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 "lzv1/lzv1.c" |
15 |
|
16 |
MODULE = Compress::LZV1 PACKAGE = Compress::LZV1 |
17 |
|
18 |
SV * |
19 |
compress(data) |
20 |
SV * data |
21 |
PROTOTYPE: $ |
22 |
CODE: |
23 |
{ |
24 |
STRLEN usize, csize; |
25 |
void *src = SvPV(data, usize); |
26 |
unsigned char *dst; |
27 |
unsigned short heap[HSIZ]; /* need not be initialized */ |
28 |
|
29 |
if (usize) |
30 |
{ |
31 |
RETVAL = NEWSV (0, usize + 1); |
32 |
SvPOK_only (RETVAL); |
33 |
dst = (unsigned char *)SvPV_nolen (RETVAL); |
34 |
|
35 |
/* compress */ |
36 |
csize = wLZV1 ((uch *)src, (uch *)(dst + 4), heap, usize, usize - 5); |
37 |
if (csize) |
38 |
{ |
39 |
dst[0] = 'L'; /* compressed flag */ |
40 |
dst[1] = usize >> 16; |
41 |
dst[2] = usize >> 8; |
42 |
dst[3] = usize >> 0; |
43 |
|
44 |
SvCUR_set (RETVAL, csize + 4); |
45 |
} |
46 |
else |
47 |
{ |
48 |
dst[0] = 'U'; |
49 |
Move ((void *)src, (void *)(dst + 1), usize, unsigned char); |
50 |
SvCUR_set (RETVAL, usize + 1); |
51 |
} |
52 |
} |
53 |
else |
54 |
RETVAL = newSVpv ("", 0); |
55 |
} |
56 |
OUTPUT: |
57 |
RETVAL |
58 |
|
59 |
SV * |
60 |
decompress(data) |
61 |
SV * data |
62 |
PROTOTYPE: $ |
63 |
CODE: |
64 |
{ |
65 |
STRLEN usize, csize; |
66 |
unsigned char *src = (unsigned char *)SvPV(data, csize); |
67 |
void *dst; |
68 |
|
69 |
if (csize) |
70 |
{ |
71 |
switch (src[0]) { |
72 |
case 'U': |
73 |
usize = csize - 1; |
74 |
RETVAL = NEWSV (0, usize); |
75 |
SvPOK_only (RETVAL); |
76 |
dst = SvPV_nolen (RETVAL); |
77 |
|
78 |
Move ((void *)(src + 1), (void *)dst, usize, unsigned char); |
79 |
break; |
80 |
case 'L': |
81 |
usize = (src[1] << 16) |
82 |
| (src[2] << 8) |
83 |
| (src[3] << 0); |
84 |
RETVAL = NEWSV (0, usize); |
85 |
SvPOK_only (RETVAL); |
86 |
dst = SvPV_nolen (RETVAL); |
87 |
|
88 |
if (rLZV1 ((uch *)(src + 4), (uch *)dst, csize - 4, usize) != usize) |
89 |
croak ("LZV1: compressed data corrupted (2)"); |
90 |
break; |
91 |
default: |
92 |
croak ("LZV1: compressed data corrupted (1)"); |
93 |
} |
94 |
|
95 |
SvCUR_set (RETVAL, usize); |
96 |
} |
97 |
else |
98 |
RETVAL = newSVpvn ("", 0); |
99 |
|
100 |
} |
101 |
OUTPUT: |
102 |
RETVAL |
103 |
|