#!/bin/zsh
# 分块并行下载 Ghidra（GitHub release 单连接只有 ~150KB/s，多连接能快很多）。
set -e

URL="https://github.com/NationalSecurityAgency/ghidra/releases/download/Ghidra_12.1.4_build/ghidra_12.1.4_PUBLIC_20260921.zip"
TOTAL=569649598
PARTS=8
HERE="$(cd "$(dirname "$0")" && pwd)"
OUT="$HERE/ghidra.zip"
CHUNK=$(( (TOTAL + PARTS - 1) / PARTS ))

for index in $(seq 0 $((PARTS - 1))); do
  start=$(( index * CHUNK ))
  end=$(( start + CHUNK - 1 ))
  (( end >= TOTAL )) && end=$(( TOTAL - 1 ))
  part="$HERE/.ghidra.part$index"
  have=0
  [[ -f "$part" ]] && have=$(stat -f%z "$part")
  want=$(( end - start + 1 ))
  if (( have >= want )); then
    echo "part$index 已完成 ($have)"
    continue
  fi
  echo "part$index -> $(( have )) / $want"
  curl -sL --max-time 1800 -r $(( start + have ))-$end -o "$part" "$URL" &
done
wait

echo "拼接"
: > "$OUT"
for index in $(seq 0 $((PARTS - 1))); do
  cat "$HERE/.ghidra.part$index" >> "$OUT"
done
ls -la "$OUT"