forked from mirror/go-json
834 lines
14 KiB
Go
834 lines
14 KiB
Go
package encoder
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import (
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"math/bits"
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"reflect"
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"unsafe"
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"github.com/goccy/go-json/internal/runtime"
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)
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const (
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lsb = 0x0101010101010101
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msb = 0x8080808080808080
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)
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var needEscapeWithHTML = [256]bool{
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'"': true,
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'&': true,
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'<': true,
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'>': true,
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'\\': true,
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0x00: true,
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0x01: true,
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0x02: true,
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0x03: true,
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0x04: true,
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0x05: true,
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0x06: true,
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0x07: true,
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0x08: true,
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0x09: true,
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0x0a: true,
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0x0b: true,
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0x0c: true,
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0x0d: true,
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0x0e: true,
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0x0f: true,
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0x10: true,
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0x11: true,
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0x12: true,
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0x13: true,
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0x14: true,
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0x15: true,
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0x16: true,
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0x17: true,
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0x18: true,
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0x19: true,
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0x1a: true,
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0x1b: true,
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0x1c: true,
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0x1d: true,
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0x1e: true,
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0x1f: true,
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/* 0x20 - 0x7f */
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0x80: true,
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0x81: true,
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0x82: true,
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0x83: true,
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0x84: true,
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0x85: true,
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0x86: true,
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0x87: true,
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0x88: true,
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0x89: true,
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0x8a: true,
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0x8b: true,
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0x8c: true,
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0x8d: true,
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0x8e: true,
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0x8f: true,
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0x90: true,
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0x91: true,
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0x92: true,
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0x93: true,
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0x94: true,
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0x95: true,
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0x96: true,
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0x97: true,
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0x98: true,
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0x99: true,
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0x9a: true,
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0x9b: true,
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0x9c: true,
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0x9d: true,
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0x9e: true,
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0x9f: true,
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0xa0: true,
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0xa1: true,
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0xa2: true,
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0xa3: true,
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0xa4: true,
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0xa5: true,
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0xa6: true,
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0xa7: true,
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0xa8: true,
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0xa9: true,
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0xaa: true,
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0xab: true,
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0xac: true,
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0xad: true,
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0xae: true,
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0xaf: true,
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0xb0: true,
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0xb1: true,
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0xb2: true,
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0xb3: true,
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0xb4: true,
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0xb5: true,
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0xb6: true,
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0xb7: true,
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0xb8: true,
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0xb9: true,
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0xba: true,
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0xbb: true,
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0xbc: true,
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0xbd: true,
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0xbe: true,
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0xbf: true,
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0xc0: true,
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0xc1: true,
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0xc2: true,
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0xc3: true,
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0xc4: true,
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0xc5: true,
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0xc6: true,
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0xc7: true,
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0xc8: true,
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0xc9: true,
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0xca: true,
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0xcb: true,
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0xcc: true,
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0xcd: true,
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0xce: true,
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0xcf: true,
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0xd0: true,
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0xd1: true,
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0xd2: true,
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0xd3: true,
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0xd4: true,
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0xd5: true,
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0xd6: true,
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0xd7: true,
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0xd8: true,
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0xd9: true,
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0xda: true,
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0xdb: true,
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0xdc: true,
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0xdd: true,
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0xde: true,
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0xdf: true,
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0xe0: true,
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0xe1: true,
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0xe2: true,
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0xe3: true,
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0xe4: true,
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0xe5: true,
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0xe6: true,
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0xe7: true,
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0xe8: true,
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0xe9: true,
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0xea: true,
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0xeb: true,
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0xec: true,
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0xed: true,
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0xee: true,
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0xef: true,
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0xf0: true,
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0xf1: true,
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0xf2: true,
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0xf3: true,
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0xf4: true,
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0xf5: true,
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0xf6: true,
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0xf7: true,
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0xf8: true,
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0xf9: true,
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0xfa: true,
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0xfb: true,
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0xfc: true,
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0xfd: true,
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0xfe: true,
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0xff: true,
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}
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var needEscape = [256]bool{
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'"': true,
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'\\': true,
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0x00: true,
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0x01: true,
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0x02: true,
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0x03: true,
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0x04: true,
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0x05: true,
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0x06: true,
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0x07: true,
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0x08: true,
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0x09: true,
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0x0a: true,
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0x0b: true,
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0x0c: true,
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0x0d: true,
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0x0e: true,
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0x0f: true,
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0x10: true,
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0x11: true,
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0x12: true,
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0x13: true,
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0x14: true,
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0x15: true,
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0x16: true,
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0x17: true,
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0x18: true,
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0x19: true,
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0x1a: true,
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0x1b: true,
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0x1c: true,
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0x1d: true,
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0x1e: true,
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0x1f: true,
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/* 0x20 - 0x7f */
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0x80: true,
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0x81: true,
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0x82: true,
