1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
/* try to be compatible with older perls */ |
6 |
/* SvPV_nolen() macro first defined in 5.005_55 */ |
7 |
/* this is slow, not threadsafe, but works */ |
8 |
#include "patchlevel.h" |
9 |
#if (PATCHLEVEL == 4) || ((PATCHLEVEL == 5) && (SUBVERSION < 55)) |
10 |
static 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 |
|
17 |
#define LZF_STANDALONE 1 |
18 |
#define LZF_STATE_ARG 1 |
19 |
|
20 |
#include "lzf_c.c" |
21 |
#include "lzf_d.c" |
22 |
|
23 |
/* we re-use the storable header for our purposes */ |
24 |
#define MAGIC_LO 0 |
25 |
#define MAGIC_U 0 /* uncompressed data follows */ |
26 |
#define MAGIC_C 1 /* compressed data follows */ |
27 |
#define MAGIC_undef 2 /* the special value undef */ |
28 |
#define MAGIC_CR 3 /* storable (reference, freeze), compressed */ |
29 |
#define MAGIC_R 4 /* storable (reference, freeze) */ |
30 |
#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */ |
31 |
#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */ |
32 |
#define MAGIC_HI 7 /* room for one higher storable major */ |
33 |
/* for historical reasons, MAGIC_undef + MAGIC_R and MAGIC_undef + MAGIC_R_deref are used, too */ |
34 |
|
35 |
#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l)) |
36 |
|
37 |
static SV *serializer_package, *serializer_mstore, *serializer_mretrieve; |
38 |
static CV *storable_mstore, *storable_mretrieve; |
39 |
|
40 |
#if Size_t_size > 4 |
41 |
# define MAX_LENGTH ((Size_t)0x80000000L) |
42 |
#else |
43 |
# define MAX_LENGTH ((Size_t) 0x8000000L) |
44 |
#endif |
45 |
|
46 |
static SV * |
47 |
compress_sv (SV *data, char cprepend, int uprepend) |
48 |
{ |
49 |
LZF_STATE *state; |
50 |
STRLEN usize, csize; |
51 |
char *src = (char *)SvPV (data, usize); |
52 |
|
53 |
if (usize) |
54 |
{ |
55 |
SV *ret = NEWSV (0, usize + 1); |
56 |
unsigned char *dst; |
57 |
int skip = 0; |
58 |
|
59 |
SvPOK_only (ret); |
60 |
dst = (unsigned char *)SvPVX (ret); |
61 |
|
62 |
if (cprepend) |
63 |
dst[skip++] = cprepend; |
64 |
|
65 |
if (usize <= 0x7f) |
66 |
{ |
67 |
dst[skip++] = usize; |
68 |
} |
69 |
else if (usize <= 0x7ff) |
70 |
{ |
71 |
dst[skip++] = (( usize >> 6) | 0xc0); |
72 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
73 |
} |
74 |
else if (usize <= 0xffff) |
75 |
{ |
76 |
dst[skip++] = (( usize >> 12) | 0xe0); |
77 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
78 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
79 |
} |
80 |
else if (usize <= 0x1fffff) |
81 |
{ |
82 |
dst[skip++] = (( usize >> 18) | 0xf0); |
83 |
dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
84 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
85 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
86 |
} |
87 |
else if (usize <= 0x3ffffff) |
88 |
{ |
89 |
dst[skip++] = (( usize >> 24) | 0xf8); |
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 if (usize <= 0x7fffffff) |
96 |
{ |
97 |
dst[skip++] = (( usize >> 30) | 0xfc); |
98 |
dst[skip++] = (((usize >> 24) & 0x3f) | 0x80); |
99 |
dst[skip++] = (((usize >> 18) & 0x3f) | 0x80); |
100 |
dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
