ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/Compress-LZF/LZF.xs
(Generate patch)

Comparing Compress-LZF/LZF.xs (file contents):
Revision 1.19 by pcg, Tue Aug 3 15:07:51 2004 UTC vs.
Revision 1.28 by root, Wed Dec 17 00:04:56 2008 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"
19 10
20/* we re-use the storable header for our purposes */ 11/* we re-use the storable header for our purposes */
… …
25#define MAGIC_CR 3 /* storable (reference, freeze), compressed */ 16#define MAGIC_CR 3 /* storable (reference, freeze), compressed */
26#define MAGIC_R 4 /* storable (reference, freeze) */ 17#define MAGIC_R 4 /* storable (reference, freeze) */
27#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */ 18#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */
28#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */ 19#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */
29#define MAGIC_HI 7 /* room for one higher storable major */ 20#define MAGIC_HI 7 /* room for one higher storable major */
21/* for historical reasons, MAGIC_undef + MAGIC_R and MAGIC_undef + MAGIC_R_deref are used, too */
30 22
31#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l)) 23#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l))
32 24
33static SV *serializer_package, *serializer_mstore, *serializer_mretrieve; 25static SV *serializer_package, *serializer_mstore, *serializer_mretrieve;
34static CV *storable_mstore, *storable_mretrieve; 26static CV *storable_mstore, *storable_mretrieve;
27
28#if Size_t_size > 4
29# define MAX_LENGTH ((Size_t)0x80000000L)
30#else
31# define MAX_LENGTH ((Size_t) 0x8000000L)
32#endif
35 33
36static SV * 34static SV *
37compress_sv (SV *data, char cprepend, int uprepend) 35compress_sv (SV *data, char cprepend, int uprepend)
38{ 36{
37 LZF_STATE *state;
39 STRLEN usize, csize; 38 STRLEN usize, csize;
40 char *src = (char *)SvPV (data, usize); 39 char *src = (char *)SvPVbyte (data, usize);
41 40
42 if (usize) 41 if (usize)
43 { 42 {
44 SV *ret = NEWSV (0, usize + 1); 43 SV *ret = NEWSV (0, usize + 1);
45 unsigned char *dst; 44 unsigned char *dst;
… …
49 dst = (unsigned char *)SvPVX (ret); 48 dst = (unsigned char *)SvPVX (ret);
50 49
51 if (cprepend) 50 if (cprepend)
52 dst[skip++] = cprepend; 51 dst[skip++] = cprepend;
53 52
54 if (usize < 0x80) 53 if (usize <= 0x7f)
55 { 54 {
56 dst[skip++] = usize; 55 dst[skip++] = usize;
57 } 56 }
58 else if (usize < 0x800) 57 else if (usize <= 0x7ff)
59 { 58 {
60 dst[skip++] = (( usize >> 6) | 0xc0); 59 dst[skip++] = (( usize >> 6) | 0xc0);
61 dst[skip++] = (( usize & 0x3f) | 0x80); 60 dst[skip++] = (( usize & 0x3f) | 0x80);
62 } 61 }
63 else if (usize < 0x10000) 62 else if (usize <= 0xffff)
64 { 63 {
65 dst[skip++] = (( usize >> 12) | 0xe0); 64 dst[skip++] = (( usize >> 12) | 0xe0);
66 dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); 65 dst[skip++] = (((usize >> 6) & 0x3f) | 0x80);
67 dst[skip++] = (( usize & 0x3f) | 0x80); 66 dst[skip++] = (( usize & 0x3f) | 0x80);
68 } 67 }
69 else if (usize < 0x200000) 68 else if (usize <= 0x1fffff)
70 { 69 {
71 dst[skip++] = (( usize >> 18) | 0xf0); 70 dst[skip++] = (( usize >> 18) | 0xf0);
