Compress-LZF/LZF.xs

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

/* try to be compatible with older perls */
/* SvPV_nolen() macro first defined in 5.005_55 */
/* this is slow, not threadsafe, but works */
#include "patchlevel.h"
#if (PATCHLEVEL == 4) || ((PATCHLEVEL == 5) && (SUBVERSION < 55))
static STRLEN nolen_na;
# define SvPV_nolen(sv) SvPV ((sv), nolen_na)
#endif
#if PATCHLEVEL < 6
# define call_sv perl_call_sv
#endif

#define LZF_STANDALONE 1
#define LZF_STATE_ARG 1

#include "lzf_c.c"
#include "lzf_d.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)
{
  LZF_STATE *state;
  STRLEN usize, csize;
  char *src = (char *)SvPV (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 :
              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 *)SvPV (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)
{
#if PATCHLEVEL < 6
  char req[8192];
  sprintf (req, "require %s;", SvPV_nolen (serializer_package));
  perl_eval_pv (req, 1);
#else
  load_module (PERL_LOADMOD_NOIMPORT, serializer_package, Nullsv);
#endif

  storable_mstore    = GvCV (gv_fetchpv (SvPV_nolen (serializer_mstore   ), TRUE, SVt_PVCV));
  storable_mretrieve = GvCV (gv_fetchpv (SvPV_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);
        storable_mstore =
        storable_mretrieve = 0;

void
compress(data)
        SV *    data
        PROTOTYPE: $
        PPCODE:
        XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U)));

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

void
sfreeze(sv)
        SV *    sv
        ALIAS:
        sfreeze_cr = 1
        sfreeze_c  = 2
        PROTOTYPE: $
        PPCODE:

        SvGETMAGIC (sv);

        if (!SvOK (sv))
          XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */
        else if (SvROK (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);

            if (!storable_mstore)
              need_storable ();

            if (deref)
              sv = newRV_noinc (sv);

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

            if (1 != call_sv ((SV *)storable_mstore, G_SCALAR))
              croak ("Storable::mstore didn't return a single scalar");

            SPAGAIN;

            sv = POPs;

            if (SvPVX (sv)[0] == MAGIC_R)
              {
                if (deref)
                  SvPVX (sv)[0] = 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));

            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))); /* need to prefix only */
        else if (ix == 2) /* compress always */
          XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1)));
        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 (SvPV (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)
                        need_storable ();

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

                      if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
                        croak ("Storable::mstore didn't return a single scalar");

                      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)
                    need_storable ();

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

                  if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
                    croak ("Storable::mstore didn't return a single scalar");

