289b30715d
This commit converts the dependency management from Godeps to the vendor folder, also switching the tool from godep to trash. Since the upstream tool lacks a few features proposed via a few PRs, until those PRs are merged in (if), use github.com/karalabe/trash. You can update dependencies via trash --update. All dependencies have been updated to their latest version. Parts of the build system are reworked to drop old notions of Godeps and invocation of the go vet command so that it doesn't run against the vendor folder, as that will just blow up during vetting. The conversion drops OpenCL (and hence GPU mining support) from ethash and our codebase. The short reasoning is that there's noone to maintain and having opencl libs in our deps messes up builds as go install ./... tries to build them, failing with unsatisfied link errors for the C OpenCL deps. golang.org/x/net/context is not vendored in. We expect it to be fetched by the user (i.e. using go get). To keep ci.go builds reproducible the package is "vendored" in build/_vendor.
83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package unicode
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import (
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"golang.org/x/text/transform"
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)
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// BOMOverride returns a new decoder transformer that is identical to fallback,
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// except that the presence of a Byte Order Mark at the start of the input
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// causes it to switch to the corresponding Unicode decoding. It will only
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// consider BOMs for UTF-8, UTF-16BE, and UTF-16LE.
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//
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// This differs from using ExpectBOM by allowing a BOM to switch to UTF-8, not
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// just UTF-16 variants, and allowing falling back to any encoding scheme.
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//
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// This technique is recommended by the W3C for use in HTML 5: "For
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// compatibility with deployed content, the byte order mark (also known as BOM)
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// is considered more authoritative than anything else."
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// http://www.w3.org/TR/encoding/#specification-hooks
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//
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// Using BOMOverride is mostly intended for use cases where the first characters
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// of a fallback encoding are known to not be a BOM, for example, for valid HTML
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// and most encodings.
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func BOMOverride(fallback transform.Transformer) transform.Transformer {
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// TODO: possibly allow a variadic argument of unicode encodings to allow
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// specifying details of which fallbacks are supported as well as
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// specifying the details of the implementations. This would also allow for
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// support for UTF-32, which should not be supported by default.
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return &bomOverride{fallback: fallback}
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}
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type bomOverride struct {
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fallback transform.Transformer
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current transform.Transformer
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}
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func (d *bomOverride) Reset() {
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d.current = nil
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d.fallback.Reset()
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}
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var (
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// TODO: we could use decode functions here, instead of allocating a new
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// decoder on every NewDecoder as IgnoreBOM decoders can be stateless.
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utf16le = UTF16(LittleEndian, IgnoreBOM)
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utf16be = UTF16(BigEndian, IgnoreBOM)
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)
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const utf8BOM = "\ufeff"
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func (d *bomOverride) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
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if d.current != nil {
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return d.current.Transform(dst, src, atEOF)
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}
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if len(src) < 3 && !atEOF {
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return 0, 0, transform.ErrShortSrc
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}
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d.current = d.fallback
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bomSize := 0
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if len(src) >= 2 {
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if src[0] == 0xFF && src[1] == 0xFE {
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d.current = utf16le.NewDecoder()
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bomSize = 2
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} else if src[0] == 0xFE && src[1] == 0xFF {
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d.current = utf16be.NewDecoder()
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bomSize = 2
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} else if len(src) >= 3 &&
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src[0] == utf8BOM[0] &&
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src[1] == utf8BOM[1] &&
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src[2] == utf8BOM[2] {
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d.current = transform.Nop
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bomSize = 3
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}
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}
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if bomSize < len(src) {
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nDst, nSrc, err = d.current.Transform(dst, src[bomSize:], atEOF)
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}
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return nDst, nSrc + bomSize, err
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}
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