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gimp/plug-ins/sgi/sgilib.c

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/*
* SGI image file format library routines.
*
* Copyright 1997-1998 Michael Sweet (mike@easysw.com)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Contents:
*
* sgiClose() - Close an SGI image file.
* sgiGetRow() - Get a row of image data from a file.
* sgiOpen() - Open an SGI image file for reading or writing.
* sgiOpenFile() - Open an SGI image file for reading or writing.
* sgiPutRow() - Put a row of image data to a file.
* getlong() - Get a 32-bit big-endian integer.
* getshort() - Get a 16-bit big-endian integer.
* putlong() - Put a 32-bit big-endian integer.
* putshort() - Put a 16-bit big-endian integer.
* read_rle8() - Read 8-bit RLE data.
* read_rle16() - Read 16-bit RLE data.
* write_rle8() - Write 8-bit RLE data.
* write_rle16() - Write 16-bit RLE data.
*
* Revision History:
*
* $Log$
* Revision 1.9 2005/03/04 13:23:31 neo
* 2005-03-04 Sven Neumann <sven@gimp.org>
*
* * plug-ins/FractalExplorer
* * plug-ins/Lighting
* * plug-ins/bmp
* * plug-ins/dbbrowser
* * plug-ins/faxg3
* * plug-ins/fits
* * plug-ins/flame
* * plug-ins/gfig
* * plug-ins/gflare
* * plug-ins/gfli
* * plug-ins/gimpressionist
* * plug-ins/ifscompose
* * plug-ins/jpeg
* * plug-ins/maze
* * plug-ins/pagecurl
* * plug-ins/print
* * plug-ins/rcm
* * plug-ins/script-fu
* * plug-ins/sel2path
* * plug-ins/sgi
* * plug-ins/twain
* * plug-ins/winicon
* * plug-ins/xjt: ported to gstdio, removed unnecessary includes,
* minor fixes to filename handling here and there.
*
* Revision 1.8 2003/04/07 11:59:33 neo
* 2003-04-07 Sven Neumann <sven@gimp.org>
*
* * plug-ins/sgi/sgi.h
* * plug-ins/sgi/sgilib.c: applied a patch from marek@aki.cz that
* adds support for reading SGI files in little-endian format. Fixes
* bug #106610.
*
* Revision 1.7 1998/06/06 23:22:21 yosh
* * adding Lighting plugin
*
* * updated despeckle, png, sgi, and sharpen
*
* -Yosh
*
* Revision 1.5 1998/04/23 17:40:49 mike
* Updated to support 16-bit <unsigned> image data.
*
* Revision 1.4 1998/02/05 17:10:58 mike
* Added sgiOpenFile() function for opening an existing file pointer.
*
* Revision 1.3 1997/07/02 16:40:16 mike
* sgiOpen() wasn't opening files with "rb" or "wb+". This caused problems
* on PCs running Windows/DOS...
*
* Revision 1.2 1997/06/18 00:55:28 mike
* Updated to hold length table when writing.
* Updated to hold current length when doing ARLE.
* Wasn't writing length table on close.
* Wasn't saving new line into arle_row when necessary.
*
* Revision 1.1 1997/06/15 03:37:19 mike
* Initial revision
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <glib/gstdio.h>
#include "sgi.h"
/*
* Local functions...
*/
static int getlong(sgi_t*);
static int getshort(sgi_t*);
static int putlong(long, sgi_t*);
static int putshort(unsigned short, sgi_t*);
static int read_rle8(sgi_t*, unsigned short *, int);
static int read_rle16(sgi_t*, unsigned short *, int);
static int write_rle8(sgi_t*, unsigned short *, int);
static int write_rle16(sgi_t*, unsigned short *, int);
/*
* 'sgiClose()' - Close an SGI image file.
*/
int
sgiClose(sgi_t *sgip) /* I - SGI image */
{
int i; /* Return status */
long *offset; /* Looping var for offset table */
if (sgip == NULL)
return (-1);
if (sgip->mode == SGI_WRITE && sgip->comp != SGI_COMP_NONE)
{
/*
* Write the scanline offset table to the file...
