1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
#include "perlmulticore.h" |
6 |
|
7 |
#define LZF_STANDALONE 1 |
8 |
#define LZF_STATE_ARG 1 |
9 |
|
10 |
#include "lzf_c.c" |
11 |
#include "lzf_d.c" |
12 |
#include "lzf_c_best.c" |
13 |
|
14 |
/* we re-use the storable header for our purposes */ |
15 |
#define MAGIC_LO 0 |
16 |
#define MAGIC_U 0 /* uncompressed data follows */ |
17 |
#define MAGIC_C 1 /* compressed data follows */ |
18 |
#define MAGIC_undef 2 /* the special value undef */ |
19 |
#define MAGIC_CR 3 /* storable (reference, freeze), compressed */ |
20 |
#define MAGIC_R 4 /* storable (reference, freeze) */ |
21 |
#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */ |
22 |
#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */ |
23 |
#define MAGIC_HI 7 /* room for one higher storable major */ |
24 |
/* for historical reasons, MAGIC_undef + MAGIC_R and MAGIC_undef + MAGIC_R_deref are used, too */ |
25 |
|
26 |
#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l)) |
27 |
|
28 |
static SV *serializer_package, *serializer_mstore, *serializer_mretrieve; |
29 |
static CV *storable_mstore, *storable_mretrieve; |
30 |
|
31 |
#if Size_t_size > 4 |
32 |
# define MAX_LENGTH ((Size_t)0x80000000L) |
33 |
#else |
34 |
# define MAX_LENGTH ((Size_t) 0x8000000L) |
35 |
#endif |
36 |
|
37 |
static SV * |
38 |
compress_sv (SV *data, char cprepend, int uprepend, int best) |
39 |
{ |
40 |
LZF_STATE *state; |
41 |
STRLEN usize, csize; |
42 |
char *src = (char *)SvPVbyte (data, usize); |
43 |
|
44 |
if (usize) |
45 |
{ |
46 |
SV *ret = NEWSV (0, usize + 1); |
47 |
unsigned char *dst; |
48 |
int skip = 0; |
49 |
|
50 |
SvPOK_only (ret); |
51 |
dst = (unsigned char *)SvPVX (ret); |
52 |
|
53 |
if (cprepend) |
54 |
dst[skip++] = cprepend; |
55 |
|
56 |
if (usize <= 0x7f) |
57 |
{ |
58 |
dst[skip++] = usize; |
59 |
} |
60 |
else if (usize <= 0x7ff) |
61 |
{ |
62 |
dst[skip++] = (( usize >> 6) | 0xc0); |
63 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
64 |
} |
65 |
else if (usize <= 0xffff) |
66 |
{ |
67 |
dst[skip++] = (( usize >> 12) | 0xe0); |
68 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
69 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
70 |
} |
71 |
else if (usize <= 0x1fffff) |
72 |
{ |
73 |
dst[skip++] = (( usize >> 18) | 0xf0); |
74 |
dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
75 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
76 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
77 |
} |
78 |
else if (usize <= 0x3ffffff) |
79 |
{ |
80 |
dst[skip++] = (( usize >> 24) | 0xf8); |
81 |
dst[skip++] = (((usize >> 18) & 0x3f) | 0x80); |
82 |
dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
83 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
84 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
85 |
} |
86 |
else if (usize <= 0x7fffffff) |
87 |
{ |
88 |
dst[skip++] = (( usize >> 30) | 0xfc); |
89 |
dst[skip++] = (((usize >> 24) & 0x3f) | 0x80); |
90 |
dst[skip++] = (((usize >> 18) & 0x3f) | 0x80); |
91 |
dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
92 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
93 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
94 |
} |
95 |
else |
96 |
croak ("compress can only compress up to %ld bytes", 0x7fffffffL); |
97 |
|
98 |
New (0, state, 1, LZF_STATE); |
