{"id":44206,"date":"2023-04-30T06:15:02","date_gmt":"2023-12-10T18:54:31","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/go%e8%af%ad%e8%a8%80%e7%b3%bb%e7%bb%9f%e7%bc%96%e7%a8%8b\/"},"modified":"2024-04-30T01:56:42","modified_gmt":"2024-04-29T17:56:42","slug":"go%e8%af%ad%e8%a8%80%e7%b3%bb%e7%bb%9f%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/go%e8%af%ad%e8%a8%80%e7%b3%bb%e7%bb%9f%e7%bc%96%e7%a8%8b\/","title":{"rendered":"Go\u8bed\u8a00\u7cfb\u7edf\u7f16\u7a0b"},"content":{"rendered":"

\u9996\u5148<\/h2>\n

\u6211\u6b63\u5728\u5b66\u4e60\u53ef\u4ee5\u7406\u89e3Go\u7cfb\u7edf\u7f16\u7a0b\u7684\u8bfe\u7a0b\uff0c\u5e76\u5b9a\u671f\u8fdb\u884c\u5b66\u4e60\u3002<\/p>\n

\u672c\u6b21\u4f7f\u7528PNG\u56fe\u50cf\u7684tEXt\u5757\u6765\u6dfb\u52a0\u79d8\u5bc6\u6587\u672c\u3002<\/p>\n

\u203b \u8fd9\u7bc7\u7531\u6211\u64b0\u5199\u7684Qiita\u6587\u7ae0\u662f\u5bf9\u8fd9\u7bc7\u6587\u7ae0\uff08https:\/\/ascii.jp\/elem\/000\/001\/260\/1260449\/\uff09\u8fdb\u884c\u8865\u5145\u8bf4\u660e\u5e76\u6574\u7406\u6210\u6613\u4e8e\u9a8c\u8bc1\u7684\u5f62\u5f0f\u3002\u4f5c\u4e3a\u5e0c\u671b\u66f4\u6df1\u5165\u4e86\u89e3\u7684\u5efa\u8bae\uff0c\u6211\u5efa\u8bae\u60a8\u9605\u8bfbQiita\u5e76\u7406\u89e3\u5176\u6982\u5ff5\u540e\u518d\u4ed4\u7ec6\u9605\u8bfb\u539f\u59cb\u94fe\u63a5\u3002<\/p>\n

\u5171\u4eab\u8981\u505a\u7684\u4e8b\u60c5\u60f3\u6cd5 zu\u00f2 de<\/h2>\n

PNG\u56fe\u50cf\u662f\u7531\u8fd9\u6837\u7684\u5757\u6784\u6210\u7684\u3002
\n\u203b CRC\u662f\u7c7b\u4f3c\u4e8e\u5355\u5143\u6d4b\u8bd5\u7684\u5757\u3002<\/p>\n

\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n

\u901a\u8fc7\u4f7f\u7528tEXt\u5757\u5c06\u79d8\u5bc6\u6587\u672c\u6dfb\u52a0\u5230PNG\u56fe\u50cf\u4e2d\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u56fe\u50cf\u793a\u4f8b\u8fdb\u884c\u6dfb\u52a0\u3002<\/p>\n

\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n

\u663e\u793aPNG\u6587\u4ef6\u7684\u5757\u5904\u7406<\/h2>\n

\u4ee5\u4e0b\u662f\u663e\u793aPNG\u6587\u4ef6\u5757\u7684\u5904\u7406\u65b9\u6cd5\u3002\u5728\u8fd9\u91cc\u51c6\u5907\u4e00\u5f20PNG\u56fe\u50cf\uff08\u5728\u672c\u6587\u4e2d\u4e3aFuga.png\uff09\uff0c\u7136\u540e\u6267\u884c\u8fd9\u4e2a\u5904\u7406\u8fc7\u7a0b\u3002<\/p>\n

