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wxWidgets/utils/Install/sfxace/uac_dcpr.c
Bryan Petty f6bcfd974e merged 2.2 branch 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2000-07-15 19:51:35 +00:00

555 lines
10 KiB
C
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/* ------------------------------------------------------------------------ */
/* */
/* These are the decompression algorithms. */
/* Don't change here anything (apart from memory allocation perhaps). */
/* Any changes will very likely cause bugs! */
/* */
/* ------------------------------------------------------------------------ */
#include "os.h"
#if defined(AMIGA)
#include <string.h> // mem*()
#endif
#if defined(DOS) || defined(WIN16) || defined(WINNT) || defined(OS2) || defined(UNIX)
#if !defined(__CYGWIN__)
#include <mem.h> // mem*()
#endif
#endif
#include <stdio.h> // printf()
#include <stdlib.h> // malloc()
#include <string.h>
#include "globals.h"
#include "portable.h"
#include "uac_comm.h"
#include "uac_crc.h"
#include "uac_dcpr.h"
#include "uac_sys.h"
#ifdef CRYPT
#include "unace_ps.h"
#endif /* CRYPT */
//------------------------------ QUICKSORT ---------------------------------//
#define xchg_def(v1,v2) {INT dummy;\
dummy=v1; \
v1=v2; \
v2=dummy;}
void sortrange(INT left, INT right)
{
INT zl = left,
zr = right,
hyphen;
hyphen = sort_freq[right];
//divides by hyphen the given range into 2 parts
do
{
while (sort_freq[zl] > hyphen)
zl++;
while (sort_freq[zr] < hyphen)
zr--;
//found a too small (left side) and
//a too big (right side) element-->exchange them
if (zl <= zr)
{
xchg_def(sort_freq[zl], sort_freq[zr]);
xchg_def(sort_org[zl], sort_org[zr]);
zl++;
zr--;
}
}
while (zl < zr);
//sort partial ranges - when very small, sort directly
if (left < zr)
{
if (left < zr - 1)
sortrange(left, zr);
else if (sort_freq[left] < sort_freq[zr])
{
xchg_def(sort_freq[left], sort_freq[zr]);
xchg_def(sort_org[left], sort_org[zr]);
}
}
if (right > zl)
{
if (zl < right - 1)
sortrange(zl, right);
else if (sort_freq[zl] < sort_freq[right])
{
xchg_def(sort_freq[zl], sort_freq[right]);
xchg_def(sort_org[zl], sort_org[right]);
}
}
}
void quicksort(INT n)
{
INT i;
for (i = n + 1; i--;)
sort_org[i] = i;
sortrange(0, n);
}
//------------------------------ read bits ---------------------------------//
void readdat(void)
{
UINT i;
i = (size_rdb - 2) << 2;
rpos -= size_rdb - 2;
buf_rd[0] = buf_rd[size_rdb - 2];
buf_rd[1] = buf_rd[size_rdb - 1];
read_adds_blk((CHAR *) & buf_rd[2], i);
#ifdef HI_LO_BYTE_ORDER
{
ULONG *p;
i>>=2; // count LONGs not BYTEs
p=&buf_rd[2];
while (i--)
{
LONGswap(p);
p++;
}
}
#endif
}
#define addbits(bits) \
{ \
rpos+=(bits_rd+=bits)>>5; \
bits_rd&=31; \
if (rpos==(size_rdb-2)) readdat(); \
code_rd=(buf_rd[rpos] << bits_rd) \
+((buf_rd[rpos+1] >> (32-bits_rd))&(!bits_rd-1)); \
}
//---------------------- COMMENT DECOMPRESSION -----------------------------//
#define comm_cpr_hf(a,b) (a+b)
void dcpr_comm_init(void)
{
INT i;
i = comm_cpr_size > size_rdb * sizeof(LONG) ? size_rdb * sizeof(LONG) : comm_cpr_size;
if (!f_err)
memcpy(buf_rd, comm, i);
#ifdef HI_LO_BYTE_ORDER
{
ULONG *p;
i>>=2; // count LONGs not BYTEs
p=buf_rd;
while (i--)
{
LONGswap(p);
p++;
}
}
#endif
