Compress-LZF/LZF.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#define LZF_STANDALONE 1
#define LZF_STATE_ARG 1

#include "lzf_c.c"
#include "lzf_d.c"
#include "lzf_c_best.c"

/* we re-use the storable header for our purposes */
#define MAGIC_LO        0
#define MAGIC_U         0 /* uncompressed data follows */
#define MAGIC_C         1 /* compressed data follows */
#define MAGIC_undef     2 /* the special value undef */
#define MAGIC_CR        3 /* storable (reference, freeze), compressed */
#define MAGIC_R         4 /* storable (reference, freeze) */
#define MAGIC_CR_deref  5 /* storable (NO reference, freeze), compressed */
#define MAGIC_R_deref   6 /* storable (NO reference, freeze) */
#define MAGIC_HI        7 /* room for one higher storable major */
/* for historical reasons, MAGIC_undef + MAGIC_R and MAGIC_undef + MAGIC_R_deref are used, too */

#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l))

static SV *serializer_package, *serializer_mstore, *serializer_mretrieve;
static CV *storable_mstore, *storable_mretrieve;

#if Size_t_size > 4
# define MAX_LENGTH ((Size_t)0x80000000L)
#else
# define MAX_LENGTH ((Size_t) 0x8000000L)
#endif

static SV *
compress_sv (SV *data, char cprepend, int uprepend, int best)
{
  LZF_STATE *state;
  STRLEN usize, csize;
  char *src = (char *)SvPVbyte (data, usize);

  if (usize)
    {
      SV *ret = NEWSV (0, usize + 1);
      unsigned char *dst;
      int skip = 0;

      SvPOK_only (ret);
      dst = (unsigned char *)SvPVX (ret);

      if (cprepend)
        dst[skip++] = cprepend;

      if (usize <= 0x7f)
        {
          dst[skip++] = usize;
        }
      else if (usize <= 0x7ff)
        {
          dst[skip++] = (( usize >>  6)         | 0xc0);
          dst[skip++] = (( usize        & 0x3f) | 0x80);
        }
      else if (usize <= 0xffff) 
        {
          dst[skip++] = (( usize >> 12)         | 0xe0);
          dst[skip++] = (((usize >>  6) & 0x3f) | 0x80);
          dst[skip++] = (( usize        & 0x3f) | 0x80);
        }
      else if (usize <= 0x1fffff) 
        {
          dst[skip++] = (( usize >> 18)         | 0xf0);
          dst[skip++] = (((usize >> 12) & 0x3f) | 0x80);
          dst[skip++] = (((usize >>  6) & 0x3f) | 0x80);
          dst[skip++] = (( usize        & 0x3f) | 0x80);
        }
      else if (usize <= 0x3ffffff) 
        {
          dst[skip++] = (( usize >> 24)         | 0xf8);
          dst[skip++] = (((usize >> 18) & 0x3f) | 0x80);
          dst[skip++] = (((usize >> 12) & 0x3f) | 0x80);
          dst[skip++] = (((usize >>  6) & 0x3f) | 0x80);
          dst[skip++] = (( usize        & 0x3f) | 0x80);
        }
      else if (usize <= 0x7fffffff) 
        {
          dst[skip++] = (( usize >> 30)         | 0xfc);
          dst[skip++] = (((usize >> 24) & 0x3f) | 0x80);
          dst[skip++] = (((usize >> 18) & 0x3f) | 0x80);
          dst[skip++] = (((usize >> 12) & 0x3f) | 0x80);
          dst[skip++] = (((usize >>  6) & 0x3f) | 0x80);
          dst[skip++] = (( usize        & 0x3f) | 0x80);
        }
      else
        croak ("compress can only compress up to %ld bytes", 0x7fffffffL);

      New (0, state, 1, LZF_STATE);
      if (!state)
        croak ("Compress::LZF unable to allocate memory for compression state");