                  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:	1.23
Committed:	Fri Feb 16 22:11:17 2007 UTC (17 years, 3 months ago) by root
Branch:	MAIN
CVS Tags:	rel-1_71
Changes since 1.22:	+11 -3 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#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	root	1.2	#if PATCHLEVEL < 6
14			# define call_sv perl_call_sv
15			#endif
16	root	1.1
17	root	1.23	#define LZF_STANDALONE 1
18			#define LZF_STATE_ARG 1
19
20	root	1.1	#include "lzf_c.c"
21			#include "lzf_d.c"
22
23			/* we re-use the storable header for our purposes */
24			#define MAGIC_LO 0
25			#define MAGIC_U 0 /* uncompressed data follows */
26			#define MAGIC_C 1 /* compressed data follows */
27	root	1.4	#define MAGIC_undef 2 /* the special value undef */
28			#define MAGIC_CR 3 /* storable (reference, freeze), compressed */
29	root	1.1	#define MAGIC_R 4 /* storable (reference, freeze) */
30	root	1.9	#define MAGIC_CR_deref 5 /* storable (NO reference, freeze), compressed */
31	root	1.10	#define MAGIC_R_deref 6 /* storable (NO reference, freeze) */
32	root	1.1	#define MAGIC_HI 7 /* room for one higher storable major */
33	root	1.20	/* for historical reasons, MAGIC_undef + MAGIC_R and MAGIC_undef + MAGIC_R_deref are used, too */
34	root	1.1
35			#define IN_RANGE(v,l,h) ((unsigned int)((unsigned)(v) - (unsigned)(l)) <= (unsigned)(h) - (unsigned)(l))
36
37	root	1.14	static SV serializer_package, serializer_mstore, *serializer_mretrieve;
38	root	1.1	static CV storable_mstore, storable_mretrieve;
39
40	root	1.20	#if Size_t_size > 4
41			# define MAX_LENGTH ((Size_t)0x80000000L)
42			#else
43			# define MAX_LENGTH ((Size_t) 0x8000000L)
44			#endif
45
46	root	1.1	static SV *
47	root	1.10	compress_sv (SV *data, char cprepend, int uprepend)
48	root	1.1	{
49	root	1.23	LZF_STATE *state;
50	root	1.1	STRLEN usize, csize;
51			char src = (char )SvPV (data, usize);
52
53			if (usize)
54			{
55			SV *ret = NEWSV (0, usize + 1);
56			unsigned char *dst;
57			int skip = 0;
58
59			SvPOK_only (ret);
60			dst = (unsigned char *)SvPVX (ret);
61
62			if (cprepend)
63			dst[skip++] = cprepend;
64
65	root	1.20	if (usize <= 0x7f)
66	root	1.1	{
67			dst[skip++] = usize;
68			}
69	root	1.20	else if (usize <= 0x7ff)
70	root	1.1	{
71			dst[skip++] = (( usize >> 6) \| 0xc0);
72			dst[skip++] = (( usize & 0x3f) \| 0x80);
73			}
74	root	1.20	else if (usize <= 0xffff)
75	root	1.1	{
76			dst[skip++] = (( usize >> 12) \| 0xe0);
77			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
78			dst[skip++] = (( usize & 0x3f) \| 0x80);
79			}
80	root	1.20	else if (usize <= 0x1fffff)
81	root	1.1	{
82			dst[skip++] = (( usize >> 18) \| 0xf0);
83			dst[skip++] = (((usize >> 12) & 0x3f) \| 0x80);
84			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
85			dst[skip++] = (( usize & 0x3f) \| 0x80);
86			}
87	root	1.20	else if (usize <= 0x3ffffff)
88	root	1.1	{
89			dst[skip++] = (( usize >> 24) \| 0xf8);
90			dst[skip++] = (((usize >> 18) & 0x3f) \| 0x80);
91			dst[skip++] = (((usize >> 12) & 0x3f) \| 0x80);
92			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
93			dst[skip++] = (( usize & 0x3f) \| 0x80);
94			}
95	root	1.20	else if (usize <= 0x7fffffff)
96			{
97			dst[skip++] = (( usize >> 30) \| 0xfc);
98			dst[skip++] = (((usize >> 24) & 0x3f) \| 0x80);
99			dst[skip++] = (((usize >> 18) & 0x3f) \| 0x80);
100			dst[skip++] = (((usize >> 12) & 0x3f) \| 0x80);
101			dst[skip++] = (((usize >> 6) & 0x3f) \| 0x80);
102			dst[skip++] = (( usize & 0x3f) \| 0x80);
103			}
104	root	1.1	else
105	root	1.20	croak ("compress can only compress up to %ld bytes", 0x7fffffffL);
106	root	1.1
107	root	1.23	New (0, state, 1, LZF_STATE);
108			if (!state)
109			croak ("Compress::LZF unable to allocate memory for compression state");
110
111	root	1.1	/* 11 bytes is the smallest compressible string */
112			csize = usize < 11 ? 0 :
113	root	1.23	lzf_compress (src, usize, dst + skip, usize - skip, *state);
114
115			Safefree (state);
116	root	1.1
117			if (csize)
118			{
119			SvCUR_set (ret, csize + skip);
120			}
121	root	1.10	else if (uprepend < 0)
122	root	1.1	{
123			SvREFCNT_dec (ret);
