 | } |
| 708 | |
| 709 | static formatdef bigendian_table[] = { |
| 710 | {'x', 1, 0, NULL}, |
| 711 | {'b', 1, 0, bu_int, bp_int}, |
| 712 | {'B', 1, 0, bu_uint, bp_int}, |
| 713 | {'c', 1, 0, nu_char, np_char}, |
| 714 | {'s', 1, 0, NULL}, |
| 715 | {'p', 1, 0, NULL}, |
| 716 | {'h', 2, 0, bu_int, bp_int}, |
| 717 | {'H', 2, 0, bu_uint, bp_uint}, |
| 718 | {'i', 4, 0, bu_int, bp_int}, |
| 719 | {'I', 4, 0, bu_uint, bp_uint}, |
| 720 | {'l', 4, 0, bu_int, bp_int}, |
| 721 | {'L', 4, 0, bu_uint, bp_uint}, |
| 722 | {'q', 8, 0, bu_longlong, bp_longlong}, |
| 723 | {'Q', 8, 0, bu_ulonglong, bp_ulonglong}, |
| 724 | {'f', 4, 0, bu_float, bp_float}, |
| 725 | {'d', 8, 0, bu_double, bp_double}, |
| 726 | {0} |
| 727 | }; |
| 728 | |
| 729 | /* Little-endian routines. *****************************************************/ |
| 730 | |
| 731 | static PyObject * |
| 732 | lu_int(const char *p, const formatdef *f) |
| 733 | { |
| 734 | long x = 0; |
| 735 | int i = f->size; |
| 736 | do { |
| 737 | x = (x<<8) | (p[--i] & 0xFF); |
| 738 | } while (i > 0); |
| 739 | /* Extend the sign bit. */ |
| 740 | if (SIZEOF_LONG > f->size) |
| 741 | x |= -(x & (1L << (8*f->size - 1))); |
| 742 | return PyInt_FromLong(x); |
| 743 | } |
| 744 | |
| 745 | static PyObject * |
| 746 | lu_uint(const char *p, const formatdef *f) |
| 747 | { |
| 748 | unsigned long x = 0; |
| 749 | int i = f->size; |
| 750 | do { |
| 751 | x = (x<<8) | (p[--i] & 0xFF); |
| 752 | } while (i > 0); |
| 753 | if (f->size >= 4) |
| 754 | return PyLong_FromUnsignedLong(x); |
| 755 | else |
| 756 | return PyInt_FromLong((long)x); |
| 757 | } |
| 758 | |
| 759 | static PyObject * |
| 760 | lu_longlong(const char *p, const formatdef *f) |
| 761 | { |
| 762 | return _PyLong_FromByteArray((const unsigned char *)p, |
| 763 | 8, |
| 764 | 1, /* little-endian */ |
| 765 | 1 /* signed */); |
| 766 | } |
| 767 | |
| 768 | static PyObject * |
| 769 | lu_ulonglong(const char *p, const formatdef *f) |
| 770 | { |
| 771 | return _PyLong_FromByteArray((const unsigned char *)p, |
| 772 | 8, |
| 773 | 1, /* little-endian */ |
| 774 | 0 /* signed */); |
| 775 | } |
| 776 | |
| 777 | static PyObject * |
| 778 | lu_float(const char *p, const formatdef *f) |
| 779 | { |
| 780 | return unpack_float(p, 1); |
| 781 | } |
| 782 | |
| 783 | static PyObject * |
| 784 | lu_double(const char *p, const formatdef *f) |
| 785 | { |
| 786 | return unpack_double(p, 1); |
| 787 | } |
| 788 | |
| 789 | static int |
| 790 | lp_int(char *p, PyObject *v, const formatdef *f) |
| 791 | { |
| 792 | long x; |
| 793 | int i; |
| 794 | if (get_long(v, &x) < 0) |
| 795 | return -1; |
| 796 | i = f->size; |
| 797 | do { |
| 798 | *p++ = (char)x; |
| 799 | x >>= 8; |
| 800 | } while (--i > 0); |
| 801 | return 0; |
| 802 | } |
| 803 | |
