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 |
#include "lzf_c.c" |
18 |
#include "lzf_d.c" |
19 |
|
20 |
/* we re-use the storable header for our purposes */ |
21 |
#define MAGIC_LO 0 |
22 |
#define MAGIC_U 0 /* uncompressed data follows */ |
23 |
#define MAGIC_C 1 /* compressed data follows */ |
24 |
#define MAGIC_R 4 /* storable (reference, freeze) */ |
25 |
#define MAGIC_CR 3 /* storable (reference, freeze), compressed */ |
26 |
#define MAGIC_HI 7 /* room for one higher storable major */ |
27 |
|
28 |
#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l)) |
29 |
|
30 |
static CV *storable_mstore, *storable_mretrieve; |
31 |
|
32 |
static SV * |
33 |
compress_sv (SV *data, char cprepend, char uprepend) |
34 |
{ |
35 |
STRLEN usize, csize; |
36 |
char *src = (char *)SvPV (data, usize); |
37 |
|
38 |
if (usize) |
39 |
{ |
40 |
SV *ret = NEWSV (0, usize + 1); |
41 |
unsigned char *dst; |
42 |
int skip = 0; |
43 |
|
44 |
SvPOK_only (ret); |
45 |
dst = (unsigned char *)SvPVX (ret); |
46 |
|
47 |
if (cprepend) |
48 |
dst[skip++] = cprepend; |
49 |
|
50 |
if (usize < 0x80) |
51 |
{ |
52 |
dst[skip++] = usize; |
53 |
} |
54 |
else if (usize < 0x800) |
55 |
{ |
56 |
dst[skip++] = (( usize >> 6) | 0xc0); |
57 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
58 |
} |
59 |
else if (usize < 0x10000) |
60 |
{ |
61 |
dst[skip++] = (( usize >> 12) | 0xe0); |
62 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
63 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
64 |
} |
65 |
else if (usize < 0x200000) |
66 |
{ |
67 |
dst[skip++] = (( usize >> 18) | 0xf0); |
68 |
dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
69 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
70 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
71 |
} |
72 |
else if (usize < 0x4000000) |
73 |
{ |
74 |
dst[skip++] = (( usize >> 24) | 0xf8); |
75 |
dst[skip++] = (((usize >> 18) & 0x3f) | 0x80); |
76 |
dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
77 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
78 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
79 |
} |
80 |
else |
81 |
croak ("compress can only compress up to %ld bytes", 0x4000000-1); |
82 |
|
83 |
/* 11 bytes is the smallest compressible string */ |
84 |
csize = usize < 11 ? 0 : |
85 |
lzf_compress (src, usize, |
86 |
dst + skip, |
87 |
usize - skip); |
88 |
|
89 |
if (csize) |
90 |
{ |
91 |
SvCUR_set (ret, csize + skip); |
92 |
} |
93 |
else if (!uprepend) |
94 |
{ |
95 |
SvREFCNT_dec (ret); |
96 |
ret = SvREFCNT_inc (data); |
97 |
} |
98 |
else |
99 |
{ |
100 |
*dst++ = 0; |
101 |
|
102 |
Move ((void *)src, (void *)dst, usize, unsigned char); |
103 |
|
104 |
SvCUR_set (ret, usize + 1); |
105 |
} |
106 |
|
107 |
return ret; |
108 |
} |
109 |
else |
110 |
return newSVpv ("", 0); |
111 |
} |
112 |
|
113 |
static SV * |
114 |
decompress_sv (SV *data, int skip) |
115 |
{ |
116 |
STRLEN usize, csize; |
117 |
unsigned char *src = (unsigned char *)SvPV (data, csize) + skip; |
118 |
|
119 |
if (csize) |
120 |
{ |
121 |
void *dst; |
122 |
SV *ret; |
123 |
|
124 |
csize -= skip; |
125 |
|
126 |
if (src[0]) |
127 |
{ |
128 |
if (!(src[0] & 0x80)) |
129 |
{ |
130 |
csize -= 1; |
131 |
usize = *src++ & 0xff; |
132 |
} |
133 |
else if (!(src[0] & 0x20)) |
134 |
{ |
135 |
csize -= 2; |
136 |
usize = *src++ & 0x1f; |
137 |
usize = (usize << 6) | (*src++ & 0x3f); |
138 |
} |
139 |
else if (!(src[0] & 0x10)) |
140 |
{ |
141 |
csize -= 3; |
142 |
usize = *src++ & 0x0f; |
143 |
usize = (usize << 6) | (*src++ & 0x3f); |
144 |
usize = (usize << 6) | (*src++ & 0x3f); |
145 |
} |
146 |
else if (!(src[0] & 0x08)) |
147 |
{ |
148 |
csize -= 4; |
149 |
usize = *src++ & 0x07; |
150 |
usize = (usize << 6) | (*src++ & 0x3f); |
151 |
usize = (usize << 6) | (*src++ & 0x3f); |
152 |
usize = (usize << 6) | (*src++ & 0x3f); |
153 |
} |
154 |
else if (!(src[0] & 0x04)) |
155 |
{ |
156 |
csize -= 5; |
157 |
usize = *src++ & 0x03; |
