From 15c0b25d011f37e7c20aeca9eaf461f78285b8d9 Mon Sep 17 00:00:00 2001 From: Alex Pilon Date: Fri, 22 Feb 2019 18:24:37 -0500 Subject: deps: github.com/hashicorp/terraform@sdk-v0.11-with-go-modules Updated via: go get github.com/hashicorp/terraform@sdk-v0.11-with-go-modules and go mod tidy --- vendor/github.com/ulikunitz/xz/lzma/header2.go | 398 +++++++++++++++++++++++++ 1 file changed, 398 insertions(+) create mode 100644 vendor/github.com/ulikunitz/xz/lzma/header2.go (limited to 'vendor/github.com/ulikunitz/xz/lzma/header2.go') diff --git a/vendor/github.com/ulikunitz/xz/lzma/header2.go b/vendor/github.com/ulikunitz/xz/lzma/header2.go new file mode 100644 index 0000000..ac6a71a --- /dev/null +++ b/vendor/github.com/ulikunitz/xz/lzma/header2.go @@ -0,0 +1,398 @@ +// Copyright 2014-2017 Ulrich Kunitz. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package lzma + +import ( + "errors" + "fmt" + "io" +) + +const ( + // maximum size of compressed data in a chunk + maxCompressed = 1 << 16 + // maximum size of uncompressed data in a chunk + maxUncompressed = 1 << 21 +) + +// chunkType represents the type of an LZMA2 chunk. Note that this +// value is an internal representation and no actual encoding of a LZMA2 +// chunk header. +type chunkType byte + +// Possible values for the chunk type. +const ( + // end of stream + cEOS chunkType = iota + // uncompressed; reset dictionary + cUD + // uncompressed; no reset of dictionary + cU + // LZMA compressed; no reset + cL + // LZMA compressed; reset state + cLR + // LZMA compressed; reset state; new property value + cLRN + // LZMA compressed; reset state; new property value; reset dictionary + cLRND +) + +// chunkTypeStrings provide a string representation for the chunk types. +var chunkTypeStrings = [...]string{ + cEOS: "EOS", + cU: "U", + cUD: "UD", + cL: "L", + cLR: "LR", + cLRN: "LRN", + cLRND: "LRND", +} + +// String returns a string representation of the chunk type. +func (c chunkType) String() string { + if !(cEOS <= c && c <= cLRND) { + return "unknown" + } + return chunkTypeStrings[c] +} + +// Actual encodings for the chunk types in the value. Note that the high +// uncompressed size bits are stored in the header byte additionally. +const ( + hEOS = 0 + hUD = 1 + hU = 2 + hL = 1 << 7 + hLR = 1<<7 | 1<<5 + hLRN = 1<<7 | 1<<6 + hLRND = 1<<7 | 1<<6 | 1<<5 +) + +// errHeaderByte indicates an unsupported value for the chunk header +// byte. These bytes starts the variable-length chunk header. +var errHeaderByte = errors.New("lzma: unsupported chunk header byte") + +// headerChunkType converts the header byte into a chunk type. It +// ignores the uncompressed size bits in the chunk header byte. +func headerChunkType(h byte) (c chunkType, err error) { + if h&hL == 0 { + // no compression + switch h { + case hEOS: + c = cEOS + case hUD: + c = cUD + case hU: + c = cU + default: + return 0, errHeaderByte + } + return + } + switch h & hLRND { + case hL: + c = cL + case hLR: + c = cLR + case hLRN: + c = cLRN + case hLRND: + c = cLRND + default: + return 0, errHeaderByte + } + return +} + +// uncompressedHeaderLen provides the length of an uncompressed header +const uncompressedHeaderLen = 3 + +// headerLen returns the length of the LZMA2 header for a given chunk +// type. +func headerLen(c chunkType) int { + switch c { + case cEOS: + return 1 + case cU, cUD: + return uncompressedHeaderLen + case cL, cLR: + return 5 + case cLRN, cLRND: + return 6 + } + panic(fmt.Errorf("unsupported chunk type %d", c)) +} + +// chunkHeader represents the contents of a chunk header. +type chunkHeader struct { + ctype chunkType + uncompressed uint32 + compressed uint16 + props Properties +} + +// String returns a string representation of the chunk header. +func (h *chunkHeader) String() string { + return fmt.Sprintf("%s %d %d %s", h.ctype, h.uncompressed, + h.compressed, &h.props) +} + +// UnmarshalBinary reads the content of the chunk header from the data +// slice. The slice must have the correct length. +func (h *chunkHeader) UnmarshalBinary(data []byte) error { + if len(data) == 0 { + return errors.New("no data") + } + c, err := headerChunkType(data[0]) + if err != nil { + return err + } + + n := headerLen(c) + if len(data) < n { + return errors.New("incomplete data") + } + if len(data) > n { + return errors.New("invalid data length") + } + + *h = chunkHeader{ctype: c} + if c == cEOS { + return nil + } + + h.uncompressed = uint32(uint16BE(data[1:3])) + if c <= cU { + return nil + } + h.uncompressed |= uint32(data[0]&^hLRND) << 16 + + h.compressed = uint16BE(data[3:5]) + if c <= cLR { + return nil + } + + h.props, err = PropertiesForCode(data[5]) + return err +} + +// MarshalBinary encodes the chunk header value. The function checks +// whether the content of the chunk header is correct. +func (h *chunkHeader) MarshalBinary() (data []byte, err error) { + if h.ctype > cLRND { + return nil, errors.New("invalid chunk type") + } + if err = h.props.verify(); err != nil { + return nil, err + } + + data = make([]byte, headerLen(h.ctype)) + + switch h.ctype { + case cEOS: + return data, nil + case cUD: + data[0] = hUD + case cU: + data[0] = hU + case cL: + data[0] = hL + case cLR: + data[0] = hLR + case cLRN: + data[0] = hLRN + case cLRND: + data[0] = hLRND + } + + putUint16BE(data[1:3], uint16(h.uncompressed)) + if h.ctype <= cU { + return data, nil + } + data[0] |= byte(h.uncompressed>>16) &^ hLRND + + putUint16BE(data[3:5], h.compressed) + if h.ctype <= cLR { + return data, nil + } + + data[5] = h.props.Code() + return data, nil +} + +// readChunkHeader reads the chunk header from the IO reader. +func readChunkHeader(r io.Reader) (h *chunkHeader, err error) { + p := make([]byte, 1, 6) + if _, err = io.ReadFull(r, p); err != nil { + return + } + c, err := headerChunkType(p[0]) + if err != nil { + return + } + p = p[:headerLen(c)] + if _, err = io.ReadFull(r, p[1:]); err != nil { + return + } + h = new(chunkHeader) + if err = h.UnmarshalBinary(p); err != nil { + return nil, err + } + return h, nil +} + +// uint16BE converts a big-endian uint16 representation to an uint16 +// value. +func uint16BE(p []byte) uint16 { + return uint16(p[0])<<8 | uint16(p[1]) +} + +// putUint16BE puts the big-endian uint16 presentation into the given +// slice. +func putUint16BE(p []byte, x uint16) { + p[0] = byte(x >> 8) + p[1] = byte(x) +} + +// chunkState is used to manage the state of the chunks +type chunkState byte + +// start and stop define the initial and terminating state of the chunk +// state +const ( + start chunkState = 'S' + stop = 'T' +) + +// errors for the chunk state handling +var ( + errChunkType = errors.New("lzma: unexpected chunk type") + errState = errors.New("lzma: wrong chunk state") +) + +// next transitions state based on chunk type input +func (c *chunkState) next(ctype chunkType) error { + switch *c { + // start state + case 'S': + switch ctype { + case cEOS: + *c = 'T' + case cUD: + *c = 'R' + case cLRND: + *c = 'L' + default: + return errChunkType + } + // normal LZMA mode + case 'L': + switch ctype { + case cEOS: + *c = 'T' + case cUD: + *c = 'R' + case cU: + *c = 'U' + case cL, cLR, cLRN, cLRND: + break + default: + return errChunkType + } + // reset required + case 'R': + switch ctype { + case cEOS: + *c = 'T' + case cUD, cU: + break + case cLRN, cLRND: + *c = 'L' + default: + return errChunkType + } + // uncompressed + case 'U': + switch ctype { + case cEOS: + *c = 'T' + case cUD: + *c = 'R' + case cU: + break + case cL, cLR, cLRN, cLRND: + *c = 'L' + default: + return errChunkType + } + // terminal state + case 'T': + return errChunkType + default: + return errState + } + return nil +} + +// defaultChunkType returns the default chunk type for each chunk state. +func (c chunkState) defaultChunkType() chunkType { + switch c { + case 'S': + return cLRND + case 'L', 'U': + return cL + case 'R': + return cLRN + default: + // no error + return cEOS + } +} + +// maxDictCap defines the maximum dictionary capacity supported by the +// LZMA2 dictionary capacity encoding. +const maxDictCap = 1<<32 - 1 + +// maxDictCapCode defines the maximum dictionary capacity code. +const maxDictCapCode = 40 + +// The function decodes the dictionary capacity byte, but doesn't change +// for the correct range of the given byte. +func decodeDictCap(c byte) int64 { + return (2 | int64(c)&1) << (11 + (c>>1)&0x1f) +} + +// DecodeDictCap decodes the encoded dictionary capacity. The function +// returns an error if the code is out of range. +func DecodeDictCap(c byte) (n int64, err error) { + if c >= maxDictCapCode { + if c == maxDictCapCode { + return maxDictCap, nil + } + return 0, errors.New("lzma: invalid dictionary size code") + } + return decodeDictCap(c), nil +} + +// EncodeDictCap encodes a dictionary capacity. The function returns the +// code for the capacity that is greater or equal n. If n exceeds the +// maximum support dictionary capacity, the maximum value is returned. +func EncodeDictCap(n int64) byte { + a, b := byte(0), byte(40) + for a < b { + c := a + (b-a)>>1 + m := decodeDictCap(c) + if n <= m { + if n == m { + return c + } + b = c + } else { + a = c + 1 + } + } + return a +} -- cgit v1.2.3