Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | 524b588 | 1995-01-04 19:10:35 +0000 | [diff] [blame] | 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | The Netherlands. |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 4 | |
| 5 | All Rights Reserved |
| 6 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 9 | provided that the above copyright notice appear in all copies and that |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 10 | both that copyright notice and this permission notice appear in |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 11 | supporting documentation, and that the names of Stichting Mathematisch |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 12 | Centrum or CWI or Corporation for National Research Initiatives or |
| 13 | CNRI not be used in advertising or publicity pertaining to |
| 14 | distribution of the software without specific, written prior |
| 15 | permission. |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 16 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 17 | While CWI is the initial source for this software, a modified version |
| 18 | is made available by the Corporation for National Research Initiatives |
| 19 | (CNRI) at the Internet address ftp://ftp.python.org. |
| 20 | |
| 21 | STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH |
| 22 | REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF |
| 23 | MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH |
| 24 | CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL |
| 25 | DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 26 | PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 27 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 28 | PERFORMANCE OF THIS SOFTWARE. |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 29 | |
| 30 | ******************************************************************/ |
| 31 | |
| 32 | /* struct module -- pack values into and (out of) strings */ |
| 33 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 34 | /* New version supporting byte order, alignment and size options, |
| 35 | character strings, and unsigned numbers */ |
| 36 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 37 | #include "Python.h" |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 38 | #include "mymath.h" |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 39 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 40 | #include <limits.h> |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame^] | 41 | #include <ctype.h> |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 42 | |
| 43 | |
| 44 | /* Exception */ |
| 45 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 46 | static PyObject *StructError; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 47 | |
| 48 | |
| 49 | /* Define various structs to figure out the alignments of types */ |
| 50 | |
Jack Jansen | 971e1df | 1995-02-02 14:29:10 +0000 | [diff] [blame] | 51 | #ifdef __MWERKS__ |
| 52 | /* |
| 53 | ** XXXX We have a problem here. There are no unique alignment rules |
| 54 | ** on the PowerPC mac. |
| 55 | */ |
| 56 | #ifdef __powerc |
| 57 | #pragma options align=mac68k |
| 58 | #endif |
| 59 | #endif /* __MWERKS__ */ |
| 60 | |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 61 | typedef struct { char c; short x; } s_short; |
| 62 | typedef struct { char c; int x; } s_int; |
| 63 | typedef struct { char c; long x; } s_long; |
| 64 | typedef struct { char c; float x; } s_float; |
| 65 | typedef struct { char c; double x; } s_double; |
| 66 | |
| 67 | #define SHORT_ALIGN (sizeof(s_short) - sizeof(short)) |
| 68 | #define INT_ALIGN (sizeof(s_int) - sizeof(int)) |
| 69 | #define LONG_ALIGN (sizeof(s_long) - sizeof(long)) |
| 70 | #define FLOAT_ALIGN (sizeof(s_float) - sizeof(float)) |
| 71 | #define DOUBLE_ALIGN (sizeof(s_double) - sizeof(double)) |
| 72 | |
Jack Jansen | 971e1df | 1995-02-02 14:29:10 +0000 | [diff] [blame] | 73 | #ifdef __powerc |
| 74 | #pragma options align=reset |
| 75 | #endif |
| 76 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 77 | /* Helper routine to get a Python integer and raise the appropriate error |
| 78 | if it isn't one */ |
| 79 | |
| 80 | static int |
| 81 | get_long(v, p) |
| 82 | PyObject *v; |
| 83 | long *p; |
| 84 | { |
| 85 | long x = PyInt_AsLong(v); |
| 86 | if (x == -1 && PyErr_Occurred()) { |
| 87 | if (PyErr_Occurred() == PyExc_TypeError) |
| 88 | PyErr_SetString(StructError, |
| 89 | "required argument is not an integer"); |
| 90 | return -1; |
| 91 | } |
| 92 | *p = x; |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 97 | /* Same, but handling unsigned long */ |
| 98 | |
| 99 | static int |
| 100 | get_ulong(v, p) |
| 101 | PyObject *v; |
| 102 | unsigned long *p; |
| 103 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 104 | if (PyLong_Check(v)) { |
| 105 | unsigned long x = PyLong_AsUnsignedLong(v); |
| 106 | if (x == (unsigned long)(-1) && PyErr_Occurred()) |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 107 | return -1; |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 108 | *p = x; |
| 109 | return 0; |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 110 | } |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 111 | else { |
| 112 | return get_long(v, (long *)p); |
| 113 | } |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 117 | /* Floating point helpers */ |
| 118 | |
| 119 | /* These use ANSI/IEEE Standard 754-1985 (Standard for Binary Floating |
| 120 | Point Arithmetic). See the following URL: |
| 121 | http://www.psc.edu/general/software/packages/ieee/ieee.html */ |
| 122 | |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 123 | /* XXX Inf/NaN are not handled quite right (but underflow is!) */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 124 | |
