/src/skia/third_party/externals/freetype/src/gzip/inflate.c

Source (jump to first uncovered line)
/* inflate.c -- zlib interface to inflate modules
 * Copyright (C) 1995-2002 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "zutil.h"
#include "infblock.h"

#define  DONE  INFLATE_DONE
#define  BAD   INFLATE_BAD

typedef enum {
      METHOD,   /* waiting for method byte */
      FLAG,     /* waiting for flag byte */
      DICT4,    /* four dictionary check bytes to go */
      DICT3,    /* three dictionary check bytes to go */
      DICT2,    /* two dictionary check bytes to go */
      DICT1,    /* one dictionary check byte to go */
      DICT0,    /* waiting for inflateSetDictionary */
      BLOCKS,   /* decompressing blocks */
      CHECK4,   /* four check bytes to go */
      CHECK3,   /* three check bytes to go */
      CHECK2,   /* two check bytes to go */
      CHECK1,   /* one check byte to go */
      DONE,     /* finished check, done */
      BAD}      /* got an error--stay here */
inflate_mode;

/* inflate private state */
struct internal_state {

  /* mode */
  inflate_mode  mode;   /* current inflate mode */

  /* mode dependent information */
  union {
    uInt method;        /* if FLAGS, method byte */
    struct {
      uLong was;                /* computed check value */
      uLong need;               /* stream check value */
    } check;            /* if CHECK, check values to compare */
    uInt marker;        /* if BAD, inflateSync's marker bytes count */
  } sub;        /* submode */

  /* mode independent information */
  int  nowrap;          /* flag for no wrapper */
  uInt wbits;           /* log2(window size)  (8..15, defaults to 15) */
  inflate_blocks_statef
    *blocks;            /* current inflate_blocks state */

};


ZEXPORT(int) inflateReset( /* z) */
z_streamp z )
{
  if (z == Z_NULL || z->state == Z_NULL)
    return Z_STREAM_ERROR;
  z->total_in = z->total_out = 0;
  z->msg = Z_NULL;
  z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
  inflate_blocks_reset(z->state->blocks, z, Z_NULL);
  Tracev((stderr, "inflate: reset\n"));
  return Z_OK;
}


ZEXPORT(int) inflateEnd( /* z) */
z_streamp z )
{
  if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
    return Z_STREAM_ERROR;
  if (z->state->blocks != Z_NULL)
    inflate_blocks_free(z->state->blocks, z);
  ZFREE(z, z->state);
  z->state = Z_NULL;
  Tracev((stderr, "inflate: end\n"));
  return Z_OK;
}


ZEXPORT(int) inflateInit2_( /* z, w, version, stream_size) */
z_streamp z,
int w,
const char *version,
int stream_size )
{
  if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
      stream_size != sizeof(z_stream))
      return Z_VERSION_ERROR;

  /* initialize state */
  if (z == Z_NULL)
    return Z_STREAM_ERROR;
  z->msg = Z_NULL;
  if (z->zalloc == Z_NULL)
  {
    z->zalloc = zcalloc;
    z->opaque = (voidpf)0;
  }
  if (z->zfree == Z_NULL) z->zfree = zcfree;
  if ((z->state = (struct internal_state FAR *)
       ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
    return Z_MEM_ERROR;
  z->state->blocks = Z_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)
  {
    inflateEnd(z);
    return Z_STREAM_ERROR;
  }
  z->state->wbits = (uInt)w;

  /* create inflate_blocks state */
  if ((z->state->blocks =
      inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, (uInt)1 << w))
      == Z_NULL)
  {
    inflateEnd(z);
    return Z_MEM_ERROR;
  }
  Tracev((stderr, "inflate: allocated\n"));

  /* reset state */
  inflateReset(z);
  return Z_OK;
}



#undef  NEEDBYTE
#define NEEDBYTE {if(z->avail_in==0)return r;r=f;}

#undef  NEXTBYTE
#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)


