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/cvs/Compress-LZF/LZF.xs
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Comparing Compress-LZF/LZF.xs (file contents):
Revision 1.21 by root, Wed Sep 27 15:52:47 2006 UTC vs.
Revision 1.31 by root, Sun Aug 25 18:13:26 2013 UTC

1#include "EXTERN.h" 1#include "EXTERN.h"
2#include "perl.h" 2#include "perl.h"
3#include "XSUB.h" 3#include "XSUB.h"
4 4
5/* try to be compatible with older perls */ 5#define LZF_STANDALONE 1
6/* SvPV_nolen() macro first defined in 5.005_55 */ 6#define LZF_STATE_ARG 1
7/* this is slow, not threadsafe, but works */
8#include "patchlevel.h"
9#if (PATCHLEVEL == 4) || ((PATCHLEVEL == 5) && (SUBVERSION < 55))
10static STRLEN nolen_na;
11# define SvPV_nolen(sv) SvPV ((sv), nolen_na)
12#endif
13#if PATCHLEVEL < 6
14# define call_sv perl_call_sv
15#endif
16 7
17#include "lzf_c.c" 8#include "lzf_c.c"
18#include "lzf_d.c" 9#include "lzf_d.c"
10#include "lzf_c_best.c"
19 11
20/* we re-use the storable header for our purposes */ 12/* we re-use the storable header for our purposes */
21#define MAGIC_LO 0 13#define MAGIC_LO 0
22#define MAGIC_U 0 /* uncompressed data follows */ 14#define MAGIC_U 0 /* uncompressed data follows */
23#define MAGIC_C 1 /* compressed data follows */ 15#define MAGIC_C 1 /* compressed data follows */
… …
39#else 31#else
40# define MAX_LENGTH ((Size_t) 0x8000000L) 32# define MAX_LENGTH ((Size_t) 0x8000000L)
41#endif 33#endif
42 34
43static SV * 35static SV *
44compress_sv (SV *data, char cprepend, int uprepend) 36compress_sv (SV *data, char cprepend, int uprepend, int best)
45{ 37{
38 LZF_STATE *state;
46 STRLEN usize, csize; 39 STRLEN usize, csize;
47 char *src = (char *)SvPV (data, usize); 40 char *src = (char *)SvPVbyte (data, usize);
48 41
49 if (usize) 42 if (usize)
50 { 43 {
51 SV *ret = NEWSV (0, usize + 1); 44 SV *ret = NEWSV (0, usize + 1);
52 unsigned char *dst; 45 unsigned char *dst;
… …
60 53
61 if (usize <= 0x7f) 54 if (usize <= 0x7f)
62 { 55 {
63 dst[skip++] = usize; 56 dst[skip++] = usize;
64 } 57 }
65 else if (usize <= 0x7ff) 58 else if (usize <= 0x7ff)
66 { 59 {
67 dst[skip++] = (( usize >> 6) | 0xc0); 60 dst[skip++] = (( usize >> 6) | 0xc0);
68 dst[skip++] = (( usize & 0x3f) | 0x80); 61 dst[skip++] = (( usize & 0x3f) | 0x80);
69 } 62 }
70 else if (usize <= 0xffff) 63 else if (usize <= 0xffff)
… …
98 dst[skip++] = (( usize & 0x3f) | 0x80); 91 dst[skip++] = (( usize & 0x3f) | 0x80);
99 } 92 }
100 else 93 else
101 croak ("compress can only compress up to %ld bytes", 0x7fffffffL); 94 croak ("compress can only compress up to %ld bytes", 0x7fffffffL);
102 95
96 New (0, state, 1, LZF_STATE);
97 if (!state)
98 croak ("Compress::LZF unable to allocate memory for compression state");
99
103 /* 11 bytes is the smallest compressible string */ 100 /* 11 bytes is the smallest compressible string */
104 csize = usize < 11 ? 0 : 101 csize = usize < 11 ? 0 :
105 lzf_compress (src, usize, 102 (best ? lzf_compress_best (src, usize, dst + skip, usize - skip)
106 dst + skip, 103 : lzf_compress (src, usize, dst + skip, usize - skip, *state));
107 usize - skip); 104
105 Safefree (state);
108 106
109 if (csize) 107 if (csize)
110 { 108 {
111 SvCUR_set (ret, csize + skip); 109 SvCUR_set (ret, csize + skip);
112 } 110 }
… …
132 130
133static SV * 131static SV *
134decompress_sv (SV *data, int skip) 132decompress_sv (SV *data, int skip)
135{ 133{
136 STRLEN usize, csize; 134 STRLEN usize, csize;
137 unsigned char *src = (unsigned char *)SvPV (data, csize) + skip; 135 unsigned char *src = (unsigned char *)SvPVbyte (data, csize) + skip;
138 136
139 if (csize) 137 if (csize)
140 { 138 {
141 void *dst; 139 void *dst;
142 SV *ret; 140 SV *ret;
… …
199 ret = NEWSV (0, usize); 197 ret = NEWSV (0, usize);
200 SvPOK_only (ret); 198 SvPOK_only (ret);
201 dst = SvPVX (ret); 199 dst = SvPVX (ret);
202 200
203 if (lzf_decompress (src, csize, dst, usize) != usize) 201 if (lzf_decompress (src, csize, dst, usize) != usize)
