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01adad62b2
message.Part now has a ReaderUTF8OrBinary() along with the existing Reader(). the new function returns a reader of decoded content. we now use it in a few places, including search. we only support the charsets in golang.org/x/text/encoding/ianaindex. search has also been changed to not read the entire message in memory. instead, we make one 8k buffer for reading and search in that, and we keep the buffer around for all messages. saves quite some allocations when searching large mailboxes.
27 lines
693 B
Go
27 lines
693 B
Go
package moxio
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import (
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"io"
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"strings"
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"golang.org/x/text/encoding/ianaindex"
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)
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// DecodeReader returns a reader that reads from r, decoding as charset. If
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// charset is empty, us-ascii, utf-8 or unknown, the original reader is
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// returned and no decoding takes place.
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func DecodeReader(charset string, r io.Reader) io.Reader {
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switch strings.ToLower(charset) {
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case "", "us-ascii", "utf-8":
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return r
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}
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enc, _ := ianaindex.MIME.Encoding(charset)
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if enc == nil {
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enc, _ = ianaindex.IANA.Encoding(charset)
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}
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// todo: ianaindex doesn't know all encodings, e.g. gb2312. should we transform them, with which code?
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if enc == nil {
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return r
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}
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return enc.NewDecoder().Reader(r)
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}
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