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