const unsigned __int16 *__fastcall Aska::IdxBufComp::GenerateCompressedIndices(Aska::IdxBufComp *this, const unsigned __int16 *a2, unsigned int a3, unsigned __int8 *a4, unsigned int a5, unsigned int *a6)
{
  Aska::IdxBufComp *v6; // r5
  unsigned __int8 *v7; // r4
  const unsigned __int16 *v8; // r6
  unsigned __int8 *v9; // r7
  Aska::BitStreamWriter *v10; // r0
  signed int v11; // r9
  unsigned int v12; // r7
  unsigned int v13; // r11
  unsigned int v14; // r10
  int v15; // r1
  signed int v16; // r2
  int v17; // r0
  int v18; // r1
  signed int v19; // r3
  signed int v20; // r0
  int v21; // r0
  unsigned __int16 *v22; // r4
  int v23; // t1
  unsigned __int16 *v24; // r1
  int v25; // r3
  signed int v26; // r0
  bool v27; // cf
  unsigned int v29; // [sp+4h] [bp-64h]
  unsigned __int8 v30[4]; // [sp+8h] [bp-60h]
  unsigned __int8 v31[4]; // [sp+Ch] [bp-5Ch]
  unsigned __int8 v32[4]; // [sp+10h] [bp-58h]
  char v33; // [sp+14h] [bp-54h]
  unsigned __int8 v34[4]; // [sp+40h] [bp-28h]

  v6 = this;
  v7 = (unsigned __int8 *)a3;
  v8 = a2;
  v9 = a4;
  v29 = a3;
  *(_DWORD *)v34 = a2;
  v10 = (Aska::BitStreamWriter *)Aska::BitStreamWriter::BitStreamWriter((Aska::BitStreamWriter *)&v33);
  Aska::BitStreamWriter::Borrow(v10, v7, (unsigned int)v9);
  if ( v7 )
  {
    v8 = 0;
    if ( Aska::BitStreamWriter::WriteBits((Aska::BitStreamWriter *)&v33, v34, 0x20u) != 1
      || Aska::BitStreamWriter::WriteBits((Aska::BitStreamWriter *)&v33, (const unsigned __int8 *)v6, 0x10u) != 1 )
    {
      goto LABEL_37;
    }
    v8 = *(const unsigned __int16 **)v34;
  }
  v11 = 48;
  *(_DWORD *)v32 = *(unsigned __int16 *)v6;
  if ( (unsigned int)v8 < 2 )
  {
LABEL_36:
    v8 = (_WORD *)(&dword_0 + 1);
    *(_DWORD *)a5 = (unsigned int)(v11 + 7) >> 3;
  }
  else
  {
    v11 = 48;
    v12 = 3;
    v13 = 1;
    while ( 1 )
    {
      v14 = v13;
      if ( v13 < (unsigned int)v8 )
      {
        v15 = *(_DWORD *)v32;
        v14 = v13;
        do
        {
          v16 = 64;
          v17 = *((unsigned __int16 *)v6 + v14);
          v18 = (v17 - v15) ^ ((v17 - v15) >> 31);
          do
          {
            v19 = 0;
            if ( !v16 )
              break;
            v19 = --v16;
          }
          while ( !(v18 & (1 << v16)) );
          if ( v19 + 2 > v12 )
            break;
          ++v14;
          v15 = v17;
        }
        while ( v14 < (unsigned int)v8 );
      }
      v11 += 16;
      *(_DWORD *)v31 = v14 - v13;
      v20 = v11;
      if ( v7 )
        v20 = Aska::BitStreamWriter::WriteBits((Aska::BitStreamWriter *)&v33, v31, 0x10u);
      v8 = 0;
      if ( !v20 )
        break;
      if ( v14 > v13 )
      {
        v21 = *(_DWORD *)v32;
        if ( v7 )
        {
          v22 = (unsigned __int16 *)((char *)v6 + 2 * v13);
          while ( 1 )
          {
            *(_DWORD *)v30 = *v22 - v21;
            if ( Aska::BitStreamWriter::WriteBits((Aska::BitStreamWriter *)&v33, v30, v12) != 1 )
              break;
            v23 = *v22;
            ++v22;
            v21 = v23;
            ++v13;
            v11 += v12;
            *(_DWORD *)v32 = v23;
            if ( v13 >= v14 )
              goto LABEL_26;
          }
        }
        else
        {
          v24 = (unsigned __int16 *)((char *)v6 + 2 * v13);
          while ( 1 )
          {
            v25 = *v24;
            *(_DWORD *)v30 = v25 - v21;
            if ( -v12 == v11 )
              break;
            ++v13;
            v11 += v12;
            ++v24;
            v21 = v25;
            *(_DWORD *)v32 = v25;
            if ( v13 >= v14 )
              goto LABEL_26;
          }
        }
        break;
      }
LABEL_26:
      if ( v12 < 5 )
      {
        v7 = (unsigned __int8 *)v29;
      }
      else
      {
        v7 = (unsigned __int8 *)v29;
        v11 += 16;
        *(_DWORD *)v32 = *((unsigned __int16 *)v6 + v13);
        v26 = v11;
        if ( v29 )
          v26 = Aska::BitStreamWriter::WriteBits((Aska::BitStreamWriter *)&v33, v32, 0x10u);
        if ( !v26 )
          break;
        ++v13;
        v12 = 2;
      }
      v27 = ++v12 >= 0x1F;
      if ( v12 <= 0x1F )
      {
        v8 = *(const unsigned __int16 **)v34;
        v27 = v13 >= *(_DWORD *)v34;
      }
      if ( v27 )
        goto LABEL_36;
    }
  }
LABEL_37:
  Aska::BitStreamWriter::~BitStreamWriter((Aska::BitStreamWriter *)&v33);
  return v8;
}