/src/serenity/Userland/Libraries/LibGfx/ImageFormats/JPEGXLCommon.h

Source (jump to first uncovered line)
/*
 * Copyright (c) 2024, Lucas Chollet <lucas.chollet@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/BitStream.h>
#include <AK/FixedArray.h>
#include <AK/String.h>

namespace Gfx {
/// 4.2 - Functions
ALWAYS_INLINE i32 unpack_signed(u32 u)
{
    if (u % 2 == 0)
        return static_cast<i32>(u / 2);
    return -static_cast<i32>((u + 1) / 2);
}
///

/// B.2 - Field types
// This is defined as a macro in order to get lazy-evaluated parameter
// Note that the lambda will capture your context by reference.
#define U32(d0, d1, d2, d3)                            \
    ({                                                 \
        u8 const selector = TRY(stream.read_bits(2));  \
        auto value = [&, selector]() -> ErrorOr<u32> { \
            if (selector == 0)                         \
                return (d0);                           \
            if (selector == 1)                         \
                return (d1);                           \
            if (selector == 2)                         \
                return (d2);                           \
            if (selector == 3)                         \
                return (d3);                           \
            VERIFY_NOT_REACHED();                      \
        }();                                           \
        TRY(value);                                    \
    })

ALWAYS_INLINE ErrorOr<u64> U64(LittleEndianInputBitStream& stream)
{
    u8 const selector = TRY(stream.read_bits(2));
    if (selector == 0)
        return 0;
    if (selector == 1)
        return 1 + TRY(stream.read_bits(4));
    if (selector == 2)
        return 17 + TRY(stream.read_bits(8));

    VERIFY(selector == 3);

    u64 value = TRY(stream.read_bits(12));
    u8 shift = 12;
    while (TRY(stream.read_bits(1)) == 1) {
        if (shift == 60) {
            value += TRY(stream.read_bits(4)) << shift;
            break;
        }
        value += TRY(stream.read_bits(8)) << shift;
        shift += 8;
    }

    return value;
}

ALWAYS_INLINE ErrorOr<f32> F16(LittleEndianInputBitStream& stream)
{
#if defined(OSS_FUZZ)
    // FIXME: Use the below code path on oss-fuzz once it supports _Float16.
    (void)stream;
    return Error::from_string_literal("oss-fuzz does not yet support _Float16");
#else
    u16 const bits16 = TRY(stream.read_bits(16));
    auto const biased_exp = (bits16 >> 10) & 0x1F;
    VERIFY(biased_exp != 31);
    return bit_cast<_Float16>(bits16);
#endif
}

template<Enum E>
ErrorOr<E> read_enum(LittleEndianInputBitStream& stream)
{
    return static_cast<E>(U32(0, 1, 2 + TRY(stream.read_bits(4)), 18 + TRY(stream.read_bits(6))));
}
///

ErrorOr<ByteBuffer> read_icc(LittleEndianInputBitStream& stream);

