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/*
* Copyright (c) 2022, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Endian.h>
#include <LibGfx/ICCProfile.h>
#include <time.h>
// V2 spec: https://color.org/specification/ICC.1-2001-04.pdf
// V4 spec: https://color.org/specification/ICC.1-2022-05.pdf
namespace Gfx::ICC {
namespace {
// ICC V4, 4.2 dateTimeNumber
// "All the dateTimeNumber values in a profile shall be in Coordinated Universal Time [...]."
struct DateTimeNumber {
BigEndian<u16> year;
BigEndian<u16> month;
BigEndian<u16> day;
BigEndian<u16> hour;
BigEndian<u16> minutes;
BigEndian<u16> seconds;
};
ErrorOr<time_t> parse_date_time_number(DateTimeNumber const& date_time)
{
// ICC V4, 4.2 dateTimeNumber
// "Number of the month (1 to 12)"
if (date_time.month < 1 || date_time.month > 12)
return Error::from_string_literal("ICC::Profile: dateTimeNumber month out of bounds");
// "Number of the day of the month (1 to 31)"
if (date_time.day < 1 || date_time.day > 31)
return Error::from_string_literal("ICC::Profile: dateTimeNumber day out of bounds");
// "Number of hours (0 to 23)"
if (date_time.hour > 23)
return Error::from_string_literal("ICC::Profile: dateTimeNumber hour out of bounds");
// "Number of minutes (0 to 59)"
if (date_time.minutes > 59)
return Error::from_string_literal("ICC::Profile: dateTimeNumber minutes out of bounds");
// "Number of seconds (0 to 59)"
// ICC profiles apparently can't be created during leap seconds (seconds would be 60 there, but the spec doesn't allow that).
if (date_time.seconds > 59)
return Error::from_string_literal("ICC::Profile: dateTimeNumber seconds out of bounds");
struct tm tm = {};
tm.tm_year = date_time.year - 1900;
tm.tm_mon = date_time.month - 1;
tm.tm_mday = date_time.day;
tm.tm_hour = date_time.hour;
tm.tm_min = date_time.minutes;
tm.tm_sec = date_time.seconds;
// timegm() doesn't read tm.tm_isdst, tm.tm_wday, and tm.tm_yday, no need to fill them in.
time_t timestamp = timegm(&tm);
if (timestamp == -1)
return Error::from_string_literal("ICC::Profile: dateTimeNumber not representable as timestamp");
return timestamp;
}
// ICC V4, 7.2 Profile header
struct ICCHeader {
BigEndian<u32> profile_size;
BigEndian<u32> preferred_cmm_type;
u8 profile_version_major;
u8 profile_version_minor_bugfix;
BigEndian<u16> profile_version_zero;
BigEndian<DeviceClass> profile_device_class;
BigEndian<u32> data_color_space;
BigEndian<u32> pcs; // "Profile Connection Space"
DateTimeNumber profile_creation_time;
BigEndian<u32> profile_file_signature;
BigEndian<u32> primary_platform;
BigEndian<u32> profile_flags;
BigEndian<u32> device_manufacturer;
BigEndian<u32> device_model;
BigEndian<u64> device_attributes;
BigEndian<u32> rendering_intent;
BigEndian<i32> pcs_illuminant_x;
BigEndian<i32> pcs_illuminant_y;
BigEndian<i32> pcs_illuminant_z;
BigEndian<u32> profile_creator;
u8 profile_md5[16];
u8 reserved[28];
};
static_assert(sizeof(ICCHeader) == 128);
ErrorOr<Version> parse_version(ICCHeader const& header)
{
// ICC v4, 7.2.4 Profile version field
if (header.profile_version_zero != 0)
return Error::from_string_literal("ICC::Profile: Reserved version bytes not zero");
return Version(header.profile_version_major, header.profile_version_minor_bugfix);
}
ErrorOr<DeviceClass> parse_device_class(ICCHeader const& header)
{
// ICC v4, 7.2.5 Profile/device class field
switch (header.profile_device_class) {
case DeviceClass::InputDevce:
case DeviceClass::DisplayDevice:
case DeviceClass::OutputDevice:
case DeviceClass::DeviceLink:
case DeviceClass::ColorSpace:
case DeviceClass::Abstract:
case DeviceClass::NamedColor:
return header.profile_device_class;
}
return Error::from_string_literal("ICC::Profile: Invalid device class");
}
ErrorOr<time_t> parse_creation_date_time(ICCHeader const& header)
{
// iCC v4, 7.2.8 Date and time field
return parse_date_time_number(header.profile_creation_time);
}
ErrorOr<void> parse_file_signature(ICCHeader const& header)
{
// iCC v4, 7.2.9 Profile file signature field
if (header.profile_file_signature != 0x61637370)
return Error::from_string_literal("ICC::Profile: profile file signature not 'acsp'");
return {};
}
}
char const* device_class_name(DeviceClass device_class)
{
switch (device_class) {
case DeviceClass::InputDevce:
return "InputDevce";
case DeviceClass::DisplayDevice:
return "DisplayDevice";
case DeviceClass::OutputDevice:
return "OutputDevice";
case DeviceClass::DeviceLink:
return "DeviceLink";
case DeviceClass::ColorSpace:
return "ColorSpace";
case DeviceClass::Abstract:
return "Abstract";
case DeviceClass::NamedColor:
return "NamedColor";
default:
return "(unknown device class)";
}
}
ErrorOr<NonnullRefPtr<Profile>> Profile::try_load_from_externally_owned_memory(ReadonlyBytes bytes)
{
auto profile = adopt_ref(*new Profile());
if (bytes.size() < sizeof(ICCHeader))
return Error::from_string_literal("ICC::Profile: Not enough data for header");
auto header = *bit_cast<ICCHeader const*>(bytes.data());
TRY(parse_file_signature(header));
profile->m_version = TRY(parse_version(header));
profile->m_device_class = TRY(parse_device_class(header));
profile->m_creation_timestamp = TRY(parse_creation_date_time(header));
return profile;
}
}
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