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0x83: true,
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0x84: true,
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0x85: true,
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0x86: true,
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0x87: true,
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0x88: true,
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0x89: true,
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0x8a: true,
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0x8b: true,
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0x8c: true,
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0x8d: true,
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0x8e: true,
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0x8f: true,
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0x90: true,
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0x91: true,
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0x92: true,
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0x93: true,
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0x94: true,
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0x95: true,
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0x96: true,
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0x97: true,
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0x98: true,
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0x99: true,
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0x9a: true,
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0x9b: true,
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0x9c: true,
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0x9d: true,
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0x9e: true,
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0x9f: true,
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0xa0: true,
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0xa1: true,
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0xa2: true,
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0xa3: true,
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0xa4: true,
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0xa5: true,
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0xa6: true,
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0xa7: true,
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0xa8: true,
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0xa9: true,
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0xaa: true,
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0xab: true,
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0xac: true,
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0xad: true,
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0xae: true,
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0xaf: true,
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0xb0: true,
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0xb1: true,
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0xb2: true,
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0xb3: true,
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0xb4: true,
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0xb5: true,
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0xb6: true,
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0xb7: true,
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0xb8: true,
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0xb9: true,
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0xba: true,
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0xbb: true,
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0xbc: true,
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0xbd: true,
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0xbe: true,
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0xbf: true,
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0xc0: true,
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0xc1: true,
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0xc2: true,
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0xc3: true,
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0xc4: true,
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0xc5: true,
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0xc6: true,
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0xc7: true,
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0xc8: true,
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0xc9: true,
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0xca: true,
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0xcb: true,
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0xcc: true,
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0xcd: true,
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0xce: true,
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0xcf: true,
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0xd0: true,
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0xd1: true,
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0xd2: true,
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0xd3: true,
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0xd4: true,
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0xd5: true,
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0xd6: true,
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0xd7: true,
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0xd8: true,
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0xd9: true,
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0xda: true,
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0xdb: true,
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0xdc: true,
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0xdd: true,
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0xde: true,
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0xdf: true,
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0xe0: true,
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0xe1: true,
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0xe2: true,
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0xe3: true,
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0xe4: true,
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0xe5: true,
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0xe6: true,
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0xe7: true,
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0xe8: true,
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0xe9: true,
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0xea: true,
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0xeb: true,
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0xec: true,
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0xed: true,
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0xee: true,
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0xef: true,
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0xf0: true,
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0xf1: true,
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0xf2: true,
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0xf3: true,
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0xf4: true,
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0xf5: true,
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0xf6: true,
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0xf7: true,
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0xf8: true,
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0xf9: true,
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0xfa: true,
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0xfb: true,
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0xfc: true,
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0xfd: true,
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0xfe: true,
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0xff: true,
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}
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var hex = "0123456789abcdef"
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//nolint:govet
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func stringToUint64Slice(s string) []uint64 {
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return *(*[]uint64)(unsafe.Pointer(&reflect.SliceHeader{
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Data: ((*reflect.StringHeader)(unsafe.Pointer(&s))).Data,
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Len: len(s) / 8,
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Cap: len(s) / 8,
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}))
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}
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func AppendString(ctx *RuntimeContext, buf []byte, s string) []byte {
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if ctx.Option.Flag&HTMLEscapeOption == 0 {
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return appendString(buf, s)
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}
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valLen := len(s)
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if valLen == 0 {
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return append(buf, `""`...)
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}
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buf = append(buf, '"')
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var (
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i, j int
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)
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orgLen := valLen
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base := (*runtime.SliceHeader)(unsafe.Pointer(&s)).Data
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for {
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valLen = len(s) - j
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if valLen <= 0 {
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return append(append(buf, s[i:]...), '"')
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}
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data := unsafe.Pointer(uintptr(base) + uintptr(j))
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switch valLen {
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case 1:
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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return append(append(buf, s[i:]...), '"')
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case 2:
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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return append(append(buf, s[i:]...), '"')
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case 3:
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
|
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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return append(append(buf, s[i:]...), '"')
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case 4:
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
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}
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j++
|
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
|
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j++
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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return append(append(buf, s[i:]...), '"')
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case 5:
|
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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j++
|
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if needEscapeWithHTML[s[j]] {
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goto ESCAPE
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}
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return append(append(buf, s[i:]...), '"')
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case 6:
|
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
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}
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j++
|
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
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}
|
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j++
|
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
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}
|
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j++
|
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
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}
|
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j++
|
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
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}
|
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j++
|
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
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}
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return append(append(buf, s[i:]...), '"')
|
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case 7:
|
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if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
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}
|
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j++
|
|
if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscapeWithHTML[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscapeWithHTML[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscapeWithHTML[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscapeWithHTML[s[j]] {
|
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goto ESCAPE
|
|
}
|
|
return append(append(buf, s[i:]...), '"')
|
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case 8, 9, 10, 11, 12, 13, 14, 15:
|
|
chunks := stringToUint64Slice(s[j:])
|
|
for _, n := range chunks {
|
|
// combine masks before checking for the MSB of each byte. We include
|
|
// `n` in the mask to check whether any of the *input* byte MSBs were
|
|
// set (i.e. the byte was outside the ASCII range).