202 {
203 SvREFCNT_dec (ret);
204 croak ("compressed data corrupted (size mismatch)", csize, skip, usize); 204 croak ("compressed data corrupted (size mismatch)", csize, skip, usize);
205 }
205 } 206 }
206 else 207 else
207 { 208 {
208 usize = csize - 1; 209 usize = csize - 1;
209 ret = NEWSV (0, usize | 1); 210 ret = NEWSV (0, usize | 1);
… …
219 else 220 else
220 return newSVpvn ("", 0); 221 return newSVpvn ("", 0);
221} 222}
222 223
223static void 224static void
224need_storable(void) 225need_storable (void)
225{ 226{
226#if PATCHLEVEL < 6 227 eval_sv (sv_2mortal (newSVpvf ("require %s", SvPVbyte_nolen (serializer_package))), G_VOID | G_DISCARD);
227 char req[8192];
228 sprintf (req, "require %s;", SvPV_nolen (serializer_package));
229 perl_eval_pv (req, 1);
230#else
231 load_module (PERL_LOADMOD_NOIMPORT, serializer_package, Nullsv);
232#endif
233 228
234 storable_mstore = GvCV (gv_fetchpv (SvPV_nolen (serializer_mstore ), TRUE, SVt_PVCV)); 229 storable_mstore = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mstore ), TRUE, SVt_PVCV)));
235 storable_mretrieve = GvCV (gv_fetchpv (SvPV_nolen (serializer_mretrieve), TRUE, SVt_PVCV)); 230 storable_mretrieve = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mretrieve), TRUE, SVt_PVCV)));
236} 231}
237 232
238MODULE = Compress::LZF PACKAGE = Compress::LZF 233MODULE = Compress::LZF PACKAGE = Compress::LZF
239 234
240BOOT: 235BOOT:
… …
250 PROTOTYPE: $$$ 245 PROTOTYPE: $$$
251 PPCODE: 246 PPCODE:
252 SvSetSV (serializer_package , package ); 247 SvSetSV (serializer_package , package );
253 SvSetSV (serializer_mstore , mstore ); 248 SvSetSV (serializer_mstore , mstore );
254 SvSetSV (serializer_mretrieve, mretrieve); 249 SvSetSV (serializer_mretrieve, mretrieve);
255 storable_mstore = 250 SvREFCNT_dec (storable_mstore ); storable_mstore = 0;
256 storable_mretrieve = 0; 251 SvREFCNT_dec (storable_mretrieve); storable_mretrieve = 0;
257 252
258void 253void
259compress(data) 254compress(data)
260 SV * data 255 SV * data
256 ALIAS:
257 compress_best = 1
261 PROTOTYPE: $ 258 PROTOTYPE: $
262 PPCODE: 259 PPCODE:
263 XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U))); 260 XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U, ix)));
264 261
265void 262void
266decompress(data) 263decompress(data)
267 SV * data 264 SV * data
268 PROTOTYPE: $ 265 PROTOTYPE: $
… …
271 268
272void 269void
273sfreeze(sv) 270sfreeze(sv)
274 SV * sv 271 SV * sv
275 ALIAS: 272 ALIAS:
273 sfreeze = 0
276 sfreeze_cr = 1 274 sfreeze_cr = 1
277 sfreeze_c = 2 275 sfreeze_c = 2
276 sfreeze_best = 4
277 sfreeze_cr_best = 5
278 sfreeze_c_best = 6
278 PROTOTYPE: $ 279 PROTOTYPE: $
279 PPCODE: 280 PPCODE:
281{
282 int best = ix & 4;
283 ix &= 3;
280 284
281 SvGETMAGIC (sv); 285 SvGETMAGIC (sv);
282 286
283 if (!SvOK (sv)) 287 if (!SvOK (sv))
284 XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */ 288 XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */
285 else if (SvROK (sv) 289 else if (SvROK (sv)
290 || SvUTF8 (sv)
286 || (SvTYPE(sv) != SVt_IV 291 || (SvTYPE(sv) != SVt_IV
287 && SvTYPE(sv) != SVt_NV 292 && SvTYPE(sv) != SVt_NV
288 && SvTYPE(sv) != SVt_PV 293 && SvTYPE(sv) != SVt_PV
289 && SvTYPE(sv) != SVt_PVIV 294 && SvTYPE(sv) != SVt_PVIV
290 && SvTYPE(sv) != SVt_PVNV 295 && SvTYPE(sv) != SVt_PVNV
291 && SvTYPE(sv) != SVt_PVMG)) /* mstore */ 296 && SvTYPE(sv) != SVt_PVMG)) /* mstore */
292 { 297 {
293 int deref = !SvROK (sv); 298 int deref = !SvROK (sv);
299 char *pv;
294 300
295 if (!storable_mstore) 301 if (!storable_mstore)
302 {
303 PUTBACK;
296 need_storable (); 304 need_storable ();
305 SPAGAIN;
306 }
297 307
298 if (deref) 308 if (deref)
299 sv = newRV_noinc (sv); 309 sv = newRV_noinc (sv);
300 310
301 PUSHMARK (SP); 311 PUSHMARK (SP);
302 XPUSHs (sv); 312 XPUSHs (sv);
303 PUTBACK; 313 PUTBACK;
304 314
305 if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) 315 if (1 != call_sv ((SV *)storable_mstore, G_SCALAR))