| 125 | static int |
| 126 | pack_float(x, p, incr) |
| 127 | double x; /* The number to pack */ |
| 128 | char *p; /* Where to pack the high order byte */ |
| 129 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 130 | { |
| 131 | int s; |
| 132 | int e; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 133 | double f; |
| 134 | long fbits; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 135 | |
| 136 | if (x < 0) { |
| 137 | s = 1; |
| 138 | x = -x; |
| 139 | } |
| 140 | else |
| 141 | s = 0; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 142 | |
| 143 | f = frexp(x, &e); |
| 144 | |
| 145 | /* Normalize f to be in the range [1.0, 2.0) */ |
| 146 | if (0.5 <= f && f < 1.0) { |
| 147 | f *= 2.0; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 148 | e--; |
| 149 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 150 | else if (f == 0.0) { |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 151 | e = 0; |
| 152 | } |
| 153 | else { |
| 154 | PyErr_SetString(PyExc_SystemError, |
| 155 | "frexp() result out of range"); |
| 156 | return -1; |
| 157 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 158 | |
| 159 | if (e >= 128) { |
| 160 | /* XXX 128 itself is reserved for Inf/NaN */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 161 | PyErr_SetString(PyExc_OverflowError, |
| 162 | "float too large to pack with f format"); |
| 163 | return -1; |
| 164 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 165 | else if (e < -126) { |
| 166 | /* Gradual underflow */ |
| 167 | f = ldexp(f, 126 + e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 168 | e = 0; |
| 169 | } |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 170 | else { |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 171 | e += 127; |
| 172 | f -= 1.0; /* Get rid of leading 1 */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 173 | } |
| 174 | |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 175 | f *= 8388608.0; /* 2**23 */ |
| 176 | fbits = (long) floor(f + 0.5); /* Round */ |
| 177 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 178 | /* First byte */ |
| 179 | *p = (s<<7) | (e>>1); |
| 180 | p += incr; |
| 181 | |
| 182 | /* Second byte */ |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 183 | *p = (char) (((e&1)<<7) | (fbits>>16)); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 184 | p += incr; |
| 185 | |
| 186 | /* Third byte */ |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 187 | *p = (fbits>>8) & 0xFF; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 188 | p += incr; |
| 189 | |
| 190 | /* Fourth byte */ |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 191 | *p = fbits&0xFF; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 192 | |
| 193 | /* Done */ |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static int |
| 198 | pack_double(x, p, incr) |
| 199 | double x; /* The number to pack */ |
| 200 | char *p; /* Where to pack the high order byte */ |
| 201 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 202 | { |
| 203 | int s; |
| 204 | int e; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 205 | double f; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 206 | long fhi, flo; |
| 207 | |
| 208 | if (x < 0) { |
| 209 | s = 1; |
| 210 | x = -x; |
| 211 | } |
| 212 | else |
| 213 | s = 0; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 214 | |
| 215 | f = frexp(x, &e); |
| 216 | |
| 217 | /* Normalize f to be in the range [1.0, 2.0) */ |
| 218 | if (0.5 <= f && f < 1.0) { |
| 219 | f *= 2.0; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 220 | e--; |
| 221 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 222 | else if (f == 0.0) { |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 223 | e = 0; |
| 224 | } |
| 225 | else { |
| 226 | PyErr_SetString(PyExc_SystemError, |
| 227 | "frexp() result out of range"); |
| 228 | return -1; |
| 229 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 230 | |
| 231 | if (e >= 1024) { |
| 232 | /* XXX 1024 itself is reserved for Inf/NaN */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 233 | PyErr_SetString(PyExc_OverflowError, |
| 234 | "float too large to pack with d format"); |
| 235 | return -1; |
| 236 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 237 | else if (e < -1022) { |
| 238 | /* Gradual underflow */ |
| 239 | f = ldexp(f, 1022 + e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 240 | e = 0; |
| 241 | } |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 242 | else { |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 243 | e += 1023; |
| 244 | f -= 1.0; /* Get rid of leading 1 */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 245 | } |
| 246 | |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 247 | /* fhi receives the high 28 bits; flo the low 24 bits (== 52 bits) */ |
| 248 | f *= 268435456.0; /* 2**28 */ |
| 249 | fhi = (long) floor(f); /* Truncate */ |
| 250 | f -= (double)fhi; |
| 251 | f *= 16777216.0; /* 2**24 */ |
| 252 | flo = (long) floor(f + 0.5); /* Round */ |
| 253 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 254 | /* First byte */ |
| 255 | *p = (s<<7) | (e>>4); |
| 256 | p += incr; |
| 257 | |
| 258 | /* Second byte */ |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 259 | *p = (char) (((e&0xF)<<4) | (fhi>>24)); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 260 | p += incr; |
| 261 | |
| 262 | /* Third byte */ |
| 263 | *p = (fhi>>16) & 0xFF; |
| 264 | p += incr; |
| 265 | |
| 266 | /* Fourth byte */ |
| 267 | *p = (fhi>>8) & 0xFF; |
| 268 | p += incr; |
| 269 | |
| 270 | /* Fifth byte */ |
| 271 | *p = fhi & 0xFF; |
| 272 | p += incr; |
| 273 | |