\r\npackage<\/span> main<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"encoding\/binary\"<\/span>\r\n    \"fmt\"<\/span>\r\n    \"io\"<\/span>\r\n    \"os\"<\/span>\r\n    \"bytes\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> dumpChunk<\/span>(<\/span>chunk<\/span> io<\/span>.<\/span>Reader<\/span>)<\/span> {<\/span>\r\n    var<\/span> length<\/span> int32<\/span>\r\n    binary<\/span>.<\/span>Read<\/span>(<\/span>chunk<\/span>,<\/span> binary<\/span>.<\/span>BigEndian<\/span>,<\/span> &<\/span>length<\/span>)<\/span>\r\n    buffer<\/span> :=<\/span> make<\/span>([]<\/span>byte<\/span>,<\/span> 4<\/span>)<\/span>\r\n    chunk<\/span>.<\/span>Read<\/span>(<\/span>buffer<\/span>)<\/span>\r\n    fmt<\/span>.<\/span>Printf<\/span>(<\/span>\"chunk '%v' (%d bytes)<\/span>\\n<\/span>\"<\/span>,<\/span> string<\/span>(<\/span>buffer<\/span>),<\/span> length<\/span>)<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> readChunks<\/span>(<\/span>file<\/span> *<\/span>os<\/span>.<\/span>File<\/span>)<\/span> []<\/span>io<\/span>.<\/span>Reader<\/span> {<\/span>\r\n    \/\/ \u30c1\u30e3\u30f3\u30af\u3092\u683c\u7d0d\u3059\u308b\u914d\u5217<\/span>\r\n    var<\/span> chunks<\/span> []<\/span>io<\/span>.<\/span>Reader<\/span>\r\n\r\n    \/\/ \u6700\u521d\u306e8\u30d0\u30a4\u30c8\u3092\u98db\u3070\u3059<\/span>\r\n    file<\/span>.<\/span>Seek<\/span>(<\/span>8<\/span>,<\/span> 0<\/span>)<\/span>\r\n    var<\/span> offset<\/span> int64<\/span> =<\/span> 8<\/span>\r\n\r\n    for<\/span> {<\/span>\r\n        var<\/span> length<\/span> int32<\/span>\r\n        err<\/span> :=<\/span> binary<\/span>.<\/span>Read<\/span>(<\/span>file<\/span>,<\/span> binary<\/span>.<\/span>BigEndian<\/span>,<\/span> &<\/span>length<\/span>)<\/span>\r\n        if<\/span> err<\/span> ==<\/span> io<\/span>.<\/span>EOF<\/span> {<\/span>\r\n            break<\/span>\r\n        }<\/span>\r\n        chunks<\/span> =<\/span> append<\/span>(<\/span>chunks<\/span>,<\/span> io<\/span>.<\/span>NewSectionReader<\/span>(<\/span>file<\/span>,<\/span> offset<\/span>,<\/span> int64<\/span>(<\/span>length<\/span>)<\/span>+<\/span>12<\/span>))<\/span>\r\n        \/\/ \u6b21\u306e\u30c1\u30e3\u30f3\u30af\u306e\u5148\u982d\u306b\u79fb\u52d5<\/span>\r\n        \/\/ \u73fe\u5728\u4f4d\u7f6e\u306f\u9577\u3055\u3092\u8aad\u307f\u7d42\u308f\u3063\u305f\u7b87\u6240\u306a\u306e\u3067<\/span>\r\n        \/\/ \u30c1\u30e3\u30f3\u30af\u540d(4\u30d0\u30a4\u30c8) + \u30c7\u30fc\u30bf\u9577 + CRC(4\u30d0\u30a4\u30c8)\u5148\u306b\u79fb\u52d5<\/span>\r\n        offset<\/span>,<\/span> _<\/span> =<\/span> file<\/span>.<\/span>Seek<\/span>(<\/span>int64<\/span>(<\/span>length<\/span>+<\/span>8<\/span>),<\/span> 1<\/span>)<\/span>\r\n    }<\/span>\r\n    return<\/span> chunks<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> main<\/span>()<\/span> {<\/span>\r\n    file<\/span>,<\/span> err<\/span> :=<\/span> os<\/span>.