      /* 11 bytes is the smallest compressible string */
      csize = usize < 11 ? 0 :
              (best ? lzf_compress_best (src, usize, dst + skip, usize - skip)
                    : lzf_compress (src, usize, dst + skip, usize - skip, *state));

      Safefree (state);

      if (csize)
        {
          SvCUR_set (ret, csize + skip);
        }
      else if (uprepend < 0)
        {
          SvREFCNT_dec (ret);
          ret = SvREFCNT_inc (data);
        }
      else
        {
          *dst++ = uprepend;

          Move ((void *)src, (void *)dst, usize, unsigned char);

          SvCUR_set (ret, usize + 1);
        }

      return ret;
    }
  else
    return newSVpv ("", 0);
}

static SV *
decompress_sv (SV *data, int skip)
{
  STRLEN usize, csize;
  unsigned char *src = (unsigned char *)SvPVbyte (data, csize) + skip;

  if (csize)
    {
      void *dst;
      SV *ret;

      csize -= skip;

      if (src[0])
        {
          if (!(src[0] & 0x80) && csize >= 1)
            {
              csize -= 1;
              usize =                 *src++ & 0xff;
            }
          else if (!(src[0] & 0x20) && csize >= 2)
            {
              csize -= 2;
              usize =                 *src++ & 0x1f;
              usize = (usize << 6) | (*src++ & 0x3f);
            }
          else if (!(src[0] & 0x10) && csize >= 3)
            {
              csize -= 3;
              usize =                 *src++ & 0x0f;
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
            }
          else if (!(src[0] & 0x08) && csize >= 4)
            {
              csize -= 4;
              usize =                 *src++ & 0x07;
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
            }
          else if (!(src[0] & 0x04) && csize >= 5)
            {
              csize -= 5;
              usize =                 *src++ & 0x03;
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
            }
          else if (!(src[0] & 0x02) && csize >= 6)
            {
              csize -= 6;
              usize =                 *src++ & 0x01;
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
              usize = (usize << 6) | (*src++ & 0x3f);
            }
          else
            croak ("compressed data corrupted (invalid length)");

          if (!usize)
            croak ("compressed data corrupted (invalid length)");
                    
          ret = NEWSV (0, usize);
          SvPOK_only (ret);
          dst = SvPVX (ret);

          if (lzf_decompress (src, csize, dst, usize) != usize)
            {
              SvREFCNT_dec (ret);
              croak ("compressed data corrupted (size mismatch)", csize, skip, usize);
            }
        }
      else
        {
          usize = csize - 1;
          ret = NEWSV (0, usize | 1);
          SvPOK_only (ret);

          Move ((void *)(src + 1), (void *)SvPVX (ret), usize, unsigned char);
      }

      SvCUR_set (ret, usize);

      return ret;
    }
  else
    return newSVpvn ("", 0);
}

static void
need_storable (void)
{
  eval_sv (sv_2mortal (newSVpvf ("require %s", SvPVbyte_nolen (serializer_package))), G_VOID | G_DISCARD);

  storable_mstore    = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mstore   ), TRUE, SVt_PVCV)));
  storable_mretrieve = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mretrieve), TRUE, SVt_PVCV)));
}

MODULE = Compress::LZF   PACKAGE = Compress::LZF

BOOT:
        serializer_package   = newSVpv ("Storable", 0);
        serializer_mstore    = newSVpv ("Storable::net_mstore", 0);
        serializer_mretrieve = newSVpv ("Storable::mretrieve", 0);

void
set_serializer(package, mstore, mretrieve)
        SV *    package
        SV *    mstore
        SV *    mretrieve
        PROTOTYPE: $$$
        PPCODE:
        SvSetSV (serializer_package  , package  );
        SvSetSV (serializer_mstore   , mstore   );
        SvSetSV (serializer_mretrieve, mretrieve);
        SvREFCNT_dec (storable_mstore   ); storable_mstore    = 0;
        SvREFCNT_dec (storable_mretrieve); storable_mretrieve = 0;