*/
fseek(sgip->file, 512, SEEK_SET);
for (i = sgip->ysize * sgip->zsize, offset = sgip->table[0];
i > 0;
i --, offset ++)
if (putlong(offset[0], sgip) < 0)
return (-1);
for (i = sgip->ysize * sgip->zsize, offset = sgip->length[0];
i > 0;
i --, offset ++)
if (putlong(offset[0], sgip) < 0)
return (-1);
};
if (sgip->table != NULL)
{
free(sgip->table[0]);
free(sgip->table);
};
if (sgip->length != NULL)
{
free(sgip->length[0]);
free(sgip->length);
};
if (sgip->comp == SGI_COMP_ARLE)
free(sgip->arle_row);
i = fclose(sgip->file);
free(sgip);
return (i);
}
/*
* 'sgiGetRow()' - Get a row of image data from a file.
*/
int
sgiGetRow(sgi_t *sgip, /* I - SGI image */
unsigned short *row, /* O - Row to read */
int y, /* I - Line to read */
int z) /* I - Channel to read */
{
int x; /* X coordinate */
long offset; /* File offset */
if (sgip == NULL ||
row == NULL ||
y < 0 || y >= sgip->ysize ||
z < 0 || z >= sgip->zsize)
return (-1);
switch (sgip->comp)
{
case SGI_COMP_NONE :
/*
* Seek to the image row - optimize buffering by only seeking if
* necessary...
*/
offset = 512 + (y + z * sgip->ysize) * sgip->xsize * sgip->bpp;
if (offset != ftell(sgip->file))
fseek(sgip->file, offset, SEEK_SET);
if (sgip->bpp == 1)
{
for (x = sgip->xsize; x > 0; x --, row ++)
*row = getc(sgip->file);
}
else
{
for (x = sgip->xsize; x > 0; x --, row ++)
*row = getshort(sgip);
};
break;
case SGI_COMP_RLE :
offset = sgip->table[z][y];
if (offset != ftell(sgip->file))
fseek(sgip->file, offset, SEEK_SET);
if (sgip->bpp == 1)
return (read_rle8(sgip, row, sgip->xsize));
else
return (read_rle16(sgip, row, sgip->xsize));
break;
};
return (0);
}
/*
* 'sgiOpen()' - Open an SGI image file for reading or writing.
*/
sgi_t *
sgiOpen(char *filename, /* I - File to open */
int mode, /* I - Open mode (SGI_READ or SGI_WRITE) */
int comp, /* I - Type of compression */
int bpp, /* I - Bytes per pixel */
int xsize, /* I - Width of image in pixels */
int ysize, /* I - Height of image in pixels */
int zsize) /* I - Number of channels */
{
sgi_t *sgip; /* New SGI image file */
FILE *file; /* Image file pointer */
if (mode == SGI_READ)
file = g_fopen(filename, "rb");
else
file = g_fopen(filename, "wb+");
if (file == NULL)
return (NULL);
if ((sgip = sgiOpenFile(file, mode, comp, bpp, xsize, ysize, zsize)) == NULL)
fclose(file);
return (sgip);
}
/*
* 'sgiOpenFile()' - Open an SGI image file for reading or writing.
*/
sgi_t *
sgiOpenFile(FILE *file, /* I - File to open */
int mode, /* I - Open mode (SGI_READ or SGI_WRITE) */
int comp, /* I - Type of compression */
int bpp, /* I - Bytes per pixel */
int xsize, /* I - Width of image in pixels */
int ysize, /* I - Height of image in pixels */
int zsize) /* I - Number of channels */
{
int i, j; /* Looping var */
char name[80]; /* Name of file in image header */
short magic; /* Magic number */
sgi_t *sgip; /* New image pointer */
if ((sgip = calloc(sizeof(sgi_t), 1)) == NULL)
return (NULL);
sgip->file = file;
sgip->swapBytes = 0;
switch (mode)
{
case SGI_READ :
sgip->mode = SGI_READ;
magic = getshort(sgip);
if (magic != SGI_MAGIC)
{
/* try little endian format */
magic = ((magic >> 8) & 0x00ff) | ((magic << 8) & 0xff00);
if(magic != SGI_MAGIC) {
free(sgip);
return (NULL);
} else {
sgip->swapBytes = 1;
}
}
sgip->comp = getc(sgip->file);
sgip->bpp = getc(sgip->file);
getshort(sgip); /* Dimensions */
sgip->xsize = getshort(sgip);
sgip->ysize = getshort(sgip);
sgip->zsize = getshort(sgip);
getlong(sgip); /* Minimum pixel */
getlong(sgip); /* Maximum pixel */
if (sgip->comp)
{
/*
* This file is compressed; read the scanline tables...