code_rd = buf_rd[0];
rpos = bits_rd = 0;
}
void dcpr_comm(INT comm_size)
{
SHORT hash[comm_cpr_hf(255, 255) + 1];
INT dpos = 0,
c,
pos = 0,
len,
hs;
memset(&hash, 0, sizeof(hash));
if (comm_cpr_size)
{
dcpr_comm_init();
len = code_rd >> (32 - 15);
addbits(15);
if (len >= comm_size)
len = comm_size - 1;
if (read_wd(maxwd_mn, dcpr_code_mn, dcpr_wd_mn, max_cd_mn))
do
{
if (dpos > 1)
{
pos = hash[hs = comm_cpr_hf(comm[dpos - 1], comm[dpos - 2])];
hash[hs] = dpos;
}
addbits(dcpr_wd_mn[(c = dcpr_code_mn[code_rd >> (32 - maxwd_mn)])]);
if (rpos == size_rdb - 3)
rpos = 0;
if (c > 255)
{
c -= 256;
c += 2;
while (c--)
comm[dpos++] = comm[pos++];
}
else
{
comm[dpos++] = c;
}
}
while (dpos < len);
comm[len] = 0;
}
}
//------------------------- LZW1 DECOMPRESSION -----------------------------//
void wrchar(CHAR ch)
{
dcpr_do++;
dcpr_text[dcpr_dpos] = ch;
dcpr_dpos++;
dcpr_dpos &= dcpr_dican;
}
void copystr(LONG d, INT l)
{
INT mpos;
dcpr_do += l;
mpos = dcpr_dpos - d;
mpos &= dcpr_dican;
if ((mpos >= dcpr_dicsiz - maxlength) || (dcpr_dpos >= dcpr_dicsiz - maxlength))
{
while (l--)
{
dcpr_text[dcpr_dpos] = dcpr_text[mpos];
dcpr_dpos++;
dcpr_dpos &= dcpr_dican;
mpos++;
mpos &= dcpr_dican;
}
}
else
{
while (l--)
dcpr_text[dcpr_dpos++] = dcpr_text[mpos++];
dcpr_dpos &= dcpr_dican;
}
}
void decompress(void)
{
INT c,
lg,
i,
k;
ULONG dist;
while (dcpr_do < dcpr_do_max)
{
if (!blocksize)
if (!calc_dectabs())
return;
addbits(dcpr_wd_mn[(c = dcpr_code_mn[code_rd >> (32 - maxwd_mn)])]);
blocksize--;
if (c > 255)
{
if (c > 259)
{
if ((c -= 260) > 1)
{
dist = (code_rd >> (33 - c)) + (1L << (c - 1));
addbits(c - 1);
}
else
dist = c;
dcpr_olddist[(dcpr_oldnum = (dcpr_oldnum + 1) & 3)] = dist;
i = 2;
if (dist > maxdis2)
{
i++;
if (dist > maxdis3)
i++;
}
}
else
{
dist = dcpr_olddist[(dcpr_oldnum - (c &= 255)) & 3];
for (k = c + 1; k--;)
dcpr_olddist[(dcpr_oldnum - k) & 3] = dcpr_olddist[(dcpr_oldnum - k + 1) & 3];
dcpr_olddist[dcpr_oldnum] = dist;
i = 2;
if (c > 1)
i++;
}
addbits(dcpr_wd_lg[(lg = dcpr_code_lg[code_rd >> (32 - maxwd_lg)])]);
dist++;
lg += i;
copystr(dist, lg);
}
else
wrchar(c);
}
}
//-------------------------- HUFFMAN ROUTINES ------------------------------//
INT makecode(UINT maxwd, UINT size1_t, UCHAR * wd, USHORT * code)
{
UINT maxc,
size2_t,
l,
c,
i,
max_make_code;
memcpy(&sort_freq, wd, (size1_t + 1) * sizeof(CHAR));
if (size1_t)
quicksort(size1_t);
else
sort_org[0] = 0;
sort_freq[size1_t + 1] = size2_t = c = 0;
while (sort_freq[size2_t])
size2_t++;
if (size2_t < 2)
{
i = sort_org[0];
wd[i] = 1;
size2_t += (size2_t == 0);
}
size2_t--;
max_make_code = 1 << maxwd;
for (i = size2_t + 1; i-- && c < max_make_code;)
{
maxc = 1 << (maxwd - sort_freq[i]);
l = sort_org[i];
if (c + maxc > max_make_code)
{
dcpr_do = dcpr_do_max;
return (0);
}
memset16(&code[c], l, maxc);
c += maxc;
}
return (1);
}
INT read_wd(UINT maxwd, USHORT * code, UCHAR * wd, INT max_el)
{
UINT c,
i,
j,
num_el,
l,
uplim,
lolim;
memset(wd, 0, max_el * sizeof(CHAR));
memset(code, 0, (1 << maxwd) * sizeof(SHORT));
num_el = code_rd >> (32 - 9);
addbits(9);
if (num_el > max_el)
num_el = max_el;
lolim = code_rd >> (32 - 4);
addbits(4);
uplim = code_rd >> (32 - 4);
addbits(4);
for (i = -1; ++i <= uplim;)
