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141 lines
3.0 KiB
CoffeeScript
141 lines
3.0 KiB
CoffeeScript
class Data
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constructor: (@data = []) ->
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@pos = 0
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@length = @data.length
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readByte: ->
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@data[@pos++]
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writeByte: (byte) ->
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@data[@pos++] = byte
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byteAt: (index) ->
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@data[index]
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readBool: ->
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return !!@readByte()
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writeBool: (val) ->
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@writeByte if val then 1 else 0
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readUInt32: ->
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b1 = @readByte() * 0x1000000
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b2 = @readByte() << 16
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b3 = @readByte() << 8
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b4 = @readByte()
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b1 + b2 + b3 + b4
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writeUInt32: (val) ->
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@writeByte (val >>> 24) & 0xff
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@writeByte (val >> 16) & 0xff
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@writeByte (val >> 8) & 0xff
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@writeByte val & 0xff
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readInt32: ->
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int = @readUInt32()
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if int >= 0x80000000 then int - 0x100000000 else int
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writeInt32: (val) ->
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val += 0x100000000 if val < 0
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@writeUInt32 val
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readUInt16: ->
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b1 = @readByte() << 8
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b2 = @readByte()
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b1 | b2
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writeUInt16: (val) ->
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@writeByte (val >> 8) & 0xff
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@writeByte val & 0xff
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readInt16: ->
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int = @readUInt16()
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if int >= 0x8000 then int - 0x10000 else int
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writeInt16: (val) ->
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val += 0x10000 if val < 0
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@writeUInt16 val
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readString: (length) ->
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ret = []
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for i in [0...length]
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ret[i] = String.fromCharCode @readByte()
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return ret.join ''
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writeString: (val) ->
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for i in [0...val.length]
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@writeByte val.charCodeAt(i)
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stringAt: (@pos, length) ->
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@readString length
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readShort: ->
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@readInt16()
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writeShort: (val) ->
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@writeInt16 val
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readLongLong: ->
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b1 = @readByte()
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b2 = @readByte()
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b3 = @readByte()
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b4 = @readByte()
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b5 = @readByte()
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b6 = @readByte()
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b7 = @readByte()
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b8 = @readByte()
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if b1 & 0x80 # sign -> avoid overflow
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return ((b1 ^ 0xff) * 0x100000000000000 +
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(b2 ^ 0xff) * 0x1000000000000 +
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(b3 ^ 0xff) * 0x10000000000 +
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(b4 ^ 0xff) * 0x100000000 +
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(b5 ^ 0xff) * 0x1000000 +
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(b6 ^ 0xff) * 0x10000 +
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(b7 ^ 0xff) * 0x100 +
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(b8 ^ 0xff) + 1) * -1
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return b1 * 0x100000000000000 +
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b2 * 0x1000000000000 +
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b3 * 0x10000000000 +
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b4 * 0x100000000 +
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b5 * 0x1000000 +
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b6 * 0x10000 +
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b7 * 0x100 +
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b8
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writeLongLong: (val) ->
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high = Math.floor(val / 0x100000000)
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low = val & 0xffffffff
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@writeByte (high >> 24) & 0xff
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@writeByte (high >> 16) & 0xff
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@writeByte (high >> 8) & 0xff
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@writeByte high & 0xff
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@writeByte (low >> 24) & 0xff
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@writeByte (low >> 16) & 0xff
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@writeByte (low >> 8) & 0xff
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@writeByte low & 0xff
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readInt: ->
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@readInt32()
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writeInt: (val) ->
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@writeInt32 val
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slice: (start, end) ->
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@data.slice start, end
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read: (bytes) ->
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buf = []
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for i in [0...bytes]
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buf.push @readByte()
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return buf
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write: (bytes) ->
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for byte in bytes
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@writeByte byte
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module.exports = Data
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