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Text File | 1991-04-12 | 30.8 KB | 1,042 lines |
- /*----------------------------------------------------------------------*/
- /* zhuf.c : Encoding/Decoding module for LHarc */
- /* */
- /* LZSS Algorithm Haruhiko.Okumura */
- /* Adaptic Huffman Encoding 1989.05.27 Haruyasu.Yoshizaki */
- /* */
- /* */
- /* Modified for UNIX LHarc V0.01 1989.05.28 Y.Tagawa */
- /* Modified for UNIX LHarc V0.02 1989.05.29 Y.Tagawa */
- /* Modified for UNIX LHarc V0.03 1989.07.02 Y.Tagawa */
- /*----------------------------------------------------------------------*/
-
- #include <string.h>
- #include "uucpbase.h"
- #include "uucpproto.h"
- #include "buffer.h"
-
- #ifndef SELFMAIN
- #include "lhio.h"
- #else
- #define EXIT_SUCCESS 0
- #define EXIT_FAILURE 1
- #endif
-
-
-
- FILE *infile, *outfile;
- long textsize, codesize;
-
-
- #define INDICATOR_THRESHOLD 4096L
- #define MAX_INDICATOR_COUNT 78
- long indicator_count;
- long indicator_threshold;
-
- #ifdef SELFMAIN
- int quiet = 0;
- #else
- extern int quiet;
- extern int output_to_test;
- #endif
-
-
- #ifdef SELFMAIN
- #define SETUP_PUTC_CRC(fp) /* nothing */
- #define SETUP_GETC_CRC(fp) /* nothing */
- #define PUTC_CRC(c) putc((c),(outfile))
- #define GETC_CRC() getc(infile)
- #define END_PUTC_CRC()
- #define END_GETC_CRC()
- #else
- #define SETUP_PUTC_CRC(fp) crc_outfile = fp
- #define SETUP_GETC_CRC(fp) crc_infile = fp
- #define PUTC_CRC(c) putc_crc(c)
- #define GETC_CRC() getc_crc()
- #define END_PUTC_CRC()
- #define END_GETC_CRC()
- #endif
-
-
-
-
- #ifdef SELFMAIN
- void Error (message)
- char *message;
- {
- printf("\n%s\n", message);
- exit(EXIT_FAILURE);
- }
- #endif
-
- /*----------------------------------------------------------------------*/
- /* */
- /* LZSS ENCODING */
- /* */
- /*----------------------------------------------------------------------*/
-
- #define N 4096 /* buffer size */
- #define F 60 /* pre-sence buffer size */
- #define THRESHOLD 2
- #define NIL N /* term of tree */
-
- unsigned char __far text_buf[N + F - 1];
- unsigned int match_position, match_length;
- int __far lson[N + 1], rson[N + 1 + N], dad[N + 1];
- unsigned char __far same[N + 1];
-
-
- /* Initialize Tree */
- InitTree ()
- {
- register int *p, *e;
-
- for (p = rson + N + 1, e = rson + N + N; p <= e; )
- *p++ = NIL;
- for (p = dad, e = dad + N; p < e; )
- *p++ = NIL;
- }
-
-
- /* Insert to node */
- InsertNode (r)
- register int r;
- {
- register int p;
- int cmp;
- register unsigned char *key;
- register unsigned int c;
- register unsigned int i, j;
-
- cmp = 1;
- key = &text_buf[r];
- i = key[1] ^ key[2];
- i ^= i >> 4;
- p = N + 1 + key[0] + ((i & 0x0f) << 8);
- rson[r] = lson[r] = NIL;
- match_length = 0;
- i = j = 1;
- for ( ; ; ) {
- if (cmp >= 0) {
- if (rson[p] != NIL) {
- p = rson[p];
- j = same[p];
- } else {
- rson[p] = r;
- dad[r] = p;
- same[r] = i;
- return;
- }
- } else {
- if (lson[p] != NIL) {
- p = lson[p];
- j = same[p];
- } else {
- lson[p] = r;
- dad[r] = p;