}

Coverage Report

Created: 2025-09-05 06:52

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright (c) 2024, Lucas Chollet <lucas.chollet@serenityos.org>
3		*
4		* SPDX-License-Identifier: BSD-2-Clause
5		*/
6
7		#pragma once
8
9		#include <AK/BitStream.h>
10		#include <AK/FixedArray.h>
11		#include <AK/String.h>
12
13		namespace Gfx {
14		/// 4.2 - Functions
15		ALWAYS_INLINE i32 unpack_signed(u32 u)
16	0	{
17	0	if (u % 2 == 0)
18	0	return static_cast<i32>(u / 2);
19	0	return -static_cast<i32>((u + 1) / 2);
20	0	}
21		///
22
23		/// B.2 - Field types
24		// This is defined as a macro in order to get lazy-evaluated parameter
25		// Note that the lambda will capture your context by reference.
26		#define U32(d0, d1, d2, d3) \
27	0	({ \
28	0	u8 const selector = TRY(stream.read_bits(2)); \
29	0	auto value = [&, selector]() -> ErrorOr<u32> { \
30	0	if (selector == 0) \
31	0	return (d0); \
32	0	if (selector == 1) \
33	0	return (d1); \
34	0	if (selector == 2) \
35	0	return (d2); \
36	0	if (selector == 3) \
37	0	return (d3); \
38	0	VERIFY_NOT_REACHED(); \
39	0	}(); \ Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_size_header(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_size_header(AK::LittleEndianInputBitStream&)::$_1::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_bit_depth(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_bit_depth(AK::LittleEndianInputBitStream&)::$_1::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_metadata_header(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: _ZZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_16ExtraChannelInfo16ExtraChannelTypeEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamEENKUlvE_clEv Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_extra_channel_info(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_string(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: _ZZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding11ColourSpaceEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamEENKUlvE_clEv Unexecuted instantiation: _ZZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding10WhitePointEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamEENKUlvE_clEv Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_custom_xy(AK::LittleEndianInputBitStream&)::$_0::operator()() const::{lambda()#1}::operator()() const Unexecuted instantiation: _ZZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding9PrimariesEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamEENKUlvE_clEv Unexecuted instantiation: _ZZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding16TransferFunctionEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamEENKUlvE_clEv Unexecuted instantiation: _ZZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding15RenderingIntentEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamEENKUlvE_clEv Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_frame_header(AK::LittleEndianInputBitStream&, Gfx::SizeHeader, Gfx::ImageMetadata const&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_frame_header(AK::LittleEndianInputBitStream&, Gfx::SizeHeader, Gfx::ImageMetadata const&)::$_1::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_passes(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_frame_header(AK::LittleEndianInputBitStream&, Gfx::SizeHeader, Gfx::ImageMetadata const&)::$_2::operator()() const::{lambda()#1}::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_blending_info(AK::LittleEndianInputBitStream&, Gfx::ImageMetadata const&, bool)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_blending_info(AK::LittleEndianInputBitStream&, Gfx::ImageMetadata const&, bool)::$_1::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_toc(AK::LittleEndianInputBitStream&, Gfx::FrameHeader const&, unsigned long, unsigned long)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_modular_bitstream(AK::LittleEndianInputBitStream&, Gfx::ModularOptions&&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_transform_info(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_transform_info(AK::LittleEndianInputBitStream&)::$_1::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_transform_info(AK::LittleEndianInputBitStream&)::$_2::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_transform_info(AK::LittleEndianInputBitStream&)::$_3::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_transform_info(AK::LittleEndianInputBitStream&)::$_4::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_transform_info(AK::LittleEndianInputBitStream&)::$_5::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_squeeze_params(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: JPEGXLLoader.cpp:Gfx::read_squeeze_params(AK::LittleEndianInputBitStream&)::$_1::operator()() const Unexecuted instantiation: JPEGXLEntropyDecoder.cpp:Gfx::(anonymous namespace)::read_lz77(AK::LittleEndianInputBitStream&)::$_0::operator()() const Unexecuted instantiation: JPEGXLEntropyDecoder.cpp:Gfx::(anonymous namespace)::read_lz77(AK::LittleEndianInputBitStream&)::$_1::operator()() const
40	0	TRY(value); \
41	0	})
42
43		ALWAYS_INLINE ErrorOr<u64> U64(LittleEndianInputBitStream& stream)
44	0	{
45	0	u8 const selector = TRY(stream.read_bits(2));
46	0	if (selector == 0)
47	0	return 0;
48	0	if (selector == 1)
49	0	return 1 + TRY(stream.read_bits(4));
50	0	if (selector == 2)
51	0	return 17 + TRY(stream.read_bits(8));
52
53	0	VERIFY(selector == 3);
54
55	0	u64 value = TRY(stream.read_bits(12));
56	0	u8 shift = 12;
57	0	while (TRY(stream.read_bits(1)) == 1) {
58	0	if (shift == 60) {
59	0	value += TRY(stream.read_bits(4)) << shift;
60	0	break;
61	0	}
62	0	value += TRY(stream.read_bits(8)) << shift;
63	0	shift += 8;
64	0	}
65
66	0	return value;
67	0	}
68
69		ALWAYS_INLINE ErrorOr<f32> F16(LittleEndianInputBitStream& stream)
70	0	{
71	0	#if defined(OSS_FUZZ)
72		// FIXME: Use the below code path on oss-fuzz once it supports _Float16.
73	0	(void)stream;
74	0	return Error::from_string_literal("oss-fuzz does not yet support _Float16");
75		#else
76		u16 const bits16 = TRY(stream.read_bits(16));
77		auto const biased_exp = (bits16 >> 10) & 0x1F;
78		VERIFY(biased_exp != 31);
79		return bit_cast<_Float16>(bits16);
80		#endif
81	0	}
82
83		template<Enum E>
84		ErrorOr<E> read_enum(LittleEndianInputBitStream& stream)
85	0	{
86	0	return static_cast<E>(U32(0, 1, 2 + TRY(stream.read_bits(4)), 18 + TRY(stream.read_bits(6))));
87	0	} Unexecuted instantiation: _ZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_16ExtraChannelInfo16ExtraChannelTypeEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamE Unexecuted instantiation: _ZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding11ColourSpaceEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamE Unexecuted instantiation: _ZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding10WhitePointEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamE Unexecuted instantiation: _ZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding9PrimariesEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamE Unexecuted instantiation: _ZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding16TransferFunctionEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamE Unexecuted instantiation: _ZN3Gfx9read_enumITkN2AK8Concepts4EnumENS_14ColourEncoding15RenderingIntentEEENS1_7ErrorOrIT_NS1_5ErrorEEERNS1_26LittleEndianInputBitStreamE
88		///
89
90		ErrorOr<ByteBuffer> read_icc(LittleEndianInputBitStream& stream);
91
92		}