| 274 | /* Sixth byte */ |
| 275 | *p = (flo>>16) & 0xFF; |
| 276 | p += incr; |
| 277 | |
| 278 | /* Seventh byte */ |
| 279 | *p = (flo>>8) & 0xFF; |
| 280 | p += incr; |
| 281 | |
| 282 | /* Eighth byte */ |
| 283 | *p = flo & 0xFF; |
| 284 | p += incr; |
| 285 | |
| 286 | /* Done */ |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static PyObject * |
| 291 | unpack_float(p, incr) |
| 292 | char *p; /* Where the high order byte is */ |
| 293 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 294 | { |
| 295 | int s; |
| 296 | int e; |
| 297 | long f; |
| 298 | double x; |
| 299 | |
| 300 | /* First byte */ |
| 301 | s = (*p>>7) & 1; |
| 302 | e = (*p & 0x7F) << 1; |
| 303 | p += incr; |
| 304 | |
| 305 | /* Second byte */ |
| 306 | e |= (*p>>7) & 1; |
| 307 | f = (*p & 0x7F) << 16; |
| 308 | p += incr; |
| 309 | |
| 310 | /* Third byte */ |
| 311 | f |= (*p & 0xFF) << 8; |
| 312 | p += incr; |
| 313 | |
| 314 | /* Fourth byte */ |
| 315 | f |= *p & 0xFF; |
| 316 | |
| 317 | x = (double)f / 8388608.0; |
| 318 | |
| 319 | /* XXX This sadly ignores Inf/NaN issues */ |
Guido van Rossum | 07ef655 | 1997-01-02 22:31:07 +0000 | [diff] [blame] | 320 | if (e == 0) |
| 321 | e = -126; |
| 322 | else { |
| 323 | x += 1.0; |
| 324 | e -= 127; |
| 325 | } |
| 326 | x = ldexp(x, e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 327 | |
| 328 | if (s) |
| 329 | x = -x; |
| 330 | |
| 331 | return PyFloat_FromDouble(x); |
| 332 | } |
| 333 | |
| 334 | static PyObject * |
| 335 | unpack_double(p, incr) |
| 336 | char *p; /* Where the high order byte is */ |
| 337 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 338 | { |
| 339 | int s; |
| 340 | int e; |
| 341 | long fhi, flo; |
| 342 | double x; |
| 343 | |
| 344 | /* First byte */ |
| 345 | s = (*p>>7) & 1; |
| 346 | e = (*p & 0x7F) << 4; |
| 347 | p += incr; |
| 348 | |
| 349 | /* Second byte */ |
| 350 | e |= (*p>>4) & 0xF; |
| 351 | fhi = (*p & 0xF) << 24; |
| 352 | p += incr; |
| 353 | |
| 354 | /* Third byte */ |
| 355 | fhi |= (*p & 0xFF) << 16; |
| 356 | p += incr; |
| 357 | |
| 358 | /* Fourth byte */ |
| 359 | fhi |= (*p & 0xFF) << 8; |
| 360 | p += incr; |
| 361 | |
| 362 | /* Fifth byte */ |
| 363 | fhi |= *p & 0xFF; |
| 364 | p += incr; |
| 365 | |
| 366 | /* Sixth byte */ |
| 367 | flo = (*p & 0xFF) << 16; |
| 368 | p += incr; |
| 369 | |
| 370 | /* Seventh byte */ |
| 371 | flo |= (*p & 0xFF) << 8; |
| 372 | p += incr; |
| 373 | |
| 374 | /* Eighth byte */ |
| 375 | flo |= *p & 0xFF; |
| 376 | p += incr; |
| 377 | |
| 378 | x = (double)fhi + (double)flo / 16777216.0; /* 2**24 */ |
| 379 | x /= 268435456.0; /* 2**28 */ |
| 380 | |
| 381 | /* XXX This sadly ignores Inf/NaN */ |
Guido van Rossum | 07ef655 | 1997-01-02 22:31:07 +0000 | [diff] [blame] | 382 | if (e == 0) |
| 383 | e = -1022; |
| 384 | else { |
| 385 | x += 1.0; |
| 386 | e -= 1023; |
| 387 | } |
| 388 | x = ldexp(x, e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 389 | |
| 390 | if (s) |
| 391 | x = -x; |
| 392 | |
| 393 | return PyFloat_FromDouble(x); |
| 394 | } |
| 395 | |
| 396 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 397 | /* The translation function for each format character is table driven */ |
| 398 | |
| 399 | typedef struct _formatdef { |
| 400 | char format; |
| 401 | int size; |
| 402 | int alignment; |
| 403 | PyObject* (*unpack) Py_PROTO((const char *, |
| 404 | const struct _formatdef *)); |
| 405 | int (*pack) Py_PROTO((char *, |
| 406 | PyObject *, |
| 407 | const struct _formatdef *)); |
| 408 | } formatdef; |
| 409 | |
| 410 | static PyObject * |
| 411 | nu_char(p, f) |
| 412 | const char *p; |
| 413 | const formatdef *f; |
| 414 | { |
| 415 | return PyString_FromStringAndSize(p, 1); |
| 416 | } |
| 417 | |
| 418 | static PyObject * |
| 419 | nu_byte(p, f) |
| 420 | const char *p; |
| 421 | const formatdef *f; |
| 422 | { |
| 423 | return PyInt_FromLong((long) *(signed char *)p); |
| 424 | } |
| 425 | |
| 426 | static PyObject * |
| 427 | nu_ubyte(p, f) |
| 428 | const char *p; |
| 429 | const formatdef *f; |
| 430 | { |
| 431 | return PyInt_FromLong((long) *(unsigned char *)p); |
| 432 | } |
| 433 | |
| 434 | static PyObject * |
| 435 | nu_short(p, f) |
| 436 | const char *p; |
| 437 | const formatdef *f; |
| 438 | { |
| 439 | return PyInt_FromLong((long) *(short *)p); |
| 440 | } |
| 441 | |
| 442 | static PyObject * |
| 443 | nu_ushort(p, f) |
| 444 | const char *p; |
| 445 | const formatdef *f; |
| 446 | { |
| 447 | return PyInt_FromLong((long) *(unsigned short *)p); |
| 448 | } |
| 449 | |
| 450 | static PyObject * |
| 451 | nu_int(p, f) |
| 452 | const char *p; |
| 453 | const formatdef *f; |
| 454 | { |
| 455 | return PyInt_FromLong((long) *(int *)p); |
| 456 | } |
| 457 | |
| 458 | static PyObject * |
| 459 | nu_uint(p, f) |
| 460 | const char *p; |
| 461 | const formatdef *f; |
| 462 | { |
| 463 | unsigned int x = *(unsigned int *)p; |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 464 | return PyLong_FromUnsignedLong((unsigned long)x); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | static PyObject * |
| 468 | nu_long(p, f) |
| 469 | const char *p; |
| 470 | const formatdef *f; |
| 471 | { |
| 472 | return PyInt_FromLong(*(long *)p); |
| 473 | } |
| 474 | |
| 475 | static PyObject * |
| 476 | nu_ulong(p, f) |
| 477 | const char *p; |
| 478 | const formatdef *f; |
| 479 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 480 | return PyLong_FromUnsignedLong(*(unsigned long *)p); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | static PyObject * |
| 484 | nu_float(p, f) |
| 485 | const char *p; |
| 486 | const formatdef *f; |
| 487 | { |
| 488 | float x; |
| 489 | memcpy((char *)&x, p, sizeof(float)); |
| 490 | return PyFloat_FromDouble((double)x); |
