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 | |
Guido van Rossum | 414fd48 | 1997-12-19 04:24:24 +0000 | [diff] [blame] | 37 | static char struct__doc__[] = "\ |
| 38 | Functions to convert between Python values and C structs.\n\ |
| 39 | Python strings are used to hold the data representing the C struct\n\ |
| 40 | and also as format strings to describe the layout of data in the C struct.\n\ |
| 41 | \n\ |
| 42 | The optional first format char indicates byte ordering and alignment:\n\ |
| 43 | @: native w/native alignment(default)\n\ |
| 44 | =: native w/standard alignment\n\ |
| 45 | <: little-endian, std. alignment\n\ |
| 46 | >: big-endian, std. alignment\n\ |
| 47 | !: network, std (same as >)\n\ |
| 48 | \n\ |
| 49 | The remaining chars indicate types of args and must match exactly;\n\ |
| 50 | these can be preceded by a decimal repeat count:\n\ |
| 51 | x: pad byte (no data); c:char; b:signed byte; B:unsigned byte;\n\ |
| 52 | h:short; H:unsigned short; i:int; I:unsigned int;\n\ |
| 53 | l:long; L:unsigned long; f:float; d:double.\n\ |
| 54 | Special cases (preceding decimal count indicates length):\n\ |
| 55 | s:string (array of char); p: pascal string (w. count byte).\n\ |
Guido van Rossum | 78694d9 | 1998-09-18 14:14:13 +0000 | [diff] [blame] | 56 | Special case (only available in native format):\n\ |
| 57 | P:an integer type that is wide enough to hold a pointer.\n\ |
Guido van Rossum | 414fd48 | 1997-12-19 04:24:24 +0000 | [diff] [blame] | 58 | Whitespace between formats is ignored.\n\ |
| 59 | \n\ |
| 60 | The variable struct.error is an exception raised on errors."; |
| 61 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 62 | #include "Python.h" |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 63 | #include "mymath.h" |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 64 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 65 | #include <limits.h> |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame] | 66 | #include <ctype.h> |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 67 | |
| 68 | |
| 69 | /* Exception */ |
| 70 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 71 | static PyObject *StructError; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 72 | |
| 73 | |
| 74 | /* Define various structs to figure out the alignments of types */ |
| 75 | |
Jack Jansen | 971e1df | 1995-02-02 14:29:10 +0000 | [diff] [blame] | 76 | #ifdef __MWERKS__ |
| 77 | /* |
| 78 | ** XXXX We have a problem here. There are no unique alignment rules |
| 79 | ** on the PowerPC mac. |
| 80 | */ |
| 81 | #ifdef __powerc |
| 82 | #pragma options align=mac68k |
| 83 | #endif |
| 84 | #endif /* __MWERKS__ */ |
| 85 | |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 86 | typedef struct { char c; short x; } s_short; |
| 87 | typedef struct { char c; int x; } s_int; |
| 88 | typedef struct { char c; long x; } s_long; |
| 89 | typedef struct { char c; float x; } s_float; |
| 90 | typedef struct { char c; double x; } s_double; |
Guido van Rossum | 78694d9 | 1998-09-18 14:14:13 +0000 | [diff] [blame] | 91 | typedef struct { char c; void *x; } s_void_p; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 92 | |
| 93 | #define SHORT_ALIGN (sizeof(s_short) - sizeof(short)) |
| 94 | #define INT_ALIGN (sizeof(s_int) - sizeof(int)) |
| 95 | #define LONG_ALIGN (sizeof(s_long) - sizeof(long)) |
| 96 | #define FLOAT_ALIGN (sizeof(s_float) - sizeof(float)) |
| 97 | #define DOUBLE_ALIGN (sizeof(s_double) - sizeof(double)) |
Guido van Rossum | 78694d9 | 1998-09-18 14:14:13 +0000 | [diff] [blame] | 98 | #define VOID_P_ALIGN (sizeof(s_void_p) - sizeof(void *)) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 99 | |
Jack Jansen | 971e1df | 1995-02-02 14:29:10 +0000 | [diff] [blame] | 100 | #ifdef __powerc |
| 101 | #pragma options align=reset |
| 102 | #endif |
| 103 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 104 | /* Helper routine to get a Python integer and raise the appropriate error |
| 105 | if it isn't one */ |
| 106 | |
| 107 | static int |
| 108 | get_long(v, p) |
| 109 | PyObject *v; |
| 110 | long *p; |
| 111 | { |
| 112 | long x = PyInt_AsLong(v); |
| 113 | if (x == -1 && PyErr_Occurred()) { |
Fred Drake | d3dbb38 | 1998-05-28 04:35:49 +0000 | [diff] [blame] | 114 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 115 | PyErr_SetString(StructError, |
| 116 | "required argument is not an integer"); |
| 117 | return -1; |
| 118 | } |
| 119 | *p = x; |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 124 | /* Same, but handling unsigned long */ |
| 125 | |
| 126 | static int |
| 127 | get_ulong(v, p) |
| 128 | PyObject *v; |
| 129 | unsigned long *p; |
| 130 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 131 | if (PyLong_Check(v)) { |
| 132 | unsigned long x = PyLong_AsUnsignedLong(v); |
| 133 | if (x == (unsigned long)(-1) && PyErr_Occurred()) |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 134 | return -1; |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 135 | *p = x; |
| 136 | return 0; |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 137 | } |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 138 | else { |
| 139 | return get_long(v, (long *)p); |
| 140 | } |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 144 | /* Floating point helpers */ |
| 145 | |
| 146 | /* These use ANSI/IEEE Standard 754-1985 (Standard for Binary Floating |
| 147 | Point Arithmetic). See the following URL: |
| 148 | http://www.psc.edu/general/software/packages/ieee/ieee.html */ |
| 149 | |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 150 | /* XXX Inf/NaN are not handled quite right (but underflow is!) */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 151 | |
| 152 | static int |
| 153 | pack_float(x, p, incr) |
| 154 | double x; /* The number to pack */ |
| 155 | char *p; /* Where to pack the high order byte */ |
| 156 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 157 | { |
| 158 | int s; |
| 159 | int e; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 160 | double f; |
| 161 | long fbits; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 162 | |
| 163 | if (x < 0) { |
| 164 | s = 1; |
| 165 | x = -x; |
| 166 | } |
| 167 | else |
| 168 | s = 0; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 169 | |
| 170 | f = frexp(x, &e); |
| 171 | |
