106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package strfs
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import (
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"io/fs"
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"time"
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)
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// RegularFile lets you turn a string into a fs.File.
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//
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// Example usage:
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//
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// var content strfs.Content = strfs.CreateContent("<!DOCTYPE html>"+"\n"+"<html><body>Hello world!</body></html>")
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//
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// var regularfile strfs.RegularFile = strfs.RegularFile{
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// FileContent: content,
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// FileName: "helloworld.html",
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// FileModTime: time.Date(2022, 12, 12, 10, 30, 14, 2, time.UTC),
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// }
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type RegularFile struct {
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FileContent Content
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FileName string
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FileModTime time.Time
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}
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// A trick to make sure strfs.RegularFile fits the fs.File interface.
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// This is a compile-time check.
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var _ fs.File = &RegularFile{}
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// Close will stop the Read method from working.
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//
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// Close can safely be called more than once.
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//
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// Close helps strfs.RegularFile fit the fs.File interface.
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// Close makes strfs.RegularFile fit the io.Closer interface.
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func (receiver *RegularFile) Close() error {
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if nil == receiver {
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return errNilReceiver
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}
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return receiver.FileContent.Close()
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}
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// Read reads up to len(p) bytes into 'p'.
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// Read returns the number of bytes actually read, and any errors it encountered.
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//
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// Read helps strfs.RegularFile fit the fs.File interface.
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// Read makes strfs.Content fit the io.Reader interface.
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//
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// Example usage:
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//
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// var content strfs.Content = strfs.CreateContent("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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//
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// var regularfile strfs.RegularFile = strfs.RegularFile{
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// FileContent: content,
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// FileName: "alphabet.txt",
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// FileModTime: time.Now(),
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// }
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//
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// var b1 [5]byte
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// var p1 []byte = b1[:]
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//
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// n, err := regularfile.Read(p1)
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//
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// // n == 5
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// // b1 == [5]byte{'A', 'B', 'C', 'D', 'E'}
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//
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// // ...
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//
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// var b2 [4]byte
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// var p2 []byte = b2[:]
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//
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// n, err := regularfile.Read(p2)
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//
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// // n == 4
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// // b2 == [5]byte{'F', 'G', 'H', 'I'}
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func (receiver *RegularFile) Read(p []byte) (int, error) {
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if nil == receiver {
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return 0, errNilReceiver
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}
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return receiver.FileContent.Read(p)
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}
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// Stat returns a fs.FileInfo for a *strfs.RegularFile.
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//
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// Stat helps strfs.RegularFile fit the fs.File interface.
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func (receiver *RegularFile) Stat() (fs.FileInfo, error) {
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if nil == receiver {
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return nil, errNilReceiver
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}
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if EmptyContent() == receiver.FileContent {
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return nil, errEmptyContent
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}
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const modeRegularFile = 0
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return internalFileInfo{
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sys: receiver.FileContent.String(),
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name: receiver.FileName,
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size: receiver.FileContent.Size(),
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mode: modeRegularFile,
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modtime: receiver.FileModTime,
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}, nil
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}
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