158 |
usize = (usize << 6) | (*src++ & 0x3f); |
159 |
usize = (usize << 6) | (*src++ & 0x3f); |
160 |
usize = (usize << 6) | (*src++ & 0x3f); |
161 |
usize = (usize << 6) | (*src++ & 0x3f); |
162 |
} |
163 |
else |
164 |
croak ("compressed data corrupted"); |
165 |
|
166 |
ret = NEWSV (0, usize); |
167 |
SvPOK_only (ret); |
168 |
dst = SvPVX (ret); |
169 |
|
170 |
if (lzf_decompress (src, csize, dst, usize) != usize) |
171 |
croak ("compressed data corrupted", csize, skip, usize); |
172 |
} |
173 |
else |
174 |
{ |
175 |
usize = csize - 1; |
176 |
ret = NEWSV (0, usize); |
177 |
SvPOK_only (ret); |
178 |
|
179 |
Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char); |
180 |
} |
181 |
|
182 |
SvCUR_set (ret, usize); |
183 |
|
184 |
return ret; |
185 |
} |
186 |
else |
187 |
return newSVpvn ("", 0); |
188 |
} |
189 |
|
190 |
static void |
191 |
need_storable(void) |
192 |
{ |
193 |
#if PATCHLEVEL < 6 |
194 |
perl_eval_pv ("require Storable;", 1); |
195 |
#else |
196 |
load_module (PERL_LOADMOD_NOIMPORT, newSVpv ("Storable", 0), Nullsv); |
197 |
#endif |
198 |
|
199 |
storable_mstore = GvCV (gv_fetchpv ("Storable::mstore" , TRUE, SVt_PVCV)); |
200 |
storable_mretrieve = GvCV (gv_fetchpv ("Storable::mretrieve", TRUE, SVt_PVCV)); |
201 |
} |
202 |
|
203 |
MODULE = Compress::LZF PACKAGE = Compress::LZF |
204 |
|
205 |
void |
206 |
compress(data) |
207 |
SV * data |
208 |
PROTOTYPE: $ |
209 |
PPCODE: |
210 |
XPUSHs (sv_2mortal (compress_sv (data, 0, 1))); |
211 |
|
212 |
void |
213 |
decompress(data) |
214 |
SV * data |
215 |
PROTOTYPE: $ |
216 |
PPCODE: |
217 |
XPUSHs (sv_2mortal (decompress_sv (data, 0))); |
218 |
|
219 |
void |
220 |
sfreeze(sv) |
221 |
SV * sv |
222 |
ALIAS: |
223 |
sfreeze_cr = 1 |
224 |
sfreeze_c = 2 |
225 |
PROTOTYPE: $ |
226 |
PPCODE: |
227 |
|
228 |
if (SvTYPE(sv) != SVt_IV |
229 |
&& SvTYPE(sv) != SVt_NV |
230 |
&& SvTYPE(sv) != SVt_PV) /* mstore */ |
231 |
{ |
232 |
if (!storable_mstore) |
233 |
need_storable (); |
234 |
|
235 |
PUSHMARK (SP); |
236 |
XPUSHs (sv); |
237 |
PUTBACK; |
238 |
|
239 |
if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) |
240 |
croak ("Storable::mstore didn't return a single scalar"); |
241 |
|
242 |
SPAGAIN; |
243 |
|
244 |
sv = POPs; |
245 |
|
246 |
if (SvPVX (sv)[0] != MAGIC_R) |
247 |
croak ("Storable format changed, need newer version of Compress::LZF"); |
248 |
|
249 |
if (ix) /* compress */ |
250 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_CR, 0))); |
251 |
else |
252 |
XPUSHs (sv); |
253 |
} |
254 |
else if (IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) |
255 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, 1))); /* need to prefix only */ |
256 |
else if (ix == 2) /* compress always */ |
257 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, 0))); |
258 |
else /* don't compress */ |
259 |
XPUSHs (sv_2mortal (SvREFCNT_inc (sv))); |
260 |
|
261 |
void |
262 |
sthaw(sv) |
263 |
SV * sv |
264 |
PROTOTYPE: $ |
265 |
PPCODE: |
266 |
char hdr = SvPVX (sv)[0]; |
267 |
|
268 |
if (IN_RANGE (hdr, MAGIC_LO, MAGIC_HI)) |
269 |
{ |
270 |
switch (SvPVX (sv)[0]) |
271 |
{ |
272 |
case MAGIC_U: |
273 |
XPUSHs (sv_2mortal (decompress_sv (sv, 0))); |
274 |
break; |
275 |
|
276 |
case MAGIC_C: |
277 |
XPUSHs (sv_2mortal (decompress_sv (sv, 1))); |
278 |
break; |
279 |
|
280 |
case MAGIC_CR: |
281 |
sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ |
282 |
case MAGIC_R: |
283 |
if (!storable_mstore) |
284 |
need_storable (); |
285 |
|
286 |
PUSHMARK (SP); |
287 |
XPUSHs (sv); |
288 |
PUTBACK; |
289 |
|
290 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
291 |
croak ("Storable::mstore didn't return a single scalar"); |
292 |
|
293 |
SPAGAIN; |
294 |
|
295 |
/*XPUSHs (POPs);*/ |
296 |
|
297 |
break; |
298 |
|
299 |
default: |
300 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
301 |
} |
302 |
} |
303 |
else |
304 |
XPUSHs (sv_2mortal (SvREFCNT_inc (sv))); |