| 172 | /* Normalize f to be in the range [1.0, 2.0) */ |
| 173 | if (0.5 <= f && f < 1.0) { |
| 174 | f *= 2.0; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 175 | e--; |
| 176 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 177 | else if (f == 0.0) { |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 178 | e = 0; |
| 179 | } |
| 180 | else { |
| 181 | PyErr_SetString(PyExc_SystemError, |
| 182 | "frexp() result out of range"); |
| 183 | return -1; |
| 184 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 185 | |
| 186 | if (e >= 128) { |
| 187 | /* XXX 128 itself is reserved for Inf/NaN */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 188 | PyErr_SetString(PyExc_OverflowError, |
| 189 | "float too large to pack with f format"); |
| 190 | return -1; |
| 191 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 192 | else if (e < -126) { |
| 193 | /* Gradual underflow */ |
| 194 | f = ldexp(f, 126 + e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 195 | e = 0; |
| 196 | } |
Guido van Rossum | 8f3c812 | 1997-11-04 17:12:33 +0000 | [diff] [blame] | 197 | else if (!(e == 0 && f == 0.0)) { |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 198 | e += 127; |
| 199 | f -= 1.0; /* Get rid of leading 1 */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 200 | } |
| 201 | |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 202 | f *= 8388608.0; /* 2**23 */ |
| 203 | fbits = (long) floor(f + 0.5); /* Round */ |
| 204 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 205 | /* First byte */ |
| 206 | *p = (s<<7) | (e>>1); |
| 207 | p += incr; |
| 208 | |
| 209 | /* Second byte */ |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 210 | *p = (char) (((e&1)<<7) | (fbits>>16)); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 211 | p += incr; |
| 212 | |
| 213 | /* Third byte */ |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 214 | *p = (fbits>>8) & 0xFF; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 215 | p += incr; |
| 216 | |
| 217 | /* Fourth byte */ |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 218 | *p = fbits&0xFF; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 219 | |
| 220 | /* Done */ |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | static int |
| 225 | pack_double(x, p, incr) |
| 226 | double x; /* The number to pack */ |
| 227 | char *p; /* Where to pack the high order byte */ |
| 228 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 229 | { |
| 230 | int s; |
| 231 | int e; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 232 | double f; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 233 | long fhi, flo; |
| 234 | |
| 235 | if (x < 0) { |
| 236 | s = 1; |
| 237 | x = -x; |
| 238 | } |
| 239 | else |
| 240 | s = 0; |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 241 | |
| 242 | f = frexp(x, &e); |
| 243 | |
| 244 | /* Normalize f to be in the range [1.0, 2.0) */ |
| 245 | if (0.5 <= f && f < 1.0) { |
| 246 | f *= 2.0; |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 247 | e--; |
| 248 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 249 | else if (f == 0.0) { |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 250 | e = 0; |
| 251 | } |
| 252 | else { |
| 253 | PyErr_SetString(PyExc_SystemError, |
| 254 | "frexp() result out of range"); |
| 255 | return -1; |
| 256 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 257 | |
| 258 | if (e >= 1024) { |
| 259 | /* XXX 1024 itself is reserved for Inf/NaN */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 260 | PyErr_SetString(PyExc_OverflowError, |
| 261 | "float too large to pack with d format"); |
| 262 | return -1; |
| 263 | } |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 264 | else if (e < -1022) { |
| 265 | /* Gradual underflow */ |
| 266 | f = ldexp(f, 1022 + e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 267 | e = 0; |
| 268 | } |
Guido van Rossum | 8f3c812 | 1997-11-04 17:12:33 +0000 | [diff] [blame] | 269 | else if (!(e == 0 && f == 0.0)) { |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 270 | e += 1023; |
| 271 | f -= 1.0; /* Get rid of leading 1 */ |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 272 | } |
| 273 | |
Guido van Rossum | 4ccc531 | 1997-01-02 23:23:20 +0000 | [diff] [blame] | 274 | /* fhi receives the high 28 bits; flo the low 24 bits (== 52 bits) */ |
| 275 | f *= 268435456.0; /* 2**28 */ |
| 276 | fhi = (long) floor(f); /* Truncate */ |
| 277 | f -= (double)fhi; |
| 278 | f *= 16777216.0; /* 2**24 */ |
| 279 | flo = (long) floor(f + 0.5); /* Round */ |
| 280 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 281 | /* First byte */ |
| 282 | *p = (s<<7) | (e>>4); |
| 283 | p += incr; |
| 284 | |
| 285 | /* Second byte */ |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 286 | *p = (char) (((e&0xF)<<4) | (fhi>>24)); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 287 | p += incr; |
| 288 | |
| 289 | /* Third byte */ |
| 290 | *p = (fhi>>16) & 0xFF; |
| 291 | p += incr; |
| 292 | |
| 293 | /* Fourth byte */ |
| 294 | *p = (fhi>>8) & 0xFF; |
| 295 | p += incr; |
| 296 | |
| 297 | /* Fifth byte */ |
| 298 | *p = fhi & 0xFF; |
| 299 | p += incr; |
| 300 | |
| 301 | /* Sixth byte */ |
| 302 | *p = (flo>>16) & 0xFF; |
| 303 | p += incr; |
| 304 | |
| 305 | /* Seventh byte */ |
| 306 | *p = (flo>>8) & 0xFF; |
| 307 | p += incr; |
| 308 | |
| 309 | /* Eighth byte */ |
| 310 | *p = flo & 0xFF; |
| 311 | p += incr; |
| 312 | |
| 313 | /* Done */ |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static PyObject * |
| 318 | unpack_float(p, incr) |
| 319 | char *p; /* Where the high order byte is */ |
| 320 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 321 | { |
| 322 | int s; |
| 323 | int e; |
| 324 | long f; |
| 325 | double x; |
| 326 | |
| 327 | /* First byte */ |
| 328 | s = (*p>>7) & 1; |
| 329 | e = (*p & 0x7F) << 1; |
| 330 | p += incr; |
| 331 | |
| 332 | /* Second byte */ |
| 333 | e |= (*p>>7) & 1; |
| 334 | f = (*p & 0x7F) << 16; |
| 335 | p += incr; |
| 336 | |
| 337 | /* Third byte */ |
| 338 | f |= (*p & 0xFF) << 8; |
| 339 | p += incr; |
| 340 | |
| 341 | /* Fourth byte */ |
| 342 | f |= *p & 0xFF; |
| 343 | |
| 344 | x = (double)f / 8388608.0; |
| 345 | |
| 346 | /* XXX This sadly ignores Inf/NaN issues */ |
Guido van Rossum | 07ef655 | 1997-01-02 22:31:07 +0000 | [diff] [blame] | 347 | if (e == 0) |
