how to view pdf file in asp.net using c# : How to extract text from pdf image file control software system azure winforms asp.net console cips2ed39-part1037

F.1. CODE LISTINGS FOR CHAPTER 1
369
insert_long_into_buffer(buffer, start, number)
char buffer[];
int start;
long number;
{
union long_char_union lsu;
lsu.l_num
= number;
buffer[start+0] = lsu.l_alpha[0];
buffer[start+1] = lsu.l_alpha[1];
buffer[start+2] = lsu.l_alpha[2];
buffer[start+3] = lsu.l_alpha[3];
} /* ends insert_short_into_buffer */
/***************************************
*
*
insert_ulong_into_buffer(...
*
*
This inserts a four byte unsigned
*
long into a buffer of characters.
*
It does this is LSB order.
*
***************************************/
insert_ulong_into_buffer(buffer, start, number)
char buffer[];
int start;
unsigned long number;
{
union ulong_char_union lsu;
lsu.l_num
= number;
buffer[start+0] = lsu.l_alpha[0];
buffer[start+1] = lsu.l_alpha[1];
buffer[start+2] = lsu.l_alpha[2];
buffer[start+3] = lsu.l_alpha[3];
} /* ends insert_ulong_into_buffer */
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370
APPENDIX F. SOURCE CODE LISTINGS
Listing 1.2 - The TIFF I/O Routines
/******************************************
*
*
read_bmp_file_header(...
*
*
This function reads the bmpfileheader
*
structure from the top of a bmp
*
image file.
*
******************************************/
read_bmp_file_header(file_name,
file_header)
char *file_name;
struct bmpfileheader *file_header;
{
char buffer[10];
long ll;
short ss;
unsigned long ull;
unsigned short uss;
FILE
*fp;
fp = fopen(file_name, "rb");
fread(buffer, 1, 2, fp);
extract_ushort_from_buffer(buffer, 1, 0, &uss);
file_header->filetype = uss;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
file_header->filesize = ull;
fread(buffer, 1, 2, fp);
extract_short_from_buffer(buffer, 1, 0, &ss);
file_header->reserved1 = ss;
fread(buffer, 1, 2, fp);
extract_short_from_buffer(buffer, 1, 0, &ss);
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F.1. CODE LISTINGS FOR CHAPTER 1
371
file_header->reserved2 = ss;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
file_header->bitmapoffset = ull;
fclose(fp);
} /* ends read_bmp_file_header */
/******************************************
*
*
read_bm_header(...
*
*
This function reads the bitmapheader
*
structure from the top of a bmp
*
image file.
*
******************************************/
read_bm_header(file_name,
bmheader)
char *file_name;
struct bitmapheader *bmheader;
{
char buffer[10];
long ll;
short ss;
unsigned long ull;
unsigned short uss;
FILE *fp;
fp = fopen(file_name, "rb");
/****************************************
*
*
Seek past the first 14 byte header.
*
****************************************/
fseek(fp, 14, SEEK_SET);
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372
APPENDIX F. SOURCE CODE LISTINGS
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
bmheader->size = ull;
fread(buffer, 1, 4, fp);
extract_long_from_buffer(buffer, 1, 0, &ll);
bmheader->width = ll;
fread(buffer, 1, 4, fp);
extract_long_from_buffer(buffer, 1, 0, &ll);
bmheader->height = ll;
fread(buffer, 1, 2, fp);
extract_ushort_from_buffer(buffer, 1, 0, &uss);
bmheader->planes = uss;
fread(buffer, 1, 2, fp);
extract_ushort_from_buffer(buffer, 1, 0, &uss);
bmheader->bitsperpixel = uss;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
bmheader->compression = ull;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
bmheader->sizeofbitmap = ull;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
bmheader->horzres = ull;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
bmheader->vertres = ull;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
bmheader->colorsused = ull;
fread(buffer, 1, 4, fp);
extract_ulong_from_buffer(buffer, 1, 0, &ull);
bmheader->colorsimp = ull;
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F.1. CODE LISTINGS FOR CHAPTER 1
373
fclose(fp);
} /* ends read_bm_header */
/******************************************
*
*
read_color_table(...
*
*
This function reads the color table
*
from a bmp image file.
*
******************************************/
read_color_table(file_name, rgb, size)
char
*file_name;
struct ctstruct *rgb;
int
size;
{
int i;
char buffer[10];
FILE *fp;
fp = fopen(file_name, "rb");
fseek(fp, 54, SEEK_SET);
for(i=0; i<size; i++){
fread(buffer, 1, 1, fp);
rgb[i].blue = buffer[0];
fread(buffer, 1, 1, fp);
rgb[i].green = buffer[0];
fread(buffer, 1, 1, fp);
rgb[i].red = buffer[0];
fread(buffer, 1, 1, fp);
/* fourth byte nothing */
} /* ends loop over i */
fclose(fp);
} /* ends read_color_table */
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374
APPENDIX F. SOURCE CODE LISTINGS
/******************************************
*
*
read_bmp_image(...
*
*
This function reads the image array
*
from a bmp file.
*
*
It only works for 8-bit images.