124			ret = SvREFCNT_inc (data);
125			}
126			else
127			{
128	root	1.10	*dst++ = uprepend;
129	root	1.1
130			Move ((void )src, (void )dst, usize, unsigned char);
131
132			SvCUR_set (ret, usize + 1);
133			}
134
135			return ret;
136			}
137			else
138			return newSVpv ("", 0);
139			}
140
141			static SV *
142			decompress_sv (SV *data, int skip)
143			{
144			STRLEN usize, csize;
145			unsigned char src = (unsigned char )SvPV (data, csize) + skip;
146
147			if (csize)
148			{
149			void *dst;
150			SV *ret;
151
152			csize -= skip;
153
154			if (src[0])
155			{
156	root	1.21	if (!(src[0] & 0x80) && csize >= 1)
157	root	1.1	{
158			csize -= 1;
159			usize = *src++ & 0xff;
160			}
161	root	1.21	else if (!(src[0] & 0x20) && csize >= 2)
162	root	1.1	{
163			csize -= 2;
164			usize = *src++ & 0x1f;
165			usize = (usize << 6) \| (*src++ & 0x3f);
166			}
167	root	1.21	else if (!(src[0] & 0x10) && csize >= 3)
168	root	1.1	{
169			csize -= 3;
170			usize = *src++ & 0x0f;
171			usize = (usize << 6) \| (*src++ & 0x3f);
172			usize = (usize << 6) \| (*src++ & 0x3f);
173			}
174	root	1.21	else if (!(src[0] & 0x08) && csize >= 4)
175	root	1.1	{
176			csize -= 4;
177			usize = *src++ & 0x07;
178			usize = (usize << 6) \| (*src++ & 0x3f);
179			usize = (usize << 6) \| (*src++ & 0x3f);
180			usize = (usize << 6) \| (*src++ & 0x3f);
181			}
182	root	1.21	else if (!(src[0] & 0x04) && csize >= 5)
183	root	1.1	{
184			csize -= 5;
185			usize = *src++ & 0x03;
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	1.21	else if (!(src[0] & 0x02) && csize >= 6)
192	root	1.20	{
193			csize -= 6;
194			usize = *src++ & 0x01;
195			usize = (usize << 6) \| (*src++ & 0x3f);
196			usize = (usize << 6) \| (*src++ & 0x3f);
197			usize = (usize << 6) \| (*src++ & 0x3f);
198			usize = (usize << 6) \| (*src++ & 0x3f);
199			usize = (usize << 6) \| (*src++ & 0x3f);
200			}
201	root	1.1	else
202	root	1.13	croak ("compressed data corrupted (invalid length)");
203	root	1.21
204			if (!usize)
205			croak ("compressed data corrupted (invalid length)");
206	root	1.1
207			ret = NEWSV (0, usize);
208			SvPOK_only (ret);
209			dst = SvPVX (ret);
210
211			if (lzf_decompress (src, csize, dst, usize) != usize)
212	root	1.22	{
213			SvREFCNT_dec (ret);
214			croak ("compressed data corrupted (size mismatch)", csize, skip, usize);
215			}
216	root	1.1	}
217			else
218			{
219			usize = csize - 1;
220	root	1.21	ret = NEWSV (0, usize \| 1);
221	root	1.1	SvPOK_only (ret);
222
223			Move ((void )(src + 1), (void )SvPVX (ret), usize, unsigned char);
224			}
225
226			SvCUR_set (ret, usize);
227
228			return ret;
229			}
230			else
231			return newSVpvn ("", 0);
232			}
233
234			static void
235			need_storable(void)
236			{
237	root	1.2	#if PATCHLEVEL < 6
238	root	1.14	char req[8192];
239			sprintf (req, "require %s;", SvPV_nolen (serializer_package));
240			perl_eval_pv (req, 1);
241	root	1.2	#else
242	root	1.14	load_module (PERL_LOADMOD_NOIMPORT, serializer_package, Nullsv);
243	root	1.2	#endif
244	root	1.1
245	root	1.14	storable_mstore = GvCV (gv_fetchpv (SvPV_nolen (serializer_mstore ), TRUE, SVt_PVCV));
246			storable_mretrieve = GvCV (gv_fetchpv (SvPV_nolen (serializer_mretrieve), TRUE, SVt_PVCV));
247	root	1.1	}
248
249			MODULE = Compress::LZF PACKAGE = Compress::LZF
250	root	1.14
251			BOOT:
252			serializer_package = newSVpv ("Storable", 0);
253	root	1.20	serializer_mstore = newSVpv ("Storable::net_mstore", 0);
254	root	1.14	serializer_mretrieve = newSVpv ("Storable::mretrieve", 0);
255
256			void
257			set_serializer(package, mstore, mretrieve)
258			SV * package
259			SV * mstore
260			SV * mretrieve
261			PROTOTYPE: $$$
262			PPCODE:
263			SvSetSV (serializer_package , package );
264			SvSetSV (serializer_mstore , mstore );
265			SvSetSV (serializer_mretrieve, mretrieve);
266			storable_mstore =
267			storable_mretrieve = 0;
268	root	1.1
269			void
270			compress(data)
271			SV * data
272			PROTOTYPE: $
273			PPCODE:
274	root	1.10	XPUSHs (sv_2mortal (compress_sv (data, 0, MAGIC_U)));
275	root	1.1
276			void
277			decompress(data)
278			SV * data
279			PROTOTYPE: $
280			PPCODE:
