PSP Ram Searcher

SIZE_THRESHOLD = 0x80000   #How big a block you want to find (at minimum)
#1   KiB = 0x400
#512 KiB = 0x80000
#1   MiB = 0x100000
with open('ram.dump', 'rb') as f:
    filedata = f.read()
l = []
pos = 0
while pos < len(filedata):
    num = 0
    basepos = filedata.find(b'\x00', pos + 1)
    pos = basepos
    if pos == -1:
        break
    while filedata[pos] == 0 and pos < len(filedata):
        pos += 1
    if pos - basepos > SIZE_THRESHOLD:
        l.append((hex(basepos), pos - basepos))
for pos, size in l:
    print(pos, size)