99 |
if (!state) |
100 |
croak ("Compress::LZF unable to allocate memory for compression state"); |
101 |
|
102 |
if (usize > 2000) perlinterp_release (); |
103 |
/* 11 bytes is the smallest compressible string */ |
104 |
csize = usize < 11 ? 0 : |
105 |
(best ? lzf_compress_best (src, usize, dst + skip, usize - skip) |
106 |
: lzf_compress (src, usize, dst + skip, usize - skip, *state)); |
107 |
if (usize > 2000) perlinterp_acquire (); |
108 |
|
109 |
Safefree (state); |
110 |
|
111 |
if (csize) |
112 |
{ |
113 |
SvCUR_set (ret, csize + skip); |
114 |
} |
115 |
else if (uprepend < 0) |
116 |
{ |
117 |
SvREFCNT_dec (ret); |
118 |
ret = SvREFCNT_inc (data); |
119 |
} |
120 |
else |
121 |
{ |
122 |
*dst++ = uprepend; |
123 |
|
124 |
Move ((void *)src, (void *)dst, usize, unsigned char); |
125 |
|
126 |
SvCUR_set (ret, usize + 1); |
127 |
} |
128 |
|
129 |
return ret; |
130 |
} |
131 |
else |
132 |
return newSVpv ("", 0); |
133 |
} |
134 |
|
135 |
static SV * |
136 |
decompress_sv (SV *data, int skip) |
137 |
{ |
138 |
STRLEN usize, csize; |
139 |
unsigned char *src = (unsigned char *)SvPVbyte (data, csize) + skip; |
140 |
|
141 |
if (csize) |
142 |
{ |
143 |
void *dst; |
144 |
SV *ret; |
145 |
int res; |
146 |
|
147 |
csize -= skip; |
148 |
|
149 |
if (src[0]) |
150 |
{ |
151 |
if (!(src[0] & 0x80) && csize >= 1) |
152 |
{ |
153 |
csize -= 1; |
154 |
usize = *src++ & 0xff; |
155 |
} |
156 |
else if (!(src[0] & 0x20) && csize >= 2) |
157 |
{ |
158 |
csize -= 2; |
159 |
usize = *src++ & 0x1f; |
160 |
usize = (usize << 6) | (*src++ & 0x3f); |
161 |
} |
162 |
else if (!(src[0] & 0x10) && csize >= 3) |
163 |
{ |
164 |
csize -= 3; |
165 |
usize = *src++ & 0x0f; |
166 |
usize = (usize << 6) | (*src++ & 0x3f); |
167 |
usize = (usize << 6) | (*src++ & 0x3f); |
168 |
} |
169 |
else if (!(src[0] & 0x08) && csize >= 4) |
170 |
{ |
171 |
csize -= 4; |
172 |
usize = *src++ & 0x07; |
173 |
usize = (usize << 6) | (*src++ & 0x3f); |
174 |
usize = (usize << 6) | (*src++ & 0x3f); |
175 |
usize = (usize << 6) | (*src++ & 0x3f); |
176 |
} |
177 |
else if (!(src[0] & 0x04) && csize >= 5) |
178 |
{ |
179 |
csize -= 5; |
180 |
usize = *src++ & 0x03; |
181 |
usize = (usize << 6) | (*src++ & 0x3f); |
182 |
usize = (usize << 6) | (*src++ & 0x3f); |
183 |
usize = (usize << 6) | (*src++ & 0x3f); |
184 |
usize = (usize << 6) | (*src++ & 0x3f); |
185 |
} |
186 |
else if (!(src[0] & 0x02) && csize >= 6) |
187 |
{ |
188 |
csize -= 6; |
189 |
usize = *src++ & 0x01; |
190 |
usize = (usize << 6) | (*src++ & 0x3f); |
191 |
usize = (usize << 6) | (*src++ & 0x3f); |
192 |
usize = (usize << 6) | (*src++ & 0x3f); |
193 |
usize = (usize << 6) | (*src++ & 0x3f); |
194 |
usize = (usize << 6) | (*src++ & 0x3f); |
195 |
} |
196 |
else |
197 |
croak ("compressed data corrupted (invalid length)"); |
198 |
|
199 |
if (!usize) |
200 |
croak ("compressed data corrupted (invalid length)"); |
201 |
|
202 |
ret = NEWSV (0, usize); |
203 |
SvPOK_only (ret); |
204 |
dst = SvPVX (ret); |
205 |
|
206 |
if (usize > 4000) perlinterp_release (); |
207 |
res = lzf_decompress (src, csize, dst, usize) != usize; |
208 |
if (usize > 4000) perlinterp_acquire (); |
209 |
|
210 |
if (res) |
211 |
{ |
212 |
SvREFCNT_dec (ret); |
213 |
croak ("compressed data corrupted (size mismatch)", csize, skip, usize); |
214 |
} |
215 |
} |
216 |
