{"id":133100,"date":"2024-03-26T02:05:14","date_gmt":"2024-03-25T17:05:14","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c-%e3%83%a1%e3%83%a2%e3%83%aa-%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0%e3%81%ae%e6%8b%a1%e5%bc%b5%e4%b8%8d%e5%8f%af%e3%81%ae%e5%95%8f%e9%a1%8c%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86\/"},"modified":"2024-03-27T18:52:24","modified_gmt":"2024-03-27T09:52:24","slug":"c-%e3%83%a1%e3%83%a2%e3%83%aa-%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0%e3%81%ae%e6%8b%a1%e5%bc%b5%e4%b8%8d%e5%8f%af%e3%81%ae%e5%95%8f%e9%a1%8c%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c-%e3%83%a1%e3%83%a2%e3%83%aa-%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0%e3%81%ae%e6%8b%a1%e5%bc%b5%e4%b8%8d%e5%8f%af%e3%81%ae%e5%95%8f%e9%a1%8c%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86\/","title":{"rendered":"C# \u30e1\u30e2\u30ea \u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u62e1\u5f35\u4e0d\u53ef\u306e\u554f\u984c\u3092\u3069\u306e\u3088\u3046\u306b\u89e3\u6c7a\u3059\u308b\u304b"},"content":{"rendered":"<p>C#\u3067\u306f\u3001MemoryStream \u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u62e1\u5f35\u4e0d\u53ef\u3067\u3042\u308a\u3001\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u66f8\u304d\u8fbc\u307f\u6642\u306b\u30e1\u30e2\u30ea\u4e0d\u8db3\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306e1\u3064\u306e\u65b9\u6cd5\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30e1\u30e2\u30ea\u30b5\u30a4\u30ba\u3092\u52d5\u7684\u306b\u62e1\u5f35\u3067\u304d\u308bMemoryStream\u306e\u62e1\u5f35\u5b50\ud074\ub798\uc2a4\u3067\u3042\u308b\u3001ExpandableMemoryStream\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u3001\u62e1\u5f35\u53ef\u80fd\u306a\u30e1\u30e2\u30ea\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">ExpandableMemoryStream<\/span> : <span class=\"hljs-title\">Stream<\/span>\r\n{\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-built_in\">byte<\/span>[] buffer;\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-built_in\">int<\/span> position;\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-built_in\">int<\/span> length;\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">ExpandableMemoryStream<\/span>()<\/span>\r\n{\r\nbuffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">byte<\/span>[<span class=\"hljs-number\">4096<\/span>]; <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5927\u5c0f\u4e3a4KB<\/span>\r\nposition = <span class=\"hljs-number\">0<\/span>;\r\nlength = <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-built_in\">bool<\/span> CanRead =&gt; <span class=\"hljs-literal\">true<\/span>;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-built_in\">bool<\/span> CanSeek =&gt; <span class=\"hljs-literal\">true<\/span>;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-built_in\">bool<\/span> CanWrite =&gt; <span class=\"hljs-literal\">true<\/span>;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-built_in\">long<\/span> Length =&gt; length;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-built_in\">long<\/span> Position\r\n{\r\n<span class=\"hljs-keyword\">get<\/span> =&gt; position;\r\n<span class=\"hljs-keyword\">set<\/span> =&gt; position = (<span class=\"hljs-built_in\">int<\/span>)<span class=\"hljs-keyword\">value<\/span>;\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Flush<\/span>()<\/span>\r\n{\r\n<span class=\"hljs-comment\">\/\/ \u65e0\u9700\u5b9e\u73b0<\/span>\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-built_in\">int<\/span> <span class=\"hljs-title\">Read<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">byte<\/span>[] buffer, <span class=\"hljs-built_in\">int<\/span> offset, <span class=\"hljs-built_in\">int<\/span> count<\/span>)<\/span>\r\n{\r\n<span class=\"hljs-built_in\">int<\/span> bytesRead = Math.Min(count, length - position);\r\nArray.Copy(<span class=\"hljs-keyword\">this<\/span>.buffer, position, buffer, offset, bytesRead);\r\nposition += bytesRead;\r\n<span class=\"hljs-keyword\">return<\/span> bytesRead;\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-built_in\">long<\/span> <span class=\"hljs-title\">Seek<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">long<\/span> offset, SeekOrigin origin<\/span>)<\/span>\r\n{\r\n<span class=\"hljs-keyword\">switch<\/span> (origin)\r\n{\r\n<span class=\"hljs-keyword\">case<\/span> SeekOrigin.Begin:\r\nposition = (<span class=\"hljs-built_in\">int<\/span>)offset;\r\n<span class=\"hljs-keyword\">break<\/span>;\r\n<span class=\"hljs-keyword\">case<\/span> SeekOrigin.Current:\r\nposition += (<span class=\"hljs-built_in\">int<\/span>)offset;\r\n<span class=\"hljs-keyword\">break<\/span>;\r\n<span class=\"hljs-keyword\">case<\/span> SeekOrigin.End:\r\nposition = length - (<span class=\"hljs-built_in\">int<\/span>)offset;\r\n<span class=\"hljs-keyword\">break<\/span>;\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> position;\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">SetLength<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">long<\/span> <span class=\"hljs-keyword\">value<\/span><\/span>)<\/span>\r\n{\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-keyword\">value<\/span> &lt;= length)\r\n{\r\nlength = (<span class=\"hljs-built_in\">int<\/span>)<span class=\"hljs-keyword\">value<\/span>;\r\n<span class=\"hljs-keyword\">if<\/span> (position &gt; length)\r\nposition = length;\r\n}\r\n<span class=\"hljs-keyword\">else<\/span>\r\n{\r\n<span class=\"hljs-built_in\">int<\/span> newSize = (<span class=\"hljs-built_in\">int<\/span>)<span class=\"hljs-keyword\">value<\/span>;\r\n<span class=\"hljs-built_in\">byte<\/span>[] newBuffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">byte<\/span>[newSize];\r\nArray.Copy(buffer, newBuffer, length);\r\nbuffer = newBuffer;\r\nlength = newSize;\r\n}\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">override<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Write<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">byte<\/span>[] buffer, <span class=\"hljs-built_in\">int<\/span> offset, <span class=\"hljs-built_in\">int<\/span> count<\/span>)<\/span>\r\n{\r\n<span class=\"hljs-built_in\">int<\/span> newPosition = position + count;\r\n<span class=\"hljs-keyword\">if<\/span> (newPosition &gt; <span class=\"hljs-keyword\">this<\/span>.buffer.Length)\r\n{\r\n<span class=\"hljs-built_in\">int<\/span> newSize = Math.Max(newPosition, <span class=\"hljs-keyword\">this<\/span>.buffer.Length * <span class=\"hljs-number\">2<\/span>);\r\n<span class=\"hljs-built_in\">byte<\/span>[] newBuffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">byte<\/span>[newSize];\r\nArray.Copy(<span class=\"hljs-keyword\">this<\/span>.buffer, newBuffer, position);\r\n<span class=\"hljs-keyword\">this<\/span>.buffer = newBuffer;\r\n}\r\nArray.Copy(buffer, offset, <span class=\"hljs-keyword\">this<\/span>.buffer, position, count);\r\nposition = newPosition;\r\nlength = Math.Max(position, length);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u62e1\u5f35\u53ef\u80fd\u30e1\u30e2\u30ea \u30b9\u30c8\u30ea\u30fc\u30e0\u306f\u3001\u30e1\u30e2\u30ea \u30b9\u30c8\u30ea\u30fc\u30e0\u3068\u540c\u3058\u3088\u3046\u306b\u8aad\u307f\u66f8\u304d\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30e1\u30e2\u30ea\u4e0d\u8db3\u3092\u6c17\u306b\u305b\u305a\u306b\u6e08\u307f\u307e\u3059\u3002\u62e1\u5f35\u53ef\u80fd\u30e1\u30e2\u30ea \u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u66f8\u304d\u8fbc\u307e\u308c\u308b\u30c7\u30fc\u30bf\u91cf\u304c\u73fe\u5728\u306e\u30e1\u30e2\u30ea \u30b5\u30a4\u30ba\u3092\u8d85\u3048\u308b\u3068\u3001\u81ea\u52d5\u7684\u306b\u30e1\u30e2\u30ea \u30b5\u30a4\u30ba\u304c\u62e1\u5f35\u3055\u308c\u3066\u3001\u3055\u3089\u306b\u591a\u304f\u306e\u30c7\u30fc\u30bf\u304c\u66f8\u304d\u8fbc\u307e\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>ExpandableMemoryStream stream = <span class=\"hljs-keyword\">new<\/span> ExpandableMemoryStream();\r\n<span class=\"hljs-built_in\">byte<\/span>[] data = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">byte<\/span>[<span class=\"hljs-number\">8192<\/span>]; <span class=\"hljs-comment\">\/\/ \u5047\u8bbe\u67098KB\u6570\u636e\u9700\u8981\u5199\u5165<\/span>\r\nstream.Write(data, <span class=\"hljs-number\">0<\/span>, data.Length);\r\n<span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u6570\u636e<\/span>\r\n<span class=\"hljs-built_in\">byte<\/span>[] buffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">byte<\/span>[<span class=\"hljs-number\">4096<\/span>];\r\n<span class=\"hljs-built_in\">int<\/span> bytesRead = stream.Read(buffer, <span class=\"hljs-number\">0<\/span>, buffer.Length);\r\n<\/code><\/pre>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001C#\u306e\u30e1\u30e2\u30ea \u30b9\u30c8\u30ea\u30fc\u30e0\u304c\u62e1\u5f35\u4e0d\u53ef\u80fd\u306a\u3068\u3044\u3046\u554f\u984c\u304c\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C#\u3067\u306f\u3001MemoryStream \u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u62e1\u5f35\u4e0d\u53ef\u3067\u3042\u308a\u3001\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u66f8\u304d\u8fbc\u307f\u6642\u306b\u30e1\u30e2\u30ea\u4e0d\u8db3\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306e1\u3064\u306e\u65b9\u6cd5\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30e1\u30e2\u30ea\u30b5\u30a4\u30ba\u3092\u52d5\u7684\u306b\u62e1\u5f35\u3067\u304d\u308bMemor [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-133100","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u62e1\u5f35\u4e0d\u53ef\u3067\u3042\u308a\u3001\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u66f8\u304d\u8fbc\u307f\u6642\u306b\u30e1\u30e2\u30ea\u4e0d\u8db3\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306e1\u3064\u306e\u65b9\u6cd5\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30e1\u30e2\u30ea\u30b5\u30a4\u30ba\u3092\u52d5\u7684\u306b\u62e1\u5f35\u3067\u304d\u308bMemor [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/c-\u30e1\u30e2\u30ea-\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u62e1\u5f35\u4e0d\u53ef\u306e\u554f\u984c\u3092\u3069\u306e\u3088\u3046\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-25T17:05:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-27T09:52:24+00:00\" \/>\n<meta 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