Hey Yoshiki!
Thanks for the response. I knownits not correct because I know what the data value should be of those 4 byte at that position in the read, and the number is way to big I to suspect byte ordering.
Cody
On Tue, May 7, 2024, 7:42 PM Thiede, Christoph < Christoph.Thiede@student.hpi.uni-potsdam.de> wrote:
You could add your own #uint32LittleEndian on PositionableStream:
PositionableStream>>uint32LittleEndian
^ self next
- (self next bitShift: 8)
- (self next bitShift: 16)
- (self next bitShift: 24)
#[1 2 3 4] readStream uint32LittleEndian hex. '16r4030201'
Another possibility would be to convert the bytes into a WordArray:
#[1 2 3 4] readStream uint32 hex. --> '16r1020304' ((#[1 2 3 4] readStream next: 4) changeClassTo: WordArray) first hex. --> '16r4030201'
For reading many numbers from the stream, this should be even more efficient than #uint32 as no manual combination of bytes happens in the image:
(((1 to: 16) asByteArray readStream next: 16) changeClassTo: WordArray) collect: #hex as: Array. --> #('16r4030201' '16r8070605' '16rC0B0A09' '16r100F0E0D')
Best, Christoph
*Von:* Yoshiki Ohshima via Beginners <beginners@lists.squeakfoundation.org
*Gesendet:* Mittwoch, 8. Mai 2024 01:37 Uhr *An:* A friendly place to get answers to even the most basic questions about Squeak. beginners@lists.squeakfoundation.org *Cc:* Yoshiki Ohshima Yoshiki.Ohshima@acm.org *Betreff:* [Newbies] Re: Need ByteArray Interpreted as Base 10 UnsignedInt of 32 bits.
When you say "result is simply incorrect", can you explain the way it is incorrect? Is it perhaps the byte order issue? (I am not familiar with "doom wads" so there may be an obvious answer).
I would start from code snippet that looks like:
(ReadStream on: #(1 2 3 4)) uint32 hex
That evaluates to '16r1020304'.
And replace the (ReadStream ...) part with your data.
On Tue, May 7, 2024 at 6:55 AM Cody Sevier sevierit@gmail.com wrote:
I should note that I have tried to use the positionableStreams uint32 message for of advancing the stream but the result is simply incorrect.
Cody
On Tue, May 7, 2024 at 8:43 AM Cody Sevier sevierit@gmail.com wrote:
Hello Squeakers,
I have an algorithm for reading doom wads working in Pharo that I would like to convert to Squeak, however, I cant for the life of me figure out how to interpret a byte array of 4 bytes as an Unsigned Int. I see that a ByteArray IS an UnsignedIntCollection, but cant seem to figure out how to use it as such.
Functional Pharo: binaryStream := wad binaryReadStream. wadType := (binaryStream next: 4) asString. numberOfDirectories := (binaryStream next: 4) uint32AtOffset: 0. byteOffsetToDirectories := (binaryStream next: 4) uint32AtOffset: 0.
Semi Functional Squeak: binaryStream := (FileStream readOnlyFileNamed: aFileLocation) binary yourself . wadType := (binaryStream next: 4) asString. numberOfDirectories :=(binaryStream next: 4). ? byteOffsetToDirectories := (binaryStream next: 4). ?
Thanks for your assistance!
Kind Regards, Cody
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-- -- Yoshiki
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