void
compress(data)
        SV *    data
        ALIAS:
        compress_best = 1
        PROTOTYPE: $
        PPCODE:
        XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U, ix)));

void
decompress(data)
        SV *    data
        PROTOTYPE: $
        PPCODE:
        XPUSHs (sv_2mortal (decompress_sv (data, 0)));

void
sfreeze(sv)
        SV *    sv
        ALIAS:
        sfreeze         = 0
        sfreeze_cr      = 1
        sfreeze_c       = 2
        sfreeze_best    = 4
        sfreeze_cr_best = 5
        sfreeze_c_best  = 6
        PROTOTYPE: $
        PPCODE:
{
        int best = ix & 4;
        ix &= 3;

        SvGETMAGIC (sv);

        if (!SvOK (sv))
          XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */
        else if (SvROK (sv)
                 || SvUTF8 (sv)
                 || (SvTYPE(sv) != SVt_IV
                     && SvTYPE(sv) != SVt_NV
                     && SvTYPE(sv) != SVt_PV
                     && SvTYPE(sv) != SVt_PVIV
                     && SvTYPE(sv) != SVt_PVNV
                     && SvTYPE(sv) != SVt_PVMG)) /* mstore */
          {
            int deref = !SvROK (sv);
            char *pv;

            if (!storable_mstore)
              {
                PUTBACK;
                need_storable ();
                SPAGAIN;
              }

            if (deref)
              sv = newRV_noinc (sv);

            PUSHMARK (SP);
            XPUSHs (sv);
            PUTBACK;

            if (1 != call_sv ((SV *)storable_mstore, G_SCALAR))
              croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mstore));

            SPAGAIN;

            sv = POPs;
            pv = SvPV_nolen (sv);

            if (*pv == MAGIC_R)
              {
                if (deref)
                  *pv = MAGIC_R_deref;
              }
            else
              {
                char pfx[2];

                pfx[0] = MAGIC_undef;
                pfx[1] = deref ? MAGIC_R_deref : MAGIC_R;

                sv_insert (sv, 0, 0, pfx, 2);
              }

            if (ix) /* compress */
              sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1, best));

            XPUSHs (sv);
          }
        else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI))
          XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U, best))); /* need to prefix only */
        else if (ix == 2) /* compress always */
          XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1, best)));
        else if (SvNIOK (sv)) /* don't compress */
          {
            STRLEN len;
            char *s = SvPV (sv, len);
            XPUSHs (sv_2mortal (newSVpvn (s, len)));
          }
        else /* don't compress */
          XPUSHs (sv_2mortal (newSVsv (sv)));
}

void
sthaw(sv)
        SV *    sv
        PROTOTYPE: $
        PPCODE:
{
        STRLEN svlen;
        int deref = 0;

        SvGETMAGIC (sv);
        if (SvPOK (sv) && IN_RANGE (SvPVbyte (sv, svlen)[0], MAGIC_LO, MAGIC_HI))
          {
            redo:

            switch (SvPVX (sv)[0])
              {
                case MAGIC_undef:
                  if (svlen <= 1)
                    XPUSHs (sv_2mortal (NEWSV (0, 0)));
                  else
                    {
                      if (SvPVX (sv)[1] == MAGIC_R_deref)
                        deref = 1;
                      else if (SvPVX (sv)[1] != MAGIC_R)
                        croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");

                      sv_chop (sv, SvPVX (sv) + 2);

                      if (!storable_mstore)
                        {
                          PUTBACK;
                          need_storable ();
                          SPAGAIN;
                        }

                      PUSHMARK (SP);
                      XPUSHs (sv);
                      PUTBACK;

                      if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
                        croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));