| 348 | e = -126; |
| 349 | else { |
| 350 | x += 1.0; |
| 351 | e -= 127; |
| 352 | } |
| 353 | x = ldexp(x, e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 354 | |
| 355 | if (s) |
| 356 | x = -x; |
| 357 | |
| 358 | return PyFloat_FromDouble(x); |
| 359 | } |
| 360 | |
| 361 | static PyObject * |
| 362 | unpack_double(p, incr) |
| 363 | char *p; /* Where the high order byte is */ |
| 364 | int incr; /* 1 for big-endian; -1 for little-endian */ |
| 365 | { |
| 366 | int s; |
| 367 | int e; |
| 368 | long fhi, flo; |
| 369 | double x; |
| 370 | |
| 371 | /* First byte */ |
| 372 | s = (*p>>7) & 1; |
| 373 | e = (*p & 0x7F) << 4; |
| 374 | p += incr; |
| 375 | |
| 376 | /* Second byte */ |
| 377 | e |= (*p>>4) & 0xF; |
| 378 | fhi = (*p & 0xF) << 24; |
| 379 | p += incr; |
| 380 | |
| 381 | /* Third byte */ |
| 382 | fhi |= (*p & 0xFF) << 16; |
| 383 | p += incr; |
| 384 | |
| 385 | /* Fourth byte */ |
| 386 | fhi |= (*p & 0xFF) << 8; |
| 387 | p += incr; |
| 388 | |
| 389 | /* Fifth byte */ |
| 390 | fhi |= *p & 0xFF; |
| 391 | p += incr; |
| 392 | |
| 393 | /* Sixth byte */ |
| 394 | flo = (*p & 0xFF) << 16; |
| 395 | p += incr; |
| 396 | |
| 397 | /* Seventh byte */ |
| 398 | flo |= (*p & 0xFF) << 8; |
| 399 | p += incr; |
| 400 | |
| 401 | /* Eighth byte */ |
| 402 | flo |= *p & 0xFF; |
| 403 | p += incr; |
| 404 | |
| 405 | x = (double)fhi + (double)flo / 16777216.0; /* 2**24 */ |
| 406 | x /= 268435456.0; /* 2**28 */ |
| 407 | |
| 408 | /* XXX This sadly ignores Inf/NaN */ |
Guido van Rossum | 07ef655 | 1997-01-02 22:31:07 +0000 | [diff] [blame] | 409 | if (e == 0) |
| 410 | e = -1022; |
| 411 | else { |
| 412 | x += 1.0; |
| 413 | e -= 1023; |
| 414 | } |
| 415 | x = ldexp(x, e); |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 416 | |
| 417 | if (s) |
| 418 | x = -x; |
| 419 | |
| 420 | return PyFloat_FromDouble(x); |
| 421 | } |
| 422 | |
| 423 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 424 | /* The translation function for each format character is table driven */ |
| 425 | |
| 426 | typedef struct _formatdef { |
| 427 | char format; |
| 428 | int size; |
| 429 | int alignment; |
| 430 | PyObject* (*unpack) Py_PROTO((const char *, |
| 431 | const struct _formatdef *)); |
| 432 | int (*pack) Py_PROTO((char *, |
| 433 | PyObject *, |
| 434 | const struct _formatdef *)); |
| 435 | } formatdef; |
| 436 | |
| 437 | static PyObject * |
| 438 | nu_char(p, f) |
| 439 | const char *p; |
| 440 | const formatdef *f; |
| 441 | { |
| 442 | return PyString_FromStringAndSize(p, 1); |
| 443 | } |
| 444 | |
| 445 | static PyObject * |
| 446 | nu_byte(p, f) |
| 447 | const char *p; |
| 448 | const formatdef *f; |
| 449 | { |
| 450 | return PyInt_FromLong((long) *(signed char *)p); |
| 451 | } |
| 452 | |
| 453 | static PyObject * |
| 454 | nu_ubyte(p, f) |
| 455 | const char *p; |
| 456 | const formatdef *f; |
| 457 | { |
| 458 | return PyInt_FromLong((long) *(unsigned char *)p); |
| 459 | } |
| 460 | |
| 461 | static PyObject * |
| 462 | nu_short(p, f) |
| 463 | const char *p; |
| 464 | const formatdef *f; |
| 465 | { |
| 466 | return PyInt_FromLong((long) *(short *)p); |
| 467 | } |
| 468 | |
| 469 | static PyObject * |
| 470 | nu_ushort(p, f) |
| 471 | const char *p; |
| 472 | const formatdef *f; |
| 473 | { |
| 474 | return PyInt_FromLong((long) *(unsigned short *)p); |
| 475 | } |
| 476 | |
| 477 | static PyObject * |
| 478 | nu_int(p, f) |
| 479 | const char *p; |
| 480 | const formatdef *f; |
| 481 | { |
| 482 | return PyInt_FromLong((long) *(int *)p); |
| 483 | } |
| 484 | |
| 485 | static PyObject * |
| 486 | nu_uint(p, f) |
| 487 | const char *p; |
| 488 | const formatdef *f; |
| 489 | { |
| 490 | unsigned int x = *(unsigned int *)p; |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 491 | return PyLong_FromUnsignedLong((unsigned long)x); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 492 | } |
| 493 | |
| 494 | static PyObject * |
| 495 | nu_long(p, f) |
| 496 | const char *p; |
| 497 | const formatdef *f; |
| 498 | { |
| 499 | return PyInt_FromLong(*(long *)p); |
| 500 | } |
| 501 | |
| 502 | static PyObject * |
| 503 | nu_ulong(p, f) |
| 504 | const char *p; |
| 505 | const formatdef *f; |
| 506 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 507 | return PyLong_FromUnsignedLong(*(unsigned long *)p); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 508 | } |
| 509 | |
| 510 | static PyObject * |
| 511 | nu_float(p, f) |
| 512 | const char *p; |
| 513 | const formatdef *f; |
| 514 | { |
| 515 | float x; |
| 516 | memcpy((char *)&x, p, sizeof(float)); |
| 517 | return PyFloat_FromDouble((double)x); |
| 518 | } |
| 519 | |
| 520 | static PyObject * |
| 521 | nu_double(p, f) |
| 522 | const char *p; |
| 523 | const formatdef *f; |
| 524 | { |
| 525 | double x; |
| 526 | memcpy((char *)&x, p, sizeof(double)); |
| 527 | return PyFloat_FromDouble(x); |
| 528 | } |
| 529 | |
Guido van Rossum | 78694d9 | 1998-09-18 14:14:13 +0000 | [diff] [blame] | 530 | static PyObject * |
| 531 | nu_void_p(p, f) |
| 532 | const char *p; |
| 533 | const formatdef *f; |
| 534 | { |
| 535 | return PyLong_FromVoidPtr(*(void **)p); |
| 536 | } |
| 537 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 538 | static int |
| 539 | np_byte(p, v, f) |
| 540 | char *p; |
| 541 | PyObject *v; |
| 542 | const formatdef *f; |
| 543 | { |
| 544 | long x; |
| 545 | if (get_long(v, &x) < 0) |
| 546 | return -1; |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 547 | *p = (char)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | static int |
| 552 | np_char(p, v, f) |
| 553 | char *p; |
| 554 | PyObject *v; |
| 555 | const formatdef *f; |
| 556 | { |
| 557 | if (!PyString_Check(v) || PyString_Size(v) != 1) { |
| 558 | PyErr_SetString(StructError, |
| 559 | "char format require string of length 1"); |
| 560 | return -1; |
| 561 | } |
| 562 | *p = *PyString_AsString(v); |
| 563 | return 0; |
| 564 | } |
| 565 | |
| 566 | static int |
| 567 | np_short(p, v, f) |
| 568 | char *p; |
| 569 | PyObject *v; |
| 570 | const formatdef *f; |
| 571 | { |
| 572 | long x; |
| 573 | if (get_long(v, &x) < 0) |
| 574 | return -1; |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 575 | * (short *)p = (short)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | static int |
| 580 | np_int(p, v, f) |
| 581 | char *p; |
| 582 | PyObject *v; |