72 dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); 71 dst[skip++] = (((usize >> 12) & 0x3f) | 0x80);
73 dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); 72 dst[skip++] = (((usize >> 6) & 0x3f) | 0x80);
74 dst[skip++] = (( usize & 0x3f) | 0x80); 73 dst[skip++] = (( usize & 0x3f) | 0x80);
75 } 74 }
76 else if (usize < 0x4000000) 75 else if (usize <= 0x3ffffff)
77 { 76 {
78 dst[skip++] = (( usize >> 24) | 0xf8); 77 dst[skip++] = (( usize >> 24) | 0xf8);
79 dst[skip++] = (((usize >> 18) & 0x3f) | 0x80); 78 dst[skip++] = (((usize >> 18) & 0x3f) | 0x80);
80 dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); 79 dst[skip++] = (((usize >> 12) & 0x3f) | 0x80);
81 dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); 80 dst[skip++] = (((usize >> 6) & 0x3f) | 0x80);
82 dst[skip++] = (( usize & 0x3f) | 0x80); 81 dst[skip++] = (( usize & 0x3f) | 0x80);
83 } 82 }
83 else if (usize <= 0x7fffffff)
84 {
85 dst[skip++] = (( usize >> 30) | 0xfc);
86 dst[skip++] = (((usize >> 24) & 0x3f) | 0x80);
87 dst[skip++] = (((usize >> 18) & 0x3f) | 0x80);
88 dst[skip++] = (((usize >> 12) & 0x3f) | 0x80);
89 dst[skip++] = (((usize >> 6) & 0x3f) | 0x80);
90 dst[skip++] = (( usize & 0x3f) | 0x80);
91 }
84 else 92 else
85 croak ("compress can only compress up to %ld bytes", 0x4000000-1); 93 croak ("compress can only compress up to %ld bytes", 0x7fffffffL);
94
95 New (0, state, 1, LZF_STATE);
96 if (!state)
97 croak ("Compress::LZF unable to allocate memory for compression state");
86 98
87 /* 11 bytes is the smallest compressible string */ 99 /* 11 bytes is the smallest compressible string */
88 csize = usize < 11 ? 0 : 100 csize = usize < 11 ? 0 :
89 lzf_compress (src, usize, 101 lzf_compress (src, usize, dst + skip, usize - skip, *state);
90 dst + skip, 102
91 usize - skip); 103 Safefree (state);
92 104
93 if (csize) 105 if (csize)
94 { 106 {
95 SvCUR_set (ret, csize + skip); 107 SvCUR_set (ret, csize + skip);
96 } 108 }
… …
116 128
117static SV * 129static SV *
118decompress_sv (SV *data, int skip) 130decompress_sv (SV *data, int skip)
119{ 131{
120 STRLEN usize, csize; 132 STRLEN usize, csize;
121 unsigned char *src = (unsigned char *)SvPV (data, csize) + skip; 133 unsigned char *src = (unsigned char *)SvPVbyte (data, csize) + skip;
122 134
123 if (csize) 135 if (csize)
124 { 136 {
125 void *dst; 137 void *dst;
126 SV *ret; 138 SV *ret;
127 139
128 csize -= skip; 140 csize -= skip;
129 141
130 if (src[0]) 142 if (src[0])
131 { 143 {
132 if (!(src[0] & 0x80)) 144 if (!(src[0] & 0x80) && csize >= 1)
133 { 145 {
134 csize -= 1; 146 csize -= 1;
135 usize = *src++ & 0xff; 147 usize = *src++ & 0xff;
136 } 148 }
137 else if (!(src[0] & 0x20)) 149 else if (!(src[0] & 0x20) && csize >= 2)
138 { 150 {
139 csize -= 2; 151 csize -= 2;
140 usize = *src++ & 0x1f; 152 usize = *src++ & 0x1f;
141 usize = (usize << 6) | (*src++ & 0x3f); 153 usize = (usize << 6) | (*src++ & 0x3f);
142 } 154 }
143 else if (!(src[0] & 0x10)) 155 else if (!(src[0] & 0x10) && csize >= 3)
144 { 156 {
145 csize -= 3; 157 csize -= 3;
146 usize = *src++ & 0x0f; 158 usize = *src++ & 0x0f;
147 usize = (usize << 6) | (*src++ & 0x3f); 159 usize = (usize << 6) | (*src++ & 0x3f);