- same[r] = i;
- return;
- }
- }
-
- if (i > j) {
- i = j;
- cmp = key[i] - text_buf[p + i];
- } else
- if (i == j) {
- for (; i < F; i++)
- if ((cmp = key[i] - text_buf[p + i]) != 0)
- break;
- }
-
- if (i > THRESHOLD) {
- if (i > match_length) {
- match_position = ((r - p) & (N - 1)) - 1;
- if ((match_length = i) >= F)
- break;
- } else
- if (i == match_length) {
- if ((c = ((r - p) & (N - 1)) - 1) < match_position) {
- match_position = c;
- }
- }
- }
- }
- same[r] = same[p];
- dad[r] = dad[p];
- lson[r] = lson[p];
- rson[r] = rson[p];
- dad[lson[p]] = r;
- dad[rson[p]] = r;
- if (rson[dad[p]] == p)
- rson[dad[p]] = r;
- else
- lson[dad[p]] = r;
- dad[p] = NIL; /* remove p */
- }
-
-
- link (n, p, q)
- int n, p, q;
- {
- register unsigned char *s1, *s2, *s3;
- if (p >= NIL) {
- same[q] = 1;
- return;
- }
- s1 = text_buf + p + n;
- s2 = text_buf + q + n;
- s3 = text_buf + p + F;
- while (s1 < s3) {
- if (*s1++ != *s2++) {
- same[q] = s1 - 1 - text_buf - p;
- return;
- }
- }
- same[q] = F;
- }
-
-
- linknode (p, q, r)
- int p, q, r;
- {
- int cmp;
-
- if ((cmp = same[q] - same[r]) == 0) {
- link(same[q], p, r);
- } else if (cmp < 0) {
- same[r] = same[q];
- }
- }
-
- DeleteNode (p)
- register int p;
- {
- register int q;
-
- if (dad[p] == NIL)
- return; /* has no linked */
- if (rson[p] == NIL) {
- if ((q = lson[p]) != NIL)
- linknode(dad[p], p, q);
- } else
- if (lson[p] == NIL) {
- q = rson[p];
- linknode(dad[p], p, q);
- } else {
- q = lson[p];
- if (rson[q] != NIL) {
- do {
- q = rson[q];
- } while (rson[q] != NIL);
- if (lson[q] != NIL)
- linknode(dad[q], q, lson[q]);
- link(1, q, lson[p]);
- rson[dad[q]] = lson[q];
- dad[lson[q]] = dad[q];
- lson[q] = lson[p];
- dad[lson[p]] = q;
- }
- link(1, dad[p], q);
- link(1, q, rson[p]);
- rson[q] = rson[p];
- dad[rson[p]] = q;
- }
- dad[q] = dad[p];
- if (rson[dad[p]] == p)
- rson[dad[p]] = q;
- else
- lson[dad[p]] = q;
- dad[p] = NIL;
- }
-
- /*----------------------------------------------------------------------*/
- /* */
- /* HUFFMAN ENCODING */
- /* */
- /*----------------------------------------------------------------------*/
-
- #define N_CHAR (256 - THRESHOLD + F) /* {code : 0 .. N_CHAR-1} */
- #define T (N_CHAR * 2 - 1) /* size of table */
- #define R (T - 1) /* root position */
- #define MAX_FREQ 0x8000 /* tree update timing from frequency */
-
- typedef unsigned char uchar;
-
-
-
- /* TABLE OF ENCODE/DECODE for upper 6bits position information */
-
- /* for encode */
- uchar p_len[64] = {
- 0x03, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x06, 0x06, 0x06, 0x06,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
- 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08
- };
-
- uchar p_code[64] = {
- 0x00, 0x20, 0x30, 0x40, 0x50, 0x58, 0x60, 0x68,
- 0x70, 0x78, 0x80, 0x88, 0x90, 0x94, 0x98, 0x9C,
- 0xA0, 0xA4, 0xA8, 0xAC, 0xB0, 0xB4, 0xB8, 0xBC,
- 0xC0, 0xC2, 0xC4, 0xC6, 0xC8, 0xCA, 0xCC, 0xCE,
- 0xD0, 0xD2, 0xD4, 0xD6, 0xD8, 0xDA, 0xDC, 0xDE,
- 0xE0, 0xE2, 0xE4, 0xE6, 0xE8, 0xEA, 0xEC, 0xEE,
