workbench/devs/diskimage/dms/xdms.h

   1 /*
   2  *     xDMS  v1.3  -  Portable DMS archive unpacker  -  Public Domain
   3  *     Written by     Andre Rodrigues de la Rocha  <adlroc@usa.net>
   4  *
   5  */
   6
   7 #ifndef XDMS_H
   8 #define XDMS_H
   9
  10 #ifndef EXEC_TYPES_H
  11 #include <exec/types.h>
  12 #endif
  13
  14 #include <string.h>
  15
  16 struct xdms_data {
  17         UWORD PWDCRC;
  18         UWORD quick_text_loc;
  19         UWORD medium_text_loc;
  20         UWORD heavy_text_loc;
  21         UWORD deep_text_loc;
  22         int init_deep_tabs;
  23         UBYTE *text;
  24
  25         UBYTE *indata;
  26         ULONG bitcount;
  27         ULONG bitbuf;
  28
  29         struct {
  30                 UWORD freq[628]; // freq[T + 1]
  31                 UWORD prnt[941]; // prnt[T + N_CHAR]
  32                 UWORD son[627];  // son[T];
  33         } u_deep;
  34
  35         struct {
  36                 UWORD left[1019];  // left[2 * NC - 1]
  37                 UWORD right[1028]; // right[2 * NC - 1 + 9]
  38                 UBYTE c_len[510];   // c_len[NC]
  39                 UBYTE pt_len[20];   // pt_len[NPT]
  40                 UWORD c_table[4096];
  41                 UWORD pt_table[256];
  42                 UWORD lastlen, np;
  43         } u_heavy;
  44 };
  45
  46 /* crc_csum.c */
  47 UWORD Calc_CheckSum (const UBYTE *mem, ULONG size);
  48 UWORD CreateCRC (const UBYTE *mem, ULONG size);
  49
  50 /* getbits.c */
  51 extern const ULONG mask_bits[];
  52 void initbitbuf (struct xdms_data *xdms, UBYTE *in);
  53 #define INITBITBUF(in) initbitbuf(xdms, in)
  54 #define GETBITS(n) ((UWORD)(xdms->bitbuf >> (xdms->bitcount-(n))))
  55 #define DROPBITS(n) {xdms->bitbuf &= mask_bits[xdms->bitcount-=(n)]; while (xdms->bitcount<16) {xdms->bitbuf = (xdms->bitbuf << 8) | *xdms->indata++;  xdms->bitcount += 8;}}
  56
  57 /* tables.c */
  58 extern const UBYTE d_code[];
  59 extern const UBYTE d_len[];
  60
  61 /* maketbl.c */
  62 UWORD make_table (struct xdms_data *xdms, UWORD nchar, UBYTE bitlen[],UWORD tablebits, UWORD table[]);
  63
  64 /* u_init.c */
  65 void Init_Decrunchers (struct xdms_data *xdms);
  66
  67 /* u_deep.c */
  68 UWORD Unpack_DEEP (struct xdms_data *xdms, UBYTE *in, UBYTE *out, UWORD origsize);
  69
  70 /* u_heavy.c */
  71 UWORD Unpack_HEAVY (struct xdms_data *xdms, UBYTE *in, UBYTE *out, UBYTE flags, UWORD origsize);
  72
  73 /* u_medium.c */
  74 UWORD Unpack_MEDIUM (struct xdms_data *xdms, UBYTE *in, UBYTE *out, UWORD origsize);
  75
  76 /* u_quick.c */
  77 UWORD Unpack_QUICK(struct xdms_data *xdms, UBYTE *in, UBYTE *out, UWORD origsize);
  78
  79 /* u_rle.c */
  80 UWORD Unpack_RLE (struct xdms_data *xdms, UBYTE *in, UBYTE *out, UWORD origsize);
  81
  82 #endif