38 lines
758 B
Go
38 lines
758 B
Go
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// Package limb provides the embedded Kaguya LALT lunar limb profile.
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package limb
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import (
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_ "embed"
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"sync"
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"b612.me/astro/moon/limbtable"
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)
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//go:embed kaguya_lalt.bin
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var kaguyaTable []byte
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// Profile is the decoded Kaguya lunar limb profile.
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type Profile = limbtable.Profile
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var (
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defaultOnce sync.Once
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defaultProfile *Profile
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)
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// Default returns the embedded Kaguya LALT profile, decoded on first use.
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func Default() *Profile {
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defaultOnce.Do(func() {
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profile, err := Parse(kaguyaTable)
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if err != nil {
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panic(err)
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}
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defaultProfile = profile
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})
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return defaultProfile
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}
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// Parse decodes an LLB1 profile table.
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func Parse(data []byte) (*Profile, error) { return limbtable.Parse(data) }
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const headerSize = limbtable.HeaderSize
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