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Diffstat (limited to 'src/lib/libcrypto/comp/c_zlib.c')
-rw-r--r--src/lib/libcrypto/comp/c_zlib.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/src/lib/libcrypto/comp/c_zlib.c b/src/lib/libcrypto/comp/c_zlib.c
new file mode 100644
index 0000000000..1bd2850d15
--- /dev/null
+++ b/src/lib/libcrypto/comp/c_zlib.c
@@ -0,0 +1,271 @@
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <openssl/objects.h>
5#include <openssl/comp.h>
6#include <openssl/err.h>
7
8COMP_METHOD *COMP_zlib(void );
9
10static COMP_METHOD zlib_method_nozlib={
11 NID_undef,
12 "(undef)",
13 NULL,
14 NULL,
15 NULL,
16 NULL,
17 NULL,
18 NULL,
19 };
20
21#ifndef ZLIB
22#undef ZLIB_SHARED
23#else
24
25#include <zlib.h>
26
27static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
28 unsigned int olen, unsigned char *in, unsigned int ilen);
29static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
30 unsigned int olen, unsigned char *in, unsigned int ilen);
31
32static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
33 uLong sourceLen);
34
35static COMP_METHOD zlib_method={
36 NID_zlib_compression,
37 LN_zlib_compression,
38 NULL,
39 NULL,
40 zlib_compress_block,
41 zlib_expand_block,
42 NULL,
43 NULL,
44 };
45
46/*
47 * When OpenSSL is built on Windows, we do not want to require that
48 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
49 * work. Therefore, all ZLIB routines are loaded at run time
50 * and we do not link to a .LIB file.
51 */
52#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
53# include <windows.h>
54
55# define Z_CALLCONV _stdcall
56# define ZLIB_SHARED
57#else
58# define Z_CALLCONV
59#endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
60
61#ifdef ZLIB_SHARED
62#include <openssl/dso.h>
63
64/* Prototypes for built in stubs */
65static int stub_compress(Bytef *dest,uLongf *destLen,
66 const Bytef *source, uLong sourceLen);
67static int stub_inflateEnd(z_streamp strm);
68static int stub_inflate(z_streamp strm, int flush);
69static int stub_inflateInit_(z_streamp strm, const char * version,
70 int stream_size);
71
72/* Function pointers */
73typedef int (Z_CALLCONV *compress_ft)(Bytef *dest,uLongf *destLen,
74 const Bytef *source, uLong sourceLen);
75typedef int (Z_CALLCONV *inflateEnd_ft)(z_streamp strm);
76typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
77typedef int (Z_CALLCONV *inflateInit__ft)(z_streamp strm,
78 const char * version, int stream_size);
79static compress_ft p_compress=NULL;
80static inflateEnd_ft p_inflateEnd=NULL;
81static inflate_ft p_inflate=NULL;
82static inflateInit__ft p_inflateInit_=NULL;
83
84static int zlib_loaded = 0; /* only attempt to init func pts once */
85static DSO *zlib_dso = NULL;
86
87#define compress stub_compress
88#define inflateEnd stub_inflateEnd
89#define inflate stub_inflate
90#define inflateInit_ stub_inflateInit_
91#endif /* ZLIB_SHARED */
92
93static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
94 unsigned int olen, unsigned char *in, unsigned int ilen)
95 {
96 unsigned long l;
97 int i;
98 int clear=1;
99
100 if (ilen > 128)
101 {
102 out[0]=1;
103 l=olen-1;
104 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
105 if (i != Z_OK)
106 return(-1);
107 if (ilen > l)
108 {
109 clear=0;
110 l++;
111 }
112 }
113 if (clear)
114 {
115 out[0]=0;
116 memcpy(&(out[1]),in,ilen);
117 l=ilen+1;
118 }
119#ifdef DEBUG_ZLIB