- 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
- 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
- };
-
- /* for decode */
- uchar d_code[256] = {
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
- 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
- 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
- 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
- 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
- 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
- 0x0A, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A, 0x0A,
- 0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B, 0x0B,
- 0x0C, 0x0C, 0x0C, 0x0C, 0x0D, 0x0D, 0x0D, 0x0D,
- 0x0E, 0x0E, 0x0E, 0x0E, 0x0F, 0x0F, 0x0F, 0x0F,
- 0x10, 0x10, 0x10, 0x10, 0x11, 0x11, 0x11, 0x11,
- 0x12, 0x12, 0x12, 0x12, 0x13, 0x13, 0x13, 0x13,
- 0x14, 0x14, 0x14, 0x14, 0x15, 0x15, 0x15, 0x15,
- 0x16, 0x16, 0x16, 0x16, 0x17, 0x17, 0x17, 0x17,
- 0x18, 0x18, 0x19, 0x19, 0x1A, 0x1A, 0x1B, 0x1B,
- 0x1C, 0x1C, 0x1D, 0x1D, 0x1E, 0x1E, 0x1F, 0x1F,
- 0x20, 0x20, 0x21, 0x21, 0x22, 0x22, 0x23, 0x23,
- 0x24, 0x24, 0x25, 0x25, 0x26, 0x26, 0x27, 0x27,
- 0x28, 0x28, 0x29, 0x29, 0x2A, 0x2A, 0x2B, 0x2B,
- 0x2C, 0x2C, 0x2D, 0x2D, 0x2E, 0x2E, 0x2F, 0x2F,
- 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
- 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
- };
-
- uchar d_len[256] = {
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
- 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
- 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
- 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
- 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
- 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
- 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
- 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
- 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
- };
-
- unsigned freq[T + 1]; /* frequency table */
-
- int prnt[T + N_CHAR]; /* points to parent node */
- /* notes :
- prnt[T .. T + N_CHAR - 1] used by
- indicates leaf position that corresponding to code */
-
- int son[T]; /* points to son node (son[i],son[i+]) */
-
- unsigned getbuf = 0;
- uchar getlen = 0;
-
-
- /* get one bit */
- /* returning in Bit 0 */
- int GetBit ()
- {
- register unsigned int dx = getbuf;
- register unsigned int c;
-
- if (getlen <= 8)
- {
- c = getc (infile);
- if ((int)c < 0) c = 0;
- dx |= c << (8 - getlen);
- getlen += 8;
- }
- getbuf = dx << 1;
- getlen--;
- return (dx & 0x8000) ? 1 : 0;
- }
-
- /* get one byte */
- /* returning in Bit7...0 */
- int GetByte ()
- {
- register unsigned int dx = getbuf;
- register unsigned c;
-
- if (getlen <= 8) {
- c = getc (infile);
- if ((int)c < 0) c = 0;
- dx |= c << (8 - getlen);
- getlen += 8;
- }
- getbuf = dx << 8;
- getlen -= 8;
- return (dx >> 8) & 0xff;
- }
-
- /* get N bit */
- /* returning in Bit(N-1)...Bit 0 */
- int GetNBits (n)
- register unsigned int n;
- {
- register unsigned int dx = getbuf;
- register unsigned int c;