| 804 | static int |
| 805 | lp_uint(char *p, PyObject *v, const formatdef *f) |
| 806 | { |
| 807 | unsigned long x; |
| 808 | int i; |
| 809 | if (get_ulong(v, &x) < 0) |
| 810 | return -1; |
| 811 | i = f->size; |
| 812 | do { |
| 813 | *p++ = (char)x; |
| 814 | x >>= 8; |
| 815 | } while (--i > 0); |
| 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | static int |
| 820 | lp_longlong(char *p, PyObject *v, const formatdef *f) |
| 821 | { |
| 822 | int res; |
| 823 | v = get_pylong(v); |
| 824 | if (v == NULL) |
| 825 | return -1; |
| 826 | res = _PyLong_AsByteArray((PyLongObject*)v, |
| 827 | (unsigned char *)p, |
| 828 | 8, |
| 829 | 1, /* little_endian */ |
| 830 | 1 /* signed */); |
| 831 | Py_DECREF(v); |
| 832 | return res; |
| 833 | } |
| 834 | |
| 835 | static int |
| 836 | lp_ulonglong(char *p, PyObject *v, const formatdef *f) |
| 837 | { |
| 838 | int res; |
| 839 | v = get_pylong(v); |
| 840 | if (v == NULL) |
| 841 | return -1; |
| 842 | res = _PyLong_AsByteArray((PyLongObject*)v, |
| 843 | (unsigned char *)p, |
| 844 | 8, |
| 845 | 1, /* little_endian */ |
| 846 | 0 /* signed */); |
| 847 | Py_DECREF(v); |
| 848 | return res; |
| 849 | } |
| 850 | |
| 851 | static int |
| 852 | lp_float(char *p, PyObject *v, const formatdef *f) |
| 853 | { |
| 854 | double x = PyFloat_AsDouble(v); |
| 855 | if (x == -1 && PyErr_Occurred()) { |
| 856 | PyErr_SetString(StructError, |
| 857 | "required argument is not a float"); |
| 858 | return -1; |
| 859 | } |
| 860 | return _PyFloat_Pack4(x, (unsigned char *)p, 1); |
| 861 | } |
| 862 | |
| 863 | static int |
| 864 | lp_double(char *p, PyObject *v, const formatdef *f) |
| 865 | { |
| 866 | double x = PyFloat_AsDouble(v); |
| 867 | if (x == -1 && PyErr_Occurred()) { |
| 868 | PyErr_SetString(StructError, |
| 869 | "required argument is not a float"); |
| 870 | return -1; |
| 871 | } |
| 872 | return _PyFloat_Pack8(x, (unsigned char *)p, 1); |
| 873 | } |
| 874 | |
| 875 | static formatdef lilendian_table[] = { |
| 876 | {'x', 1, 0, NULL}, |
| 877 | {'b', 1, 0, lu_int, lp_int}, |
| 878 | {'B', 1, 0, lu_uint, lp_int}, |
| 879 | {'c', 1, 0, nu_char, np_char}, |
| 880 | {'s', 1, 0, NULL}, |
| 881 | {'p', 1, 0, NULL}, |
| 882 | {'h', 2, 0, lu_int, lp_int}, |
| 883 | {'H', 2, 0, lu_uint, lp_uint}, |
| 884 | {'i', 4, 0, lu_int, lp_int}, |
| 885 | {'I', 4, 0, lu_uint, lp_uint}, |
| 886 | {'l', 4, 0, lu_int, lp_int}, |
| 887 | {'L', 4, 0, lu_uint, lp_uint}, |
| 888 | {'q', 8, 0, lu_longlong, lp_longlong}, |
| 889 | {'Q', 8, 0, lu_ulonglong, lp_ulonglong}, |
| 890 | {'f', 4, 0, lu_float, lp_float}, |
| 891 | {'d', 8, 0, lu_double, lp_double}, |
| 892 | {0} |
| 893 | }; |
| 894 | |
| 895 | |
| 896 | static const formatdef * |
| 897 | whichtable(char **pfmt) |
| 898 | { |
