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 Post subject: Convert To HexPosted: Tue Nov 05, 2019 9:07 pm
 Enthusiast

Joined: Thu May 21, 2009 6:56 pm
Posts: 598
Hi

Is there a function PureBasic that converts a memory buffer to hex. For example let's say that a memory buffer contains 100 bytes. Is there a function that would return the 200 byte hex representation of the 100 binary bytes? Something like PeekH(*Buffer,100)

I know I can loop through the 100 bytes and use the Hex() function but I am looking for a fast method to convert memory buffers into hex.

Thanks
Simon

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 Post subject: Re: Convert To HexPosted: Tue Nov 05, 2019 9:31 pm

Joined: Tue Dec 23, 2003 3:54 am
Posts: 1866
swhite wrote:
Is there a function PureBasic that converts a memory buffer to hex

Nope, sorry

swhite wrote:
I know I can loop through the 100 bytes and use the Hex() function but I am looking for a fast method to convert memory buffers into hex.

This should be faster than many calls to Hex(), but the Assembly experts here can surely beat it:
Code:
Procedure.s MemoryToHexString(*Memory, Bytes.i, Lowercase.i = #False)
Protected Result.s
If (*Memory And (Bytes > 0))
If (Lowercase)
Lowercase = 'a' - 'A'
EndIf
Result = Space(Bytes * 2)
Protected *Write.CHARACTER = @Result
Protected Value.i
While (*Write\c)
Value = (*Read\b >> 4) & \$0F
Select (Value)
Case 0 To 9
*Write\c = '0' + Value
Case 10 To 15
*Write\c = 'A' + Value - 10 + Lowercase
EndSelect
*Write + SizeOf(CHARACTER)

Select (Value)
Case 0 To 9
*Write\c = '0' + Value
Case 10 To 15
*Write\c = 'A' + Value - 10 + Lowercase
EndSelect
*Write + SizeOf(CHARACTER)

Wend
EndIf
ProcedureReturn (Result)
EndProcedure

test.l = \$aa22cc44
Debug MemoryToHexString(@test, 4)

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 Post subject: Re: Convert To HexPosted: Tue Nov 05, 2019 11:51 pm
 Enthusiast

Joined: Sun Jun 11, 2006 12:07 am
Posts: 587
Location: Near Hamburg
Hello, Simon,

in the german forum there was a similar thread with some example codes: https://www.purebasic.fr/german/viewtop ... =8&t=29368

Remark: Don't use the first code in the thread.

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 Post subject: Re: Convert To HexPosted: Wed Nov 06, 2019 2:00 am
 Enthusiast

Joined: Thu May 21, 2009 6:56 pm
Posts: 598
This method can do 100,000 iteration in 550ms on my computer whereas the code above takes 777ms.

Code:
*Buffer = AllocateMemory(22)
PokeQ(*Buffer,\$e17d9f6604a70040)
PokeQ(*Buffer+8,\$0082022000950500)
PokeQ(*Buffer+16,\$000000005f000000)

Procedure.s NeoToHex(*tnBuf,tnLen.i)
Define ln.i,lcHex.s
For ln = 0 To tnLen - 1
lcHex = lcHex +RSet(Hex(PeekA(*tnBuf + ln),#PB_Ascii),2,"0")
Next
ProcedureReturn lcHex
EndProcedure

For ln =1 To 100000
NeoToHex(*Buffer,21)
Next

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 Post subject: Re: Convert To HexPosted: Wed Nov 06, 2019 8:02 am
 PureBasic Expert

Joined: Sun Aug 08, 2004 5:21 am
Posts: 3710
Location: Netherlands
swhite wrote:
I know I can loop through the 100 bytes and use the Hex() function but I am looking for a fast method to convert memory buffers into hex.

