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Winni Neessen
b79374224c
Updated the Reader struct in reader.go to properly handle nil buffers. This prevents potential errors from nil pointer dereference. Also added the fmt package for debugging purposes. Correspondingly, additional tests in reader_test.go were also added to cover these edge cases and ensure the Reader struct correctly handles them.
48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
// SPDX-FileCopyrightText: 2022-2023 The go-mail Authors
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//
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// SPDX-License-Identifier: MIT
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package mail
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import (
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"io"
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)
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// Reader is a type that implements the io.Reader interface for a Msg
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type Reader struct {
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buf []byte // contents are the bytes buf[off : len(buf)]
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off int // read at &buf[off], write at &buf[len(buf)]
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err error // initialization error
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}
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// Error returns an error if the Reader err field is not nil
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func (r *Reader) Error() error {
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return r.err
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}
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// Read reads the length of p of the Msg buffer to satisfy the io.Reader interface
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func (r *Reader) Read(p []byte) (n int, err error) {
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if r.err != nil {
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return 0, r.err
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}
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if r.empty() || r.buf == nil {
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r.Reset()
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if len(p) == 0 {
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return 0, nil
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}
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return 0, io.EOF
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}
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n = copy(p, r.buf[r.off:])
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r.off += n
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return n, err
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}
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// Reset resets the Reader buffer to be empty, but it retains the underlying storage
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// for use by future writes.
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func (r *Reader) Reset() {
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r.buf = r.buf[:0]
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r.off = 0
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}
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// empty reports whether the unread portion of the Reader buffer is empty.
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func (r *Reader) empty() bool { return len(r.buf) <= r.off }
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