snapshot of https://github.com/cortezaproject/corteza.git (2024.9.x, 2026-09-18; blobs > 131072B omitted)

server/vendor/github.com/mat/besticon/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015-2020 Matthias Lüdtke, Hamburg - https://github.com/mat
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

server/vendor/github.com/mat/besticon/ico/ico.go

@@ -0,0 +1,261 @@
+// Package ico registers image.Decode and DecodeConfig support
+// for the icon (container) format.
+package ico
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"image"
+	"io"
+	"io/ioutil"
+
+	"image/png"
+
+	"golang.org/x/image/bmp"
+)
+
+type icondir struct {
+	Reserved uint16
+	Type     uint16
+	Count    uint16
+	Entries  []icondirEntry
+}
+
+type icondirEntry struct {
+	Width        byte
+	Height       byte
+	PaletteCount byte
+	Reserved     byte
+	ColorPlanes  uint16
+	BitsPerPixel uint16
+	Size         uint32
+	Offset       uint32
+}
+
+func (dir *icondir) FindBestIcon() *icondirEntry {
+	if len(dir.Entries) == 0 {
+		return nil
+	}
+
+	best := dir.Entries[0]
+	for _, e := range dir.Entries {
+		if (e.width() > best.width()) && (e.height() > best.height()) {
+			best = e
+		}
+	}
+	return &best
+}
+
+// ParseIco parses the icon and returns meta information for the icons as icondir.
+func ParseIco(r io.Reader) (*icondir, error) {
+	dir := icondir{}
+
+	var err error
+	err = binary.Read(r, binary.LittleEndian, &dir.Reserved)
+	if err != nil {
+		return nil, err
+	}
+
+	err = binary.Read(r, binary.LittleEndian, &dir.Type)
+	if err != nil {
+		return nil, err
+	}
+
+	err = binary.Read(r, binary.LittleEndian, &dir.Count)
+	if err != nil {
+		return nil, err
+	}
+
+	for i := uint16(0); i < dir.Count; i++ {
+		entry := icondirEntry{}
+		e := parseIcondirEntry(r, &entry)
+		if e != nil {
+			return nil, e
+		}
+		dir.Entries = append(dir.Entries, entry)
+	}
+
+	return &dir, err
+}
+
+func parseIcondirEntry(r io.Reader, e *icondirEntry) error {
+	err := binary.Read(r, binary.LittleEndian, e)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+type dibHeader struct {
+	dibHeaderSize uint32
+	width         uint32
+	height        uint32
+}
+
+func (e *icondirEntry) ColorCount() int {
+	if e.PaletteCount == 0 {
+		return 256
+	}
+	return int(e.PaletteCount)
+}
+
+func (e *icondirEntry) width() int {
+	if e.Width == 0 {
+		return 256
+	}
+	return int(e.Width)
+}
+
+func (e *icondirEntry) height() int {
+	if e.Height == 0 {
+		return 256
+	}
+	return int(e.Height)
+}
+
+// DecodeConfig returns just the dimensions of the largest image
+// contained in the icon withou decoding the entire icon file.
+func DecodeConfig(r io.Reader) (image.Config, error) {
+	dir, err := ParseIco(r)
+	if err != nil {
+		return image.Config{}, err
+	}
+
+	best := dir.FindBestIcon()
+	if best == nil {
+		return image.Config{}, errInvalid
+	}
+	return image.Config{Width: best.width(), Height: best.height()}, nil
+}
+
+// The bitmap header structure we read from an icondirEntry
+type bitmapHeaderRead struct {
+	Size            uint32
+	Width           uint32
+	Height          uint32
+	Planes          uint16
+	BitCount        uint16
+	Compression     uint32
+	ImageSize       uint32
+	XPixelsPerMeter uint32
+	YPixelsPerMeter uint32
+	ColorsUsed      uint32
+	ColorsImportant uint32
+}
+
+// The bitmap header structure we need to generate for bmp.Decode()
+type bitmapHeaderWrite struct {
+	sigBM           [2]byte
+	fileSize        uint32
+	resverved       [2]uint16
+	pixOffset       uint32
+	Size            uint32
+	Width           uint32
+	Height          uint32
+	Planes          uint16
+	BitCount        uint16
+	Compression     uint32
+	ImageSize       uint32
+	XPixelsPerMeter uint32
+	YPixelsPerMeter uint32
+	ColorsUsed      uint32
+	ColorsImportant uint32
+}
+
+var errInvalid = errors.New("ico: invalid ICO image")
+
+// Decode returns the largest image contained in the icon
+// which might be a bmp or png
+func Decode(r io.Reader) (image.Image, error) {
+	icoBytes, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+
+	r = bytes.NewReader(icoBytes)
+	dir, err := ParseIco(r)
+	if err != nil {
+		return nil, errInvalid
+	}
+
+	best := dir.FindBestIcon()
+	if best == nil {
+		return nil, errInvalid
+	}
+
+	return parseImage(best, icoBytes)
+}
+
+func parseImage(entry *icondirEntry, icoBytes []byte) (image.Image, error) {
+	r := bytes.NewReader(icoBytes)
+	r.Seek(int64(entry.Offset), 0)
+
+	// Try PNG first then BMP
+	img, err := png.Decode(r)
+	if err != nil {
+		return parseBMP(entry, icoBytes)
+	}
+	return img, nil
+}
+
+func parseBMP(entry *icondirEntry, icoBytes []byte) (image.Image, error) {
+	bmpBytes, err := makeFullBMPBytes(entry, icoBytes)
+	if err != nil {
+		return nil, err
+	}
+	return bmp.Decode(bmpBytes)
+}
+
+func makeFullBMPBytes(entry *icondirEntry, icoBytes []byte) (*bytes.Buffer, error) {
+	r := bytes.NewReader(icoBytes)
+	r.Seek(int64(entry.Offset), 0)
+
+	var err error
+	h := bitmapHeaderRead{}
+
+	err = binary.Read(r, binary.LittleEndian, &h)
+	if err != nil {
+		return nil, err
+	}
+
+	if h.Size != 40 || h.Planes != 1 {
+		return nil, errInvalid
+	}
+
+	var pixOffset uint32
+	if h.ColorsUsed == 0 && h.BitCount <= 8 {
+		pixOffset = 14 + 40 + 4*(1<<h.BitCount)
+	} else {
+		pixOffset = 14 + 40 + 4*h.ColorsUsed
+	}
+
+	writeHeader := &bitmapHeaderWrite{
+		sigBM:           [2]byte{'B', 'M'},
+		fileSize:        14 + 40 + uint32(len(icoBytes)), // correct? important?
+		pixOffset:       pixOffset,
+		Size:            40,
+		Width:           uint32(h.Width),
+		Height:          uint32(h.Height / 2),
+		Planes:          h.Planes,
+		BitCount:        h.BitCount,
+		Compression:     h.Compression,
+		ColorsUsed:      h.ColorsUsed,
+		ColorsImportant: h.ColorsImportant,
+	}
+
+	buf := new(bytes.Buffer)
+	if err = binary.Write(buf, binary.LittleEndian, writeHeader); err != nil {
+		return nil, err
+	}
+	io.CopyN(buf, r, int64(entry.Size))
+
+	return buf, nil
+}
+
+const icoHeader = "\x00\x00\x01\x00"
+
+func init() {
+	image.RegisterFormat("ico", icoHeader, Decode, DecodeConfig)
+}