mirror of
https://github.com/wader/fq.git
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326 lines
11 KiB
Go
326 lines
11 KiB
Go
package zip
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// https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
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// https://opensource.apple.com/source/zip/zip-6/unzip/unzip/proginfo/extra.fld
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// TODO: zip64
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import (
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"bytes"
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"compress/flate"
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"io"
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"github.com/wader/fq/format"
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"github.com/wader/fq/format/registry"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/scalar"
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)
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var probeFormat decode.Group
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func init() {
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registry.MustRegister(decode.Format{
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Name: format.ZIP,
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Description: "ZIP archive",
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Groups: []string{format.PROBE},
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DecodeFn: zipDecode,
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Dependencies: []decode.Dependency{
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{Names: []string{format.PROBE}, Group: &probeFormat},
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},
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})
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}
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const (
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compressionMethodNone = 0
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compressionMethodShrunk = 1
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compressionMethodReducedCompressionFactor1 = 2
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compressionMethodReducedCompressionFactor2 = 3
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compressionMethodReducedCompressionFactor3 = 4
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compressionMethodReducedCompressionFactor4 = 5
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compressionMethodImploded = 6
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compressionMethodDeflated = 8
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compressionMethodEnhancedDeflated = 9
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compressionMethodPKWareDCLImploded = 10
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compressionMethodBzip2 = 12
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compressionMethodLZMA = 14
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compressionMethodIBMTERSE = 18
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compressionMethodIBMLZ77z = 19
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compressionMethodPPMd = 98
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)
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var compressionMethodMap = scalar.UToSymStr{
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compressionMethodNone: "none",
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compressionMethodShrunk: "shrunk",
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compressionMethodReducedCompressionFactor1: "reduced_compression_factor1",
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compressionMethodReducedCompressionFactor2: "reduced_compression_factor2",
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compressionMethodReducedCompressionFactor3: "reduced_compression_factor3",
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compressionMethodReducedCompressionFactor4: "reduced_compression_factor4",
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compressionMethodImploded: "imploded",
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compressionMethodDeflated: "deflated",
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compressionMethodEnhancedDeflated: "enhanced_deflated",
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compressionMethodPKWareDCLImploded: "pk_ware_dcl_imploded",
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compressionMethodBzip2: "bzip2",
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compressionMethodLZMA: "lzma",
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compressionMethodIBMTERSE: "ibmterse",
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compressionMethodIBMLZ77z: "ibmlz77z",
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compressionMethodPPMd: "pp_md",
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}
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var (
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centralDirectorySignature = []byte("PK\x01\x02")
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endOfCentralDirectorySignature = []byte("PK\x05\x06")
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endOfCentralDirectorySignatureN = 0x06054b50
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localFileSignature = []byte("PK\x03\x04")
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dataIndicatorSignature = []byte("PK\x07\x08")
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)
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var headerIDMap = scalar.UToDescription{
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0x0001: "ZIP64 extended information extra field",
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0x0007: "AV Info",
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0x0009: "OS/2 extended attributes",
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0x000a: "NTFS (Win9x/WinNT FileTimes)",
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0x000c: "OpenVMS",
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0x000d: "Unix",
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0x000f: "Patch Descriptor",
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0x0014: "PKCS#7 Store for X.509 Certificates",
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0x0015: "X.509 Certificate ID and Signature for individual file",
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0x0016: "X.509 Certificate ID for Central Directory",
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0x0065: "IBM S/390 attributes - uncompressed",
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0x0066: "IBM S/390 attributes - compressed",
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0x07c8: "Info-ZIP Macintosh (old, J. Lee)",
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0x2605: "ZipIt Macintosh (first version)",
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0x2705: "ZipIt Macintosh v 1.3.5 and newer (w/o full filename)",
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0x334d: "Info-ZIP Macintosh (new, D. Haase's 'Mac3' field )",
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0x4154: "Tandem NSK",
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0x4341: "Acorn/SparkFS (David Pilling)",
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0x4453: "Windows NT security descriptor (binary ACL)",
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0x4704: "VM/CMS",
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0x470f: "MVS",
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// "inofficial" in original table
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//nolint:misspell
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0x4854: "Theos, old inofficial port",
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0x4b46: "FWKCS MD5 (see below)",
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0x4c41: "OS/2 access control list (text ACL)",
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0x4d49: "Info-ZIP OpenVMS (obsolete)",
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0x4d63: "Macintosh SmartZIP, by Macro Bambini",
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0x4f4c: "Xceed original location extra field",
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0x5356: "AOS/VS (binary ACL)",
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0x5455: "extended timestamp",
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0x5855: "Info-ZIP Unix (original; also OS/2, NT, etc.)",
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0x554e: "Xceed unicode extra field",
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0x6542: "BeOS (BeBox, PowerMac, etc.)",
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0x6854: "Theos",
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0x756e: "ASi Unix",
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0x7855: "Info-ZIP Unix (new)",
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0x7875: "UNIX UID/GID",
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0xfb4a: "SMS/QDOS",
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}
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// "MS-DOS uses year values relative to 1980 and 2 second precision."