| 491 | } |
| 492 | |
| 493 | static PyObject * |
| 494 | nu_double(p, f) |
| 495 | const char *p; |
| 496 | const formatdef *f; |
| 497 | { |
| 498 | double x; |
| 499 | memcpy((char *)&x, p, sizeof(double)); |
| 500 | return PyFloat_FromDouble(x); |
| 501 | } |
| 502 | |
| 503 | static int |
| 504 | np_byte(p, v, f) |
| 505 | char *p; |
| 506 | PyObject *v; |
| 507 | const formatdef *f; |
| 508 | { |
| 509 | long x; |
| 510 | if (get_long(v, &x) < 0) |
| 511 | return -1; |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 512 | *p = (char)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | static int |
| 517 | np_char(p, v, f) |
| 518 | char *p; |
| 519 | PyObject *v; |
| 520 | const formatdef *f; |
| 521 | { |
| 522 | if (!PyString_Check(v) || PyString_Size(v) != 1) { |
| 523 | PyErr_SetString(StructError, |
| 524 | "char format require string of length 1"); |
| 525 | return -1; |
| 526 | } |
| 527 | *p = *PyString_AsString(v); |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | static int |
| 532 | np_short(p, v, f) |
| 533 | char *p; |
| 534 | PyObject *v; |
| 535 | const formatdef *f; |
| 536 | { |
| 537 | long x; |
| 538 | if (get_long(v, &x) < 0) |
| 539 | return -1; |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 540 | * (short *)p = (short)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | static int |
| 545 | np_int(p, v, f) |
| 546 | char *p; |
| 547 | PyObject *v; |
| 548 | const formatdef *f; |
| 549 | { |
| 550 | long x; |
| 551 | if (get_long(v, &x) < 0) |
| 552 | return -1; |
| 553 | * (int *)p = x; |
| 554 | return 0; |
| 555 | } |
| 556 | |
| 557 | static int |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 558 | np_uint(p, v, f) |
| 559 | char *p; |
| 560 | PyObject *v; |
| 561 | const formatdef *f; |
| 562 | { |
| 563 | unsigned long x; |
| 564 | if (get_ulong(v, &x) < 0) |
| 565 | return -1; |
| 566 | * (unsigned int *)p = x; |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 571 | np_long(p, v, f) |
| 572 | char *p; |
| 573 | PyObject *v; |
| 574 | const formatdef *f; |
| 575 | { |
| 576 | long x; |
| 577 | if (get_long(v, &x) < 0) |
| 578 | return -1; |
| 579 | * (long *)p = x; |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | static int |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 584 | np_ulong(p, v, f) |
| 585 | char *p; |
| 586 | PyObject *v; |
| 587 | const formatdef *f; |
| 588 | { |
| 589 | unsigned long x; |
| 590 | if (get_ulong(v, &x) < 0) |
| 591 | return -1; |
| 592 | * (unsigned long *)p = x; |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 597 | np_float(p, v, f) |
| 598 | char *p; |
| 599 | PyObject *v; |
| 600 | const formatdef *f; |
| 601 | { |
| 602 | float x = (float)PyFloat_AsDouble(v); |
| 603 | if (x == -1 && PyErr_Occurred()) { |
| 604 | PyErr_SetString(StructError, |
| 605 | "required argument is not a float"); |
| 606 | return -1; |
| 607 | } |
| 608 | memcpy(p, (char *)&x, sizeof(float)); |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | static int |
| 613 | np_double(p, v, f) |
| 614 | char *p; |
| 615 | PyObject *v; |
| 616 | const formatdef *f; |
| 617 | { |
| 618 | double x = PyFloat_AsDouble(v); |
| 619 | if (x == -1 && PyErr_Occurred()) { |
| 620 | PyErr_SetString(StructError, |
| 621 | "required argument is not a float"); |
| 622 | return -1; |
| 623 | } |
| 624 | memcpy(p, (char *)&x, sizeof(double)); |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | static formatdef native_table[] = { |
| 629 | {'x', sizeof(char), 0, NULL}, |
| 630 | {'b', sizeof(char), 0, nu_byte, np_byte}, |
| 631 | {'B', sizeof(char), 0, nu_ubyte, np_byte}, |
| 632 | {'c', sizeof(char), 0, nu_char, np_char}, |
| 633 | {'s', sizeof(char), 0, NULL}, |
| 634 | {'h', sizeof(short), SHORT_ALIGN, nu_short, np_short}, |
| 635 | {'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_short}, |
| 636 | {'i', sizeof(int), INT_ALIGN, nu_int, np_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 637 | {'I', sizeof(int), INT_ALIGN, nu_uint, np_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 638 | {'l', sizeof(long), LONG_ALIGN, nu_long, np_long}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 639 | {'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 640 | {'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float}, |
| 641 | {'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double}, |
| 642 | {0} |
| 643 | }; |
| 644 | |
| 645 | static PyObject * |
| 646 | bu_int(p, f) |
| 647 | const char *p; |
| 648 | const formatdef *f; |
| 649 | { |
| 650 | long x = 0; |
| 651 | int i = f->size; |
| 652 | do { |
| 653 | x = (x<<8) | (*p++ & 0xFF); |
| 654 | } while (--i > 0); |
| 655 | i = 8*(sizeof(long) - f->size); |
| 656 | if (i) { |
| 657 | x <<= i; |
| 658 | x >>= i; |
| 659 | } |
| 660 | return PyInt_FromLong(x); |
| 661 | } |
| 662 | |
| 663 | static PyObject * |
| 664 | bu_uint(p, f) |
| 665 | const char *p; |
| 666 | const formatdef *f; |
| 667 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 668 | unsigned long x = 0; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 669 | int i = f->size; |
| 670 | do { |
| 671 | x = (x<<8) | (*p++ & 0xFF); |
| 672 | } while (--i > 0); |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 673 | return PyLong_FromUnsignedLong(x); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 674 | } |
| 675 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 676 | static PyObject * |
| 677 | bu_float(p, f) |
| 678 | const char *p; |
| 679 | const formatdef *f; |
| 680 | { |
| 681 | return unpack_float(p, 1); |
| 682 | } |
| 683 | |
| 684 | static PyObject * |
| 685 | bu_double(p, f) |
| 686 | const char *p; |
| 687 | const formatdef *f; |
| 688 | { |
| 689 | return unpack_double(p, 1); |
| 690 | } |