| 899 | const char *fmt = (*pfmt)++; /* May be backed out of later */ |
| 900 | switch (*fmt) { |
| 901 | case '<': |
| 902 | return lilendian_table; |
| 903 | case '>': |
| 904 | case '!': /* Network byte order is big-endian */ |
| 905 | return bigendian_table; |
| 906 | case '=': { /* Host byte order -- different from native in aligment! */ |
| 907 | int n = 1; |
| 908 | char *p = (char *) &n; |
| 909 | if (*p == 1) |
| 910 | return lilendian_table; |
| 911 | else |
| 912 | return bigendian_table; |
| 913 | } |
| 914 | default: |
| 915 | --*pfmt; /* Back out of pointer increment */ |
| 916 | /* Fall through */ |
| 917 | case '@': |
| 918 | return native_table; |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | |
| 923 | /* Get the table entry for a format code */ |
| 924 | |
| 925 | static const formatdef * |
| 926 | getentry(int c, const formatdef *f) |
| 927 | { |
| 928 | for (; f->format != '\0'; f++) { |
| 929 | if (f->format == c) { |
| 930 | return f; |
| 931 | } |
| 932 | } |
| 933 | PyErr_SetString(StructError, "bad char in struct format"); |
| 934 | return NULL; |
| 935 | } |
| 936 | |
| 937 | |
| 938 | /* Align a size according to a format code */ |
| 939 | |
| 940 | static int |
| 941 | align(int size, int c, const formatdef *e) |
| 942 | { |
| 943 | if (e->format == c) { |
| 944 | if (e->alignment) { |
| 945 | size = ((size + e->alignment - 1) |
| 946 | / e->alignment) |
| 947 | * e->alignment; |
| 948 | } |
| 949 | } |
| 950 | return size; |
| 951 | } |
| 952 | |
| 953 | |
| 954 | /* calculate the size of a format string */ |
| 955 | |
| 956 | static int |
| 957 | prepare_s(PyStructObject *self) |
| 958 | { |
| 959 | const formatdef *f; |
| 960 | const formatdef *e; |
| 961 | formatcode *codes; |
| 962 | |
| 963 | const char *s; |
| 964 | const char *fmt; |
| 965 | char c; |
| 966 | int size, len, numcodes, num, itemsize, x; |
| 967 | |
| 968 | fmt = PyString_AS_STRING(self->s_format); |
| 969 | |
| 970 | f = whichtable((char **)&fmt); |
| 971 | |
| 972 | s = fmt; |
| 973 | size = 0; |
| 974 | len = 0; |
| 975 | numcodes = 0; |
| 976 | while ((c = *s++) != '\0') { |
| 977 | if (isspace(Py_CHARMASK(c))) |
| 978 | continue; |
| 979 | if ('0' <= c && c <= '9') { |
| 980 | num = c - '0'; |
| 981 | while ('0' <= (c = *s++) && c <= '9') { |
| 982 | x = num*10 + (c - '0'); |
| 983 | if (x/10 != num) { |
| 984 | PyErr_SetString( |
| 985 | StructError, |
| 986 | "overflow in item count"); |
| 987 | return -1; |
| 988 | } |
| 989 | num = x; |
| 990 | } |
| 991 | if (c == '\0') |
| 992 | break; |
| 993 | } |
| 994 | else |
| 995 | num = 1; |
| 996 | |
| 997 | e = getentry(c, f); |
| 998 | if (e == NULL) |
| 999 | return -1; |
| 1000 | |
| 1001 | switch (c) { |
| 1002 | case 's': /* fall through */ |
| 1003 | case 'p': len++; break; |
| 1004 | case 'x': break; |
