| 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_undef 2 /* the special value undef */ |
| 25 |
#define MAGIC_CR 3 /* storable (reference, freeze), compressed */ |
| 26 |
#define MAGIC_R 4 /* storable (reference, freeze) */ |
| 27 |
#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */ |
| 28 |
#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */ |
| 29 |
#define MAGIC_HI 7 /* room for one higher storable major */ |
| 30 |
|
| 31 |
#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l)) |
| 32 |
|
| 33 |
static CV *storable_mstore, *storable_mretrieve; |
| 34 |
|
| 35 |
static SV * |
| 36 |
compress_sv (SV *data, char cprepend, int uprepend) |
| 37 |
{ |
| 38 |
STRLEN usize, csize; |
| 39 |
char *src = (char *)SvPV (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 < 0x80) |
| 54 |
{ |
| 55 |
dst[skip++] = usize; |
| 56 |
} |
| 57 |
else if (usize < 0x800) |
| 58 |
{ |
| 59 |
dst[skip++] = (( usize >> 6) | 0xc0); |
| 60 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
| 61 |
} |
| 62 |
else if (usize < 0x10000) |
| 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 < 0x200000) |
| 69 |
{ |
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dst[skip++] = (( usize >> 18) | 0xf0); |
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dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
| 72 |
dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
| 73 |
dst[skip++] = (( usize & 0x3f) | 0x80); |
| 74 |
} |
| 75 |
else if (usize < 0x4000000) |
| 76 |
{ |
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dst[skip++] = (( usize >> 24) | 0xf8); |
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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 |
| 84 |
croak ("compress can only compress up to %ld bytes", 0x4000000-1); |
| 85 |
|
| 86 |
/* 11 bytes is the smallest compressible string */ |
| 87 |
csize = usize < 11 ? 0 : |
| 88 |
lzf_compress (src, usize, |
| 89 |
dst + skip, |
| 90 |
usize - skip); |
| 91 |
|
| 92 |
if (csize) |
| 93 |
{ |
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SvCUR_set (ret, csize + skip); |
| 95 |
} |
| 96 |
else if (uprepend < 0) |
| 97 |
{ |
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SvREFCNT_dec (ret); |
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ret = SvREFCNT_inc (data); |
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} |
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else |
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{ |
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*dst++ = uprepend; |
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|
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Move ((void *)src, (void *)dst, usize, unsigned char); |
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|
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SvCUR_set (ret, usize + 1); |
| 108 |
} |
| 109 |
|
| 110 |
return ret; |
| 111 |
} |
| 112 |
else |
| 113 |
return newSVpv ("", 0); |
| 114 |
} |
| 115 |
|
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static SV * |
| 117 |
decompress_sv (SV *data, int skip) |
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{ |
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STRLEN usize, csize; |
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unsigned char *src = (unsigned char *)SvPV (data, csize) + skip; |
| 121 |
|
| 122 |
if (csize) |
| 123 |
{ |
| 124 |
void *dst; |
| 125 |
SV *ret; |
| 126 |
|
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csize -= skip; |