ZEXPORT(int) inflate( /* z, f) */
z_streamp z,
int f )
{
  int r;
  uInt b;

  if (z == Z_NULL || z->state == Z_NULL || z->next_in == Z_NULL)
    return Z_STREAM_ERROR;
  f = 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 = 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 = BAD;
        z->msg = (char*)"invalid window size";
        z->state->sub.marker = 5;       /* can't try inflateSync */
        break;
      }
      z->state->mode = FLAG;
      /* fall through */
    case FLAG:
      NEEDBYTE
      b = NEXTBYTE;
      if (((z->state->sub.method << 8) + b) % 31)
      {
        z->state->mode = BAD;
        z->msg = (char*)"incorrect header check";
        z->state->sub.marker = 5;       /* can't try inflateSync */
        break;
      }
      Tracev((stderr, "inflate: zlib header ok\n"));
      if (!(b & PRESET_DICT))
      {
        z->state->mode = BLOCKS;
        break;
      }
      z->state->mode = DICT4;
      /* fall through */
    case DICT4:
      NEEDBYTE
      z->state->sub.check.need = (uLong)NEXTBYTE << 24;
      z->state->mode = DICT3;
      /* fall through */
    case DICT3:
      NEEDBYTE
      z->state->sub.check.need += (uLong)NEXTBYTE << 16;
      z->state->mode = DICT2;
      /* fall through */
    case DICT2:
      NEEDBYTE
      z->state->sub.check.need += (uLong)NEXTBYTE << 8;
      z->state->mode = DICT1;
      /* fall through */
    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 = BAD;
      z->msg = (char*)"need dictionary";
      z->state->sub.marker = 0;       /* can try inflateSync */
      return Z_STREAM_ERROR;
    case BLOCKS:
      r = inflate_blocks(z->state->blocks, z, r);
      if (r == Z_DATA_ERROR)
      {
        z->state->mode = BAD;
        z->state->sub.marker = 0;       /* can try inflateSync */
        break;
      }
      if (r == Z_OK)
        r = f;
      if (r != Z_STREAM_END)
        return r;
      r = f;
      inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
      if (z->state->nowrap)
      {
        z->state->mode = DONE;
        break;
      }
      z->state->mode = CHECK4;
      /* fall through */
    case CHECK4:
      NEEDBYTE
      z->state->sub.check.need = (uLong)NEXTBYTE << 24;
      z->state->mode = CHECK3;
      /* fall through */
    case CHECK3:
      NEEDBYTE
      z->state->sub.check.need += (uLong)NEXTBYTE << 16;
      z->state->mode = CHECK2;
      /* fall through */
    case CHECK2:
      NEEDBYTE
      z->state->sub.check.need += (uLong)NEXTBYTE << 8;
      z->state->mode = CHECK1;
      /* fall through */
    case CHECK1:
      NEEDBYTE
      z->state->sub.check.need += (uLong)NEXTBYTE;

      if (z->state->sub.check.was != z->state->sub.check.need)
      {
        z->state->mode = BAD;
        z->msg = (char*)"incorrect data check";
        z->state->sub.marker = 5;       /* can't try inflateSync */
        break;
      }
      Tracev((stderr, "inflate: zlib check ok\n"));
      z->state->mode = DONE;
      /* fall through */
    case DONE:
      return Z_STREAM_END;
    case BAD:
      return Z_DATA_ERROR;
    default:
      return Z_STREAM_ERROR;
  }
#ifdef NEED_DUMMY_RETURN
  return Z_STREAM_ERROR;  /* Some dumb compilers complain without this */
#endif
}


