705 lines
22 KiB
Rust
705 lines
22 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use core::prelude::*;
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// Simple Extensible Binary Markup Language (ebml) reader and writer on a
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// cursor model. See the specification here:
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// http://www.matroska.org/technical/specs/rfc/index.html
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// Common data structures
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struct EbmlTag {
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id: uint,
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size: uint,
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}
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struct EbmlState {
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ebml_tag: EbmlTag,
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tag_pos: uint,
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data_pos: uint,
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}
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pub struct Doc {
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data: @~[u8],
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start: uint,
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end: uint,
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}
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pub struct TaggedDoc {
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tag: uint,
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doc: Doc,
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}
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pub enum EbmlEncoderTag {
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EsUint, EsU64, EsU32, EsU16, EsU8,
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EsInt, EsI64, EsI32, EsI16, EsI8,
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EsBool,
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EsStr,
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EsF64, EsF32, EsFloat,
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EsEnum, EsEnumVid, EsEnumBody,
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EsVec, EsVecLen, EsVecElt,
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EsOpaque,
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EsLabel // Used only when debugging
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}
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// --------------------------------------
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pub mod reader {
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use ebml::{Doc, EbmlEncoderTag, EsBool, EsEnum, EsEnumBody, EsEnumVid};
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use ebml::{EsF32, EsF64, EsFloat, EsI16, EsI32, EsI64, EsI8, EsInt};
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use ebml::{EsLabel, EsOpaque, EsStr, EsU16, EsU32, EsU64, EsU8, EsUint};
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use ebml::{EsVec, EsVecElt, EsVecLen, TaggedDoc};
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use serialize;
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use core::int;
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use core::io;
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use core::ops;
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use core::prelude::*;
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use core::str;
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use core::vec;
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// ebml reading
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impl ops::Index<uint,Doc> for Doc {
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pure fn index(&self, tag: uint) -> Doc {
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unsafe {
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get_doc(*self, tag)
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}
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}
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}
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struct Res {
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val: uint,
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next: uint
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}
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fn vuint_at(data: &[u8], start: uint) -> Res {
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let a = data[start];
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if a & 0x80u8 != 0u8 {
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return Res {val: (a & 0x7fu8) as uint, next: start + 1u};
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}
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if a & 0x40u8 != 0u8 {
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return Res {val: ((a & 0x3fu8) as uint) << 8u |
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(data[start + 1u] as uint),
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next: start + 2u};
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} else if a & 0x20u8 != 0u8 {
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return Res {val: ((a & 0x1fu8) as uint) << 16u |
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(data[start + 1u] as uint) << 8u |
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(data[start + 2u] as uint),
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next: start + 3u};
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} else if a & 0x10u8 != 0u8 {
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return Res {val: ((a & 0x0fu8) as uint) << 24u |
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(data[start + 1u] as uint) << 16u |
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(data[start + 2u] as uint) << 8u |
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(data[start + 3u] as uint),
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next: start + 4u};
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} else { error!("vint too big"); fail!(); }
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}
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pub fn Doc(data: @~[u8]) -> Doc {