| 1005 | default: len += num; break; |
| 1006 | } |
| 1007 | if (c != 'x') numcodes++; |
| 1008 | |
| 1009 | itemsize = e->size; |
| 1010 | size = align(size, c, e); |
| 1011 | x = num * itemsize; |
| 1012 | size += x; |
| 1013 | if (x/itemsize != num || size < 0) { |
| 1014 | PyErr_SetString(StructError, |
| 1015 | "total struct size too long"); |
| 1016 | return -1; |
| 1017 | } |
| 1018 | } |
| 1019 | |
| 1020 | self->s_size = size; |
| 1021 | self->s_len = len; |
| 1022 | codes = PyMem_MALLOC((numcodes + 1) * sizeof(formatcode)); |
| 1023 | if (codes == NULL) { |
| 1024 | PyErr_NoMemory(); |
| 1025 | return -1; |
| 1026 | } |
| 1027 | self->s_codes = codes; |
| 1028 | |
| 1029 | s = fmt; |
| 1030 | size = 0; |
| 1031 | while ((c = *s++) != '\0') { |
| 1032 | if (isspace(Py_CHARMASK(c))) |
| 1033 | continue; |
| 1034 | if ('0' <= c && c <= '9') { |
| 1035 | num = c - '0'; |
| 1036 | while ('0' <= (c = *s++) && c <= '9') |
| 1037 | num = num*10 + (c - '0'); |
| 1038 | if (c == '\0') |
| 1039 | break; |
| 1040 | } |
| 1041 | else |
| 1042 | num = 1; |
| 1043 | |
| 1044 | e = getentry(c, f); |
| 1045 | |
| 1046 | size = align(size, c, e); |
| 1047 | if (c != 'x') { |
| 1048 | codes->offset = size; |
| 1049 | codes->repeat = num; |
| 1050 | codes->fmtdef = e; |
| 1051 | codes++; |
| 1052 | } |
| 1053 | size += num * e->size; |
| 1054 | } |
| 1055 | codes->fmtdef = NULL; |
| 1056 | codes->offset = -1; |
| 1057 | codes->repeat = -1; |
| 1058 | |
| 1059 | return 0; |
| 1060 | } |
| 1061 | |
| 1062 | static PyObject * |
| 1063 | s_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1064 | { |
| 1065 | PyObject *self; |
| 1066 | static PyObject *not_yet_string; |
| 1067 | |
| 1068 | assert(type != NULL && type->tp_alloc != NULL); |
| 1069 | |
| 1070 | self = type->tp_alloc(type, 0); |
| 1071 | if (self != NULL) { |
| 1072 | PyStructObject *s = (PyStructObject*)self; |
| 1073 | Py_INCREF(Py_None); |
| 1074 | s->s_format = Py_None; |
| 1075 | s->s_codes = NULL; |
| 1076 | s->s_size = -1; |
| 1077 | s->s_len = -1; |
| 1078 | } |
| 1079 | return self; |
| 1080 | } |
| 1081 | |
| 1082 | static int |
| 1083 | s_init(PyObject *self, PyObject *args, PyObject *kwds) |
| 1084 | { |
| 1085 | PyStructObject *soself = (PyStructObject *)self; |
| 1086 | PyObject *o_format = NULL; |
| 1087 | int ret = 0; |
| 1088 | static char *kwlist[] = {"format", 0}; |
| 1089 | |
| 1090 | assert(PyStruct_Check(self)); |
| 1091 | |
| 1092 | if (!PyArg_ParseTupleAndKeywords(args, kwds, "S:Struct", kwlist, |
| 1093 | &o_format)) |
| 1094 | return -1; |
| 1095 | |
| 1096 | Py_INCREF(o_format); |
| 1097 | Py_XDECREF(soself->s_format); |
| 1098 | soself->s_format = o_format; |
| 1099 | |
| 1100 | ret = prepare_s(soself); |
| 1101 | return ret; |
| 1102 | } |
| 1103 | |
| 1104 | static void |