| 583 | const formatdef *f; |
| 584 | { |
| 585 | long x; |
| 586 | if (get_long(v, &x) < 0) |
| 587 | return -1; |
| 588 | * (int *)p = x; |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | static int |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 593 | np_uint(p, v, f) |
| 594 | char *p; |
| 595 | PyObject *v; |
| 596 | const formatdef *f; |
| 597 | { |
| 598 | unsigned long x; |
| 599 | if (get_ulong(v, &x) < 0) |
| 600 | return -1; |
| 601 | * (unsigned int *)p = x; |
| 602 | return 0; |
| 603 | } |
| 604 | |
| 605 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 606 | np_long(p, v, f) |
| 607 | char *p; |
| 608 | PyObject *v; |
| 609 | const formatdef *f; |
| 610 | { |
| 611 | long x; |
| 612 | if (get_long(v, &x) < 0) |
| 613 | return -1; |
| 614 | * (long *)p = x; |
| 615 | return 0; |
| 616 | } |
| 617 | |
| 618 | static int |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 619 | np_ulong(p, v, f) |
| 620 | char *p; |
| 621 | PyObject *v; |
| 622 | const formatdef *f; |
| 623 | { |
| 624 | unsigned long x; |
| 625 | if (get_ulong(v, &x) < 0) |
| 626 | return -1; |
| 627 | * (unsigned long *)p = x; |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 632 | np_float(p, v, f) |
| 633 | char *p; |
| 634 | PyObject *v; |
| 635 | const formatdef *f; |
| 636 | { |
| 637 | float x = (float)PyFloat_AsDouble(v); |
| 638 | if (x == -1 && PyErr_Occurred()) { |
| 639 | PyErr_SetString(StructError, |
| 640 | "required argument is not a float"); |
| 641 | return -1; |
| 642 | } |
| 643 | memcpy(p, (char *)&x, sizeof(float)); |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | static int |
| 648 | np_double(p, v, f) |
| 649 | char *p; |
| 650 | PyObject *v; |
| 651 | const formatdef *f; |
| 652 | { |
| 653 | double x = PyFloat_AsDouble(v); |
| 654 | if (x == -1 && PyErr_Occurred()) { |
| 655 | PyErr_SetString(StructError, |
| 656 | "required argument is not a float"); |
| 657 | return -1; |
| 658 | } |
| 659 | memcpy(p, (char *)&x, sizeof(double)); |
| 660 | return 0; |
| 661 | } |
| 662 | |
Guido van Rossum | 78694d9 | 1998-09-18 14:14:13 +0000 | [diff] [blame] | 663 | static int |
| 664 | np_void_p(p, v, f) |
| 665 | char *p; |
| 666 | PyObject *v; |
| 667 | const formatdef *f; |
| 668 | { |
| 669 | void *x = PyLong_AsVoidPtr(v); |
| 670 | if (x == NULL && PyErr_Occurred()) { |
| 671 | /* ### hrm. PyLong_AsVoidPtr raises SystemError */ |
| 672 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
| 673 | PyErr_SetString(StructError, |
| 674 | "required argument is not an integer"); |
| 675 | return -1; |
| 676 | } |
| 677 | *(void **)p = x; |
| 678 | return 0; |
| 679 | } |
| 680 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 681 | static formatdef native_table[] = { |
| 682 | {'x', sizeof(char), 0, NULL}, |
| 683 | {'b', sizeof(char), 0, nu_byte, np_byte}, |
| 684 | {'B', sizeof(char), 0, nu_ubyte, np_byte}, |
| 685 | {'c', sizeof(char), 0, nu_char, np_char}, |
| 686 | {'s', sizeof(char), 0, NULL}, |
Guido van Rossum | 9eb671f | 1997-09-05 07:08:39 +0000 | [diff] [blame] | 687 | {'p', sizeof(char), 0, NULL}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 688 | {'h', sizeof(short), SHORT_ALIGN, nu_short, np_short}, |
| 689 | {'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_short}, |
| 690 | {'i', sizeof(int), INT_ALIGN, nu_int, np_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 691 | {'I', sizeof(int), INT_ALIGN, nu_uint, np_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 692 | {'l', sizeof(long), LONG_ALIGN, nu_long, np_long}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 693 | {'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 694 | {'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float}, |
| 695 | {'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double}, |
Guido van Rossum | 78694d9 | 1998-09-18 14:14:13 +0000 | [diff] [blame] | 696 | {'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 697 | {0} |
| 698 | }; |
| 699 | |
| 700 | static PyObject * |
| 701 | bu_int(p, f) |
| 702 | const char *p; |
| 703 | const formatdef *f; |
| 704 | { |
| 705 | long x = 0; |
| 706 | int i = f->size; |
| 707 | do { |
| 708 | x = (x<<8) | (*p++ & 0xFF); |
| 709 | } while (--i > 0); |
| 710 | i = 8*(sizeof(long) - f->size); |
| 711 | if (i) { |
| 712 | x <<= i; |
| 713 | x >>= i; |
| 714 | } |
| 715 | return PyInt_FromLong(x); |
| 716 | } |
| 717 | |
| 718 | static PyObject * |
| 719 | bu_uint(p, f) |
| 720 | const char *p; |
| 721 | const formatdef *f; |
| 722 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 723 | unsigned long x = 0; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 724 | int i = f->size; |
| 725 | do { |
| 726 | x = (x<<8) | (*p++ & 0xFF); |
| 727 | } while (--i > 0); |
Guido van Rossum | 39ef227 | 1998-06-29 04:00:40 +0000 | [diff] [blame] | 728 | if (f->size >= 4) |
| 729 | return PyLong_FromUnsignedLong(x); |
| 730 | else |
| 731 | return PyInt_FromLong((long)x); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 732 | } |
| 733 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 734 | static PyObject * |
| 735 | bu_float(p, f) |
| 736 | const char *p; |
| 737 | const formatdef *f; |
| 738 | { |
| 739 | return unpack_float(p, 1); |
| 740 | } |
| 741 | |
| 742 | static PyObject * |
| 743 | bu_double(p, f) |
| 744 | const char *p; |
| 745 | const formatdef *f; |
| 746 | { |
| 747 | return unpack_double(p, 1); |
| 748 | } |
| 749 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 750 | static int |
| 751 | bp_int(p, v, f) |
| 752 | char *p; |
| 753 | PyObject *v; |
| 754 | const formatdef *f; |
| 755 | { |
| 756 | long x; |
| 757 | int i; |
| 758 | if (get_long(v, &x) < 0) |
| 759 | return -1; |
| 760 | i = f->size; |
| 761 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 762 | p[--i] = (char)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 763 | x >>= 8; |
| 764 | } while (i > 0); |
| 765 | return 0; |
| 766 | } |
| 767 | |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 768 | static int |
| 769 | bp_uint(p, v, f) |
| 770 | char *p; |
| 771 | PyObject *v; |
| 772 | const formatdef *f; |
| 773 | { |
| 774 | unsigned long x; |
| 775 | int i; |
| 776 | if (get_ulong(v, &x) < 0) |
| 777 | return -1; |
| 778 | i = f->size; |
| 779 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 780 | p[--i] = (char)x; |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 781 | x >>= 8; |
