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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/* Modifed for CamlPDF:
*
* - to prefix names with 'camlpdf' to avoid clashing symbols when zlib
* also linked
* - to harden against such malformed flate streams as may commonly
* appear in PDF files */
/***********************************************************************/
/* */
/* 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 "miniz.c" //Modified to use miniz.c rather than zlib
#include <stdint.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) ((mz_stream *) (v))
// So that the code links ok when using js_of_ocaml
char* camlpdf_caml_zlib_decompress(char *s) { return s; }
char* camlpdf_caml_zlib_compress(char *s) { return s; }
static const value * camlpdf_camlzip_error_exn = NULL;
static void camlpdf_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 (camlpdf_camlzip_error_exn == NULL) {
camlpdf_camlzip_error_exn = caml_named_value("Pdfflate.Error");
if (camlpdf_camlzip_error_exn == NULL)
caml_invalid_argument("Exception Pdfflate.Error not initialized");
}
Begin_roots3(s1, s2, bucket);
s1 = caml_copy_string(fn);
s2 = caml_copy_string(msg);
bucket = caml_alloc_small(3, 0);
Field(bucket, 0) = *camlpdf_camlzip_error_exn;
Field(bucket, 1) = s1;
Field(bucket, 2) = s2;
End_roots();
caml_raise(bucket);
}
static value camlpdf_camlzip_new_stream(void)
{
value res = caml_alloc((sizeof(mz_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 camlpdf_camlzip_deflateInit(value vlevel, value expect_header)
{
value vzs = camlpdf_camlzip_new_stream();
if (mz_deflateInit2(ZStream_val(vzs),
Int_val(vlevel),
MZ_DEFLATED,
Bool_val(expect_header) ? 15 : -15,
8,
MZ_DEFAULT_STRATEGY) != MZ_OK)
camlpdf_camlzip_error("Zlib.deflateInit", vzs);
return vzs;
}
static int camlpdf_camlzip_flush_table[] =
{ MZ_NO_FLUSH, MZ_SYNC_FLUSH, MZ_FULL_FLUSH, MZ_FINISH };
value camlpdf_camlzip_deflate(value vzs, value srcbuf, value srcpos, value srclen,
value dstbuf, value dstpos, value dstlen,
value vflush)
{
mz_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 = mz_deflate(zs, camlpdf_camlzip_flush_table[Int_val(vflush)]);
if (retcode < 0) camlpdf_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 = caml_alloc_small(3, 0);
Field(res, 0) = Val_bool(retcode == MZ_STREAM_END);
Field(res, 1) = Val_int(used_in);
Field(res, 2) = Val_int(used_out);
return res;
}
value camlpdf_camlzip_deflate_bytecode(value * arg, int nargs)
{
return camlpdf_camlzip_deflate(arg[0], arg[1], arg[2], arg[3],
arg[4], arg[5], arg[6], arg[7]);
}
value camlpdf_camlzip_deflateEnd(value vzs)
{
if (mz_deflateEnd(ZStream_val(vzs)) != MZ_OK)
camlpdf_camlzip_error("Zlib.deflateEnd", vzs);
return Val_unit;
}
/* CamlZIP now treats Z_BUF_ERROR and Z_DATA_ERROR as non-fatal. However, this
* can lead to lack of progress on some malformed streams (at least with
* miniz.c -- maybe not zlib. So we have this hack. */
int camlpdf_buf_error_count;
value camlpdf_camlzip_inflateInit(value expect_header)
{
camlpdf_buf_error_count = 0;
value vzs = camlpdf_camlzip_new_stream();
if (mz_inflateInit2(ZStream_val(vzs),
Bool_val(expect_header) ? 15 : -15) != MZ_OK)
camlpdf_camlzip_error("Zlib.inflateInit", vzs);
return vzs;
}
value camlpdf_camlzip_inflate(value vzs, value srcbuf, value srcpos, value srclen,
value dstbuf, value dstpos, value dstlen,
value vflush)
{
mz_stream * zs = ZStream_val(vzs);
int retcode;
long used_in, used_out;
value res;
/*printf("srclen = %li\n", Long_val(srclen));*/
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 = mz_inflate(zs, camlpdf_camlzip_flush_table[Int_val(vflush)]);
/*printf("retcode = %i\n", retcode);*/
if (retcode == MZ_BUF_ERROR || retcode == MZ_DATA_ERROR) camlpdf_buf_error_count += 1; else camlpdf_buf_error_count = 0;
if (retcode < 0 && retcode != MZ_BUF_ERROR && retcode != MZ_DATA_ERROR ||
retcode == MZ_NEED_DICT)
camlpdf_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 = caml_alloc_small(3, 0);
Field(res, 0) = Val_bool(retcode == MZ_STREAM_END || camlpdf_buf_error_count > 1);
Field(res, 1) = Val_int(used_in);
Field(res, 2) = Val_int(used_out);
return res;
}
value camlpdf_camlzip_inflate_bytecode(value * arg, int nargs)
{
return camlpdf_camlzip_inflate(arg[0], arg[1], arg[2], arg[3],
arg[4], arg[5], arg[6], arg[7]);
}
value camlpdf_camlzip_inflateEnd(value vzs)
{
if (mz_inflateEnd(ZStream_val(vzs)) != MZ_OK)
camlpdf_camlzip_error("Zlib.inflateEnd", vzs);
return Val_unit;
}
value camlpdf_camlzip_update_crc32(value crc, value buf, value pos, value len)
{
return caml_copy_int32(mz_crc32((uint32_t) Int32_val(crc),
&Byte_u(buf, Long_val(pos)),
Long_val(len)));
}
|