| 1105 | s_dealloc(PyStructObject *s) |
| 1106 | { |
| 1107 | int sts = 0; |
| 1108 | if (s->weakreflist != NULL) |
| 1109 | PyObject_ClearWeakRefs((PyObject *)s); |
| 1110 | if (s->s_codes != NULL) { |
| 1111 | PyMem_FREE(s->s_codes); |
| 1112 | } |
| 1113 | Py_XDECREF(s->s_format); |
| 1114 | s->ob_type->tp_free((PyObject *)s); |
| 1115 | } |
| 1116 | |
| 1117 | PyDoc_STRVAR(s_unpack__doc__, |
| 1118 | "unpack(str) -> (v1, v2, ...)\n\ |
| 1119 | \n\ |
| 1120 | Return tuple containing values unpacked according to this Struct's format.\n\ |
| 1121 | Requires len(str) == self.size. See struct.__doc__ for more on format\n\ |
| 1122 | strings."); |
| 1123 | |
| 1124 | static PyObject * |
| 1125 | s_unpack(PyObject *self, PyObject *inputstr) |
| 1126 | { |
| 1127 | PyStructObject *soself; |
| 1128 | PyObject *result; |
| 1129 | char *restart; |
| 1130 | formatcode *code; |
| 1131 | Py_ssize_t i; |
| 1132 | |
| 1133 | soself = (PyStructObject *)self; |
| 1134 | assert(PyStruct_Check(self)); |
| 1135 | assert(soself->s_codes != NULL); |
| 1136 | if (inputstr == NULL || !PyString_Check(inputstr) || |
| 1137 | PyString_GET_SIZE(inputstr) != soself->s_size) { |
| 1138 | PyErr_Format(StructError, |
| 1139 | "unpack requires a string argument of length %d", soself->s_size); |
| 1140 | return NULL; |
| 1141 | } |
| 1142 | result = PyTuple_New(soself->s_len); |
| 1143 | if (result == NULL) |
| 1144 | return NULL; |
| 1145 | |
| 1146 | |
| 1147 | restart = PyString_AS_STRING(inputstr); |
| 1148 | i = 0; |
| 1149 | for (code = soself->s_codes; code->fmtdef != NULL; code++) { |
| 1150 | Py_ssize_t n; |
| 1151 | PyObject *v; |
| 1152 | const formatdef *e = code->fmtdef; |
| 1153 | const char *res = restart + code->offset; |
| 1154 | if (e->format == 's') { |
| 1155 | v = PyString_FromStringAndSize(res, code->repeat); |
| 1156 | if (v == NULL) |
| 1157 | goto fail; |
| 1158 | PyTuple_SET_ITEM(result, i++, v); |
| 1159 | } else if (e->format == 'p') { |
| 1160 | n = *(unsigned char*)res; |
| 1161 | if (n >= code->repeat) |
| 1162 | n = code->repeat - 1; |
| 1163 | v = PyString_FromStringAndSize(res + 1, n); |
| 1164 | if (v == NULL) |
| 1165 | goto fail; |
| 1166 | PyTuple_SET_ITEM(result, i++, v); |
| 1167 | } else { |
| 1168 | for (n = 0; n < code->repeat; n++) { |
| 1169 | v = e->unpack(res, e); |
| 1170 | if (v == NULL) |
| 1171 | goto fail; |
| 1172 | PyTuple_SET_ITEM(result, i++, v); |
| 1173 | res += e->size; |
| 1174 | } |
| 1175 | } |
| 1176 | } |
| 1177 | |
| 1178 | return result; |
| 1179 | fail: |
| 1180 | Py_DECREF(result); |
| 1181 | return NULL; |
| 1182 | }; |
| 1183 | |
| 1184 | |
| 1185 | PyDoc_STRVAR(s_pack__doc__, |
| 1186 | "pack(v1, v2, ...) -> string\n\ |
| 1187 | \n\ |
| 1188 | Return a string containing values v1, v2, ... packed according to this\n\ |
