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 |
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#if PATCHLEVEL < 6 |
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# define call_sv perl_call_sv |
15 |
#endif |
16 |
|
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#include "lzf_c.c" |
18 |
#include "lzf_d.c" |
19 |
|
20 |
/* we re-use the storable header for our purposes */ |
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#define MAGIC_LO 0 |
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#define MAGIC_U 0 /* uncompressed data follows */ |
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#define MAGIC_C 1 /* compressed data follows */ |
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#define MAGIC_undef 2 /* the special value undef */ |
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#define MAGIC_CR 3 /* storable (reference, freeze), compressed */ |
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#define MAGIC_R 4 /* storable (reference, freeze) */ |
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#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */ |
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#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */ |
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#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)) |
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|
33 |
static CV *storable_mstore, *storable_mretrieve; |
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|
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static SV * |
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compress_sv (SV *data, char cprepend, int uprepend) |
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{ |
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STRLEN usize, csize; |
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char *src = (char *)SvPV (data, usize); |
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|
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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; |
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|
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SvPOK_only (ret); |
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dst = (unsigned char *)SvPVX (ret); |
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|
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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; |
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} |
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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 : |
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lzf_compress (src, usize, |
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dst + skip, |
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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 < 0) |
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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++ = 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); |
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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; |
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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; |
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usize = (usize << 6) | (*src++ & 0x3f); |
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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); |
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usize = (usize << 6) | (*src++ & 0x3f); |
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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); |
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usize = (usize << 6) | (*src++ & 0x3f); |
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usize = (usize << 6) | (*src++ & 0x3f); |
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usize = (usize << 6) | (*src++ & 0x3f); |
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} |
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else |
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croak ("compressed data corrupted"); |
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|
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ret = NEWSV (0, usize); |
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SvPOK_only (ret); |
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dst = SvPVX (ret); |
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|
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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); |
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|
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Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char); |
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} |
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|
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SvCUR_set (ret, usize); |
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|
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return ret; |
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} |
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else |
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return newSVpvn ("", 0); |
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} |
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|
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static void |
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need_storable(void) |