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Doc { data: data, start: 0u, end: vec::len::<u8>(*data) }
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}
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pub fn doc_at(data: @~[u8], start: uint) -> TaggedDoc {
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let elt_tag = vuint_at(*data, start);
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let elt_size = vuint_at(*data, elt_tag.next);
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let end = elt_size.next + elt_size.val;
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TaggedDoc {
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tag: elt_tag.val,
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doc: Doc { data: data, start: elt_size.next, end: end }
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}
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}
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pub fn maybe_get_doc(d: Doc, tg: uint) -> Option<Doc> {
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let mut pos = d.start;
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while pos < d.end {
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let elt_tag = vuint_at(*d.data, pos);
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let elt_size = vuint_at(*d.data, elt_tag.next);
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pos = elt_size.next + elt_size.val;
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if elt_tag.val == tg {
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return Some(Doc { data: d.data, start: elt_size.next,
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end: pos });
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}
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}
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None
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}
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pub fn get_doc(d: Doc, tg: uint) -> Doc {
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match maybe_get_doc(d, tg) {
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Some(d) => d,
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None => {
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error!("failed to find block with tag %u", tg);
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fail!();
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}
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}
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}
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pub fn docs(d: Doc, it: fn(uint, Doc) -> bool) {
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let mut pos = d.start;
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while pos < d.end {
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let elt_tag = vuint_at(*d.data, pos);
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let elt_size = vuint_at(*d.data, elt_tag.next);
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pos = elt_size.next + elt_size.val;
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let doc = Doc { data: d.data, start: elt_size.next, end: pos };
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if !it(elt_tag.val, doc) {
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break;
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}
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}
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}
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pub fn tagged_docs(d: Doc, tg: uint, it: fn(Doc) -> bool) {
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let mut pos = d.start;
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while pos < d.end {
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let elt_tag = vuint_at(*d.data, pos);
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let elt_size = vuint_at(*d.data, elt_tag.next);
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pos = elt_size.next + elt_size.val;
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if elt_tag.val == tg {
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let doc = Doc { data: d.data, start: elt_size.next,
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end: pos };
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if !it(doc) {
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break;
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}
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}
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}
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}
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pub fn doc_data(d: Doc) -> ~[u8] {
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vec::slice::<u8>(*d.data, d.start, d.end).to_vec()
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}
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pub fn with_doc_data<T>(d: Doc, f: fn(x: &[u8]) -> T) -> T {
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f(vec::slice(*d.data, d.start, d.end))
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}
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pub fn doc_as_str(d: Doc) -> ~str { str::from_bytes(doc_data(d)) }
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pub fn doc_as_u8(d: Doc) -> u8 {
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assert d.end == d.start + 1u;
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(*d.data)[d.start]
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}
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pub fn doc_as_u16(d: Doc) -> u16 {
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assert d.end == d.start + 2u;
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io::u64_from_be_bytes(*d.data, d.start, 2u) as u16
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}
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pub fn doc_as_u32(d: Doc) -> u32 {
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assert d.end == d.start + 4u;
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io::u64_from_be_bytes(*d.data, d.start, 4u) as u32
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}
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pub fn doc_as_u64(d: Doc) -> u64 {
