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.)

Re-exports

• pub use bitflags;

Structs

• Array
• BackwardsSOffset
  ForwardsSOffset is used by Follow to traverse a FlatBuffer: the pointer is incremented by the negative of the value contained in this type.
• DefaultAllocator
  Default FlatBufferBuilder allocator backed by a Vec<u8>.
• 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
• VectorIter
  An iterator over a Vector.
• Verifier
  Carries the verification state. Should not be reused between tables.
• VerifierOptions
• 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.

Enums

• ErrorTraceDetail
  Traces the location of data errors. Not populated for Dos detecting errors. Useful for MissingRequiredField and Utf8Error in particular, though the other errors should not be producible by correct flatbuffers implementations.
• InvalidFlatbuffer
  Describes how a flatuffer is invalid and, for data errors, roughly where. No extra tracing information is given for DoS detecting errors since it will probably be a lot.

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

• Allocator
  Trait to implement custom allocation strategies for FlatBufferBuilder.
• 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.
• SimpleToVerifyInSlice
• Verifiable

Functions

• array_init
• buffer_has_identifier
  Returns true if data contains a prefix of ident
• emplace_scalar^⚠
  Place an EndianScalar into the provided mutable byte slice. Performs endian conversion, if necessary.
• emplace_scalar_array^⚠
  Place an array of EndianScalar into the provided mutable byte slice. Performs endian conversion, if necessary.
• field_index_to_field_offset
• follow_cast_ref^⚠
  Safety
• 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.
• root
  Gets the root of the Flatbuffer, verifying it first with default options. Note that verification is an experimental feature and may not be maximally performant or catch every error (though that is the goal). See the _unchecked variants for previous behavior.
• root_unchecked^⚠
  Gets root for a trusted Flatbuffer.
• root_with_opts
  Gets the root of the Flatbuffer, verifying it first with given options. Note that verification is an experimental feature and may not be maximally performant or catch every error (though that is the goal). See the _unchecked variants for previous behavior.
• size_prefixed_root
  Gets the root of a size prefixed Flatbuffer, verifying it first with default options. Note that verification is an experimental feature and may not be maximally performant or catch every error (though that is the goal). See the _unchecked variants for previous behavior.
• size_prefixed_root_unchecked^⚠
  Gets root for a trusted, size prefixed, Flatbuffer.
• size_prefixed_root_with_opts
  Gets the root of a size prefixed Flatbuffer, verifying it first with given options. Note that verification is an experimental feature and may not be maximally performant or catch every error (though that is the goal). See the _unchecked variants for previous behavior.

Type Aliases

• SOffsetT
  SOffsetT is a relative pointer from tables to their vtables.
• UOffsetT
  UOffsetT is used represent both for relative pointers and lengths of vectors.
• VOffsetT
  VOffsetT is a relative pointer in vtables to point from tables to field data.