| 782 | } while (i > 0); |
| 783 | return 0; |
| 784 | } |
| 785 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 786 | static int |
| 787 | bp_float(p, v, f) |
| 788 | char *p; |
| 789 | PyObject *v; |
| 790 | const formatdef *f; |
| 791 | { |
| 792 | double x = PyFloat_AsDouble(v); |
| 793 | if (x == -1 && PyErr_Occurred()) { |
| 794 | PyErr_SetString(StructError, |
| 795 | "required argument is not a float"); |
| 796 | return -1; |
| 797 | } |
| 798 | return pack_float(x, p, 1); |
| 799 | } |
| 800 | |
| 801 | static int |
| 802 | bp_double(p, v, f) |
| 803 | char *p; |
| 804 | PyObject *v; |
| 805 | const formatdef *f; |
| 806 | { |
| 807 | double x = PyFloat_AsDouble(v); |
| 808 | if (x == -1 && PyErr_Occurred()) { |
| 809 | PyErr_SetString(StructError, |
| 810 | "required argument is not a float"); |
| 811 | return -1; |
| 812 | } |
| 813 | return pack_double(x, p, 1); |
| 814 | } |
| 815 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 816 | static formatdef bigendian_table[] = { |
| 817 | {'x', 1, 0, NULL}, |
| 818 | {'b', 1, 0, bu_int, bp_int}, |
| 819 | {'B', 1, 0, bu_uint, bp_int}, |
| 820 | {'c', 1, 0, nu_char, np_char}, |
| 821 | {'s', 1, 0, NULL}, |
Guido van Rossum | 9eb671f | 1997-09-05 07:08:39 +0000 | [diff] [blame] | 822 | {'p', 1, 0, NULL}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 823 | {'h', 2, 0, bu_int, bp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 824 | {'H', 2, 0, bu_uint, bp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 825 | {'i', 4, 0, bu_int, bp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 826 | {'I', 4, 0, bu_uint, bp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 827 | {'l', 4, 0, bu_int, bp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 828 | {'L', 4, 0, bu_uint, bp_uint}, |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 829 | {'f', 4, 0, bu_float, bp_float}, |
| 830 | {'d', 8, 0, bu_double, bp_double}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 831 | {0} |
| 832 | }; |
| 833 | |
| 834 | static PyObject * |
| 835 | lu_int(p, f) |
| 836 | const char *p; |
| 837 | const formatdef *f; |
| 838 | { |
| 839 | long x = 0; |
| 840 | int i = f->size; |
| 841 | do { |
| 842 | x = (x<<8) | (p[--i] & 0xFF); |
| 843 | } while (i > 0); |
| 844 | i = 8*(sizeof(long) - f->size); |
| 845 | if (i) { |
| 846 | x <<= i; |
| 847 | x >>= i; |
| 848 | } |
| 849 | return PyInt_FromLong(x); |
| 850 | } |
| 851 | |
| 852 | static PyObject * |
| 853 | lu_uint(p, f) |
| 854 | const char *p; |
| 855 | const formatdef *f; |
| 856 | { |
Guido van Rossum | 6c87eca | 1997-01-03 19:08:16 +0000 | [diff] [blame] | 857 | unsigned long x = 0; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 858 | int i = f->size; |
| 859 | do { |
| 860 | x = (x<<8) | (p[--i] & 0xFF); |
| 861 | } while (i > 0); |
Guido van Rossum | 39ef227 | 1998-06-29 04:00:40 +0000 | [diff] [blame] | 862 | if (f->size >= 4) |
| 863 | return PyLong_FromUnsignedLong(x); |
| 864 | else |
| 865 | return PyInt_FromLong((long)x); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 866 | } |
| 867 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 868 | static PyObject * |
| 869 | lu_float(p, f) |
| 870 | const char *p; |
| 871 | const formatdef *f; |
| 872 | { |
| 873 | return unpack_float(p+3, -1); |
| 874 | } |
| 875 | |
| 876 | static PyObject * |
| 877 | lu_double(p, f) |
| 878 | const char *p; |
| 879 | const formatdef *f; |
| 880 | { |
| 881 | return unpack_double(p+7, -1); |
| 882 | } |
| 883 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 884 | static int |
| 885 | lp_int(p, v, f) |
| 886 | char *p; |
| 887 | PyObject *v; |
| 888 | const formatdef *f; |
| 889 | { |
| 890 | long x; |
| 891 | int i; |
| 892 | if (get_long(v, &x) < 0) |
| 893 | return -1; |
| 894 | i = f->size; |
| 895 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 896 | *p++ = (char)x; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 897 | x >>= 8; |
| 898 | } while (--i > 0); |
| 899 | return 0; |
| 900 | } |
| 901 | |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 902 | static int |
| 903 | lp_uint(p, v, f) |
| 904 | char *p; |
| 905 | PyObject *v; |
| 906 | const formatdef *f; |
| 907 | { |
| 908 | unsigned long x; |
| 909 | int i; |
| 910 | if (get_ulong(v, &x) < 0) |
| 911 | return -1; |
| 912 | i = f->size; |
| 913 | do { |
Guido van Rossum | 7844e38 | 1997-04-11 20:44:04 +0000 | [diff] [blame] | 914 | *p++ = (char)x; |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 915 | x >>= 8; |
| 916 | } while (--i > 0); |
| 917 | return 0; |
| 918 | } |
| 919 | |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 920 | static int |
| 921 | lp_float(p, v, f) |
| 922 | char *p; |
| 923 | PyObject *v; |
| 924 | const formatdef *f; |
| 925 | { |
| 926 | double x = PyFloat_AsDouble(v); |
| 927 | if (x == -1 && PyErr_Occurred()) { |
| 928 | PyErr_SetString(StructError, |
| 929 | "required argument is not a float"); |
| 930 | return -1; |
| 931 | } |
| 932 | return pack_float(x, p+3, -1); |
| 933 | } |
| 934 | |
| 935 | static int |
| 936 | lp_double(p, v, f) |
| 937 | char *p; |
| 938 | PyObject *v; |
| 939 | const formatdef *f; |
| 940 | { |
| 941 | double x = PyFloat_AsDouble(v); |
| 942 | if (x == -1 && PyErr_Occurred()) { |
| 943 | PyErr_SetString(StructError, |
| 944 | "required argument is not a float"); |
| 945 | return -1; |
| 946 | } |
| 947 | return pack_double(x, p+7, -1); |
| 948 | } |
| 949 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 950 | static formatdef lilendian_table[] = { |
| 951 | {'x', 1, 0, NULL}, |
| 952 | {'b', 1, 0, lu_int, lp_int}, |
| 953 | {'B', 1, 0, lu_uint, lp_int}, |
| 954 | {'c', 1, 0, nu_char, np_char}, |
| 955 | {'s', 1, 0, NULL}, |
Guido van Rossum | 9eb671f | 1997-09-05 07:08:39 +0000 | [diff] [blame] | 956 | {'p', 1, 0, NULL}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 957 | {'h', 2, 0, lu_int, lp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 958 | {'H', 2, 0, lu_uint, lp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 959 | {'i', 4, 0, lu_int, lp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 960 | {'I', 4, 0, lu_uint, lp_uint}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 961 | {'l', 4, 0, lu_int, lp_int}, |
Guido van Rossum | 60c5061 | 1996-12-31 16:29:52 +0000 | [diff] [blame] | 962 | {'L', 4, 0, lu_uint, lp_uint}, |