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assert d.end == d.start + 8u;
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io::u64_from_be_bytes(*d.data, d.start, 8u)
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}
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pub fn doc_as_i8(d: Doc) -> i8 { doc_as_u8(d) as i8 }
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pub fn doc_as_i16(d: Doc) -> i16 { doc_as_u16(d) as i16 }
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pub fn doc_as_i32(d: Doc) -> i32 { doc_as_u32(d) as i32 }
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pub fn doc_as_i64(d: Doc) -> i64 { doc_as_u64(d) as i64 }
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pub struct Decoder {
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priv mut parent: Doc,
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priv mut pos: uint,
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}
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pub fn Decoder(d: Doc) -> Decoder {
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Decoder { parent: d, pos: d.start }
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}
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priv impl Decoder {
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fn _check_label(lbl: &str) {
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if self.pos < self.parent.end {
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let TaggedDoc { tag: r_tag, doc: r_doc } =
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doc_at(self.parent.data, self.pos);
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if r_tag == (EsLabel as uint) {
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self.pos = r_doc.end;
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let str = doc_as_str(r_doc);
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if lbl != str {
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fail!(fmt!("Expected label %s but found %s", lbl,
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str));
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}
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}
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}
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}
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fn next_doc(exp_tag: EbmlEncoderTag) -> Doc {
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debug!(". next_doc(exp_tag=%?)", exp_tag);
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if self.pos >= self.parent.end {
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fail!(~"no more documents in current node!");
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}
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let TaggedDoc { tag: r_tag, doc: r_doc } =
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doc_at(self.parent.data, self.pos);
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debug!("self.parent=%?-%? self.pos=%? r_tag=%? r_doc=%?-%?",
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copy self.parent.start, copy self.parent.end,
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copy self.pos, r_tag, r_doc.start, r_doc.end);
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if r_tag != (exp_tag as uint) {
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fail!(fmt!("expected EBML doc with tag %? but found tag %?",
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exp_tag, r_tag));
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}
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if r_doc.end > self.parent.end {
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fail!(fmt!("invalid EBML, child extends to 0x%x, \
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parent to 0x%x", r_doc.end, self.parent.end));
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}
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self.pos = r_doc.end;
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r_doc
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}
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fn push_doc<T>(d: Doc, f: fn() -> T) -> T {
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let old_parent = self.parent;
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let old_pos = self.pos;
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self.parent = d;
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self.pos = d.start;
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let r = f();
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self.parent = old_parent;
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self.pos = old_pos;
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r
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}
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fn _next_uint(exp_tag: EbmlEncoderTag) -> uint {
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let r = doc_as_u32(self.next_doc(exp_tag));
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debug!("_next_uint exp_tag=%? result=%?", exp_tag, r);
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r as uint
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}
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}
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pub impl Decoder {
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fn read_opaque<R>(&self, op: fn(Doc) -> R) -> R {
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do self.push_doc(self.next_doc(EsOpaque)) {
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op(copy self.parent)
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}
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}
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}
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impl serialize::Decoder for Decoder {
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fn read_nil(&self) -> () { () }
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fn read_u64(&self) -> u64 { doc_as_u64(self.next_doc(EsU64)) }
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fn read_u32(&self) -> u32 { doc_as_u32(self.next_doc(EsU32)) }
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fn read_u16(&self) -> u16 { doc_as_u16(self.next_doc(EsU16)) }
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fn read_u8 (&self) -> u8 { doc_as_u8 (self.next_doc(EsU8 )) }