| 691 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 692 | static int |
| 693 | bp_int(p, v, f) |
| 694 | char *p; |
| 695 | PyObject *v; |
| 696 | const formatdef *f; |
| 697 | { |
| 698 | long x; |
| 699 | int i; |
| 700 | if (get_long(v, &x) < 0) |
| 701 | return -1; |
| 702 | i = f->size; |
| 703 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 704 | p[--i] = (char)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 705 | x >>= 8; |
| 706 | } while (i > 0); |
| 707 | return 0; |
| 708 | } |
| 709 | |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 710 | static int |
| 711 | bp_uint(p, v, f) |
| 712 | char *p; |
| 713 | PyObject *v; |
| 714 | const formatdef *f; |
| 715 | { |
| 716 | unsigned long x; |
| 717 | int i; |
| 718 | if (get_ulong(v, &x) < 0) |
| 719 | return -1; |
| 720 | i = f->size; |
| 721 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 722 | p[--i] = (char)x; |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 723 | x >>= 8; |
| 724 | } while (i > 0); |
| 725 | return 0; |
| 726 | } |
| 727 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 728 | static int |
| 729 | bp_float(p, v, f) |
| 730 | char *p; |
| 731 | PyObject *v; |
| 732 | const formatdef *f; |
| 733 | { |
| 734 | double x = PyFloat_AsDouble(v); |
| 735 | if (x == -1 && PyErr_Occurred()) { |
| 736 | PyErr_SetString(StructError, |
| 737 | "required argument is not a float"); |
| 738 | return -1; |
| 739 | } |
| 740 | return pack_float(x, p, 1); |
| 741 | } |
| 742 | |
| 743 | static int |
| 744 | bp_double(p, v, f) |
| 745 | char *p; |
| 746 | PyObject *v; |
| 747 | const formatdef *f; |
| 748 | { |
| 749 | double x = PyFloat_AsDouble(v); |
| 750 | if (x == -1 && PyErr_Occurred()) { |
| 751 | PyErr_SetString(StructError, |
| 752 | "required argument is not a float"); |
| 753 | return -1; |
| 754 | } |
| 755 | return pack_double(x, p, 1); |
| 756 | } |
| 757 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 758 | static formatdef bigendian_table[] = { |
| 759 | {'x', 1, 0, NULL}, |
| 760 | {'b', 1, 0, bu_int, bp_int}, |
| 761 | {'B', 1, 0, bu_uint, bp_int}, |
| 762 | {'c', 1, 0, nu_char, np_char}, |
| 763 | {'s', 1, 0, NULL}, |
| 764 | {'h', 2, 0, bu_int, bp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 765 | {'H', 2, 0, bu_uint, bp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 766 | {'i', 4, 0, bu_int, bp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 767 | {'I', 4, 0, bu_uint, bp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 768 | {'l', 4, 0, bu_int, bp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 769 | {'L', 4, 0, bu_uint, bp_uint}, |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 770 | {'f', 4, 0, bu_float, bp_float}, |
| 771 | {'d', 8, 0, bu_double, bp_double}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 772 | {0} |
| 773 | }; |
| 774 | |
| 775 | static PyObject * |
| 776 | lu_int(p, f) |
| 777 | const char *p; |
| 778 | const formatdef *f; |
| 779 | { |
| 780 | long x = 0; |
| 781 | int i = f->size; |
| 782 | do { |
| 783 | x = (x<<8) | (p[--i] & 0xFF); |
| 784 | } while (i > 0); |
| 785 | i = 8*(sizeof(long) - f->size); |
| 786 | if (i) { |
| 787 | x <<= i; |
| 788 | x >>= i; |
| 789 | } |
| 790 | return PyInt_FromLong(x); |
| 791 | } |
| 792 | |
| 793 | static PyObject * |
| 794 | lu_uint(p, f) |
| 795 | const char *p; |
| 796 | const formatdef *f; |
| 797 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 798 | unsigned long x = 0; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 799 | int i = f->size; |
| 800 | do { |
| 801 | x = (x<<8) | (p[--i] & 0xFF); |
| 802 | } while (i > 0); |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 803 | return PyLong_FromUnsignedLong(x); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 804 | } |
| 805 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 806 | static PyObject * |
| 807 | lu_float(p, f) |
| 808 | const char *p; |
| 809 | const formatdef *f; |
| 810 | { |
| 811 | return unpack_float(p+3, -1); |
| 812 | } |
| 813 | |
| 814 | static PyObject * |
| 815 | lu_double(p, f) |
| 816 | const char *p; |
| 817 | const formatdef *f; |
| 818 | { |
| 819 | return unpack_double(p+7, -1); |
| 820 | } |
| 821 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 822 | static int |
| 823 | lp_int(p, v, f) |
| 824 | char *p; |
| 825 | PyObject *v; |
| 826 | const formatdef *f; |
| 827 | { |
| 828 | long x; |
| 829 | int i; |
| 830 | if (get_long(v, &x) < 0) |
| 831 | return -1; |
| 832 | i = f->size; |
| 833 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 834 | *p++ = (char)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 835 | x >>= 8; |
| 836 | } while (--i > 0); |
| 837 | return 0; |
| 838 | } |
| 839 | |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 840 | static int |
| 841 | lp_uint(p, v, f) |
| 842 | char *p; |
| 843 | PyObject *v; |
| 844 | const formatdef *f; |
| 845 | { |
| 846 | unsigned long x; |
| 847 | int i; |
| 848 | if (get_ulong(v, &x) < 0) |
| 849 | return -1; |
| 850 | i = f->size; |
| 851 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 852 | *p++ = (char)x; |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 853 | x >>= 8; |
| 854 | } while (--i > 0); |
| 855 | return 0; |
| 856 | } |
| 857 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 858 | static int |
| 859 | lp_float(p, v, f) |
| 860 | char *p; |
| 861 | PyObject *v; |
| 862 | const formatdef *f; |
| 863 | { |
| 864 | double x = PyFloat_AsDouble(v); |
| 865 | if (x == -1 && PyErr_Occurred()) { |
| 866 | PyErr_SetString(StructError, |
| 867 | "required argument is not a float"); |
| 868 | return -1; |
| 869 | } |
| 870 | return pack_float(x, p+3, -1); |
| 871 | } |
| 872 | |
| 873 | static int |
| 874 | lp_double(p, v, f) |