101 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
102 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
103 |
} |
104 |
else |
105 |
croak ("compress can only compress up to %ld bytes", 0x7fffffffL); |
106 |
|
107 |
New (0, state, 1, LZF_STATE); |
108 |
if (!state) |
109 |
croak ("Compress::LZF unable to allocate memory for compression state"); |
110 |
|
111 |
/* 11 bytes is the smallest compressible string */ |
112 |
csize = usize < 11 ? 0 : |
113 |
lzf_compress (src, usize, dst + skip, usize - skip, *state); |
114 |
|
115 |
Safefree (state); |
116 |
|
117 |
if (csize) |
118 |
{ |
119 |
SvCUR_set (ret, csize + skip); |
120 |
} |
121 |
else if (uprepend < 0) |
122 |
{ |
123 |
SvREFCNT_dec (ret); |
124 |
ret = SvREFCNT_inc (data); |
125 |
} |
126 |
else |
127 |
{ |
128 |
*dst++ = uprepend; |
129 |
|
130 |
Move ((void *)src, (void *)dst, usize, unsigned char); |
131 |
|
132 |
SvCUR_set (ret, usize + 1); |
133 |
} |
134 |
|
135 |
return ret; |
136 |
} |
137 |
else |
138 |
return newSVpv ("", 0); |
139 |
} |
140 |
|
141 |
static SV * |
142 |
decompress_sv (SV *data, int skip) |
143 |
{ |
144 |
STRLEN usize, csize; |
145 |
unsigned char *src = (unsigned char *)SvPV (data, csize) + skip; |
146 |
|
147 |
if (csize) |
148 |
{ |
149 |
void *dst; |
150 |
SV *ret; |
151 |
|
152 |
csize -= skip; |
153 |
|
154 |
if (src[0]) |
155 |
{ |
156 |
if (!(src[0] & 0x80) && csize >= 1) |
157 |
{ |
158 |
csize -= 1; |
159 |
usize = *src++ & 0xff; |
160 |
} |
161 |
else if (!(src[0] & 0x20) && csize >= 2) |
162 |
{ |
163 |
csize -= 2; |
164 |
usize = *src++ & 0x1f; |
165 |
usize = (usize << 6) | (*src++ & 0x3f); |
166 |
} |
167 |
else if (!(src[0] & 0x10) && csize >= 3) |
168 |
{ |
169 |
csize -= 3; |
170 |
usize = *src++ & 0x0f; |
171 |
usize = (usize << 6) | (*src++ & 0x3f); |
172 |
usize = (usize << 6) | (*src++ & 0x3f); |
173 |
} |
174 |
else if (!(src[0] & 0x08) && csize >= 4) |
175 |
{ |
176 |
csize -= 4; |
177 |
usize = *src++ & 0x07; |
178 |
usize = (usize << 6) | (*src++ & 0x3f); |
179 |
usize = (usize << 6) | (*src++ & 0x3f); |
180 |
usize = (usize << 6) | (*src++ & 0x3f); |
181 |
} |
182 |
else if (!(src[0] & 0x04) && csize >= 5) |
183 |
{ |
184 |
csize -= 5; |
185 |
usize = *src++ & 0x03; |
186 |
usize = (usize << 6) | (*src++ & 0x3f); |
187 |
usize = (usize << 6) | (*src++ & 0x3f); |
188 |
usize = (usize << 6) | (*src++ & 0x3f); |
189 |
usize = (usize << 6) | (*src++ & 0x3f); |
190 |
} |
191 |
else if (!(src[0] & 0x02) && csize >= 6) |
192 |
{ |
193 |
csize -= 6; |
194 |
usize = *src++ & 0x01; |
195 |
usize = (usize << 6) | (*src++ & 0x3f); |
196 |
usize = (usize << 6) | (*src++ & 0x3f); |
197 |
usize = (usize << 6) | (*src++ & 0x3f); |
198 |
usize = (usize << 6) | (*src++ & 0x3f); |
199 |
usize = (usize << 6) | (*src++ & 0x3f); |
200 |
} |
201 |
else |
202 |
croak ("compressed data corrupted (invalid length)"); |
203 |
|
204 |
if (!usize) |
205 |
croak ("compressed data corrupted (invalid length)"); |
206 |
|
207 |
ret = NEWSV (0, usize); |
208 |
SvPOK_only (ret); |
209 |
dst = SvPVX (ret); |
210 |
|
211 |
if (lzf_decompress (src, csize, dst, usize) != usize) |
212 |
{ |
213 |
SvREFCNT_dec (ret); |
214 |