Coverage Report

Created: 2021-08-22 09:07

Line	Count	Source (jump to first uncovered line)
1		/* inflate.c -- zlib interface to inflate modules
2		* Copyright (C) 1995-2002 Mark Adler
3		* For conditions of distribution and use, see copyright notice in zlib.h
4		*/
5
6		#include "zutil.h"
7		#include "infblock.h"
8
9	0	#define DONE INFLATE_DONE
10	0	#define BAD INFLATE_BAD
11
12		typedef enum {
13		METHOD, /* waiting for method byte */
14		FLAG, /* waiting for flag byte */
15		DICT4, /* four dictionary check bytes to go */
16		DICT3, /* three dictionary check bytes to go */
17		DICT2, /* two dictionary check bytes to go */
18		DICT1, /* one dictionary check byte to go */
19		DICT0, /* waiting for inflateSetDictionary */
20		BLOCKS, /* decompressing blocks */
21		CHECK4, /* four check bytes to go */
22		CHECK3, /* three check bytes to go */
23		CHECK2, /* two check bytes to go */
24		CHECK1, /* one check byte to go */
25		DONE, /* finished check, done */
26		BAD} /* got an error--stay here */
27		inflate_mode;
28
29		/* inflate private state */
30		struct internal_state {
31
32		/* mode */
33		inflate_mode mode; /* current inflate mode */
34
35		/* mode dependent information */
36		union {
37		uInt method; /* if FLAGS, method byte */
38		struct {
39		uLong was; /* computed check value */
40		uLong need; /* stream check value */
41		} check; /* if CHECK, check values to compare */
42		uInt marker; /* if BAD, inflateSync's marker bytes count */
43		} sub; /* submode */
44
45		/* mode independent information */
46		int nowrap; /* flag for no wrapper */
47		uInt wbits; /* log2(window size) (8..15, defaults to 15) */
48		inflate_blocks_statef
49		blocks; / current inflate_blocks state */
50
51		};
52
53
54		ZEXPORT(int) inflateReset( /* z) */
55		z_streamp z )
56	0	{
57	0	if (z == Z_NULL \|\| z->state == Z_NULL)
58	0	return Z_STREAM_ERROR;
59	0	z->total_in = z->total_out = 0;
60	0	z->msg = Z_NULL;
61	0	z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
62	0	inflate_blocks_reset(z->state->blocks, z, Z_NULL);
63	0	Tracev((stderr, "inflate: reset\n"));
64	0	return Z_OK;
65	0	}
66
67
68		ZEXPORT(int) inflateEnd( /* z) */
69		z_streamp z )
70	0	{
71	0	if (z == Z_NULL \|\| z->state == Z_NULL \|\| z->zfree == Z_NULL)
72	0	return Z_STREAM_ERROR;
73	0	if (z->state->blocks != Z_NULL)
74	0	inflate_blocks_free(z->state->blocks, z);
75	0	ZFREE(z, z->state);
76	0	z->state = Z_NULL;
77	0	Tracev((stderr, "inflate: end\n"));
78	0	return Z_OK;
79	0	}
80
81
82		ZEXPORT(int) inflateInit2_( /* z, w, version, stream_size) */
83		z_streamp z,
84		int w,
85		const char *version,
86		int stream_size )
87	0	{
88	0	if (version == Z_NULL \|\| version[0] != ZLIB_VERSION[0] \|\|
89	0	stream_size != sizeof(z_stream))
90	0	return Z_VERSION_ERROR;
91
92		/* initialize state */
93	0	if (z == Z_NULL)
94	0	return Z_STREAM_ERROR;
95	0	z->msg = Z_NULL;
96	0	if (z->zalloc == Z_NULL)
97	0	{
98	0	z->zalloc = zcalloc;
99	0	z->opaque = (voidpf)0;
100	0	}
101	0	if (z->zfree == Z_NULL) z->zfree = zcfree;
102	0	if ((z->state = (struct internal_state FAR *)
103	0	ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
104	0	return Z_MEM_ERROR;
105	0	z->state->blocks = Z_NULL;
106
107		/* handle undocumented nowrap option (no zlib header or check) */
108	0	z->state->nowrap = 0;
109	0	if (w < 0)
110	0	{
111	0	w = - w;
112	0	z->state->nowrap = 1;
113	0	}
114
115		/* set window size */
116	0	if (w < 8 \|\| w > 15)
117	0	{
118	0	inflateEnd(z);
119	0	return Z_STREAM_ERROR;
120	0	}
121	0	z->state->wbits = (uInt)w;
122
123		/* create inflate_blocks state */
124	0	if ((z->state->blocks =
125	0	inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, (uInt)1 << w))
126	0	== Z_NULL)
127	0	{
128	0	inflateEnd(z);
129	0	return Z_MEM_ERROR;
130	0	}
131	0	Tracev((stderr, "inflate: allocated\n"));
132
133		/* reset state */
134	0	inflateReset(z);
135	0	return Z_OK;
136	0	}
137
138
139
140		#undef NEEDBYTE