Guido van Rossum | 74679b4 | 1997-01-02 22:21:36 +0000 | [diff] [blame] | 963 | {'f', 4, 0, lu_float, lp_float}, |
| 964 | {'d', 8, 0, lu_double, lp_double}, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 965 | {0} |
| 966 | }; |
| 967 | |
| 968 | |
| 969 | static const formatdef * |
| 970 | whichtable(pfmt) |
| 971 | const char **pfmt; |
| 972 | { |
| 973 | const char *fmt = (*pfmt)++; /* May be backed out of later */ |
| 974 | switch (*fmt) { |
| 975 | case '<': |
| 976 | return lilendian_table; |
| 977 | case '>': |
| 978 | case '!': /* Network byte order is big-endian */ |
| 979 | return bigendian_table; |
| 980 | case '=': { /* Host byte order -- different from native in aligment! */ |
| 981 | int n = 1; |
| 982 | char *p = (char *) &n; |
| 983 | if (*p == 1) |
| 984 | return lilendian_table; |
| 985 | else |
| 986 | return bigendian_table; |
| 987 | } |
| 988 | default: |
| 989 | --*pfmt; /* Back out of pointer increment */ |
| 990 | /* Fall through */ |
| 991 | case '@': |
| 992 | return native_table; |
| 993 | } |
| 994 | } |
| 995 | |
| 996 | |
| 997 | /* Get the table entry for a format code */ |
| 998 | |
| 999 | static const formatdef * |
| 1000 | getentry(c, f) |
| 1001 | int c; |
| 1002 | const formatdef *f; |
| 1003 | { |
| 1004 | for (; f->format != '\0'; f++) { |
| 1005 | if (f->format == c) { |
| 1006 | return f; |
| 1007 | } |
| 1008 | } |
| 1009 | PyErr_SetString(StructError, "bad char in struct format"); |
| 1010 | return NULL; |
| 1011 | } |
| 1012 | |
| 1013 | |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1014 | /* Align a size according to a format code */ |
| 1015 | |
| 1016 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1017 | align(size, c, e) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1018 | int size; |
| 1019 | int c; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1020 | const formatdef *e; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1021 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1022 | if (e->format == c) { |
| 1023 | if (e->alignment) { |
| 1024 | size = ((size + e->alignment - 1) |
| 1025 | / e->alignment) |
| 1026 | * e->alignment; |
| 1027 | } |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1028 | } |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1029 | return size; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1030 | } |
| 1031 | |
| 1032 | |
| 1033 | /* calculate the size of a format string */ |
| 1034 | |
| 1035 | static int |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1036 | calcsize(fmt, f) |
| 1037 | const char *fmt; |
| 1038 | const formatdef *f; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1039 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1040 | const formatdef *e; |
| 1041 | const char *s; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1042 | char c; |
| 1043 | int size, num, itemsize, x; |
| 1044 | |
| 1045 | s = fmt; |
| 1046 | size = 0; |
| 1047 | while ((c = *s++) != '\0') { |
Guido van Rossum | 730806d | 1998-04-10 22:27:42 +0000 | [diff] [blame] | 1048 | if (isspace((int)c)) |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame] | 1049 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1050 | if ('0' <= c && c <= '9') { |
| 1051 | num = c - '0'; |
| 1052 | while ('0' <= (c = *s++) && c <= '9') { |
| 1053 | x = num*10 + (c - '0'); |
| 1054 | if (x/10 != num) { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1055 | PyErr_SetString( |
| 1056 | StructError, |
| 1057 | "overflow in item count"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1058 | return -1; |
| 1059 | } |
| 1060 | num = x; |
| 1061 | } |
| 1062 | if (c == '\0') |
| 1063 | break; |
| 1064 | } |
| 1065 | else |
| 1066 | num = 1; |
| 1067 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1068 | e = getentry(c, f); |
| 1069 | if (e == NULL) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1070 | return -1; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1071 | itemsize = e->size; |
| 1072 | size = align(size, c, e); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1073 | x = num * itemsize; |
| 1074 | size += x; |
| 1075 | if (x/itemsize != num || size < 0) { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1076 | PyErr_SetString(StructError, |
| 1077 | "total struct size too long"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1078 | return -1; |
| 1079 | } |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | return size; |
| 1083 | } |
| 1084 | |
| 1085 | |
Guido van Rossum | 414fd48 | 1997-12-19 04:24:24 +0000 | [diff] [blame] | 1086 | static char calcsize__doc__[] = "\ |
| 1087 | calcsize(fmt) -> int\n\ |
| 1088 | Return size of C struct described by format string fmt.\n\ |
| 1089 | See struct.__doc__ for more on format strings."; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1090 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1091 | static PyObject * |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1092 | struct_calcsize(self, args) |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1093 | PyObject *self; /* Not used */ |
| 1094 | PyObject *args; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1095 | { |
| 1096 | char *fmt; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1097 | const formatdef *f; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1098 | int size; |
| 1099 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1100 | if (!PyArg_ParseTuple(args, "s", &fmt)) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1101 | return NULL; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1102 | f = whichtable(&fmt); |
| 1103 | size = calcsize(fmt, f); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1104 | if (size < 0) |
| 1105 | return NULL; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1106 | return PyInt_FromLong((long)size); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | |
Guido van Rossum | 414fd48 | 1997-12-19 04:24:24 +0000 | [diff] [blame] | 1110 | static char pack__doc__[] = "\ |
| 1111 | pack(fmt, v1, v2, ...) -> string\n\ |
| 1112 | Return string containing values v1, v2, ... packed according to fmt.\n\ |
