diff options
Diffstat (limited to 'guix/build/utils.scm')
| -rw-r--r-- | guix/build/utils.scm | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/guix/build/utils.scm b/guix/build/utils.scm index 3beb7da67a..39e581b0fa 100644 --- a/guix/build/utils.scm +++ b/guix/build/utils.scm @@ -61,6 +61,8 @@ symbolic-link? call-with-temporary-output-file call-with-ascii-input-file + file-header-match + png-file? elf-file? ar-file? gzip-file? @@ -290,6 +292,15 @@ with the bytes in HEADER, a bytevector." #f ;FILE is a directory (apply throw args)))))) +(define %png-magic-bytes + ;; Magic bytes of PNG images, see ‘5.2 PNG signatures’ in + ;; ‘Portable Network Graphics (PNG) Specification (Second Edition)’ + ;; on <https://www.w3.org/TR/PNG/>. + #vu8(137 80 78 71 13 10 26 10)) + +(define png-file? + (file-header-match %png-magic-bytes)) + (define %elf-magic-bytes ;; Magic bytes of ELF files. See <elf.h>. (u8-list->bytevector (map char->integer (string->list "\x7FELF")))) |