Here's an asm optimized module I did a few years ago. It should be fast.
viewtopic.php?p=486830#p486830

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 Post subject: Re: Convert To HexPosted: Wed Nov 06, 2019 9:38 am

Joined: Sun Sep 11, 2016 2:17 pm
Posts: 803
Im sure wilberts solution is the fastest

Anyway here is a lib that i wrote some time ago:
https://www.purebasic.fr/german/viewtopic.php?f=8&t=31304

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 Post subject: Re: Convert To HexPosted: Wed Nov 06, 2019 11:29 am
 Enthusiast

Joined: Fri Oct 16, 2009 10:12 am
Posts: 727
Location: BE
Thanks for that (updating isn't it ?) hexdata coding Wilbert.
Great stuff again.

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 Post subject: Re: Convert To HexPosted: Wed Nov 06, 2019 12:00 pm
 PureBasic Expert

Joined: Sun Aug 08, 2004 5:21 am
Posts: 3710
Location: Netherlands
Joris wrote:
Thanks for that (updating isn't it ?) hexdata coding Wilbert.
Great stuff again.

Thanks.
I only updated the example today and changed the labels to local labels. The rest of the code is still the same as a few years ago.

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 Post subject: Re: Convert To HexPosted: Wed Nov 06, 2019 5:52 pm

Joined: Wed Jun 11, 2003 9:33 pm
Posts: 4655
Location: Spa, relaxing and thinking, and learning...
I have these here stored in my collection:
Code:
Procedure DecByteSequenceToHexByteString(*seq.ascii,length.l,*HexString.ascii)
;This function converts a byte sequence stored in a given base address of sequential memory to a Hex string (.s):
For t.l=1 To length.l
*HexString\a=Asc(Hex((*seq\a>>4)&\$0F)); <-HighNibble
*HexString+1
*HexString\a=Asc(Hex(*seq\a&\$0F)); <-LowNibble
*HexString+1
*seq+1
Next
*HexString\a=0
EndProcedure
Procedure.b HexByteStringToDecByteSequence(HexString.s,*seq.ascii)
;This function converts a given Hex string (.s) to a byte sequence stored in a given base address of sequential memory:
Protected c.a,Nibbles.l=Len(HexString.s),t.l
If Nibbles.l&1:HexString.s="0"+HexString.s:Nibbles.l+1:EndIf
For t.l=1 To Nibbles.l
c.a=Asc(LCase(Mid(HexString.s,t.l,1)))
If c<'0' Or c>'f' Or (c>'9' And c<'a')
ProcedureReturn 0
EndIf
If c>'9':c=(c&\$5F)-\$07:EndIf
c-'0'
If t.l&1
*seq\a=c<<4
Else
*seq\a|c
*seq+1
EndIf
Next
ProcedureReturn 1
EndProcedure
;Test it:
*d.byte=AllocateMemory(22)
HexByteStringToDecByteSequence("e153a9a6449b16d0bd950fe6b9e762b43cdabbe4ec0193505822854c109029e9",*d.byte)
For t=1 To 22
Debug Hex(PeekB(*d.byte+t-1)&\$FF)
Next
st.s=Space(22*2)
DecByteSequenceToHexByteString(*d.byte,22,@st.s)
Debug st.s

And in i386 assembler this one:
Code:
;This function converts String to hex sequence:
!mov esi,dword[p.v_cPuntero+32]
!mov edi,dword[p.v_cBuffer+32]
!.bucle:
!je .salir
!xor edx,edx
!movzx eax,byte[esi]
!mov ebx,16
!div ebx
!mov bl, byte[numeros+eax]
!mov byte[edi],bl
!mov bl, byte[numeros+edx]
!mov byte[edi+1],bl
!inc esi
!jmp .bucle
!.salir:
ProcedureReturn
!numeros db '0123456789ABCDEF',0
EndProcedure
;Test it:
ff\$="* PureBasic *"
vv\$=Space(Len(ff\$)*2)
StringToHex(@ff\$,Len(ff\$),@vv\$)
Debug vv\$

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 Post subject: Re: Convert To HexPosted: Wed Nov 06, 2019 9:11 pm
 Enthusiast

Joined: Thu May 21, 2009 6:56 pm
Posts: 598
Hi

Using Wilbert's HexData function is much faster. It only took 21ms to do 100,000 iterations which is about 25 times faster than my method. So thanks again Wilbert for your help.

