magic bytes
Methodology
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Change magic bytes as per extension required.
Magic Bytes
# 16
PNG: 89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52
# 6
GIF:
GIF87a: 47 49 46 38 37 61
GIF89a: 47 49 46 38 39 61
# 4
JPEG: ff d8 ff e0
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