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digitalmars.D.learn - Reading hexidecimal from a file

reply Neurone <dtvictorious gmail.com> writes:
Hi,

I want to read a text file that contains sha1 hashes in 
hexidecimal, then convert the hashes back into ubyte[20]. 
Examples of some lines:
E9785DC5  D43B5F67  F1B7D1CB  33279B7C  284E2593
04150E8F  1840BCA2  972BE1C5  2DE81039  0C486F9C

How can I do this? The documentation for format strings is pretty 
dense, so couldn't understand most of it.
Sep 10 2016
parent reply Basile B. <b2.temp gmx.com> writes:
On Saturday, 10 September 2016 at 12:04:08 UTC, Neurone wrote:

 Hi,

 I want to read a text file that contains sha1 hashes in 
 hexidecimal, then convert the hashes back into ubyte[20]. 
 Examples of some lines:
 E9785DC5  D43B5F67  F1B7D1CB  33279B7C  284E2593
 04150E8F  1840BCA2  972BE1C5  2DE81039  0C486F9C

 How can I do this? The documentation for format strings is 
 pretty dense, so couldn't understand most of it.


at compile time you can do:

import std.conv;
enum array = hexString!(import(theFile));

the run-time version was proposed 
(https://github.com/dlang/phobos/pull/4487) but not interesting 
enough ;)
Sep 10 2016
parent reply Basile B. <b2.temp gmx.com> writes:
On Saturday, 10 September 2016 at 12:12:28 UTC, Basile B. wrote:

 On Saturday, 10 September 2016 at 12:04:08 UTC, Neurone wrote:

 Hi,

 I want to read a text file that contains sha1 hashes in 
 hexidecimal, then convert the hashes back into ubyte[20]. 
 Examples of some lines:
 E9785DC5  D43B5F67  F1B7D1CB  33279B7C  284E2593
 04150E8F  1840BCA2  972BE1C5  2DE81039  0C486F9C

 How can I do this? The documentation for format strings is 
 pretty dense, so couldn't understand most of it.


 at compile time you can do:

 import std.conv;
 enum array = hexString!(import(theFile));

 the run-time version was proposed 
 (https://github.com/dlang/phobos/pull/4487) but not interesting 
 enough ;)


No actually, it has nothing to do with you question!

what you have to do is probably:

split join chunck(2) to!ubyte

sorry leaving now.
Sep 10 2016
next sibling parent rikki cattermole <rikki cattermole.co.nz> writes:
On 11/09/2016 12:18 AM, Basile B. wrote:

 On Saturday, 10 September 2016 at 12:12:28 UTC, Basile B. wrote:

 On Saturday, 10 September 2016 at 12:04:08 UTC, Neurone wrote:

 Hi,

 I want to read a text file that contains sha1 hashes in hexidecimal,
 then convert the hashes back into ubyte[20]. Examples of some lines:
 E9785DC5  D43B5F67  F1B7D1CB  33279B7C  284E2593
 04150E8F  1840BCA2  972BE1C5  2DE81039  0C486F9C

 How can I do this? The documentation for format strings is pretty
 dense, so couldn't understand most of it.


 at compile time you can do:

 import std.conv;
 enum array = hexString!(import(theFile));

 the run-time version was proposed
 (https://github.com/dlang/phobos/pull/4487) but not interesting enough ;)


 No actually, it has nothing to do with you question!

 what you have to do is probably:

 split join chunck(2) to!ubyte

 sorry leaving now.


Actually you'd want to filter out e.g. white space as well.
So the long form via an input range would be:

struct GetHex(T) {
	string from;
	T next;
	
	this(string input) {
		from = input;
		popFront;
	}
	
	 property {
		bool empty() { return from.length == 0 || next == 0; }
		
		T front() { return next; }
	}
	
	void popFront() {
		next = 0;
		
		char[T.sizeof * 2] got;
		ubyte count;
		
		while(count < got.length && from.length > 0) {
			got[count] = nextChar;
			if (got[count] != 0)
				count++;
		}

		import std.conv : parse;
		if (count > 0) {
			char[] temp = got[0 .. count];
			next = parse!T(temp, 16);
		}
	}
	
	char nextChar() {
		char readIn = from[0];
		from = from[1 .. $];
		
		if ((readIn >= 'A' && readIn <= 'F') || (readIn >= 'a' && readIn <= 'f'))
			return readIn;
		else if (readIn >= '0' && readIn <= '9')
			return readIn;
		else
			return 0;
	}
}

void main() {
	string source = "
E9785DC5  D43B5F67  F1B7D1CB  33279B7C  284E2593
04150E8F  1840BCA2  972BE1C5  2DE81039  0C486F9C";
	import std.stdio : writeln;
	
	writeln(GetHex!uint(source));
}
Sep 10 2016
prev sibling parent Basile B. <b2.temp gmx.com> writes:
On Saturday, 10 September 2016 at 12:18:22 UTC, Basile B. wrote:

 On Saturday, 10 September 2016 at 12:12:28 UTC, Basile B. wrote:

 On Saturday, 10 September 2016 at 12:04:08 UTC, Neurone wrote:

 Hi,

 I want to read a text file that contains sha1 hashes in 
 hexidecimal, then convert the hashes back into ubyte[20]. 
 Examples of some lines:
 E9785DC5  D43B5F67  F1B7D1CB  33279B7C  284E2593
 04150E8F  1840BCA2  972BE1C5  2DE81039  0C486F9C

 How can I do this? The documentation for format strings is 
 pretty dense, so couldn't understand most of it.


 at compile time you can do:

 import std.conv;
 enum array = hexString!(import(theFile));

 the run-time version was proposed 
 (https://github.com/dlang/phobos/pull/4487) but not 
 interesting enough ;)


 No actually,


Finally i would have worked, after cast(ubyte[]) 
hexString(stuff).array;
fart...
Sep 10 2016