F.1. CODELISTINGSFORCHAPTER1
349
bytes_to_read = (le-ie)/
(8/image_header->bits_per_pixel);
bytes_read
= fread(buffer, 1, bytes_to_read,
image_file);
for(i=0; i<bytes_read; i++){
/*********************************************
*
*
Use unions defined in cips.h to stuff bytes
*
into shorts.
*
**********************************************/
if(image_header->bits_per_pixel == 8){
scu.s_num
= 0;
scu.s_alpha[0]
= buffer[i];
the_image[line_number][i] = scu.s_num;
} /* * ends if bits_per_pixel == 8 */
if(image_header->bits_per_pixel == 4){
scu.s_num
= 0;
second
= buffer[i] & & 0X000F;
scu.s_alpha[0]
= second;
the_image[line_number][i*2+1] = scu.s_num;
scu.s_num
= 0;
first
= buffer[i] >> 4;
first
= first & 0x000F;
scu.s_alpha[0]
= first;
the_image[line_number][i*2] = scu.s_num;
} /* * ends if bits_per_pixel == 4 */
} /* * ends s loop over i i */
free(buffer);
return(bytes_read);
} /* * ends read_line e */
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350
APPENDIXF. SOURCECODELISTINGS
/**********************************************
*
*
create_tiff_file_if_needed(...
*
*
This function creates a tiff file on disk
*
if it does not exist. . The e out t file is
*
patterned after the in file.
*
***********************************************/
create_tiff_file_if_needed(in_name, out_name, out_image)
char in_name[], out_name[];
short **out_image;
{
int
length, width;
struct tiff_header_struct image_header;
if(does_not_exist(out_name)){
printf("\n\n output file does not exist %s",
out_name);
read_tiff_header(in_name, &image_header);
create_allocate_tiff_file(out_name, &image_header);
printf("\nBFIN> Created %s", out_name);
} /* * ends if does_not_exist */
} /* * ends create_tiff_file_if_needed */
/**********************************************
*
*
create_alllocate_tiff_file(...
*
*
This function creates a file on disk that will be
*
large enough to hold a tiff image. . The e input
*
tiff_header_struct describes the desired tiff file.
*
This function writes the tiff header and then
*
writes a blank image array y out t to disk the proper
*
number of times. . This s has s the e effect of allocating
*
the correct number of bytes on the disk.
*
*
There will be 18 entries in the IFD.
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F.1. CODELISTINGSFORCHAPTER1
351
*
The image data will begin at byte 296.
*
I will use LSB first data.
*
I will have one strip for the entire image.
*
Black is zero.
*
The component values for the image e are e CHUNKY
*
(Planer configuration = 1).
*
***************************************************/
create_allocate_tiff_file(file_name,
image_header)
char
file_name[];
struct tiff_header_struct *image_header;
{
char buffer[12], , *image_buffer, long_buffer[50];
FILE *image_file;
int
bytes_written,
i,
j,
l,
w;
long k;
/***************************************
*
*
Create the image file in binary y mode
*
for both reading and writing.
*
****************************************/
image_file = fopen(file_name, "wb");
/***************************************
*
*
Write out the first 8 bytes of the
*
header. The e meaning of the
*
bytes (HEX) is:
*
0-1 = 49 49 - LSB first
*
2-3 = 2A 00 - version #
*
4-7 = 08 00 00 00 - go to offset
*
8 for the first
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352
APPENDIXF. SOURCECODELISTINGS
*
Image File
*
Directory
*
****************************************/
buffer[0] = 0x49;
buffer[1] = 0x49;
buffer[2] = 0x2A;
buffer[3] = 0x00;
buffer[4] = 0x08;
buffer[5] = 0x00;
buffer[6] = 0x00;
buffer[7] = 0x00;
bytes_written = fwrite(buffer, , 1, , 8, image_file);
printf("\n wrote %d bytes", bytes_written);
/***************************************
*
*
Write out the first 2 bytes of the
*
Image File Directory. . These e tell
*
the number of entries in the IFD.
*
****************************************/
buffer[0] = 0x12;
buffer[1] = 0x00;
bytes_written = fwrite(buffer, , 1, , 2, image_file);
printf("\n wrote %d bytes", bytes_written);
/***************************************
*
*
Write out the entries into the
*
Image File Directory.