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fn read_uint(&self) -> uint {
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let v = doc_as_u64(self.next_doc(EsUint));
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if v > (::core::uint::max_value as u64) {
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fail!(fmt!("uint %? too large for this architecture", v));
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}
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v as uint
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}
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fn read_i64(&self) -> i64 { doc_as_u64(self.next_doc(EsI64)) as i64 }
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fn read_i32(&self) -> i32 { doc_as_u32(self.next_doc(EsI32)) as i32 }
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fn read_i16(&self) -> i16 { doc_as_u16(self.next_doc(EsI16)) as i16 }
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fn read_i8 (&self) -> i8 { doc_as_u8 (self.next_doc(EsI8 )) as i8 }
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fn read_int(&self) -> int {
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let v = doc_as_u64(self.next_doc(EsInt)) as i64;
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if v > (int::max_value as i64) || v < (int::min_value as i64) {
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fail!(fmt!("int %? out of range for this architecture", v));
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}
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v as int
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}
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fn read_bool(&self) -> bool { doc_as_u8(self.next_doc(EsBool))
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as bool }
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fn read_f64(&self) -> f64 { fail!(~"read_f64()"); }
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fn read_f32(&self) -> f32 { fail!(~"read_f32()"); }
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fn read_float(&self) -> float { fail!(~"read_float()"); }
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fn read_char(&self) -> char { fail!(~"read_char()"); }
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fn read_owned_str(&self) -> ~str { doc_as_str(self.next_doc(EsStr)) }
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fn read_managed_str(&self) -> @str { fail!(~"read_managed_str()"); }
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// Compound types:
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fn read_owned<T>(&self, f: fn() -> T) -> T {
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debug!("read_owned()");
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f()
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}
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fn read_managed<T>(&self, f: fn() -> T) -> T {
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debug!("read_managed()");
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f()
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}
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fn read_enum<T>(&self, name: &str, f: fn() -> T) -> T {
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debug!("read_enum(%s)", name);
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self._check_label(name);
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self.push_doc(self.next_doc(EsEnum), f)
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}
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fn read_enum_variant<T>(&self, f: fn(uint) -> T) -> T {
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debug!("read_enum_variant()");
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let idx = self._next_uint(EsEnumVid);
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debug!(" idx=%u", idx);
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do self.push_doc(self.next_doc(EsEnumBody)) {
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f(idx)
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}
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}
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fn read_enum_variant_arg<T>(&self, idx: uint, f: fn() -> T) -> T {
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debug!("read_enum_variant_arg(idx=%u)", idx);
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f()
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}
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fn read_owned_vec<T>(&self, f: fn(uint) -> T) -> T {
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debug!("read_owned_vec()");
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do self.push_doc(self.next_doc(EsVec)) {
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let len = self._next_uint(EsVecLen);
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debug!(" len=%u", len);
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f(len)
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}
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}
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fn read_managed_vec<T>(&self, f: fn(uint) -> T) -> T {
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debug!("read_managed_vec()");
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do self.push_doc(self.next_doc(EsVec)) {
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let len = self._next_uint(EsVecLen);
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debug!(" len=%u", len);
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f(len)
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}
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}
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fn read_vec_elt<T>(&self, idx: uint, f: fn() -> T) -> T {
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debug!("read_vec_elt(idx=%u)", idx);
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self.push_doc(self.next_doc(EsVecElt), f)
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}
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fn read_rec<T>(&self, f: fn() -> T) -> T {
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debug!("read_rec()");
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f()