else |
217 |
{ |
218 |
usize = csize - 1; |
219 |
ret = NEWSV (0, usize | 1); |
220 |
SvPOK_only (ret); |
221 |
|
222 |
Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char); |
223 |
} |
224 |
|
225 |
SvCUR_set (ret, usize); |
226 |
|
227 |
return ret; |
228 |
} |
229 |
else |
230 |
return newSVpvn ("", 0); |
231 |
} |
232 |
|
233 |
static void |
234 |
need_storable (void) |
235 |
{ |
236 |
eval_sv (sv_2mortal (newSVpvf ("require %s", SvPVbyte_nolen (serializer_package))), G_VOID | G_DISCARD); |
237 |
|
238 |
storable_mstore = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mstore ), TRUE, SVt_PVCV))); |
239 |
storable_mretrieve = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mretrieve), TRUE, SVt_PVCV))); |
240 |
} |
241 |
|
242 |
MODULE = Compress::LZF PACKAGE = Compress::LZF |
243 |
|
244 |
BOOT: |
245 |
serializer_package = newSVpv ("Storable", 0); |
246 |
serializer_mstore = newSVpv ("Storable::net_mstore", 0); |
247 |
serializer_mretrieve = newSVpv ("Storable::mretrieve", 0); |
248 |
|
249 |
void |
250 |
set_serializer(package, mstore, mretrieve) |
251 |
SV * package |
252 |
SV * mstore |
253 |
SV * mretrieve |
254 |
PROTOTYPE: $$$ |
255 |
PPCODE: |
256 |
SvSetSV (serializer_package , package ); |
257 |
SvSetSV (serializer_mstore , mstore ); |
258 |
SvSetSV (serializer_mretrieve, mretrieve); |
259 |
SvREFCNT_dec (storable_mstore ); storable_mstore = 0; |
260 |
SvREFCNT_dec (storable_mretrieve); storable_mretrieve = 0; |
261 |
|
262 |
void |
263 |
compress(data) |
264 |
SV * data |
265 |
ALIAS: |
266 |
compress_best = 1 |
267 |
PROTOTYPE: $ |
268 |
PPCODE: |
269 |
XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U, ix))); |
270 |
|
271 |
void |
272 |
decompress(data) |
273 |
SV * data |
274 |
PROTOTYPE: $ |
275 |
PPCODE: |
276 |
XPUSHs (sv_2mortal (decompress_sv (data, 0))); |
277 |
|
278 |
void |
279 |
sfreeze(sv) |
280 |
SV * sv |
281 |
ALIAS: |
282 |
sfreeze = 0 |
283 |
sfreeze_cr = 1 |
284 |
sfreeze_c = 2 |
285 |
sfreeze_best = 4 |
286 |
sfreeze_cr_best = 5 |
287 |
sfreeze_c_best = 6 |
288 |
PROTOTYPE: $ |
289 |
PPCODE: |
290 |
{ |
291 |
int best = ix & 4; |
292 |
ix &= 3; |
293 |
|
294 |
SvGETMAGIC (sv); |
295 |
|
296 |
if (!SvOK (sv)) |
297 |
XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */ |
298 |
else if (SvROK (sv) |
299 |
|| SvUTF8 (sv) |
300 |
|| (SvTYPE(sv) != SVt_IV |
301 |
&& SvTYPE(sv) != SVt_NV |
302 |
&& SvTYPE(sv) != SVt_PV |
303 |
&& SvTYPE(sv) != SVt_PVIV |
304 |
&& SvTYPE(sv) != SVt_PVNV |
305 |
&& SvTYPE(sv) != SVt_PVMG)) /* mstore */ |
306 |
{ |
307 |
int deref = !SvROK (sv); |
308 |
char *pv; |
309 |
|
310 |
if (!storable_mstore) |
311 |
{ |
312 |
PUTBACK; |
313 |
need_storable (); |
314 |
SPAGAIN; |
315 |
} |
316 |
|
317 |
if (deref) |
318 |
sv = newRV_noinc (sv); |
319 |
|
320 |
PUSHMARK (SP); |
321 |
XPUSHs (sv); |
322 |
PUTBACK; |
323 |
|
324 |
if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) |
325 |
croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mstore)); |
326 |
|
327 |
SPAGAIN; |
328 |
|
329 |
sv = POPs; |
330 |
pv = SvPV_nolen (sv); |
331 |
|
332 |
if (*pv == MAGIC_R) |
333 |
{ |
334 |
if (deref) |
335 |
*pv = MAGIC_R_deref; |
336 |
} |
337 |
else |
338 |
{ |
339 |
char pfx[2]; |
340 |
|
341 |
pfx[0] = MAGIC_undef; |
342 |
pfx[1] = deref ? MAGIC_R_deref : MAGIC_R; |
343 |
|
344 |