- static int mask[17] = {
- 0x0000,
- 0x0001, 0x0003, 0x0007, 0x000f,
- 0x001f, 0x003f, 0x007f, 0x00ff,
- 0x01ff, 0x03ff, 0x07ff, 0x0fff,
- 0x1fff, 0x3fff, 0x0fff, 0xffff };
- static int shift[17] = {
- 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };
-
- if (getlen <= 8)
- {
- c = getc (infile);
- if ((int)c < 0) c = 0;
- dx |= c << (8 - getlen);
- getlen += 8;
- }
- getbuf = dx << n;
- getlen -= n;
- return (dx >> shift[n]) & mask[n];
- }
-
- unsigned putbuf = 0;
- uchar putlen = 0;
-
- /* output C bits */
- Putcode (l, c)
- register int l;
- register unsigned int c;
- {
- register len = putlen;
- register unsigned int b = putbuf;
- b |= c >> len;
- if ((len += l) >= 8) {
- putc (b >> 8, outfile);
- if ((len -= 8) >= 8) {
- putc (b, outfile);
- codesize += 2;
- len -= 8;
- b = c << (l - len);
- } else {
- b <<= 8;
- codesize++;
- }
- }
- putbuf = b;
- putlen = len;
- }
-
-
- /* Initialize tree */
-
- StartHuff ()
- {
- register int i, j;
-
- for (i = 0; i < N_CHAR; i++) {
- freq[i] = 1;
- son[i] = i + T;
- prnt[i + T] = i;
- }
- i = 0; j = N_CHAR;
- while (j <= R) {
- freq[j] = freq[i] + freq[i + 1];
- son[j] = i;
- prnt[i] = prnt[i + 1] = j;
- i += 2; j++;
- }
- freq[T] = 0xffff;
- prnt[R] = 0;
- putlen = getlen = 0;
- putbuf = getbuf = 0;
- }
-
-
- /* reconstruct tree */
- reconst ()
- {
- register int i, j, k;
- register unsigned f;
-
- /* correct leaf node into of first half,
- and set these freqency to (freq+1)/2 */
- j = 0;
- for (i = 0; i < T; i++) {
- if (son[i] >= T) {
- freq[j] = (freq[i] + 1) / 2;
- son[j] = son[i];
- j++;
- }
- }
- /* build tree. Link sons first */
- for (i = 0, j = N_CHAR; j < T; i += 2, j++) {
- k = i + 1;
- f = freq[j] = freq[i] + freq[k];
- for (k = j - 1; f < freq[k]; k--);
- k++;
- { register unsigned *p, *e;
- for (p = &freq[j], e = &freq[k]; p > e; p--)
- p[0] = p[-1];
- freq[k] = f;
- }
- { register int *p, *e;
- for (p = &son[j], e = &son[k]; p > e; p--)
- p[0] = p[-1];
- son[k] = i;
- }
- }
- /* link parents */
- for (i = 0; i < T; i++) {
- if ((k = son[i]) >= T) {
- prnt[k] = i;
- } else {
- prnt[k] = prnt[k + 1] = i;
- }
- }
- }
-
-
- /* update given code's frequency, and update tree */
-
- update (c)
- unsigned int c;
- {
- register unsigned *p;
- register int i, j, k, l;
-
- if (freq[R] == MAX_FREQ) {
- reconst();
- }
- c = prnt[c + T];
- do {
- k = ++freq[c];
-
- /* swap nodes when become wrong frequency order. */
- if (k > freq[l = c + 1]) {
- for (p = freq+l+1; k > *p++; ) ;
- l = p - freq - 2;
- freq[c] = p[-2];
- p[-2] = k;
-
- i = son[c];
- prnt[i] = l;
- if (i < T) prnt[i + 1] = l;
-
- j = son[l];
- son[l] = i;
-
- prnt[j] = c;
- if (j < T) prnt[j + 1] = c;
- son[c] = j;
-
- c = l;
- }
- } while ((c = prnt[c]) != 0); /* loop until reach to root */
- }
-
- /* unsigned code, len; */
-
- EncodeChar (c)
- unsigned c;
- {
- register int *p;
- register unsigned long i;
- register int j, k;
-
- i = 0;
- j = 0;
- p = prnt;
- k = p[c + T];
-
- /* trace links from leaf node to root */
- do {
- i >>= 1;
-
