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Standard types · jDataView/jBinary Wiki · GitHub
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Standard types
Ingvar Stepanyan edited this page Aug 22, 2014
·
7 revisions
-
uint8
(byte
) /int8
- one-byte integer. -
uint16
/int16
- word. -
uint32
/int32
- dword (double-word). -
uint64
/int64
- qword - please see warning about precision loss in jDataView documentation.
-
float32
(float
) - classic 32-bitfloat
used in languages like C. -
float64
(double
) - 64-bit float with double precision (double
in C), default for JavaScript number representation.
-
char
- one-byte binary character. -
string(@length, encoding = 'binary')
- string of given length in binary or 'utf8' encoding, reads/writes to the end of binary iflength
is not given. -
string0(@length, encoding = 'binary')
- null-terminated string stored in given number of bytes; treated as dynamic null-terminated string iflength
is not given.
See info about encoding in jDataView documentation.
-
const(baseType, value, strict = false)
- treats type as constant; if read value does not match expected and strict mode is enabled, callsstrict(readValue)
if it is function or simply throwsTypeError
if not. -
array(baseType, @length)
- array of given type and length, reads/writes to the end of binary iflength
is not given. -
object(structure, proto = Object.prototype)
- complex object of given structure (name => type), creates new context while processing inner properties; object may also contain functions instead of types for calculating some values during read/write for internal purposes. -
extend(...object structures...)
- extends one structure with others; merges data into one object when reading and passing entire object when writing. -
enum(baseType, matches)
- enumeration type with given key <=> value map (if value not found in the map, it's used "as-is").
-
bitfield(length)
- unsigned integer of given bit length (supports up to 32 bits, wraps around 2^32). -
blob(@length)
- byte array represented in most native type for current engine; reads/writes to the end of binary iflength
is not given. -
binary(@length, typeSet = {})
- jBinary instance on part of original one with given length and optional custom typeset (useful for container formats); accepts also raw binary data when writing.
-
if(@condition, trueType, falseType)
- conditional statement. -
if_not(@condition, falseType, trueType)
- same but inverted. -
skip(@length)
- simply skips given length on read/write.
All the arguments marked with @
(references) can be passed not only as direct values, but also as getter functions callback(context)
or string property names inside current context chain.
Examples:
binary.read({
count: 'uint32',
bytes: ['array', 'uint8', 'count']
});
binary.read({
recordSize: 'uint32',
data: ['array', 'uint8', function (context) {
return context.recordSize - 4; // total size except `size` field itself
}]
});
Usually, in-built types are not enough for handling complicated structures since you might want to create and re-use some own types built on top of standard ones. For such cases, you might want to have look at jBinary.Type.
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