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25 lines
752 B
Python
25 lines
752 B
Python
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import png
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def get_rgba(w, h, pixels, x, y):
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“””Get RGBA pixel DWORD from x, y”””
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pos = x + y * w
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pixel = pixels[pos * 4 : (pos + 1) * 4]
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return pixel[0], pixel[1], pixel[2], pixel[3]
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def decode_pixel(w, h, pixels, x, y):
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“””Get RGBA pixel DWORD at x, y and decode to BYTE”””
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r, g, b, a = get_rgba(w, h, pixels, x, y)
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return (r & 7 | 8 * (8 * b | g & 7)) & 0xff
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# Open payload image
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w, h, pixels, metadata = png.Reader(filename=”payload.png”).read_flat()
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size = 0
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x = 0
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y = 0
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# Decode size of payload
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while x < 4:
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size = (size >> 8) | decode_pixel(w, h, pixels, x, y) << 24
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x = x + 1
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print(hex(size))
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# Decode first row
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while x < w:
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print(hex(decode_pixel(w, h, pixels, x, y)))
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x = x + 1
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