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specification.rst 3.45 KiB

MiniJSON specification

MiniJSON is a space-aware binary encoding for a JSON.

All data is stored as bigger endian.

By char I mean uint8. By short I mean uint16. By int I mean uint32.

Type Value consists of:

  • unsigned char value

  • unsigned char * data

  • If value's highest bit is turned on, then remains are a UTF-8 string with len of (value & 0x7F)

  • If value's two highest bits are 0100 or 0101, then four lowest bits encode the number of elements, and the four highest bits encode type of the object: * 0100 - a list * 0101 - an object whose keys are all strings * 0110 - an object whose keys are not all strings (see value of 19 and 20 to know how it's

    represented).

    • Standard representation for a non-key-string object (value 19), string key object (value 11) or list (value 7) follows, sans the element count.

  • If value is zero, then next character is the length of the string followed by the string

  • If value is 1, then next data is signed int

  • If value is 2, then next data is signed short

  • If value is 3, then next data is signed char

  • If value is 4, then next data is unsigned int

  • If value is 5, then next data is unsigned short

  • If value is 6, then next data is unsigned char

  • If value is 7, then next data is number of elements of a list, follows by Value of each element

  • If value is 8, the value is a NULL

  • If value is 9, then next element is a IEEE single

  • If value is 10, then next element is a IEEE double

  • If value is 11, then next element is amount of entries for an object, then there goes the length of the field name, followed by field name in UTF-8, and then goes the Value of the element

  • If value is 12, then next data is unsigned int24

  • If value is 13, then next data is an unsigned short representing the count of characters, and then these characters follow and are interpreted as a UTF-8 string

  • If value is 14, then next data is an unsigned int representing the count of characters, and then these characters follow and are interpreted as a UTF-8 string

  • If value is 15, then next data is a unsigned short, and then a list follows of that many elements

  • If value is 16, then next data is a unsigned int, and then a list follows of that many elements

  • If value is 17, then next data is a unsigned short, and then an object follows of that many elements

  • If value is 18, then next data is an unsigned int, and then an object follows of that many elements

  • If value is 19, then next data is an unsigned int, and then follow that many pairs of Values (key: value)

  • If value is 20, then next data is an unsigned char, and then follow that many pairs of Values (key: value)

  • If value is 21, then next data is an unsigned short, and then follow that many pairs of Values (key: value)

  • If value is 22, then it's True

  • If value is 23, then it's False

  • If value is 24, then next what comes is count of bytes, and then bytes follow. This is to be

    interpreted as a signed integer

  • If value is 25, then next comes an unsigned char denoting the length of the bytes, and

    the remainder is binary data

  • If value is 26, then next comes an unsigned short denoting the length of the bytes, and

    the remainder is binary data

  • If value is 27, then next comes an unsigned int denoting the length of the bytes, and

    the remainder is binary data

Coder should encode the value as one having the smallest binary representation, but that is not required. Decoder must parse any arbitrary valid string.