fix offset when reading and writing fat32 files to avoid overruns #503

	name: Continuous Integration
	on:
	pull_request:
	types: [opened, synchronize, reopened]
	push:
	branches:
	- master

	jobs:
	report:
	name: Report
	runs-on: ubuntu-latest
	steps:
	- name: ref
	run: echo ${{ github.ref }}
	- name: event_name
	run: echo ${{ github.event_name }}
	build:
	name: Build
	strategy:
	matrix:
	target: [
	# Tier 1
	{arch: amd64, os: linux}, {arch: arm64, os: linux},
	{arch: amd64, os: windows}, {arch: arm64, os: windows},
	{arch: amd64, os: darwin}, {arch: arm64, os: darwin},
	{arch: wasm, os: wasip1},

	# Tier 2 (Best effort)
	{arch: amd64, os: freebsd}, {arch: arm64, os: freebsd},
	{arch: amd64, os: netbsd}, {arch: arm64, os: netbsd},
	{arch: amd64, os: openbsd}, {arch: arm64, os: openbsd},
	{arch: amd64, os: solaris},
	{arch: amd64, os: illumos},
	{arch: ppc64, os: aix},
	]
	runs-on: ubuntu-latest
	steps:
	- name: checkout
	uses: actions/checkout@v2
	- uses: actions/setup-go@v5
	with:
	go-version-file: 'go.mod'
	- run: go build
	env:
	GOOS: ${{ matrix.target.os }}
	GOARCH: ${{ matrix.target.arch }}
	test:
	name: Test
	strategy:
	matrix:
	os: [macos-latest, windows-latest, ubuntu-latest]
	runs-on: ${{ matrix.os }}
	steps:
	- name: checkout
	uses: actions/checkout@v2
	- uses: actions/setup-go@v2
	with:
	go-version: ^1.21
	- run: go build
	- name: vet
	if: matrix.os != 'windows-latest'
	run: make vet
	- name: lint
	if: matrix.os != 'windows-latest'
	run: make lint
	- name: image
	if: matrix.os == 'ubuntu-latest'
	run: make image
	- name: test
	if: matrix.os == 'ubuntu-latest'
	run: make test

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