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LibGfx: Extract all_bytes_are_zero() function in ICCProfile

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Nico Weber 2023-01-06 12:05:53 -05:00 • committed by Linus Groh
parent aa107ef2d6
commit 090bd02a88
1 changed files with 11 additions and 5 deletions
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16
Userland/Libraries/LibGfx/ICCProfile.cpp
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@ -234,15 +234,21 @@ ErrorOr<XYZ> parse_pcs_illuminant(ICCHeader const& header)
return xyz; return xyz;
} }
template<size_t N>
bool all_bytes_are_zero(const u8 (&bytes)[N])
{
for (u8 byte : bytes) {
if (byte != 0)
return false;
}
return true;
}
Optional<Crypto::Hash::MD5::DigestType> parse_profile_id(ICCHeader const& header) Optional<Crypto::Hash::MD5::DigestType> parse_profile_id(ICCHeader const& header)
{ {
// ICC v4, 7.2.18 Profile ID field // ICC v4, 7.2.18 Profile ID field
// "A profile ID field value of zero (00h) shall indicate that a profile ID has not been calculated." // "A profile ID field value of zero (00h) shall indicate that a profile ID has not been calculated."
bool did_calculate_profile_id = false; if (all_bytes_are_zero(header.profile_id))
for (u8 b : header.profile_id)
if (b != 0)
did_calculate_profile_id = true;
if (!did_calculate_profile_id)
return {}; return {};
Crypto::Hash::MD5::DigestType md5; Crypto::Hash::MD5::DigestType md5;