* written by Haruhiko Okumura.
*/
-#ifdef RCSID
-static char rcsid[] = "$Id: unlzh.c,v 1.2 1993/06/24 10:59:01 jloup Exp $";
-#endif
-
#include <config.h>
#include <stdio.h>
/* decode.c */
-local unsigned decode OF((unsigned count, uch buffer[]));
-local void decode_start OF((void));
+local unsigned decode (unsigned count, uch buffer[]);
+local void decode_start (void);
/* huf.c */
-local void huf_decode_start OF((void));
-local unsigned decode_c OF((void));
-local unsigned decode_p OF((void));
-local void read_pt_len OF((int nn, int nbit, int i_special));
-local void read_c_len OF((void));
+local void huf_decode_start (void);
+local unsigned decode_c (void);
+local unsigned decode_p (void);
+local void read_pt_len (int nn, int nbit, int i_special);
+local void read_c_len (void);
/* io.c */
-local void fillbuf OF((int n));
-local unsigned getbits OF((int n));
-local void init_getbits OF((void));
+local void fillbuf (int n);
+local unsigned getbits (int n);
+local void init_getbits (void);
/* maketbl.c */
-local void make_table OF((int nchar, uch bitlen[],
- int tablebits, ush table[]));
+local void make_table (int nchar, uch bitlen[],
+ int tablebits, ush table[]);
#define DICBIT 13 /* 12(-lh4-) or 13(-lh5-) */
/* huf.c */
#define NC (UCHAR_MAX + MAXMATCH + 2 - THRESHOLD)
- /* alphabet = {0, 1, 2, ..., NC - 1} */
+ /* alphabet = {0, 1, 2, ..., NC - 1} */
#define CBIT 9 /* $\lfloor \log_2 NC \rfloor + 1$ */
#define CODE_BIT 16 /* codeword length */
#define NT (CODE_BIT + 3)
#define PBIT 4 /* smallest integer such that (1U << PBIT) > NP */
#define TBIT 5 /* smallest integer such that (1U << TBIT) > NT */
-#if NT > NP
-# define NPT NT
-#else
-# define NPT NP
-#endif
+#define NPT (1 << TBIT)
/* local ush left[2 * NC - 1]; */
/* local ush right[2 * NC - 1]; */
{
bitbuf <<= n;
while (n > bitcount) {
- bitbuf |= subbitbuf << (n -= bitcount);
- subbitbuf = (unsigned)try_byte();
- if ((int)subbitbuf == EOF) subbitbuf = 0;
- bitcount = CHAR_BIT;
+ bitbuf |= subbitbuf << (n -= bitcount);
+ subbitbuf = (unsigned)try_byte();
+ if ((int)subbitbuf == EOF) subbitbuf = 0;
+ bitcount = CHAR_BIT;
}
bitbuf |= subbitbuf >> (bitcount -= n);
}
}
/***********************************************************
- maketbl.c -- make table for decoding
+ maketbl.c -- make table for decoding
***********************************************************/
local void make_table(nchar, bitlen, tablebits, table)
start[1] = 0;
for (i = 1; i <= 16; i++)
- start[i + 1] = start[i] + (count[i] << (16 - i));
+ start[i + 1] = start[i] + (count[i] << (16 - i));
if ((start[17] & 0xffff) != 0)
- error("Bad table\n");
+ gzip_error ("Bad table\n");
jutbits = 16 - tablebits;
for (i = 1; i <= (unsigned)tablebits; i++) {
- start[i] >>= jutbits;
- weight[i] = (unsigned) 1 << (tablebits - i);
+ start[i] >>= jutbits;
+ weight[i] = (unsigned) 1 << (tablebits - i);
}
while (i <= 16) {
- weight[i] = (unsigned) 1 << (16 - i);
- i++;
+ weight[i] = (unsigned) 1 << (16 - i);
+ i++;
}