| 1189 | Struct's format. See struct.__doc__ for more on format strings."); |
| 1190 | |
| 1191 | static PyObject * |
| 1192 | s_pack(PyObject *self, PyObject *args) |
| 1193 | { |
| 1194 | PyStructObject *soself; |
| 1195 | PyObject *result; |
| 1196 | char *restart; |
| 1197 | formatcode *code; |
| 1198 | Py_ssize_t i; |
| 1199 | |
| 1200 | soself = (PyStructObject *)self; |
| 1201 | assert(PyStruct_Check(self)); |
| 1202 | assert(soself->s_codes != NULL); |
| 1203 | if (args == NULL || !PyTuple_Check(args) || |
| 1204 | PyTuple_GET_SIZE(args) != soself->s_len) |
| 1205 | { |
| 1206 | PyErr_Format(StructError, |
| 1207 | "pack requires exactly %d arguments", soself->s_len); |
| 1208 | return NULL; |
| 1209 | } |
| 1210 | |
| 1211 | result = PyString_FromStringAndSize((char *)NULL, soself->s_size); |
| 1212 | if (result == NULL) |
| 1213 | return NULL; |
| 1214 | |
| 1215 | restart = PyString_AS_STRING(result); |
| 1216 | memset(restart, '\0', soself->s_size); |
| 1217 | i = 0; |
| 1218 | for (code = soself->s_codes; code->fmtdef != NULL; code++) { |
| 1219 | Py_ssize_t n; |
| 1220 | PyObject *v; |
| 1221 | const formatdef *e = code->fmtdef; |
| 1222 | char *res = restart + code->offset; |
| 1223 | if (e->format == 's') { |
| 1224 | v = PyTuple_GET_ITEM(args, i++); |
| 1225 | if (!PyString_Check(v)) { |
| 1226 | PyErr_SetString(StructError, |
| 1227 | "argument for 's' must be a string"); |
| 1228 | goto fail; |
| 1229 | } |
| 1230 | n = PyString_GET_SIZE(v); |
| 1231 | if (n > code->repeat) |
| 1232 | n = code->repeat; |
| 1233 | if (n > 0) |
| 1234 | memcpy(res, PyString_AS_STRING(v), n); |
| 1235 | } else if (e->format == 'p') { |
| 1236 | v = PyTuple_GET_ITEM(args, i++); |
| 1237 | if (!PyString_Check(v)) { |
| 1238 | PyErr_SetString(StructError, |
| 1239 | "argument for 'p' must be a string"); |
| 1240 | goto fail; |
| 1241 | } |
| 1242 | n = PyString_GET_SIZE(v); |
| 1243 | if (n > (code->repeat - 1)) |
| 1244 | n = code->repeat - 1; |
| 1245 | if (n > 0) |
| 1246 | memcpy(res + 1, PyString_AS_STRING(v), n); |
| 1247 | if (n > 255) |
| 1248 | n = 255; |
| 1249 | *res = Py_SAFE_DOWNCAST(n, Py_ssize_t, unsigned char); |
| 1250 | } else { |
| 1251 | for (n = 0; n < code->repeat; n++) { |
| 1252 | v = PyTuple_GET_ITEM(args, i++); |
| 1253 | if (e->pack(res, v, e) < 0) |
| 1254 | goto fail; |
| 1255 | res += e->size; |
| 1256 | } |
| 1257 | } |
| 1258 | } |
| 1259 | |
| 1260 | return result; |
| 1261 | |
| 1262 | fail: |
| 1263 | Py_DECREF(result); |
| 1264 | return NULL; |
| 1265 | |
| 1266 | } |
| 1267 | |
| 1268 | |
| 1269 | /* List of functions */ |
| 1270 | |
| 1271 | static struct PyMethodDef s_methods[] = { |
| 1272 | {"pack", s_pack, METH_VARARGS, s_pack__doc__}, |
| 1273 | {"unpack", s_unpack, METH_O, s_unpack__doc__}, |
