{"id":208299,"date":"2025-07-08T17:48:29","date_gmt":"2025-07-08T09:48:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208299\/"},"modified":"2025-07-08T17:48:29","modified_gmt":"2025-07-08T09:48:29","slug":"golang%e4%b8%ad%e7%9a%84%e5%af%b9%e9%bd%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208299\/","title":{"rendered":"golang\u4e2d\u7684\u5bf9\u9f50"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> golang\u4e2d\u7684\u5bf9\u9f50<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-05-01 14:24:35<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u6211\u4eec\u8981\u52aa\u529b\u5b66\u4e60\u5566\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300agolang\u4e2d\u7684\u5bf9\u9f50\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4e0b\u6587\u4e2d\u7684\u5185\u5bb9\u6211\u4eec\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5728\u9605\u8bfb\u672c\u6587\u8fc7\u7a0b\u4e2d\u6709\u9047\u5230\u4e0d\u6e05\u695a\u7684\u5730\u65b9\uff0c\u6b22\u8fce\u7559\u8a00\u5440\uff01\u6211\u4eec\u4e00\u8d77\u8ba8\u8bba\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u6b63\u5728 golang \u4e2d\u5b9e\u73b0\u4e00\u4e2a\u7f51\u7edc\u6570\u636e\u5305\u3002\u5b83\u5df2\u7ecf\u7528 c++ \u5b9e\u73b0\u4e86\u3002 \u76ee\u7684\u662f\u8ba9golang\u5b9e\u73b0\u7684\u5ba2\u6237\u7aef\u4e0ec++\u5b9e\u73b0\u7684\u670d\u52a1\u5668\u8fdb\u884c\u901a\u4fe1\u3002 <\/p>\n

\u4ed6\u4eec\u5c06\u901a\u8fc7\u6570\u636e\u5305\u8fdb\u884c\u901a\u4fe1\u3002\u6570\u636e\u5305\u7ed3\u6784\u4e3a\uff1a<\/p>\n

type packet struct {\n    length   uint32\n    namelen  uint8\n    data     []byte\n} \/\/ in golang\n\nstruct packet {\n    uint32_t length;\n    uint8_t  namelen;\n    byte     data[];\n} \/\/ in c++<\/pre>\n
\u5b83\u4eec\u7684\u4e0b\u5212\u7ebf\u7ed3\u6784\u662f\u5b57\u8282\u6570\u7ec4\u3002\u5f53\u63a5\u6536\u5230\u5b57\u8282\u6570\u7ec4\u683c\u5f0f\u7684\u6d88\u606f\u65f6\u3002\u6211\u4eec\u9700\u8981\u5c06\u5176\u8f6c\u6362\u4e3apacket\u3002<\/p>\n
auto p = reinterpret_cast<packet*>(buffer); \/\/ in c++\n(buffer's alignment is manually set as 64)\n\np := (packet)(unsafe.pointer(&buffer)) \/\/ in golang<\/pre>\n
\u4e3a\u4e86\u4f7f\u5b83\u4eec\u80fd\u591f\u901a\u4fe1\uff0c\u5b83\u4eec\u7684\u7ed3\u6784\u5bf9\u9f50\u5e94\u8be5\u4fdd\u6301\u76f8\u540c\u3002<\/p>\n
\u95ee\u9898\u6765\u4e86\uff1a \u6253\u5370\u51fa\u5b83\u4eec\u7684\u5bf9\u9f50\u65b9\u5f0f\u540e\uff0c\u6211\u5f97\u5230\uff1a<\/p>\n
type Packet struct {\n    length  uint32 \/\/ alignment 8\n    nameLen uint8  \/\/ alignment 8\n    data    []byte \/\/ alignment 8\n}\nstruct Packet {\n    uint32_t length;  \/\/ alignment 4\n    uint8    nameLen; \/\/ alignment 4\n    data     []byte;  \/\/ alignment 1\n}<\/pre>\n
\u7531\u4e8e\u5bf9\u9f50\u65b9\u5f0f\u4e0d\u540c\uff0c\u5b83\u4eec\u4f1a\u5bf9\u6d88\u606f\u8fdb\u884c\u4e0d\u540c\u7684\u89e3\u7801\u3002<\/p>\n
\u6211\u65e0\u6cd5\u66f4\u6539 c++ \u4ee3\u7801\u3002<\/p>\n
