prj/tech/libsrc/dstruct/huffde.c

   1 //              HUFFDE.C                Huffman decompression routines
   2 //              Rex E. Bradford
   3
   4 /*
   5 * $Header: r:/prj/lib/src/dstruct/rcs/huffde.c 1.1 1994/08/22 17:13:01 rex Exp $
   6 * $Log: huffde.c $
   7  * Revision 1.1  1994/08/22  17:13:01  rex
   8  * Initial revision
   9  *
  10 */
  11
  12 #include <string.h>
  13
  14 #include <dbg.h>
  15 #include <huff.h>
  16
  17 //      ----------------------------------------------------------------
  18 //              DECOMPRESS HUFFMAN MULTI-TABLES
  19 //      ----------------------------------------------------------------
  20 //
  21 //      HuffExpandFlashTables() compresses huffman flash-decoder tables.
  22
  23 void HuffExpandFlashTables(uchar *pFlashTab, ulong lenTab, ulong *pc,
  24         int tokSize)
  25 {
  26         uchar *pft;
  27         ulong token,runCount;
  28         int runShift;
  29
  30 //      Setup
  31
  32         pft = pFlashTab;
  33         runShift = tokSize * 8;
  34
  35 //      While still inside dest table, keep going
  36
  37         while (pft < (pFlashTab + lenTab))
  38                 {
  39
  40 //      Get next token, extract run count
  41
  42                 token = *pc++;
  43                 runCount = token >> runShift;
  44
  45 //      Copy that many times into dest
  46
  47                 while (runCount-- != 0)
  48                         {
  49                         memcpy(pft, &token, tokSize);
  50                         pft += tokSize;
  51                         }
  52                 }
  53 }
  54
  55