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/* Panorama_Tools - Generate, Edit and Convert Panoramic Images
Copyright (C) 1998,1999 - Helmut Dersch der@fh-furtwangen.de
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, 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 GNU Libtool; see the file COPYING. If not, a copy
can be downloaded from http://www.gnu.org/licenses/gpl.html, or
obtained by writing to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/*------------------------------------------------------------*/
// Functions to read and write ppm format
#include "filter.h"
#include "metadata.h"
#include "file.h"
static int readPPMFileHeader(file_spec src, Image * im);
// image is allocated, but not image data
int readPPM(Image * im, fullPath * sfile)
{
file_spec src;
size_t count;
if (myopen(sfile, read_bin, src))
{
PrintError("Error Opening Image File");
return -1;
}
if (readPPMFileHeader(src, im) != 0)
{
PrintError("Error Reading File Header");
myclose(src);
return -1;
}
im->bitsPerPixel = 24;
im->bytesPerLine = im->width * 3;
im->dataSize = im->bytesPerLine * im->height;
im->data =
(unsigned char **) mymalloc((size_t) (im->width * im->height * 4));
if (im->data == NULL)
{
PrintError("Not enough memory");
myclose(src);
return -1;
}
count = (size_t) (im->width * im->height * 3);
myread(src, count, *(im->data));
if (count != im->width * im->height * 3)
{
PrintError("Error Reading Image Data");
myclose(src);
return -1;
}
myclose(src);
ThreeToFourBPP(im);
return 0;
}
static int readPPMFileHeader(file_spec src, Image * im)
{
int i;
char smallBuf[32], c;
size_t count = 1;
/* read the file header (including height and width) */
im->height = -1;
while (im->height == -1)
{
myread(src, count, &c);
if (count != 1)
return 1;
switch (c)
{
case '#':
/* comment line -- skip it */
while (c != 0x0A && c != 0x0D && count == 1)
myread(src, count, &c);
break;
case ' ':
case '\012':
case '\t':
case '\015':
/* random whitespace... just ignore it. */
break;
case 'P':
/* magic number */
myread(src, count, &c);
if (c != '6')
{
PrintError("Bad magic number in input file");
return (-1);
}
/* there should be one whitespace character */
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
/* read width */
for (i = 0; isdigit(c) && (i + 1 < sizeof(smallBuf)); i++)
{
smallBuf[i] = c;
myread(src, count, &c);
if (count != 1)
return -1;
}
if (!isspace(c))
{
PrintError("Bad input file format");
return -1;
}
smallBuf[i] = 0;
im->width = atoi(smallBuf);
/* read height */
myread(src, count, &c);
if (count != 1)
return -1;
for (i = 0; isdigit(c) && (i + 1 < sizeof(smallBuf)); i++)
{
smallBuf[i] = c;
myread(src, count, &c);
if (count != 1)
return -1;
}
if (!isspace(c))
{
PrintError("Bad input file format");
return -1;
}
smallBuf[i] = 0;
im->height = atoi(smallBuf);
/* read numColors */
myread(src, count, &c);
if (count != 1)
return -1;
for (i = 0; isdigit(c) && (i + 1 < sizeof(smallBuf)); i++)
{
smallBuf[i] = c;
myread(src, count, &c);
if (count != 1)
return -1;
}
if (!isspace(c))
{
PrintError("Bad input file format");
return -1;
}
smallBuf[i] = 0;
if (atoi(smallBuf) != 255)
PrintError("Warning: Wrong Colordepth!");
break;
default:
PrintError("Bad input file format");
return (-1);
break;
}
}
/* the header has been taken care of. The rest of the file is just image data. */
return (0);
}
int writePPM(Image * im, fullPath * sfile)
{
char header[30];
size_t count;
file_spec fnum;
int y, cy, cpy;
unsigned char *data;
if (myopen(sfile, write_bin, fnum))
{
PrintError("Error Writing Image File");
return -1;
}
if (im->bitsPerPixel == 32)
FourToThreeBPP(im);
if (im->bytesPerLine != im->width * 3) // Eliminate Pad bytes
{
data = *(im->data);
for (y = 0; y < im->height; y++)
{
cy = im->height * im->bytesPerLine;
cpy = im->height * im->width * 3;
memcpy(data + cpy, data + cy, (size_t) (im->width * 3));
}
im->bytesPerLine = im->width * 3;
im->dataSize = im->height * im->bytesPerLine;
}
sprintf(header, "P6\n%d %d\n%ld\n", im->width,
im->height, 255L);
count = strlen(header);
mywrite(fnum, count, header);
if (count != strlen(header))
{
PrintError("Error writing file header");
return -1;
}
count = im->dataSize;
mywrite(fnum, count, *(im->data));
if (count != im->dataSize)
{
PrintError("Error writing image data");
return -1;
}
myclose(fnum);
return 0;
}
int panoPPMRead(Image * im, fullPath * sfile)
{
if (readPPM(im, sfile) == 0) {
return panoMetadataUpdateFromImage(im);
} else
return FALSE;
}