34 lines
878 B
JavaScript
34 lines
878 B
JavaScript
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const fs = require('fs')
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const lz4js = require('lz4js')
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buffer = new ArrayBuffer(12);
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let dataView = new DataView(buffer);
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dataView.setUint8(1,255)
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console.log(dataView.getUint8(1))
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const buf = fs.readFileSync("test.usdc")
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// magic header(8 bytes)
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const h0 = buf.readUInt8(0);
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const h1 = buf.readUInt8(1);
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const h2 = buf.readUInt8(2);
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const h3 = buf.readUInt8(3);
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const h4 = buf.readUInt8(4);
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const h5 = buf.readUInt8(5);
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const h6 = buf.readUInt8(6);
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const h7 = buf.readUInt8(7);
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console.log(h0)
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console.log(h1)
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console.log(h2)
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console.log('')
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console.log('P'.charCodeAt(0))
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if ((h0 == 'P'.charCodeAt(0)) && (h1 == 'X'.charCodeAt(0)) && (h2 == 'R'.charCodeAt(0)) && (h3 == '-'.charCodeAt(0)) &&
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(h4 == 'U'.charCodeAt(0)) && (h5 == 'S'.charCodeAt(0)) && (h6 == 'D'.charCodeAt(0)) && (h7 == 'C'.charCodeAt(0))) {
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// ok
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} else {
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console.log('invalid magic header')
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}
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