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LibGfx: Implement serialization of MultiLocalizedUnicodeTagData

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Nico Weber 2023-02-17 20:29:50 -05:00 • committed by Andreas Kling
parent 4a62cf35fc
commit eb6dccb675
1 changed files with 51 additions and 1 deletions
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52
Userland/Libraries/LibGfx/ICC/BinaryWriter.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Utf16View.h>
#include <LibGfx/ICC/BinaryFormat.h>
#include <LibGfx/ICC/BinaryWriter.h>
#include <LibGfx/ICC/Profile.h>
@ -13,9 +14,58 @@
namespace Gfx::ICC {
static ErrorOr<ByteBuffer> encode_multi_localized_unicode(MultiLocalizedUnicodeTagData const& tag_data)
{
// ICC v4, 10.15 multiLocalizedUnicodeType
// "The Unicode strings in storage should be encoded as 16-bit big-endian, UTF-16BE,
// and should not be NULL terminated."
size_t number_of_records = tag_data.records().size();
size_t header_and_record_size = 4 * sizeof(u32) + number_of_records * sizeof(MultiLocalizedUnicodeRawRecord);
size_t number_of_codepoints = 0;
Vector<Utf16Data> utf16_strings;
TRY(utf16_strings.try_ensure_capacity(number_of_records));
for (auto const& record : tag_data.records()) {
TRY(utf16_strings.try_append(TRY(utf8_to_utf16(record.text))));
number_of_codepoints += utf16_strings.last().size();
}
size_t string_table_size = number_of_codepoints * sizeof(u16);
auto bytes = TRY(ByteBuffer::create_uninitialized(header_and_record_size + string_table_size));
auto* header = bit_cast<BigEndian<u32>*>(bytes.data());
header[0] = (u32)MultiLocalizedUnicodeTagData::Type;
header[1] = 0;
header[2] = number_of_records;
header[3] = sizeof(MultiLocalizedUnicodeRawRecord);
size_t offset = header_and_record_size;
auto* records = bit_cast<MultiLocalizedUnicodeRawRecord*>(bytes.data() + 16);
for (size_t i = 0; i < number_of_records; ++i) {
records[i].language_code = tag_data.records()[i].iso_639_1_language_code;
records[i].country_code = tag_data.records()[i].iso_3166_1_country_code;
records[i].string_length_in_bytes = utf16_strings[i].size() * sizeof(u16);
records[i].string_offset_in_bytes = offset;
offset += records[i].string_offset_in_bytes;
}
auto* string_table = bit_cast<BigEndian<u16>*>(bytes.data() + header_and_record_size);
for (auto const& utf16_string : utf16_strings) {
for (size_t i = 0; i < utf16_string.size(); ++i)
string_table[i] = utf16_string[i];
string_table += utf16_string.size();
}
return bytes;
}
static ErrorOr<ByteBuffer> encode_tag_data(TagData const& tag_data)
{
(void)tag_data;
switch (tag_data.type()) {
case MultiLocalizedUnicodeTagData::Type:
return encode_multi_localized_unicode(static_cast<MultiLocalizedUnicodeTagData const&>(tag_data));
}
return ByteBuffer {};
}