*/
fseek(sgip->file, 512, SEEK_SET);
sgip->table = calloc(sgip->zsize, sizeof(long *));
sgip->table[0] = calloc(sgip->ysize * sgip->zsize, sizeof(long));
for (i = 1; i < sgip->zsize; i ++)
sgip->table[i] = sgip->table[0] + i * sgip->ysize;
for (i = 0; i < sgip->zsize; i ++)
for (j = 0; j < sgip->ysize; j ++)
sgip->table[i][j] = getlong(sgip);
};
break;
case SGI_WRITE :
if (xsize < 1 ||
ysize < 1 ||
zsize < 1 ||
bpp < 1 || bpp > 2 ||
comp < SGI_COMP_NONE || comp > SGI_COMP_ARLE)
{
free(sgip);
return (NULL);
};
sgip->mode = SGI_WRITE;
putshort(SGI_MAGIC, sgip);
putc((sgip->comp = comp) != 0, sgip->file);
putc(sgip->bpp = bpp, sgip->file);
putshort(3, sgip); /* Dimensions */
putshort(sgip->xsize = xsize, sgip);
putshort(sgip->ysize = ysize, sgip);
putshort(sgip->zsize = zsize, sgip);
if (bpp == 1)
{
putlong(0, sgip); /* Minimum pixel */
putlong(255, sgip); /* Maximum pixel */
}
else
{
putlong(-32768, sgip); /* Minimum pixel */
putlong(32767, sgip); /* Maximum pixel */
};
putlong(0, sgip); /* Reserved */
memset(name, 0, sizeof(name));
fwrite(name, sizeof(name), 1, sgip->file);
for (i = 0; i < 102; i ++)
putlong(0, sgip);
switch (comp)
{
case SGI_COMP_NONE : /* No compression */
/*
* This file is uncompressed. To avoid problems with sparse files,
* we need to write blank pixels for the entire image...
*/
if (bpp == 1)
{
for (i = xsize * ysize * zsize; i > 0; i --)
putc(0, sgip->file);
}
else
{
for (i = xsize * ysize * zsize; i > 0; i --)
putshort(0, sgip);
};
break;
case SGI_COMP_ARLE : /* Aggressive RLE */
sgip->arle_row = (unsigned short *)calloc(xsize, sizeof(unsigned short));
sgip->arle_offset = 0;
case SGI_COMP_RLE : /* Run-Length Encoding */
/*
* This file is compressed; write the (blank) scanline tables...
*/
for (i = 2 * ysize * zsize; i > 0; i --)
putlong(0, sgip);
sgip->firstrow = ftell(sgip->file);
sgip->nextrow = ftell(sgip->file);
sgip->table = calloc(sgip->zsize, sizeof(long *));
sgip->table[0] = calloc(sgip->ysize * sgip->zsize, sizeof(long));
for (i = 1; i < sgip->zsize; i ++)
sgip->table[i] = sgip->table[0] + i * sgip->ysize;
sgip->length = calloc(sgip->zsize, sizeof(long *));
sgip->length[0] = calloc(sgip->ysize * sgip->zsize, sizeof(long));
for (i = 1; i < sgip->zsize; i ++)
sgip->length[i] = sgip->length[0] + i * sgip->ysize;
break;
};
break;
default :
free(sgip);
return (NULL);
};
return (sgip);
}
/*
* 'sgiPutRow()' - Put a row of image data to a file.
*/
int
sgiPutRow(sgi_t *sgip, /* I - SGI image */
unsigned short *row, /* I - Row to write */
int y, /* I - Line to write */
int z) /* I - Channel to write */
{
int x; /* X coordinate */
long offset; /* File offset */
if (sgip == NULL ||
row == NULL ||
y < 0 || y >= sgip->ysize ||
z < 0 || z >= sgip->zsize)
return (-1);
switch (sgip->comp)
{
case SGI_COMP_NONE :
/*
* Seek to the image row - optimize buffering by only seeking if
* necessary...
*/
offset = 512 + (y + z * sgip->ysize) * sgip->xsize * sgip->bpp;
if (offset != ftell(sgip->file))
fseek(sgip->file, offset, SEEK_SET);
if (sgip->bpp == 1)
{
for (x = sgip->xsize; x > 0; x --, row ++)
putc(*row, sgip->file);
}
else
{
for (x = sgip->xsize; x > 0; x --, row ++)
putshort(*row, sgip);
};
break;
case SGI_COMP_ARLE :
if (sgip->table[z][y] != 0)
return (-1);
/*
* First check the last row written...
