I have some binary data in a file im reading (Hex):
00 00 00 18 66 74 79 70
I read the file and convert it to an arrayBuffer and both Uint8Array and Uint16Array.
const arrayBuffer = await selectedFile.arrayBuffer()
const uint8Array = new Uint8Array(arrayBuffer)
const uint16Array = new UInt16Array(arrayBuffer)
The content of Uint8Array is as expected:
Decimal Hex
0: 0 0
1: 0 0
2: 0 0
3: 24 18
4: 102 66
5: 116 74
6: 121 79
7: 112 70
But in the uint16Array the two bytes are flipped.
Decimal Hex What I expected as Hex
0: 0 0 0
1: 6144 18 00 00 18
2: 29798 74 66 66 74
3: 28793 70 79 79 70
Why are the two bytes flipped? What can I do to get the right order, if e.g. I need to search 0x6674.
The endianness of the file (of the data format) is a different one than that of your processor.
If you care about endianness (and you do, if you read or write files meant to be used on different platforms), don't use a Uint16Array that always uses the platform byte order, use a DataView instead and call the getUint16 method for each index.