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zlib 0.92

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This commit is contained in:
Mark Adler
2011-09-09 23:08:07 -07:00
parent 1c71d8b13b
commit bdde4e09d2
25 changed files with 884 additions and 910 deletions
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136
inffast.c
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@@ -35,19 +35,19 @@ inflate_huft *tl, *td;
struct inflate_blocks_state *s;
z_stream *z;
{
inflate_huft *t; /* temporary pointer */
int e; /* extra bits or operation */
uLong b; /* bit buffer */
uInt k; /* bits in bit buffer */
Byte *p; /* input data pointer */
uInt n; /* bytes available there */
Byte *q; /* output window write pointer */
uInt m; /* bytes to end of window or read pointer */
uInt ml; /* mask for literal/length tree */
uInt md; /* mask for distance tree */
uInt c; /* bytes to copy */
uInt d; /* distance back to copy from */
Byte *r; /* copy source pointer */
inflate_huft *t; /* temporary pointer */
int e; /* extra bits or operation */
uLong b; /* bit buffer */
uInt k; /* bits in bit buffer */
Byte *p; /* input data pointer */
uInt n; /* bytes available there */
Byte *q; /* output window write pointer */
uInt m; /* bytes to end of window or read pointer */
uInt ml; /* mask for literal/length tree */
uInt md; /* mask for distance tree */
uInt c; /* bytes to copy */
uInt d; /* distance back to copy from */
Byte *r; /* copy source pointer */
/* load input, output, bit values */
LOAD
@@ -57,40 +57,40 @@ z_stream *z;
md = inflate_mask[bd];
/* do until not enough input or output space for fast loop */
do { /* assume called with m >= 258 && n >= 10 */
do { /* assume called with m >= 258 && n >= 10 */
/* get literal/length code */
GRABBITS(20) /* max bits for literal/length code */
GRABBITS(20) /* max bits for literal/length code */
if ((e = (t = tl + ((uInt)b & ml))->exop) < 0)
do {
if (e == -128)
{
z->msg = "invalid literal/length code";
if (e == -128)
{
z->msg = "invalid literal/length code";
UNGRAB
UPDATE
return Z_DATA_ERROR;
}
DUMPBITS(t->bits)
e = -e;
if (e & 64) /* end of block */
{
Tracevv((stderr, "inflate: * end of block\n"));
UPDATE
return Z_DATA_ERROR;
}
DUMPBITS(t->bits)
e = -e;
if (e & 64) /* end of block */
{
Tracevv((stderr, "inflate: * end of block\n"));
UNGRAB
UPDATE
return Z_STREAM_END;
}
UPDATE
return Z_STREAM_END;
}
} while ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) < 0);
DUMPBITS(t->bits)
/* process literal or length (end of block already trapped) */
if (e & 16) /* then it's a literal */
if (e & 16) /* then it's a literal */
{
Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ?
"inflate: * literal '%c'\n" :
"inflate: * literal 0x%02x\n", t->base));
"inflate: * literal '%c'\n" :
"inflate: * literal 0x%02x\n", t->base));
*q++ = (Byte)t->base;
m--;
}
else /* it's a length */
else /* it's a length */
{
/* get length of block to copy (already have extra bits) */
c = t->base + ((uInt)b & inflate_mask[e]);
@@ -98,53 +98,53 @@ z_stream *z;
Tracevv((stderr, "inflate: * length %u\n", c));
/* decode distance base of block to copy */
GRABBITS(15); /* max bits for distance code */
GRABBITS(15); /* max bits for distance code */
if ((e = (t = td + ((uInt)b & md))->exop) < 0)
do {
if (e == -128)
{
z->msg = "invalid distance code";
UNGRAB
UPDATE
return Z_DATA_ERROR;
}
DUMPBITS(t->bits)
e = -e;
} while ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) < 0);
do {
if (e == -128)
{
z->msg = "invalid distance code";
UNGRAB
UPDATE
return Z_DATA_ERROR;
}
DUMPBITS(t->bits)
e = -e;
} while ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) < 0);
DUMPBITS(t->bits)
/* get extra bits to add to distance base */
GRABBITS((uInt)e) /* get extra bits (up to 13) */
GRABBITS((uInt)e) /* get extra bits (up to 13) */
d = t->base + ((uInt)b & inflate_mask[e]);
DUMPBITS(e)
Tracevv((stderr, "inflate: * distance %u\n", d));
/* do the copy */
m -= c;
if ((uInt)(q - s->window) >= d) /* if offset before destination, */
{ /* just copy */
r = q - d;
*q++ = *r++; c--; /* minimum count is three, */
*q++ = *r++; c--; /* so unroll loop a little */
do {
*q++ = *r++;
} while (--c);
if ((uInt)(q - s->window) >= d) /* if offset before destination, */
{ /* just copy */
r = q - d;
*q++ = *r++; c--; /* minimum count is three, */
*q++ = *r++; c--; /* so unroll loop a little */
do {
*q++ = *r++;
} while (--c);
}
else /* else offset after destination */
else /* else offset after destination */
{
e = d - (q - s->window); /* bytes from offset to end */
r = s->end - e; /* pointer to offset */
if (c > (uInt)e) /* if source crosses, */
{
c -= e; /* copy to end of window */
do {
*q++ = *r++;
} while (--e);
r = s->window; /* copy rest from start of window */
}
do { /* copy all or what's left */
*q++ = *r++;
} while (--c);
e = d - (q - s->window); /* bytes from offset to end */
r = s->end - e; /* pointer to offset */
if (c > (uInt)e) /* if source crosses, */
{
c -= e; /* copy to end of window */
do {
*q++ = *r++;
} while (--e);
r = s->window; /* copy rest from start of window */
}
do { /* copy all or what's left */
*q++ = *r++;
} while (--c);
}
}
} while (m >= 258 && n >= 10);