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DEFINITIONS
This source file includes following definitions.
- IsSFW
- SFWScan
- TranslateSFWMarker
- ReadSFWImage
- RegisterSFWImage
- UnregisterSFWImage
/*
% Copyright (C) 2003 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
% Copyright 1991-1999 E. I. du Pont de Nemours and Company
%
% This program is covered by multiple licenses, which are described in
% Copyright.txt. You should have received a copy of Copyright.txt with this
% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% SSSSS FFFFF W W %
% SS F W W %
% SSS FFF W W %
% SS F W W W %
% SSSSS F W W %
% %
% %
% Read/Write GraphicsMagick Image Format. %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/constitute.h"
#include "magick/magick.h"
#include "magick/tempfile.h"
#include "magick/transform.h"
#include "magick/utility.h"
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s S F W %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method IsSFW returns True if the image format type, identified by the
% magick string, is SFW.
%
% The format of the IsSFW method is:
%
% unsigned int IsSFW(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o status: Method IsSFW returns True if the image format type is SFW.
%
% o magick: This string is generally the first few bytes of an image file
% or blob.
%
% o length: Specifies the length of the magick string.
%
%
*/
static unsigned int IsSFW(const unsigned char *magick,const size_t length)
{
if (length < 5)
return(False);
if (LocaleNCompare((char *) magick,"SFW94",5) == 0)
return(True);
return(False);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d S F W I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadSFWImage reads a Seattle Film Works image file and returns it.
% It allocates the memory necessary for the new Image structure and returns a
% pointer to the new image.
%
% The format of the ReadSFWImage method is:
%
% Image *ReadSFWImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadSFWImage returns a pointer to the image after
% reading. A null image is returned if there is a memory shortage or
% if the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static unsigned char *SFWScan(const unsigned char *p,const unsigned char *q,
const unsigned char *target,const int length)
{
register long
i;
for ( ; p < q; p++)
{
if (*p != *target)
continue;
if (length == 1)
return((unsigned char *) p);
for (i=1; i < length; i++)
if (*(p+i) != *(target+i))
break;
if (i == length)
return((unsigned char *) p);
}
return((unsigned char *) NULL);
}
static void TranslateSFWMarker(unsigned char *marker)
{
switch (marker[1])
{
case 0xc8: marker[1]=0xd8; break; /* soi */
case 0xd0: marker[1]=0xe0; break; /* app */
case 0xcb: marker[1]=0xdb; break; /* dqt */
case 0xa0: marker[1]=0xc0; break; /* sof */
case 0xa4: marker[1]=0xc4; break; /* sof */
case 0xca: marker[1]=0xda; break; /* sos */
case 0xc9: marker[1]=0xd9; break; /* eoi */
default: break;
}
}
static Image *ReadSFWImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
static unsigned char
HuffmanTable[] =
{
0xFF, 0xC4, 0x01, 0xA2, 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04,
0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x10, 0x00, 0x02, 0x01,
0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00,
0x01, 0x7D, 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21,
0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32,
0x81, 0x91, 0xA1, 0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1,
0xF0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18,
0x19, 0x1A, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64,
0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77,
0x78, 0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A,
0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3,
0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5,
0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9,
0xDA, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0x11,
0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04,
0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11, 0x04,
0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13,
0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1, 0x09,
0x23, 0x33, 0x52, 0xF0, 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24,
0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26, 0x27, 0x28,
0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45,
0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x73,
0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85,
0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9,
0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2,
0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4,
0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6,
0xE7, 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
0xF9, 0xFA
};
FILE
*file;
Image
*flipped_image,
*image;
ImageInfo
*clone_info;
register unsigned char
*header,
*data;
size_t
count;
unsigned char
*buffer,
*offset;
unsigned int
status;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == False)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
/*
Read image into a buffer.
*/
buffer=MagickAllocateMemory(unsigned char *,(size_t) GetBlobSize(image));
if (buffer == (unsigned char *) NULL)
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
count=ReadBlob(image,(size_t) GetBlobSize(image),(char *) buffer);
if ((count == 0) || (LocaleNCompare((char *) buffer,"SFW",3) != 0))
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
CloseBlob(image);
DestroyImage(image);
/*
Find the start of the JFIF data
*/
header=SFWScan(buffer,buffer+GetBlobSize(image)-1,(unsigned char *)
"\377\310\377\320",4);
if (header == (unsigned char *) NULL)
{
MagickFreeMemory(buffer);
ThrowReaderException(CorruptImageError,ImproperImageHeader,image)
}
TranslateSFWMarker(header); /* translate soi and app tags */
TranslateSFWMarker(header+2);
(void) memcpy(header+6,"JFIF\0\001\0",7); /* JFIF magic */
/*
Translate remaining markers.
*/
offset=header+2;
offset+=(offset[2] << 8)+offset[3]+2;
for ( ; ; )
{
TranslateSFWMarker(offset);
if (offset[1] == 0xda)
break;
offset+=(offset[2] << 8)+offset[3]+2;
}
offset--;
data=SFWScan(offset,buffer+GetBlobSize(image)-1,
(unsigned char *) "\377\311",2);
if (data == (unsigned char *) NULL)
{
MagickFreeMemory(buffer);
ThrowReaderException(CorruptImageError,ImproperImageHeader,image)
}
TranslateSFWMarker(data++); /* translate eoi marker */
/*
Write JFIF file.
*/
clone_info=CloneImageInfo(image_info);
clone_info->blob=(void *) NULL;
clone_info->length=0;
file=AcquireTemporaryFileStream(clone_info->filename,BinaryFileIOMode);
if (file == (FILE *) NULL)
{
char
filename[MaxTextExtent];
(void) strcpy(filename,clone_info->filename);
MagickFreeMemory(buffer);
DestroyImageInfo(clone_info);
ThrowReaderTemporaryFileException(filename)
}
(void) fwrite(header,(size_t) (offset-header+1),1,file);
(void) fwrite(HuffmanTable,1,sizeof(HuffmanTable)/sizeof(*HuffmanTable),file);
(void) fwrite(offset+1,(size_t) (data-offset),1,file);
status=ferror(file);
(void) fclose(file);
MagickFreeMemory(buffer);
if (status)
{
(void) LiberateTemporaryFile(clone_info->filename);
DestroyImageInfo(clone_info);
ThrowReaderException(FileOpenError,UnableToWriteFile,image)
}
/*
Read JPEG image.
*/
image=ReadImage(clone_info,exception);
(void) LiberateTemporaryFile(clone_info->filename);
DestroyImageInfo(clone_info);
if (image == (Image *) NULL)
return(image);
/*
Correct image orientation.
*/
flipped_image=FlipImage(image,exception);
if (flipped_image == (Image *) NULL)
return(image);
DestroyImage(image);
return(flipped_image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r S F W I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterSFWImage adds attributes for the SFW image format to
% the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterSFWImage method is:
%
% RegisterSFWImage(void)
%
*/
ModuleExport void RegisterSFWImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("SFW");
entry->decoder=(DecoderHandler) ReadSFWImage;
entry->magick=(MagickHandler) IsSFW;
entry->adjoin=False;
entry->description="Seattle Film Works";
entry->module="SFW";
entry->coder_class=UnstableCoderClass;
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r S F W I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterSFWImage removes format registrations made by the
% SFW module from the list of supported formats.
%
% The format of the UnregisterSFWImage method is:
%
% UnregisterSFWImage(void)
%
*/
ModuleExport void UnregisterSFWImage(void)
{
(void) UnregisterMagickInfo("SFW");
}