*
******************************************/
read_bmp_image(file_name, array)
char *file_name;
short **array;
{
FILE
*fp;
int
i, j;
int
negative = 0,
pad
= 0,
place
= 0;
long
colors
= 0,
height
= 0,
position = 0,
width
= 0;
struct bmpfileheader file_header;
struct bitmapheader bmheader;
struct ctstruct rgb[GRAY_LEVELS+1];
unsigned char uc;
read_bmp_file_header(file_name, &file_header);
read_bm_header(file_name, &bmheader);
if(bmheader.bitsperpixel != 8){
printf("\nCannot read image when bits per"
"pixel is not 8");
exit(1);
}
if(bmheader.colorsused == 0)
colors = GRAY_LEVELS + 1;
else
colors = bmheader.colorsused;
F.1. CODE LISTINGS FOR CHAPTER 1
375
read_color_table(file_name, &rgb, colors);
fp = fopen(file_name, "rb");
fseek(fp, file_header.bitmapoffset, SEEK_SET);
width = bmheader.width;
if(bmheader.height < 0){
height
= bmheader.height * (-1);
negative = 1;
}
else
height = bmheader.height;
pad = calculate_pad(width);
for(i=0; i<height; i++){
for(j=0; j<width; j++){
place = fgetc(fp);
uc = (place & 0xff);
place = uc;
array[i][j] = rgb[place].blue;
} /* ends loop over j */
if(pad != 0){
position = fseek(fp, pad, SEEK_CUR);
} /* ends if pad 1= 0 */
} /* ends loop over i */
if(negative == 0)
flip_image_array(array, height, width);
} /* ends read_bmp_image */
/******************************************
*
*
create_bmp_file_if_needed(...
*
*
This function allocates a bmp image
*
file it it does not exist. It uses
*
the header information from the input
*
image name.
*
376
APPENDIX F. SOURCE CODE LISTINGS
******************************************/
create_bmp_file_if_needed(in_name, out_name, out_image)
char in_name[], out_name[];
short **out_image;
{
int
length, width;
struct bmpfileheader file_header;
struct bitmapheader bmheader;
if(does_not_exist(out_name)){
printf("\n\n output file does not exist %s",
out_name);
read_bm_header(in_name, &bmheader);
create_allocate_bmp_file(out_name, &file_header, &bmheader);
printf("\nBFIN> Created %s", out_name);
} /* ends if does_not_exist */
} /* ends bmp_file_if_needed */
/*********************************************
*
*
create_allocate_bmp_file(...
*
*
The calling routine must set the
*
height and width. This routine will set
*
everything else.
*
**********************************************/
create_allocate_bmp_file(file_name,
file_header,
bmheader)
char *file_name;
struct bmpfileheader *file_header;
struct bitmapheader *bmheader;
{
char buffer[100];
int i, pad = 0;
FILE *fp;
pad = calculate_pad(bmheader->width);
F.1. CODE LISTINGS FOR CHAPTER 1
377
bmheader->size
= 40;
bmheader->planes
=
1;
bmheader->bitsperpixel =
8;
bmheader->compression =
0;
bmheader->sizeofbitmap = bmheader->height *
(bmheader->width + pad);
bmheader->horzres
= 300;
bmheader->vertres
= 300;
bmheader->colorsused
= 256;
bmheader->colorsimp
= 256;
file_header->filetype
= 0x4D42;
file_header->reserved1
= 0;
file_header->reserved2
= 0;
file_header->bitmapoffset = 14 +
bmheader->size +
bmheader->colorsused*4;
file_header->filesize
= file_header->bitmapoffset +
bmheader->sizeofbitmap;
if((fp = fopen(file_name, "wb")) == NULL){
printf("\nERROR Could not create file %s",
file_name);
exit(2);
}
/*********************************************
*
*
Write the 14-byte bmp file header.
*
*********************************************/
insert_ushort_into_buffer(buffer, 0, file_header->filetype);
fwrite(buffer, 1, 2, fp);
insert_ulong_into_buffer(buffer, 0, file_header->filesize);
fwrite(buffer, 1, 4, fp);
insert_short_into_buffer(buffer, 0, file_header->reserved1);
fwrite(buffer, 1, 2, fp);
insert_short_into_buffer(buffer, 0, file_header->reserved2);
fwrite(buffer, 1, 2, fp);
378
APPENDIX F. SOURCE CODE LISTINGS
insert_ulong_into_buffer(buffer, 0, file_header->bitmapoffset);
fwrite(buffer, 1, 4, fp);
/*********************************************
*
*
Write the 40-byte bit map header.
*
*********************************************/
insert_ulong_into_buffer(buffer, 0, bmheader->size);
fwrite(buffer, 1, 4, fp);
insert_long_into_buffer(buffer, 0, bmheader->width);
fwrite(buffer, 1, 4, fp);
insert_long_into_buffer(buffer, 0, bmheader->height);
fwrite(buffer, 1, 4, fp);
insert_ushort_into_buffer(buffer, 0, bmheader->planes);
fwrite(buffer, 1, 2, fp);
insert_ushort_into_buffer(buffer, 0, bmheader->bitsperpixel);
fwrite(buffer, 1, 2, fp);
insert_ulong_into_buffer(buffer, 0, bmheader->compression);
fwrite(buffer, 1, 4, fp);
insert_ulong_into_buffer(buffer, 0, bmheader->sizeofbitmap);
fwrite(buffer, 1, 4, fp);
insert_ulong_into_buffer(buffer, 0, bmheader->horzres);
fwrite(buffer, 1, 4, fp);
insert_ulong_into_buffer(buffer, 0, bmheader->vertres);
fwrite(buffer, 1, 4, fp);
insert_ulong_into_buffer(buffer, 0, bmheader->colorsused);
fwrite(buffer, 1, 4, fp);
insert_ulong_into_buffer(buffer, 0, bmheader->colorsimp);
fwrite(buffer, 1, 4, fp);
/*********************************************
*
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