{
wd_svwd[i] = code_rd >> (32 - 3);
addbits(3);
}
if (!makecode(maxwd_svwd, uplim, wd_svwd, code))
return (0);
j = 0;
while (j <= num_el)
{
c = code[code_rd >> (32 - maxwd_svwd)];
addbits(wd_svwd[c]);
if (c < uplim)
wd[j++] = c;
else
{
l = (code_rd >> 28) + 4;
addbits(4);
while (l-- && j <= num_el)
wd[j++] = 0;
}
}
if (uplim)
for (i = 0; ++i <= num_el;)
wd[i] = (wd[i] + wd[i - 1]) % uplim;
for (i = -1; ++i <= num_el;)
if (wd[i])
wd[i] += lolim;
return (makecode(maxwd, num_el, wd, code));
}
INT calc_dectabs(void)
{
if (!read_wd(maxwd_mn, dcpr_code_mn, dcpr_wd_mn, max_cd_mn)
|| !read_wd(maxwd_lg, dcpr_code_lg, dcpr_wd_lg, max_cd_lg))
return (0);
blocksize = code_rd >> (32 - 15);
addbits(15);
return (1);
}
//---------------------------- BLOCK ROUTINES ------------------------------//
INT decompress_blk(CHAR * buf, UINT len)
{
LONG old_pos = dcpr_dpos;
INT i;
dcpr_do = 0;
if ((dcpr_do_max = len - maxlength) > dcpr_size)
dcpr_do_max = dcpr_size;
if ((LONG) dcpr_size > 0 && dcpr_do_max)
{
decompress();
if (old_pos + dcpr_do > dcpr_dicsiz)
{
i = dcpr_dicsiz - old_pos;
memcpy(buf, &dcpr_text[old_pos], i);
memcpy(&buf[i], dcpr_text, dcpr_do - i);
}
else
memcpy(buf, &dcpr_text[old_pos], dcpr_do);
}
dcpr_size -= dcpr_do;
return (dcpr_do);
}
INT unstore(CHAR * buf, UINT len)
{
UINT rd = 0,
i,
pos = 0;
#ifdef CRYPT
len = crypt_len(len - 8); /* because of decryption */
#endif /* CRYPT */
while ((i = read_adds_blk((CHAR *) buf_rd, (INT) ((i = ((len > dcpr_size) ? dcpr_size : len)) > size_rdb ? size_rdb : i))) != 0)
{
rd += i;
len -= i;
memcpy(&buf[pos], buf_rd, i);
pos += i;
}
dcpr_size -= rd;
for (i = 0; i < rd; i++)
{
dcpr_text[dcpr_dpos] = buf[i];
dcpr_dpos++;
dcpr_dpos &= dcpr_dican;
}
return (INT)rd;
}
INT dcpr_adds_blk(CHAR * buf, UINT len)
{
INT r;
switch (fhead.TECH.TYPE)
{
case TYPE_STORE:
r = unstore(buf, len);
break;
case TYPE_LZW1:
r = decompress_blk(buf, len);
break;
default:
error("\nFile compressed with unknown method. Decompression not possible.\n");
f_err = ERR_OTHER;
r = 0;
}
rd_crc = getcrc(rd_crc, (UCHAR*)buf, r);
return r;
}
//----------------------------- INIT ROUTINES ------------------------------//
void dcpr_init(void)
{
dcpr_frst_file = 1;
dcpr_dic = 20;
while ((dcpr_text = malloc(dcpr_dicsiz = (LONG) 1 << dcpr_dic))==NULL)
dcpr_dic--;
dcpr_dican = dcpr_dicsiz - 1;
}
void dcpr_init_file(void)
{
UINT i;
#ifdef CRYPT
reset_cryptkey();
#else /* CRYPT */
if (head.HEAD_FLAGS & ACE_PASSW)
{
error("\nFound passworded file. Decryption not supported.\n");
f_err = ERR_OTHER;
return;
}
#endif /* CRYPT */
rd_crc = CRC_MASK;
dcpr_size = fhead.SIZE;
if (fhead.TECH.TYPE == TYPE_LZW1)
{
if ((fhead.TECH.PARM & 15) + 10 > dcpr_dic)
{
error("\nNot enough memory or dictionary of archive too large.\n");
f_err = ERR_MEM;
return;
}
i = size_rdb * sizeof(LONG);
read_adds_blk((CHAR *) buf_rd, i);
#ifdef HI_LO_BYTE_ORDER
{
ULONG *p;
i>>=2; // count LONGs not BYTEs
p=buf_rd;
while (i--)
{
LONGswap(p);
p++;
}
}
#endif
code_rd = buf_rd[0];
bits_rd = rpos = 0;
blocksize = 0;
}
if (!adat.sol || dcpr_frst_file)
dcpr_dpos = 0;
dcpr_oldnum = 0;
memset(&dcpr_olddist, 0, sizeof(dcpr_olddist));
dcpr_frst_file = 0;
}
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