| 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 |
|
| 14 |
#include "lzf_c.c" |
| 15 |
#include "lzf_d.c" |
| 16 |
|
| 17 |
/* we re-use the storable header for our purposes */ |
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#define MAGIC_LO 0 |
| 19 |
#define MAGIC_U 0 /* uncompressed data follows */ |
| 20 |
#define MAGIC_C 1 /* compressed data follows */ |
| 21 |
#define MAGIC_R 4 /* storable (reference, freeze) */ |
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#define MAGIC_CR 3 /* storable (reference, freeze), compressed */ |
| 23 |
#define MAGIC_HI 7 /* room for one higher storable major */ |
| 24 |
|
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#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l)) |
| 26 |
|
| 27 |
static CV *storable_mstore, *storable_mretrieve; |
| 28 |
|
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static SV * |
| 30 |
compress_sv (SV *data, char cprepend, char uprepend) |
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{ |
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STRLEN usize, csize; |
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char *src = (char *)SvPV (data, usize); |
| 34 |
|
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if (usize) |
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{ |
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SV *ret = NEWSV (0, usize + 1); |
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unsigned char *dst; |
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int skip = 0; |
| 40 |
|
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SvPOK_only (ret); |
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dst = (unsigned char *)SvPVX (ret); |
| 43 |
|
| 44 |
if (cprepend) |
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dst[skip++] = cprepend; |
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|
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if (usize < 0x80) |
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{ |
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dst[skip++] = usize; |
| 50 |
} |
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else if (usize < 0x800) |
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{ |
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dst[skip++] = (( usize >> 6) | 0xc0); |
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dst[skip++] = (( usize & 0x3f) | 0x80); |
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} |
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else if (usize < 0x10000) |
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{ |
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dst[skip++] = (( usize >> 12) | 0xe0); |
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dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
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dst[skip++] = (( usize & 0x3f) | 0x80); |
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} |
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else if (usize < 0x200000) |
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{ |
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dst[skip++] = (( usize >> 18) | 0xf0); |
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dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
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dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
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dst[skip++] = (( usize & 0x3f) | 0x80); |
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} |
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else if (usize < 0x4000000) |
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{ |
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dst[skip++] = (( usize >> 24) | 0xf8); |
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dst[skip++] = (((usize >> 18) & 0x3f) | 0x80); |
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dst[skip++] = (((usize >> 12) & 0x3f) | 0x80); |
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dst[skip++] = (((usize >> 6) & 0x3f) | 0x80); |
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dst[skip++] = (( usize & 0x3f) | 0x80); |
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} |
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else |
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croak ("compress can only compress up to %ld bytes", 0x4000000-1); |
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|
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/* 11 bytes is the smallest compressible string */ |
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csize = usize < 11 ? 0 : |
| 82 |
lzf_compress (src, usize, |
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dst + skip, |
| 84 |
usize - skip); |
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|
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if (csize) |
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{ |
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SvCUR_set (ret, csize + skip); |
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} |
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else if (!uprepend) |
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{ |
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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++ = 0; |
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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); |
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} |
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|
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return ret; |
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} |
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else |
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return newSVpv ("", 0); |
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} |
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|
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static SV * |
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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; |
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|
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if (csize) |
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{ |
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void *dst; |
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SV *ret; |
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|
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csize -= skip; |
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|
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if (src[0]) |
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{ |
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if (!(src[0] & 0x80)) |
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{ |
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csize -= 1; |