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}
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fn read_struct<T>(&self, name: &str, _len: uint, f: fn() -> T) -> T {
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debug!("read_struct(name=%s)", name);
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f()
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}
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fn read_field<T>(&self, name: &str, idx: uint, f: fn() -> T) -> T {
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debug!("read_field(name=%s, idx=%u)", name, idx);
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self._check_label(name);
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f()
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}
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fn read_tup<T>(&self, len: uint, f: fn() -> T) -> T {
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debug!("read_tup(len=%u)", len);
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f()
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}
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fn read_tup_elt<T>(&self, idx: uint, f: fn() -> T) -> T {
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debug!("read_tup_elt(idx=%u)", idx);
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f()
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}
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}
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}
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pub mod writer {
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use ebml::{Doc, EbmlEncoderTag, EsBool, EsEnum, EsEnumBody, EsEnumVid};
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use ebml::{EsF32, EsF64, EsFloat, EsI16, EsI32, EsI64, EsI8, EsInt};
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use ebml::{EsLabel, EsOpaque, EsStr, EsU16, EsU32, EsU64, EsU8, EsUint};
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use ebml::{EsVec, EsVecElt, EsVecLen, TaggedDoc};
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use core::io;
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use core::str;
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use core::vec;
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// ebml writing
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pub struct Encoder {
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writer: io::Writer,
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priv mut size_positions: ~[uint],
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}
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fn write_sized_vuint(w: io::Writer, n: uint, size: uint) {
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match size {
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1u => w.write(&[0x80u8 | (n as u8)]),
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2u => w.write(&[0x40u8 | ((n >> 8_u) as u8), n as u8]),
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3u => w.write(&[0x20u8 | ((n >> 16_u) as u8), (n >> 8_u) as u8,
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n as u8]),
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4u => w.write(&[0x10u8 | ((n >> 24_u) as u8), (n >> 16_u) as u8,
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(n >> 8_u) as u8, n as u8]),
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_ => fail!(fmt!("vint to write too big: %?", n))
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};
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}
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fn write_vuint(w: io::Writer, n: uint) {
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if n < 0x7f_u { write_sized_vuint(w, n, 1u); return; }
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if n < 0x4000_u { write_sized_vuint(w, n, 2u); return; }
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if n < 0x200000_u { write_sized_vuint(w, n, 3u); return; }
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if n < 0x10000000_u { write_sized_vuint(w, n, 4u); return; }
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fail!(fmt!("vint to write too big: %?", n));
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}
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pub fn Encoder(w: io::Writer) -> Encoder {
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let size_positions: ~[uint] = ~[];
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Encoder { writer: w, mut size_positions: size_positions }
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}
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// FIXME (#2741): Provide a function to write the standard ebml header.
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pub impl Encoder {
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fn start_tag(tag_id: uint) {
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debug!("Start tag %u", tag_id);
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// Write the enum ID:
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write_vuint(self.writer, tag_id);
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// Write a placeholder four-byte size.
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self.size_positions.push(self.writer.tell());
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let zeroes: &[u8] = &[0u8, 0u8, 0u8, 0u8];
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self.writer.write(zeroes);
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}
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fn end_tag() {
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let last_size_pos = self.size_positions.pop();
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let cur_pos = self.writer.tell();
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self.writer.seek(last_size_pos as int, io::SeekSet);
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let size = (cur_pos - last_size_pos - 4u);
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|
write_sized_vuint(self.writer, size, 4u);
|
|
self.writer.seek(cur_pos as int, io::SeekSet);
|
|
|
|
debug!("End tag (size = %u)", size);
|
|
}
|
|
|
|
fn wr_tag(tag_id: uint, blk: fn()) {
|
|
self.start_tag(tag_id);
|
|
blk();
|
|