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func fieldMSDOSTime(d *decode.D) {
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d.FieldU5("hours")
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d.FieldU6("minutes")
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d.FieldU5("seconds")
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}
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func fieldMSDOSDate(d *decode.D) {
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d.FieldU7("year")
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d.FieldU4("month")
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d.FieldU5("day")
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}
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func zipDecode(d *decode.D, in interface{}) interface{} {
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// TODO: just decode instead?
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if !bytes.Equal(d.PeekBytes(4), []byte("PK\x03\x04")) {
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d.Errorf("expected PK header")
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}
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d.Endian = decode.LittleEndian
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d.SeekAbs(d.Len())
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// TODO: better EOCD probe
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p, _, err := d.TryPeekFind(32, -8, -10000, func(v uint64) bool {
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return v == uint64(endOfCentralDirectorySignatureN)
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})
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if err != nil {
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d.Fatalf("can't find end of central directory")
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}
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d.SeekAbs(d.Len() + p)
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var offsetCD uint64
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var sizeCD uint64
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var diskNr uint64
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d.FieldStruct("end_of_central_directory", func(d *decode.D) {
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d.FieldRawLen("signature", 4*8, d.AssertBitBuf(endOfCentralDirectorySignature))
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diskNr = d.FieldU16("disk_nr")
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d.FieldU16("central_directory_start_disk_nr")
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d.FieldU16("nr_of_central_directory_records_on_disk")
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d.FieldU16("nr_of_central_directory_records")
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sizeCD = d.FieldU32("size_of_central directory")
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offsetCD = d.FieldU32("offset_of_start_of_central_directory")
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commentLength := d.FieldU16("comment_length")
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d.FieldUTF8("comment", int(commentLength))
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})
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var localFileOffsets []uint64
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d.SeekAbs(int64(offsetCD) * 8)
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d.FieldArray("central_directories", func(d *decode.D) {
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d.FramedFn(int64(sizeCD)*8, func(d *decode.D) {
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for !d.End() {
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d.FieldStruct("central_directory", func(d *decode.D) {
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d.FieldRawLen("signature", 4*8, d.AssertBitBuf(centralDirectorySignature))
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d.FieldU16("version_made_by")
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d.FieldU16("version_needed")
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d.FieldStruct("flags", func(d *decode.D) {
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// TODO: 16LE, should have some kind of native endian flag reader helper?
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d.FieldU1("unused0")
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d.FieldBool("strong_encryption")
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d.FieldBool("compressed_patched_data")
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d.FieldBool("enhanced_deflation")
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d.FieldBool("data_descriptor")
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d.FieldBool("compression0")
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d.FieldBool("compression1")
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d.FieldBool("encrypted")
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d.FieldU2("reserved0")
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d.FieldBool("mask_header_values")
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d.FieldBool("reserved1")
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d.FieldBool("language_encoding")
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d.FieldU3("unused1")
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})
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d.FieldU16("compression_method", compressionMethodMap)
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d.FieldStruct("last_modification_date", fieldMSDOSTime)
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d.FieldStruct("last_modification_time", fieldMSDOSDate)
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d.FieldU32("crc32_uncompressed", scalar.Hex)
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d.FieldU32("compressed_size")
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d.FieldU32("uncompressed_size")
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fileNameLength := d.FieldU16("file_name_length")
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extraFieldLength := d.FieldU16("extra_field_length")
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fileCommentLength := d.FieldU16("file_comment_length")
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diskNrStart := d.FieldU16("disk_number_where_file_starts")
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d.FieldU16("internal_file_attributes")
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d.FieldU32("external_file_attributes")
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localFileOffset := d.FieldU32("relative_offset_of_local_file_header")
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d.FieldUTF8("file_name", int(fileNameLength))
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d.FieldArray("extra_fields", func(d *decode.D) {
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d.FramedFn(int64(extraFieldLength)*8, func(d *decode.D) {
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for !d.End() {
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d.FieldStruct("extra_field", func(d *decode.D) {
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d.FieldU16("header_id", headerIDMap, scalar.Hex)
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dataSize := d.FieldU16("data_size")
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d.FieldRawLen("data", int64(dataSize)*8)
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})
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}
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})
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})
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d.FieldUTF8("file_comment", int(fileCommentLength))
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if diskNrStart == diskNr {
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localFileOffsets = append(localFileOffsets, localFileOffset)
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}
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})
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}
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})
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})
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d.FieldArray("local_files", func(d *decode.D) {
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for _, o := range localFileOffsets {
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d.SeekAbs(int64(o) * 8)
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d.FieldStruct("local_file", func(d *decode.D) {
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var hasDataDescriptor bool
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d.FieldRawLen("signature", 4*8, d.AssertBitBuf(localFileSignature))
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d.FieldU16("version_needed")
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d.FieldStruct("flags", func(d *decode.D) {
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// TODO: 16LE, should have some kind of native endian flag reader helper?
