File: zlibstubs.c

package info (click to toggle)
camlpdf 0.5-1
  • links: PTS, VCS
  • area: non-free
  • in suites: squeeze, wheezy
  • size: 1,516 kB
  • ctags: 2,689
  • sloc: ml: 18,229; ansic: 139; makefile: 139
file content (175 lines) | stat: -rw-r--r-- 5,776 bytes parent folder | download | duplicates (3)
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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
/***********************************************************************/
/*                                                                     */
/*                      The CamlZip library                            */
/*                                                                     */
/*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         */
/*                                                                     */
/*  Copyright 2001 Institut National de Recherche en Informatique et   */
/*  en Automatique.  All rights reserved.  This file is distributed    */
/*  under the terms of the GNU Library General Public License, with    */
/*  the special exception on linking described in file LICENSE.        */
/*                                                                     */
/***********************************************************************/

/* $Id: zlibstubs.c,v 1.3 2006/04/04 08:29:07 xleroy Exp $ */

/* Stub code to interface with Zlib */

#include <zlib.h>

#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/callback.h>
#include <caml/fail.h>
#include <caml/memory.h>

#define ZStream_val(v) ((z_stream *) (v))

static value * camlzip_error_exn = NULL;

static void camlzip_error(char * fn, value vzs)
{
  char * msg;
  value s1 = Val_unit, s2 = Val_unit, bucket = Val_unit;

  msg = ZStream_val(vzs)->msg;
  if (msg == NULL) msg = "";
  if (camlzip_error_exn == NULL) {
    camlzip_error_exn = caml_named_value("Zlib.Error");
    if (camlzip_error_exn == NULL)
      invalid_argument("Exception Zlib.Error not initialized");
  }
  Begin_roots3(s1, s2, bucket);
    s1 = copy_string(fn);
    s2 = copy_string(msg);
    bucket = alloc_small(3, 0);
    Field(bucket, 0) = *camlzip_error_exn;
    Field(bucket, 1) = s1;
    Field(bucket, 2) = s2;
  End_roots();
  mlraise(bucket);
}

static value camlzip_new_stream(void)
{
  value res = alloc((sizeof(z_stream) + sizeof(value) - 1) / sizeof(value),
                    Abstract_tag);
  ZStream_val(res)->zalloc = NULL;
  ZStream_val(res)->zfree = NULL;
  ZStream_val(res)->opaque = NULL;
  ZStream_val(res)->next_in = NULL;
  ZStream_val(res)->next_out = NULL;
  return res;
}

value camlzip_deflateInit(value vlevel, value expect_header)
{
  value vzs = camlzip_new_stream();
  if (deflateInit2(ZStream_val(vzs),
                   Int_val(vlevel),
                   Z_DEFLATED,
                   Bool_val(expect_header) ? MAX_WBITS : -MAX_WBITS,
                   8,
                   Z_DEFAULT_STRATEGY) != Z_OK)
    camlzip_error("Zlib.deflateInit", vzs);
  return vzs;
}

static int camlzip_flush_table[] = 
{ Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH };

value camlzip_deflate(value vzs, value srcbuf, value srcpos, value srclen,
                      value dstbuf, value dstpos, value dstlen,
                      value vflush)
{
  z_stream * zs = ZStream_val(vzs);
  int retcode;
  long used_in, used_out;
  value res;

  zs->next_in = &Byte_u(srcbuf, Long_val(srcpos));
  zs->avail_in = Long_val(srclen);
  zs->next_out = &Byte_u(dstbuf, Long_val(dstpos));
  zs->avail_out = Long_val(dstlen);
  retcode = deflate(zs, camlzip_flush_table[Int_val(vflush)]);
  if (retcode < 0) camlzip_error("Zlib.deflate", vzs);
  used_in = Long_val(srclen) - zs->avail_in;
  used_out = Long_val(dstlen) - zs->avail_out;
  zs->next_in = NULL;         /* not required, but cleaner */
  zs->next_out = NULL;        /* (avoid dangling pointers into Caml heap) */
  res = alloc_small(3, 0);
  Field(res, 0) = Val_bool(retcode == Z_STREAM_END);
  Field(res, 1) = Val_int(used_in);
  Field(res, 2) = Val_int(used_out);
  return res;
}

value camlzip_deflate_bytecode(value * arg, int nargs)
{
  return camlzip_deflate(arg[0], arg[1], arg[2], arg[3],
                         arg[4], arg[5], arg[6], arg[7]);
}

value camlzip_deflateEnd(value vzs)
{
  if (deflateEnd(ZStream_val(vzs)) != Z_OK)
    camlzip_error("Zlib.deflateEnd", vzs);
  return Val_unit;
}

value camlzip_inflateInit(value expect_header)
{
  value vzs = camlzip_new_stream();
  if (inflateInit2(ZStream_val(vzs),
                   Bool_val(expect_header) ? MAX_WBITS : -MAX_WBITS) != Z_OK)
    camlzip_error("Zlib.inflateInit", vzs);
  return vzs;
}

value camlzip_inflate(value vzs, value srcbuf, value srcpos, value srclen,
                      value dstbuf, value dstpos, value dstlen,
                      value vflush)
{
  z_stream * zs = ZStream_val(vzs);
  int retcode;
  long used_in, used_out;
  value res;

  zs->next_in = &Byte_u(srcbuf, Long_val(srcpos));
  zs->avail_in = Long_val(srclen);
  zs->next_out = &Byte_u(dstbuf, Long_val(dstpos));
  zs->avail_out = Long_val(dstlen);
  retcode = inflate(zs, camlzip_flush_table[Int_val(vflush)]);
  if (retcode < 0 || retcode == Z_NEED_DICT)
    camlzip_error("Zlib.inflate", vzs);
  used_in = Long_val(srclen) - zs->avail_in;
  used_out = Long_val(dstlen) - zs->avail_out;
  zs->next_in = NULL;           /* not required, but cleaner */
  zs->next_out = NULL;          /* (avoid dangling pointers into Caml heap) */
  res = alloc_small(3, 0);
  Field(res, 0) = Val_bool(retcode == Z_STREAM_END);
  Field(res, 1) = Val_int(used_in);
  Field(res, 2) = Val_int(used_out);
  return res;
}

value camlzip_inflate_bytecode(value * arg, int nargs)
{
  return camlzip_inflate(arg[0], arg[1], arg[2], arg[3],
                         arg[4], arg[5], arg[6], arg[7]);
}

value camlzip_inflateEnd(value vzs)
{
  if (inflateEnd(ZStream_val(vzs)) != Z_OK)
    camlzip_error("Zlib.inflateEnd", vzs);
  return Val_unit;
}

value camlzip_update_crc32(value crc, value buf, value pos, value len)
{
  return copy_int32(crc32((uint32) Int32_val(crc), 
                          &Byte_u(buf, Long_val(pos)),
                          Long_val(len)));
}