| 875 | char *p; |
| 876 | PyObject *v; |
| 877 | const formatdef *f; |
| 878 | { |
| 879 | double x = PyFloat_AsDouble(v); |
| 880 | if (x == -1 && PyErr_Occurred()) { |
| 881 | PyErr_SetString(StructError, |
| 882 | "required argument is not a float"); |
| 883 | return -1; |
| 884 | } |
| 885 | return pack_double(x, p+7, -1); |
| 886 | } |
| 887 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 888 | static formatdef lilendian_table[] = { |
| 889 | {'x', 1, 0, NULL}, |
| 890 | {'b', 1, 0, lu_int, lp_int}, |
| 891 | {'B', 1, 0, lu_uint, lp_int}, |
| 892 | {'c', 1, 0, nu_char, np_char}, |
| 893 | {'s', 1, 0, NULL}, |
| 894 | {'h', 2, 0, lu_int, lp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 895 | {'H', 2, 0, lu_uint, lp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 896 | {'i', 4, 0, lu_int, lp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 897 | {'I', 4, 0, lu_uint, lp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 898 | {'l', 4, 0, lu_int, lp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 899 | {'L', 4, 0, lu_uint, lp_uint}, |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 900 | {'f', 4, 0, lu_float, lp_float}, |
| 901 | {'d', 8, 0, lu_double, lp_double}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 902 | {0} |
| 903 | }; |
| 904 | |
| 905 | |
| 906 | static const formatdef * |
| 907 | whichtable(pfmt) |
| 908 | const char **pfmt; |
| 909 | { |
| 910 | const char *fmt = (*pfmt)++; /* May be backed out of later */ |
| 911 | switch (*fmt) { |
| 912 | case '<': |
| 913 | return lilendian_table; |
| 914 | case '>': |
| 915 | case '!': /* Network byte order is big-endian */ |
| 916 | return bigendian_table; |
| 917 | case '=': { /* Host byte order -- different from native in aligment! */ |
| 918 | int n = 1; |
| 919 | char *p = (char *) &n; |
| 920 | if (*p == 1) |
| 921 | return lilendian_table; |
| 922 | else |
| 923 | return bigendian_table; |
| 924 | } |
| 925 | default: |
| 926 | --*pfmt; /* Back out of pointer increment */ |
| 927 | /* Fall through */ |
| 928 | case '@': |
| 929 | return native_table; |
| 930 | } |
| 931 | } |
| 932 | |
| 933 | |
| 934 | /* Get the table entry for a format code */ |
| 935 | |
| 936 | static const formatdef * |
| 937 | getentry(c, f) |
| 938 | int c; |
| 939 | const formatdef *f; |
| 940 | { |
| 941 | for (; f->format != '\0'; f++) { |
| 942 | if (f->format == c) { |
| 943 | return f; |
| 944 | } |
| 945 | } |
| 946 | PyErr_SetString(StructError, "bad char in struct format"); |
| 947 | return NULL; |
| 948 | } |
| 949 | |
| 950 | |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 951 | /* Align a size according to a format code */ |
| 952 | |
| 953 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 954 | align(size, c, e) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 955 | int size; |
| 956 | int c; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 957 | const formatdef *e; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 958 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 959 | if (e->format == c) { |
| 960 | if (e->alignment) { |
| 961 | size = ((size + e->alignment - 1) |
| 962 | / e->alignment) |
| 963 | * e->alignment; |
| 964 | } |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 965 | } |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 966 | return size; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 967 | } |
| 968 | |
| 969 | |
| 970 | /* calculate the size of a format string */ |
| 971 | |
| 972 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 973 | calcsize(fmt, f) |
| 974 | const char *fmt; |
| 975 | const formatdef *f; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 976 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 977 | const formatdef *e; |
| 978 | const char *s; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 979 | char c; |
| 980 | int size, num, itemsize, x; |
| 981 | |
| 982 | s = fmt; |
| 983 | size = 0; |
| 984 | while ((c = *s++) != '\0') { |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame^] | 985 | if (isspace(c)) |
| 986 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 987 | if ('0' <= c && c <= '9') { |
| 988 | num = c - '0'; |
| 989 | while ('0' <= (c = *s++) && c <= '9') { |
| 990 | x = num*10 + (c - '0'); |
| 991 | if (x/10 != num) { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 992 | PyErr_SetString( |
| 993 | StructError, |
| 994 | "overflow in item count"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 995 | return -1; |
| 996 | } |
| 997 | num = x; |
| 998 | } |
| 999 | if (c == '\0') |
| 1000 | break; |
| 1001 | } |
| 1002 | else |
| 1003 | num = 1; |
| 1004 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1005 | e = getentry(c, f); |
| 1006 | if (e == NULL) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1007 | return -1; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1008 | itemsize = e->size; |
| 1009 | size = align(size, c, e); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1010 | x = num * itemsize; |
| 1011 | size += x; |
| 1012 | if (x/itemsize != num || size < 0) { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1013 | PyErr_SetString(StructError, |
| 1014 | "total struct size too long"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1015 | return -1; |
| 1016 | } |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1017 | } |
| 1018 | |
| 1019 | return size; |
| 1020 | } |
| 1021 | |
| 1022 | |
| 1023 | /* pack(fmt, v1, v2, ...) --> string */ |
| 1024 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1025 | static PyObject * |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1026 | struct_calcsize(self, args) |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1027 | PyObject *self; /* Not used */ |