141	0	#define NEEDBYTE {if(z->avail_in==0)return r;r=f;}
142
143		#undef NEXTBYTE
144	0	#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
145
146
147		ZEXPORT(int) inflate( /* z, f) */
148		z_streamp z,
149		int f )
150	0	{
151	0	int r;
152	0	uInt b;
153
154	0	if (z == Z_NULL \|\| z->state == Z_NULL \|\| z->next_in == Z_NULL)
155	0	return Z_STREAM_ERROR;
156	0	f = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
157	0	r = Z_BUF_ERROR;
158	0	while (1) switch (z->state->mode)
159	0	{
160	0	case METHOD:
161	0	NEEDBYTE
162	0	if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
163	0	{
164	0	z->state->mode = BAD;
165	0	z->msg = (char*)"unknown compression method";
166	0	z->state->sub.marker = 5; /* can't try inflateSync */
167	0	break;
168	0	}
169	0	if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
170	0	{
171	0	z->state->mode = BAD;
172	0	z->msg = (char*)"invalid window size";
173	0	z->state->sub.marker = 5; /* can't try inflateSync */
174	0	break;
175	0	}
176	0	z->state->mode = FLAG;
177		/* fall through */
178	0	case FLAG:
179	0	NEEDBYTE
180	0	b = NEXTBYTE;
181	0	if (((z->state->sub.method << 8) + b) % 31)
182	0	{
183	0	z->state->mode = BAD;
184	0	z->msg = (char*)"incorrect header check";
185	0	z->state->sub.marker = 5; /* can't try inflateSync */
186	0	break;
187	0	}
188	0	Tracev((stderr, "inflate: zlib header ok\n"));
189	0	if (!(b & PRESET_DICT))
190	0	{
191	0	z->state->mode = BLOCKS;
192	0	break;
193	0	}
194	0	z->state->mode = DICT4;
195		/* fall through */
196	0	case DICT4:
197	0	NEEDBYTE
198	0	z->state->sub.check.need = (uLong)NEXTBYTE << 24;
199	0	z->state->mode = DICT3;
200		/* fall through */
201	0	case DICT3:
202	0	NEEDBYTE
203	0	z->state->sub.check.need += (uLong)NEXTBYTE << 16;
204	0	z->state->mode = DICT2;
205		/* fall through */
206	0	case DICT2:
207	0	NEEDBYTE
208	0	z->state->sub.check.need += (uLong)NEXTBYTE << 8;
209	0	z->state->mode = DICT1;
210		/* fall through */
211	0	case DICT1:
212	0	NEEDBYTE
213	0	z->state->sub.check.need += (uLong)NEXTBYTE;
214	0	z->adler = z->state->sub.check.need;
215	0	z->state->mode = DICT0;
216	0	return Z_NEED_DICT;
217	0	case DICT0:
218	0	z->state->mode = BAD;
219	0	z->msg = (char*)"need dictionary";
220	0	z->state->sub.marker = 0; /* can try inflateSync */
221	0	return Z_STREAM_ERROR;
222	0	case BLOCKS:
223	0	r = inflate_blocks(z->state->blocks, z, r);
224	0	if (r == Z_DATA_ERROR)
225	0	{
226	0	z->state->mode = BAD;
227	0	z->state->sub.marker = 0; /* can try inflateSync */
228	0	break;
229	0	}
230	0	if (r == Z_OK)
231	0	r = f;
232	0	if (r != Z_STREAM_END)
233	0	return r;
234	0	r = f;
235	0	inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
236	0	if (z->state->nowrap)
237	0	{
238	0	z->state->mode = DONE;
239	0	break;
240	0	}
241	0	z->state->mode = CHECK4;
242		/* fall through */
243	0	case CHECK4:
244	0	NEEDBYTE
245	0	z->state->sub.check.need = (uLong)NEXTBYTE << 24;
246	0	z->state->mode = CHECK3;
247		/* fall through */
248	0	case CHECK3:
249	0	NEEDBYTE
250	0	z->state->sub.check.need += (uLong)NEXTBYTE << 16;
251	0	z->state->mode = CHECK2;
252		/* fall through */
253	0	case CHECK2:
254	0	NEEDBYTE
255	0	z->state->sub.check.need += (uLong)NEXTBYTE << 8;
256	0	z->state->mode = CHECK1;
257		/* fall through */
258	0	case CHECK1:
259	0	NEEDBYTE
260	0	z->state->sub.check.need += (uLong)NEXTBYTE;
261
262	0	if (z->state->sub.check.was != z->state->sub.check.need)
263	0	{
264	0	z->state->mode = BAD;
265	0	z->msg = (char*)"incorrect data check";
266	0	z->state->sub.marker = 5; /* can't try inflateSync */
267	0	break;
268	0	}
269	0	Tracev((stderr, "inflate: zlib check ok\n"));
270	0	z->state->mode = DONE;
271		/* fall through */
272	0	case DONE:
273	0	return Z_STREAM_END;
274	0	case BAD:
275	0	return Z_DATA_ERROR;
276	0	default:
277	0	return Z_STREAM_ERROR;
278	0	}
279		#ifdef NEED_DUMMY_RETURN
280		return Z_STREAM_ERROR; /* Some dumb compilers complain without this */
281		#endif
282	0	}
283