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Finding a jpeg in an array of bytes
func isJPEG(fileBlock []byte) (result bool) {
result = false
if (fileBlock[0] == 0xff && fileBlock[1] == 0xd8 && fileBlock[2] == 0xff && (fileBlock[3] == 0xe0 || fileBlock[3] == 0x0e1)) {
result = true
}
return result
}
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