--- /dev/null
+/* atlc - arbitrary transmission line calculator, for the analysis of
+transmission lines are directional couplers.
+
+Copyright (C) 2002. Dr. David Kirkby, PhD (G8WRB).
+
+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 package_version 2
+of the License, or (at your option) any later package_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.
+
+Dr. David Kirkby, e-mail drkirkby at gmail.com
+
+*/
+
+#include "config.h"
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#include "definitions.h"
+#include "exit_codes.h"
+
+unsigned char *bmp_buff;
+
+/* We make the bitmap header public, as we write it back
+later, when saving bmp files. It saves a lot of hassle,
+just writing what we read back, rather than correctly
+calculating all the data in the header correctly */
+
+#define BITMAP_HEADER_SIZE 0x36 /* 54 */
+
+void read_bitmap_file_headers(char *filename, int *offset, size_t *size, int *width, int *height)
+{
+ FILE *fp;
+
+ struct Bitmap_File_Head_Struct Bitmap_File_Head;
+ struct Bitmap_Head_Struct Bitmap_Head;
+ int ColormapSize, Maps;
+ int length_of_file; /* Appently Photoshop versions < 7.01
+ don't write this into Bitmap_Head.biSizeIm
+ so it causes a problem. So we will work out
+ the length by seeking to the end of the file
+ and finding the position of the file
+ pointer */
+
+ bmp_buff=ustring(0,BITMAP_HEADER_SIZE);
+ if(strcmp(filename,"-")==0)
+ {
+ fp=stdin;
+ }
+ else
+ fp=fopen(filename,"rb");
+
+ if(fp==NULL)
+ {
+ fprintf(stderr,"cannot open %s\n", filename);
+ exit_with_msg_and_exit_code("",CANT_OPEN_FILE_FOR_READING);
+ }
+
+ /* deternine the length of the file, as its not always
+ written into the bitmap. I thought it needed to be, but
+ apparently it does not and photoshop versions < 7.01
+ don't do it. */
+ if( fseek(fp, 0, SEEK_END) == -1)
+ {
+ fprintf(stderr," Can't seek to the end of the file in read_bitmap_file_headers.c\n");
+ exit(FSEEK_FAILURE);
+ }
+ if( (length_of_file=ftell(fp)) == -1)
+ exit_with_msg_and_exit_code("Can't find length of file in read_bitmap_file_headers.c",FTELL_FAILURE);
+
+ if( (fseek(fp, 0, SEEK_SET) ) == -1)
+ {
+ fprintf(stderr," Can't seek to the beggining of the file in read_bitmap_file_headers.c\n");
+ exit(FSEEK_FAILURE);
+ }
+ /* Read the .bmp file header into a bmp_buff */
+ if (!(fread(bmp_buff, 1,BITMAP_HEADER_SIZE,fp))||(strncmp((char *) bmp_buff,"BM",2)))
+ {
+ fprintf(stderr,"%s is not a valid BMP file\n", filename);
+ exit_with_msg_and_exit_code("",NOT_A_VALID_BITMAP_FILE);
+ }
+
+/* On most machines, sizeof(short)==2 and sizeof(int)==4. This is so no matter
+if the machine is 32 or 64 bis. An exception is the Cray Y-MP, which has
+sizeof(short)=8
+sizeof(int)=8
+sizeof(long)=8.