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{ |
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#if PATCHLEVEL < 6 |
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perl_eval_pv ("require Storable;", 1); |
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#else |
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load_module (PERL_LOADMOD_NOIMPORT, newSVpv ("Storable", 0), Nullsv); |
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#endif |
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|
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storable_mstore = GvCV (gv_fetchpv ("Storable::mstore" , TRUE, SVt_PVCV)); |
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storable_mretrieve = GvCV (gv_fetchpv ("Storable::mretrieve", TRUE, SVt_PVCV)); |
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} |
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|
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MODULE = Compress::LZF PACKAGE = Compress::LZF |
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|
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void |
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compress(data) |
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SV * data |
211 |
PROTOTYPE: $ |
212 |
PPCODE: |
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XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U))); |
214 |
|
215 |
void |
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decompress(data) |
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SV * data |
218 |
PROTOTYPE: $ |
219 |
PPCODE: |
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XPUSHs (sv_2mortal (decompress_sv (data, 0))); |
221 |
|
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void |
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sfreeze(sv) |
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SV * sv |
225 |
ALIAS: |
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sfreeze_cr = 1 |
227 |
sfreeze_c = 2 |
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PROTOTYPE: $ |
229 |
PPCODE: |
230 |
|
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SvGETMAGIC (sv); |
232 |
|
233 |
if (!SvOK (sv)) |
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XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */ |
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else if (SvTYPE(sv) != SVt_IV |
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&& SvTYPE(sv) != SVt_NV |
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&& SvTYPE(sv) != SVt_PV |
238 |
&& SvTYPE(sv) != SVt_PVMG+99999) /* mstore */ |
239 |
{ |
240 |
int deref = !SvROK (sv); |
241 |
|
242 |
if (!storable_mstore) |
243 |
need_storable (); |
244 |
|
245 |
if (deref) |
246 |
sv = newRV_noinc (sv); |
247 |
|
248 |
PUSHMARK (SP); |
249 |
XPUSHs (sv); |
250 |
PUTBACK; |
251 |
|
252 |
if (1 != call_sv ((SV *)storable_mstore, G_SCALAR)) |
253 |
croak ("Storable::mstore didn't return a single scalar"); |
254 |
|
255 |
SPAGAIN; |
256 |
|
257 |
sv = POPs; |
258 |
|
259 |
if (SvPVX (sv)[0] != MAGIC_R) |
260 |
croak ("Storable format changed, need newer version of Compress::LZF"); |
261 |
|
262 |
if (deref) |
263 |
SvPVX (sv)[0] = MAGIC_R_deref; |
264 |
|
265 |
if (ix) /* compress */ |
266 |
sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1)); |
267 |
|
268 |
XPUSHs (sv); |
269 |
} |
270 |
else if (SvTYPE (sv) == SVt_PV && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI)) |
271 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U))); /* need to prefix only */ |
272 |
else if (ix == 2) /* compress always */ |
273 |
XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1))); |
274 |
else /* don't compress */ |
275 |
XPUSHs (sv_2mortal (SvREFCNT_inc (sv))); |
276 |
|
277 |
void |
278 |
sthaw(sv) |
279 |
SV * sv |
280 |
PROTOTYPE: $ |
281 |
PPCODE: |
282 |
|
283 |
int deref = 0; |
284 |
|
285 |
SvGETMAGIC (sv); |
286 |
if (SvPOK (sv) && IN_RANGE (SvPV_nolen (sv)[0], MAGIC_LO, MAGIC_HI)) |
287 |
{ |
288 |
switch (SvPVX (sv)[0]) |
289 |
{ |
290 |
case MAGIC_undef: |
291 |
XPUSHs (sv_2mortal (NEWSV (0, 0))); |
292 |
break; |
293 |
|
294 |
case MAGIC_U: |
295 |
XPUSHs (sv_2mortal (decompress_sv (sv, 0))); |
296 |
break; |
297 |
|
298 |
case MAGIC_C: |
299 |
XPUSHs (sv_2mortal (decompress_sv (sv, 1))); |
300 |
break; |
301 |
|
302 |
case MAGIC_R_deref: |
303 |
deref = 1; |
304 |
SvPVX (sv)[0] = MAGIC_R; |
305 |
goto handle_MAGIC_R; |
306 |
|
307 |
case MAGIC_CR_deref: |
308 |
deref = 1; |
309 |
case MAGIC_CR: |
310 |
sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */ |
311 |
if (deref) |
312 |
if (SvPVX (sv)[0] == MAGIC_R_deref) |
313 |
SvPVX (sv)[0] = MAGIC_R; |
314 |
else |
315 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
316 |
|
317 |
case MAGIC_R: |
318 |
handle_MAGIC_R: |
319 |
if (!storable_mstore) |
320 |
need_storable (); |
321 |
|
322 |
PUSHMARK (SP); |
323 |
XPUSHs (sv); |
324 |
PUTBACK; |
325 |
|
326 |
if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR)) |
327 |
croak ("Storable::mstore didn't return a single scalar"); |
328 |
|
329 |
SPAGAIN; |
330 |
|
331 |
if (deref) |
332 |
{ |
333 |
SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs)))); |
334 |
|
335 |
if (SvPVX (sv)[0] == MAGIC_R) |
336 |
SvPVX (sv)[0] = MAGIC_R_deref; |
337 |
} |
338 |
else |
339 |
XPUSHs (POPs); /* this is a nop, hopefully */ |
340 |
|
341 |
break; |
342 |
|
343 |
default: |
344 |
croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?"); |
345 |
} |
346 |
} |
347 |
else |
348 |
XPUSHs (sv_2mortal (newSVsv (sv))); |