third_party/soloud_speech/darray.cpp

   1 #include <stdlib.h>
   2 #include <string.h>
   3 #include "darray.h"
   4
   5 darray::darray()
   6 {
   7         mAllocChunk = 128;
   8         mAllocated = mUsed = 0;
   9         mData = NULL;
  10 }
  11
  12 void darray::clear()
  13 {
  14         free(mData);
  15         mAllocChunk = 128;
  16         mAllocated = mUsed = 0;
  17         mData = NULL;
  18 }
  19
  20 darray::~darray()
  21 {
  22         clear();
  23 }
  24
  25 char * darray::getDataInPos(int aPosition)
  26 {
  27         if (aPosition < mAllocated && aPosition < mUsed)
  28                 return mData + aPosition;
  29
  30         if (aPosition >= mAllocated)
  31         {
  32                 int newsize = mAllocated;
  33
  34                 while (newsize <= aPosition)
  35                 {
  36                         newsize += mAllocChunk;
  37                         mAllocChunk *= 2;
  38                 }
  39
  40                 char *newdata = (char*)realloc(mData, newsize);
  41                 if (!newdata)
  42                 {
  43                         free(mData);
  44                         mData = NULL;
  45                         mAllocated = mUsed = 0;
  46                         return NULL;
  47                 }
  48                 else
  49                 {
  50                         memset(newdata + mAllocated, 0, newsize - mAllocated);
  51                 }
  52
  53                 mData = newdata;
  54                 mAllocated = newsize;
  55         }
  56
  57         if (aPosition >= mUsed)
  58         {
  59                 mUsed = aPosition + 1;
  60         }
  61
  62         return mData + aPosition;
  63 }
  64
  65 void darray::put(int aData)
  66 {
  67         char *s = getDataInPos(mUsed);
  68
  69         *s = (char)aData;
  70 }