| 1113 | See struct.__doc__ for more on format strings."; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1114 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1115 | static PyObject * |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1116 | struct_pack(self, args) |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1117 | PyObject *self; /* Not used */ |
| 1118 | PyObject *args; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1119 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1120 | const formatdef *f, *e; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1121 | PyObject *format, *result, *v; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1122 | char *fmt; |
| 1123 | int size, num; |
| 1124 | int i, n; |
Guido van Rossum | b9d338c | 1997-01-03 15:40:33 +0000 | [diff] [blame] | 1125 | char *s, *res, *restart, *nres; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1126 | char c; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1127 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1128 | if (args == NULL || !PyTuple_Check(args) || |
| 1129 | (n = PyTuple_Size(args)) < 1) |
| 1130 | { |
| 1131 | PyErr_BadArgument(); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1132 | return NULL; |
| 1133 | } |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1134 | format = PyTuple_GetItem(args, 0); |
| 1135 | if (!PyArg_Parse(format, "s", &fmt)) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1136 | return NULL; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1137 | f = whichtable(&fmt); |
| 1138 | size = calcsize(fmt, f); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1139 | if (size < 0) |
| 1140 | return NULL; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1141 | result = PyString_FromStringAndSize((char *)NULL, size); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1142 | if (result == NULL) |
| 1143 | return NULL; |
| 1144 | |
| 1145 | s = fmt; |
| 1146 | i = 1; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1147 | res = restart = PyString_AsString(result); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1148 | |
| 1149 | while ((c = *s++) != '\0') { |
Guido van Rossum | 730806d | 1998-04-10 22:27:42 +0000 | [diff] [blame] | 1150 | if (isspace((int)c)) |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame] | 1151 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1152 | if ('0' <= c && c <= '9') { |
| 1153 | num = c - '0'; |
| 1154 | while ('0' <= (c = *s++) && c <= '9') |
| 1155 | num = num*10 + (c - '0'); |
| 1156 | if (c == '\0') |
| 1157 | break; |
| 1158 | } |
| 1159 | else |
| 1160 | num = 1; |
| 1161 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1162 | e = getentry(c, f); |
| 1163 | if (e == NULL) |
| 1164 | goto fail; |
Guido van Rossum | b9d338c | 1997-01-03 15:40:33 +0000 | [diff] [blame] | 1165 | nres = restart + align((int)(res-restart), c, e); |
| 1166 | /* Fill padd bytes with zeros */ |
| 1167 | while (res < nres) |
| 1168 | *res++ = '\0'; |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1169 | if (num == 0 && c != 's') |
| 1170 | continue; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1171 | do { |
| 1172 | if (c == 'x') { |
| 1173 | /* doesn't consume arguments */ |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1174 | memset(res, '\0', num); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1175 | res += num; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1176 | break; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1177 | } |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1178 | if (i >= n) { |
| 1179 | PyErr_SetString(StructError, |
| 1180 | "insufficient arguments to pack"); |
| 1181 | goto fail; |
| 1182 | } |
| 1183 | v = PyTuple_GetItem(args, i++); |
| 1184 | if (v == NULL) |
| 1185 | goto fail; |
| 1186 | if (c == 's') { |
| 1187 | /* num is string size, not repeat count */ |
| 1188 | int n; |
| 1189 | if (!PyString_Check(v)) { |
| 1190 | PyErr_SetString(StructError, |
| 1191 | "argument for 's' must be a string"); |
| 1192 | goto fail; |
| 1193 | } |
| 1194 | n = PyString_Size(v); |
| 1195 | if (n > num) |
| 1196 | n = num; |
| 1197 | if (n > 0) |
| 1198 | memcpy(res, PyString_AsString(v), n); |
| 1199 | if (n < num) |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1200 | memset(res+n, '\0', num-n); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1201 | res += num; |
| 1202 | break; |
| 1203 | } |
Guido van Rossum | 9eb671f | 1997-09-05 07:08:39 +0000 | [diff] [blame] | 1204 | else if (c == 'p') { |
| 1205 | /* num is string size + 1, |
| 1206 | to fit in the count byte */ |
| 1207 | int n; |
| 1208 | num--; /* now num is max string size */ |
| 1209 | if (!PyString_Check(v)) { |
| 1210 | PyErr_SetString(StructError, |
| 1211 | "argument for 'p' must be a string"); |
| 1212 | goto fail; |
| 1213 | } |
| 1214 | n = PyString_Size(v); |
| 1215 | if (n > num) |
| 1216 | n = num; |
| 1217 | if (n > 0) |
| 1218 | memcpy(res+1, PyString_AsString(v), n); |
| 1219 | if (n < num) |
| 1220 | /* no real need, just to be nice */ |
| 1221 | memset(res+1+n, '\0', num-n); |
| 1222 | *res++ = n; /* store the length byte */ |
| 1223 | res += num; |
| 1224 | break; |
| 1225 | } |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1226 | else { |
| 1227 | if (e->pack(res, v, e) < 0) |
| 1228 | goto fail; |
| 1229 | res += e->size; |
| 1230 | } |
| 1231 | } while (--num > 0); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1232 | } |
| 1233 | |
| 1234 | if (i < n) { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1235 | PyErr_SetString(StructError, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1236 | "too many arguments for pack format"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1237 | goto fail; |
| 1238 | } |
| 1239 | |
| 1240 | return result; |
| 1241 | |
| 1242 | fail: |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1243 | Py_DECREF(result); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1244 | return NULL; |
| 1245 | } |
| 1246 | |
| 1247 | |
Guido van Rossum | 9897f0f | 1997-12-21 06:46:20 +0000 | [diff] [blame] | 1248 | static char unpack__doc__[] = "\ |
| 1249 | unpack(fmt, string) -> (v1, v2, ...)\n\ |
| 1250 | Unpack the string, containing packed C structure data, according\n\ |
| 1251 | to fmt. Requires len(string)==calcsize(fmt).\n\ |
