[Issue 15949] Improve readtext handling of byte order mark (BOM)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15949

--- Comment #2 from github-bugzilla at puremagic.com ---
Commits pushed to master at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/5d52a81e4dede77fe75eb3215f1b24b898963f26
Fix issue 15949: Make readText check BOMs.

This makes it so that readText checks for a BOM. If there is a BOM, it
is for UTF-8, UTF-16, or UTF-32, and it doesn't match the requested
string type, then a UTFException is thrown. Other encodings are let
through in case they happen to work with the requested string type and
pass UTF validation.

Also, this makes it so that readText checks the alignment of the buffer
against the requested string type and throws a UTFException instead of
letting the cast throw an Error.

https://github.com/dlang/phobos/commit/d43925ec6048f49b56c9f4b0cc22ed07999f63a1
Merge pull request #6113 from jmdavis/issue15949

Fix issue 15949: Make readText check BOMs.
merged-on-behalf-of: Vladimir Panteleev <github at thecybershadow.net>

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