148 usize = (usize << 6) | (*src++ & 0x3f); 160 usize = (usize << 6) | (*src++ & 0x3f);
149 } 161 }
150 else if (!(src[0] & 0x08)) 162 else if (!(src[0] & 0x08) && csize >= 4)
151 { 163 {
152 csize -= 4; 164 csize -= 4;
153 usize = *src++ & 0x07; 165 usize = *src++ & 0x07;
154 usize = (usize << 6) | (*src++ & 0x3f); 166 usize = (usize << 6) | (*src++ & 0x3f);
155 usize = (usize << 6) | (*src++ & 0x3f); 167 usize = (usize << 6) | (*src++ & 0x3f);
156 usize = (usize << 6) | (*src++ & 0x3f); 168 usize = (usize << 6) | (*src++ & 0x3f);
157 } 169 }
158 else if (!(src[0] & 0x04)) 170 else if (!(src[0] & 0x04) && csize >= 5)
159 { 171 {
160 csize -= 5; 172 csize -= 5;
161 usize = *src++ & 0x03; 173 usize = *src++ & 0x03;
162 usize = (usize << 6) | (*src++ & 0x3f); 174 usize = (usize << 6) | (*src++ & 0x3f);
163 usize = (usize << 6) | (*src++ & 0x3f); 175 usize = (usize << 6) | (*src++ & 0x3f);
164 usize = (usize << 6) | (*src++ & 0x3f); 176 usize = (usize << 6) | (*src++ & 0x3f);
165 usize = (usize << 6) | (*src++ & 0x3f); 177 usize = (usize << 6) | (*src++ & 0x3f);
166 } 178 }
179 else if (!(src[0] & 0x02) && csize >= 6)
180 {
181 csize -= 6;
182 usize = *src++ & 0x01;
183 usize = (usize << 6) | (*src++ & 0x3f);
184 usize = (usize << 6) | (*src++ & 0x3f);
185 usize = (usize << 6) | (*src++ & 0x3f);
186 usize = (usize << 6) | (*src++ & 0x3f);
187 usize = (usize << 6) | (*src++ & 0x3f);
188 }
167 else 189 else
190 croak ("compressed data corrupted (invalid length)");
191
192 if (!usize)
168 croak ("compressed data corrupted (invalid length)"); 193 croak ("compressed data corrupted (invalid length)");
169 194
170 ret = NEWSV (0, usize); 195 ret = NEWSV (0, usize);
171 SvPOK_only (ret); 196 SvPOK_only (ret);
172 dst = SvPVX (ret); 197 dst = SvPVX (ret);
173 198
174 if (lzf_decompress (src, csize, dst, usize) != usize) 199 if (lzf_decompress (src, csize, dst, usize) != usize)
200 {
201 SvREFCNT_dec (ret);
175 croak ("compressed data corrupted (size mismatch)", csize, skip, usize); 202 croak ("compressed data corrupted (size mismatch)", csize, skip, usize);
203 }
176 } 204 }
177 else 205 else
178 { 206 {
179 usize = csize - 1; 207 usize = csize - 1;
180 ret = NEWSV (0, usize); 208 ret = NEWSV (0, usize | 1);
181 SvPOK_only (ret); 209 SvPOK_only (ret);
182 210
183 Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char); 211 Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char);
184 } 212 }
185 213
… …
190 else 218 else
191 return newSVpvn ("", 0); 219 return newSVpvn ("", 0);
192} 220}
193 221
194static void 222static void
195need_storable(void) 223need_storable (void)
196{ 224{
197#if PATCHLEVEL < 6 225 require_pv (SvPVbyte_nolen (serializer_package));
198 char req[8192];
199 sprintf (req, "require %s;", SvPV_nolen (serializer_package));
200 perl_eval_pv (req, 1);
201#else
202 load_module (PERL_LOADMOD_NOIMPORT, serializer_package, Nullsv);
203#endif
204 226
205 storable_mstore = GvCV (gv_fetchpv (SvPV_nolen (serializer_mstore ), TRUE, SVt_PVCV)); 227 storable_mstore = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mstore ), TRUE, SVt_PVCV)));
