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Add XZStreamHeader struct

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This commit is contained in:
Timofey Solomko
2017-10-31 19:51:42 +03:00
parent 7b99272bea
commit b006cb9718
2 changed files with 57 additions and 0 deletions
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SWCompression.xcodeproj/project.pbxproj
+10
View File
@@ -160,6 +160,10 @@
064F722C1F1E638A00017297 /* 7zError.swift in Sources */ = {isa = PBXBuildFile; fileRef = 064F72281F1E638A00017297 /* 7zError.swift */; };
064F722F1F1E63D800017297 /* test1.7z in Resources */ = {isa = PBXBuildFile; fileRef = 064F722E1F1E63D800017297 /* test1.7z */; };
064F72311F1E63E200017297 /* 7zTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 064F72301F1E63E200017297 /* 7zTests.swift */; };
0651461E1FA8E004007F83F4 /* XZStreamHeader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0651461D1FA8E004007F83F4 /* XZStreamHeader.swift */; };
0651461F1FA8E004007F83F4 /* XZStreamHeader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0651461D1FA8E004007F83F4 /* XZStreamHeader.swift */; };
065146201FA8E004007F83F4 /* XZStreamHeader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0651461D1FA8E004007F83F4 /* XZStreamHeader.swift */; };
065146211FA8E004007F83F4 /* XZStreamHeader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0651461D1FA8E004007F83F4 /* XZStreamHeader.swift */; };
0651FEC21F8E2E9100C49646 /* ContainerEntryType+Tar.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0651FEC11F8E2E9100C49646 /* ContainerEntryType+Tar.swift */; };
0651FEC31F8E2E9100C49646 /* ContainerEntryType+Tar.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0651FEC11F8E2E9100C49646 /* ContainerEntryType+Tar.swift */; };
0651FEC41F8E2E9100C49646 /* ContainerEntryType+Tar.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0651FEC11F8E2E9100C49646 /* ContainerEntryType+Tar.swift */; };
@@ -520,6 +524,7 @@
064F72281F1E638A00017297 /* 7zError.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = 7zError.swift; sourceTree = "<group>"; };
064F722E1F1E63D800017297 /* test1.7z */ = {isa = PBXFileReference; lastKnownFileType = file; path = test1.7z; sourceTree = "<group>"; };
064F72301F1E63E200017297 /* 7zTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = 7zTests.swift; sourceTree = "<group>"; };
0651461D1FA8E004007F83F4 /* XZStreamHeader.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = XZStreamHeader.swift; sourceTree = "<group>"; };
0651FEC11F8E2E9100C49646 /* ContainerEntryType+Tar.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ContainerEntryType+Tar.swift"; sourceTree = "<group>"; };
0655693F1DC659FF00A47E66 /* SWCompression.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SWCompression.framework; sourceTree = BUILT_PRODUCTS_DIR; };
0655694C1DC65A8000A47E66 /* SWCompression.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SWCompression.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -810,6 +815,7 @@
children = (
06E2346B1E068E9600F18798 /* XZArchive.swift */,
061C06201F0E89D900832F0C /* XZError.swift */,
0651461D1FA8E004007F83F4 /* XZStreamHeader.swift */,
06CC3FE11F8AAF3100BD576D /* DataWithPointer+XZ.swift */,
);
path = XZ;
@@ -1494,6 +1500,7 @@
06CC3FE31F8AAF3100BD576D /* DataWithPointer+XZ.swift in Sources */,
065D0ADD1F2B9D9100CE2DA8 /* 7zEntryInfo.swift in Sources */,
06F276E01F2BAB4A00E67335 /* 7zEntry.swift in Sources */,
0651461F1FA8E004007F83F4 /* XZStreamHeader.swift in Sources */,
06E2346D1E068E9600F18798 /* XZArchive.swift in Sources */,
06CDFC9F1F111D2600292758 /* Deflate+Compress.swift in Sources */,
0620F4AF1F8E246E001C9B7A /* Container.swift in Sources */,
@@ -1586,6 +1593,7 @@
06CC3FE41F8AAF3100BD576D /* DataWithPointer+XZ.swift in Sources */,
065D0ADE1F2B9D9100CE2DA8 /* 7zEntryInfo.swift in Sources */,
06F276E11F2BAB4A00E67335 /* 7zEntry.swift in Sources */,
065146201FA8E004007F83F4 /* XZStreamHeader.swift in Sources */,
06E2346E1E068E9600F18798 /* XZArchive.swift in Sources */,
06CDFCA01F111D2600292758 /* Deflate+Compress.swift in Sources */,
0620F4B01F8E246E001C9B7A /* Container.swift in Sources */,
@@ -1678,6 +1686,7 @@
06CC3FE51F8AAF3100BD576D /* DataWithPointer+XZ.swift in Sources */,
065D0ADF1F2B9D9100CE2DA8 /* 7zEntryInfo.swift in Sources */,
06F276E21F2BAB4A00E67335 /* 7zEntry.swift in Sources */,
065146211FA8E004007F83F4 /* XZStreamHeader.swift in Sources */,
06E2346F1E068E9600F18798 /* XZArchive.swift in Sources */,
06CDFCA11F111D2600292758 /* Deflate+Compress.swift in Sources */,
0620F4B11F8E246E001C9B7A /* Container.swift in Sources */,
@@ -1770,6 +1779,7 @@
06CC3FE21F8AAF3100BD576D /* DataWithPointer+XZ.swift in Sources */,
065D0ADC1F2B9D9100CE2DA8 /* 7zEntryInfo.swift in Sources */,
06F276DF1F2BAB4A00E67335 /* 7zEntry.swift in Sources */,
0651461E1FA8E004007F83F4 /* XZStreamHeader.swift in Sources */,
06E2346C1E068E9600F18798 /* XZArchive.swift in Sources */,
06CDFC9E1F111D2600292758 /* Deflate+Compress.swift in Sources */,
0620F4AE1F8E246E001C9B7A /* Container.swift in Sources */,
Sources/XZ/XZStreamHeader.swift
+47
View File
@@ -0,0 +1,47 @@
// Copyright (c) 2017 Timofey Solomko
// Licensed under MIT License
//
// See LICENSE for license information
import Foundation
struct XZStreamHeader {
enum CheckType: UInt8 {
case none = 0x00
case crc32 = 0x01
case crc64 = 0x04
case sha256 = 0x0A
}
let checkType: CheckType
let flagsCRC: UInt32
init(_ pointerData: DataWithPointer) throws {
// Check magic number.
guard pointerData.bytes(count: 6) == [0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00]
else { throw XZError.wrongMagic }
let flagsBytes = pointerData.bytes(count: 2)
// First, we need to check for corruption in flags,
// so we compare CRC32 of flags to the value stored in archive.
let flagsCRC = pointerData.uint32()
guard CheckSums.crc32(flagsBytes) == flagsCRC
else { throw XZError.wrongInfoCRC }
self.flagsCRC = flagsCRC
// If data is not corrupted, then some bits must be equal to zero.
guard flagsBytes[0] == 0 && flagsBytes[1] & 0xF0 == 0
else { throw XZError.fieldReservedValue }
// Four bits of second flags byte indicate type of redundancy check.
if let checkType = CheckType(rawValue: flagsBytes[1] & 0xF) {
self.checkType = checkType
} else {
throw XZError.fieldReservedValue
}
}
}