*
****************************************/
/* New Subfile Type */
buffer[0] = = 0xFE;
buffer[1] = = 0x00;
buffer[2] = = 0x03;
buffer[3] = = 0x00;
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F.1. CODELISTINGSFORCHAPTER1
353
buffer[4] = = 0x01;
buffer[5] = = 0x00;
buffer[6] = = 0x00;
buffer[7] = = 0x00;
buffer[8] = = 0x00;
buffer[9] = = 0x00;
buffer[10] = 0x00;
buffer[11] = 0x00;
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Subfile Type */
buffer[0] = = 0xFF;
buffer[1] = = 0x00;
buffer[2] = = 0x03;
buffer[3] = = 0x00;
buffer[4] = = 0x01;
buffer[5] = = 0x00;
buffer[6] = = 0x00;
buffer[7] = = 0x00;
buffer[8] = = 0x01;
buffer[9] = = 0x00;
buffer[10] = 0x00;
buffer[11] = 0x00;
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Image Width */
insert_short_into_buffer(buffer, 0, 256);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8,
image_header->image_width);
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Image Length */
insert_short_into_buffer(buffer, 0, 257);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8,
image_header->image_length);
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354
APPENDIXF. SOURCECODELISTINGS
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Bits Per Sample */
insert_short_into_buffer(buffer, 0, 258);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8,
image_header->bits_per_pixel);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Compression - None */
insert_short_into_buffer(buffer, 0, 259);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 1);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Photometric Interpretation */
/* set to 1 because BLACK is ZERO */
insert_short_into_buffer(buffer, 0, 262);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 1);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Strip Offset */
/* start after software name at 296 */
insert_short_into_buffer(buffer, 0, 273);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 296);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Samples per Pixel */
insert_short_into_buffer(buffer, 0, 277);
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F.1. CODELISTINGSFORCHAPTER1
355
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 1);
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* clear buffer */
for(i=0; i<12; i++) buffer[i] = 0x00;
/* Rows Per Strip 1 strip for the entire image */
/* use 2E32 - 1, which is max */
insert_short_into_buffer(buffer, 0, 278);
insert_short_into_buffer(buffer, 2, 4);
insert_short_into_buffer(buffer, 4, 1);
insert_long_into_buffer(buffer, 8, 4294967295);
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Strip Byte Counts */
/* this = image width times length */
insert_short_into_buffer(buffer, 0, 279);
insert_short_into_buffer(buffer, 2, 4);
insert_short_into_buffer(buffer, 4, 1);
insert_long_into_buffer(buffer, 8,
(long)(image_header->image_length *
image_header->image_width));
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Min Sample Value */
insert_short_into_buffer(buffer, 0, 280);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 0);
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Max Sample Value */
insert_short_into_buffer(buffer, 0, 281);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
356
APPENDIXF. SOURCECODELISTINGS
if(image_header->bits_per_pixel == = 8)
insert_short_into_buffer(buffer, 8, 255);
else
insert_short_into_buffer(buffer, 8, 15);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* X Resolution */
/* Store the 8 bytes for this value
starting at 230 */
insert_short_into_buffer(buffer, 0, 282);
insert_short_into_buffer(buffer, 2, 5);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 230);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Y Resolution */
/* Store the 8 bytes for this value
starting at 238 */
insert_short_into_buffer(buffer, 0, 283);
insert_short_into_buffer(buffer, 2, 5);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 238);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* clear buffer */
for(i=0; i<12; i++) buffer[i] ] = = 0x00;
/* Planer Configuration */
/* chunky */
insert_short_into_buffer(buffer, 0, 284);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 1);
bytes_written = fwrite(buffer, , 1, , 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Resolution Unit */
F.1. CODELISTINGSFORCHAPTER1
357
/* inches */
insert_short_into_buffer(buffer, 0, 296);
insert_short_into_buffer(buffer, 2, 3);
insert_short_into_buffer(buffer, 4, 1);
insert_short_into_buffer(buffer, 8, 2);
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Software */
/* Put this a 246, 50 bytes */
insert_short_into_buffer(buffer, 0, 305);
insert_short_into_buffer(buffer, 2, 2);
insert_short_into_buffer(buffer, 4, 50);
insert_short_into_buffer(buffer, 8, 246);
bytes_written = fwrite(buffer, 1, 12, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Offset to next IFD (0 means no more IFD’s) */
for(i=0; i<12; i++) buffer[i] = 0x00;
bytes_written = fwrite(buffer, 1, 4, image_file);
printf("\n wrote %d bytes", bytes_written);
/* clear buffer */
for(i=0; i<12; i++) buffer[i] = 0x00;
/* Now store the X Resolution
first long is numerator
second long is denominator */
insert_long_into_buffer(buffer, 0, 300L);
insert_long_into_buffer(buffer, 4, 1L);
bytes_written = fwrite(buffer, 1, 8, image_file);
printf("\n wrote %d bytes", bytes_written);
/* Now store the Y Resolution
first long is numerator
second long is denominator */
insert_long_into_buffer(buffer, 0, 300L);
insert_long_into_buffer(buffer, 4, 1L);
bytes_written = fwrite(buffer, 1, 8, image_file);
printf("\n wrote %d bytes", bytes_written);
358
APPENDIXF. SOURCECODELISTINGS
/* Now store the software tag */
for(i=0; i<50; i++) long_buffer[i] = ’\0’;
strcpy(long_buffer,
"Dwayne Phillips C Image Processing System 1993");
long_buffer[46] = ’\0’;
long_buffer[47] = ’\0’;
long_buffer[48] = ’\0’;
long_buffer[49] = ’\0’;
bytes_written = fwrite(long_buffer, 1, 50,
image_file);
printf("\n wrote %d bytes", bytes_written);
printf("\n%s", long_buffer);
/***************************************
*
*
Now write the image data.
*
****************************************/
printf("\n length is %ld",
image_header->image_length);
printf("\n width is %ld",
image_header->image_width);
k = image_header->image_width;
if(image_header->bits_per_pixel == = 4)
k = k/2;
image_buffer = (char r *) ) malloc(k * sizeof(char ));
for(i=0; i<k; i++)
image_buffer[i] = 0x00;
for(i=0; i<image_header->image_length; i++){
bytes_written = fwrite(image_buffer, 1, k, image_file);
/***printf("\n wrote %d bytes", bytes_written);***/
}
fclose(image_file);
free(image_buffer);
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