kc3-lang/freetype/src/gzip/inflate.c

• Show log

  Commit

• Hash : 4bdf4350
  Author :
  Date : 2003-01-30T23:24:18
  

  various improvements for 2.1.4. see ChangeLog, I've got problems with copy & paste on my desktop !!

Download

• src/gzip/inflate.c

• /* inflate.c -- zlib interface to inflate modules
   * Copyright (C) 1995-2002 Mark Adler
   * For conditions of distribution and use, see copyright notice in zlib.h
   */
  
  #include "zutil.h"
  #include "infblock.h"
  
  #define  DONE  INFLATE_DONE
  #define  BAD   INFLATE_BAD
  
  typedef enum {
        METHOD,   /* waiting for method byte */
        FLAG,     /* waiting for flag byte */
        DICT4,    /* four dictionary check bytes to go */
        DICT3,    /* three dictionary check bytes to go */
        DICT2,    /* two dictionary check bytes to go */
        DICT1,    /* one dictionary check byte to go */
        DICT0,    /* waiting for inflateSetDictionary */
        BLOCKS,   /* decompressing blocks */
        CHECK4,   /* four check bytes to go */
        CHECK3,   /* three check bytes to go */
        CHECK2,   /* two check bytes to go */
        CHECK1,   /* one check byte to go */
        DONE,     /* finished check, done */
        BAD}      /* got an error--stay here */
  inflate_mode;
  
  /* inflate private state */
  struct internal_state {
  
    /* mode */
    inflate_mode  mode;   /* current inflate mode */
  
    /* mode dependent information */
    union {
      uInt method;        /* if FLAGS, method byte */
      struct {
        uLong was;                /* computed check value */
        uLong need;               /* stream check value */
      } check;            /* if CHECK, check values to compare */
      uInt marker;        /* if BAD, inflateSync's marker bytes count */
    } sub;        /* submode */
  
    /* mode independent information */
    int  nowrap;          /* flag for no wrapper */
    uInt wbits;           /* log2(window size)  (8..15, defaults to 15) */
    inflate_blocks_statef
      *blocks;            /* current inflate_blocks state */
  
  };
  
  
  ZEXPORT(int) inflateReset( /* z) */
  z_streamp z )
  {
    if (z == Z_NULL || z->state == Z_NULL)
      return Z_STREAM_ERROR;
    z->total_in = z->total_out = 0;
    z->msg = Z_NULL;
    z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
    inflate_blocks_reset(z->state->blocks, z, Z_NULL);
    Tracev((stderr, "inflate: reset\n"));
    return Z_OK;
  }
  
  
  ZEXPORT(int) inflateEnd( /* z) */
  z_streamp z )
  {
    if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
      return Z_STREAM_ERROR;
    if (z->state->blocks != Z_NULL)
      inflate_blocks_free(z->state->blocks, z);
    ZFREE(z, z->state);
    z->state = Z_NULL;
    Tracev((stderr, "inflate: end\n"));
    return Z_OK;
  }
  
  
  ZEXPORT(int) inflateInit2_( /* z, w, version, stream_size) */
  z_streamp z,
  int w,
  const char *version,
  int stream_size )
  {
    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
        stream_size != sizeof(z_stream))
        return Z_VERSION_ERROR;
  
    /* initialize state */
    if (z == Z_NULL)
      return Z_STREAM_ERROR;
    z->msg = Z_NULL;
    if (z->zalloc == Z_NULL)
    {
      z->zalloc = zcalloc;
      z->opaque = (voidpf)0;
    }
    if (z->zfree == Z_NULL) z->zfree = zcfree;
    if ((z->state = (struct internal_state FAR *)
         ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
      return Z_MEM_ERROR;
    z->state->blocks = Z_NULL;
  
    /* handle undocumented nowrap option (no zlib header or check) */
    z->state->nowrap = 0;
    if (w < 0)
    {
      w = - w;
      z->state->nowrap = 1;
    }
  
    /* set window size */
    if (w < 8 || w > 15)
    {
      inflateEnd(z);
      return Z_STREAM_ERROR;
    }
    z->state->wbits = (uInt)w;
  
    /* create inflate_blocks state */
    if ((z->state->blocks =
        inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, (uInt)1 << w))
        == Z_NULL)
    {
      inflateEnd(z);
      return Z_MEM_ERROR;
    }
    Tracev((stderr, "inflate: allocated\n"));
  
