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• Mach-o-reader

Read-mach_header

Parse Mach-O header

Signature

(read-mach_header file-header) → header

Arguments

file-header — Guard (byte-listp file-header).

Returns

header — Type (mach-o-header-p header).

Definitions and Theorems

Function: read-mach_header

(defun read-mach_header (file-header)
 (declare (xargs :guard (byte-listp file-header)))
 (let ((__function__ 'read-mach_header))
  (declare (ignorable __function__))
  (b*
   (((unless (or (= (len file-header) 28)
                 (= (len file-header) 32)))
     (prog2$
      (raise
       "Mach-O header's length should be either 28 or 32, but it is ~x0 instead!"
       (len file-header))
      (make-mach-o-header)))
    ((mv magic file-header)
     (merge-first-split-bytes 4 file-header))
    ((mv cputype file-header)
     (merge-first-split-bytes 4 file-header))
    ((mv cpusubtype file-header)
     (merge-first-split-bytes 4 file-header))
    ((mv filetype file-header)
     (merge-first-split-bytes 4 file-header))
    ((mv ncmds file-header)
     (merge-first-split-bytes 4 file-header))
    ((mv sizeofcmds file-header)
     (merge-first-split-bytes 4 file-header))
    ((mv flags file-header)
     (merge-first-split-bytes 4 file-header))
    ((mv reserved ?file-header)
     (if (or (equal magic *mh_magic_64*)
             (equal magic *mh_cigam_64*))
         (merge-first-split-bytes 4 file-header)
       (mv nil file-header))))
   (make-mach-o-header :magic magic
                       :cputype cputype
                       :cpusubtype cpusubtype
                       :filetype filetype
                       :ncmds ncmds
                       :sizeofcmds sizeofcmds
                       :flags flags
                       :reserved reserved))))

Theorem: mach-o-header-p-of-read-mach_header

(defthm mach-o-header-p-of-read-mach_header
  (b* ((header (read-mach_header file-header)))
    (mach-o-header-p header))
  :rule-classes :rewrite)