Simon

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dCipher Computing

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 Post subject: Re: Convert To HexPosted: Thu Nov 07, 2019 8:39 am
 PureBasic Expert

Joined: Sun Aug 08, 2004 5:21 am
Posts: 3710
Location: Netherlands
I added a unicode only version to my code which might perform better on recent PureBasic versions for Windows and Linux.
viewtopic.php?p=486830#p486830

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macOS 10.15 Catalina, Windows 10

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 Post subject: Re: Convert To HexPosted: Thu Nov 07, 2019 7:17 pm

Joined: Fri May 12, 2006 6:51 pm
Posts: 2805
Location: Germany
PeekH and PokeH from features request...

Thanks Wilbert for nice Idee
Code:
;-TOP

; ----

Global Dim PeekHexList.l(255)
Global Dim PokeByteList.a(255)

Procedure InitHexList()
Protected i.i
For i = 0 To 255
PokeS(@PeekHexList(i), RSet(Hex(i), 2, "0"), 2, #PB_String_NoZero)
Next
EndProcedure
InitHexList()

Procedure InitByteList()
Protected i.i, c.i
For i = '0' To '9'
PokeByteList(i) = c
c + 1
Next
c = 10
For i = 'A' To 'F'
PokeByteList(i) = c
c + 1
Next
c = 10
For i = 'a' To 'f'
PokeByteList(i) = c
c + 1
Next
EndProcedure
InitByteList()

; ----

Procedure.s PeekH_PB(*Buffer.Ascii, Len)
Protected r1.s, index
len - 1
For index = 0 To Len
r1 + RSet(Hex(*Buffer\a, #PB_Byte), 2, "0")
*Buffer + 1
Next
ProcedureReturn r1
EndProcedure

; ----

Procedure.s PeekH(*Buffer.Ascii, Len)
Protected Dim Result.l(Len)
Protected *Result.Long = @Result()
While Len
Len - 1
*Result\l = PeekHexList(*Buffer\a)
*Result + 4
*Buffer + 1
Wend
ProcedureReturn PeekS(@Result())
EndProcedure

; ----

Procedure PokeH_PB(*Buffer.Ascii, String.s)
Protected i, Len
len = Len(String)
For i = 1 To len Step 2
*Buffer\a = Val("\$"+Mid(String, i, 2))
*Buffer + 1
Next
EndProcedure

; ----

Procedure PokeH(*Buffer.Ascii, String.s)
Protected *String.unicode = @String
While *String\u
If *String\u < 256
*Buffer\a = PokeByteList(*String\u) << 4
EndIf
*String + 2
If *String\u
If *String\u < 256
*Buffer\a | PokeByteList(*String\u)
EndIf
Else
Break
EndIf
*String + 2
*buffer + 1
Wend
EndProcedure

; ----

;-Test

Define value.q

value.q = \$01020304A1B2C3D4

start = ElapsedMilliseconds()
For i = 1 To 1000000
t1.s = PeekH_PB(@value, 8)
Next
ende = ElapsedMilliseconds()
m1.s + "Time PeekH_PB = " + Str(ende - start) + "ms " + t1 + #LF\$

start = ElapsedMilliseconds()
For i = 1 To 1000000
t1.s = PeekH(@value, 8)
Next
ende = ElapsedMilliseconds()
m1.s + "Time PeekH = " + Str(ende - start) + "ms " + t1 + #LF\$

value = 0
start = ElapsedMilliseconds()
For i = 1 To 1000000
PokeH_PB(@value, "11223344A1B2C3D4")
Next
ende = ElapsedMilliseconds()
m1.s + "Time PokeH_PB = " + Str(ende - start) + "ms " + Hex(value) +#LF\$

value = 0
start = ElapsedMilliseconds()
For i = 1 To 1000000
PokeH(@value, "11223344A1B2C3D4")
Next
ende = ElapsedMilliseconds()
m1.s + "Time PokeH = " + Str(ende - start) + "ms " + Hex(value) +#LF\$
MessageRequester("Time", m1)

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