206 storable_mretrieve = GvCV (gv_fetchpv (SvPV_nolen (serializer_mretrieve), TRUE, SVt_PVCV)); 228 storable_mretrieve = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mretrieve), TRUE, SVt_PVCV)));
207} 229}
208 230
209MODULE = Compress::LZF PACKAGE = Compress::LZF 231MODULE = Compress::LZF PACKAGE = Compress::LZF
210 232
211BOOT: 233BOOT:
212 serializer_package = newSVpv ("Storable", 0); 234 serializer_package = newSVpv ("Storable", 0);
213 serializer_mstore = newSVpv ("Storable::mstore", 0); 235 serializer_mstore = newSVpv ("Storable::net_mstore", 0);
214 serializer_mretrieve = newSVpv ("Storable::mretrieve", 0); 236 serializer_mretrieve = newSVpv ("Storable::mretrieve", 0);
215 237
216void 238void
217set_serializer(package, mstore, mretrieve) 239set_serializer(package, mstore, mretrieve)
218 SV * package 240 SV * package
… …
221 PROTOTYPE: $$$ 243 PROTOTYPE: $$$
222 PPCODE: 244 PPCODE:
223 SvSetSV (serializer_package , package ); 245 SvSetSV (serializer_package , package );
224 SvSetSV (serializer_mstore , mstore ); 246 SvSetSV (serializer_mstore , mstore );
225 SvSetSV (serializer_mretrieve, mretrieve); 247 SvSetSV (serializer_mretrieve, mretrieve);
226 storable_mstore = 248 SvREFCNT_dec (storable_mstore ); storable_mstore = 0;
227 storable_mretrieve = 0; 249 SvREFCNT_dec (storable_mretrieve); storable_mretrieve = 0;
228 250
229void 251void
230compress(data) 252compress(data)
231 SV * data 253 SV * data
232 PROTOTYPE: $ 254 PROTOTYPE: $
… …
252 SvGETMAGIC (sv); 274 SvGETMAGIC (sv);
253 275
254 if (!SvOK (sv)) 276 if (!SvOK (sv))
255 XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */ 277 XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */
256 else if (SvROK (sv) 278 else if (SvROK (sv)
279 || SvUTF8 (sv)
257 || (SvTYPE(sv) != SVt_IV 280 || (SvTYPE(sv) != SVt_IV
258 && SvTYPE(sv) != SVt_NV 281 && SvTYPE(sv) != SVt_NV
259 && SvTYPE(sv) != SVt_PV 282 && SvTYPE(sv) != SVt_PV
260 && SvTYPE(sv) != SVt_PVIV 283 && SvTYPE(sv) != SVt_PVIV
261 && SvTYPE(sv) != SVt_PVNV 284 && SvTYPE(sv) != SVt_PVNV
262 && SvTYPE(sv) != SVt_PVMG)) /* mstore */ 285 && SvTYPE(sv) != SVt_PVMG)) /* mstore */
263 { 286 {
264 int deref = !SvROK (sv); 287 int deref = !SvROK (sv);
288 char *pv;
265 289
266 if (!storable_mstore) 290 if (!storable_mstore)
291 {
292 PUTBACK;
267 need_storable (); 293 need_storable ();
294 SPAGAIN;
295 }
268 296
269 if (deref) 297 if (deref)
270 sv = newRV_noinc (sv); 298 sv = newRV_noinc (sv);
271 299
272 PUSHMARK (SP); 300 PUSHMARK (SP);
273 XPUSHs (sv); 301 XPUSHs (sv);
274 PUTBACK; 302 PUTBACK;
275 303
276 if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) 304 if (1 != call_sv ((SV *)storable_mstore, G_SCALAR))
277 croak ("Storable::mstore didn't return a single scalar"); 305 croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mstore));
278 306
279 SPAGAIN; 307 SPAGAIN;
280 308
281 sv = POPs; 309 sv = POPs;
310 pv = SvPV_nolen (sv);
282 311
283 if (SvPVX (sv)[0] != MAGIC_R) 312 if (*pv == MAGIC_R)
284 croak ("Storable format changed, need newer version of Compress::LZF"); 313 {
285
286 if (deref) 314 if (deref)
287 SvPVX (sv)[0] = MAGIC_R_deref; 315 *pv = MAGIC_R_deref;
316 }
317 else
318 {
319 char pfx[2];
320
321 pfx[0] = MAGIC_undef;
