how to view pdf file in asp.net using c# : Extract photos pdf SDK application service wpf windows asp.net dnn cips2ed75-part1077

F.17. CODE LISTINGS FOR CHAPTER 17
729
short *processed_pattern, *special_pixels;
long width;
{
int i, place;
for(i=0; i<width; i++){
place = processed_pattern[i] - PATTERN_START;
processed_pattern[i] =
special_pixels[place];
} /* ends loop over i */
} /* ends special_substitution */
Listing 16.4 - The spstereo Program
F.17 Code Listings for Chapter 17
/***********************************************
*
* file hidet.c
*
* Functions: This file contains
*
main
*
* Purpose:
*
This file contains the main calling
*
routine and subroutines to overlay
*
text on top of an image.
*
* External Calls:
*
imageio.c - create_image_file
*
read_image_array
*
write_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
* Modifications:
*
16 February 1998 - created
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730
APPENDIX F. SOURCE CODE LISTINGS
*
22 September 1998 - modified to work with
*
all I O routines in imageio.c.
*
*************************************************/
#include "cips.h"
main(argc, argv)
int argc;
char *argv[];
{
char image_name[80], water_name[80];
int
i, j;
long length, width;
short factor;
short **the_image;
short **out_image;
if(argc < 4){
printf("\n\nNot enough parameters:");
printf("\n");
printf("\n
usage: hidet image-file text-file factor ");
exit(0);
}
strcpy(image_name, argv[1]);
strcpy(water_name, argv[2]);
factor = atoi(argv[3]);
if(does_not_exist(image_name)){
printf("\nERROR input file %s does not exist",
image_name);
exit(0);
}
if(does_not_exist(water_name)){
printf("\nERROR input file %s does not exist",
water_name);
exit(0);
}
if(are_not_same_size(image_name, water_name)){
printf("\nERROR images are not same size");
exit(0);
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F.17. CODE LISTINGS FOR CHAPTER 17
731
}
get_image_size(image_name, &length, &width);
the_image = allocate_image_array(length, width);
out_image = allocate_image_array(length, width);
read_image_array(image_name, the_image);
read_image_array(water_name, out_image);
for(i=0; i<length; i++){
for(j=0; j<width; j++){
if(out_image[i][j] != 0){
the_image[i][j] = the_image[i][j] + factor;
if(the_image[i][j] > GRAY_LEVELS)
the_image[i][j] = GRAY_LEVELS;
} /* ends if */
} /* ends loop over j */
} /* ends loop over i */
write_image_array(image_name, the_image);
free_image_array(the_image, length);
free_image_array(out_image, length);
} /* ends main */
Listing 17.1 - Source Code to Hide a Watermark in an Image
/***********************************************
*
* file stega.c
*
* Functions: This file contains
*
main
*
hide_image
*
hide_pixels
*
uncover_image
*
uncover_pixels
*
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732
APPENDIX F. SOURCE CODE LISTINGS
* Purpose:
*
This file contains the main calling
*
routine and other routines that
*
use steganography to hide one image
*
inside another and then recover the
*
hidden image.
*
* External Calls:
*
imageio.c - create_image_file
*
read_image_array
*
write_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
* Modifications:
*
5 April 1998 - created
*
22 September 1998 - modified to work with
*
all I O routines in imageio.c.
*
*************************************************/
#include "cips.h"
#define EIGHT 8
main(argc, argv)
int argc;
char *argv[];
{
char cover_image_name[80],
message_image_name[80];
int
hide
= 0,
i,
j,
lsb,
n,
uncover = 0;
long clength,
mlength,
cwidth,
mwidth;
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F.17. CODE LISTINGS FOR CHAPTER 17
733
short **the_image;
short **out_image;
/******************************************
*
*
Ensure the command line is correct.
*
******************************************/
if(argc < 5){
stega_show_usage();
exit(0);
}
if(strcmp(argv[1], "-h") == 0){
hide
= 1;
uncover = 0;
}
if(strcmp(argv[1], "-u") == 0){
hide
= 0;
uncover = 1;
}
if( (hide
== 0)
&&
(uncover == 0) ){
printf("\nNiether hiding nor uncovering");
printf("\nSo, quitting");
exit(1);
} /* ends if */
strcpy(cover_image_name, argv[2]);
strcpy(message_image_name, argv[3]);
n = atoi(argv[4]);
/******************************************
*
* Hide the cover image in the message image.
*
******************************************/
if(hide){
if(does_not_exist(cover_image_name)){
printf("\n%s does not exist, quitting",
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734
APPENDIX F. SOURCE CODE LISTINGS
cover_image_name);
}
if(does_not_exist(message_image_name)){
printf("\n%s does not exist, quitting",
message_image_name);
}
/******************************************
*
*
Ensure both images have the same height
*
and the cover image is eight times as
*
wide as the message image.
