diff options
Diffstat (limited to 'go/vendor/github.com/tinylib/msgp/msgp/elsize.go')
-rw-r--r-- | go/vendor/github.com/tinylib/msgp/msgp/elsize.go | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/go/vendor/github.com/tinylib/msgp/msgp/elsize.go b/go/vendor/github.com/tinylib/msgp/msgp/elsize.go new file mode 100644 index 0000000..95762e7 --- /dev/null +++ b/go/vendor/github.com/tinylib/msgp/msgp/elsize.go @@ -0,0 +1,99 @@ +package msgp + +// size of every object on the wire, +// plus type information. gives us +// constant-time type information +// for traversing composite objects. +// +var sizes = [256]bytespec{ + mnil: {size: 1, extra: constsize, typ: NilType}, + mfalse: {size: 1, extra: constsize, typ: BoolType}, + mtrue: {size: 1, extra: constsize, typ: BoolType}, + mbin8: {size: 2, extra: extra8, typ: BinType}, + mbin16: {size: 3, extra: extra16, typ: BinType}, + mbin32: {size: 5, extra: extra32, typ: BinType}, + mext8: {size: 3, extra: extra8, typ: ExtensionType}, + mext16: {size: 4, extra: extra16, typ: ExtensionType}, + mext32: {size: 6, extra: extra32, typ: ExtensionType}, + mfloat32: {size: 5, extra: constsize, typ: Float32Type}, + mfloat64: {size: 9, extra: constsize, typ: Float64Type}, + muint8: {size: 2, extra: constsize, typ: UintType}, + muint16: {size: 3, extra: constsize, typ: UintType}, + muint32: {size: 5, extra: constsize, typ: UintType}, + muint64: {size: 9, extra: constsize, typ: UintType}, + mint8: {size: 2, extra: constsize, typ: IntType}, + mint16: {size: 3, extra: constsize, typ: IntType}, + mint32: {size: 5, extra: constsize, typ: IntType}, + mint64: {size: 9, extra: constsize, typ: IntType}, + mfixext1: {size: 3, extra: constsize, typ: ExtensionType}, + mfixext2: {size: 4, extra: constsize, typ: ExtensionType}, + mfixext4: {size: 6, extra: constsize, typ: ExtensionType}, + mfixext8: {size: 10, extra: constsize, typ: ExtensionType}, + mfixext16: {size: 18, extra: constsize, typ: ExtensionType}, + mstr8: {size: 2, extra: extra8, typ: StrType}, + mstr16: {size: 3, extra: extra16, typ: StrType}, + mstr32: {size: 5, extra: extra32, typ: StrType}, + marray16: {size: 3, extra: array16v, typ: ArrayType}, + marray32: {size: 5, extra: array32v, typ: ArrayType}, + mmap16: {size: 3, extra: map16v, typ: MapType}, + mmap32: {size: 5, extra: map32v, typ: MapType}, +} + +func init() { + // set up fixed fields + + // fixint + for i := mfixint; i < 0x80; i++ { + sizes[i] = bytespec{size: 1, extra: constsize, typ: IntType} + } + + // nfixint + for i := uint16(mnfixint); i < 0x100; i++ { + sizes[uint8(i)] = bytespec{size: 1, extra: constsize, typ: IntType} + } + + // fixstr gets constsize, + // since the prefix yields the size + for i := mfixstr; i < 0xc0; i++ { + sizes[i] = bytespec{size: 1 + rfixstr(i), extra: constsize, typ: StrType} + } + + // fixmap + for i := mfixmap; i < 0x90; i++ { + sizes[i] = bytespec{size: 1, extra: varmode(2 * rfixmap(i)), typ: MapType} + } + + // fixarray + for i := mfixarray; i < 0xa0; i++ { + sizes[i] = bytespec{size: 1, extra: varmode(rfixarray(i)), typ: ArrayType} + } +} + +// a valid bytespsec has +// non-zero 'size' and +// non-zero 'typ' +type bytespec struct { + size uint8 // prefix size information + extra varmode // extra size information + typ Type // type + _ byte // makes bytespec 4 bytes (yes, this matters) +} + +// size mode +// if positive, # elements for composites +type varmode int8 + +const ( + constsize varmode = 0 // constant size (size bytes + uint8(varmode) objects) + extra8 = -1 // has uint8(p[1]) extra bytes + extra16 = -2 // has be16(p[1:]) extra bytes + extra32 = -3 // has be32(p[1:]) extra bytes + map16v = -4 // use map16 + map32v = -5 // use map32 + array16v = -6 // use array16 + array32v = -7 // use array32 +) + +func getType(v byte) Type { + return sizes[v].typ +} |