120 fprintf(stderr,"compress(%4d)->%4d %s\n",
121 ilen,(int)l,(clear)?"clear":"zlib");
122#endif
123 return((int)l);
124 }
125
126static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
127 unsigned int olen, unsigned char *in, unsigned int ilen)
128 {
129 unsigned long l;
130 int i;
131
132 if (in[0])
133 {
134 l=olen;
135 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
136 if (i != Z_OK)
137 return(-1);
138 }
139 else
140 {
141 memcpy(out,&(in[1]),ilen-1);
142 l=ilen-1;
143 }
144#ifdef DEBUG_ZLIB
145 fprintf(stderr,"expand (%4d)->%4d %s\n",
146 ilen,(int)l,in[0]?"zlib":"clear");
147#endif
148 return((int)l);
149 }
150
151static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
152 uLong sourceLen)
153{
154 z_stream stream;
155 int err;
156
157 stream.next_in = (Bytef*)source;
158 stream.avail_in = (uInt)sourceLen;
159 /* Check for source > 64K on 16-bit machine: */
160 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
161
162 stream.next_out = dest;
163 stream.avail_out = (uInt)*destLen;
164 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
165
166 stream.zalloc = (alloc_func)0;
167 stream.zfree = (free_func)0;
168
169 err = inflateInit(&stream);
170 if (err != Z_OK) return err;
171
172 err = inflate(&stream, Z_FINISH);
173 if (err != Z_STREAM_END) {
174 inflateEnd(&stream);
175 return err;
176 }
177 *destLen = stream.total_out;
178
179 err = inflateEnd(&stream);
180 return err;
181}
182
183#endif
184
185COMP_METHOD *COMP_zlib(void)
186 {
187 COMP_METHOD *meth = &zlib_method_nozlib;
188
189#ifdef ZLIB_SHARED
190 if (!zlib_loaded)
191 {
192#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
193 zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
194 if (!zlib_dso)
195 {
196 zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
197 if (zlib_dso)
198 {
199 /* Clear the errors from the first failed
200 DSO_load() */
201 ERR_clear_error();
202 }
203 }
204#else
205 zlib_dso = DSO_load(NULL, "z", NULL, 0);
206#endif
207 if (zlib_dso != NULL)
208 {
209 p_compress
210 = (compress_ft) DSO_bind_func(zlib_dso,
211 "compress");
212 p_inflateEnd
213 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
214 "inflateEnd");
215 p_inflate
216 = (inflate_ft) DSO_bind_func(zlib_dso,
217 "inflate");
218 p_inflateInit_
219 = (inflateInit__ft) DSO_bind_func(zlib_dso,
220 "inflateInit_");
221 zlib_loaded++;
222 }
223 }
224
225#endif
226#if defined(ZLIB) || defined(ZLIB_SHARED)
227 meth = &zlib_method;
228#endif
229
230 return(meth);
231 }
232
233#ifdef ZLIB_SHARED
234/* Stubs for each function to be dynamicly loaded */
235static int
236stub_compress(Bytef *dest,uLongf *destLen,const Bytef *source, uLong sourceLen)
237 {
238 if (p_compress)
239 return(p_compress(dest,destLen,source,sourceLen));
240 else
241 return(Z_MEM_ERROR);
242 }
243
244static int
245stub_inflateEnd(z_streamp strm)
246 {
247 if ( p_inflateEnd )
248 return(p_inflateEnd(strm));
249 else
250 return(Z_MEM_ERROR);
251 }
252
253static int
254stub_inflate(z_streamp strm, int flush)
255 {
256 if ( p_inflate )
257 return(p_inflate(strm,flush));
258 else
259 return(Z_MEM_ERROR);
260 }
261
262static int
263stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
264 {
265 if ( p_inflateInit_ )
266 return(p_inflateInit_(strm,version,stream_size));
267 else
268 return(Z_MEM_ERROR);
269 }
270
271#endif /* ZLIB_SHARED */
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