| 128 |
|
| 129 |
if (src[0]) |
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{ |
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if (!(src[0] & 0x80)) |
| 132 |
{ |
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csize -= 1; |
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usize = *src++ & 0xff; |
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} |
| 136 |
else if (!(src[0] & 0x20)) |
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{ |
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csize -= 2; |
| 139 |
usize = *src++ & 0x1f; |
| 140 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 141 |
} |
| 142 |
else if (!(src[0] & 0x10)) |
| 143 |
{ |
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csize -= 3; |
| 145 |
usize = *src++ & 0x0f; |
| 146 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 147 |
usize = (usize << 6) | (*src++ & 0x3f); |
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} |
| 149 |
else if (!(src[0] & 0x08)) |
| 150 |
{ |
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csize -= 4; |
| 152 |
usize = *src++ & 0x07; |
| 153 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 154 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 155 |
usize = (usize << 6) | (*src++ & 0x3f); |
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} |
| 157 |
else if (!(src[0] & 0x04)) |
| 158 |
{ |
| 159 |
csize -= 5; |
| 160 |
usize = *src++ & 0x03; |
| 161 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 162 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 163 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 164 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 165 |
} |
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else |
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croak ("compressed data corrupted (invalid length)"); |
| 168 |
|
| 169 |
ret = NEWSV (0, usize); |
| 170 |
SvPOK_only (ret); |
| 171 |
dst = SvPVX (ret); |
| 172 |
|
| 173 |
if (lzf_decompress (src, csize, dst, usize) != usize) |
| 174 |
croak ("compressed data corrupted (size mismatch)", csize, skip, usize); |
| 175 |
} |
| 176 |
else |
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{ |
| 178 |
usize = csize - 1; |
| 179 |
ret = NEWSV (0, usize); |
| 180 |
SvPOK_only (ret); |
| 181 |
|
| 182 |
Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char); |
| 183 |
} |
| 184 |
|
| 185 |
SvCUR_set (ret, usize); |
| 186 |
|
| 187 |
return ret; |
| 188 |
} |
| 189 |
else |
| 190 |
return newSVpvn ("", 0); |
| 191 |
} |
| 192 |
|
| 193 |
static void |
| 194 |
need_storable(void) |
| 195 |
{ |
| 196 |
#if PATCHLEVEL < 6 |
| 197 |
perl_eval_pv ("require Storable;", 1); |
| 198 |
#else |
| 199 |
load_module (PERL_LOADMOD_NOIMPORT, newSVpv ("Storable", 0), Nullsv); |
| 200 |
#endif |
| 201 |
|
| 202 |
storable_mstore = GvCV (gv_fetchpv ("Storable::mstore" , TRUE, SVt_PVCV)); |
| 203 |
storable_mretrieve = GvCV (gv_fetchpv ("Storable::mretrieve", TRUE, SVt_PVCV)); |
| 204 |
} |
| 205 |
|
| 206 |
MODULE = Compress::LZF PACKAGE = Compress::LZF |
| 207 |
|
| 208 |
void |
| 209 |
compress(data) |
| 210 |
SV * data |
| 211 |
PROTOTYPE: $ |
| 212 |
PPCODE: |
| 213 |
XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U))); |
| 214 |
|
| 215 |
void |
| 216 |
decompress(data) |
| 217 |
SV * data |
| 218 |
PROTOTYPE: $ |
| 219 |
PPCODE: |
| 220 |
XPUSHs (sv_2mortal (decompress_sv (data, 0))); |
| 221 |
|
| 222 |
void |
| 223 |
sfreeze(sv) |
| 224 |
SV * sv |
| 225 |
ALIAS: |
| 226 |
