[][src]Crate flatbuffers

FlatBuffers

A library for memory-efficient serialization of data.

This crate provides runtime support for the FlatBuffers format in the Rust programming language. To use this crate, first generate code with the flatc compiler, as described here: https://google.github.io/flatbuffers/ Then, include that code into your project. Finally, add this crate to your Cargo.toml.

At this time, Rust support is experimental, and APIs may change between minor versions.

At this time, to generate Rust code, you will need the latest master version of flatc, available from here: https://github.com/google/flatbuffers (On OSX, you can install FlatBuffers from HEAD with the Homebrew package manager.)

Structs

BackwardsSOffset

ForwardsSOffset is used by Follow to traverse a FlatBuffer: the pointer is incremented by the negative of the value contained in this type.

FileIdentifier

FileIdentifier is used by Follow to traverse a FlatBuffer: the pointer is dereferenced into a byte slice, whose bytes are the file identifer value.

FlatBufferBuilder

FlatBufferBuilder builds a FlatBuffer through manipulating its internal state. It has an owned Vec<u8> that grows as needed (up to the hardcoded limit of 2GiB, which is set by the FlatBuffers format).

FollowStart

FollowStart wraps a Follow impl in a struct type. This can make certain programming patterns more ergonomic.

ForwardsUOffset

ForwardsUOffset is used by Follow to traverse a FlatBuffer: the pointer is incremented by the value contained in this type.

ForwardsVOffset

ForwardsVOffset is used by Follow to traverse a FlatBuffer: the pointer is incremented by the value contained in this type.

SkipFileIdentifier

SkipFileIdentifier is used by Follow to traverse a FlatBuffer: the pointer is incremented by a fixed constant in order to skip over the file identifier value.

SkipRootOffset

SkipRootOffset is used by Follow to traverse a FlatBuffer: the pointer is incremented by a fixed constant in order to skip over the root offset value.

SkipSizePrefix

SkipSizePrefix is used by Follow to traverse a FlatBuffer: the pointer is incremented by a fixed constant in order to skip over the size prefix value.

Table
TableFinishedWIPOffset

TableFinishedWIPOffset marks a WIPOffset as being for a finished table.

TableUnfinishedWIPOffset

TableUnfinishedWIPOffset marks a WIPOffset as being for an unfinished table.

UnionWIPOffset

UnionWIPOffset marks a WIPOffset as being for a union value.

VTableWIPOffset

VTableWIPOffset marks a WIPOffset as being for a vtable.

Vector
WIPOffset

WIPOffset contains an UOffsetT with a special meaning: it is the location of data relative to the end of an in-progress FlatBuffer. The FlatBufferBuilder uses this to track the location of objects in an absolute way. The impl of Push converts a WIPOffset into a ForwardsUOffset.

Constants

FILE_IDENTIFIER_LENGTH
FLATBUFFERS_MAX_BUFFER_SIZE
SIZE_F32
SIZE_F64
SIZE_I8
SIZE_I16
SIZE_I32
SIZE_I64
SIZE_SIZEPREFIX
SIZE_SOFFSET
SIZE_U8
SIZE_U16
SIZE_U32
SIZE_U64
SIZE_UOFFSET
SIZE_VOFFSET
VTABLE_METADATA_FIELDS

Traits

EndianScalar

Trait for values that must be stored in little-endian byte order, but might be represented in memory as big-endian. Every type that implements EndianScalar is a valid FlatBuffers scalar value.

Follow

Follow is a trait that allows us to access FlatBuffers in a declarative, type safe, and fast way. They compile down to almost no code (after optimizations). Conceptually, Follow lifts the offset-based access patterns of FlatBuffers data into the type system. This trait is used pervasively at read time, to access tables, vtables, vectors, strings, and all other data. At this time, Follow is not utilized much on the write path.

Push

Trait to abstract over functionality needed to write values (either owned or referenced). Used in FlatBufferBuilder and implemented for generated types.

SafeSliceAccess

Functions

buffer_has_identifier
byte_swap_f32

Swaps the bytes of an f32.

byte_swap_f64

Swaps the bytes of an f64.

emplace_scalar

Place an EndianScalar into the provided mutable byte slice. Performs endian conversion, if necessary.

field_index_to_field_offset
follow_cast_ref
get_root
get_size_prefixed_root
read_scalar

Read an EndianScalar from the provided byte slice. Performs endian conversion, if necessary.

read_scalar_at

Read an EndianScalar from the provided byte slice at the specified location. Performs endian conversion, if necessary.

Type Definitions

SOffsetT

SOffsetT is an i32 that is used by tables to reference their vtables.

UOffsetT

UOffsetT is a u32 that is used by pervasively to represent both pointers and lengths of vectors.

VOffsetT

VOffsetT is a i32 that is used by vtables to store field data.