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111 lines
3.0 KiB
Plaintext
111 lines
3.0 KiB
Plaintext
== Introduction ==
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RuneScape uses a number of standard and non-standard data types.
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== Byte Order ==
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Data types that are two bytes or larger can be stored and ordered in a variety of different ways. Generally people either use big endian or little endian.
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=== Big Endian ===
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In big endian order, the most significant byte (MSB) is stored first and the least significant byte (LSB) is stored last.
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=== Little Endian ===
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In little endian order, the least significant byte (LSB) is stored first and the most significant byte (MSB) is stored last.
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=== Byte order in RuneScape ===
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RuneScape uses both little and big-endian byte orders throughout the protocol (however, the 194 client only uses big-endian order), presumably to make reverse-engineering of the protocol harder. Some confusion has arisen over the byte order as the data types are named incorrectly in [[Server Winterlove|Winterlove]]'s server where little endian data types are incorrectly named as big endian types.
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== Standard data types ==
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These datatypes can also be read/written by a DataWriter/DataReader implementation (DataStreams and Buffers)
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Naming conventions:
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{| border=2
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! Official name
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! Datatype name
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! Jagex name
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! Encoding
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| Byte
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| byte
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| 1,1b
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| [[Word|WORD]]
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| short
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| 2,2b
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| [[DWord|DWORD]]
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| int,int32
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| 4,4b
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| [[QWord|QWORD]]
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| long,int64
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| 8,8b
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| C style string
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| string,String,char *,char[]
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| str,strbyte
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| text bytes then '\n' or 10
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| Java style string
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| string,String,char *,char[]
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| strraw
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| WORD length then text bytes
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|}
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Note that [[Jagex]] used to use a new line character as string terminator, in more recent versions they use the
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null character \0 or 0 to support multi-line strings.
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== Non Standard Data Types ==
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{| border=2
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! Winterlove's name
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! Jagex name
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! Read transformation
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! Write transformation
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| Special A
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| Unknown
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| value - 128
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| value + 128
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| Special C
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| Unknown
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| 0 - value
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| 0 - value
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| Special S
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| Unknown
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| 128 - value
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| 128 - value
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| SpaceSaverA
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| smarts
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| (value[0] < 128) ? (((value[0] - 128)<<8)+value[1]) : value[0]
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| if(value < 128) putword(value+32768) else putbyte(value);
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|-
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| SpaceSaverB
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| smart
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| (value[0] < 128) ? value[0] - 64 | ((value[0]<<8)+value[1]) - 49152
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| if(i < 64 && i >= -64) putbyte(i + 64) else if(i < 16384 && i >= -16384) putword(i + 49152);
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|-
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| tribyte / RGBColour / 3Byte / int3 / medium
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| 3
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| (value[0] << 24) + (value[1] << 16) + value[2]
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| putbyte(value >> 24);putbyte(value >> 16);putbyte(value);
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| [[RS String|RS_String]]
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| jstr
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| Old engine: read until newline delimiter ("\n") <br />New engine: read until null byte (value 0).
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| Old engine: write and finish with newline delimiter ("\n") <br />New engine: write and finish with null byte (value 0).
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|}
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Additionally, RuneScape also uses two integers that are different from a big- or low endian order. Both byte orders are called middle endian. Their orders could be described as following:
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Middle endian big int: C3 D4 A1 B2
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Middle endian small int: B2 A1 D4 C3
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(A1 smallest D4 biggest byte) |