# Dimensionless Loading##  MiscWe're given a PNG with the width and height fields set to 0. However, the original CRC is intact. The CRC is a unique value used to check for the integrity of the preceeding chunk, similar to a hash funciton. Because of this, we can 'crack' the original dimensions with this:```pyfrom zlib import crc32 from pwn import p32 target = 0x5b8af030 header = "49 48 44 52 00 00 00 99 00 00 00 99 08 06 00 00 00".replace(' ', '').decode('hex') def check_size(w,h, header): 	w = p32(w)[::-1] 	h = p32(h)[::-1] header = header.replace("\x00\x00\x00\x99" + "\x00\x00\x00\x99", w+h) 	if crc32(header) == target: 		print(list(w),list(h)) for x in range(2000): 			for y in range(2000): 				check_size(x,y,header)```Sizes are: 				0x00 0x00 0x05 0x62 0x00 0x00 0x01 0x6BAdding this back to the image, we get the original image, containing the flag.[IMAGE HERE]
# `ractf{m1ss1ng_n0_1s_r34l!!}`