<\/span>Open<\/span>(<\/span>\"Fuga.png\"<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        panic<\/span>(<\/span>err<\/span>)<\/span>\r\n    }<\/span>\r\n    chunks<\/span> :=<\/span> readChunks<\/span>(<\/span>file<\/span>)<\/span>\r\n    for<\/span> _<\/span>,<\/span> chunk<\/span> :=<\/span> range<\/span> chunks<\/span> {<\/span>\r\n        dumpChunk<\/span>(<\/span>chunk<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\u7ed3\u679c<\/p>\n
$ go run displayChunk.go\r\nchunk 'IHDR' (13 bytes)\r\nchunk 'tIME' (7 bytes)\r\nchunk 'pHYs' (9 bytes)\r\nchunk 'gAMA' (4 bytes)\r\nchunk 'IDAT' (63773 bytes)\r\nchunk 'IEND' (0 bytes)\r\n<\/code><\/pre>\n
\u5c06PNG\u56fe\u50cf\u5206\u89e3\u6210\u5757\uff0c\u4ee5\u6dfb\u52a0\u79d8\u5bc6\u6587\u672c\u4e3a\u5904\u7406\u3002<\/h2>\n
\r\npackage<\/span> main<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"encoding\/binary\"<\/span>\r\n    \"fmt\"<\/span>\r\n    \"io\"<\/span>\r\n    \"os\"<\/span>\r\n    \"hash\/crc32\"<\/span>\r\n    \"bytes\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> textChunk<\/span>(<\/span>text<\/span> string<\/span>)<\/span> io<\/span>.<\/span>Reader<\/span> {<\/span>\r\n    byteData<\/span> :=<\/span> []<\/span>byte<\/span>(<\/span>text<\/span>)<\/span>\r\n    var<\/span> buffer<\/span> bytes<\/span>.<\/span>Buffer<\/span>\r\n    binary<\/span>.<\/span>Write<\/span>(<\/span>&<\/span>buffer<\/span>,<\/span> binary<\/span>.<\/span>BigEndian<\/span>,<\/span> int32<\/span>(<\/span>len<\/span>(<\/span>byteData<\/span>)))<\/span>\r\n    buffer<\/span>.<\/span>WriteString<\/span>(<\/span>\"tEXt\"<\/span>)<\/span>\r\n    buffer<\/span>.<\/span>Write<\/span>(<\/span>byteData<\/span>)<\/span>\r\n    \/\/ CRC\u3092\u8a08\u7b97\u3057\u3066\u8ffd\u52a0<\/span>\r\n    crc<\/span> :=<\/span> crc32<\/span>.<\/span>NewIEEE<\/span>()<\/span>\r\n    io<\/span>.<\/span>WriteString<\/span>(<\/span>crc<\/span>,<\/span> \"tEXt\"<\/span>)<\/span>\r\n    binary<\/span>.<\/span>Write<\/span>(<\/span>&<\/span>buffer<\/span>,<\/span> binary<\/span>.<\/span>BigEndian<\/span>,<\/span> crc<\/span>.<\/span>Sum32<\/span>())<\/span>\r\n    return<\/span> &<\/span>buffer<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> dumpChunk<\/span>(<\/span>chunk<\/span> io<\/span>.<\/span>Reader<\/span>)<\/span> {<\/span>\r\n    var<\/span> length<\/span> int32<\/span>\r\n    binary<\/span>.<\/span>Read<\/span>(<\/span>chunk<\/span>,<\/span> binary<\/span>.<\/span>BigEndian<\/span>,<\/span> &<\/span>length<\/span>)<\/span>\r\n    buffer<\/span> :=<\/span> make<\/span>([]<\/span>byte<\/span>,<\/span> 4<\/span>)<\/span>\r\n    chunk<\/span>.<\/span>Read<\/span>(<\/span>buffer<\/span>)<\/span>\r\n    fmt<\/span>.<\/span>Printf<\/span>(<\/span>\"chunk '%v' (%d bytes)<\/span>\\n<\/span>\"<\/span>,<\/span> string<\/span>(<\/span>buffer<\/span>),<\/span> length<\/span>)<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> readChunks<\/span>(<\/span>file<\/span> *<\/span>os<\/span>.