i = start[tablebits + 1] >> jutbits;
if (i != 0) {
- k = 1 << tablebits;
- while (i != k) table[i++] = 0;
+ k = 1 << tablebits;
+ while (i != k) table[i++] = 0;
}
avail = nchar;
mask = (unsigned) 1 << (15 - tablebits);
for (ch = 0; ch < (unsigned)nchar; ch++) {
- if ((len = bitlen[ch]) == 0) continue;
- nextcode = start[len] + weight[len];
- if (len <= (unsigned)tablebits) {
- for (i = start[len]; i < nextcode; i++) table[i] = ch;
- } else {
- k = start[len];
- p = &table[k >> jutbits];
- i = len - tablebits;
- while (i != 0) {
- if (*p == 0) {
- right[avail] = left[avail] = 0;
- *p = avail++;
- }
- if (k & mask) p = &right[*p];
- else p = &left[*p];
- k <<= 1; i--;
- }
- *p = ch;
- }
- start[len] = nextcode;
+ if ((len = bitlen[ch]) == 0) continue;
+ nextcode = start[len] + weight[len];
+ if (len <= (unsigned)tablebits) {
+ if ((unsigned) 1 << tablebits < nextcode)
+ gzip_error ("Bad table\n");
+ for (i = start[len]; i < nextcode; i++) table[i] = ch;
+ } else {
+ k = start[len];
+ p = &table[k >> jutbits];
+ i = len - tablebits;
+ while (i != 0) {
+ if (*p == 0) {
+ right[avail] = left[avail] = 0;
+ *p = avail++;
+ }
+ if (k & mask) p = &right[*p];
+ else p = &left[*p];
+ k <<= 1; i--;
+ }
+ *p = ch;
+ }
+ start[len] = nextcode;
}
}
n = getbits(nbit);
if (n == 0) {
- c = getbits(nbit);
- for (i = 0; i < nn; i++) pt_len[i] = 0;
- for (i = 0; i < 256; i++) pt_table[i] = c;
+ c = getbits(nbit);
+ for (i = 0; i < nn; i++) pt_len[i] = 0;
+ for (i = 0; i < 256; i++) pt_table[i] = c;
} else {
- i = 0;
- while (i < n) {
- c = bitbuf >> (BITBUFSIZ - 3);
- if (c == 7) {
- mask = (unsigned) 1 << (BITBUFSIZ - 1 - 3);
- while (mask & bitbuf) { mask >>= 1; c++; }
- }
- fillbuf((c < 7) ? 3 : c - 3);
- pt_len[i++] = c;
- if (i == i_special) {
- c = getbits(2);
- while (--c >= 0) pt_len[i++] = 0;
- }
- }
- while (i < nn) pt_len[i++] = 0;
- make_table(nn, pt_len, 8, pt_table);
+ i = 0;
+ while (i < n) {
+ c = bitbuf >> (BITBUFSIZ - 3);
+ if (c == 7) {
+ mask = (unsigned) 1 << (BITBUFSIZ - 1 - 3);
+ while (mask & bitbuf) { mask >>= 1; c++; }
+ if (16 < c)
+ gzip_error ("Bad table\n");
+ }
+ fillbuf((c < 7) ? 3 : c - 3);
+ pt_len[i++] = c;
+ if (i == i_special) {
+ c = getbits(2);
+ while (--c >= 0) pt_len[i++] = 0;
+ }
+ }
+ while (i < nn) pt_len[i++] = 0;
+ make_table(nn, pt_len, 8, pt_table);
}
}
n = getbits(CBIT);
if (n == 0) {
- c = getbits(CBIT);
- for (i = 0; i < NC; i++) c_len[i] = 0;
- for (i = 0; i < 4096; i++) c_table[i] = c;
+ c = getbits(CBIT);
+ for (i = 0; i < NC; i++) c_len[i] = 0;
+ for (i = 0; i < 4096; i++) c_table[i] = c;
} else {
- i = 0;
- while (i < n) {
- c = pt_table[bitbuf >> (BITBUFSIZ - 8)];
- if (c >= NT) {
- mask = (unsigned) 1 << (BITBUFSIZ - 1 - 8);
- do {
- if (bitbuf & mask) c = right[c];
- else c = left [c];
- mask >>= 1;
- } while (c >= NT);
- }
- fillbuf((int) pt_len[c]);
- if (c <= 2) {
- if (c == 0) c = 1;
- else if (c == 1) c = getbits(4) + 3;
- else c = getbits(CBIT) + 20;
- while (--c >= 0) c_len[i++] = 0;
- } else c_len[i++] = c - 2;
