void CZipArchive::LoadFollowers()
{
for (int x = 255; x >= 0; x--)
{
READBIT(6, Slen[x]);
for (int i = 0; (BYTE) i < Slen[x]; i++)
{
READBIT(8, followers[x][i]);
}
}
}
// If the area is bogus, this may still print a name, but it shouldn't crash.
static void printAreaName(uint16_t area)
{
uint16_t index;
uint8_t bitmask = AREA_BITMASK(area);
uint8_t bit;
for (bit = 0; bit < 8; bit++) {
if (READBIT(bitmask, bit)) {
break;
}
}
index = AREA_INDEX(area) * 8 + bit;
if (area != 0xFFFF
&& index < EMBER_AF_PRINT_NAME_NUMBER) {
emAfPrintf("%p:", names[index]);
}
}
void CZipArchive::unReduce()
/* expand probabilistically reduced data */
{
int lchar;
int nchar;
int ExState;
int V;
int Len;
factor = lrec.compression_method - 1;
ExState = 0;
lchar = 0;
LoadFollowers();
while (((outpos + outcnt) < ucsize) && (!zipeof))
{
if (Slen[lchar] == 0)
READBIT(8, nchar) /* ; */
else {
READBIT(1, nchar);
if (nchar != 0)
READBIT(8, nchar) /* ; */
else {
int follower;
int bitsneeded = B_table[Slen[lchar]];
READBIT(bitsneeded, follower);
nchar = followers[lchar][follower];
}
}
/* expand the resulting byte */
switch (ExState)
{
case 0:
if (nchar != DLE)
OUTB(nchar);
else
ExState = 1;
break;
case 1:
if (nchar != 0) {
V = nchar;
Len = V & L_table[factor];
if (Len == L_table[factor])
ExState = 2;
else
ExState = 3;
} else {
OUTB(DLE);
ExState = 0;
}
break;
case 2:{
Len += nchar;
ExState = 3;
}
break;
case 3:{
int i = Len + 3;
int offset = (((V >> D_shift[factor]) &
D_mask[factor]) << 8) + nchar + 1;
long int op = (outpos + outcnt) - offset;
/* special case- before start of file */
while ((op < 0L) && (i > 0)) {
OUTB(0);
op++;
i--;
}
/* normal copy of data from output buffer */
{
register int ix = (int) (op % OUTBUFSIZ);
/* do a block memory copy if possible */
if (((ix + i) < OUTBUFSIZ) &&
((outcnt + i) < OUTBUFSIZ)) {
memcpy(outptr, &outbuf[ix], i);
outptr += i;
outcnt += i;
}
/* otherwise copy byte by byte */
else
while (i--) {
OUTB(outbuf[ix]);
if (++ix >= OUTBUFSIZ)
ix = 0;
}
}
ExState = 0;
}
break;
}
/* store character for next iteration */
lchar = nchar;
}
}