croak ("compressed data corrupted (size mismatch)", csize, skip, usize); |
215 |
} |
216 |
} |
217 |
else |
218 |
{ |
219 |
usize = csize - 1; |
220 |
ret = NEWSV (0, usize | 1); |
221 |
SvPOK_only (ret); |
222 |
|
223 |
Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char); |
224 |
} |
225 |
|
226 |
SvCUR_set (ret, usize); |
227 |
|
228 |
return ret; |
229 |
} |
230 |
else |
231 |
return newSVpvn ("", 0); |
232 |
} |
233 |
|
234 |
static void |
235 |
need_storable(void) |
236 |
{ |
237 |
#if PATCHLEVEL < 6 |
238 |
char req[8192]; |
239 |
sprintf (req, "require %s;", SvPV_nolen (serializer_package)); |
240 |
perl_eval_pv (req, 1); |
241 |
#else |
242 |
load_module (PERL_LOADMOD_NOIMPORT, serializer_package, Nullsv); |
243 |
#endif |
244 |
|
245 |
storable_mstore = GvCV (gv_fetchpv (SvPV_nolen (serializer_mstore ), TRUE, SVt_PVCV)); |
246 |
storable_mretrieve = GvCV (gv_fetchpv (SvPV_nolen (serializer_mretrieve), TRUE, SVt_PVCV)); |
247 |
} |
248 |
|
249 |
MODULE = Compress::LZF PACKAGE = Compress::LZF |
250 |
|
251 |
BOOT: |
252 |
serializer_package = newSVpv ("Storable", 0); |
253 |
serializer_mstore = newSVpv ("Storable::net_mstore", 0); |
254 |
serializer_mretrieve = newSVpv ("Storable::mretrieve", 0); |
255 |
|
256 |
void |
257 |
set_serializer(package, mstore, mretrieve) |
258 |
SV * package |
259 |
SV * mstore |
260 |
SV * mretrieve |
261 |
PROTOTYPE: $$$ |
262 |
PPCODE: |
263 |
SvSetSV (serializer_package , package ); |
264 |
SvSetSV (serializer_mstore , mstore ); |
265 |
SvSetSV (serializer_mretrieve, mretrieve); |
266 |
storable_mstore = |
267 |
storable_mretrieve = 0; |
268 |
|
269 |
void |
270 |
compress(data) |
271 |
SV * data |
272 |
PROTOTYPE: $ |
273 |
PPCODE: |
274 |
XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U))); |
275 |
|
276 |
void |
277 |
decompress(data) |
278 |
SV * data |
279 |
PROTOTYPE: $ |
280 |
PPCODE: |
281 |
XPUSHs (sv_2mortal (decompress_sv (data, 0))); |
282 |
|
283 |
void |
284 |
sfreeze(sv) |
285 |
SV * sv |
286 |
ALIAS: |
287 |
sfreeze_cr = 1 |
288 |
sfreeze_c = 2 |
289 |
PROTOTYPE: $ |
290 |
PPCODE: |
291 |
|
292 |
SvGETMAGIC (sv); |
293 |
|
294 |
if (!SvOK (sv)) |
295 |
XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */ |
296 |
else if (SvROK (sv) |
297 |
|| (SvTYPE(sv) != SVt_IV |
298 |
&& SvTYPE(sv) != SVt_NV |
299 |
&& SvTYPE(sv) != SVt_PV |
300 |
&& SvTYPE(sv) != SVt_PVIV |
301 |
&& SvTYPE(sv) != SVt_PVNV |
302 |
&& SvTYPE(sv) != SVt_PVMG)) /* mstore */ |
303 |
{ |
304 |
int deref = !SvROK (sv); |
305 |
|
306 |
if (!storable_mstore) |
307 |
need_storable (); |
308 |
|
309 |
if (deref) |
310 |
sv = newRV_noinc (sv); |
311 |
|
312 |
PUSHMARK (SP); |
313 |
XPUSHs (sv); |
314 |
PUTBACK; |
315 |
|
316 |
if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) |
317 |
croak ("Storable::mstore didn't return a single scalar"); |
318 |
|
319 |
SPAGAIN; |
320 |
|
321 |
sv = POPs; |
322 |
|
323 |
if (SvPVX (sv)[0] == MAGIC_R) |
324 |
{ |
325 |
if (deref) |
326 |
SvPVX (sv)[0] = MAGIC_R_deref; |
327 |
} |
328 |
else |
329 |
{ |
330 |
char pfx[2]; |
331 |
|
332 |
pfx[0] = MAGIC_undef; |
333 |
pfx[1] = deref ? MAGIC_R_deref : MAGIC_R; |
334 |
|
335 |
sv_insert (sv, 0, 0, pfx, 2); |