281			XPUSHs (sv_2mortal (decompress_sv (data, 0)));
282
283			void
284			sfreeze(sv)
285			SV * sv
286			ALIAS:
287			sfreeze_cr = 1
288			sfreeze_c = 2
289			PROTOTYPE: $
290			PPCODE:
291
292	root	1.10	SvGETMAGIC (sv);
293
294	root	1.4	if (!SvOK (sv))
295			XPUSHs (sv_2mortal (newSVpvn ("\02", 1))); /* 02 == MAGIC_undef */
296	root	1.12	else if (SvROK (sv)
297			\|\| (SvTYPE(sv) != SVt_IV
298			&& SvTYPE(sv) != SVt_NV
299			&& SvTYPE(sv) != SVt_PV
300	root	1.15	&& SvTYPE(sv) != SVt_PVIV
301			&& SvTYPE(sv) != SVt_PVNV
302	root	1.12	&& SvTYPE(sv) != SVt_PVMG)) /* mstore */
303	root	1.1	{
304	root	1.9	int deref = !SvROK (sv);
305
306	root	1.1	if (!storable_mstore)
307			need_storable ();
308
309	root	1.9	if (deref)
310			sv = newRV_noinc (sv);
311
312	root	1.1	PUSHMARK (SP);
313			XPUSHs (sv);
314			PUTBACK;
315
316			if (1 != call_sv ((SV *)storable_mstore, G_SCALAR))
317			croak ("Storable::mstore didn't return a single scalar");
318
319			SPAGAIN;
320
321			sv = POPs;
322
323	root	1.20	if (SvPVX (sv)[0] == MAGIC_R)
324			{
325			if (deref)
326			SvPVX (sv)[0] = MAGIC_R_deref;
327			}
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	1.10	sv = sv_2mortal (compress_sv (sv, deref ? MAGIC_CR_deref : MAGIC_CR, -1));
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	1.10	XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, MAGIC_U))); /* need to prefix only */
345	root	1.1	else if (ix == 2) /* compress always */
346	root	1.10	XPUSHs (sv_2mortal (compress_sv (sv, MAGIC_C, -1)));
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	1.1
356			void
357			sthaw(sv)
358			SV * sv
359			PROTOTYPE: $
360			PPCODE:
361	root	1.20	{
362			STRLEN svlen;
363	root	1.9	int deref = 0;
364
365	root	1.7	SvGETMAGIC (sv);
366	root	1.20	if (SvPOK (sv) && IN_RANGE (SvPV (sv, svlen)[0], MAGIC_LO, MAGIC_HI))
367	root	1.1	{
368	root	1.20	redo:
369
370	root	1.1	switch (SvPVX (sv)[0])
371			{
372	root	1.4	case MAGIC_undef:
373	root	1.20	if (svlen <= 1)
374			XPUSHs (sv_2mortal (NEWSV (0, 0)));
375			else
376			{
377			if (SvPVX (sv)[1] == MAGIC_R_deref)
378			deref = 1;
379			else if (SvPVX (sv)[1] != MAGIC_R)
380			croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
381
382			sv_chop (sv, SvPVX (sv) + 2);
383
384			if (!storable_mstore)
385			need_storable ();
386
387			PUSHMARK (SP);
388			XPUSHs (sv);
389			PUTBACK;
390
391			if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
392			croak ("Storable::mstore didn't return a single scalar");
393
394			SPAGAIN;
395
396			if (deref)
397			SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));
398			else
399			SETs (sv_2mortal (newSVsv (TOPs)));
400			}
401	root	1.4	break;
402
403	root	1.1	case MAGIC_U:
404			XPUSHs (sv_2mortal (decompress_sv (sv, 0)));
405			break;
406
407			case MAGIC_C:
408			XPUSHs (sv_2mortal (decompress_sv (sv, 1)));
409			break;
410
411	root	1.10	case MAGIC_R_deref:
412			deref = 1;
413			SvPVX (sv)[0] = MAGIC_R;
414			goto handle_MAGIC_R;
415
416	root	1.9	case MAGIC_CR_deref:
417			deref = 1;
418	root	1.1	case MAGIC_CR:
419			sv = sv_2mortal (decompress_sv (sv, 1)); /* mortal could be optimized */
420	root	1.10	if (deref)
421			if (SvPVX (sv)[0] == MAGIC_R_deref)
422	root	1.9	SvPVX (sv)[0] = MAGIC_R;
423	root	1.20
424			goto redo;
425	root	1.10
426	root	1.1	case MAGIC_R:
427	root	1.10	handle_MAGIC_R:
428	root	1.1	if (!storable_mstore)
429			need_storable ();
430
431			PUSHMARK (SP);
432			XPUSHs (sv);
433			PUTBACK;
434
435			if (1 != call_sv ((SV *)storable_mretrieve, G_SCALAR))
436			croak ("Storable::mstore didn't return a single scalar");
437
438			SPAGAIN;
439
440	root	1.9	if (deref)
441			{
442	root	1.10	SETs (sv_2mortal (SvREFCNT_inc (SvRV (TOPs))));
443	root	1.9
444			if (SvPVX (sv)[0] == MAGIC_R)
445	root	1.10	SvPVX (sv)[0] = MAGIC_R_deref;
446	root	1.9	}
447	root	1.10	else
448	pcg	1.17	SETs (sv_2mortal (newSVsv (TOPs)));
449	root	1.1
450			break;
451
452			default:
453			croak ("Compress::LZF::sthaw(): invalid data, maybe you need a newer version of Compress::LZF?");
454			}
455			}
456			else
457	root	1.11	XPUSHs (sv_2mortal (newSVsv (sv)));
458	root	1.20	}
459	pcg	1.16