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parse.c

/*
   Raw Photo Parser
   Copyright 2004 by Dave Coffin, dcoffin a cybercom o net

   This program extracts thumbnail images (preferably JPEGs)
   from any raw digital camera formats that have them, and
   shows table contents.

   $Revision: 1.36 $
   $Date: 2005/05/10 21:43:10 $
 */

/* Hacked for thumbnail extraction in KDE by 
   Steffen Hansen <hansen@kde.org>

   Based on parse.c and parts of dcraw.c by Dave Coffin
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <sys/types.h>

#ifdef WIN32
#include <winsock2.h>
typedef __int64 INT64;
typedef unsigned short ushort;
#else
#include <netinet/in.h>
typedef long long INT64;
#endif

/*
   TIFF and CIFF data blocks can be quite large.
   Display only the first DLEN bytes.
 */
#ifndef DLEN
#define DLEN 768
#endif

typedef unsigned char uchar;
/*typedef unsigned short ushort;*/

FILE *ifp;
short order;
char *fname;
char make[128], model[128], model2[128], thumb_head[128];
int width, height, offset, length, bps, is_dng;
int thumb_offset, thumb_length, thumb_layers;
float cam_mul[4], pre_mul[4], coeff[3][4];
#define camera_red  cam_mul[0]
#define camera_blue cam_mul[2]
/*float flash_used, canon_5814;*/
time_t timestamp;
/*int data_offset, meta_offset*/
int raw_height, raw_width, top_margin, left_margin;
static int flip = 0;

struct decode {
  struct decode *branch[2];
  int leaf;
} first_decode[640], *free_decode;

#define CLASS

#define FORC3 for (c=0; c < 3; c++)
#define FORC4 for (c=0; c < 4; c++)
#define FORCC for (c=0; c < colors; c++)

/*
   Get a 2-byte integer, making no assumptions about CPU byte order.
   Nor should we assume that the compiler evaluates left-to-right.
 */
ushort get2()
{
  uchar a, b;

  a = fgetc(ifp);  b = fgetc(ifp);

  if (order == 0x4949)        /* "II" means little-endian */
    return a | b << 8;
  else                        /* "MM" means big-endian */
    return a << 8 | b;
}

/*
   Same for a 4-byte integer.
 */
int get4()
{
  uchar a, b, c, d;

  a = fgetc(ifp);  b = fgetc(ifp);
  c = fgetc(ifp);  d = fgetc(ifp);

  if (order == 0x4949)
    return a | b << 8 | c << 16 | d << 24;
  else
    return a << 24 | b << 16 | c << 8 | d;
}

void tiff_dump(int base, int tag, int type, int count, int level)
{
  int save, j, num, den;
  uchar c;
  int size[] = { 1,1,1,2,4,8,1,1,2,4,8,4,8 };

  if (count * size[type < 13 ? type:0] > 4)
    fseek (ifp, get4()+base, SEEK_SET);
  save = ftell(ifp);
  fseek (ifp, save, SEEK_SET);
}

void nikon_decrypt (uchar ci, uchar cj, int tag, int i, int size, uchar *buf)
{
}

int parse_tiff_ifd (int base, int level);

void nef_parse_makernote (base)
{
  int offset=0, entries, tag, type, count, val, save;
  unsigned serial=0, key=0;
  uchar buf91[630], buf97[608], buf98[31];
  short sorder;
  char buf[10];

/*
   The MakerNote might have its own TIFF header (possibly with
   its own byte-order!), or it might just be a table.
 */
  sorder = order;
  fread (buf, 1, 10, ifp);
  if (!strcmp (buf,"Nikon")) {      /* starts with "Nikon\0\2\0\0\0" ? */
    base = ftell(ifp);
    order = get2();           /* might differ from file-wide byteorder */
    val = get2();       /* should be 42 decimal */
    offset = get4();
    fseek (ifp, offset-8, SEEK_CUR);
  } else if (!strncmp (buf,"FUJIFILM",8) ||
           !strcmp  (buf,"Panasonic")) {
    order = 0x4949;
    fseek (ifp,  2, SEEK_CUR);
  } else if (!strcmp (buf,"OLYMP") ||
           !strcmp (buf,"LEICA") ||
           !strcmp (buf,"EPSON"))
    fseek (ifp, -2, SEEK_CUR);
  else if (!strcmp (buf,"AOC"))
    fseek (ifp, -4, SEEK_CUR);
  else
    fseek (ifp, -10, SEEK_CUR);

  entries = get2();
  if (entries > 100) return;
  while (entries--) {
    save = ftell(ifp);
    tag  = get2();
    type = get2();
    count= get4();
    tiff_dump (base, tag, type, count, 2);
    if (tag == 0x1d)
      fscanf (ifp, "%d", &serial);
    if (tag == 0x91)
      fread (buf91, sizeof buf91, 1, ifp);
    if (tag == 0x97)
      fread (buf97, sizeof buf97, 1, ifp);
    if (tag == 0x98)
      fread (buf98, sizeof buf98, 1, ifp);
    if (tag == 0xa7)
      key = fgetc(ifp)^fgetc(ifp)^fgetc(ifp)^fgetc(ifp);

    if (tag == 0x100 && type == 7 && !strncmp(make,"OLYMPUS",7)) {
      thumb_offset = ftell(ifp);
      thumb_length = count;
    }
    if (tag == 0x280 && type == 1) {      /* EPSON */
      strncpy (thumb_head, "\xff", sizeof(thumb_head) );
      thumb_offset = ftell(ifp)+1;
      thumb_length = count-1;
    }
    if (strstr(make,"Minolta") || strstr(make,"MINOLTA")) {
      switch (tag) {
      case 0x81:
        thumb_offset = ftell(ifp);
        thumb_length = count;
        break;
      case 0x88:
        thumb_offset = get4() + base;
        break;
      case 0x89:
        thumb_length = get4();
      }
    }
    if (!strcmp (buf,"OLYMP") && tag >> 8 == 0x20)
      parse_tiff_ifd (base, 3);
    fseek (ifp, save+12, SEEK_SET);
  }
  nikon_decrypt (serial, key, 0x91,   4, sizeof buf91, buf91);
  nikon_decrypt (serial, key, 0x97, 284, sizeof buf97, buf97);
  nikon_decrypt (serial, key, 0x98,   4, sizeof buf98, buf98);
  order = sorder;
}

void nef_parse_exif(int base)
{
  int entries, tag, type, count, save;

  entries = get2();
  while (entries--) {
    save = ftell(ifp);
    tag  = get2();
    type = get2();
    count= get4();
    tiff_dump (base, tag, type, count, 1);
    if (tag == 0x927c)
      nef_parse_makernote (base);
    fseek (ifp, save+12, SEEK_SET);
  }
}

int parse_tiff_ifd (int base, int level)
{
  int entries, tag, type, count, slen, save, save2, val, i;
  int comp=0;
  static const int flip_map[] = { 0,1,3,2,4,6,7,5 };

  entries = get2();
  if (entries > 255) return 1;
  while (entries--) {
    save = ftell(ifp);
    tag  = get2();
    type = get2();
    count= get4();
    slen = count;
    if (slen > 128) slen = 128;

    tiff_dump (base, tag, type, count, level);

    save2 = ftell(ifp);
    if (type == 3)                  /* short int */
      val = get2();
    else
      val = get4();
    fseek (ifp, save2, SEEK_SET);

    if (tag > 50700 && tag < 50800)
      is_dng = 1;

    if (level == 3) {               /* Olympus E-1 and E-300 */
      if (type == 4) {
      if (tag == 0x101)
        thumb_offset = val;
      else if (tag == 0x102)
        thumb_length = val;
      }
      goto cont;
    }
    switch (tag) {
      case 0x100:             /* ImageWidth */
      if (!width)  width = val;
      break;
      case 0x101:             /* ImageHeight */
      if (!height) height = val;
      break;
      case 0x102:             /* Bits per sample */
      if (bps) break;
      bps = val;
      if (count == 1)
        thumb_layers = 1;
      break;
      case 0x103:             /* Compression */
      comp = val;
      break;
      case 0x10f:             /* Make tag */
      fgets (make, slen, ifp);
      break;
      case 0x110:             /* Model tag */
      fgets (model, slen, ifp);
      break;
      case 33405:             /* Model2 tag */
      fgets (model2, slen, ifp);
      break;
      case 0x111:             /* StripOffset */
      if (!offset || is_dng) offset = val;
      break;
      case 0x112:           /* Orientation */
      flip = flip_map[(val-1) & 7];
      break;
      case 0x117:             /* StripByteCounts */
      if (!length || is_dng) length = val;
      if (offset > val && !strncmp(make,"KODAK",5) && !is_dng)
        offset -= val;
      break;
      case 0x14a:             /* SubIFD tag */
      save2 = ftell(ifp);
      for (i=0; i < count; i++) {
        fseek (ifp, save2 + i*4, SEEK_SET);
        fseek (ifp, get4()+base, SEEK_SET);
        parse_tiff_ifd (base, level+1);
      }
      break;
      case 0x201:
      if (strncmp(make,"OLYMPUS",7) || !thumb_offset)
        thumb_offset = val;
      break;
      case 0x202:
      if (strncmp(make,"OLYMPUS",7) || !thumb_length)
        thumb_length = val;
      break;
      case 34665:
      fseek (ifp, get4()+base, SEEK_SET);
      nef_parse_exif (base);
      break;
      case 50706:
      is_dng = 1;
    }
cont:
    fseek (ifp, save+12, SEEK_SET);
  }
  if ((comp == 6 && !strcmp(make,"Canon")) ||
      (comp == 7 && is_dng)) {
    thumb_offset = offset;
    thumb_length = length;
  }
  return 0;
}

/*
   Parse a TIFF file looking for camera model and decompress offsets.
 */
void parse_tiff (int base)
{
  int doff, spp=3, ifd=0;

  width = height = offset = length = bps = is_dng = 0;
  fseek (ifp, base, SEEK_SET);
  order = get2();
  if (order != 0x4949 && order != 0x4d4d) return;
  get2();
  while ((doff = get4())) {
    fseek (ifp, doff+base, SEEK_SET);
    printf ("IFD #%d:\n", ifd++);
    if (parse_tiff_ifd (base, 0)) break;
  }
  if (is_dng) return;

  if (strncmp(make,"KODAK",5))
    thumb_layers = 0;
  if (!strncmp(make,"Kodak",5)) {
    fseek (ifp, 12+base, SEEK_SET);
    puts ("\nSpecial Kodak image directory:");
    parse_tiff_ifd (base, 0);
  }
  if (!strncmp(model,"DCS460A",7)) {
    spp = 1;
    thumb_layers = 0;
  }
  if (!thumb_length && offset) {
    thumb_offset = offset;
    sprintf (thumb_head, "P%d %d %d %d\n",
      spp > 1 ? 6:5, width, height, (1 << bps) - 1);
    thumb_length = width * height * spp * ((bps+7)/8);
  }
}

void parse_minolta()
{
  int data_offset, save, tag, len;

  fseek (ifp, 4, SEEK_SET);
  data_offset = get4() + 8;
  while ((save=ftell(ifp)) < data_offset) {
    tag = get4();
    len = get4();
    printf ("Tag %c%c%c offset %06x length %06x\n",
      tag>>16, tag>>8, tag, save, len);
    switch (tag) {
      case 0x545457:                      /* TTW */
      parse_tiff (ftell(ifp));
    }
    fseek (ifp, save+len+8, SEEK_SET);
  }
  strncpy (thumb_head, "\xff", sizeof(thumb_head) );
  thumb_offset++;
  thumb_length--;
}

/*
   Parse a CIFF file, better known as Canon CRW format.
 */
void parse_ciff (int offset, int length, int level /*unused*/)
{
  int tboff, nrecs, i, c, type, len, roff, aoff, save, wbi=-1;
  static const int remap[] = { 1,2,3,4,5,1 };
  static const int remap_10d[] = { 0,1,3,4,5,6,0,0,2,8 };
  static const int remap_s70[] = { 0,1,2,9,4,3,6,7,8,9,10,0,0,0,7,0,0,8 };
  ushort key[] = { 0x410, 0x45f3 };

  if (strcmp(model,"Canon PowerShot G6") &&
      strcmp(model,"Canon PowerShot S60") &&
      strcmp(model,"Canon PowerShot S70") &&
      strcmp(model,"Canon PowerShot Pro1"))
    key[0] = key[1] = 0;
  fseek (ifp, offset+length-4, SEEK_SET);
  tboff = get4() + offset;
  fseek (ifp, tboff, SEEK_SET);
  nrecs = get2();
  if (nrecs > 100) return;
  for (i = 0; i < nrecs; i++) {
    type = get2();
    len  = get4();
    roff = get4();
    aoff = offset + roff;
    save = ftell(ifp);
    if (type == 0x080a) {           /* Get the camera make and model */
      fseek (ifp, aoff, SEEK_SET);
      fread (make, 64, 1, ifp);
      fseek (ifp, aoff+strlen(make)+1, SEEK_SET);
      fread (model, 64, 1, ifp);
    }
    if (type == 0x102a) {           /* Find the White Balance index */
      fseek (ifp, aoff+14, SEEK_SET);     /* 0=auto, 1=daylight, 2=cloudy ... */
      wbi = get2();
      if (((!strcmp(model,"Canon EOS DIGITAL REBEL") ||
          !strcmp(model,"Canon EOS 300D DIGITAL"))) && wbi == 6)
      wbi++;
    }
    if (type == 0x102c) {           /* Get white balance (G2) */
      if (!strcmp(model,"Canon PowerShot G1") ||
        !strcmp(model,"Canon PowerShot Pro90 IS")) {
      fseek (ifp, aoff+120, SEEK_SET);
      FORC4 cam_mul[c ^ 2] = get2();
      } else {
      fseek (ifp, aoff+100, SEEK_SET);
      goto common;
      }
    }
    if (type == 0x0032) {           /* Get white balance (D30 & G3) */
      if (!strcmp(model,"Canon EOS D30")) {
      fseek (ifp, aoff+72, SEEK_SET);
common:
      camera_red   = get2() ^ key[0];
      camera_red   =(get2() ^ key[1]) / camera_red;
      camera_blue  = get2() ^ key[0];
      camera_blue /= get2() ^ key[1];
      } else if (!strcmp(model,"Canon PowerShot G6") ||
             !strcmp(model,"Canon PowerShot S60") ||
             !strcmp(model,"Canon PowerShot S70")) {
      fseek (ifp, aoff+96 + remap_s70[wbi]*8, SEEK_SET);
      goto common;
      } else if (!strcmp(model,"Canon PowerShot Pro1")) {
      fseek (ifp, aoff+96 + wbi*8, SEEK_SET);
      goto common;
      } else {
      fseek (ifp, aoff+80 + (wbi < 6 ? remap[wbi]*8 : 0), SEEK_SET);
      if (!camera_red)
        goto common;
      }
    }
    if (type == 0x10a9) {           /* Get white balance (D60) */
      if (!strcmp(model,"Canon EOS 10D"))
      wbi = remap_10d[wbi];
      fseek (ifp, aoff+2 + wbi*8, SEEK_SET);
      camera_red  = get2();
      camera_red /= get2();
      camera_blue = get2();
      camera_blue = get2() / camera_blue;
    }
      /* Skip this for now /steffen */
#if 0
    if (type == 0x1030 && (wbi == 6 || wbi == 15)) {
      fseek (ifp, aoff, SEEK_SET);  /* Get white sample */
      ciff_block_1030();
    }
#endif
    if (type == 0x1031) {           /* Get the raw width and height */
      fseek (ifp, aoff+2, SEEK_SET);
      raw_width  = get2();
      raw_height = get2();
    }
    if (type == 0x180e) {           /* Get the timestamp */
      fseek (ifp, aoff, SEEK_SET);
      timestamp = get4();
    }
    if (type == 0x580e)
      timestamp = len;
#if 0
    if (type == 0x5813)
      flash_used = *((float *) &len);
    if (type == 0x5814)
      canon_5814 = *((float *) &len);
#endif
    if (type == 0x1810) {           /* Get the rotation */
      fseek (ifp, aoff+12, SEEK_SET);
      flip = get4();
    }
      /* Skip this for now /steffen */
#if 0
    if (type == 0x1835) {           /* Get the decoder table */
      fseek (ifp, aoff, SEEK_SET);
      crw_init_tables (get4());
    }
#endif
    if (type == 0x2007) {           /* Found the JPEG thumbnail */
      thumb_offset = aoff;
      thumb_length = len;
    }
    if (type >> 8 == 0x28 || type >> 8 == 0x30) /* Get sub-tables */
      parse_ciff(aoff, len, level+1);
    fseek (ifp, save, SEEK_SET);
  }
  if (wbi == 0 && !strcmp(model,"Canon EOS D30"))
    camera_red = -1;                /* Use my auto WB for this photo */
}


void parse_mos(int level)
{
  uchar data[256];
  int i, j, skip, save;
  char *cp;

  save = ftell(ifp);
  while (1) {
    fread (data, 1, 8, ifp);
    if (strcmp(data,"PKTS")) break;
    strcpy (model, "Valeo");
    fread (data, 1, 40, ifp);
    skip = get4();
    if (!strcmp(data,"icc_camera_to_tone_matrix")) {
      for (i=0; i < skip/4; i++) {
      j = get4();
      }
      continue;
    }
    if (!strcmp(data,"JPEG_preview_data")) {
      thumb_head[0] = 0;
      thumb_offset = ftell(ifp);
      thumb_length = skip;
    }
    fread (data, 1, sizeof data, ifp);
    fseek (ifp, -sizeof data, SEEK_CUR);
    data[sizeof data - 1] = 0;
    while ((cp=index(data,'\n')))
      *cp = ' ';
    parse_mos(level+2);
    fseek (ifp, skip, SEEK_CUR);
  }
  fseek (ifp, save, SEEK_SET);
}

void parse_rollei()
{
  char line[128], *val;

  fseek (ifp, 0, SEEK_SET);
  do {
    fgets (line, 128, ifp);
    fputs (line, stdout);
    if ((val = strchr(line,'=')))
      *val++ = 0;
    else
      val = line + strlen(line);
    if (!strcmp(line,"HDR"))
      thumb_offset = atoi(val);
    if (!strcmp(line,"TX "))
      width = atoi(val);
    if (!strcmp(line,"TY "))
      height = atoi(val);
  } while (strncmp(line,"EOHD",4));
  strcpy (make, "Rollei");
  strcpy (model, "d530flex");
  thumb_length = width*height*2;
}

void rollei_decode (FILE *tfp)
{
  ushort data;
  int row, col;

  fseek (ifp, thumb_offset, SEEK_SET);
  fprintf (tfp, "P6\n%d %d\n255\n", width, height);
  for (row=0; row < height; row++)
    for (col=0; col < width; col++) {
      fread (&data, 2, 1, ifp);
      data = ntohs(data);
      putc (data << 3, tfp);
      putc (data >> 5  << 2, tfp);
      putc (data >> 11 << 3, tfp);
    }
}

void get_utf8 (int offset, char *buf, int len)
{
  ushort c;
  char *cp;

  fseek (ifp, offset, SEEK_SET);
  for (cp=buf; (c = get2()) && cp+3 < buf+len; ) {
    if (c < 0x80)
      *cp++ = c;
    else if (c < 0x800) {
      *cp++ = 0xc0 + (c >> 6);
      *cp++ = 0x80 + (c & 0x3f);
    } else {
      *cp++ = 0xe0 + (c >> 12);
      *cp++ = 0x80 + (c >> 6 & 0x3f);
      *cp++ = 0x80 + (c & 0x3f);
    }
  }
  *cp = 0;
}

ushort sget2 (uchar *s)
{
  return s[0] + (s[1]<<8);
}

int sget4 (uchar *s)
{
  return s[0] + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
}

void parse_foveon()
{
  int entries, img=0, off, len, tag, save, i, j, k, pent, poff[256][2];
  char name[128], value[128], camf[0x20000], *pos, *cp, *dp;
  unsigned val, key, type, num, ndim, dim[3];

  order = 0x4949;             /* Little-endian */
  fseek (ifp, -4, SEEK_END);
  fseek (ifp, get4(), SEEK_SET);
  if (get4() != 0x64434553) { /* SECd */
    printf ("Bad Section identifier at %6x\n", (int)ftell(ifp)-4);
    return;
  }
  get4();
  entries = get4();
  while (entries--) {
    off = get4();
    len = get4();
    tag = get4();
    save = ftell(ifp);
    fseek (ifp, off, SEEK_SET);
    if (get4() != (0x20434553 | (tag << 24))) {
      printf ("Bad Section identifier at %6x\n", off);
      goto next;
    }
    val = get4();
    switch (tag) {
      case 0x32414d49:              /* IMA2 */
      case 0x47414d49:              /* IMAG */
      if (++img == 2) {       /* second image */
        thumb_offset = off;
        thumb_length = 1;
      }
      printf ("type %d, "     , get4());
      printf ("format %2d, "  , get4());
      printf ("columns %4d, " , get4());
      printf ("rows %4d, "    , get4());
      printf ("rowsize %d\n"  , get4());
      break;
      case 0x464d4143:              /* CAMF */
      printf ("type %d, ", get4());
      get4();
      for (i=0; i < 4; i++)
        putchar(fgetc(ifp));
      val = get4();
      printf (" version %d.%d:\n",val >> 16, val & 0xffff);
      key = get4();
      if ((len -= 28) > 0x20000)
        len = 0x20000;
      fread (camf, 1, len, ifp);
      for (i=0; i < len; i++) {
        key = (key * 1597 + 51749) % 244944;
        val = key * (INT64) 301593171 >> 24;
        camf[i] ^= ((((key << 8) - val) >> 1) + val) >> 17;
      }
      for (pos=camf; (unsigned) (pos-camf) < len; pos += sget4(pos+8)) {
        if (strncmp (pos, "CMb", 3)) {
          printf("Bad CAMF tag \"%.4s\"\n", pos);
          break;
        }
        val = sget4(pos+4);
        printf ("  %4.4s version %d.%d: ", pos, val >> 16, val & 0xffff);
        switch (pos[3]) {
          case 'M':
            cp = pos + sget4(pos+16);
            type = sget4(cp);
            ndim = sget4(cp+4);
            dim[0] = dim[1] = dim[2] = 1;
            printf ("%d-dimensonal array %s of type %d:\n    Key: (",
            ndim, pos+sget4(pos+12), sget4(cp));
            dp = pos + sget4(cp+8);
            for (i=ndim; i--; ) {
            cp += 12;
            dim[i] = sget4(cp);
            printf ("%s %d%s", pos+sget4(cp+4), dim[i], i ? ", ":")\n");
            }
            for (i=0; i < dim[2]; i++) {
            for (j=0; j < dim[1]; j++) {
              printf ("    ");
              for (k=0; k < dim[0]; k++)
                switch (type) {
                  case 0:
                  case 6:
                  printf ("%7d", sget2(dp));
                  dp += 2;
                  break;
                  case 1:
                  case 2:
                  printf (" %d", sget4(dp));
                  dp += 4;
                  break;
                  case 3: {
                        union { int ival; float fval; } __t;
                  __t.ival = sget4(dp);
                  printf (" %9f", __t.fval);
                  dp += 4;
                      }
                }
              printf ("\n");
            }
            printf ("\n");
            }
            break;
          case 'P':
            val = sget4(pos+16);
            num = sget4(pos+val);
            printf ("%s, %d parameters:\n", pos+sget4(pos+12), num);
            cp = pos+val+8 + num*8;
            for (i=0; i < num; i++) {
            val += 8;
            printf ("    %s = %s\n", cp+sget4(pos+val), cp+sget4(pos+val+4));
            }
            break;
          case 'T':
            cp = pos + sget4(pos+16);
            printf ("%s = %.*s\n", pos+sget4(pos+12), sget4(cp), cp+4);
            break;
          default:
            printf ("\n");
        }
      }
      break;
      case 0x504f5250:              /* PROP */
      printf ("entries %d, ", pent=get4());
      printf ("charset %d, ", get4());
      get4();
      printf ("nchars %d\n", get4());
      off += pent*8 + 24;
      if (pent > 256) pent=256;
      for (i=0; i < pent*2; i++)
        poff[0][i] = off + get4()*2;
      for (i=0; i < pent; i++) {
        get_utf8 (poff[i][0], name, 128);
        get_utf8 (poff[i][1], value, 128);
        printf ("  %s = %s\n", name, value);
        if (!strcmp (name,"CAMMANUF"))
          strncpy (make, value, sizeof(make));
        if (!strcmp (name,"CAMMODEL"))
          strncpy (model, value, sizeof(value));
      }
    }
next:
    fseek (ifp, save, SEEK_SET);
  }
}

void foveon_tree (unsigned huff[1024], unsigned code)
{
  struct decode *cur;
  int i, len;

  cur = free_decode++;
  if (code) {
    for (i=0; i < 1024; i++)
      if (huff[i] == code) {
      cur->leaf = i;
      return;
      }
  }
  if ((len = code >> 27) > 26) return;
  code = (len+1) << 27 | (code & 0x3ffffff) << 1;

  cur->branch[0] = free_decode;
  foveon_tree (huff, code);
  cur->branch[1] = free_decode;
  foveon_tree (huff, code+1);
}

void foveon_decode (FILE *tfp)
{
  int bwide, row, col, bit=-1, c, i;
  char *buf;
  struct decode *dindex;
  short pred[3];
  unsigned huff[1024], bitbuf=0;

  fseek (ifp, thumb_offset+16, SEEK_SET);
  width  = get4();
  height = get4();
  bwide  = get4();
  fprintf (tfp, "P6\n%d %d\n255\n", width, height);
  if (bwide > 0) {
    buf = malloc(bwide);
    for (row=0; row < height; row++) {
      fread  (buf, 1, bwide, ifp);
      fwrite (buf, 3, width, tfp);
    }
    free (buf);
    return;
  }
  for (i=0; i < 256; i++)
    huff[i] = get4();
  memset (first_decode, 0, sizeof first_decode);
  free_decode = first_decode;
  foveon_tree (huff, 0);

  for (row=0; row < height; row++) {
    memset (pred, 0, sizeof pred);
    if (!bit) get4();
    for (col=bit=0; col < width; col++) {
      for (c=0; c < 3; c++) {
      for (dindex=first_decode; dindex->branch[0]; ) {
        if ((bit = (bit-1) & 31) == 31)
          for (i=0; i < 4; i++)
            bitbuf = (bitbuf << 8) + fgetc(ifp);
        dindex = dindex->branch[bitbuf >> bit & 1];
      }
      pred[c] += dindex->leaf;
      fputc (pred[c], tfp);
      }
    }
  }
}

void kodak_yuv_decode (FILE *tfp)
{
  uchar c, blen[384];
  unsigned col, len, bits=0;
  int row;
  INT64 bitbuf=0;
  int i, li=0, si, diff, six[6], y[4], cb=0, cr=0, rgb[3];
  ushort *out, *op;

  fseek (ifp, thumb_offset, SEEK_SET);
  width = (width+1) & -2;
  height = (height+1) & -2;
  fprintf (tfp, "P6\n%d %d\n65535\n", width, height);
  out = malloc (width * 12);
  if (!out) {
    fprintf (stderr, "kodak_yuv_decode() malloc failed!\n");
    exit(1);
  }

  for (row=0; row < height; row+=2) {
    for (col=0; col < width; col+=2) {
      if ((col & 127) == 0) {
      len = (width - col + 1) * 3 & -4;
      if (len > 384) len = 384;
      for (i=0; i < len; ) {
        c = fgetc(ifp);
        blen[i++] = c & 15;
        blen[i++] = c >> 4;
      }
      li = bitbuf = bits = y[1] = y[3] = cb = cr = 0;
      if (len % 8 == 4) {
        bitbuf  = fgetc(ifp) << 8;
        bitbuf += fgetc(ifp);
        bits = 16;
      }
      }
      for (si=0; si < 6; si++) {
      len = blen[li++];
      if (bits < len) {
        for (i=0; i < 32; i+=8)
          bitbuf += (INT64) fgetc(ifp) << (bits+(i^8));
        bits += 32;
      }
      diff = bitbuf & (0xffff >> (16-len));
      bitbuf >>= len;
      bits -= len;
      if ((diff & (1 << (len-1))) == 0)
        diff -= (1 << len) - 1;
      six[si] = diff;
      }
      y[0] = six[0] + y[1];
      y[1] = six[1] + y[0];
      y[2] = six[2] + y[3];
      y[3] = six[3] + y[2];
      cb  += six[4];
      cr  += six[5];
      for (i=0; i < 4; i++) {
      op = out + ((i >> 1)*width + col+(i & 1)) * 3;
      rgb[0] = y[i] + 1.40200/2 * cr;
      rgb[1] = y[i] - 0.34414/2 * cb - 0.71414/2 * cr;
      rgb[2] = y[i] + 1.77200/2 * cb;
      for (c=0; c < 3; c++)
        if (rgb[c] > 0) op[c] = htons(rgb[c]);
      }
    }
    fwrite (out, sizeof *out, width*6, tfp);
  }
  free(out);
}

void parse_phase_one (int base)
{
  unsigned entries, tag, type, len, data, save;
  char str[256];

  fseek (ifp, base + 8, SEEK_SET);
  fseek (ifp, base + get4(), SEEK_SET);
  entries = get4();
  get4();
  while (entries--) {
    tag  = get4();
    type = get4();
    len  = get4();
    data = get4();
    save = ftell(ifp);
    printf ("Phase One tag=0x%x, type=%d, len=%2d, data = 0x%x\n",
            tag, type, len, data);
    if (type == 1 && len < 256) {
      fseek (ifp, base + data, SEEK_SET);
      fread (str, 256, 1, ifp);
      puts (str);
    }
    if (tag == 0x110) {
      thumb_offset = data + base;
      thumb_length = len;
    }
    fseek (ifp, save, SEEK_SET);
  }
  strcpy (make, "Phase One");
  strcpy (model, "unknown");
}

void parse_jpeg (int offset)
{
  int len, save, hlen;

  fseek (ifp, offset, SEEK_SET);
  if (fgetc(ifp) != 0xff || fgetc(ifp) != 0xd8) return;

  while (fgetc(ifp) == 0xff && fgetc(ifp) >> 4 != 0xd) {
    order = 0x4d4d;
    len   = get2() - 2;
    save  = ftell(ifp);
    order = get2();
    hlen  = get4();
    if (get4() == 0x48454150)       /* "HEAP" */
      parse_ciff (save+hlen, len-hlen, 0);
    parse_tiff (save+6);
    fseek (ifp, save+len, SEEK_SET);
  }
}


#ifndef _GNU_SOURCE
char *memmem (char *haystack, size_t haystacklen,
              char *needle, size_t needlelen)
{
  char *c;
  for (c = haystack; c <= haystack + haystacklen - needlelen; c++)
    if (!memcmp (c, needle, needlelen))
      return c;
  return NULL;
}
#endif

/*
   Identify which camera created this file, and set global variables
   accordingly.    
   Return nonzero if the file cannot be decoded or no thumbnail is found
 */
int identify(FILE* tfp)
{
  char head[32], *thumb, *rgb, *cp;
  unsigned hlen, fsize, toff, tlen, lsize;
  int i;

  make[0] = model[0] = model2[0] = is_dng = 0;
  thumb_head[0] = thumb_offset = thumb_length = thumb_layers = 0;
  order = get2();
  hlen = get4();
  fseek (ifp, 0, SEEK_SET);
  fread (head, 1, 32, ifp);
  fseek (ifp, 0, SEEK_END);
  fsize = ftell(ifp);
  if ((cp = memmem (head, 32, "MMMMRawT", 8)) ||
      (cp = memmem (head, 32, "IIIITwaR", 8)))
    parse_phase_one (cp - head);
  else if (order == 0x4949 || order == 0x4d4d) {
    if (!memcmp(head+6,"HEAPCCDR",8)) {
      parse_ciff (hlen, fsize - hlen, 0);
      fseek (ifp, hlen, SEEK_SET);
    } else
      parse_tiff (0);
  } else if (!memcmp (head, "\0MRM", 4))
    parse_minolta();
    else if (!memcmp (head, "\xff\xd8\xff\xe1", 4) &&
           !memcmp (head+6, "Exif", 4)) {
    parse_tiff (12);
    thumb_length = 0;
  } else if (!memcmp (head, "FUJIFILM", 8)) {
    fseek (ifp, 84, SEEK_SET);
    toff = get4();
    tlen = get4();
    thumb_offset = toff;
    thumb_length = tlen;
  } else if (!memcmp (head, "DSC-Image", 9))
    parse_rollei();
  else if (!memcmp (head, "FOVb", 4))
    parse_foveon();
  fseek (ifp, 8, SEEK_SET);
  parse_mos(0);
  fseek (ifp, 3472, SEEK_SET);
  parse_mos(0);
  parse_jpeg(0);

  if (!thumb_length) {
    fprintf (stderr, "Thumbnail image not found\n");
    return -1;
  }

  if (is_dng) goto dng_skip;
  if (!strncmp(model,"DCS Pro",7)) {
    kodak_yuv_decode (tfp);
    goto done;
  }
  if (!strcmp(make,"Rollei")) {
    rollei_decode (tfp);
    goto done;
  }
  if (!strcmp(make,"SIGMA")) {
    foveon_decode (tfp);
    goto done;
  }
dng_skip:
  thumb = (char *) malloc(thumb_length);
  if (!thumb) {
    fprintf (stderr, "Cannot allocate %d bytes!!\n", thumb_length);
    exit(1);
  }
  fseek (ifp, thumb_offset, SEEK_SET);
  fread (thumb, 1, thumb_length, ifp);
  if (thumb_layers && !is_dng) {
    rgb = (char *) malloc(thumb_length);
    if (!rgb) {
      fprintf (stderr, "Cannot allocate %d bytes!!\n", thumb_length);
      return -1;
    }
    lsize = thumb_length/3;
    for (i=0; i < thumb_length; i++)
      rgb[(i%lsize)*3 + i/lsize] = thumb[i];
    free(thumb);
    thumb = rgb;
  }
  fputs (thumb_head, tfp);
  fwrite(thumb, 1, thumb_length, tfp);
  free (thumb);
done:
  fprintf (stderr, "Thumbnail image written, make=%s, model=%s\n",&(make[0]),&(model[0]));
  return 0;
}

int extract_thumbnail( FILE* input, FILE* output, int* orientation )
{
  /* Coffin's code has different meaning for orientation
       values than TIFF, so we map them to TIFF values */
  static const int flip_map[] = { 0,1,3,2,4,7,5,6 };
  int rc;
  ifp = input;
  rc = identify(output);
  switch ((flip+3600) % 360) {
  case 270:  flip = 5;  break;
  case 180:  flip = 3;  break;
  case  90:  flip = 6;
  }
  if( orientation ) *orientation = flip_map[flip%7];
  return rc;
}

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