31 lines
987 B
Plaintext
31 lines
987 B
Plaintext
// UTF-8 解码工具：将 Uint8Array 转换为字符串，兼容微信小程序无 TextDecoder 场景
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export function utf8ArrayToString(bytes: Uint8Array): string {
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let out = ''
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let i = 0
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const len = bytes.length
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while (i < len) {
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const c = bytes[i++]
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if (c < 0x80) {
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out += String.fromCharCode(c)
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} else if (c < 0xE0) {
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const c2 = bytes[i++]
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out += String.fromCharCode(((c & 0x1F) << 6) | (c2 & 0x3F))
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} else if (c < 0xF0) {
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const c2 = bytes[i++]
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const c3 = bytes[i++]
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out += String.fromCharCode(((c & 0x0F) << 12) | ((c2 & 0x3F) << 6) | (c3 & 0x3F))
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} else {
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const c2 = bytes[i++]
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const c3 = bytes[i++]
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const c4 = bytes[i++]
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let codepoint = ((c & 0x07) << 18) | ((c2 & 0x3F) << 12) | ((c3 & 0x3F) << 6) | (c4 & 0x3F)
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codepoint -= 0x10000
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out += String.fromCharCode(0xD800 + (codepoint >> 10))
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out += String.fromCharCode(0xDC00 + (codepoint & 0x3FF))
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}
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}
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return out
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}
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