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