sv_insert (sv, 0, 0, pfx, 2); |
345 |
} |
346 |
|
347 |
if (ix) /* compress */ |
348 |
sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1, best)); |
349 |
|
350 |
XPUSHs (sv); |
351 |
} |
352 |
else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) |
353 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U, best))); /* need to prefix only */ |
354 |
else if (ix == 2) /* compress always */ |
355 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1, best))); |
356 |
else if (SvNIOK (sv)) /* don't compress */ |
357 |
{ |
358 |
STRLEN len; |
359 |
char *s = SvPV (sv, len); |
360 |
XPUSHs (sv_2mortal (newSVpvn (s, len))); |
361 |
} |
362 |
else /* don't compress */ |
363 |
XPUSHs (sv_2mortal (newSVsv (sv))); |
364 |
} |
365 |
|
366 |
void |
367 |
sthaw(sv) |
368 |
SV * sv |
369 |
PROTOTYPE: $ |
370 |
PPCODE: |
371 |
{ |
372 |
STRLEN svlen; |
373 |
int deref = 0; |
374 |
|
375 |
SvGETMAGIC (sv); |
376 |
if (SvPOK (sv) && IN_RANGE (SvPVbyte (sv, svlen)[0], MAGIC_LO, MAGIC_HI)) |
377 |
{ |
378 |
redo: |
379 |
|
380 |
switch (SvPVX (sv)[0]) |
381 |
{ |
382 |
case MAGIC_undef: |
383 |
if (svlen <= 1) |
384 |
XPUSHs (sv_2mortal (NEWSV (0, 0))); |
385 |
else |
386 |
{ |
387 |
if (SvPVX (sv)[1] == MAGIC_R_deref) |
388 |
deref = 1; |
389 |
else if (SvPVX (sv)[1] != MAGIC_R) |
390 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
391 |
|
392 |
sv_chop (sv, SvPVX (sv) + 2); |
393 |
|
394 |
if (!storable_mstore) |
395 |
{ |
396 |
PUTBACK; |
397 |
need_storable (); |
398 |
SPAGAIN; |
399 |
} |
400 |
|
401 |
PUSHMARK (SP); |
402 |
XPUSHs (sv); |
403 |
PUTBACK; |
404 |
|
405 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
406 |
croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve)); |
407 |
|
408 |
SPAGAIN; |
409 |
|
410 |
if (deref) |
411 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
412 |
else |
413 |
SETs (sv_2mortal (newSVsv (TOPs))); |
414 |
} |
415 |
break; |
416 |
|
417 |
case MAGIC_U: |
418 |
XPUSHs (sv_2mortal (decompress_sv (sv, 0))); |
419 |
break; |
420 |
|
421 |
case MAGIC_C: |
422 |
XPUSHs (sv_2mortal (decompress_sv (sv, 1))); |
423 |
break; |
424 |
|
425 |
case MAGIC_R_deref: |
426 |
deref = 1; |
427 |
SvPVX (sv)[0] = MAGIC_R; |
428 |
goto handle_MAGIC_R; |
429 |
|
430 |
case MAGIC_CR_deref: |
431 |
deref = 1; |
432 |
case MAGIC_CR: |
433 |
sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ |
434 |
if (deref) |
435 |
if (SvPVX (sv)[0] == MAGIC_R_deref) |
436 |
SvPVX (sv)[0] = MAGIC_R; |
437 |
|
438 |
goto redo; |
439 |
|
440 |
case MAGIC_R: |
441 |
handle_MAGIC_R: |
442 |
if (!storable_mstore) |
443 |
{ |
444 |
PUTBACK; |
445 |
need_storable (); |
446 |
SPAGAIN; |
447 |
} |
448 |
|
449 |
PUSHMARK (SP); |
450 |
XPUSHs (sv); |
451 |
PUTBACK; |
452 |
|
453 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
454 |
croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve)); |
455 |
|
456 |
SPAGAIN; |
457 |
|
458 |
if (deref) |
459 |
{ |
460 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
461 |
|
462 |
if (SvPVX (sv)[0] == MAGIC_R) |
463 |
SvPVX (sv)[0] = MAGIC_R_deref; |
464 |
} |
465 |
else |
466 |
SETs (sv_2mortal (newSVsv (TOPs))); |
467 |
|
468 |
break; |
469 |
|
470 |
default: |
471 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
472 |
} |
473 |
} |
474 |
else |
475 |
XPUSHs (sv_2mortal (newSVsv (sv))); |
476 |
} |
477 |
|