- /* if node index is odd, trace larger of sons */
- if (k & 1) i += 0x80000000;
-
- j++;
- } while ((k = p[k]) != R) ;
- if (j > 16) {
- Putcode(16, (unsigned int)(i >> 16));
- Putcode(j - 16, (unsigned int)i);
- } else {
- Putcode(j, (unsigned int)(i >> 16));
- }
- /* code = i; */
- /* len = j; */
- update(c);
- }
-
- EncodePosition (c)
- unsigned c;
- {
- unsigned i;
-
- /* output upper 6bit from table */
- i = c >> 6;
- Putcode((int)(p_len[i]), (unsigned int)(p_code[i]) << 8);
-
- /* output lower 6 bit */
- Putcode(6, (unsigned int)(c & 0x3f) << 10);
- }
-
- EncodeEnd ()
- {
- if (putlen) {
- putc(putbuf >> 8, outfile);
- codesize++;
- }
- }
-
- int DecodeChar ()
- {
- register unsigned c;
-
- c = son[R];
-
- /* trace from root to leaf,
- got bit is 0 to small(son[]), 1 to large (son[]+1) son node */
- while (c < T) {
- c += GetBit();
- c = son[c];
- }
- c -= T;
- update(c);
- return c;
- }
-
- int DecodePosition ()
- {
- unsigned i, j, c;
-
- /* decode upper 6bit from table */
- i = GetByte();
- c = (unsigned)d_code[i] << 6;
- j = d_len[i];
-
- /* get lower 6bit */
- j -= 2;
- return c | (((i << j) | GetNBits (j)) & 0x3f);
- }
-
-
- Encode ()
- {
- register int i, c, len, r, s, last_match_length;
-
- if (textsize == 0)
- return;
-
- textsize = 0;
- StartHuff();
- InitTree();
- s = 0;
- r = N - F;
- for (i = s; i < r; i++)
- text_buf[i] = ' ';
- for (len = 0; len < F && (c = GETC_CRC()) != EOF; len++)
- text_buf[r + len] = c;
- textsize = len;
- for (i = 1; i <= F; i++)
- InsertNode(r - i);
- InsertNode(r);
- do {
- if (match_length > len)
- match_length = len;
- if (match_length <= THRESHOLD) {
- match_length = 1;
- EncodeChar(text_buf[r]);
- } else {
- EncodeChar(255 - THRESHOLD + match_length);
- EncodePosition(match_position);
- }
- last_match_length = match_length;
- for (i = 0; i < last_match_length &&
- (c = GETC_CRC()) != EOF; i++) {
- DeleteNode(s);
- text_buf[s] = c;
- if (s < F - 1)
- text_buf[s + N] = c;
- s = (s + 1) & (N - 1);
- r = (r + 1) & (N - 1);
- InsertNode(r);
- }
-
- textsize += i;
- if ((textsize > indicator_count) && !quiet) {
- putchar (BALL);
- fflush (stdout);
- indicator_count += indicator_threshold;
- }
- while (i++ < last_match_length) {
- DeleteNode(s);
- s = (s + 1) & (N - 1);
- r = (r + 1) & (N - 1);
- if (--len) InsertNode(r);
- }
- } while (len > 0);
- EncodeEnd();
- END_GETC_CRC ();
- }
-
- Decode ()
- {
- register int i, j, k, r, c;
- register long count;
-
- #ifdef SELFMAIN
- if (textsize == 0)
- return;
- #endif
- StartHuff();
- for (i = 0; i < N - F; i++)
- text_buf[i] = ' ';
- r = N - F;
- for (count = 0; count < textsize; ) {
- c = DecodeChar();
- if (c < 256) {
- PUTC_CRC (c);
- text_buf[r++] = c;
- r &= (N - 1);
- count++;
- } else {
- i = (r - DecodePosition() - 1) & (N - 1);
- j = c - 255 + THRESHOLD;
- for (k = 0; k < j; k++) {
- c = text_buf[(i + k) & (N - 1)];
- PUTC_CRC (c);
- text_buf[r++] = c;
- r &= (N - 1);
- count++;
- }
- }
-
- if (!quiet && (count > indicator_count)) {
- putchar (BALL);
- fflush (stdout);