\u95ee\u98981\uff1agolang\u4e2d\u6709\u6ca1\u6709\u529e\u6cd5\u8bbe\u7f6e\u7ed3\u6784\u4f53\u5b57\u6bb5\u5bf9\u9f50\uff1f<\/strong><\/p>\n
\u95ee\u98982\uff1a\u662f\u5426\u6709\u66f4\u597d\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0golang packet\uff0c\u4ee5\u907f\u514d\u5c06\u7f13\u51b2\u533a\u8f6c\u6362\u4e3a\u6570\u636e\u5305\u65f6\u5bf9\u9f50\u4e0d\u5339\u914d\uff1f<\/strong><\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u6839\u636e adrian \u548c volker \u7684\u8bc4\u8bba\uff0c<\/p>\n
\u7b2c\u4e00\u4e2a\u95ee\u9898\uff1a\u5426<\/strong> <\/p>\n
q2\uff1a\u8fdb\u884c\u4e00\u4e9b\u7f16\u7a0b\u6765\u5355\u72ec\u89e3\u5305\u5b57\u6bb5\u3002<\/strong><\/p>\n
\u5728encoding\/binary<\/strong>\u5305\u4e2d\uff0c\u6211\u4eec\u6709<\/p>\n
func putuvarint<\/pre>\n
\u5b83\u5c06 uint64 \u7f16\u7801\u4e3a buf \u5e76\u8fd4\u56de\u5199\u5165\u7684\u5b57\u8282\u6570\u3002 \u4e0d\u77e5\u4f55\u6545\uff0c\u8fd9\u4e2a\u5305\u6ca1\u6709\u516c\u5171\u51fd\u6570\u6765\u7f16\u7801 uint32\u3002 \u6240\u4ee5\u6211\u505a\u4e86\u7c7b\u4f3c\u7684\u4e8b\u60c5\uff1a<\/p>\n
func putuint32(b []byte, v uint32) {\n    _ = b[3] \/\/ early check\n    b[0] = byte(v)\n    b[1] = byte(v >> 8)\n    b[2] = byte(v >> 16)\n    b[3] = byte(v >> 24)\n} \/\/ assume it's littleendian\n\n\/\/ to store packet length into buffer.\nputuint32(buffer, pkt.length)<\/pre>\n
\u60a8\u53ef\u4ee5\u4ee5\u4e0d\u5b89\u5168\u7684\u65b9\u5f0f\u6267\u884c\u4e0e c\/c++ \u76f8\u540c\u7684\u64cd\u4f5c\u3002<\/p>\n
\u53ea\u9700\u4f7f\u7528\u8d85\u5927\u7684\u56fa\u5b9a\u5bbd\u5ea6\u5b57\u8282\u6570\u7ec4\u5373\u53ef\u3002<\/p>\n
\u8bdd\u867d\u5982\u6b64\uff0c\u60a8\u9700\u8981\u8fdb\u884c\u81ea\u5df1\u7684\u8fb9\u754c\u68c0\u67e5\u3002<\/p>\n
package main\n\nimport (\n    \"unsafe\"\n    \"runtime\"\n    \"reflect\"\n    \"fmt\"\n)\n\ntype Packet struct {\n    length  uint32     \/\/ alignment 4\n    nameLen uint8      \/\/ alignment 1\n    data    [2048]byte \/\/ alignment 1\n}\n\nfunc NewPacketFromBuffer(buffer []byte) *Packet {\n    sh := (*reflect.SliceHeader)(unsafe.Pointer(&buffer))\n    packet := (*Packet)(unsafe.Pointer(sh.Data))\n    runtime.KeepAlive(buffer) \/\/ So the buffer will not be garbage collected\n    return packet\n}\n\n\nfunc main () {\n   buffer := []byte{9,0,0,0,4,'d','a','t','a'};\n   p := NewPacketFromBuffer(buffer)\n   fmt.Printf(\"length : %d, nameLen : %d, name: %s\\n\", p.length, \n    p.nameLen, p.data[0:p.nameLen] )\n}<\/pre>\n
\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300agolang\u4e2d\u7684\u5bf9\u9f50\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-208299","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208299","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208299"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208299\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208299"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}