                      SPAGAIN;

                      if (deref)
                        SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));
                      else
                        SETs (sv_2mortal (newSVsv (TOPs)));
                    }
                  break;

                case MAGIC_U:
                  XPUSHs (sv_2mortal (decompress_sv (sv, 0)));
                  break;

                case MAGIC_C:
                  XPUSHs (sv_2mortal (decompress_sv (sv, 1)));
                  break;

                case MAGIC_R_deref:
                  deref = 1;
                  SvPVX (sv)[0] = MAGIC_R;
                  goto handle_MAGIC_R;

                case MAGIC_CR_deref:
                  deref = 1;
                case MAGIC_CR:
                  sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */
                  if (deref)
                    if (SvPVX (sv)[0] == MAGIC_R_deref)
                      SvPVX (sv)[0] = MAGIC_R;

                  goto redo;

                case MAGIC_R:
                handle_MAGIC_R:
                  if (!storable_mstore)
                    {
                      PUTBACK;
                      need_storable ();
                      SPAGAIN;
                    }

                  PUSHMARK (SP);
                  XPUSHs (sv);
                  PUTBACK;

                  if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
                    croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));

                  SPAGAIN;

                  if (deref)
                    {
                      SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));

                      if (SvPVX (sv)[0] == MAGIC_R)
                        SvPVX (sv)[0] = MAGIC_R_deref;
                    }
                  else
                    SETs (sv_2mortal (newSVsv (TOPs)));

                  break; 

                default:
                  croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
              }
          }
        else
          XPUSHs (sv_2mortal (newSVsv (sv)));
}