- indicator_count += indicator_threshold;
- }
- }
- END_PUTC_CRC ();
- }
-
-
- /*----------------------------------------------------------------------*/
- /* */
- /* LARC */
- /* */
- /*----------------------------------------------------------------------*/
-
- #define F_OLD 18 /* look ahead buffer size for LArc */
-
- /* intialize buffer for LArc type 5 */
- InitBuf ()
- {
- register unsigned char *p = text_buf;
- register int i, j;
- for (i = 0; i < 256; i ++)
- for (j = 0; j < 13; j ++)
- *p ++ = i;
- for (i = 0; i < 256; i ++)
- *p ++ = i;
- for (i = 0; i < 256; i ++)
- *p ++ = 255 - i;
- for (i = 0; i < 128; i ++)
- *p ++ = 0;
- for (i = 0; i < 128; i ++)
- *p ++ = 0x20;
- }
-
- /* Decode LArc type 5 */
- DecodeOld ()
- {
- register int si, di;
- register long count;
- int dl, dh, al, cx;
- if (textsize == 0)
- return;
-
- InitBuf ();
- di = N - F_OLD;
- dl = 0x80;
-
- for (count = 0; count < textsize; ) {
- dl = ((dl << 1) | (dl >> 7)) & 0xff;
- if (dl & 0x01)
- dh = getc (infile);
- al = getc (infile);
- if ((dh & dl) != 0) {
- PUTC_CRC (al);
- text_buf[di] = al;
- di = (di + 1) & (N - 1);
- count ++;
- } else {
- cx = getc (infile);
- si = (al & 0x00ff) | ((cx << 4) & 0x0f00);
- cx = (cx & 0x000f) + 3;
- count += cx;
- do {
- text_buf[di] = al = text_buf[si];
- PUTC_CRC (al);
- si = (si + 1) & (N - 1);
- di = (di + 1) & (N - 1);
- } while (--cx != 0) ;
- }
-
- if (!quiet && (count > indicator_count)) {
- putchar (BALL);
- fflush (stdout);
- indicator_count += indicator_threshold;
- }
- }
- END_PUTC_CRC ();
- }
-
-
-
- /*----------------------------------------------------------------------*/
- /* */
- /* Global Entries for Archiver Driver */
- /* */
- /*----------------------------------------------------------------------*/
-
-
- start_indicator (name, size, msg)
- char *name;
- long size;
- char *msg;
- {
- long i;
- int m;
-
- if (quiet)
- return;
-
- #ifdef ANSI
- m = MAX_INDICATOR_COUNT;
- #else
- m = MAX_INDICATOR_COUNT - strlen (name);
- #endif
- if (m < 0)
- m = 3; /* (^_^) */
-
- #ifdef ANSI
- printf ("\r%s - %s:\n", name, msg);
- #else
- printf ("\r%s - %s : ", name, msg);
- #endif
-
- indicator_threshold =
- ((size + (m * INDICATOR_THRESHOLD - 1)) /
- (m * INDICATOR_THRESHOLD) *
- INDICATOR_THRESHOLD);
- i = ((size + (indicator_threshold - 1)) / indicator_threshold);
- while (i--)
- putchar (DOT);
- indicator_count = 0;
- #ifdef ANSI
- printf ("\r%s%s - %s:\n", CURSORUP, name, msg);
- #else
- printf ("\r%s - %s : ", name, msg);
- #endif
- fflush (stdout);
- }
-
- finish_indicator2 (name, msg, pcnt)
- char *name;
- char *msg;
- int pcnt;
- {
- if (quiet)
- return;
-
- if (pcnt > 100) pcnt = 100; /* (^_^) */
- #ifdef ANSI
- printf ("\r%s%s - %s(%d%%)\n%s", CURSORUP, name, msg, pcnt, ERASEEOL);
- #else
- printf ("\r%s - %s(%d%%)\n", name, msg, pcnt);
- #endif
- fflush (stdout);
- }
-
- finish_indicator (name, msg)
- char *name;
- char *msg;
- {
- if (quiet)
- return;
-
- #ifdef ANSI
- printf ("\r%s%s - %s\n%s", CURSORUP, name, msg, ERASEEOL);