| 1274 | {NULL, NULL} /* sentinel */ |
| 1275 | }; |
| 1276 | |
| 1277 | PyDoc_STRVAR(s__doc__, "Compiled struct object"); |
| 1278 | |
| 1279 | #define OFF(x) offsetof(PyStructObject, x) |
| 1280 | |
| 1281 | static PyMemberDef s_memberlist[] = { |
| 1282 | {"format", T_OBJECT, OFF(s_format), RO, |
| 1283 | "struct format string"}, |
| 1284 | {"size", T_INT, OFF(s_size), RO, |
| 1285 | "struct size in bytes"}, |
| 1286 | {"_len", T_INT, OFF(s_len), RO, |
| 1287 | "number of items expected in tuple"}, |
| 1288 | {NULL} /* Sentinel */ |
| 1289 | }; |
| 1290 | |
| 1291 | |
| 1292 | static |
| 1293 | PyTypeObject PyStructType = { |
| 1294 | PyObject_HEAD_INIT(&PyType_Type) |
| 1295 | 0, |
| 1296 | "Struct", |
| 1297 | sizeof(PyStructObject), |
| 1298 | 0, |
| 1299 | (destructor)s_dealloc, /* tp_dealloc */ |
| 1300 | 0, /* tp_print */ |
| 1301 | 0, /* tp_getattr */ |
| 1302 | 0, /* tp_setattr */ |
| 1303 | 0, /* tp_compare */ |
| 1304 | 0, /* tp_repr */ |
| 1305 | 0, /* tp_as_number */ |
| 1306 | 0, /* tp_as_sequence */ |
| 1307 | 0, /* tp_as_mapping */ |
| 1308 | 0, /* tp_hash */ |
| 1309 | 0, /* tp_call */ |
| 1310 | 0, /* tp_str */ |
| 1311 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1312 | PyObject_GenericSetAttr, /* tp_setattro */ |
| 1313 | 0, /* tp_as_buffer */ |
| 1314 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_WEAKREFS, /* tp_flags */ |
| 1315 | s__doc__, /* tp_doc */ |
| 1316 | 0, /* tp_traverse */ |
| 1317 | 0, /* tp_clear */ |
| 1318 | 0, /* tp_richcompare */ |
| 1319 | offsetof(PyStructObject, weakreflist), /* tp_weaklistoffset */ |
| 1320 | 0, /* tp_iter */ |
| 1321 | 0, /* tp_iternext */ |
| 1322 | s_methods, /* tp_methods */ |
| 1323 | s_memberlist, /* tp_members */ |
| 1324 | 0, /* tp_getset */ |
| 1325 | 0, /* tp_base */ |
| 1326 | 0, /* tp_dict */ |
| 1327 | 0, /* tp_descr_get */ |
| 1328 | 0, /* tp_descr_set */ |
| 1329 | 0, /* tp_dictoffset */ |
| 1330 | s_init, /* tp_init */ |
| 1331 | PyType_GenericAlloc, /* tp_alloc */ |
| 1332 | s_new, /* tp_new */ |
| 1333 | PyObject_Del, /* tp_free */ |
| 1334 | }; |
| 1335 | |
| 1336 | /* Module initialization */ |
| 1337 | |
| 1338 | PyMODINIT_FUNC |
| 1339 | init_struct(void) |
| 1340 | { |
| 1341 | PyObject *m = Py_InitModule("_struct", NULL); |
| 1342 | if (m == NULL) |
| 1343 | return; |
| 1344 | |
| 1345 | /* Add some symbolic constants to the module */ |
| 1346 | if (StructError == NULL) { |
| 1347 | StructError = PyErr_NewException("struct.error", NULL, NULL); |
| 1348 | if (StructError == NULL) |
| 1349 | return; |
| 1350 | } |
| 1351 | Py_INCREF(StructError); |
| 1352 | PyModule_AddObject(m, "error", StructError); |
| 1353 | Py_INCREF((PyObject*)&PyStructType); |
| 1354 | PyModule_AddObject(m, "Struct", (PyObject*)&PyStructType); |
| 1355 | } |