Module header 

NSIS header structures.

This module contains parsers for the three header layers:

• FirstHeader: The 28-byte signature and size block found in the PE overlay.
• BlockHeader: An 8-byte descriptor (offset + count) for each data block.
• CommonHeader: The main header containing flags, block descriptors, callbacks, and install configuration.

Structure Chain

PE Overlay
└─ FirstHeader (28 bytes, usually at a 512-byte aligned offset)
   └─ Compressed Header Block
      └─ CommonHeader
         ├─ BlockHeader[0] → Pages
         ├─ BlockHeader[1] → Sections
         ├─ BlockHeader[2] → Entries
         ├─ BlockHeader[3] → Strings
         ├─ BlockHeader[4] → LangTables
         ├─ BlockHeader[5] → CtlColors
         ├─ BlockHeader[6] → BgFont
         └─ BlockHeader[7] → Data

Re-exports

pub use blockheader::BLOCKS_NUM;

pub use blockheader::BlockHeader;

pub use blockheader::BlockType;

pub use commonheader::CommonHeader;

pub use firstheader::FirstHeader;

Modules

blockheader

NSIS block header structure.

commonheader

NSIS common header structure.

firstheader

NSIS FirstHeader structure.

Enums

NsisVersionHint

Hint about which NSIS version produced an installer.

Functions

scan_for_first_header

Scans the overlay for a valid NSIS FirstHeader.