*/
if (sgip->arle_offset > 0)
{
for (x = 0; x < sgip->xsize; x ++)
if (row[x] != sgip->arle_row[x])
break;
if (x == sgip->xsize)
{
sgip->table[z][y] = sgip->arle_offset;
sgip->length[z][y] = sgip->arle_length;
return (0);
};
};
/*
* If that didn't match, search all the previous rows...
*/
fseek(sgip->file, sgip->firstrow, SEEK_SET);
if (sgip->bpp == 1)
{
do
{
sgip->arle_offset = ftell(sgip->file);
if ((sgip->arle_length = read_rle8(sgip, sgip->arle_row, sgip->xsize)) < 0)
{
x = 0;
break;
};
for (x = 0; x < sgip->xsize; x ++)
if (row[x] != sgip->arle_row[x])
break;
}
while (x < sgip->xsize);
}
else
{
do
{
sgip->arle_offset = ftell(sgip->file);
if ((sgip->arle_length = read_rle16(sgip, sgip->arle_row, sgip->xsize)) < 0)
{
x = 0;
break;
};
for (x = 0; x < sgip->xsize; x ++)
if (row[x] != sgip->arle_row[x])
break;
}
while (x < sgip->xsize);
};
if (x == sgip->xsize)
{
sgip->table[z][y] = sgip->arle_offset;
sgip->length[z][y] = sgip->arle_length;
return (0);
}
else
fseek(sgip->file, 0, SEEK_END); /* Clear EOF */
case SGI_COMP_RLE :
if (sgip->table[z][y] != 0)
return (-1);
offset = sgip->table[z][y] = sgip->nextrow;
if (offset != ftell(sgip->file))
fseek(sgip->file, offset, SEEK_SET);
if (sgip->bpp == 1)
x = write_rle8(sgip, row, sgip->xsize);
else
x = write_rle16(sgip, row, sgip->xsize);
if (sgip->comp == SGI_COMP_ARLE)
{
sgip->arle_offset = offset;
sgip->arle_length = x;
memcpy(sgip->arle_row, row, sgip->xsize * sizeof(short));
};
sgip->nextrow = ftell(sgip->file);
sgip->length[z][y] = x;
return (x);
};
return (0);
}
/*
* 'getlong()' - Get a 32-bit big-endian integer.
*/
static int
getlong(sgi_t *sgip) /* I - SGI image to read from */
{
unsigned char b[4];
fread(b, 4, 1, sgip->file);
if(sgip->swapBytes)
return ((b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0]);
else
return ((b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3]);
}
/*
* 'getshort()' - Get a 16-bit big-endian integer.
*/
static int
getshort(sgi_t *sgip) /* I - SGI image to read from */
{
unsigned char b[2];
fread(b, 2, 1, sgip->file);
if(sgip->swapBytes)
return ((b[1] << 8) | b[0]);
else
return ((b[0] << 8) | b[1]);
}
/*
* 'putlong()' - Put a 32-bit big-endian integer.
*/
static int
putlong(long n, /* I - Long to write */
sgi_t *sgip) /* I - File to write to */
{
if (putc(n >> 24, sgip->file) == EOF)
return (EOF);
if (putc(n >> 16, sgip->file) == EOF)
return (EOF);
if (putc(n >> 8, sgip->file) == EOF)
return (EOF);
if (putc(n, sgip->file) == EOF)
return (EOF);
else
return (0);
}
/*
* 'putshort()' - Put a 16-bit big-endian integer.
*/
static int
putshort(unsigned short n, /* I - Short to write */
sgi_t *sgip) /* I - File to write to */
{
if (putc(n >> 8, sgip->file) == EOF)
return (EOF);
if (putc(n, sgip->file) == EOF)
return (EOF);
else
return (0);
}
/*
* 'read_rle8()' - Read 8-bit RLE data.