Revision:	1.31
Committed:	Sun Aug 25 18:13:26 2013 UTC (10 years, 8 months ago) by root
Branch:	MAIN
CVS Tags:	rel-3_7
Changes since 1.30:	+21 -9 lines
Log Message:	3.7
#	User	Rev	Content
1	root	1.1	#include "EXTERN.h"
2			#include "perl.h"
3			#include "XSUB.h"
4
5	root	1.23	#define LZF_STANDALONE 1
6			#define LZF_STATE_ARG 1
7
8	root	1.1	#include "lzf_c.c"
9			#include "lzf_d.c"
10	root	1.31	#include "lzf_c_best.c"
11	root	1.1
12			/* we re-use the storable header for our purposes */
13			#define MAGIC_LO 0
14			#define MAGIC_U 0 /* uncompressed data follows */
15			#define MAGIC_C 1 /* compressed data follows */
16	root	1.4	#define MAGIC_undef 2 /* the special value undef */
17			#define MAGIC_CR 3 /* storable (reference, freeze), compressed */
18	root	1.1	#define MAGIC_R 4 /* storable (reference, freeze) */
19	root	1.9	#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */
20	root	1.10	#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */
21	root	1.1	#define MAGIC_HI 7 /* room for one higher storable major */
22	root	1.20	/* for historical reasons, MAGIC_undef + MAGIC_R and MAGIC_undef + MAGIC_R_deref are used, too */
23	root	1.1
24			#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l))
25
26	root	1.14	static SV serializer_package, serializer_mstore, *serializer_mretrieve;
27	root	1.1	static CV storable_mstore, storable_mretrieve;
28
29	root	1.20	#if Size_t_size > 4
30			# define MAX_LENGTH ((Size_t)0x80000000L)
31			#else
32			# define MAX_LENGTH ((Size_t) 0x8000000L)
33			#endif
34
35	root	1.1	static SV *
36	root	1.31	compress_sv (SV *data, char cprepend, int uprepend, int best)
37	root	1.1	{
38	root	1.23	LZF_STATE *state;
39	root	1.1	STRLEN usize, csize;
40	root	1.24	char src = (char )SvPVbyte (data, usize);
41	root	1.1
42			if (usize)
43			{
44			SV *ret = NEWSV (0, usize + 1);
45			unsigned char *dst;
46			int skip = 0;
47
48			SvPOK_only (ret);
49			dst = (unsigned char *)SvPVX (ret);
50
51			if (cprepend)
52			dst[skip++] = cprepend;
53
54	root	1.20	if (usize <= 0x7f)
55	root	1.1	{
56			dst[skip++] = usize;
57			}
58	root	1.31	else if (usize <= 0x7ff)
59	root	1.1	{
60			dst[skip++] = (( usize >> 6) \| 0xc0);
61			dst[skip++] = (( usize & 0x3f) \| 0x80);
62			}
63	root	1.20	else if (usize <= 0xffff)
64	root	1.1	{
65			dst[skip++] = (( usize >> 12) \| 0xe0);
66			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
67			dst[skip++] = (( usize & 0x3f) \| 0x80);
68			}
69	root	1.20	else if (usize <= 0x1fffff)
70	root	1.1	{
71			dst[skip++] = (( usize >> 18) \| 0xf0);
72			dst[skip++] = (((usize >> 12) & 0x3f) \| 0x80);
73			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
74			dst[skip++] = (( usize & 0x3f) \| 0x80);
75			}
76	root	1.20	else if (usize <= 0x3ffffff)
77	root	1.1	{
78			dst[skip++] = (( usize >> 24) \| 0xf8);
79			dst[skip++] = (((usize >> 18) & 0x3f) \| 0x80);
80			dst[skip++] = (((usize >> 12) & 0x3f) \| 0x80);
81			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
82			dst[skip++] = (( usize & 0x3f) \| 0x80);
83			}
84	root	1.20	else if (usize <= 0x7fffffff)
85			{
86			dst[skip++] = (( usize >> 30) \| 0xfc);
87			dst[skip++] = (((usize >> 24) & 0x3f) \| 0x80);
88			dst[skip++] = (((usize >> 18) & 0x3f) \| 0x80);
89			dst[skip++] = (((usize >> 12) & 0x3f) \| 0x80);
90			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
91			dst[skip++] = (( usize & 0x3f) \| 0x80);
92			}
