diff options
Diffstat (limited to 'Userland/Libraries/LibGfx/ICCProfile.cpp')
| -rw-r--r-- | Userland/Libraries/LibGfx/ICCProfile.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Userland/Libraries/LibGfx/ICCProfile.cpp b/Userland/Libraries/LibGfx/ICCProfile.cpp index e8a4098563..bcdb839c60 100644 --- a/Userland/Libraries/LibGfx/ICCProfile.cpp +++ b/Userland/Libraries/LibGfx/ICCProfile.cpp @@ -248,6 +248,9 @@ Optional<Crypto::Hash::MD5::DigestType> parse_profile_id(ICCHeader const& header Crypto::Hash::MD5::DigestType md5; static_assert(sizeof(md5.data) == sizeof(header.profile_md5)); memcpy(md5.data, header.profile_md5, sizeof(md5.data)); + + // FIXME: Consider comparing read id with compute_id() result and failing if they aren't equal. + return md5; } } @@ -386,4 +389,25 @@ ErrorOr<NonnullRefPtr<Profile>> Profile::try_load_from_externally_owned_memory(R return profile; } +Crypto::Hash::MD5::DigestType Profile::compute_id(ReadonlyBytes bytes) +{ + // ICC v4, 7.2.18 Profile ID field + // The Profile ID shall be calculated using the MD5 fingerprinting method as defined in Internet RFC 1321. + // The entire profile, whose length is given by the size field in the header, + // with the profile flags field (bytes 44 to 47, see 7.2.11), + // rendering intent field (bytes 64 to 67, see 7.2.15), + // and profile ID field (bytes 84 to 99) in the profile header + // temporarily set to zeros (00h), shall be used to calculate the ID. + const u8 zero[16] = {}; + Crypto::Hash::MD5 md5; + md5.update(bytes.slice(0, 44)); + md5.update(ReadonlyBytes { zero, 4 }); // profile flags field + md5.update(bytes.slice(48, 64 - 48)); + md5.update(ReadonlyBytes { zero, 4 }); // rendering intent field + md5.update(bytes.slice(68, 84 - 68)); + md5.update(ReadonlyBytes { zero, 16 }); // profile ID field + md5.update(bytes.slice(100)); + return md5.digest(); +} + } |