*
Also determine if the bit order is lsb
*
first or not.
*
******************************************/
get_image_size(cover_image_name,
&clength, &cwidth);
get_image_size(message_image_name,
&mlength, &mwidth);
if(mlength != clength){
printf("\n\nmlength NOT EQUAL TO clength");
printf("\nQUITING");
exit(2);
} /* ends if length not equal */
if(cwidth != (n*mwidth)){
printf("\nCover image not wide enough");
printf("\nQUITING");
exit(3);
} /* ends if cover image not wide enough */
lsb = get_lsb(cover_image_name);
/******************************************
*
*
Allocate the two image arrays.
*
Read the cover and message images and
*
hide the message image.
*
******************************************/
the_image = allocate_image_array(
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F.17. CODE LISTINGS FOR CHAPTER 17
735
clength, cwidth);
out_image = allocate_image_array(
mlength, mwidth);
read_image_array(cover_image_name, the_image);
read_image_array(message_image_name, out_image);
hide_image(the_image, out_image,
mlength, mwidth,
clength, cwidth,
lsb, n);
write_image_array(cover_image_name, the_image);
} /* ends if hide */
/******************************************
*
*
Uncover the cover image from the
*
message image.
*
******************************************/
if(uncover){
printf("\nMAIN> Uncover");
if(does_not_exist(cover_image_name)){
printf("\n%s does not exist, quitting",
cover_image_name);
} /* ends if does_not_exist */
/******************************************
*
*
Create the message image to be the
*
correct size.
*
******************************************/
get_image_size(cover_image_name,
&clength, &cwidth);
mlength = clength;
mwidth = cwidth/n;
create_resized_image_file(cover_image_name,
message_image_name,
mlength, mwidth);
lsb = get_lsb(cover_image_name);
736
APPENDIX F. SOURCE CODE LISTINGS
/******************************************
*
*
Allocate the two image arrays.
*
Read the cover image and uncover
*
the message image.
*
******************************************/
the_image = allocate_image_array(
clength, cwidth);
out_image = allocate_image_array(
mlength, mwidth);
read_image_array(cover_image_name, the_image);
uncover_image(the_image, out_image,
mlength, mwidth,
clength, cwidth,
lsb, n);
write_image_array(message_image_name, out_image);
} /* ends if uncover */
free_image_array(the_image, clength);
free_image_array(out_image, mlength);
} /* ends main */
/*********************************************
*
*
hide_image(...
*
*
This routine hides the message image in
*
the cover image. Loop through the pixels
*
in the message image and call hide_pixels
*
for every pixel in the message image.
*
*********************************************/
int hide_image(cover_image,
message_image,
mlength,
F.17. CODE LISTINGS FOR CHAPTER 17
737
mwidth,
clength,
cwidth,
lsb,
n)
int
lsb, n;
long clength, cwidth, mlength, mwidth;
short **cover_image,
**message_image;
{
char response[80];
int h_counter
= 0;
for(h_counter=0; h_counter<mwidth; h_counter++){
hide_pixels(cover_image,
message_image,
h_counter,
h_counter*n,
lsb,
n,
mlength);
} /* ends loop over h_counter */
} /* ends hide_image */
/*********************************************
*
*
hide_pixels(..
*
*
This routine hides the bits in a pixel
*
from the message image into the least
*
significant bit of eight pixels in the
*
cover image.
*
*
Do this one operation for every row of
*
pixels in the message and cover images.
*
*********************************************/
int hide_pixels(cover_image,
message_image,
738
APPENDIX F. SOURCE CODE LISTINGS
mie,
cie,
lsb,
n,
mlength)
int
cie, lsb, mie, n;
long mlength;
short **cover_image,
**message_image;
{
char result,
new_message,
sample;
char mask1[EIGHT] = {0x01, /* 0000 0001 */
0x02, /* 0000 0010 */
0x04, /* 0000 0100 */
0x08, /* 0000 1000 */
0x10, /* 0001 0000 */
0x20, /* 0010 0000 */
0x40, /* 0100 0000 */
0x80}; /* 1000 0000 */
char mask2[EIGHT] = {0xFE, /* 1111 1110 */
0xFD, /* 1111 1101 */
0xFB, /* 1111 1011 */
0xF7, /* 1111 0111 */
0xEF, /* 1110 1111 */
0xDF, /* 1101 1111 */
0xBF, /* 1011 1111 */
0x7F}; /* 0111 1111 */
int c_counter,
i, j;
printf("\nHP> mie=%d
cie=%d
lsb=%d", mie, cie, lsb);
for(i=0; i<mlength; i++){
c_counter = 0;
sample
= message_image[i][mie];
for(j=n-1; j>-1; j--){
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