306 croak ("Storable::mstore didn't return a single scalar"); 316 croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mstore));
307 317
308 SPAGAIN; 318 SPAGAIN;
309 319
310 sv = POPs; 320 sv = POPs;
321 pv = SvPV_nolen (sv);
311 322
312 if (SvPVX (sv)[0] == MAGIC_R) 323 if (*pv == MAGIC_R)
313 { 324 {
314 if (deref) 325 if (deref)
315 SvPVX (sv)[0] = MAGIC_R_deref; 326 *pv = MAGIC_R_deref;
316 } 327 }
317 else 328 else
318 { 329 {
319 char pfx[2]; 330 char pfx[2];
320 331
… …
323 334
324 sv_insert (sv, 0, 0, pfx, 2); 335 sv_insert (sv, 0, 0, pfx, 2);
325 } 336 }
326 337
327 if (ix) /* compress */ 338 if (ix) /* compress */
328 sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1)); 339 sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1, best));
329 340
330 XPUSHs (sv); 341 XPUSHs (sv);
331 } 342 }
332 else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) 343 else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI))
333 XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U))); /* need to prefix only */ 344 XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U, best))); /* need to prefix only */
334 else if (ix == 2) /* compress always */ 345 else if (ix == 2) /* compress always */
335 XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1))); 346 XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1, best)));
336 else if (SvNIOK (sv)) /* don't compress */ 347 else if (SvNIOK (sv)) /* don't compress */
337 { 348 {
338 STRLEN len; 349 STRLEN len;
339 char *s = SvPV (sv, len); 350 char *s = SvPV (sv, len);
340 XPUSHs (sv_2mortal (newSVpvn (s, len))); 351 XPUSHs (sv_2mortal (newSVpvn (s, len)));
341 } 352 }
342 else /* don't compress */ 353 else /* don't compress */
343 XPUSHs (sv_2mortal (newSVsv (sv))); 354 XPUSHs (sv_2mortal (newSVsv (sv)));
355}
344 356
345void 357void
346sthaw(sv) 358sthaw(sv)
347 SV * sv 359 SV * sv
348 PROTOTYPE: $ 360 PROTOTYPE: $
… …
350{ 362{
351 STRLEN svlen; 363 STRLEN svlen;
352 int deref = 0; 364 int deref = 0;
353 365
354 SvGETMAGIC (sv); 366 SvGETMAGIC (sv);
355 if (SvPOK (sv) && IN_RANGE (SvPV (sv, svlen)[0], MAGIC_LO, MAGIC_HI)) 367 if (SvPOK (sv) && IN_RANGE (SvPVbyte (sv, svlen)[0], MAGIC_LO, MAGIC_HI))
356 { 368 {
357 redo: 369 redo:
358 370
359 switch (SvPVX (sv)[0]) 371 switch (SvPVX (sv)[0])
360 { 372 {
… …
369 croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); 381 croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
370 382
371 sv_chop (sv, SvPVX (sv) + 2); 383 sv_chop (sv, SvPVX (sv) + 2);
372 384
373 if (!storable_mstore) 385 if (!storable_mstore)
386 {
387 PUTBACK;
374 need_storable (); 388 need_storable ();
389 SPAGAIN;
390 }
375 391
376 PUSHMARK (SP); 392 PUSHMARK (SP);
377 XPUSHs (sv); 393 XPUSHs (sv);
378 PUTBACK; 394 PUTBACK;
379 395
380 if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) 396 if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
381 croak ("Storable::mstore didn't return a single scalar"); 397 croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));
382 398
383 SPAGAIN; 399 SPAGAIN;
384 400
385 if (deref) 401 if (deref)
386 SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); 402 SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));
… …
413 goto redo; 429 goto redo;
414 430
415 case MAGIC_R: 431 case MAGIC_R:
416 handle_MAGIC_R: 432 handle_MAGIC_R:
417 if (!storable_mstore) 433 if (!storable_mstore)
434 {
435 PUTBACK;
418 need_storable (); 436 need_storable ();
437 SPAGAIN;
438 }
419 439
420 PUSHMARK (SP); 440 PUSHMARK (SP);
421 XPUSHs (sv); 441 XPUSHs (sv);
422 PUTBACK; 442 PUTBACK;
423 443
424 if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) 444 if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
425 croak ("Storable::mstore didn't return a single scalar"); 445 croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));
426 446
427 SPAGAIN; 447 SPAGAIN;
428 448
429 if (deref) 449 if (deref)
430 { 450 {

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