- }
- while (i < NC) c_len[i++] = 0;
- make_table(NC, c_len, 12, c_table);
+ i = 0;
+ while (i < n) {
+ c = pt_table[bitbuf >> (BITBUFSIZ - 8)];
+ if (c >= NT) {
+ mask = (unsigned) 1 << (BITBUFSIZ - 1 - 8);
+ do {
+ if (bitbuf & mask) c = right[c];
+ else c = left [c];
+ mask >>= 1;
+ } while (c >= NT);
+ }
+ fillbuf((int) pt_len[c]);
+ if (c <= 2) {
+ if (c == 0) c = 1;
+ else if (c == 1) c = getbits(4) + 3;
+ else c = getbits(CBIT) + 20;
+ while (--c >= 0) c_len[i++] = 0;
+ } else c_len[i++] = c - 2;
+ }
+ while (i < NC) c_len[i++] = 0;
+ make_table(NC, c_len, 12, c_table);
}
}
unsigned j, mask;
if (blocksize == 0) {
- blocksize = getbits(16);
- if (blocksize == 0) {
- return NC; /* end of file */
- }
- read_pt_len(NT, TBIT, 3);
- read_c_len();
- read_pt_len(NP, PBIT, -1);
+ blocksize = getbits(16);
+ if (blocksize == 0) {
+ return NC; /* end of file */
+ }
+ read_pt_len(NT, TBIT, 3);
+ read_c_len();
+ read_pt_len(NP, PBIT, -1);
}
blocksize--;
j = c_table[bitbuf >> (BITBUFSIZ - 12)];
if (j >= NC) {
- mask = (unsigned) 1 << (BITBUFSIZ - 1 - 12);
- do {
- if (bitbuf & mask) j = right[j];
- else j = left [j];
- mask >>= 1;
- } while (j >= NC);
+ mask = (unsigned) 1 << (BITBUFSIZ - 1 - 12);
+ do {
+ if (bitbuf & mask) j = right[j];
+ else j = left [j];
+ mask >>= 1;
+ } while (j >= NC);
}
fillbuf((int) c_len[j]);
return j;
j = pt_table[bitbuf >> (BITBUFSIZ - 8)];
if (j >= NP) {
- mask = (unsigned) 1 << (BITBUFSIZ - 1 - 8);
- do {
- if (bitbuf & mask) j = right[j];
- else j = left [j];
- mask >>= 1;
- } while (j >= NP);
+ mask = (unsigned) 1 << (BITBUFSIZ - 1 - 8);
+ do {
+ if (bitbuf & mask) j = right[j];
+ else j = left [j];
+ mask >>= 1;
+ } while (j >= NP);
}
fillbuf((int) pt_len[j]);
if (j != 0) j = ((unsigned) 1 << (j - 1)) + getbits((int) (j - 1));
r = 0;
while (--j >= 0) {
- buffer[r] = buffer[i];
- i = (i + 1) & (DICSIZ - 1);
- if (++r == count) return r;
+ buffer[r] = buffer[i];
+ i = (i + 1) & (DICSIZ - 1);
+ if (++r == count) return r;
}
for ( ; ; ) {
- c = decode_c();
- if (c == NC) {
- done = 1;
- return r;
- }
- if (c <= UCHAR_MAX) {
- buffer[r] = c;
- if (++r == count) return r;
- } else {
- j = c - (UCHAR_MAX + 1 - THRESHOLD);
- i = (r - decode_p() - 1) & (DICSIZ - 1);
- while (--j >= 0) {
- buffer[r] = buffer[i];
- i = (i + 1) & (DICSIZ - 1);
- if (++r == count) return r;
- }
- }
+ c = decode_c();
+ if (c == NC) {
+ done = 1;
+ return r;
+ }
+ if (c <= UCHAR_MAX) {
+ buffer[r] = c;
+ if (++r == count) return r;
+ } else {
+ j = c - (UCHAR_MAX + 1 - THRESHOLD);
+ i = (r - decode_p() - 1) & (DICSIZ - 1);
+ while (--j >= 0) {
+ buffer[r] = buffer[i];
+ i = (i + 1) & (DICSIZ - 1);
+ if (++r == count) return r;
+ }
+ }
}
}
decode_start();
while (!done) {
- n = decode((unsigned) DICSIZ, window);
- if (!test && n > 0) {
- write_buf(out, (char*)window, n);
- }
+ n = decode((unsigned) DICSIZ, window);
+ if (!test && n > 0) {
+ write_buf(out, (char*)window, n);
+ }
}
return OK;
}
projects / debian / gzip / blobdiff