mirror of
https://github.com/WerWolv/ImHex-Patterns.git
synced 2026-03-28 07:47:02 -05:00
63 lines
3.1 KiB
Rust
63 lines
3.1 KiB
Rust
#pragma description End of Central Directory Header, Central Directory File Headers
|
|
|
|
#pragma MIME application/zip
|
|
|
|
#include <std/mem.pat>
|
|
#include <std/math.pat>
|
|
|
|
struct EndOfCentralDirectory {
|
|
u32 headerSignature [[color("00000000")]];
|
|
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")]];
|
|
u16 CentralDirectoryRecordCount [[comment("Total number of entries in the central directory"), name("Total Central Directory Entries")]];
|
|
u32 CDSize [[comment("Size of central directory (bytes)"), name("Central Directory Size")]];
|
|
u32 CDOffset [[comment("Offset of start of central directory, relative to start of archive"), name("Central Directory Offset")]];
|
|
u16 commentLength [[color("00000000")]];
|
|
char coment[commentLength] [[name("Comment")]];
|
|
};
|
|
|
|
fn find_eocd() {
|
|
// If there is no zip comment, which is the common case,
|
|
// the end-of-central-directory record will be 22 bytes long
|
|
// at the end of the file; check if size-22 has the signature.
|
|
if (std::mem::read_unsigned(std::mem::size()-22, 4, std::mem::Endian::Little) == 0x06054B50) {
|
|
return std::mem::size()-22;
|
|
} else {
|
|
// If it's not there, then there's probably a zip comment;
|
|
// search the last 64KB of the file for the signature.
|
|
// This is not entirely reliable, since the signature could
|
|
// randomly appear in compressed data before the actual EOCD,
|
|
// but it should be good enough...
|
|
u128 last64k = std::math::max(0, std::mem::size()-65536-22);
|
|
return std::mem::find_sequence_in_range(0, last64k, std::mem::size(), 0x50,0x4B,0x05,0x06);
|
|
}
|
|
};
|
|
|
|
EndOfCentralDirectory fileInfo @ find_eocd() [[name("End of Central Directory Record")]];
|
|
|
|
struct CentralDirectoryFileHeader {
|
|
u32 headerSignature [[color("00000000")]];
|
|
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 fileLastModifyTime [[comment("File last modification time")]];
|
|
u16 fileLastModifyDate [[comment("File last modification date")]];
|
|
u32 crc32 [[comment("CRC-32 of uncompressed data"), color("00000000")]];
|
|
u32 compressedSize;
|
|
u32 uncompressedSize;
|
|
u16 fileNameLength [[color("00000000")]];
|
|
u16 extraFieldLength [[color("00000000")]];
|
|
u16 fileCommentLength [[color("00000000")]];
|
|
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.")]];
|
|
char fileName[fileNameLength];
|
|
u8 extraField[extraFieldLength];
|
|
char comment[fileCommentLength];
|
|
};
|
|
|
|
CentralDirectoryFileHeader centralDirHeaders[fileInfo.CDRCount] @ (fileInfo.CDOffset) [[name("Files")]];
|