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LibGfx: Add ICCProfile support for textType

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This is used in v2 profiles for the required 'cprt' tag.
This commit is contained in:
Nico Weber 2023-01-21 20:50:20 -05:00 • committed by Linus Groh
parent d33eef14a0
commit 3dfb012a1a
2 changed files with 70 additions and 5 deletions
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50
Userland/Libraries/LibGfx/ICCProfile.cpp
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@ -532,6 +532,48 @@ DeviceAttributes::DeviceAttributes(u64 bits)
{
}
static TagTypeSignature tag_type(ReadonlyBytes tag_bytes)
{
VERIFY(tag_bytes.size() >= sizeof(u32));
return *bit_cast<BigEndian<TagTypeSignature> const*>(tag_bytes.data());
}
static ErrorOr<void> check_reserved(ReadonlyBytes tag_bytes)
{
if (tag_bytes.size() < 2 * sizeof(u32))
return Error::from_string_literal("ICC::Profile: Not enough data for tag reserved field");
if (*bit_cast<BigEndian<u32> const*>(tag_bytes.data() + sizeof(u32)) != 0)
return Error::from_string_literal("ICC::Profile: tag reserved field not 0");
return {};
}
ErrorOr<NonnullRefPtr<TextTagData>> TextTagData::from_bytes(ReadonlyBytes bytes, u32 offset, u32 size)
{
// ICC v4, 10.24 textType
VERIFY(tag_type(bytes) == TextTagData::Type);
TRY(check_reserved(bytes));
// "The textType is a simple text structure that contains a 7-bit ASCII text string. The length of the string is obtained
// by subtracting 8 from the element size portion of the tag itself. This string shall be terminated with a 00h byte."
u32 length = bytes.size() - 8;
u8 const* text_data = bytes.data() + 8;
for (u32 i = 0; i < length; ++i) {
if (text_data[i] >= 128)
return Error::from_string_literal("ICC::Profile: textType data not 7-byte ASCII");
}
if (length == 0)
return Error::from_string_literal("ICC::Profile: textType too short for \\0 byte");
if (text_data[length - 1] != '\0')
return Error::from_string_literal("ICC::Profile: textType data not \\0-terminated");
return adopt_ref(*new TextTagData(offset, size, TRY(String::from_utf8(StringView(text_data, length - 1)))));
}
ErrorOr<void> Profile::read_header(ReadonlyBytes bytes)
{
if (bytes.size() < sizeof(ICCHeader))
@ -574,12 +616,14 @@ ErrorOr<NonnullRefPtr<TagData>> Profile::read_tag(ReadonlyBytes bytes, Detail::T
// what kind of data is contained within a tag."
if (tag_bytes.size() < sizeof(u32))
return Error::from_string_literal("ICC::Profile: Not enough data for tag type");
auto tag_type = *bit_cast<BigEndian<TagTypeSignature> const*>(tag_bytes.data());
switch ((u32)(TagTypeSignature)tag_type) {
auto type = tag_type(tag_bytes);
switch (type) {
case TextTagData::Type:
return TextTagData::from_bytes(tag_bytes, entry.offset_to_beginning_of_tag_data_element, entry.size_of_tag_data_element);
default:
// FIXME: optionally ignore tags of unknown type
return adopt_ref(*new UnknownTagData(entry.offset_to_beginning_of_tag_data_element, entry.size_of_tag_data_element, tag_type));
return adopt_ref(*new UnknownTagData(entry.offset_to_beginning_of_tag_data_element, entry.size_of_tag_data_element, type));
}
}