    /* reset state */
    inflateReset(z);
    return Z_OK;
  }
  
  
  
  #undef  NEEDBYTE
  #define NEEDBYTE {if(z->avail_in==0)return r;r=f;}
  
  #undef  NEXTBYTE
  #define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
  
  
  ZEXPORT(int) inflate( /* z, f) */
  z_streamp z,
  int f )
  {
    int r;
    uInt b;
  
    if (z == Z_NULL || z->state == Z_NULL || z->next_in == Z_NULL)
      return Z_STREAM_ERROR;
    f = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
    r = Z_BUF_ERROR;
    while (1) switch (z->state->mode)
    {
      case METHOD:
        NEEDBYTE
        if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
        {
          z->state->mode = BAD;
          z->msg = (char*)"unknown compression method";
          z->state->sub.marker = 5;       /* can't try inflateSync */
          break;
        }
        if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
        {
          z->state->mode = BAD;
          z->msg = (char*)"invalid window size";
          z->state->sub.marker = 5;       /* can't try inflateSync */
          break;
        }
        z->state->mode = FLAG;
      case FLAG:
        NEEDBYTE
        b = NEXTBYTE;
        if (((z->state->sub.method << 8) + b) % 31)
        {
          z->state->mode = BAD;
          z->msg = (char*)"incorrect header check";
          z->state->sub.marker = 5;       /* can't try inflateSync */
          break;
        }
        Tracev((stderr, "inflate: zlib header ok\n"));
        if (!(b & PRESET_DICT))
        {
          z->state->mode = BLOCKS;
          break;
        }
        z->state->mode = DICT4;
      case DICT4:
        NEEDBYTE
        z->state->sub.check.need = (uLong)NEXTBYTE << 24;
        z->state->mode = DICT3;
      case DICT3:
        NEEDBYTE
        z->state->sub.check.need += (uLong)NEXTBYTE << 16;
        z->state->mode = DICT2;
      case DICT2:
        NEEDBYTE
        z->state->sub.check.need += (uLong)NEXTBYTE << 8;
        z->state->mode = DICT1;
      case DICT1:
        NEEDBYTE
        z->state->sub.check.need += (uLong)NEXTBYTE;
        z->adler = z->state->sub.check.need;
        z->state->mode = DICT0;
        return Z_NEED_DICT;
      case DICT0:
        z->state->mode = BAD;
        z->msg = (char*)"need dictionary";
        z->state->sub.marker = 0;       /* can try inflateSync */
        return Z_STREAM_ERROR;
      case BLOCKS:
        r = inflate_blocks(z->state->blocks, z, r);
        if (r == Z_DATA_ERROR)
        {
          z->state->mode = BAD;
          z->state->sub.marker = 0;       /* can try inflateSync */
          break;
        }
        if (r == Z_OK)
          r = f;
        if (r != Z_STREAM_END)
          return r;
        r = f;
        inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
        if (z->state->nowrap)
        {
          z->state->mode = DONE;
          break;
        }
        z->state->mode = CHECK4;
      case CHECK4:
        NEEDBYTE
        z->state->sub.check.need = (uLong)NEXTBYTE << 24;
        z->state->mode = CHECK3;
      case CHECK3:
        NEEDBYTE
        z->state->sub.check.need += (uLong)NEXTBYTE << 16;
        z->state->mode = CHECK2;
      case CHECK2:
        NEEDBYTE
        z->state->sub.check.need += (uLong)NEXTBYTE << 8;
        z->state->mode = CHECK1;
      case CHECK1:
        NEEDBYTE
        z->state->sub.check.need += (uLong)NEXTBYTE;
  
        if (z->state->sub.check.was != z->state->sub.check.need)
        {
          z->state->mode = BAD;
          z->msg = (char*)"incorrect data check";
          z->state->sub.marker = 5;       /* can't try inflateSync */
          break;
        }
        Tracev((stderr, "inflate: zlib check ok\n"));
        z->state->mode = DONE;
      case DONE:
        return Z_STREAM_END;
      case BAD:
        return Z_DATA_ERROR;
      default:
        return Z_STREAM_ERROR;
    }
  #ifdef NEED_DUMMY_RETURN
    return Z_STREAM_ERROR;  /* Some dumb compilers complain without this */
  #endif
  }
  
  

Download