<\/span>File<\/span>)<\/span> []<\/span>io<\/span>.<\/span>Reader<\/span> {<\/span>\r\n    \/\/ \u30c1\u30e3\u30f3\u30af\u3092\u683c\u7d0d\u3059\u308b\u914d\u5217<\/span>\r\n    var<\/span> chunks<\/span> []<\/span>io<\/span>.<\/span>Reader<\/span>\r\n\r\n    \/\/ \u6700\u521d\u306e8\u30d0\u30a4\u30c8\u3092\u98db\u3070\u3059<\/span>\r\n    file<\/span>.<\/span>Seek<\/span>(<\/span>8<\/span>,<\/span> 0<\/span>)<\/span>\r\n    var<\/span> offset<\/span> int64<\/span> =<\/span> 8<\/span>\r\n\r\n    for<\/span> {<\/span>\r\n        var<\/span> length<\/span> int32<\/span>\r\n        err<\/span> :=<\/span> binary<\/span>.<\/span>Read<\/span>(<\/span>file<\/span>,<\/span> binary<\/span>.<\/span>BigEndian<\/span>,<\/span> &<\/span>length<\/span>)<\/span>\r\n        if<\/span> err<\/span> ==<\/span> io<\/span>.<\/span>EOF<\/span> {<\/span>\r\n            break<\/span>\r\n        }<\/span>\r\n        chunks<\/span> =<\/span> append<\/span>(<\/span>chunks<\/span>,<\/span> io<\/span>.<\/span>NewSectionReader<\/span>(<\/span>file<\/span>,<\/span> offset<\/span>,<\/span> int64<\/span>(<\/span>length<\/span>)<\/span>+<\/span>12<\/span>))<\/span>\r\n        \/\/ \u6b21\u306e\u30c1\u30e3\u30f3\u30af\u306e\u5148\u982d\u306b\u79fb\u52d5<\/span>\r\n        \/\/ \u73fe\u5728\u4f4d\u7f6e\u306f\u9577\u3055\u3092\u8aad\u307f\u7d42\u308f\u3063\u305f\u7b87\u6240\u306a\u306e\u3067<\/span>\r\n        \/\/ \u30c1\u30e3\u30f3\u30af\u540d(4\u30d0\u30a4\u30c8) + \u30c7\u30fc\u30bf\u9577 + CRC(4\u30d0\u30a4\u30c8)\u5148\u306b\u79fb\u52d5<\/span>\r\n        offset<\/span>,<\/span> _<\/span> =<\/span> file<\/span>.<\/span>Seek<\/span>(<\/span>int64<\/span>(<\/span>length<\/span>+<\/span>8<\/span>),<\/span> 1<\/span>)<\/span>\r\n    }<\/span>\r\n    return<\/span> chunks<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> main<\/span>()<\/span> {<\/span>\r\n    file<\/span>,<\/span> err<\/span> :=<\/span> os<\/span>.<\/span>Open<\/span>(<\/span>\"Fuga.png\"<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        panic<\/span>(<\/span>err<\/span>)<\/span>\r\n    }<\/span>\r\n    defer<\/span> file<\/span>.<\/span>Close<\/span>()<\/span>\r\n    newFile<\/span>,<\/span> err<\/span> :=<\/span> os<\/span>.<\/span>Create<\/span>(<\/span>\"FugaX.png\"<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        panic<\/span>(<\/span>err<\/span>)<\/span>\r\n    }<\/span>\r\n    defer<\/span> newFile<\/span>.<\/span>Close<\/span>()<\/span>\r\n    chunks<\/span> :=<\/span> readChunks<\/span>(<\/span>file<\/span>)<\/span>\r\n    \/\/ \u30b7\u30b0\u30cb\u30c1\u30e3\u66f8\u304d\u8fbc\u307f<\/span>\r\n    io<\/span>.<\/span>WriteString<\/span>(<\/span>newFile<\/span>,<\/span> \"<\/span>\\x89<\/span>PNG<\/span>\\r\\n\\x1a\\n<\/span>\"<\/span>)<\/span>\r\n    \/\/ \u5148\u982d\u306b\u5fc5\u8981\u306aIHDR\u30c1\u30e3\u30f3\u30af\u3092\u66f8\u304d\u8fbc\u307f<\/span>\r\n    io<\/span>.