+
+In this case, it is much more difficult to write the header for the bitmap. But in
+the aid of portability, this is done. So these is a section of code that will work
+even if sizeof(short)=8 and sizeof(int)=8. See below for that. */
+
+
+ /* Read the bmp_buff into the two structures we want */
+
+ Bitmap_File_Head.zzMagic[0x0] = bmp_buff[0];
+ Bitmap_File_Head.zzMagic[0x1] = bmp_buff[1];
+ Bitmap_File_Head.bfSize = bmp_buff[0x2] + ((bmp_buff[3] + ((bmp_buff[4] + (bmp_buff[5] << 8)) << 8)) <<8);
+ Bitmap_File_Head.zzHotX = bmp_buff[0x6] + (bmp_buff[7] << 8);
+ Bitmap_File_Head.zzHotY = bmp_buff[0x8] + (bmp_buff[0x09] << 8);
+ Bitmap_File_Head.bfOffs = bmp_buff[0x0a] + ((bmp_buff[0xb] + ((bmp_buff[0xc] + (bmp_buff[0x0d] << 8)) << 8)) <<8);
+ Bitmap_File_Head.biSize = bmp_buff[0x0E] + ((bmp_buff[0x0f] + ((bmp_buff[0x10] + (bmp_buff[0x11] << 8)) << 8)) <<8);
+ Bitmap_Head.biWidth=bmp_buff[0x12] + ((bmp_buff[0x13] + ((bmp_buff[0x14] + (bmp_buff[0x15] << 8)) << 8)) <<8);
+ Bitmap_Head.biHeight=bmp_buff[0x16] + ((bmp_buff[0x17] + ((bmp_buff[0x18] + (bmp_buff[0x19] << 8)) << 8)) <<8);
+ Bitmap_Head.biPlanes = bmp_buff[0x1A] + (bmp_buff[0x1b] << 8);
+ Bitmap_Head.biBitCnt = bmp_buff[0x1C] + (bmp_buff[0x1d] << 8);
+ Bitmap_Head.biCompr= bmp_buff[0x1E] + ((bmp_buff[0x1f] + ((bmp_buff[0x20] + (bmp_buff[0x21] << 8)) << 8)) <<8);
+ Bitmap_Head.biSizeIm=bmp_buff[0x22] + ((bmp_buff[0x23] + ((bmp_buff[0x24] + (bmp_buff[0x25] << 8)) << 8)) <<8);
+ /* I thought the length of the image was always stored in Bitmap_Head.biSizeIm, but
+ this appears not to be so. Hence it is now calculated from the length of the file
+ */
+ Bitmap_Head.biSizeIm=length_of_file-BITMAP_HEADER_SIZE;
+ Bitmap_Head.biXPels = bmp_buff[0x26] + ((bmp_buff[0x27] + ((bmp_buff[0x28] + (bmp_buff[0x29] << 8)) << 8)) <<8);
+ Bitmap_Head.biYPels= bmp_buff[0x2A] + ((bmp_buff[0x2b] + ((bmp_buff[0x2c] + (bmp_buff[0x2d] << 8)) << 8)) <<8);
+ Bitmap_Head.biClrUsed = bmp_buff[0x2E] + ((bmp_buff[0x2f] + ((bmp_buff[0x30] + (bmp_buff[0x31] << 8)) << 8)) <<8);
+ Bitmap_Head.biClrImp = bmp_buff[0x32] + ((bmp_buff[0x33] + ((bmp_buff[0x34] + (bmp_buff[0x35] << 8)) << 8)) <<8);
+
+ Maps=4;
+ if(Bitmap_Head.biBitCnt!=24)
+ {
+ fprintf(stderr,"Sorry, the .bmp bitmap must have 24 bits per colour,\n");
+ fprintf(stderr,"but it has %d bits. Resave the \n",Bitmap_Head.biBitCnt);
+ fprintf(stderr,"image using 24-bit colour\n");
+ exit_with_msg_and_exit_code("mage using 24-bit colour",BITMAP_NOT_24_BIT);
+ }
+ ColormapSize = (Bitmap_File_Head.bfOffs - Bitmap_File_Head.biSize - 14) / Maps;
+
+ if ((Bitmap_Head.biClrUsed == 0) && (Bitmap_Head.biBitCnt <= 8))
+ Bitmap_Head.biClrUsed = ColormapSize;
+
+ /* Sanity checks */
+
+ if (Bitmap_Head.biHeight == 0 || Bitmap_Head.biWidth == 0)
+ {
+ fprintf(stderr,"error reading BMP file header of %s - width or height is zero\n",filename);
+ exit_with_msg_and_exit_code("",WIDTH_OR_HEIGHT_ZERO_IN_BITMAP);
+ }
+ if (Bitmap_Head.biPlanes != 1)
+ {
+ fprintf(stderr,"error reading BMP file header of %s - bitplanes not equal to 1\n",filename);
+ exit_with_msg_and_exit_code("",BITPLANES_NOT_1_IN_BITMAP);
+ }
+ if (ColormapSize > 256 || Bitmap_Head.biClrUsed > 256)
+ {
+ fprintf(stderr,"error reading BMP file header of %s - colourmap size error\n",filename);
+ exit_with_msg_and_exit_code("",COLOURMAP_GREATER_THAN_256);
+ }
+ /* Windows and OS/2 declare filler so that rows are a multiple of
+ word length (32 bits == 4 bytes)
+ */
+
+ fclose(fp);
+ *width=Bitmap_Head.biWidth;
+ *height=Bitmap_Head.biHeight;
+ *offset=Bitmap_File_Head.bfOffs;
+ *size=Bitmap_Head.biSizeIm;
+ if( *size < 3 * (*width) * (*height) )
+ {
+ fprintf(stderr,"Internal error in read_bitmap_file_headers.c\n");
+ exit(1);
+ }
+}
projects / debian / atlc / blobdiff