I have the following C# Code
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
namespace Unpac {
class Program {
//_____________________________________________________________________
static string input_filename_no_ext;
static int current_output_index;
static string output_directory;
static List<byte> output_buffer;
static int image_height;
static int line_min_length;
static int line_max_length;
//_____________________________________________________________________
static void Main(string[] args) {
int? forced_image_width;
string input_fullpath;
string input_directory;
string input_filename;
byte[] input_data;
long input_max_valid_position;
long current_input_position;
byte input_byte;
byte RLE_sumador;
int count;
byte b;
int n;
bool RLE_FC_swap;
byte b2;
int width_current;
if(args.Length<2) {
Console.WriteLine("Use: unpac.exe <InputFile.pac> <OutputDir> [ImageWidth]");
return;
}
if(args.Length>2) {
forced_image_width = int.Parse(args[2]);
} else {
forced_image_width = null;
}
try {
input_fullpath = Path.GetFullPath(args[0]);
input_directory = Path.GetDirectoryName(input_fullpath);
input_filename = Path.GetFileName(input_fullpath);
input_fullpath = Path.Combine(input_directory, input_filename);
if(!File.Exists(input_fullpath)) throw new Exception();
int p = input_filename.LastIndexOf('.');
if(p==-1) {
input_filename_no_ext = input_filename;
} else {
input_filename_no_ext = input_filename.Substring(0, p);
}
} catch {
Console.WriteLine("ERROR: invalid input file");
return;
}
try {
output_directory = Path.GetFullPath(args[1]);
if(!Directory.Exists(output_directory)) {
Directory.CreateDirectory(output_directory);
}
} catch {
Console.WriteLine("ERROR: invalid output directory");
return;
}
try {
input_data = File.ReadAllBytes(input_fullpath);
} catch {
Console.WriteLine("ERROR: cannot read from input file");
return;
}
Console.WriteLine($"{input_filename}");
input_max_valid_position = input_data.Length - 1;
current_input_position = 0;
current_output_index = 1;
output_buffer = new List<byte>();
RLE_sumador = 0;
line_min_length = int.MaxValue;
line_max_length = 0;
width_current = 0;
image_height = 0;
while(current_input_position <= input_max_valid_position) {
input_byte = input_data[current_input_position];
current_input_position++;
if(input_byte == 0xFF) {
//==============
// Fin de chunk
//==============
Save();
current_output_index++;
RLE_sumador = 0;
line_min_length = int.MaxValue;
line_max_length = 0;
width_current = 0;
image_height = 0;
} else if(input_byte == 0xFE) {
//=================
// Siguiente linea
//=================
if(width_current < line_min_length) line_min_length = width_current;
if(width_current > line_max_length) line_max_length = width_current;
if(forced_image_width!=null) {
count = forced_image_width.Value - width_current;
if(count > 0) {
for(n=0; n<count; n++) {
output_buffer.Add(0);
}
}
}
image_height++;
width_current = 0;
} else if(input_byte == 0xFD) {
count = (int) (input_data[current_input_position]) + 1;
current_input_position++;
b = input_data[current_input_position];
current_input_position++;
for(n=0; n<count; n++) {
output_buffer.Add(b);
}
width_current += count;
} else if(input_byte == 0xFC) {
b = input_data[current_input_position];
current_input_position++;
b2 = (byte)(b + 1);
count = (int) (input_data[current_input_position]) + 1;
current_input_position++;
RLE_FC_swap = false;
for(n=0; n<count; n++) {
output_buffer.Add(
RLE_FC_swap ? b2 : b
);
RLE_FC_swap = !RLE_FC_swap;
}
width_current += count;
} else if(input_byte == 0xFB) {
RLE_sumador = input_data[current_input_position];
current_input_position++;
} else {
b = (byte)(input_byte >> 2);
b += RLE_sumador;
count = (input_byte & 3) + 1;
for(n=0; n<count; n++) {
output_buffer.Add(b);
}
width_current += count;
}
}
Save();
}
//_____________________________________________________________________
static void Save() {
if(output_buffer.Count == 0) return;
string output_filename;
string output_fullpath;
byte[] output_array;
int output_length;
bool is_valid_image;
output_filename = $"{input_filename_no_ext}.{current_output_index:D3}";
output_fullpath = Path.Combine(output_directory, output_filename);
output_array = output_buffer.ToArray();
output_length = output_array.Length;
is_valid_image = false;
if(image_height > 0) {
if(line_min_length != line_max_length) {
Console.WriteLine($" -> {output_filename} ({output_length}) (min width:{line_min_length}) (max width:{line_max_length}) (height:{image_height})");
} else {
Console.WriteLine($" -> {output_filename} ({output_length}) (width:{line_min_length}) (height:{image_height})");
is_valid_image = true;
}
} else {
Console.WriteLine($" -> {output_filename} ({output_length})");
}
try {
if(is_valid_image) {
Bitmap.Save(output_fullpath + ".bmp", output_array, line_min_length, image_height);
} else {
File.WriteAllBytes(output_fullpath, output_array);
}
} catch {
Console.WriteLine("ERROR: cannot save to output file");
}
output_buffer.Clear();
}
}
}
How can I code in C# to try the Hex values, 0x00 to 0xFF in this code for input_byte == , i.e what should I type in the posted Code, to try the range each hex value in turn ? I looked on the internet about ranges in c# but I didn’t find anything suitable, to help me with.
What I have tried:
I have tried altering the input_byte values. But I need to be able, to try all possible combineations, of all individual Hex Values i.e. there are either 255 or 256. Where it says input_byte == in the Code. I wrote, and also copy and pasted 4x256, else if Statements in my latest modification, of my Program.cs Code. But I don’t Think the Compiled Program, is doing what I wan’t to achieve.
I asked a person who has a knowledge of C# he said maybe I could try the following in a for loop ?
for(int nSomething=0; nSomething<256: n++) { doSomething(nSomething);}
Could someone suggest a modification I could make, to my original Code, using the above C# code, to achieve what I want ? obviously the Something would be replaced with other text ? I am okay with all output Files, being saved to the same Folder. There is a seperate C# Code called Bitmap.cs, which makes up the unpac program.
Any help would be much appreciated.
Regards
Eddie Winch