[原创]使用hash匹配mime。
我错了，向伟大的技术道歉。
先看一段网上的mime匹配代码，接下来我们对这段代码稍微的优化一下。
const char *get_mime_type(const char *name) {
char *ext = strrchr((char*)name, '.');
if (!ext)
return NULL;
if (strcmp(ext, ".html") == 0 || strcmp(ext, ".htm") == 0)
return "text/html";
if (strcmp(ext, ".jpg") == 0 || strcmp(ext, ".jpeg") == 0)
return "image/jpeg";
if (strcmp(ext, ".gif") == 0)
return "image/gif";
if (strcmp(ext, ".png") == 0)
return "image/png";
if (strcmp(ext, ".css") == 0)
return "text/css";
if (strcmp(ext, ".au") == 0)
return "audio/basic";
if (strcmp(ext, ".wav") == 0)
return "audio/wav";
if (strcmp(ext, ".avi") == 0)
return "video/x-msvideo";
if (strcmp(ext, ".mpeg") == 0 || strcmp(ext, ".mpg") == 0)
return "video/mpeg";
if (strcmp(ext, ".mp3") == 0)
return "audio/mpeg";
return NULL;
}下面这段代码是根据hash来匹配mime原型，请看大屏幕。
namespace vws {
const char* vws_http_mime::get_ext_name(const char* filename) {
const char* ext = strrchr(filename, '.');
if (!ext) {
return (char*) 0;
} else {
return ext;
}
}
const char* vws_http_mime::to_lower_string(const char* string) {
static char full[PATH_MAX];
int i = 0;
for (i = 0; *string; i++) {
full[i] = tolower(*string++);
}
full[i] = 0;
return full;
}
const char* vws_http_mime::find_ext_name_mime(const char* filename) {
const char* ext = vws_http_mime::get_ext_name(filename);
const char* ext_low = vws_http_mime::to_lower_string(ext);
unsigned long value = vws_crc32::calculate((unsigned char*) ext_low,
strlen(ext_low));
if (sizeof(value) == 8) // 64 bit
{
value &= 0x00000000ffffffff;
}
switch (value) {
case 0x81ee4181:
case 0x5f3d3c9e:
case 0x0b2b7803:
return ("text/html");
case 0xe62678db:
return ("text/css");
case 0xaf1c0660:
return ("text/xml");
case 0x3cdfce37:
return ("image/gif");
case 0x73e57256:
case 0xd800c4ea:
return ("image/jpeg");
case 0x9b8c1153:
return ("application/x-javascript");
case 0xb9d75c1f:
return ("application/atom+xml");
case 0xfbc2b19c:
return ("application/rss+xml");
case 0xb5f167fb:
return ("text/mathml");
case 0x82df8146:
return ("text/plain");
case 0x12d0b640:
return ("text/vnd.sun.j2me.app-descriptor");
case 0xa440415d:
return ("text/vnd.wap.wml");
case 0xb8851199:
return ("text/x-component");
case 0x1df0dd93:
return ("image/png");
case 0x22bfd31e:
case 0x8cfea950:
return ("image/tiff");
case 0x853e85c5:
return ("image/vnd.wap.wbmp");
case 0xb572b313:
return ("image/x-icon");
case 0x0c41fb35:
return ("image/x-jng");
case 0xaaac7c89:
return ("image/x-ms-bmp");
case 0x9dadfb93:
case 0x0b4918aa:
return ("image/svg+xml");
case 0x07e98f8f:
return ("image/webp");
case 0xe6040311:
case 0xf2fa3332:
case 0xed58442c:
return ("application/java-archive");
case 0x4f972c30:
return ("application/mac-binhex40");
case 0x18a92367:
return ("application/msword");
case 0x9018058f:
return ("application/pdf");
case 0x2ba1eb88:
case 0xc98657aa:
case 0x851a31e2:
return ("application/postscript");
case 0xd95ec3b0:
return ("application/rtf");
case 0x3b0f3ad4:
return ("application/vnd.ms-excel");
case 0x4d0fa392:
return ("application/vnd.ms-powerpoint");
case 0x13c7b267:
return ("application/vnd.wap.wmlc");
case 0xb17c1b49:
return ("application/vnd.google-earth.kml+xml");
case 0x45a8ae18:
return ("application/vnd.google-earth.kmz");
case 0xed458aee:
return ("application/x-7z-compressed");
case 0xb8e536c5:
return ("application/x-cocoa");
case 0x82964b41:
return ("application/x-java-archive-diff");
case 0x374cc2a2:
return ("application/x-java-jnlp-file");
case 0xce9e7ac3:
return ("application/x-makeself");
case 0xa6a9e67d:
case 0xd1aed6eb:
return ("application/x-perl");
case 0xfcea44d7:
case 0x9775c196:
return ("application/x-pilot");
case 0xf431f1d9:
return ("application/x-rar-compressed");
case 0x2ae0df3c:
return ("application/x-redhat-package-manager");
case 0x15211f34:
return ("application/x-sea");
case 0xf3b1fa44:
return ("application/x-shockwave-flash");
case 0xd449b4d3:
return ("application/x-stuffit");
case 0x3885d28a:
case 0x5ca1b6da:
return ("application/x-tcl");
case 0x88f6eb1f:
case 0x1ed1ed46:
case 0x6159dc39:
return ("application/x-x509-ca-cert");
case 0x201a9ef3:
return ("application/x-xpinstall");
case 0x7cfb4912:
return ("application/xhtml+xml");
case 0xdcf54b45:
return ("application/zip");
case 0x34cf84ee:
case 0xf58b68f3:
case 0xa33b6d35:
return ("application/octet-stream");
case 0x9541fb7b:
return ("application/octet-stream");
case 0x2df285fc:
return ("application/octet-stream");
case 0x9ab8cc97:
return ("application/octet-stream");
case 0xffb0a142:
case 0x252a16af:
return ("application/octet-stream");
case 0x11daacab:
case 0x75b1046b:
case 0x16b768b2:
return ("application/octet-stream");
case 0xdf462acd:
case 0x0366ce56:
case 0xe7c66926:
return ("audio/midi");
case 0xb1494782:
return ("audio/mpeg");
case 0xdb488297:
return ("audio/ogg");
case 0xa039fd5b:
return ("audio/x-m4a");
case 0xea2ef842:
return ("audio/x-realaudio");
case 0x68efe458:
case 0x3d3dd084:
return ("video/3gpp");
case 0x2f2dd221:
return ("video/mp4");
case 0xee324aef:
case 0xdd4fd26f:
return ("video/mpeg");
case 0x7aa5fc03:
return ("video/quicktime");
case 0x64efe356:
return ("video/webm");
case 0x5ddd4021:
return ("video/x-flv");
case 0x23ea789c:
return ("video/x-m4v");
case 0x090eedb0:
return ("video/x-mng");
case 0x7270753d:
case 0x887f485e:
return ("video/x-ms-asf");
case 0x5922b827:
return ("video/x-ms-wmv");
case 0x65b7a18a:
return ("video/x-msvideo");
default:
break;
}
return ("text/unknown");
}
}讲解完毕，谢谢观看。