sfreeze_cr = 1 |
| 227 |
sfreeze_c = 2 |
| 228 |
PROTOTYPE: $ |
| 229 |
PPCODE: |
| 230 |
|
| 231 |
SvGETMAGIC (sv); |
| 232 |
|
| 233 |
if (!SvOK (sv)) |
| 234 |
XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */ |
| 235 |
else if (SvROK (sv) |
| 236 |
|| (SvTYPE(sv) != SVt_IV |
| 237 |
&& SvTYPE(sv) != SVt_NV |
| 238 |
&& SvTYPE(sv) != SVt_PV |
| 239 |
&& SvTYPE(sv) != SVt_PVMG)) /* mstore */ |
| 240 |
{ |
| 241 |
int deref = !SvROK (sv); |
| 242 |
|
| 243 |
if (!storable_mstore) |
| 244 |
need_storable (); |
| 245 |
|
| 246 |
if (deref) |
| 247 |
sv = newRV_noinc (sv); |
| 248 |
|
| 249 |
PUSHMARK (SP); |
| 250 |
XPUSHs (sv); |
| 251 |
PUTBACK; |
| 252 |
|
| 253 |
if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) |
| 254 |
croak ("Storable::mstore didn't return a single scalar"); |
| 255 |
|
| 256 |
SPAGAIN; |
| 257 |
|
| 258 |
sv = POPs; |
| 259 |
|
| 260 |
if (SvPVX (sv)[0] != MAGIC_R) |
| 261 |
croak ("Storable format changed, need newer version of Compress::LZF"); |
| 262 |
|
| 263 |
if (deref) |
| 264 |
SvPVX (sv)[0] = MAGIC_R_deref; |
| 265 |
|
| 266 |
if (ix) /* compress */ |
| 267 |
sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1)); |
| 268 |
|
| 269 |
XPUSHs (sv); |
| 270 |
} |
| 271 |
else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) |
| 272 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U))); /* need to prefix only */ |
| 273 |
else if (ix == 2) /* compress always */ |
| 274 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1))); |
| 275 |
else /* don't compress */ |
| 276 |
XPUSHs (sv_2mortal (SvREFCNT_inc (sv))); |
| 277 |
|
| 278 |
void |
| 279 |
sthaw(sv) |
| 280 |
SV * sv |
| 281 |
PROTOTYPE: $ |
| 282 |
PPCODE: |
| 283 |
|
| 284 |
int deref = 0; |
| 285 |
|
| 286 |
SvGETMAGIC (sv); |
| 287 |
if (SvPOK (sv) && IN_RANGE (SvPV_nolen (sv)[0], MAGIC_LO, MAGIC_HI)) |
| 288 |
{ |
| 289 |
switch (SvPVX (sv)[0]) |
| 290 |
{ |
| 291 |
case MAGIC_undef: |
| 292 |
XPUSHs (sv_2mortal (NEWSV (0, 0))); |
| 293 |
break; |
| 294 |
|
| 295 |
case MAGIC_U: |
| 296 |
XPUSHs (sv_2mortal (decompress_sv (sv, 0))); |
| 297 |
break; |
| 298 |
|
| 299 |
case MAGIC_C: |
| 300 |
XPUSHs (sv_2mortal (decompress_sv (sv, 1))); |
| 301 |
break; |
| 302 |
|
| 303 |
case MAGIC_R_deref: |
| 304 |
deref = 1; |
| 305 |
SvPVX (sv)[0] = MAGIC_R; |
| 306 |
goto handle_MAGIC_R; |
| 307 |
|
| 308 |
case MAGIC_CR_deref: |
| 309 |
deref = 1; |
| 310 |
case MAGIC_CR: |
| 311 |
sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ |
| 312 |
if (deref) |
| 313 |
if (SvPVX (sv)[0] == MAGIC_R_deref) |
| 314 |
SvPVX (sv)[0] = MAGIC_R; |
| 315 |
else |
| 316 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
| 317 |
|
| 318 |
case MAGIC_R: |
| 319 |
handle_MAGIC_R: |
| 320 |
if (!storable_mstore) |
| 321 |
need_storable (); |
| 322 |
|
| 323 |
PUSHMARK (SP); |
| 324 |
XPUSHs (sv); |
| 325 |
PUTBACK; |
| 326 |
|
| 327 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
| 328 |
croak ("Storable::mstore didn't return a single scalar"); |
| 329 |
|
| 330 |
SPAGAIN; |
| 331 |
|
| 332 |
if (deref) |
| 333 |
{ |
| 334 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
| 335 |
|
| 336 |
if (SvPVX (sv)[0] == MAGIC_R) |
| 337 |
SvPVX (sv)[0] = MAGIC_R_deref; |
| 338 |
} |
| 339 |
else |
| 340 |
XPUSHs (POPs); /* this is a nop, hopefully */ |
| 341 |
|
| 342 |
break; |
| 343 |
|
| 344 |
default: |
| 345 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
| 346 |
} |
| 347 |
} |
| 348 |
else |
| 349 |
XPUSHs (sv_2mortal (newSVsv (sv))); |