93	root	1.1	else
94	root	1.20	croak ("compress can only compress up to %ld bytes", 0x7fffffffL);
95	root	1.1
96	root	1.23	New (0, state, 1, LZF_STATE);
97			if (!state)
98			croak ("Compress::LZF unable to allocate memory for compression state");
99
100	root	1.1	/* 11 bytes is the smallest compressible string */
101			csize = usize < 11 ? 0 :
102	root	1.31	(best ? lzf_compress_best (src, usize, dst + skip, usize - skip)
103			: lzf_compress (src, usize, dst + skip, usize - skip, *state));
104	root	1.23
105			Safefree (state);
106	root	1.1
107			if (csize)
108			{
109			SvCUR_set (ret, csize + skip);
110			}
111	root	1.10	else if (uprepend < 0)
112	root	1.1	{
113			SvREFCNT_dec (ret);
114			ret = SvREFCNT_inc (data);
115			}
116			else
117			{
118	root	1.10	*dst++ = uprepend;
119	root	1.1
120			Move ((void )src, (void )dst, usize, unsigned char);
121
122			SvCUR_set (ret, usize + 1);
123			}
124
125			return ret;
126			}
127			else
128			return newSVpv ("", 0);
129			}
130
131			static SV *
132			decompress_sv (SV *data, int skip)
133			{
134			STRLEN usize, csize;
135	root	1.24	unsigned char src = (unsigned char )SvPVbyte (data, csize) + skip;
136	root	1.1
137			if (csize)
138			{
139			void *dst;
140			SV *ret;
141
142			csize -= skip;
143
144			if (src[0])
145			{
146	root	1.21	if (!(src[0] & 0x80) && csize >= 1)
147	root	1.1	{
148			csize -= 1;
149			usize = *src++ & 0xff;
150			}
151	root	1.21	else if (!(src[0] & 0x20) && csize >= 2)
152	root	1.1	{
153			csize -= 2;
154			usize = *src++ & 0x1f;
155			usize = (usize << 6) \| (*src++ & 0x3f);
156			}
157	root	1.21	else if (!(src[0] & 0x10) && csize >= 3)
158	root	1.1	{
159			csize -= 3;
160			usize = *src++ & 0x0f;
161			usize = (usize << 6) \| (*src++ & 0x3f);
162			usize = (usize << 6) \| (*src++ & 0x3f);
163			}
164	root	1.21	else if (!(src[0] & 0x08) && csize >= 4)
165	root	1.1	{
166			csize -= 4;
167			usize = *src++ & 0x07;
168			usize = (usize << 6) \| (*src++ & 0x3f);
169			usize = (usize << 6) \| (*src++ & 0x3f);
170			usize = (usize << 6) \| (*src++ & 0x3f);
171			}
172	root	1.21	else if (!(src[0] & 0x04) && csize >= 5)
173	root	1.1	{
174			csize -= 5;
175			usize = *src++ & 0x03;
176			usize = (usize << 6) \| (*src++ & 0x3f);
177			usize = (usize << 6) \| (*src++ & 0x3f);
178			usize = (usize << 6) \| (*src++ & 0x3f);
179			usize = (usize << 6) \| (*src++ & 0x3f);
180			}
181	root	1.21	else if (!(src[0] & 0x02) && csize >= 6)
182	root	1.20	{
183			csize -= 6;
184			usize = *src++ & 0x01;
185			usize = (usize << 6) \| (*src++ & 0x3f);
186			usize = (usize << 6) \| (*src++ & 0x3f);
187			usize = (usize << 6) \| (*src++ & 0x3f);
188			usize = (usize << 6) \| (*src++ & 0x3f);
189			usize = (usize << 6) \| (*src++ & 0x3f);
190			}
191	root	1.1	else
192	root	1.13	croak ("compressed data corrupted (invalid length)");
193	root	1.21
194			if (!usize)
195			croak ("compressed data corrupted (invalid length)");
196	root	1.1
197			ret = NEWSV (0, usize);
198			SvPOK_only (ret);
199			dst = SvPVX (ret);
200
201			if (lzf_decompress (src, csize, dst, usize) != usize)
202	root	1.22	{
203			SvREFCNT_dec (ret);
204			croak ("compressed data corrupted (size mismatch)", csize, skip, usize);
205			}
206	root	1.1	}
207			else
208			{
209			usize = csize - 1;
210	root	1.21	ret = NEWSV (0, usize \| 1);
211	root	1.1	SvPOK_only (ret);
212
213			Move ((void )(src + 1), (void )SvPVX (ret), usize, unsigned char);