322 pfx[1] = deref ? MAGIC_R_deref : MAGIC_R;
323
324 sv_insert (sv, 0, 0, pfx, 2);
325 }
288 326
289 if (ix) /* compress */ 327 if (ix) /* compress */
290 sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1)); 328 sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1));
291 329
292 XPUSHs (sv); 330 XPUSHs (sv);
… …
307void 345void
308sthaw(sv) 346sthaw(sv)
309 SV * sv 347 SV * sv
310 PROTOTYPE: $ 348 PROTOTYPE: $
311 PPCODE: 349 PPCODE:
312 350{
351 STRLEN svlen;
313 int deref = 0; 352 int deref = 0;
314 353
315 SvGETMAGIC (sv); 354 SvGETMAGIC (sv);
316 if (SvPOK (sv) && IN_RANGE (SvPV_nolen (sv)[0], MAGIC_LO, MAGIC_HI)) 355 if (SvPOK (sv) && IN_RANGE (SvPVbyte (sv, svlen)[0], MAGIC_LO, MAGIC_HI))
317 { 356 {
357 redo:
358
318 switch (SvPVX (sv)[0]) 359 switch (SvPVX (sv)[0])
319 { 360 {
320 case MAGIC_undef: 361 case MAGIC_undef:
362 if (svlen <= 1)
321 XPUSHs (sv_2mortal (NEWSV (0, 0))); 363 XPUSHs (sv_2mortal (NEWSV (0, 0)));
364 else
365 {
366 if (SvPVX (sv)[1] == MAGIC_R_deref)
367 deref = 1;
368 else if (SvPVX (sv)[1] != MAGIC_R)
369 croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
370
371 sv_chop (sv, SvPVX (sv) + 2);
372
373 if (!storable_mstore)
374 {
375 PUTBACK;
376 need_storable ();
377 SPAGAIN;
378 }
379
380 PUSHMARK (SP);
381 XPUSHs (sv);
382 PUTBACK;
383
384 if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
385 croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));
386
387 SPAGAIN;
388
389 if (deref)
390 SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));
391 else
392 SETs (sv_2mortal (newSVsv (TOPs)));
393 }
322 break; 394 break;
323 395
324 case MAGIC_U: 396 case MAGIC_U:
325 XPUSHs (sv_2mortal (decompress_sv (sv, 0))); 397 XPUSHs (sv_2mortal (decompress_sv (sv, 0)));
326 break; 398 break;
… …
339 case MAGIC_CR: 411 case MAGIC_CR:
340 sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ 412 sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */
341 if (deref) 413 if (deref)
342 if (SvPVX (sv)[0] == MAGIC_R_deref) 414 if (SvPVX (sv)[0] == MAGIC_R_deref)
343 SvPVX (sv)[0] = MAGIC_R; 415 SvPVX (sv)[0] = MAGIC_R;
344 else 416
345 croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); 417 goto redo;
346 418
347 case MAGIC_R: 419 case MAGIC_R:
348 handle_MAGIC_R: 420 handle_MAGIC_R:
349 if (!storable_mstore) 421 if (!storable_mstore)
422 {
423 PUTBACK;
350 need_storable (); 424 need_storable ();
425 SPAGAIN;
426 }
351 427
352 PUSHMARK (SP); 428 PUSHMARK (SP);
353 XPUSHs (sv); 429 XPUSHs (sv);
354 PUTBACK; 430 PUTBACK;
355 431
356 if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) 432 if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
357 croak ("Storable::mstore didn't return a single scalar"); 433 croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));
358 434
359 SPAGAIN; 435 SPAGAIN;
360 436
361 if (deref) 437 if (deref)
362 { 438 {
… …
374 croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); 450 croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
375 } 451 }
376 } 452 }
377 else 453 else
378 XPUSHs (sv_2mortal (newSVsv (sv))); 454 XPUSHs (sv_2mortal (newSVsv (sv)));
455}
379 456

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines