Commit message: https://github.com/ImageMagick/ImageMagick/issues/96
CVE: CVE-2016-7524
CWE: CWE-125
Vulnerability description: coders/meta.c in ImageMagick allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted file.

Project: ImageMagick
File: meta.c

static ssize_t parse8BIMW(Image *ifile, Image *ofile)
{
  char
    brkused,
    quoted,
    *line,
    *token,
    *newstr,
    *name;

  int
    state,
    next;

  unsigned char
    dataset;

  unsigned int
    recnum;

  int
    inputlen = MagickPathExtent;

  ssize_t
    savedolen = 0L,
    outputlen = 0L;

  MagickOffsetType
    savedpos,
    currentpos;

  TokenInfo
    *token_info;

  dataset = 0;
  recnum = 0;
  line=(char *) AcquireQuantumMemory((size_t) inputlen,sizeof(*line));
  if (line == (char *) NULL)
    return(-1);
  newstr = name = token = (char *) NULL;
  savedpos = 0;
  token_info=AcquireTokenInfo();
  while (super_fgets_w(&line,&inputlen,ifile) != NULL)
  {
    state=0;
    next=0;

    token=(char *) AcquireQuantumMemory((size_t) inputlen,sizeof(*token));
    if (token == (char *) NULL)
      break;
    newstr=(char *) AcquireQuantumMemory((size_t) inputlen,sizeof(*newstr));
    if (newstr == (char *) NULL)
      break;
    while (Tokenizer(token_info,0,token,(size_t) inputlen,line,"","=","\"",0,
      &brkused,&next,&quoted)==0)
    {
      if (state == 0)
        {
          int
            state,
            next;

          char
            brkused,
            quoted;

          state=0;
          next=0;
          while (Tokenizer(token_info,0,newstr,(size_t) inputlen,token,"","#",
            "",0,&brkused,&next,&quoted)==0)
          {
            switch (state)
            {
              case 0:
                if (strcmp(newstr,"8BIM")==0)
                  dataset = 255;
                else
                  dataset = (unsigned char) StringToLong(newstr);
                break;
              case 1:
                recnum=(unsigned int) StringToUnsignedLong(newstr);
                break;
              case 2:
                name=(char *) AcquireQuantumMemory(strlen(newstr)+MagickPathExtent,
                  sizeof(*name));
                if (name)
                  (void) CopyMagickString(name,newstr,strlen(newstr)+MagickPathExtent);
                break;
            }
            state++;
          }
        }
      else
        if (state == 1)
          {
            int
              next;

            ssize_t
              len;

            char
              brkused,
              quoted;

            next=0;
            len = (ssize_t) strlen(token);
            while (Tokenizer(token_info,0,newstr,(size_t) inputlen,token,"","&",
              "",0,&brkused,&next,&quoted)==0)
            {
              if (brkused && next > 0)
                {
                  char
                    *s = &token[next-1];

                  len -= (ssize_t) convertHTMLcodes(s,(int) strlen(s));
                }
            }

            if (dataset == 255)
              {
                unsigned char
                  nlen = 0;

                int
                  i;

                if (savedolen > 0)
                  {
                    MagickOffsetType
                      offset;

                    ssize_t diff = outputlen - savedolen;
                    currentpos = TellBlob(ofile);
                    if (currentpos < 0)
                      return(-1);
                    offset=SeekBlob(ofile,savedpos,SEEK_SET);
                    if (offset < 0)
                      return(-1);
                    (void) WriteBlobMSBLong(ofile,(unsigned int) diff);
                    offset=SeekBlob(ofile,currentpos,SEEK_SET);
                    if (offset < 0)
                      return(-1);
                    savedolen = 0L;
                  }
                if (outputlen & 1)
                  {
                    (void) WriteBlobByte(ofile,0x00);
                    outputlen++;
                  }
                (void) WriteBlobString(ofile,"8BIM");
                (void) WriteBlobMSBShort(ofile,(unsigned short) recnum);
                outputlen += 6;
                if (name)
                  nlen = (unsigned char) strlen(name);
                (void) WriteBlobByte(ofile,(unsigned char) nlen);
                outputlen++;
                for (i=0; i<nlen; i++)
                  (void) WriteBlobByte(ofile,(unsigned char) name[i]);
                outputlen += nlen;
                if ((nlen & 0x01) == 0)
                  {
                    (void) WriteBlobByte(ofile,0x00);
                    outputlen++;
                  }
                if (recnum != IPTC_ID)
                  {
                    (void) WriteBlobMSBLong(ofile,(unsigned int) len);
                    outputlen += 4;

                    next=0;
                    outputlen += len;
                    while (len--)
                      (void) WriteBlobByte(ofile,(unsigned char) token[next++]);

                    if (outputlen & 1)
                      {
                        (void) WriteBlobByte(ofile,0x00);
                        outputlen++;
                      }
                  }
                else
                  {
                    /* patch in a fake length for now and fix it later */
                    savedpos = TellBlob(ofile);
                    if (savedpos < 0)
                      return(-1);
                    (void) WriteBlobMSBLong(ofile,0xFFFFFFFFU);
                    outputlen += 4;
                    savedolen = outputlen;
                  }
              }
            else
              {
                if (len <= 0x7FFF)
                  {
                    (void) WriteBlobByte(ofile,0x1c);
                    (void) WriteBlobByte(ofile,dataset);
                    (void) WriteBlobByte(ofile,(unsigned char) (recnum & 0xff));
                    (void) WriteBlobMSBShort(ofile,(unsigned short) len);
                    outputlen += 5;
                    next=0;
                    outputlen += len;
                    while (len--)
                      (void) WriteBlobByte(ofile,(unsigned char) token[next++]);
                  }
              }
          }
      state++;
    }
    if (token != (char *) NULL)
      token=DestroyString(token);
    if (newstr != (char *) NULL)
      newstr=DestroyString(newstr);
    if (name != (char *) NULL)
      name=DestroyString(name);
  }
  token_info=DestroyTokenInfo(token_info);
  if (token != (char *) NULL)
    token=DestroyString(token);
  if (newstr != (char *) NULL)
    newstr=DestroyString(newstr);
  if (name != (char *) NULL)
    name=DestroyString(name);
  line=DestroyString(line);
  if (savedolen > 0)
    {
      MagickOffsetType
        offset;

      ssize_t diff = outputlen - savedolen;

      currentpos = TellBlob(ofile);
      if (currentpos < 0)
        return(-1);
      offset=SeekBlob(ofile,savedpos,SEEK_SET);
      if (offset < 0)
        return(-1);
      (void) WriteBlobMSBLong(ofile,(unsigned int) diff);
      offset=SeekBlob(ofile,currentpos,SEEK_SET);
      if (offset < 0)
        return(-1);
      savedolen = 0L;
    }
  return(outputlen);
}

Project: ImageMagick
File: meta.c

ModuleExport size_t RegisterMETAImage(void)
{
  MagickInfo
    *entry;

  entry=AcquireMagickInfo("META","8BIM","Photoshop resource format");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","8BIMTEXT","Photoshop resource text format");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","8BIMWTEXT",
    "Photoshop resource wide text format");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","APP1","Raw application information");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","APP1JPEG","Raw JPEG binary data");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","EXIF","Exif digital camera binary data");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","XMP","Adobe XML metadata");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","ICM","ICC Color Profile");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","ICC","ICC Color Profile");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","IPTC","IPTC Newsphoto");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","IPTCTEXT","IPTC Newsphoto text format");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  entry=AcquireMagickInfo("META","IPTCWTEXT","IPTC Newsphoto text format");
  entry->decoder=(DecodeImageHandler *) ReadMETAImage;
  entry->encoder=(EncodeImageHandler *) WriteMETAImage;
  entry->flags^=CoderAdjoinFlag;
  entry->flags|=CoderStealthFlag;
  entry->flags|=CoderSeekableStreamFlag;
  (void) RegisterMagickInfo(entry);
  return(MagickImageCoderSignature);
}

Project: ImageMagick
File: meta.c

static int convertHTMLcodes(char *s, int len)
{
  if (len <=0 || s==(char*) NULL || *s=='\0')
    return 0;

  if (s[1] == '#')
    {
      int val, o;

      if (sscanf(s,"&#%d;",&val) == 1)
      {
        o = 3;
        while (s[o] != ';')
        {
          o++;
          if (o > 5)
            break;
        }
        if (o < 6)
          (void) memmove(s+1,s+1+o,strlen(s+1+o)+1);
        *s = val;
        return o;
      }
    }
  else
    {
      int
        i,
        codes = (int) (sizeof(html_codes) / sizeof(html_code));

      for (i=0; i < codes; i++)
      {
        if (html_codes[i].len <= len)
          if (stringnicmp(s,html_codes[i].code,(size_t) html_codes[i].len) == 0)
            {
              (void) memmove(s+1,s+html_codes[i].len,
                strlen(s+html_codes[i].len)+1);
              *s=html_codes[i].val;
              return html_codes[i].len-1;
            }
      }
    }
  return 0;
}

Project: ImageMagick
File: meta.c

ModuleExport void UnregisterMETAImage(void)
{
  (void) UnregisterMagickInfo("8BIM");
  (void) UnregisterMagickInfo("8BIMTEXT");
  (void) UnregisterMagickInfo("8BIMWTEXT");
  (void) UnregisterMagickInfo("EXIF");
  (void) UnregisterMagickInfo("APP1");
  (void) UnregisterMagickInfo("APP1JPEG");
  (void) UnregisterMagickInfo("ICCTEXT");
  (void) UnregisterMagickInfo("ICM");
  (void) UnregisterMagickInfo("ICC");
  (void) UnregisterMagickInfo("IPTC");
  (void) UnregisterMagickInfo("IPTCTEXT");
  (void) UnregisterMagickInfo("IPTCWTEXT");
  (void) UnregisterMagickInfo("XMP");
}

Project: ImageMagick
File: meta.c

static char *super_fgets_w(char **b, int *blen, Image *file)
{
  int
    c,
    len;

  unsigned char
    *p,
    *q;

  len=*blen;
  p=(unsigned char *) (*b);
  for (q=p; ; q++)
  {
    c=(int) ReadBlobLSBShort(file);
    if ((c == -1) || (c == '\n'))
      break;
   if (EOFBlob(file))
      break;
   if ((q-p+1) >= (int) len)
      {
        int
          tlen;

        tlen=q-p;
        len<<=1;
        p=(unsigned char *) ResizeQuantumMemory(p,(size_t) (len+2),sizeof(*p));
        *b=(char *) p;
        if (p == (unsigned char *) NULL)
          break;
        q=p+tlen;
      }
    *q=(unsigned char) c;
  }
  *blen=0;
  if ((*b) != (char *) NULL)
    {
      int
        tlen;

      tlen=q-p;
      if (tlen == 0)
        return (char *) NULL;
      p[tlen] = '\0';
      *blen=++tlen;
    }
  return((char *) p);
}

Project: ImageMagick
File: meta.c

static int format8BIM(Image *ifile, Image *ofile)
{
  char
    temp[MagickPathExtent];

  unsigned int
    foundOSType;

  int
    ID,
    resCount,
    i,
    c;

  ssize_t
    count;

  unsigned char
    *PString,
    *str;

  resCount=0;
  foundOSType=0; /* found the OSType */
  (void) foundOSType;
  c=ReadBlobByte(ifile);
  while (c != EOF)
  {
    if (c == '8')
      {
        unsigned char
          buffer[5];

        buffer[0]=(unsigned char) c;
        for (i=1; i<4; i++)
        {
          c=ReadBlobByte(ifile);
          if (c == EOF)
            return(-1);
          buffer[i] = (unsigned char) c;
        }
        buffer[4]=0;
        if (strcmp((const char *)buffer, "8BIM") == 0)
          foundOSType=1;
        else
          continue;
      }
    else
      {
        c=ReadBlobByte(ifile);
        continue;
      }
    /*
      We found the OSType (8BIM) and now grab the ID, PString, and Size fields.
    */
    ID=(int) ReadBlobMSBShort(ifile);
    if (ID < 0)
      return(-1);
    {
      unsigned char
        plen;

      c=ReadBlobByte(ifile);
      if (c == EOF)
        return(-1);
      plen = (unsigned char) c;
      PString=(unsigned char *) AcquireQuantumMemory((size_t) (plen+
        MagickPathExtent),sizeof(*PString));
      if (PString == (unsigned char *) NULL)
        {
          printf("MemoryAllocationFailed");
          return 0;
        }
      for (i=0; i<plen; i++)
      {
        c=ReadBlobByte(ifile);
        if (c == EOF) return -1;
        PString[i] = (unsigned char) c;
      }
      PString[ plen ] = 0;
      if ((plen & 0x01) == 0)
      {
        c=ReadBlobByte(ifile);
        if (c == EOF)
          return(-1);
      }
    }
    count = (int) ReadBlobMSBLong(ifile);
    if (count < 0) return -1;
    /* make a buffer to hold the datand snag it from the input stream */
    str=(unsigned char *) AcquireQuantumMemory((size_t) count,sizeof(*str));
    if (str == (unsigned char *) NULL)
      {
        printf("MemoryAllocationFailed");
        return 0;
      }
    for (i=0; i < (ssize_t) count; i++)
    {
      c=ReadBlobByte(ifile);
      if (c == EOF)
        return(-1);
      str[i]=(unsigned char) c;
    }

    /* we currently skip thumbnails, since it does not make
     * any sense preserving them in a real world application
     */
    if (ID != THUMBNAIL_ID)
      {
        /* now finish up by formatting this binary data into
         * ASCII equivalent
         */
        if (strlen((const char *)PString) > 0)
          (void) FormatLocaleString(temp,MagickPathExtent,"8BIM#%d#%s=",ID,
            PString);
        else
          (void) FormatLocaleString(temp,MagickPathExtent,"8BIM#%d=",ID);
        (void) WriteBlobString(ofile,temp);
        if (ID == IPTC_ID)
          {
            formatString(ofile, "IPTC", 4);
            formatIPTCfromBuffer(ofile, (char *)str, (ssize_t) count);
          }
        else
          formatString(ofile, (char *)str, (ssize_t) count);
      }
    str=(unsigned char *) RelinquishMagickMemory(str);
    PString=(unsigned char *) RelinquishMagickMemory(PString);
    resCount++;
    c=ReadBlobByte(ifile);
  }
  return resCount;
}

Project: ImageMagick
File: meta.c

static int formatIPTCfromBuffer(Image *ofile, char *s, ssize_t len)
{
  char
    temp[MagickPathExtent];

  unsigned int
    foundiptc,
    tagsfound;

  unsigned char
    recnum,
    dataset;

  unsigned char
    *readable,
    *str;

  ssize_t
    tagindx,
    taglen;

  int
    i,
    tagcount = (int) (sizeof(tags) / sizeof(tag_spec));

  int
    c;

  foundiptc = 0; /* found the IPTC-Header */
  tagsfound = 0; /* number of tags found */

  while (len > 0)
  {
    c = *s++; len--;
    if (c == 0x1c)
      foundiptc = 1;
    else
      {
        if (foundiptc)
          return -1;
        else
          continue;
      }
    /*
      We found the 0x1c tag and now grab the dataset and record number tags.
    */
    c = *s++; len--;
    if (len < 0) return -1;
    dataset = (unsigned char) c;
    c = *s++; len--;
    if (len < 0) return -1;
    recnum = (unsigned char) c;
    /* try to match this record to one of the ones in our named table */
    for (i=0; i< tagcount; i++)
      if (tags[i].id == (short) recnum)
        break;
    if (i < tagcount)
      readable=(unsigned char *) tags[i].name;
    else
      readable=(unsigned char *) "";
    /*
      We decode the length of the block that follows - ssize_t or short fmt.
    */
    c=(*s++);
    len--;
    if (len < 0)
      return(-1);
    if (c & (unsigned char) 0x80)
      return(0);
    else
      {
        s--;
        len++;
        taglen=readWordFromBuffer(&s, &len);
      }
    if (taglen < 0)
      return(-1);
    if (taglen > 65535)
      return(-1);
    /* make a buffer to hold the tag datand snag it from the input stream */
    str=(unsigned char *) AcquireQuantumMemory((size_t) (taglen+MagickPathExtent),
      sizeof(*str));
    if (str == (unsigned char *) NULL)
      {
        printf("MemoryAllocationFailed");
        return 0;
      }
    for (tagindx=0; tagindx<taglen; tagindx++)
    {
      c = *s++; len--;
      if (len < 0)
        return(-1);
      str[tagindx]=(unsigned char) c;
    }
    str[taglen]=0;

    /* now finish up by formatting this binary data into ASCII equivalent */
    if (strlen((char *)readable) > 0)
      (void) FormatLocaleString(temp,MagickPathExtent,"%d#%d#%s=",
        (unsigned int) dataset,(unsigned int) recnum, readable);
    else
      (void) FormatLocaleString(temp,MagickPathExtent,"%d#%d=",
        (unsigned int) dataset,(unsigned int) recnum);
    (void) WriteBlobString(ofile,temp);
    formatString( ofile, (char *)str, taglen );
    str=(unsigned char *) RelinquishMagickMemory(str);

    tagsfound++;
  }
  return ((int) tagsfound);
}

Project: ImageMagick
File: meta.c

static ssize_t parse8BIM(Image *ifile, Image *ofile)
{
  char
    brkused,
    quoted,
    *line,
    *token,
    *newstr,
    *name;

  int
    state,
    next;

  unsigned char
    dataset;

  unsigned int
    recnum;

  int
    inputlen = MagickPathExtent;

  MagickOffsetType
    savedpos,
    currentpos;

  ssize_t
    savedolen = 0L,
    outputlen = 0L;

  TokenInfo
    *token_info;

  dataset = 0;
  recnum = 0;
  line = (char *) AcquireQuantumMemory((size_t) inputlen,sizeof(*line));
  if (line == (char *) NULL)
    return(-1);
  newstr = name = token = (char *) NULL;
  savedpos = 0;
  token_info=AcquireTokenInfo();
  while (super_fgets(&line,&inputlen,ifile)!=NULL)
  {
    state=0;
    next=0;

    token=(char *) AcquireQuantumMemory((size_t) inputlen,sizeof(*token));
    if (token == (char *) NULL)
      break;
    newstr=(char *) AcquireQuantumMemory((size_t) inputlen,sizeof(*newstr));
    if (newstr == (char *) NULL)
      break;
    while (Tokenizer(token_info,0,token,(size_t) inputlen,line,"","=","\"",0,
           &brkused,&next,&quoted)==0)
    {
      if (state == 0)
        {
          int
            state,
            next;

          char
            brkused,
            quoted;

          state=0;
          next=0;
          while (Tokenizer(token_info,0,newstr,(size_t) inputlen,token,"","#",
            "", 0,&brkused,&next,&quoted)==0)
          {
            switch (state)
            {
              case 0:
                if (strcmp(newstr,"8BIM")==0)
                  dataset = 255;
                else
                  dataset = (unsigned char) StringToLong(newstr);
                break;
              case 1:
                recnum = (unsigned int) StringToUnsignedLong(newstr);
                break;
              case 2:
                name=(char *) AcquireQuantumMemory(strlen(newstr)+MagickPathExtent,
                  sizeof(*name));
                if (name)
                  (void) strcpy(name,newstr);
                break;
            }
            state++;
          }
        }
      else
        if (state == 1)
          {
            int
              next;

            ssize_t
              len;

            char
              brkused,
              quoted;

            next=0;
            len = (ssize_t) strlen(token);
            while (Tokenizer(token_info,0,newstr,(size_t) inputlen,token,"","&",
              "",0,&brkused,&next,&quoted)==0)
            {
              if (brkused && next > 0)
                {
                  char
                    *s = &token[next-1];

                  len -= (ssize_t) convertHTMLcodes(s,(int) strlen(s));
                }
            }

            if (dataset == 255)
              {
                unsigned char
                  nlen = 0;

                int
                  i;

                if (savedolen > 0)
                  {
                    MagickOffsetType
                      offset;

                    ssize_t diff = outputlen - savedolen;
                    currentpos = TellBlob(ofile);
                    if (currentpos < 0)
                      return(-1);
                    offset=SeekBlob(ofile,savedpos,SEEK_SET);
                    if (offset < 0)
                      return(-1);
                    (void) WriteBlobMSBLong(ofile,(unsigned int) diff);
                    offset=SeekBlob(ofile,currentpos,SEEK_SET);
                    if (offset < 0)
                      return(-1);
                    savedolen = 0L;
                  }
                if (outputlen & 1)
                  {
                    (void) WriteBlobByte(ofile,0x00);
                    outputlen++;
                  }
                (void) WriteBlobString(ofile,"8BIM");
                (void) WriteBlobMSBShort(ofile,(unsigned short) recnum);
                outputlen += 6;
                if (name)
                  nlen = (unsigned char) strlen(name);
                (void) WriteBlobByte(ofile,nlen);
                outputlen++;
                for (i=0; i<nlen; i++)
                  (void) WriteBlobByte(ofile,(unsigned char) name[i]);
                outputlen += nlen;
                if ((nlen & 0x01) == 0)
                  {
                    (void) WriteBlobByte(ofile,0x00);
                    outputlen++;
                  }
                if (recnum != IPTC_ID)
                  {
                    (void) WriteBlobMSBLong(ofile, (unsigned int) len);
                    outputlen += 4;

                    next=0;
                    outputlen += len;
                    while (len-- > 0)
                      (void) WriteBlobByte(ofile,(unsigned char) token[next++]);

                    if (outputlen & 1)
                      {
                        (void) WriteBlobByte(ofile,0x00);
                        outputlen++;
                      }
                  }
                else
                  {
                    /* patch in a fake length for now and fix it later */
                    savedpos = TellBlob(ofile);
                    if (savedpos < 0)
                      return(-1);
                    (void) WriteBlobMSBLong(ofile,0xFFFFFFFFU);
                    outputlen += 4;
                    savedolen = outputlen;
                  }
              }
            else
              {
                if (len <= 0x7FFF)
                  {
                    (void) WriteBlobByte(ofile,0x1c);
                    (void) WriteBlobByte(ofile,(unsigned char) dataset);
                    (void) WriteBlobByte(ofile,(unsigned char) (recnum & 0xff));
                    (void) WriteBlobMSBShort(ofile,(unsigned short) len);
                    outputlen += 5;
                    next=0;
                    outputlen += len;
                    while (len-- > 0)
                      (void) WriteBlobByte(ofile,(unsigned char) token[next++]);
                  }
              }
          }
      state++;
    }
    if (token != (char *) NULL)
      token=DestroyString(token);
    if (newstr != (char *) NULL)
      newstr=DestroyString(newstr);
    if (name != (char *) NULL)
      name=DestroyString(name);
  }
  token_info=DestroyTokenInfo(token_info);
  if (token != (char *) NULL)
    token=DestroyString(token);
  if (newstr != (char *) NULL)
    newstr=DestroyString(newstr);
  if (name != (char *) NULL)
    name=DestroyString(name);
  line=DestroyString(line);
  if (savedolen > 0)
    {
      MagickOffsetType
        offset;

      ssize_t diff = outputlen - savedolen;

      currentpos = TellBlob(ofile);
      if (currentpos < 0)
        return(-1);
      offset=SeekBlob(ofile,savedpos,SEEK_SET);
      if (offset < 0)
        return(-1);
      (void) WriteBlobMSBLong(ofile,(unsigned int) diff);
      offset=SeekBlob(ofile,currentpos,SEEK_SET);
      if (offset < 0)
        return(-1);
      savedolen = 0L;
    }
  return outputlen;
}

Project: ImageMagick
File: meta.c

static Image *ReadMETAImage(const ImageInfo *image_info,
  ExceptionInfo *exception)
{
  Image
    *buff,
    *image;

  MagickBooleanType
    status;

  StringInfo
    *profile;

  size_t
    length;

  void
    *blob;

  /*
    Open file containing binary metadata
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickCoreSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickCoreSignature);
  image=AcquireImage(image_info,exception);
  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  image->columns=1;
  image->rows=1;
  if (SetImageBackgroundColor(image,exception) == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  length=1;
  if (LocaleNCompare(image_info->magick,"8BIM",4) == 0)
    {
      /*
        Read 8BIM binary metadata.
      */
      buff=AcquireImage((ImageInfo *) NULL,exception);
      if (buff == (Image *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      blob=(unsigned char *) AcquireQuantumMemory(length,sizeof(unsigned char));
      if (blob == (unsigned char *) NULL)
        {
          buff=DestroyImage(buff);
          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
        }
      AttachBlob(buff->blob,blob,length);
      if (LocaleCompare(image_info->magick,"8BIMTEXT") == 0)
        {
          length=(size_t) parse8BIM(image, buff);
          if (length & 1)
            (void) WriteBlobByte(buff,0x0);
        }
      else if (LocaleCompare(image_info->magick,"8BIMWTEXT") == 0)
        {
          length=(size_t) parse8BIMW(image, buff);
          if (length & 1)
            (void) WriteBlobByte(buff,0x0);
        }
      else
        CopyBlob(image,buff);
      profile=BlobToStringInfo(GetBlobStreamData(buff),(size_t)
        GetBlobSize(buff));
      if (profile == (StringInfo *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      status=SetImageProfile(image,"8bim",profile,exception);
      profile=DestroyStringInfo(profile);
      if (status == MagickFalse)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      blob=DetachBlob(buff->blob);
      blob=(unsigned char *) RelinquishMagickMemory(blob);
      buff=DestroyImage(buff);
    }
  if (LocaleNCompare(image_info->magick,"APP1",4) == 0)
    {
      char
        name[MagickPathExtent];

      (void) FormatLocaleString(name,MagickPathExtent,"APP%d",1);
      buff=AcquireImage((ImageInfo *) NULL,exception);
      if (buff == (Image *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      blob=(unsigned char *) AcquireQuantumMemory(length,sizeof(unsigned char));
      if (blob == (unsigned char *) NULL)
        {
          buff=DestroyImage(buff);
          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
        }
      AttachBlob(buff->blob,blob,length);
      if (LocaleCompare(image_info->magick,"APP1JPEG") == 0)
        {
          Image
            *iptc;

          int
            result;

          if (image_info->profile == (void *) NULL)
            {
              blob=DetachBlob(buff->blob);
              blob=RelinquishMagickMemory(blob);
              buff=DestroyImage(buff);
              ThrowReaderException(CoderError,"NoIPTCProfileAvailable");
            }
          profile=CloneStringInfo((StringInfo *) image_info->profile);
          iptc=AcquireImage((ImageInfo *) NULL,exception);
          if (iptc == (Image *) NULL)
            {
              blob=DetachBlob(buff->blob);
              blob=RelinquishMagickMemory(blob);
              buff=DestroyImage(buff);
              ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
            }
          AttachBlob(iptc->blob,GetStringInfoDatum(profile),
            GetStringInfoLength(profile));
          result=jpeg_embed(image,buff,iptc);
          blob=DetachBlob(iptc->blob);
          blob=RelinquishMagickMemory(blob);
          iptc=DestroyImage(iptc);
          if (result == 0)
            {
              blob=DetachBlob(buff->blob);
              blob=RelinquishMagickMemory(blob);
              buff=DestroyImage(buff);
              ThrowReaderException(CoderError,"JPEGEmbeddingFailed");
            }
        }
      else
        CopyBlob(image,buff);
      profile=BlobToStringInfo(GetBlobStreamData(buff),(size_t)
        GetBlobSize(buff));
      if (profile == (StringInfo *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      status=SetImageProfile(image,name,profile,exception);
      profile=DestroyStringInfo(profile);
      if (status == MagickFalse)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      blob=DetachBlob(buff->blob);
      blob=RelinquishMagickMemory(blob);
      buff=DestroyImage(buff);
    }
  if ((LocaleCompare(image_info->magick,"ICC") == 0) ||
      (LocaleCompare(image_info->magick,"ICM") == 0))
    {
      buff=AcquireImage((ImageInfo *) NULL,exception);
      if (buff == (Image *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      blob=(unsigned char *) AcquireQuantumMemory(length,sizeof(unsigned char));
      if (blob == (unsigned char *) NULL)
        {
          buff=DestroyImage(buff);
          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
        }
      AttachBlob(buff->blob,blob,length);
      CopyBlob(image,buff);
      profile=BlobToStringInfo(GetBlobStreamData(buff),(size_t)
        GetBlobSize(buff));
      if (profile == (StringInfo *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      (void) SetImageProfile(image,"icc",profile,exception);
      profile=DestroyStringInfo(profile);
      blob=DetachBlob(buff->blob);
      blob=(unsigned char *) RelinquishMagickMemory(blob);
      buff=DestroyImage(buff);
    }
  if (LocaleCompare(image_info->magick,"IPTC") == 0)
    {
      buff=AcquireImage((ImageInfo *) NULL,exception);
      if (buff == (Image *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      blob=(unsigned char *) AcquireQuantumMemory(length,sizeof(unsigned char));
      if (blob == (unsigned char *) NULL)
        {
          buff=DestroyImage(buff);
          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
        }
      AttachBlob(buff->blob,blob,length);
      CopyBlob(image,buff);
      profile=BlobToStringInfo(GetBlobStreamData(buff),(size_t)
        GetBlobSize(buff));
      if (profile == (StringInfo *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      (void) SetImageProfile(image,"8bim",profile,exception);
      profile=DestroyStringInfo(profile);
      blob=DetachBlob(buff->blob);
      blob=(unsigned char *) RelinquishMagickMemory(blob);
      buff=DestroyImage(buff);
    }
  if (LocaleCompare(image_info->magick,"XMP") == 0)
    {
      buff=AcquireImage((ImageInfo *) NULL,exception);
      if (buff == (Image *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      blob=(unsigned char *) AcquireQuantumMemory(length,sizeof(unsigned char));
      if (blob == (unsigned char *) NULL)
        {
          buff=DestroyImage(buff);
          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
        }
      AttachBlob(buff->blob,blob,length);
      CopyBlob(image,buff);
      profile=BlobToStringInfo(GetBlobStreamData(buff),(size_t)
        GetBlobSize(buff));
      if (profile == (StringInfo *) NULL)
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      (void) SetImageProfile(image,"xmp",profile,exception);
      profile=DestroyStringInfo(profile);
      blob=DetachBlob(buff->blob);
      blob=(unsigned char *) RelinquishMagickMemory(blob);
      buff=DestroyImage(buff);
    }
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}

Project: ImageMagick
File: meta.c

static int formatIPTC(Image *ifile, Image *ofile)
{
  char
    temp[MagickPathExtent];

  unsigned int
    foundiptc,
    tagsfound;

  unsigned char
    recnum,
    dataset;

  unsigned char
    *readable,
    *str;

  ssize_t
    tagindx,
    taglen;

  int
    i,
    tagcount = (int) (sizeof(tags) / sizeof(tag_spec));

  int
    c;

  foundiptc = 0; /* found the IPTC-Header */
  tagsfound = 0; /* number of tags found */

  c = ReadBlobByte(ifile);
  while (c != EOF)
  {
    if (c == 0x1c)
      foundiptc = 1;
    else
      {
        if (foundiptc)
          return(-1);
        else
          {
            c=0;
            continue;
          }
      }

    /* we found the 0x1c tag and now grab the dataset and record number tags */
    c = ReadBlobByte(ifile);
    if (c == EOF) return -1;
    dataset = (unsigned char) c;
    c = ReadBlobByte(ifile);
    if (c == EOF) return -1;
    recnum = (unsigned char) c;
    /* try to match this record to one of the ones in our named table */
    for (i=0; i< tagcount; i++)
    {
      if (tags[i].id == (short) recnum)
          break;
    }
    if (i < tagcount)
      readable = (unsigned char *) tags[i].name;
    else
      readable = (unsigned char *) "";
    /*
      We decode the length of the block that follows - ssize_t or short fmt.
    */
    c=ReadBlobByte(ifile);
    if (c == EOF) return -1;
    if (c & (unsigned char) 0x80)
      return 0;
    else
      {
        int
          c0;

        c0=ReadBlobByte(ifile);
        if (c0 == EOF) return -1;
        taglen = (c << 8) | c0;
      }
    if (taglen < 0) return -1;
    /* make a buffer to hold the tag datand snag it from the input stream */
    str=(unsigned char *) AcquireQuantumMemory((size_t) (taglen+MagickPathExtent),
      sizeof(*str));
    if (str == (unsigned char *) NULL)
      {
        printf("MemoryAllocationFailed");
        return 0;
      }
    for (tagindx=0; tagindx<taglen; tagindx++)
    {
      c=ReadBlobByte(ifile);
      if (c == EOF) return -1;
      str[tagindx] = (unsigned char) c;
    }
    str[taglen] = 0;

    /* now finish up by formatting this binary data into ASCII equivalent */
    if (strlen((char *)readable) > 0)
      (void) FormatLocaleString(temp,MagickPathExtent,"%d#%d#%s=",
        (unsigned int) dataset, (unsigned int) recnum, readable);
    else
      (void) FormatLocaleString(temp,MagickPathExtent,"%d#%d=",
        (unsigned int) dataset,(unsigned int) recnum);
    (void) WriteBlobString(ofile,temp);
    formatString( ofile, (char *)str, taglen );
    str=(unsigned char *) RelinquishMagickMemory(str);

    tagsfound++;

    c=ReadBlobByte(ifile);
  }
  return((int) tagsfound);
}