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LibCore+file: Factorize code to detect mime-type from bytes of a file

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This is always nice to factorize code, but even better when it contains
magic numbers.
This commit is contained in:
Lucas CHOLLET 2023-04-26 19:21:46 -04:00 • committed by Andreas Kling
parent 309a15e2aa
commit 50b5528746
3 changed files with 18 additions and 4 deletions
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16
Userland/Libraries/LibCore/MimeData.cpp
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@ -6,6 +6,7 @@
#include <AK/LexicalPath.h>
#include <AK/StringBuilder.h>
#include <LibCore/File.h>
#include <LibCore/MimeData.h>
namespace Core {
@ -184,4 +185,19 @@ Optional<DeprecatedString> guess_mime_type_based_on_sniffed_bytes(ReadonlyBytes
#undef __ENUMERATE_MIME_TYPE_HEADER
return {};
}
Optional<DeprecatedString> guess_mime_type_based_on_sniffed_bytes(Core::File& file)
{
// Read accounts for longest possible offset + signature we currently match against (extra/iso-9660)
auto maybe_buffer = ByteBuffer::create_uninitialized(0x9006);
if (maybe_buffer.is_error())
return {};
auto maybe_bytes = file.read_some(maybe_buffer.value());
if (maybe_bytes.is_error())
return {};
return Core::guess_mime_type_based_on_sniffed_bytes(maybe_bytes.value());
}
}