214			}
215
216			SvCUR_set (ret, usize);
217
218			return ret;
219			}
220			else
221			return newSVpvn ("", 0);
222			}
223
224			static void
225	root	1.27	need_storable (void)
226	root	1.1	{
227	root	1.30	eval_sv (sv_2mortal (newSVpvf ("require %s", SvPVbyte_nolen (serializer_package))), G_VOID \| G_DISCARD);
228	root	1.1
229	root	1.27	storable_mstore = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mstore ), TRUE, SVt_PVCV)));
230			storable_mretrieve = (CV *)SvREFCNT_inc (GvCV (gv_fetchpv (SvPVbyte_nolen (serializer_mretrieve), TRUE, SVt_PVCV)));
231	root	1.1	}
232
233			MODULE = Compress::LZF PACKAGE = Compress::LZF
234	root	1.14
235			BOOT:
236			serializer_package = newSVpv ("Storable", 0);
237	root	1.20	serializer_mstore = newSVpv ("Storable::net_mstore", 0);
238	root	1.14	serializer_mretrieve = newSVpv ("Storable::mretrieve", 0);
239
240			void
241			set_serializer(package, mstore, mretrieve)
242			SV * package
243			SV * mstore
244			SV * mretrieve
245			PROTOTYPE: $$$
246			PPCODE:
247			SvSetSV (serializer_package , package );
248			SvSetSV (serializer_mstore , mstore );
249			SvSetSV (serializer_mretrieve, mretrieve);
250	root	1.27	SvREFCNT_dec (storable_mstore ); storable_mstore = 0;
251			SvREFCNT_dec (storable_mretrieve); storable_mretrieve = 0;
252	root	1.1
253			void
254			compress(data)
255			SV * data
256	root	1.31	ALIAS:
257			compress_best = 1
258	root	1.1	PROTOTYPE: $
259			PPCODE:
260	root	1.31	XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U, ix)));
261	root	1.1
262			void
263			decompress(data)
264			SV * data
265			PROTOTYPE: $
266			PPCODE:
267			XPUSHs (sv_2mortal (decompress_sv (data, 0)));
268
269			void
270			sfreeze(sv)
271			SV * sv
272			ALIAS:
273	root	1.31	sfreeze = 0
274			sfreeze_cr = 1
275			sfreeze_c = 2
276			sfreeze_best = 4
277			sfreeze_cr_best = 5
278			sfreeze_c_best = 6
279	root	1.1	PROTOTYPE: $
280			PPCODE:
281	root	1.31	{
282			int best = ix & 4;
283			ix &= 3;
284	root	1.1
285	root	1.10	SvGETMAGIC (sv);
286
287	root	1.4	if (!SvOK (sv))
288			XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */
289	root	1.12	else if (SvROK (sv)
290	root	1.24	\|\| SvUTF8 (sv)
291			\|\| (SvTYPE(sv) != SVt_IV
292			&& SvTYPE(sv) != SVt_NV
293			&& SvTYPE(sv) != SVt_PV
294			&& SvTYPE(sv) != SVt_PVIV
295			&& SvTYPE(sv) != SVt_PVNV
296			&& SvTYPE(sv) != SVt_PVMG)) /* mstore */
297	root	1.1	{
298	root	1.9	int deref = !SvROK (sv);
299	root	1.26	char *pv;
300	root	1.9
301	root	1.1	if (!storable_mstore)
302	root	1.25	{
303			PUTBACK;
304			need_storable ();
305			SPAGAIN;
306			}
307	root	1.1
308	root	1.9	if (deref)
309			sv = newRV_noinc (sv);
310
311	root	1.1	PUSHMARK (SP);
312			XPUSHs (sv);
313			PUTBACK;
314
315			if (1 != call_sv ((SV *)storable_mstore, G_SCALAR))
316	root	1.28	croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mstore));
317	root	1.1
318			SPAGAIN;
319
320			sv = POPs;
321	root	1.26	pv = SvPV_nolen (sv);
322	root	1.1
323	root	1.26	if (*pv == MAGIC_R)
324	root	1.20	{
325			if (deref)
326	root	1.26	*pv = MAGIC_R_deref;
327	root	1.20	}
328			else
329			{
330			char pfx[2];
331
332			pfx[0] = MAGIC_undef;
333			pfx[1] = deref ? MAGIC_R_deref : MAGIC_R;
334	root	1.1
335	root	1.20	sv_insert (sv, 0, 0, pfx, 2);
336			}
337	root	1.10
338	root	1.1	if (ix) /* compress */
339	root	1.31	sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1, best));
