64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
/*
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©AngelaMos | 2026
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capacity.go
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The capacity command: report how much a cover can hold, per carrier
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*/
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package cli
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import (
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"bytes"
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"os"
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"github.com/CarterPerez-dev/crypha/internal/engine"
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"github.com/CarterPerez-dev/crypha/internal/report"
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"github.com/spf13/cobra"
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)
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func newCapacityCmd() *cobra.Command {
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var format, in string
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cmd := &cobra.Command{
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Use: cmdCapacity + " -i COVER [--format F]",
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Short: "Report how many bytes a cover can hide",
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Args: cobra.MaximumNArgs(1),
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RunE: func(cmd *cobra.Command, args []string) error {
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path, err := pathFromFlagOrArg(in, args)
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if err != nil {
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return err
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}
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if path == "" {
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return errNoCover
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}
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cover, err := os.ReadFile(path)
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if err != nil {
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return err
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}
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rows, err := capacityRows(format, cover)
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if err != nil {
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return err
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}
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return report.Capacity(cmd.OutOrStdout(), rows, jsonEnabled(cmd))
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},
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}
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f := cmd.Flags()
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f.StringVar(&format, flagFormat, "", "carrier format (all applicable formats if omitted)")
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f.StringVarP(&in, flagIn, shortIn, "", "cover input path (or pass as an argument)")
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return cmd
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}
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func capacityRows(format string, cover []byte) ([]engine.CapacityRow, error) {
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if format == "" {
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return engine.CapacityAll(cover), nil
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}
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if _, err := engine.ResolveCarrier(format, ""); err != nil {
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return nil, err
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}
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n, cerr := engine.Capacity(format, bytes.NewReader(cover))
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return []engine.CapacityRow{{Format: format, Capacity: n, Err: cerr}}, nil
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}
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