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Made-with: Cursor
2026-03-25 15:00:14 +08:00
parent b83ec91b1a
commit 7811adca66
1050 changed files with 146524 additions and 37 deletions
--- a/server/vendor/github.com/pion/sdp/v3/base_lexer.go
+++ b/server/vendor/github.com/pion/sdp/v3/base_lexer.go
@@ -0,0 +1,216 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sdp
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+)
+
+var errDocumentStart = errors.New("already on document start")
+
+type syntaxError struct {
+	s string
+	i int
+}
+
+func (e syntaxError) Error() string {
+	if e.i < 0 {
+		e.i = 0
+	}
+	return fmt.Sprintf("sdp: syntax error at pos %d: %s", e.i, strconv.QuoteToASCII(e.s[e.i:e.i+1]))
+}
+
+type baseLexer struct {
+	value string
+	pos   int
+}
+
+func (l baseLexer) syntaxError() error {
+	return syntaxError{s: l.value, i: l.pos - 1}
+}
+
+func (l *baseLexer) unreadByte() error {
+	if l.pos <= 0 {
+		return errDocumentStart
+	}
+	l.pos--
+	return nil
+}
+
+func (l *baseLexer) readByte() (byte, error) {
+	if l.pos >= len(l.value) {
+		return byte(0), io.EOF
+	}
+	ch := l.value[l.pos]
+	l.pos++
+	return ch, nil
+}
+
+func (l *baseLexer) nextLine() error {
+	for {
+		ch, err := l.readByte()
+		if errors.Is(err, io.EOF) {
+			return nil
+		} else if err != nil {
+			return err
+		}
+		if !isNewline(ch) {
+			return l.unreadByte()
+		}
+	}
+}
+
+func (l *baseLexer) readWhitespace() error {
+	for {
+		ch, err := l.readByte()
+		if errors.Is(err, io.EOF) {
+			return nil
+		} else if err != nil {
+			return err
+		}
+		if !isWhitespace(ch) {
+			return l.unreadByte()
+		}
+	}
+}
+
+func (l *baseLexer) readUint64Field() (i uint64, err error) {
+	for {
+		ch, err := l.readByte()
+		if errors.Is(err, io.EOF) && i > 0 {
+			break
+		} else if err != nil {
+			return i, err
+		}
+
+		if isNewline(ch) {
+			if err := l.unreadByte(); err != nil {
+				return i, err
+			}
+			break
+		}
+
+		if isWhitespace(ch) {
+			if err := l.readWhitespace(); err != nil {
+				return i, err
+			}
+			break
+		}
+
+		switch ch {
+		case '0':
+			i *= 10
+		case '1':
+			i = i*10 + 1
+		case '2':
+			i = i*10 + 2
+		case '3':
+			i = i*10 + 3
+		case '4':
+			i = i*10 + 4
+		case '5':
+			i = i*10 + 5
+		case '6':
+			i = i*10 + 6
+		case '7':
+			i = i*10 + 7
+		case '8':
+			i = i*10 + 8
+		case '9':
+			i = i*10 + 9
+		default:
+			return i, l.syntaxError()
+		}
+	}
+
+	return i, nil
+}
+
+// Returns next field on this line or empty string if no more fields on line
+func (l *baseLexer) readField() (string, error) {
+	start := l.pos
+	var stop int
+	for {
+		stop = l.pos
+		ch, err := l.readByte()
+		if errors.Is(err, io.EOF) && stop > start {
+			break
+		} else if err != nil {
+			return "", err
+		}
+
+		if isNewline(ch) {
+			if err := l.unreadByte(); err != nil {
+				return "", err
+			}
+			break
+		}
+
+		if isWhitespace(ch) {
+			if err := l.readWhitespace(); err != nil {
+				return "", err
+			}
+			break
+		}
+	}
+	return l.value[start:stop], nil
+}
+
+// Returns symbols until line end
+func (l *baseLexer) readLine() (string, error) {
+	start := l.pos
+	trim := 1
+	for {
+		ch, err := l.readByte()
+		if err != nil {
+			return "", err
+		}
+		if ch == '\r' {
+			trim++
+		}
+		if ch == '\n' {
+			return l.value[start : l.pos-trim], nil
+		}
+	}
+}
+
+func (l *baseLexer) readType() (byte, error) {
+	for {
+		firstByte, err := l.readByte()
+		if err != nil {
+			return 0, err
+		}
+
+		if isNewline(firstByte) {
+			continue
+		}
+
+		secondByte, err := l.readByte()
+		if err != nil {
+			return 0, err
+		}
+
+		if secondByte != '=' {
+			return firstByte, l.syntaxError()
+		}
+
+		return firstByte, nil
+	}
+}
+
+func isNewline(ch byte) bool { return ch == '\n' || ch == '\r' }
+
+func isWhitespace(ch byte) bool { return ch == ' ' || ch == '\t' }
+
+func anyOf(element string, data ...string) bool {
+	for _, v := range data {
+		if element == v {
+			return true
+		}
+	}
+	return false
+}