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Support/PathV2: Implement get_magic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123544 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -455,9 +455,11 @@ error_code has_magic(const Twine &path, const Twine &magic, bool &result);
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/// @param path Input path.
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/// @param len Number of magic bytes to get.
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/// @param result Set to the first \a len bytes in the file pointed to by
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/// \a path.
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/// @results errc::success if result has been successfully set, otherwise a
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/// platform specific error_code.
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/// \a path. Or the entire file if file_size(path) < len, in which
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/// case result.size() returns the size of the file.
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/// @results errc::success if result has been successfully set,
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/// errc::value_too_large if len is larger then the file pointed to by
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/// \a path, otherwise a platform specific error_code.
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error_code get_magic(const Twine &path, uint32_t len,
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SmallVectorImpl<char> &result);
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