340	root	1.9
341	root	1.10	XPUSHs (sv);
342	root	1.1	}
343	root	1.13	else if (SvPOKp (sv) && IN_RANGE (SvPVX (sv)[0], MAGIC_LO, MAGIC_HI))
344	root	1.31	XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U, best))); /* need to prefix only */
345	root	1.1	else if (ix == 2) /* compress always */
346	root	1.31	XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1, best)));
347	root	1.15	else if (SvNIOK (sv)) /* don't compress */
348			{
349			STRLEN len;
350			char *s = SvPV (sv, len);
351			XPUSHs (sv_2mortal (newSVpvn (s, len)));
352			}
353	root	1.1	else /* don't compress */
354	root	1.15	XPUSHs (sv_2mortal (newSVsv (sv)));
355	root	1.31	}
356	root	1.1
357			void
358			sthaw(sv)
359			SV * sv
360			PROTOTYPE: $
361			PPCODE:
362	root	1.20	{
363			STRLEN svlen;
364	root	1.9	int deref = 0;
365
366	root	1.7	SvGETMAGIC (sv);
367	root	1.24	if (SvPOK (sv) && IN_RANGE (SvPVbyte (sv, svlen)[0], MAGIC_LO, MAGIC_HI))
368	root	1.1	{
369	root	1.20	redo:
370
371	root	1.1	switch (SvPVX (sv)[0])
372			{
373	root	1.4	case MAGIC_undef:
374	root	1.20	if (svlen <= 1)
375			XPUSHs (sv_2mortal (NEWSV (0, 0)));
376			else
377			{
378			if (SvPVX (sv)[1] == MAGIC_R_deref)
379			deref = 1;
380			else if (SvPVX (sv)[1] != MAGIC_R)
381			croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
382
383			sv_chop (sv, SvPVX (sv) + 2);
384
385			if (!storable_mstore)
386	root	1.25	{
387			PUTBACK;
388			need_storable ();
389			SPAGAIN;
390			}
391	root	1.20
392			PUSHMARK (SP);
393			XPUSHs (sv);
394			PUTBACK;
395
396			if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
397	root	1.28	croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));
398	root	1.20
399			SPAGAIN;
400
401			if (deref)
402			SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));
403			else
404			SETs (sv_2mortal (newSVsv (TOPs)));
405			}
406	root	1.4	break;
407
408	root	1.1	case MAGIC_U:
409			XPUSHs (sv_2mortal (decompress_sv (sv, 0)));
410			break;
411
412			case MAGIC_C:
413			XPUSHs (sv_2mortal (decompress_sv (sv, 1)));
414			break;
415
416	root	1.10	case MAGIC_R_deref:
417			deref = 1;
418			SvPVX (sv)[0] = MAGIC_R;
419			goto handle_MAGIC_R;
420
421	root	1.9	case MAGIC_CR_deref:
422			deref = 1;
423	root	1.1	case MAGIC_CR:
424			sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */
425	root	1.10	if (deref)
426			if (SvPVX (sv)[0] == MAGIC_R_deref)
427	root	1.9	SvPVX (sv)[0] = MAGIC_R;
428	root	1.20
429			goto redo;
430	root	1.10
431	root	1.1	case MAGIC_R:
432	root	1.10	handle_MAGIC_R:
433	root	1.1	if (!storable_mstore)
434	root	1.25	{
435			PUTBACK;
436			need_storable ();
437			SPAGAIN;
438			}
439	root	1.1
440			PUSHMARK (SP);
441			XPUSHs (sv);
442			PUTBACK;
443
444			if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
445	root	1.28	croak ("%s didn't return a single scalar", SvPVbyte_nolen (serializer_mretrieve));
446	root	1.1
447			SPAGAIN;
448
449	root	1.9	if (deref)
450			{
451	root	1.10	SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));
452	root	1.9
453			if (SvPVX (sv)[0] == MAGIC_R)
454	root	1.10	SvPVX (sv)[0] = MAGIC_R_deref;
455	root	1.9	}
456	root	1.10	else
457	pcg	1.17	SETs (sv_2mortal (newSVsv (TOPs)));
458	root	1.1
459			break;
460
461			default:
462			croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
463			}
464			}
465			else
466	root	1.11	XPUSHs (sv_2mortal (newSVsv (sv)));
467	root	1.20	}
468	pcg	1.16