336 |
} |
337 |
|
338 |
if (ix) /* compress */ |
339 |
sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1)); |
340 |
|
341 |
XPUSHs (sv); |
342 |
} |
343 |
else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) |
344 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U))); /* need to prefix only */ |
345 |
else if (ix == 2) /* compress always */ |
346 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1))); |
347 |
else if (SvNIOK (sv)) /* don't compress */ |
348 |
{ |
349 |
STRLEN len; |
350 |
char *s = SvPV (sv, len); |
351 |
XPUSHs (sv_2mortal (newSVpvn (s, len))); |
352 |
} |
353 |
else /* don't compress */ |
354 |
XPUSHs (sv_2mortal (newSVsv (sv))); |
355 |
|
356 |
void |
357 |
sthaw(sv) |
358 |
SV * sv |
359 |
PROTOTYPE: $ |
360 |
PPCODE: |
361 |
{ |
362 |
STRLEN svlen; |
363 |
int deref = 0; |
364 |
|
365 |
SvGETMAGIC (sv); |
366 |
if (SvPOK (sv) && IN_RANGE (SvPV (sv, svlen)[0], MAGIC_LO, MAGIC_HI)) |
367 |
{ |
368 |
redo: |
369 |
|
370 |
switch (SvPVX (sv)[0]) |
371 |
{ |
372 |
case MAGIC_undef: |
373 |
if (svlen <= 1) |
374 |
XPUSHs (sv_2mortal (NEWSV (0, 0))); |
375 |
else |
376 |
{ |
377 |
if (SvPVX (sv)[1] == MAGIC_R_deref) |
378 |
deref = 1; |
379 |
else if (SvPVX (sv)[1] != MAGIC_R) |
380 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
381 |
|
382 |
sv_chop (sv, SvPVX (sv) + 2); |
383 |
|
384 |
if (!storable_mstore) |
385 |
need_storable (); |
386 |
|
387 |
PUSHMARK (SP); |
388 |
XPUSHs (sv); |
389 |
PUTBACK; |
390 |
|
391 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
392 |
croak ("Storable::mstore didn't return a single scalar"); |
393 |
|
394 |
SPAGAIN; |
395 |
|
396 |
if (deref) |
397 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
398 |
else |
399 |
SETs (sv_2mortal (newSVsv (TOPs))); |
400 |
} |
401 |
break; |
402 |
|
403 |
case MAGIC_U: |
404 |
XPUSHs (sv_2mortal (decompress_sv (sv, 0))); |
405 |
break; |
406 |
|
407 |
case MAGIC_C: |
408 |
XPUSHs (sv_2mortal (decompress_sv (sv, 1))); |
409 |
break; |
410 |
|
411 |
case MAGIC_R_deref: |
412 |
deref = 1; |
413 |
SvPVX (sv)[0] = MAGIC_R; |
414 |
goto handle_MAGIC_R; |
415 |
|
416 |
case MAGIC_CR_deref: |
417 |
deref = 1; |
418 |
case MAGIC_CR: |
419 |
sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ |
420 |
if (deref) |
421 |
if (SvPVX (sv)[0] == MAGIC_R_deref) |
422 |
SvPVX (sv)[0] = MAGIC_R; |
423 |
|
424 |
goto redo; |
425 |
|
426 |
case MAGIC_R: |
427 |
handle_MAGIC_R: |
428 |
if (!storable_mstore) |
429 |
need_storable (); |
430 |
|
431 |
PUSHMARK (SP); |
432 |
XPUSHs (sv); |
433 |
PUTBACK; |
434 |
|
435 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
436 |
croak ("Storable::mstore didn't return a single scalar"); |
437 |
|
438 |
SPAGAIN; |
439 |
|
440 |
if (deref) |
441 |
{ |
442 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
443 |
|
444 |
if (SvPVX (sv)[0] == MAGIC_R) |
445 |
SvPVX (sv)[0] = MAGIC_R_deref; |
446 |
} |
447 |
else |
448 |
SETs (sv_2mortal (newSVsv (TOPs))); |
449 |
|
450 |
break; |
451 |
|
452 |
default: |
453 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
454 |
} |
455 |
} |
456 |
else |
457 |
XPUSHs (sv_2mortal (newSVsv (sv))); |
458 |
} |
459 |
|