| 1028 | PyObject *args; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1029 | { |
| 1030 | char *fmt; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1031 | const formatdef *f; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1032 | int size; |
| 1033 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1034 | if (!PyArg_ParseTuple(args, "s", &fmt)) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1035 | return NULL; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1036 | f = whichtable(&fmt); |
| 1037 | size = calcsize(fmt, f); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1038 | if (size < 0) |
| 1039 | return NULL; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1040 | return PyInt_FromLong((long)size); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1041 | } |
| 1042 | |
| 1043 | |
| 1044 | /* pack(fmt, v1, v2, ...) --> string */ |
| 1045 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1046 | static PyObject * |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1047 | struct_pack(self, args) |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1048 | PyObject *self; /* Not used */ |
| 1049 | PyObject *args; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1050 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1051 | const formatdef *f, *e; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1052 | PyObject *format, *result, *v; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1053 | char *fmt; |
| 1054 | int size, num; |
| 1055 | int i, n; |
Guido van Rossum | b9d338c | 1997-01-03 15:40:33 +0000 | [diff] [blame] | 1056 | char *s, *res, *restart, *nres; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1057 | char c; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1058 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1059 | if (args == NULL || !PyTuple_Check(args) || |
| 1060 | (n = PyTuple_Size(args)) < 1) |
| 1061 | { |
| 1062 | PyErr_BadArgument(); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1063 | return NULL; |
| 1064 | } |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1065 | format = PyTuple_GetItem(args, 0); |
| 1066 | if (!PyArg_Parse(format, "s", &fmt)) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1067 | return NULL; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1068 | f = whichtable(&fmt); |
| 1069 | size = calcsize(fmt, f); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1070 | if (size < 0) |
| 1071 | return NULL; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1072 | result = PyString_FromStringAndSize((char *)NULL, size); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1073 | if (result == NULL) |
| 1074 | return NULL; |
| 1075 | |
| 1076 | s = fmt; |
| 1077 | i = 1; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1078 | res = restart = PyString_AsString(result); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1079 | |
| 1080 | while ((c = *s++) != '\0') { |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame^] | 1081 | if (isspace(c)) |
| 1082 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1083 | if ('0' <= c && c <= '9') { |
| 1084 | num = c - '0'; |
| 1085 | while ('0' <= (c = *s++) && c <= '9') |
| 1086 | num = num*10 + (c - '0'); |
| 1087 | if (c == '\0') |
| 1088 | break; |
| 1089 | } |
| 1090 | else |
| 1091 | num = 1; |
| 1092 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1093 | e = getentry(c, f); |
| 1094 | if (e == NULL) |
| 1095 | goto fail; |
Guido van Rossum | b9d338c | 1997-01-03 15:40:33 +0000 | [diff] [blame] | 1096 | nres = restart + align((int)(res-restart), c, e); |
| 1097 | /* Fill padd bytes with zeros */ |
| 1098 | while (res < nres) |
| 1099 | *res++ = '\0'; |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1100 | if (num == 0 && c != 's') |
| 1101 | continue; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1102 | do { |
| 1103 | if (c == 'x') { |
| 1104 | /* doesn't consume arguments */ |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1105 | memset(res, '\0', num); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1106 | res += num; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1107 | break; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1108 | } |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1109 | if (i >= n) { |
| 1110 | PyErr_SetString(StructError, |
| 1111 | "insufficient arguments to pack"); |
| 1112 | goto fail; |
| 1113 | } |
| 1114 | v = PyTuple_GetItem(args, i++); |
| 1115 | if (v == NULL) |
| 1116 | goto fail; |
| 1117 | if (c == 's') { |
| 1118 | /* num is string size, not repeat count */ |
| 1119 | int n; |
| 1120 | if (!PyString_Check(v)) { |
| 1121 | PyErr_SetString(StructError, |
| 1122 | "argument for 's' must be a string"); |
| 1123 | goto fail; |
| 1124 | } |
| 1125 | n = PyString_Size(v); |
| 1126 | if (n > num) |
| 1127 | n = num; |
| 1128 | if (n > 0) |
| 1129 | memcpy(res, PyString_AsString(v), n); |
| 1130 | if (n < num) |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1131 | memset(res+n, '\0', num-n); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1132 | res += num; |
| 1133 | break; |
| 1134 | } |
| 1135 | else { |
| 1136 | if (e->pack(res, v, e) < 0) |
| 1137 | goto fail; |
| 1138 | res += e->size; |
| 1139 | } |
| 1140 | } while (--num > 0); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1141 | } |
| 1142 | |
| 1143 | if (i < n) { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1144 | PyErr_SetString(StructError, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1145 | "too many arguments for pack format"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1146 | goto fail; |
| 1147 | } |
| 1148 | |
| 1149 | return result; |
| 1150 | |
