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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 | /* inflate.c -- zlib interface to inflate modules
* Copyright (C) 1995-1998 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#include <linux/module.h>
#include <linux/zutil.h>
#include "infblock.h"
#include "infutil.h"
int zlib_inflate_workspacesize(void)
{
return sizeof(struct inflate_workspace);
}
int zlib_inflateReset(
z_streamp z
)
{
if (z == NULL || z->state == NULL || z->workspace == NULL)
return Z_STREAM_ERROR;
z->total_in = z->total_out = 0;
z->msg = NULL;
z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
zlib_inflate_blocks_reset(z->state->blocks, z, NULL);
return Z_OK;
}
int zlib_inflateEnd(
z_streamp z
)
{
if (z == NULL || z->state == NULL || z->workspace == NULL)
return Z_STREAM_ERROR;
if (z->state->blocks != NULL)
zlib_inflate_blocks_free(z->state->blocks, z);
z->state = NULL;
return Z_OK;
}
int zlib_inflateInit2_(
z_streamp z,
int w,
const char *version,
int stream_size
)
{
if (version == NULL || version[0] != ZLIB_VERSION[0] ||
stream_size != sizeof(z_stream) || z->workspace == NULL)
return Z_VERSION_ERROR;
/* initialize state */
z->msg = NULL;
z->state = &WS(z)->internal_state;
z->state->blocks = NULL;
/* handle undocumented nowrap option (no zlib header or check) */
z->state->nowrap = 0;
if (w < 0)
{
w = - w;
z->state->nowrap = 1;
}
/* set window size */
if (w < 8 || w > 15)
{
zlib_inflateEnd(z);
return Z_STREAM_ERROR;
}
z->state->wbits = (uInt)w;
/* create inflate_blocks state */
if ((z->state->blocks =
zlib_inflate_blocks_new(z, z->state->nowrap ? NULL : zlib_adler32, (uInt)1 << w))
== NULL)
{
zlib_inflateEnd(z);
return Z_MEM_ERROR;
}
/* reset state */
zlib_inflateReset(z);
return Z_OK;
}
/*
* At the end of a Deflate-compressed PPP packet, we expect to have seen
* a `stored' block type value but not the (zero) length bytes.
*/
static int zlib_inflate_packet_flush(inflate_blocks_statef *s)
{
if (s->mode != LENS)
return Z_DATA_ERROR;
s->mode = TYPE;
return Z_OK;
}
int zlib_inflateInit_(
z_streamp z,
const char *version,
int stream_size
)
{
return zlib_inflateInit2_(z, DEF_WBITS, version, stream_size);
}
#undef NEEDBYTE
#undef NEXTBYTE
#define NEEDBYTE {if(z->avail_in==0)goto empty;r=trv;}
#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
int zlib_inflate(
z_streamp z,
int f
)
{
int r, trv;
uInt b;
if (z == NULL || z->state == NULL || z->next_in == NULL)
return Z_STREAM_ERROR;
trv = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
r = Z_BUF_ERROR;
while (1) switch (z->state->mode)
{
case METHOD:
NEEDBYTE
if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
{
z->state->mode = I_BAD;
z->msg = (char*)"unknown compression method";
z->state->sub.marker = 5; /* can't try inflateSync */
break;
}
if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
{
z->state->mode = I_BAD;
z->msg = (char*)"invalid window size";
z->state->sub.marker = 5; /* can't try inflateSync */
break;
}
z->state->mode = FLAG;
case FLAG:
NEEDBYTE
b = NEXTBYTE;
if (((z->state->sub.method << 8) + b) % 31)
{
z->state->mode = I_BAD;
z->msg = (char*)"incorrect header check";
z->state->sub.marker = 5; /* can't try inflateSync */
break;
}
if (!(b & PRESET_DICT))
{
z->state->mode = BLOCKS;
break;
}
z->state->mode = DICT4;
case DICT4:
NEEDBYTE
z->state->sub.check.need = (uLong)NEXTBYTE << 24;
z->state->mode = DICT3;
case DICT3:
NEEDBYTE
z->state->sub.check.need += (uLong)NEXTBYTE << 16;
z->state->mode = DICT2;
case DICT2:
NEEDBYTE
z->state->sub.check.need += (uLong)NEXTBYTE << 8;
z->state->mode = DICT1;
case DICT1:
NEEDBYTE
z->state->sub.check.need += (uLong)NEXTBYTE;
z->adler = z->state->sub.check.need;
z->state->mode = DICT0;
return Z_NEED_DICT;
case DICT0:
z->state->mode = I_BAD;
z->msg = (char*)"need dictionary";
z->state->sub.marker = 0; /* can try inflateSync */
return Z_STREAM_ERROR;
case BLOCKS:
r = zlib_inflate_blocks(z->state->blocks, z, r);
if (f == Z_PACKET_FLUSH && z->avail_in == 0 && z->avail_out != 0)
r = zlib_inflate_packet_flush(z->state->blocks);
if (r == Z_DATA_ERROR)
{
z->state->mode = I_BAD;
z->state->sub.marker = 0; /* can try inflateSync */
break;
}
if (r == Z_OK)
r = trv;
if (r != Z_STREAM_END)
return r;
r = trv;
zlib_inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
if (z->state->nowrap)
{
z->state->mode = I_DONE;
break;
}
z->state->mode = CHECK4;
case CHECK4:
NEEDBYTE
z->state->sub.check.need = (uLong)NEXTBYTE << 24;
z->state->mode = CHECK3;
case CHECK3:
NEEDBYTE
z->state->sub.check.need += (uLong)NEXTBYTE << 16;
z->state->mode = CHECK2;
case CHECK2:
NEEDBYTE
z->state->sub.check.need += (uLong)NEXTBYTE << 8;
z->state->mode = CHECK1;
case CHECK1:
NEEDBYTE
z->state->sub.check.need += (uLong)NEXTBYTE;
if (z->state->sub.check.was != z->state->sub.check.need)
{
z->state->mode = I_BAD;
z->msg = (char*)"incorrect data check";
z->state->sub.marker = 5; /* can't try inflateSync */
break;
}
z->state->mode = I_DONE;
case I_DONE:
return Z_STREAM_END;
case I_BAD:
return Z_DATA_ERROR;
default:
return Z_STREAM_ERROR;
}
empty:
if (f != Z_PACKET_FLUSH)
return r;
z->state->mode = I_BAD;
z->msg = (char *)"need more for packet flush";
z->state->sub.marker = 0; /* can try inflateSync */
return Z_DATA_ERROR;
}
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