source-engine/utils/lzma/C/LzmaLib.c

/* LzmaLib.c -- LZMA library wrapper
2008-08-05
Igor Pavlov
Public domain */

#include "LzmaEnc.h"
#include "LzmaDec.h"
#include "Alloc.h"
#include "LzmaLib.h"

static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); }
static void SzFree(void *p, void *address) { p = p; MyFree(address); }
static ISzAlloc g_Alloc = { SzAlloc, SzFree };

MY_STDAPI LzmaCompress(unsigned char *dest, size_t  *destLen, const unsigned char *src, size_t  srcLen,
  unsigned char *outProps, size_t *outPropsSize,
  int level, /* 0 <= level <= 9, default = 5 */
  unsigned dictSize, /* use (1 << N) or (3 << N). 4 KB < dictSize <= 128 MB */
  int lc, /* 0 <= lc <= 8, default = 3  */
  int lp, /* 0 <= lp <= 4, default = 0  */
  int pb, /* 0 <= pb <= 4, default = 2  */
  int fb,  /* 5 <= fb <= 273, default = 32 */
  int numThreads /* 1 or 2, default = 2 */
)
{
  CLzmaEncProps props;
  LzmaEncProps_Init(&props);
  props.level = level;
  props.dictSize = dictSize;
  props.lc = lc;
  props.lp = lp;
  props.pb = pb;
  props.fb = fb;
  props.numThreads = numThreads;

  return LzmaEncode(dest, destLen, src, srcLen, &props, outProps, outPropsSize, 0,
      NULL, &g_Alloc, &g_Alloc);
}


MY_STDAPI LzmaUncompress(unsigned char *dest, size_t  *destLen, const unsigned char *src, size_t  *srcLen,
  const unsigned char *props, size_t propsSize)
{
  ELzmaStatus status;
  return LzmaDecode(dest, destLen, src, srcLen, props, (unsigned)propsSize, LZMA_FINISH_ANY, &status, &g_Alloc);
}