Guido van Rossum | 414fd48 | 1997-12-19 04:24:24 +0000 | [diff] [blame] | 1252 | See struct.__doc__ for more on format strings."; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1253 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1254 | static PyObject * |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1255 | struct_unpack(self, args) |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1256 | PyObject *self; /* Not used */ |
| 1257 | PyObject *args; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1258 | { |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1259 | const formatdef *f, *e; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1260 | char *str, *start, *fmt, *s; |
| 1261 | char c; |
Barry Warsaw | b9a781e | 1997-01-03 00:26:28 +0000 | [diff] [blame] | 1262 | int len, size, num; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1263 | PyObject *res, *v; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1264 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1265 | if (!PyArg_ParseTuple(args, "ss#", &fmt, &start, &len)) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1266 | return NULL; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1267 | f = whichtable(&fmt); |
| 1268 | size = calcsize(fmt, f); |
| 1269 | if (size < 0) |
| 1270 | return NULL; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1271 | if (size != len) { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1272 | PyErr_SetString(StructError, |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1273 | "unpack str size does not match format"); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1274 | return NULL; |
| 1275 | } |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1276 | res = PyList_New(0); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1277 | if (res == NULL) |
| 1278 | return NULL; |
| 1279 | str = start; |
| 1280 | s = fmt; |
| 1281 | while ((c = *s++) != '\0') { |
Guido van Rossum | 730806d | 1998-04-10 22:27:42 +0000 | [diff] [blame] | 1282 | if (isspace((int)c)) |
Guido van Rossum | e20aef5 | 1997-08-26 20:39:54 +0000 | [diff] [blame] | 1283 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1284 | if ('0' <= c && c <= '9') { |
| 1285 | num = c - '0'; |
| 1286 | while ('0' <= (c = *s++) && c <= '9') |
| 1287 | num = num*10 + (c - '0'); |
| 1288 | if (c == '\0') |
| 1289 | break; |
| 1290 | } |
| 1291 | else |
| 1292 | num = 1; |
| 1293 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1294 | e = getentry(c, f); |
| 1295 | if (e == NULL) |
| 1296 | goto fail; |
| 1297 | str = start + align((int)(str-start), c, e); |
Guido van Rossum | 3aa27fd | 1996-12-31 02:10:45 +0000 | [diff] [blame] | 1298 | if (num == 0 && c != 's') |
| 1299 | continue; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1300 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1301 | do { |
| 1302 | if (c == 'x') { |
| 1303 | str += num; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1304 | break; |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1305 | } |
| 1306 | if (c == 's') { |
| 1307 | /* num is string size, not repeat count */ |
| 1308 | v = PyString_FromStringAndSize(str, num); |
| 1309 | if (v == NULL) |
| 1310 | goto fail; |
| 1311 | str += num; |
| 1312 | num = 0; |
| 1313 | } |
Guido van Rossum | 9eb671f | 1997-09-05 07:08:39 +0000 | [diff] [blame] | 1314 | else if (c == 'p') { |
| 1315 | /* num is string buffer size, |
| 1316 | not repeat count */ |
| 1317 | int n = *(unsigned char*)str; |
| 1318 | /* first byte (unsigned) is string size */ |
| 1319 | if (n >= num) |
| 1320 | n = num-1; |
| 1321 | v = PyString_FromStringAndSize(str+1, n); |
| 1322 | if (v == NULL) |
| 1323 | goto fail; |
| 1324 | str += num; |
| 1325 | num = 0; |
| 1326 | } |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1327 | else { |
| 1328 | v = e->unpack(str, e); |
| 1329 | if (v == NULL) |
| 1330 | goto fail; |
| 1331 | str += e->size; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1332 | } |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1333 | if (v == NULL || PyList_Append(res, v) < 0) |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1334 | goto fail; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1335 | Py_DECREF(v); |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1336 | } while (--num > 0); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1337 | } |
| 1338 | |
Guido van Rossum | f7e6b4b | 1996-12-31 01:41:25 +0000 | [diff] [blame] | 1339 | v = PyList_AsTuple(res); |
| 1340 | Py_DECREF(res); |
| 1341 | return v; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1342 | |
| 1343 | fail: |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1344 | Py_DECREF(res); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1345 | return NULL; |
| 1346 | } |
| 1347 | |
Guido van Rossum | 90ddb7b | 1992-08-19 16:44:15 +0000 | [diff] [blame] | 1348 | |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1349 | /* List of functions */ |
| 1350 | |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1351 | static PyMethodDef struct_methods[] = { |
Guido van Rossum | 414fd48 | 1997-12-19 04:24:24 +0000 | [diff] [blame] | 1352 | {"calcsize", struct_calcsize, METH_VARARGS, calcsize__doc__}, |
| 1353 | {"pack", struct_pack, METH_VARARGS, pack__doc__}, |
| 1354 | {"unpack", struct_unpack, METH_VARARGS, unpack__doc__}, |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1355 | {NULL, NULL} /* sentinel */ |
| 1356 | }; |
| 1357 | |
| 1358 | |
| 1359 | /* Module initialization */ |
| 1360 | |
| 1361 | void |
| 1362 | initstruct() |
| 1363 | { |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1364 | PyObject *m, *d; |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1365 | |
| 1366 | /* Create the module and add the functions */ |
Guido van Rossum | 414fd48 | 1997-12-19 04:24:24 +0000 | [diff] [blame] | 1367 | m = Py_InitModule4("struct", struct_methods, struct__doc__, |
| 1368 | (PyObject*)NULL, PYTHON_API_VERSION); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1369 | |
| 1370 | /* Add some symbolic constants to the module */ |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1371 | d = PyModule_GetDict(m); |
Guido van Rossum | 0cb96de | 1997-10-01 04:29:29 +0000 | [diff] [blame] | 1372 | StructError = PyErr_NewException("struct.error", NULL, NULL); |
| 1373 | if (StructError == NULL) |
| 1374 | return; |
Barry Warsaw | 30695fa | 1996-12-12 23:32:31 +0000 | [diff] [blame] | 1375 | PyDict_SetItemString(d, "error", StructError); |
Guido van Rossum | 0297512 | 1992-08-17 08:55:12 +0000 | [diff] [blame] | 1376 | } |