import sys

def try_decode_scanline(data, width, max_height=2000):
    """PCX-style per-scanline RLE decode: for each row, decode exactly `width`
    pixels (excess from a run discarded), continue until input consumed.
    Returns (rows_pixels_list, bytes_consumed, ok, error_msg)."""
    i = 0
    n = len(data)
    rows = []
    row = []
    while i < n:
        if len(row) >= width:
            rows.append(row)
            row = []
            if len(rows) > max_height:
                return rows, i, False, "too many rows"
            continue
        b = data[i]
        if (b & 0xC0) == 0xC0:
            count = b & 0x3F
            i += 1
            if i >= n:
                return rows, i, False, "truncated run (missing value byte)"
            val = data[i]
            i += 1
            need = width - len(row)
            take = min(count, need)
            row.extend([val]*take)
            # NOTE: if count > need, the overshoot pixels for the *next* row
            # are DISCARDED per classic PCX semantics (not carried over)
        else:
            row.append(b)
            i += 1
    if row:
        # leftover partial row at EOF
        rows.append(row)
        return rows, i, False, f"EOF with partial row of {len(row)} px"
    return rows, i, True, "clean"

def scan_widths(data, wmin=4, wmax=250):
    results = []
    for w in range(wmin, wmax+1):
        rows, consumed, ok, msg = try_decode_scanline(data, w)
        # figure out leftover partial-row size from msg if present
        leftover = None
        if "partial row of" in msg:
            leftover = int(msg.split("partial row of")[1].split("px")[0].strip())
        elif msg == "clean":
            leftover = 0
        results.append((w, len(rows), leftover, ok, msg))
    return results

base = "/home/aria/kellogg_remake/extracted_pre/"
files = ["A.BOB","B.BOB","E.BOB","N.BOB","O.BOB","D.BOB","J.BOB"]
for fn in files:
    data = open(base+fn,"rb").read()
    print(f"=== {fn} (size={len(data)}) ===")
    results = scan_widths(data)
    clean = [r for r in results if r[2]==0]
    if clean:
        for r in clean:
            print("  CLEAN (leftover=0):", r)
    else:
        print("  no width in range gives leftover==0")