- #else
- printf ("\r%s - %s\n", name, msg);
- #endif
- fflush (stdout);
- }
-
-
- #ifndef SELFMAIN
- int encode_lzhuf (infp, outfp, size, original_size_var, packed_size_var, name)
- FILE *infp;
- FILE *outfp;
- long size;
- long *original_size_var;
- long *packed_size_var;
- char *name;
- {
- infile = infp;
- outfile = outfp;
- SETUP_GETC_CRC(infp);
- textsize = size;
- codesize = 0;
- init_crc ();
- start_indicator (name, size, "Freezing");
- Encode ();
- finish_indicator2 (name, "Frozen",
- (int)((codesize * 100L) / crc_size));
- *packed_size_var = codesize;
- *original_size_var = crc_size;
- return crc_value;
- }
-
- int decode_lzhuf (infp, outfp, original_size, name)
- FILE *infp;
- FILE *outfp;
- long original_size;
- char *name;
- {
- infile = infp;
- outfile = outfp;
- SETUP_PUTC_CRC(outfp);
- textsize = original_size;
- init_crc ();
- start_indicator (name, original_size,
- (output_to_test ? "Testing" : "Melting"));
- Decode ();
- finish_indicator (name, (output_to_test ? "Tested " : "Melted "));
- return crc_value;
- }
-
-
- int decode_larc (infp, outfp, original_size, name)
- FILE *infp, *outfp;
- long original_size;
- char *name;
- {
- infile = infp;
- outfile = outfp;
- SETUP_PUTC_CRC(outfp);
- textsize = original_size;
- init_crc ();
- start_indicator (name, original_size,
- (output_to_test ? "Testing" : "Melting"));
- DecodeOld ();
- finish_indicator (name, (output_to_test ? "Tested " : "Melted "));
- return crc_value;
- }
- #endif
-
- #ifdef SELFMAIN
- int main (argc, argv)
- int argc;
- char *argv[];
- {
- char *s;
- int i;
-
- indicator_count = 0;
- indicator_threshold = 1024;
- textsize = codesize = 0;
- if (argc != 4) {
- printf ("\
- usage: lzhuf e in_file out_file (packing)\n\
- lzhuf d in_file out_file (unpacking)\n");
- return EXIT_FAILURE;
- }
- if ((s = argv[1], ((*s != 'e') && (*s != 'd')) || s[1] != '\0') ||
- (s = argv[2], (infile = fopen(s, "rb")) == NULL) ||
- (s = argv[3], (outfile = fopen(s, "wb")) == NULL)) {
- printf("??? %s\n", s);
- return EXIT_FAILURE;
- }
- if (argv[1][0] == 'e') {
- /* Get original text size and output it */
- fseek(infile, 0L, 2);
- textsize = ftell(infile);
- rewind (infile);
- if (fwrite(&textsize, sizeof textsize, 1, outfile) < 1)
- Error("cannot write");
-
- start_indicator (argv[2], textsize, "Freezing");
- Encode();
- finish_indicator2 (argv[2], "Frozen",
- (int)((codesize * 100L) / textsize));
-
- printf("input : %ld bytes\n", textsize);
- printf("output: %ld bytes\n", codesize);
- } else {
- /* Read original text size */
- if (fread(&textsize, sizeof textsize, 1, infile) < 1)
- Error("cannot read");
-
- start_indicator (argv[2], textsize, "Melting");
- Decode();
- finish_indicator (argv[2], "Melted ");
- }
- fclose(infile);
- fclose(outfile);
- return EXIT_SUCCESS;
- }
- #endif
-
-
- /* These lines are used in GNU-Emacs */
- /* Local Variables: */
- /* comment-column:40 */
- /* tab-width:8 */
- /* c-indent-level:8 */
- /* c-continued-statement-offset:8 */
- /* c-argdecl-indent:8 */
- /* End: */
-