|
|
mask := n | (n - (lsb * 0x20)) |
|
|
((n ^ (lsb * '"')) - lsb) |
|
|
((n ^ (lsb * '\\')) - lsb) |
|
|
((n ^ (lsb * '<')) - lsb) |
|
|
((n ^ (lsb * '>')) - lsb) |
|
|
((n ^ (lsb * '&')) - lsb)
|
|
if (mask & msb) != 0 {
|
|
j += bits.TrailingZeros64(mask&msb) / 8
|
|
goto ESCAPE
|
|
}
|
|
}
|
|
j += len(chunks) * 8
|
|
case 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31:
|
|
j += _findHTMLEscapeIndex128(data, valLen)
|
|
default:
|
|
j += _findHTMLEscapeIndex256(data, valLen)
|
|
}
|
|
if j >= orgLen {
|
|
return append(append(buf, s[i:]...), '"')
|
|
}
|
|
ESCAPE:
|
|
c := s[j]
|
|
if !needEscapeWithHTML[c] {
|
|
j++
|
|
continue
|
|
}
|
|
switch c {
|
|
case '\\', '"':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', c)
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\n':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'n')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\r':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'r')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\t':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 't')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '<', '>', '&':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u00`...)
|
|
buf = append(buf, hex[c>>4], hex[c&0xF])
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, // 0x00-0x0F
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F: // 0x10-0x1F
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u00`...)
|
|
buf = append(buf, hex[c>>4], hex[c&0xF])
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
}
|
|
state, size := decodeRuneInString(s[j:])
|
|
switch state {
|
|
case runeErrorState:
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\ufffd`...)
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
// U+2028 is LINE SEPARATOR.
|
|
// U+2029 is PARAGRAPH SEPARATOR.
|
|
// They are both technically valid characters in JSON strings,
|
|
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
|
// and can lead to security holes there. It is valid JSON to
|
|
// escape them, so we do so unconditionally.
|
|
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
|
case lineSepState:
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u2028`...)
|
|
i = j + 3
|
|
j = j + 3
|
|
continue
|
|
case paragraphSepState:
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u2029`...)
|
|
i = j + 3
|
|
j = j + 3
|
|
continue
|
|
}
|
|
j += size
|
|
}
|
|
}
|
|
|
|
func appendString(buf []byte, s string) []byte {
|
|
valLen := len(s)
|
|
if valLen == 0 {
|
|
return append(buf, `""`...)
|
|
}
|
|
buf = append(buf, '"')
|
|
var (
|
|
i, j int
|
|
)
|
|
base := (*runtime.SliceHeader)(unsafe.Pointer(&s)).Data
|
|
orgLen := valLen
|
|
for {
|
|
valLen = len(s) - j
|
|
if valLen <= 0 {
|
|
return append(append(buf, s[i:]...), '"')
|
|
}
|
|
data := unsafe.Pointer(uintptr(base) + uintptr(j))
|
|
switch valLen {
|
|
case 1:
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
return append(buf, s[i], '"')
|
|
case 2:
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
return append(append(buf, s[i:]...), '"')
|
|
case 3:
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
return append(append(buf, s[i:]...), '"')
|
|
case 4:
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
return append(append(buf, s[i:]...), '"')
|
|
case 5:
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
return append(append(buf, s[i:]...), '"')
|
|
case 6:
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
return append(append(buf, s[i:]...), '"')
|
|
case 7:
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
j++
|
|
if needEscape[s[j]] {
|
|
goto ESCAPE
|
|
}
|
|
return append(append(buf, s[i:]...), '"')
|
|
case 8, 9, 10, 11, 12, 13, 14, 15:
|
|
j += _findEscapeIndex64(data, valLen)
|
|
case 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31:
|
|
j += _findEscapeIndex128(data, valLen)
|
|
default:
|
|
j += _findEscapeIndex256(data, valLen)
|
|
}
|
|
if j == orgLen {
|
|
return append(append(buf, s[i:]...), '"')
|
|
}
|
|
ESCAPE:
|
|
c := s[j]
|
|
if !needEscape[c] {
|
|
j++
|
|
continue
|
|
}
|
|
switch c {
|
|
case '\\', '"':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', c)
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\n':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'n')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\r':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'r')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\t':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 't')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, // 0x00-0x0F
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F: // 0x10-0x1F
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u00`...)
|
|
buf = append(buf, hex[c>>4], hex[c&0xF])
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
}
|
|
state, size := decodeRuneInString(s[j:])
|
|
switch state {
|
|
case runeErrorState:
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\ufffd`...)
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
// U+2028 is LINE SEPARATOR.
|
|
// U+2029 is PARAGRAPH SEPARATOR.
|
|
// They are both technically valid characters in JSON strings,
|
|
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
|
// and can lead to security holes there. It is valid JSON to
|
|
// escape them, so we do so unconditionally.
|
|
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
|
case lineSepState:
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u2028`...)
|
|
i = j + 3
|
|
j = j + 3
|
|
continue
|
|
case paragraphSepState:
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u2029`...)
|
|
i = j + 3
|
|
j = j + 3
|
|
continue
|
|
}
|
|
j += size
|
|
}
|
|
}
|