1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
#include "fitz.h"
#include <zlib.h>
typedef struct fz_flate_s fz_flate;
struct fz_flate_s
{
fz_filter super;
z_stream z;
};
static void *
zmalloc(void *opaque, unsigned int items, unsigned int size)
{
return fz_malloc(items * size);
}
static void
zfree(void *opaque, void *ptr)
{
fz_free(ptr);
}
fz_filter *
fz_newflated(fz_obj *params)
{
int ei;
FZ_NEWFILTER(fz_flate, f, flated);
f->z.zalloc = zmalloc;
f->z.zfree = zfree;
f->z.opaque = nil;
f->z.next_in = nil;
f->z.avail_in = 0;
ei = inflateInit(&f->z);
if (ei != Z_OK)
{
fz_warn("zlib error: inflateInit: %s", f->z.msg);
}
return (fz_filter*)f;
}
void
fz_dropflated(fz_filter *f)
{
z_streamp zp = &((fz_flate*)f)->z;
int err;
err = inflateEnd(zp);
if (err != Z_OK)
fz_warn("inflateEnd: %s", zp->msg);
}
fz_error
fz_processflated(fz_filter *f, fz_buffer *in, fz_buffer *out)
{
z_streamp zp = &((fz_flate*)f)->z;
int err;
if (in->rp == in->wp && !in->eof)
return fz_ioneedin;
if (out->wp == out->ep)
return fz_ioneedout;
zp->next_in = in->rp;
zp->avail_in = in->wp - in->rp;
zp->next_out = out->wp;
zp->avail_out = out->ep - out->wp;
err = inflate(zp, Z_SYNC_FLUSH);
in->rp = in->wp - zp->avail_in;
out->wp = out->ep - zp->avail_out;
if (err == Z_DATA_ERROR && in->eof && in->rp == in->wp)
{
fz_warn("ignoring zlib error: %s", zp->msg);
return fz_iodone;
}
else if (err == Z_STREAM_END || err == Z_BUF_ERROR)
{
return fz_iodone;
}
else if (err == Z_OK)
{
if (in->rp == in->wp && !in->eof)
return fz_ioneedin;
if (out->wp == out->ep)
return fz_ioneedout;
return fz_ioneedin; /* hmm, what's going on here? */
}
else
{
return fz_throw("zlib error: inflate: %s", zp->msg);
}
}
|