<\/span>Copy<\/span>(<\/span>newFile<\/span>,<\/span> chunks<\/span>[<\/span>0<\/span>])<\/span>\r\n    \/\/ \u30c6\u30ad\u30b9\u30c8\u30c1\u30e3\u30f3\u30af\u3092\u8ffd\u52a0<\/span>\r\n    io<\/span>.<\/span>Copy<\/span>(<\/span>newFile<\/span>,<\/span> textChunk<\/span>(<\/span>\"\u79d8\u5bc6\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\"<\/span>))<\/span>\r\n    \/\/ \u6b8b\u308a\u306e\u30c1\u30e3\u30f3\u30af\u3092\u8ffd\u52a0<\/span>\r\n    for<\/span> _<\/span>,<\/span> chunk<\/span> :=<\/span> range<\/span> chunks<\/span>[<\/span>1<\/span>:<\/span>]<\/span> {<\/span>\r\n        io<\/span>.<\/span>Copy<\/span>(<\/span>newFile<\/span>,<\/span> chunk<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6267\u884caddTextChunk.go\u540e\uff0c\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684PNG\u56fe\u50cf\uff08FugaX.png\uff09\uff0c\u5176\u4e2d\u63d2\u5165\u4e86\u4e00\u6bb5\u79d8\u5bc6\u7684\u6587\u672c\u3002<\/p>\n
\u663e\u793a\u5904\u7406\u7684\u662f\u5177\u6709\u65b0\u7684PNG\u56fe\u7247\u5757\u7ed3\u6784\u7684\u6dfb\u52a0\u4e86\u79d8\u5bc6\u6587\u672c\u7684\u6587\u4ef6\u3002<\/h2>\n
\u9996\u5148\uff0c\u6211\u5011\u5c07\u539f\u5148\u57f7\u884c\u7684displayChunk.go\u9032\u884c\u4ee5\u4e0b\u66f4\u6539\u3002<\/p>\n
    \n
  • \n
      \u6307\u5b9aPNG\u753b\u50cf\u3092Fuga.png\u304b\u3089FugaX.png\u306b\u5909\u66f4<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \u79d8\u5bc6\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u4ee5\u4e0b\u306e\u51e6\u7406\u3092dumpChunk()\u306b\u8ffd\u52a0\u3059\u308b\u3002<\/ul>\n
        if<\/span> bytes<\/span>.<\/span>Equal<\/span>(<\/span>buffer<\/span>,<\/span> []<\/span>byte<\/span>(<\/span>\"tEXt\"<\/span>))<\/span> {<\/span>\r\n    rawText<\/span> :=<\/span> make<\/span>([]<\/span>byte<\/span>,<\/span> length<\/span>)<\/span>\r\n    chunk<\/span>.<\/span>Read<\/span>(<\/span>rawText<\/span>)<\/span>\r\n    fmt<\/span>.<\/span>Println<\/span>(<\/span>string<\/span>(<\/span>rawText<\/span>))<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u6211\u4eec\u8f93\u5165\u547d\u4ee4\uff0c\u5c1d\u8bd5\u6267\u884cdisplayChunk.go\uff01<\/p>\n
        $ go run displayChunk.go\r\nchunk 'IHDR' (13 bytes)\r\nchunk 'tEXt' (24 bytes)\r\n\u79d8\u5bc6\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\r\nchunk 'tIME' (7 bytes)\r\nchunk 'pHYs' (9 bytes)\r\nchunk 'gAMA' (4 bytes)\r\nchunk 'IDAT' (63773 bytes)\r\nchunk 'IEND' (0 bytes)\r\n<\/code><\/pre>\n
        \u6211\u6210\u529f\u67e5\u770b\u4e86\u79d8\u5bc6\u4fe1\u606f\uff01<\/p>\n
        \u8bf7\u52a1\u5fc5\u5c1d\u8bd5\u5728\u8fd9\u6837\u7684\u611f\u89c9\u4e2d\u63d2\u5165\u79d8\u5bc6\u6587\u7ae0\uff0c\u8bd5\u8bd5\u770b\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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