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Added util function getcto().

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committer: mfx <mfx> 978792675 +0000
This commit is contained in:
Markus F.X.J. Oberhumer
2001-01-06 14:51:15 +00:00
parent 766b3edeee
commit daa0fe353b
7 changed files with 103 additions and 135 deletions
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src/filter/cto.h
+6 -44
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@@ -44,64 +44,27 @@ static int F(Filter *f)
const unsigned size = f->buf_len;
unsigned ic, jc, kc;
unsigned cto;
unsigned char cto8;
unsigned calls = 0, noncalls = 0, noncalls2 = 0;
unsigned lastnoncall = size, lastcall = 0;
// find a 16MB large empty address space
if (f->forced_cto >= 0 && f->forced_cto <= 255)
cto8 = (unsigned char) f->forced_cto;
else
{
unsigned char buf[256];
memset(buf,0,256);
#if 1
for (ic = 0; ic < size - 5; ic++)
if (COND(b,ic) && get_le32(b+ic+1)+ic+1 >= size)
{
buf[b[ic+1]] |= 1;
}
#else
{
int i = size - 6;
do {
if (COND(b,i) && get_le32(b+i+1)+i+1 >= size)
buf[b[i+1]] |= 1;
} while (--i >= 0);
}
#endif
ic = 256;
if (f->preferred_ctos)
{
for (const int *pc = f->preferred_ctos; *pc >= 0; pc++)
{
if (buf[*pc & 255] == 0)
{
ic = *pc & 255;
break;
}
}
}
#if 0
// just a test to see if certain ctos would improve compression
if (ic >= 256)
for (ic = 0; ic < 256; ic += 16)
if (buf[ic] == 0)
break;
#endif
if (ic >= 256)
for (ic = 0; ic < 256; ic++)
if (buf[ic] == 0)
break;
if (ic >= 256)
//throwCantPack("call trick problem");
if (getcto(f, buf) < 0)
return -1;
cto8 = (unsigned char) ic;
}
cto = (unsigned)cto8 << 24;
const unsigned char cto8 = f->cto;
#ifdef U
const unsigned cto = (unsigned)f->cto << 24;
#endif
for (ic = 0; ic < size - 5; ic++)
{
@@ -145,7 +108,6 @@ static int F(Filter *f)
}
}
f->cto = cto8;
f->calls = calls;
f->noncalls = noncalls;
f->lastcall = lastcall;
@@ -167,7 +129,7 @@ static int U(Filter *f)
upx_byte *b = f->buf;
const unsigned size5 = f->buf_len - 5;
const unsigned addvalue = f->addvalue;
const unsigned cto = f->cto << 24;
const unsigned cto = (unsigned)f->cto << 24;
unsigned ic, jc;