self.end_tag();
|
|
}
|
|
|
|
fn wr_tagged_bytes(tag_id: uint, b: &[u8]) {
|
|
write_vuint(self.writer, tag_id);
|
|
write_vuint(self.writer, vec::len(b));
|
|
self.writer.write(b);
|
|
}
|
|
|
|
fn wr_tagged_u64(tag_id: uint, v: u64) {
|
|
do io::u64_to_be_bytes(v, 8u) |v| {
|
|
self.wr_tagged_bytes(tag_id, v);
|
|
}
|
|
}
|
|
|
|
fn wr_tagged_u32(tag_id: uint, v: u32) {
|
|
do io::u64_to_be_bytes(v as u64, 4u) |v| {
|
|
self.wr_tagged_bytes(tag_id, v);
|
|
}
|
|
}
|
|
|
|
fn wr_tagged_u16(tag_id: uint, v: u16) {
|
|
do io::u64_to_be_bytes(v as u64, 2u) |v| {
|
|
self.wr_tagged_bytes(tag_id, v);
|
|
}
|
|
}
|
|
|
|
fn wr_tagged_u8(tag_id: uint, v: u8) {
|
|
self.wr_tagged_bytes(tag_id, &[v]);
|
|
}
|
|
|
|
fn wr_tagged_i64(tag_id: uint, v: i64) {
|
|
do io::u64_to_be_bytes(v as u64, 8u) |v| {
|
|
self.wr_tagged_bytes(tag_id, v);
|
|
}
|
|
}
|
|
|
|
fn wr_tagged_i32(tag_id: uint, v: i32) {
|
|
do io::u64_to_be_bytes(v as u64, 4u) |v| {
|
|
self.wr_tagged_bytes(tag_id, v);
|
|
}
|
|
}
|
|
|
|
fn wr_tagged_i16(tag_id: uint, v: i16) {
|
|
do io::u64_to_be_bytes(v as u64, 2u) |v| {
|
|
self.wr_tagged_bytes(tag_id, v);
|
|
}
|
|
}
|
|
|
|
fn wr_tagged_i8(tag_id: uint, v: i8) {
|
|
self.wr_tagged_bytes(tag_id, &[v as u8]);
|
|
}
|
|
|
|
fn wr_tagged_str(tag_id: uint, v: &str) {
|
|
str::byte_slice(v, |b| self.wr_tagged_bytes(tag_id, b));
|
|
}
|
|
|
|
fn wr_bytes(b: &[u8]) {
|
|
debug!("Write %u bytes", vec::len(b));
|
|
self.writer.write(b);
|
|
}
|
|
|
|
fn wr_str(s: &str) {
|
|
debug!("Write str: %?", s);
|
|
self.writer.write(str::to_bytes(s));
|
|
}
|
|
}
|
|
|
|
// FIXME (#2743): optionally perform "relaxations" on end_tag to more
|
|
// efficiently encode sizes; this is a fixed point iteration
|
|
|
|
// Set to true to generate more debugging in EBML code.
|
|
// Totally lame approach.
|
|
const debug: bool = false;
|
|
|
|
priv impl Encoder {
|
|
// used internally to emit things like the vector length and so on
|
|
fn _emit_tagged_uint(t: EbmlEncoderTag, v: uint) {
|
|
assert v <= 0xFFFF_FFFF_u;
|
|
self.wr_tagged_u32(t as uint, v as u32);
|
|
}
|
|
|
|
fn _emit_label(label: &str) {
|
|
// There are various strings that we have access to, such as
|
|
// the name of a record field, which do not actually appear in
|
|
// the encoded EBML (normally). This is just for
|
|
// efficiency. When debugging, though, we can emit such
|
|
// labels and then they will be checked by decoder to
|
|
// try and check failures more quickly.
|
|
if debug { self.wr_tagged_str(EsLabel as uint, label) }
|
|
}
|
|
}
|
|
|
|
pub impl Encoder {
|
|
fn emit_opaque(&self, f: fn()) {
|
|
do self.wr_tag(EsOpaque as uint) {
|
|
f()
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ::serialize::Encoder for Encoder {
|
|
fn emit_nil(&self) {}
|
|
|
|
fn emit_uint(&self, v: uint) {
|
|
self.wr_tagged_u64(EsUint as uint, v as u64);
|
|
}
|
|
fn emit_u64(&self, v: u64) { self.wr_tagged_u64(EsU64 as uint, v); }
|
|
fn emit_u32(&self, v: u32) { self.wr_tagged_u32(EsU32 as uint, v); }
|
|
fn emit_u16(&self, v: u16) { self.wr_tagged_u16(EsU16 as uint, v); }
|
|
fn emit_u8(&self, v: u8) { self.wr_tagged_u8 (EsU8 as uint, v); }
|
|
|
|
fn emit_int(&self, v: int) {
|
|
self.wr_tagged_i64(EsInt as uint, v as i64);
|
|
}
|
|
fn emit_i64(&self, v: i64) { self.wr_tagged_i64(EsI64 as uint, v); }
|
|
fn emit_i32(&self, v: i32) { self.wr_tagged_i32(EsI32 as uint, v); }
|
|
fn emit_i16(&self, v: i16) { self.wr_tagged_i16(EsI16 as uint, v); }
|
|
fn emit_i8(&self, v: i8) { self.wr_tagged_i8 (EsI8 as uint, v); }
|
|
|
|
fn emit_bool(&self, v: bool) {
|
|
self.wr_tagged_u8(EsBool as uint, v as u8)
|
|
}
|
|
|
|
// FIXME (#2742): implement these
|
|
fn emit_f64(&self, _v: f64) {
|
|
fail!(~"Unimplemented: serializing an f64");
|
|
}
|
|
fn emit_f32(&self, _v: f32) {
|
|
fail!(~"Unimplemented: serializing an f32");
|
|
}
|
|
fn emit_float(&self, _v: float) {
|
|
fail!(~"Unimplemented: serializing a float");
|
|
}
|
|
|
|
fn emit_char(&self, _v: char) {
|
|
fail!(~"Unimplemented: serializing a char");
|
|
}
|
|
|
|
fn emit_borrowed_str(&self, v: &str) {
|
|
self.wr_tagged_str(EsStr as uint, v)
|
|
}
|
|
|
|
fn emit_owned_str(&self, v: &str) {
|
|
self.emit_borrowed_str(v)
|
|
}
|
|
|
|
fn emit_managed_str(&self, v: &str) {
|
|
self.emit_borrowed_str(v)
|
|
}
|
|
|
|
fn emit_borrowed(&self, f: fn()) { f() }
|
|
fn emit_owned(&self, f: fn()) { f() }
|
|
fn emit_managed(&self, f: fn()) { f() }
|
|
|
|
fn emit_enum(&self, name: &str, f: fn()) {
|
|
self._emit_label(name);
|
|
self.wr_tag(EsEnum as uint, f)
|
|
}
|
|
fn emit_enum_variant(&self, _v_name: &str, v_id: uint, _cnt: uint,
|
|
f: fn()) {
|
|
self._emit_tagged_uint(EsEnumVid, v_id);
|
|
self.wr_tag(EsEnumBody as uint, f)
|
|
}
|
|
fn emit_enum_variant_arg(&self, _idx: uint, f: fn()) { f() }
|
|
|
|
fn emit_borrowed_vec(&self, len: uint, f: fn()) {
|
|
do self.wr_tag(EsVec as uint) {
|
|
self._emit_tagged_uint(EsVecLen, len);
|
|
f()
|
|
}
|
|
}
|
|
|
|
fn emit_owned_vec(&self, len: uint, f: fn()) {
|
|
self.emit_borrowed_vec(len, f)
|
|
}
|
|
|
|
fn emit_managed_vec(&self, len: uint, f: fn()) {
|
|
self.emit_borrowed_vec(len, f)
|
|
}
|
|
|
|
fn emit_vec_elt(&self, _idx: uint, f: fn()) {
|
|
self.wr_tag(EsVecElt as uint, f)
|
|
}
|
|
|
|
fn emit_rec(&self, f: fn()) { f() }
|
|
fn emit_struct(&self, _name: &str, _len: uint, f: fn()) { f() }
|
|
fn emit_field(&self, name: &str, _idx: uint, f: fn()) {
|
|
self._emit_label(name);
|
|
f()
|
|
}
|
|
|
|
fn emit_tup(&self, _len: uint, f: fn()) { f() }
|
|
fn emit_tup_elt(&self, _idx: uint, f: fn()) { f() }
|
|
}
|
|
|
|
}
|
|
// ___________________________________________________________________________
|
|
// Testing
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use ebml::reader;
|
|
use ebml::writer;
|
|
use serialize::Encodable;
|
|
use serialize;
|
|
|
|
use core::io;
|
|
use core::option::{None, Option, Some};
|
|
|
|
#[test]
|
|
fn test_option_int() {
|
|
fn test_v(v: Option<int>) {
|
|
debug!("v == %?", v);
|
|
let bytes = do io::with_bytes_writer |wr| {
|
|
let ebml_w = writer::Encoder(wr);
|
|
v.encode(&ebml_w)
|
|
};
|
|
let ebml_doc = reader::Doc(@bytes);
|
|
let deser = reader::Decoder(ebml_doc);
|
|
let v1 = serialize::Decodable::decode(&deser);
|
|
debug!("v1 == %?", v1);
|
|
assert v == v1;
|
|
}
|
|
|
|
test_v(Some(22));
|
|
test_v(None);
|
|
test_v(Some(3));
|
|
}
|
|
}
|