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23 lines
696 B
Bash
Executable File
23 lines
696 B
Bash
Executable File
#!/usr/bin/env bash
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#
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# Copyright (C) 2022 Ing <https://github.com/wjz304>
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#
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# This is free software, licensed under the MIT License.
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# See /LICENSE for more information.
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#
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read_u8() {
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dd if="${1}" bs=1 skip="$((${2}))" count=1 2>/dev/null | od -An -tu1 | grep -Eo '[0-9]+'
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}
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read_u32() {
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dd if="${1}" bs=1 skip="$((${2}))" count=4 2>/dev/null | od -An -tu4 | grep -Eo '[0-9]+'
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}
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set -x
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setup_size=$(read_u8 "${1}" 0x1f1)
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payload_offset=$(read_u32 "${1}" 0x248)
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payload_length=$(read_u32 "${1}" 0x24c)
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inner_pos=$(((setup_size + 1) * 512))
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tail -c+$((inner_pos + 1)) "${1}" | tail -c+$((payload_offset + 1)) | head -c "${payload_length}" | head -c $((payload_length - 4)) | unlzma >"${2}"
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