UncompressedTFDSize.c

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#include                "libFireBird.h"
#include                "FBLib_compression.h"
 
dword UncompressedTFDSize(byte *pSrc)
{
  TRACEENTER();
 
  word                  compSize = 0, uncompSize = 0, NrBlocks = 0;
  dword                 outSize = 0, i;
 
  if(!pSrc)
  {
    TRACEEXIT();
    return 0;
  }
 
  if(LOAD_WORD(pSrc) != 8)
  {
    //Invalid header
    TRACEEXIT();
    return 0;
  }
 
  if(CRC16 (0, pSrc + 4, 6) != LOAD_WORD(pSrc + 2))
  {
    //Invalid header CRC
    TRACEEXIT();
    return 0;
  }
 
  if(LOAD_WORD(pSrc + 6) != 1)
  {
    //Invalid file version
    TRACEEXIT();
    return 0;
  }
 
  NrBlocks = LOAD_WORD(pSrc + 8);
 
  pSrc += 10;
 
  for(i = 0; i < NrBlocks; i++)
  {
    compSize   = LOAD_WORD(pSrc) - 6;
    uncompSize = LOAD_WORD(pSrc + 6);
 
    if(uncompSize > 0x7ffa)
    {
      //Uncompressed data block size too large
      TRACEEXIT();
 
      return 0;
    }
 
    pSrc += compSize + 8;
    outSize += uncompSize;
  }
 
  TRACEEXIT();
  return outSize;
}