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usize = *src++ & 0xff; |
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} |
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else if (!(src[0] & 0x20)) |
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{ |
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csize -= 2; |
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usize = *src++ & 0x1f; |
| 134 |
usize = (usize << 6) | (*src++ & 0x3f); |
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} |
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else if (!(src[0] & 0x10)) |
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{ |
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csize -= 3; |
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usize = *src++ & 0x0f; |
| 140 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 141 |
usize = (usize << 6) | (*src++ & 0x3f); |
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} |
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else if (!(src[0] & 0x08)) |
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{ |
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csize -= 4; |
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usize = *src++ & 0x07; |
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usize = (usize << 6) | (*src++ & 0x3f); |
| 148 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 149 |
usize = (usize << 6) | (*src++ & 0x3f); |
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} |
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else if (!(src[0] & 0x04)) |
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{ |
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csize -= 5; |
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usize = *src++ & 0x03; |
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usize = (usize << 6) | (*src++ & 0x3f); |
| 156 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 157 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 158 |
usize = (usize << 6) | (*src++ & 0x3f); |
| 159 |
} |
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else |
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croak ("compressed data corrupted"); |
| 162 |
|
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ret = NEWSV (0, usize); |
| 164 |
SvPOK_only (ret); |
| 165 |
dst = SvPVX (ret); |
| 166 |
|
| 167 |
if (lzf_decompress (src, csize, dst, usize) != usize) |
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croak ("compressed data corrupted", csize, skip, usize); |
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} |
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else |
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{ |
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usize = csize - 1; |
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ret = NEWSV (0, usize); |
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SvPOK_only (ret); |
| 175 |
|
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Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char); |
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} |
| 178 |
|
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SvCUR_set (ret, usize); |
| 180 |
|
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return ret; |
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} |
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else |
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return newSVpvn ("", 0); |
| 185 |
} |
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|
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static void |
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need_storable(void) |
| 189 |
{ |
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load_module (PERL_LOADMOD_NOIMPORT, newSVpv ("Storable", 0), Nullsv); |
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|
| 192 |
storable_mstore = GvCV (gv_fetchpv ("Storable::mstore" , TRUE, SVt_PVCV)); |
| 193 |
storable_mretrieve = GvCV (gv_fetchpv ("Storable::mretrieve", TRUE, SVt_PVCV)); |
| 194 |
} |
| 195 |
|
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MODULE = Compress::LZF PACKAGE = Compress::LZF |
| 197 |
|
| 198 |
void |
| 199 |
compress(data) |
| 200 |
SV * data |
| 201 |
PROTOTYPE: $ |
| 202 |
PPCODE: |
| 203 |
XPUSHs (sv_2mortal (compress_sv (data, 0, 1))); |
| 204 |
|
| 205 |
void |
| 206 |
decompress(data) |
| 207 |
SV * data |
| 208 |
PROTOTYPE: $ |
| 209 |
PPCODE: |
| 210 |
XPUSHs (sv_2mortal (decompress_sv (data, 0))); |
| 211 |
|
| 212 |
void |
| 213 |
sfreeze(sv) |
| 214 |
SV * sv |
| 215 |
ALIAS: |
| 216 |
sfreeze_cr = 1 |
| 217 |
sfreeze_c = 2 |
| 218 |
PROTOTYPE: $ |
| 219 |
PPCODE: |
| 220 |
|
| 221 |
if (SvROK (sv)) /* mstore */ |
| 222 |
{ |
| 223 |
if (!storable_mstore) |
| 224 |
need_storable (); |
| 225 |
|
| 226 |
PUSHMARK (SP); |
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XPUSHs (sv); |
| 228 |
PUTBACK; |
| 229 |
|
| 230 |
if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) |
| 231 |
croak ("Storable::mstore didn't return a single scalar"); |
| 232 |
|
| 233 |
SPAGAIN; |
| 234 |
|
| 235 |
sv = POPs; |
| 236 |
|
| 237 |
if (SvPVX (sv)[0] != MAGIC_R) |
| 238 |
croak ("Storable format changed, need newer version of Compress::LZF"); |
| 239 |
|
| 240 |
if (ix) /* compress */ |
| 241 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_CR, 0))); |
| 242 |
else |
| 243 |
XPUSHs (sv); |
| 244 |
} |
| 245 |
else if (IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) |
| 246 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, 1))); /* need to prefix only */ |
| 247 |
else if (ix == 2) /* compress always */ |
| 248 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, 0))); |
| 249 |
else /* don't compress */ |
| 250 |
XPUSHs (sv_2mortal (SvREFCNT_inc (sv))); |
| 251 |
|
| 252 |
void |
| 253 |
sthaw(sv) |
| 254 |
SV * sv |
| 255 |
PROTOTYPE: $ |
| 256 |
PPCODE: |
| 257 |
char hdr = SvPVX (sv)[0]; |
| 258 |
|
| 259 |
if (IN_RANGE (hdr, MAGIC_LO, MAGIC_HI)) |
| 260 |
{ |
| 261 |
switch (SvPVX (sv)[0]) |
| 262 |
{ |
| 263 |
case MAGIC_U: |
| 264 |
XPUSHs (sv_2mortal (decompress_sv (sv, 0))); |
| 265 |
break; |
| 266 |
|
| 267 |
case MAGIC_C: |
| 268 |
XPUSHs (sv_2mortal (decompress_sv (sv, 1))); |
| 269 |
break; |
| 270 |
|
| 271 |
case MAGIC_CR: |
| 272 |
sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ |
| 273 |
case MAGIC_R: |
| 274 |
if (!storable_mstore) |
| 275 |
need_storable (); |
| 276 |
|
| 277 |
PUSHMARK (SP); |
| 278 |
XPUSHs (sv); |
| 279 |
PUTBACK; |
| 280 |
|
| 281 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
| 282 |
croak ("Storable::mstore didn't return a single scalar"); |
| 283 |
|
| 284 |
SPAGAIN; |
| 285 |
|
| 286 |
/*XPUSHs (POPs);*/ |
| 287 |
|
| 288 |
break; |
| 289 |
|
| 290 |
default: |
| 291 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
| 292 |
} |
| 293 |
} |
| 294 |
else |
| 295 |
XPUSHs (sv_2mortal (SvREFCNT_inc (sv))); |