*/
static int
read_rle8(sgi_t *sgip, /* I - SGI image to read from */
unsigned short *row, /* O - Data */
int xsize) /* I - Width of data in pixels */
{
int i, /* Looping var */
ch, /* Current character */
count, /* RLE count */
length; /* Number of bytes read... */
length = 0;
while (xsize > 0)
{
if ((ch = getc(sgip->file)) == EOF)
return (-1);
length ++;
count = ch & 127;
if (count == 0)
break;
if (ch & 128)
{
for (i = 0; i < count; i ++, row ++, xsize --, length ++)
*row = getc(sgip->file);
}
else
{
ch = getc(sgip->file);
length ++;
for (i = 0; i < count; i ++, row ++, xsize --)
*row = ch;
};
};
return (xsize > 0 ? -1 : length);
}
/*
* 'read_rle16()' - Read 16-bit RLE data.
*/
static int
read_rle16(sgi_t *sgip, /* I - SGI image to read from */
unsigned short *row, /* O - Data */
int xsize)/* I - Width of data in pixels */
{
int i, /* Looping var */
ch, /* Current character */
count, /* RLE count */
length; /* Number of bytes read... */
length = 0;
while (xsize > 0)
{
if ((ch = getshort(sgip)) == EOF)
return (-1);
length ++;
count = ch & 127;
if (count == 0)
break;
if (ch & 128)
{
for (i = 0; i < count; i ++, row ++, xsize --, length ++)
*row = getshort(sgip);
}
else
{
ch = getshort(sgip);
length ++;
for (i = 0; i < count; i ++, row ++, xsize --)
*row = ch;
};
};
return (xsize > 0 ? -1 : length * 2);
}
/*
* 'write_rle8()' - Write 8-bit RLE data.
*/
static int
write_rle8(sgi_t *sgip, /* I - SGI image to write to */
unsigned short *row, /* I - Data */
int xsize)/* I - Width of data in pixels */
{
int length, /* Length of output line */
count, /* Number of repeated/non-repeated pixels */
i, /* Looping var */
x; /* Looping var */
unsigned short *start, /* Start of sequence */
repeat; /* Repeated pixel */
for (x = xsize, length = 0; x > 0;)
{
start = row;
row += 2;
x -= 2;
while (x > 0 && (row[-2] != row[-1] || row[-1] != row[0]))
{
row ++;
x --;
};
row -= 2;
x += 2;
count = row - start;
while (count > 0)
{
i = count > 126 ? 126 : count;
count -= i;
if (putc(128 | i, sgip->file) == EOF)
return (-1);
length ++;
while (i > 0)
{
if (putc(*start, sgip->file) == EOF)
return (-1);
start ++;
i --;
length ++;
};
};
if (x <= 0)
break;
start = row;
repeat = row[0];
row ++;
x --;
while (x > 0 && *row == repeat)
{
row ++;
x --;
};
count = row - start;
while (count > 0)
{
i = count > 126 ? 126 : count;
count -= i;
if (putc(i, sgip->file) == EOF)
return (-1);
length ++;
if (putc(repeat, sgip->file) == EOF)
return (-1);
length ++;
};
};
length ++;
if (putc(0, sgip->file) == EOF)
return (-1);
else
return (length);
}
/*
* 'write_rle16()' - Write 16-bit RLE data.
*/
static int
write_rle16(sgi_t *sgip, /* I - SGI image to write to */
unsigned short *row,/* I - Data */
int xsize)/* I - Width of data in pixels */
{
int length, /* Length of output line */
count, /* Number of repeated/non-repeated pixels */
i, /* Looping var */
x; /* Looping var */
unsigned short *start, /* Start of sequence */
repeat; /* Repeated pixel */
for (x = xsize, length = 0; x > 0;)
{
start = row;
row += 2;
x -= 2;
while (x > 0 && (row[-2] != row[-1] || row[-1] != row[0]))
{
row ++;
x --;
};
row -= 2;
x += 2;
count = row - start;
while (count > 0)
{
i = count > 126 ? 126 : count;
count -= i;
if (putshort(128 | i, sgip) == EOF)
return (-1);
length ++;
while (i > 0)
{
if (putshort(*start, sgip) == EOF)
return (-1);
start ++;
i --;
length ++;
};
};
if (x <= 0)
break;
start = row;
repeat = row[0];
row ++;
x --;
while (x > 0 && *row == repeat)
{
row ++;
x --;
};
count = row - start;
while (count > 0)
{
i = count > 126 ? 126 : count;
count -= i;
if (putshort(i, sgip) == EOF)
return (-1);
length ++;
if (putshort(repeat, sgip) == EOF)
return (-1);
length ++;
};
};
length ++;
if (putshort(0, sgip) == EOF)
return (-1);
else
return (2 * length);
}
/*
* End of "$Id$".
*/
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