imports/ImHex-Patterns
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patterns/zip: Add parsing local file header with minor adjustment (#172)

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patterns/zip: add parsing local file header, and another adjustmenst

Add missing parsing for local file headers
Add compression method
Minor adjustments: removed black colors, marked magic ids
This commit is contained in:
HalfInner
2023-10-06 12:20:30 +02:00
committed by GitHub
parent 5ad8e15afc
commit 056035c540
1 changed files with 63 additions and 10 deletions
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73
patterns/zip.hexpat
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@@ -1,4 +1,4 @@
#pragma description End of Central Directory Header, Central Directory File Headers
#pragma description End of Central Directory Header, Central Directory File Headers, Local File Header
#pragma MIME application/zip
@@ -6,7 +6,7 @@
#include <std/math.pat>
struct EndOfCentralDirectory {
u32 headerSignature [[color("00000000")]];
u32 headerSignature [[comment("EoCD magic"), name("EoCD PK\\5\\6")]];
u16 diskNum [[comment("Number of this disk "), name("Disk Number")]];
u16 diskStart [[comment("Disk where central directory starts "), name("Central Directory Disk Number")]];
u16 CDRCount [[comment("Number of central directory records on this disk"), name("Central Directory Entries")]];
@@ -36,24 +36,77 @@ fn find_eocd() {
EndOfCentralDirectory fileInfo @ find_eocd() [[name("End of Central Directory Record")]];
enum CompressionMethod : u16 {
None = 0, // The file is stored (no compression)
Shrunk = 1, // The file is Shrunk
Factor1 = 2, // The file is Reduced with compression factor 1
Factor2 = 3, // The file is Reduced with compression factor 2
Factor3 = 4, // The file is Reduced with compression factor 3
Factor4 = 5, // The file is Reduced with compression factor 4
Implode = 6, // The file is Imploded
// ? = 7, // Reserved for Tokenizing compression algorithm
Deflate = 8, // The file is Deflated
Deflate64 = 9, // Enhanced Deflating using Deflate64(tm)
PKWARE = 10, // PKWARE Data Compression Library Imploding (old IBM TERSE)
// ? =11, // Reserved by PKWARE
BZIP2 = 12, // File is compressed using BZIP2 algorithm
// ? = 13, // Reserved by PKWARE
LZMA = 14, // LZMA
// ? = 15, // Reserved by PKWARE
CMPSC = 16, // IBM z/OS CMPSC Compression
// ? = 17, // Reserved by PKWARE
IBMTERSE = 18, // File is compressed using IBM TERSE (new)
LZ77 = 19, // IBM LZ77 z Architecture
_ZSTD = 20, // deprecated (use method 93 for zstd)
ZSTD = 93, // Zstandard (zstd) Compression
MP3 = 94, // MP3 Compression
XZ = 95, // XZ Compression
JPEG = 96, // JPEG variant
WavPack = 97, // WavPack compressed data
PPMd = 98, // PPMd version I, Rev 1
AE_x = 99, // AE-x encryption marker (see APPENDIX E)
};
struct LocalFileHeader {
u32 headerSignature [[name("LCF PK\\3\\4")]];
u16 version [[ comment("The minimum supported ZIP specification version needed to extract the file") ]];
u16 purposeBitflag [[ comment("General purpose bit flag") ]];
CompressionMethod compressionMethod [[ comment("Compression method") ]];
u16 lastModifyTime [[ comment("File last modification time") ]];
u16 lastModifyDate [[ comment("File last modification date") ]];
u32 crc32 [[ comment("CRC-32") ]];
u32 compressedSize [[ comment("Compressed size") ]];
u32 uncompressedSize [[ comment("Uncompressed size") ]];
u16 fileNameLength [[ comment("File name length (n)") ]];
u16 extraFieldLength [[ comment("Extra field length (m)") ]];
char fileName[fileNameLength] [[ comment("File Name") ]];
char extraField[extraFieldLength] [[ comment("Extra Field") ]];
u8 data[compressedSize] [[name("File Data")]];
};
union File {
u32 fileOffset [[comment("Offset of local file header, relative to the start of the first disk on which the file occurs.")]];
LocalFileHeader *fileHeader : u32;
};
struct CentralDirectoryFileHeader {
u32 headerSignature [[color("00000000")]];
u32 headerSignature [[name("CDFH PK\\1\\2")]];
u16 versionMade [[comment("Version file made by")]];
u16 versionExtract [[comment("Minimum version needed to extract")]];
u16 generalFlag [[comment("General purpose bit flag"), color("00000000")]];
u16 compressionMethod;
u16 generalFlag [[comment("General purpose bit flag")]];
CompressionMethod compressionMethod;
u16 fileLastModifyTime [[comment("File last modification time")]];
u16 fileLastModifyDate [[comment("File last modification date")]];
u32 crc32 [[comment("CRC-32 of uncompressed data"), color("00000000")]];
u32 crc32 [[comment("CRC-32 of uncompressed data")]];
u32 compressedSize;
u32 uncompressedSize;
u16 fileNameLength [[color("00000000")]];
u16 extraFieldLength [[color("00000000")]];
u16 fileCommentLength [[color("00000000")]];
u16 fileNameLength;
u16 extraFieldLength;
u16 fileCommentLength;
u16 diskNumber [[comment("Disk number where file starts")]];
u16 internalFileAttributes;
u32 externalFileAttributes;
u32 fileOffset [[comment("Offset of local file header, relative to the start of the first disk on which the file occurs.")]];
File file;
char fileName[fileNameLength];
u8 extraField[extraFieldLength];
char comment[fileCommentLength];