| 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 |
need_storable (); |
| 291 |
|
| 292 |
if (deref) |
| 293 |
sv = newRV_noinc (sv); |
| 294 |
|
| 295 |
PUSHMARK (SP); |
| 296 |
XPUSHs (sv); |
| 297 |
PUTBACK; |
| 298 |
|
| 299 |
if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) |
| 300 |
croak ("Storable::mstore didn't return a single scalar"); |
| 301 |
|
| 302 |
SPAGAIN; |
| 303 |
|
| 304 |
sv = POPs; |
| 305 |
|
| 306 |
if (SvPVX (sv)[0] == MAGIC_R) |
| 307 |
{ |
| 308 |
if (deref) |
| 309 |
SvPVX (sv)[0] = MAGIC_R_deref; |
| 310 |
} |
| 311 |
else |
| 312 |
{ |
| 313 |
char pfx[2]; |
| 314 |
|
| 315 |
pfx[0] = MAGIC_undef; |
| 316 |
pfx[1] = deref ? MAGIC_R_deref : MAGIC_R; |
| 317 |
|
| 318 |
sv_insert (sv, 0, 0, pfx, 2); |
| 319 |
} |
| 320 |
|
| 321 |
if (ix) /* compress */ |
| 322 |
sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1)); |
| 323 |
|
| 324 |
XPUSHs (sv); |
| 325 |
} |
| 326 |
else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) |
| 327 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U))); /* need to prefix only */ |
| 328 |
else if (ix == 2) /* compress always */ |
| 329 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1))); |
| 330 |
else if (SvNIOK (sv)) /* don't compress */ |
| 331 |
{ |
| 332 |
STRLEN len; |
| 333 |
char *s = SvPV (sv, len); |
| 334 |
XPUSHs (sv_2mortal (newSVpvn (s, len))); |
| 335 |
} |
| 336 |
else /* don't compress */ |
| 337 |
XPUSHs (sv_2mortal (newSVsv (sv))); |
| 338 |
|
| 339 |
void |
| 340 |
sthaw(sv) |
| 341 |
SV * sv |
| 342 |
PROTOTYPE: $ |
| 343 |
PPCODE: |
| 344 |
{ |
| 345 |
STRLEN svlen; |
| 346 |
int deref = 0; |
| 347 |
|
| 348 |
SvGETMAGIC (sv); |
| 349 |
if (SvPOK (sv) && IN_RANGE (SvPVbyte (sv, svlen)[0], MAGIC_LO, MAGIC_HI)) |
| 350 |
{ |
| 351 |
redo: |
| 352 |
|
| 353 |
switch (SvPVX (sv)[0]) |
| 354 |
{ |
| 355 |
case MAGIC_undef: |
| 356 |
if (svlen <= 1) |
| 357 |
XPUSHs (sv_2mortal (NEWSV (0, 0))); |
| 358 |
else |
| 359 |
{ |
| 360 |
if (SvPVX (sv)[1] == MAGIC_R_deref) |
| 361 |
deref = 1; |
| 362 |
else if (SvPVX (sv)[1] != MAGIC_R) |
| 363 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
| 364 |
|
| 365 |
sv_chop (sv, SvPVX (sv) + 2); |
| 366 |
|
| 367 |
if (!storable_mstore) |
| 368 |
need_storable (); |
| 369 |
|
| 370 |
PUSHMARK (SP); |
| 371 |
XPUSHs (sv); |
| 372 |
PUTBACK; |
| 373 |
|
| 374 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
| 375 |
croak ("Storable::mstore didn't return a single scalar"); |
| 376 |
|
| 377 |
SPAGAIN; |
| 378 |
|
| 379 |
if (deref) |
| 380 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
| 381 |
else |
| 382 |
SETs (sv_2mortal (newSVsv (TOPs))); |
| 383 |
} |
| 384 |
break; |
| 385 |
|
| 386 |
case MAGIC_U: |
| 387 |
XPUSHs (sv_2mortal (decompress_sv (sv, 0))); |
| 388 |
break; |
| 389 |
|
| 390 |
case MAGIC_C: |
| 391 |
XPUSHs (sv_2mortal (decompress_sv (sv, 1))); |
| 392 |
break; |
| 393 |
|
| 394 |
case MAGIC_R_deref: |
| 395 |
deref = 1; |
| 396 |
SvPVX (sv)[0] = MAGIC_R; |
| 397 |
goto handle_MAGIC_R; |
| 398 |
|
| 399 |
case MAGIC_CR_deref: |
| 400 |
deref = 1; |
| 401 |
case MAGIC_CR: |
| 402 |
sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ |
| 403 |
if (deref) |
| 404 |
if (SvPVX (sv)[0] == MAGIC_R_deref) |
| 405 |
SvPVX (sv)[0] = MAGIC_R; |
| 406 |
|
| 407 |
goto redo; |
| 408 |
|
| 409 |
case MAGIC_R: |
| 410 |
handle_MAGIC_R: |
| 411 |
if (!storable_mstore) |
| 412 |
need_storable (); |
| 413 |
|
| 414 |
PUSHMARK (SP); |
| 415 |
XPUSHs (sv); |
| 416 |
PUTBACK; |
| 417 |
|
| 418 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
| 419 |
croak ("Storable::mstore didn't return a single scalar"); |
| 420 |
|
| 421 |
SPAGAIN; |
| 422 |
|
| 423 |
if (deref) |
| 424 |
{ |
| 425 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
| 426 |
|
| 427 |
if (SvPVX (sv)[0] == MAGIC_R) |
| 428 |
SvPVX (sv)[0] = MAGIC_R_deref; |
| 429 |
} |
| 430 |
else |
| 431 |
SETs (sv_2mortal (newSVsv (TOPs))); |
| 432 |
|
| 433 |
break; |
| 434 |
|
| 435 |
default: |
| 436 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
| 437 |
} |
| 438 |
} |
| 439 |
else |
| 440 |
XPUSHs (sv_2mortal (newSVsv (sv))); |
| 441 |
} |
| 442 |
|