| 1151 | fail: |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1152 | Py_DECREF(result); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1153 | return NULL; |
| 1154 | } |
| 1155 | |
| 1156 | |
| 1157 | /* unpack(fmt, string) --> (v1, v2, ...) */ |
| 1158 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1159 | static PyObject * |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1160 | struct_unpack(self, args) |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1161 | PyObject *self; /* Not used */ |
| 1162 | PyObject *args; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1163 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1164 | const formatdef *f, *e; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1165 | char *str, *start, *fmt, *s; |
| 1166 | char c; |
Barry Warsaw | b9a781e | 1997-01-03 00:26:28 +0000 | [diff] [blame] | 1167 | int len, size, num; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1168 | PyObject *res, *v; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1169 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1170 | if (!PyArg_ParseTuple(args, "ss#", &fmt, &start, &len)) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1171 | return NULL; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1172 | f = whichtable(&fmt); |
| 1173 | size = calcsize(fmt, f); |
| 1174 | if (size < 0) |
| 1175 | return NULL; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1176 | if (size != len) { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1177 | PyErr_SetString(StructError, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1178 | "unpack str size does not match format"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1179 | return NULL; |
| 1180 | } |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1181 | res = PyList_New(0); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1182 | if (res == NULL) |
| 1183 | return NULL; |
| 1184 | str = start; |
| 1185 | s = fmt; |
| 1186 | while ((c = *s++) != '\0') { |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame^] | 1187 | if (isspace(c)) |
| 1188 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1189 | if ('0' <= c && c <= '9') { |
| 1190 | num = c - '0'; |
| 1191 | while ('0' <= (c = *s++) && c <= '9') |
| 1192 | num = num*10 + (c - '0'); |
| 1193 | if (c == '\0') |
| 1194 | break; |
| 1195 | } |
| 1196 | else |
| 1197 | num = 1; |
| 1198 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1199 | e = getentry(c, f); |
| 1200 | if (e == NULL) |
| 1201 | goto fail; |
| 1202 | str = start + align((int)(str-start), c, e); |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1203 | if (num == 0 && c != 's') |
| 1204 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1205 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1206 | do { |
| 1207 | if (c == 'x') { |
| 1208 | str += num; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1209 | break; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1210 | } |
| 1211 | if (c == 's') { |
| 1212 | /* num is string size, not repeat count */ |
| 1213 | v = PyString_FromStringAndSize(str, num); |
| 1214 | if (v == NULL) |
| 1215 | goto fail; |
| 1216 | str += num; |
| 1217 | num = 0; |
| 1218 | } |
| 1219 | else { |
| 1220 | v = e->unpack(str, e); |
| 1221 | if (v == NULL) |
| 1222 | goto fail; |
| 1223 | str += e->size; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1224 | } |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1225 | if (v == NULL || PyList_Append(res, v) < 0) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1226 | goto fail; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1227 | Py_DECREF(v); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1228 | } while (--num > 0); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1229 | } |
| 1230 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1231 | v = PyList_AsTuple(res); |
| 1232 | Py_DECREF(res); |
| 1233 | return v; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1234 | |
| 1235 | fail: |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1236 | Py_DECREF(res); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1237 | return NULL; |
| 1238 | } |
| 1239 | |
Guido van Rossum | 90ddb7b | 1992-08-19 16:44:15 +0000 | [diff] [blame] | 1240 | |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1241 | /* List of functions */ |
| 1242 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1243 | static PyMethodDef struct_methods[] = { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1244 | {"calcsize", struct_calcsize, METH_VARARGS}, |
| 1245 | {"pack", struct_pack, METH_VARARGS}, |
| 1246 | {"unpack", struct_unpack, METH_VARARGS}, |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1247 | {NULL, NULL} /* sentinel */ |
| 1248 | }; |
| 1249 | |
| 1250 | |
| 1251 | /* Module initialization */ |
| 1252 | |
| 1253 | void |
| 1254 | initstruct() |
| 1255 | { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1256 | PyObject *m, *d; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1257 | |
| 1258 | /* Create the module and add the functions */ |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1259 | m = Py_InitModule("struct", struct_methods); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1260 | |
| 1261 | /* Add some symbolic constants to the module */ |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1262 | d = PyModule_GetDict(m); |
| 1263 | StructError = PyString_FromString("struct.error"); |
| 1264 | PyDict_SetItemString(d, "error", StructError); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1265 | |
| 1266 | /* Check for errors */ |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1267 | if (PyErr_Occurred()) |
| 1268 | Py_FatalError("can't initialize module struct"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1269 | } |