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d.FieldU1("unused0")
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d.FieldBool("strong_encryption")
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d.FieldBool("compressed_patched_data")
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d.FieldBool("enhanced_deflation")
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hasDataDescriptor = d.FieldBool("data_descriptor")
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d.FieldBool("compression0")
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d.FieldBool("compression1")
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d.FieldBool("encrypted")
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d.FieldU2("reserved0")
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d.FieldBool("mask_header_values")
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d.FieldBool("reserved1")
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d.FieldBool("language_encoding")
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d.FieldU3("unused1")
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})
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compressionMethod := d.FieldU16("compression_method", compressionMethodMap)
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d.FieldStruct("last_modification_date", fieldMSDOSTime)
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d.FieldStruct("last_modification_time", fieldMSDOSDate)
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d.FieldU32("crc32_uncompressed", scalar.Hex)
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compressedSizeBytes := d.FieldU32("compressed_size")
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d.FieldU32("uncompressed_size")
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fileNameLength := d.FieldU16("file_name_length")
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extraFieldLength := d.FieldU16("extra_field_length")
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d.FieldUTF8("file_name", int(fileNameLength))
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d.FieldArray("extra_fields", func(d *decode.D) {
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d.FramedFn(int64(extraFieldLength)*8, func(d *decode.D) {
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for !d.End() {
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d.FieldStruct("extra_field", func(d *decode.D) {
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d.FieldU16("header_id", headerIDMap, scalar.Hex)
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dataSize := d.FieldU16("data_size")
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d.FieldRawLen("data", int64(dataSize)*8)
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})
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}
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})
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})
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compressedSize := int64(compressedSizeBytes) * 8
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compressedStart := d.Pos()
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compressedLimit := compressedSize
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if compressedLimit == 0 {
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compressedLimit = d.BitsLeft()
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}
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if compressionMethod == compressionMethodNone {
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d.FieldFormatOrRawLen("uncompressed", compressedSize, probeFormat, nil)
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} else {
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var rFn func(r io.Reader) io.Reader
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switch compressionMethod {
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case compressionMethodDeflated:
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// bitio.NewIOReadSeeker implements io.ByteReader so that deflate don't do own
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// buffering and might read more than needed messing up knowing compressed size
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rFn = func(r io.Reader) io.Reader { return flate.NewReader(r) }
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}
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if rFn != nil {
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readCompressedSize, uncompressedBR, dv, _, _ := d.TryFieldReaderRangeFormat("uncompressed", d.Pos(), compressedLimit, rFn, probeFormat, nil)
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if dv == nil && uncompressedBR != nil {
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d.FieldRootBitBuf("uncompressed", uncompressedBR)
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}
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if compressedSize == 0 {
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compressedSize = readCompressedSize
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}
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d.FieldRawLen("compressed", compressedSize)
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} else {
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if compressedSize != 0 {
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d.FieldRawLen("compressed", compressedSize)
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}
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}
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}
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d.SeekAbs(compressedStart + compressedSize)
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if hasDataDescriptor {
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d.FieldStruct("data_indicator", func(d *decode.D) {
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if bytes.Equal(d.PeekBytes(4), dataIndicatorSignature) {
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d.FieldRawLen("signature", 4*8, d.AssertBitBuf(dataIndicatorSignature))
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}
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d.FieldU32("crc32_uncompressed", scalar.Hex)
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d.FieldU32("compressed_size")
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d.FieldU32("uncompressed_size")
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})
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}
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})
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}
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})
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return nil
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}
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