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页数:42页
时间:2018-04-27
《lwip嵌入式的web服务器的外文翻译》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2011届毕业设计外文翻译毕业设计题目基于LWIP的嵌入式WEB服务器的设计与实现外文翻译题目DesignandImplementtationofTheLWIPTCP/IPStack专业通信工程班级姓名学号指导教师职称评分指标翻译工作量1.饱满2.较饱满3.一般4.较差译文质量1.好2.较好3.一般4.较差指导教师意见签名:得分:日期:评阅教师意见签名:得分:日期:DesignandImplementationofthelwIPTCP/IPStack42SwedishInstituteofComputerScienceFebruary20,2001AdamDunkelsadam@sics.se
2、1APIreference1.1DatatypesTherearetwodatatypesthatareusedforthelwIPAPI.Thesearenetbuf,thenetworkbufferabstraction,andnetconn,theabstractionofanetworkconnection.EachdatatypeisrepressentedasapointertoaCstruct.Knowledgeoftheinternalstructureofthestructshouldnotbeusedinapplicationprograms.Instead,theAPIp
3、rovidesfunctionsformodifyingandextractingnecessaryfields.1.1.1NetbufsNetbufsarebuffersthatareusedforsendingandreceivingdata.Internally,anetbufisassociatedwithapbufaspresentedinSection6.1.Netbufscan,justaspbufs,accomodatebothallocatedmemoryandreferencedmemory.AllocatedmemoryisRAMthatisexplicitlyalloc
4、atedforholdingnetworkdata,whereasreferencedmemorymightbeeitherapplicationmanagedRAMorexternalROM.Referencedmemoryisusefulforsendingdatathatisnotmodi¯ed,suchasstaticwebpagesorimages.Thedatainanetbufcanbefragmentedintodifferenlysizedblocks.Thismeansthatanapplicationmustbepreparedtoacceptfragmenteddata
5、.Internally,anetbufhasapointertooneofthefragmentsinthenetbuf.Twofunctions,netbuf_next()andnetbuf_first()areusedtomanipulatethispointer.NetbufsthathavebeenreceivedfromthenetworkalsocontaintheIPaddressandportnumberoftheoriginatorofthepacket.Functionsforextractingthosevaluesexist.1.2Bufferfunctions1.2.
6、1netbufnew()Synopsisstructnetbuf*netbufnew(void)DescriptionAllocatesanetbufstructure.Nobufferspaceisallocatedwhendoingthis,onlythetoplevelstructure.Afteruse,thenetbufmustbedeallocatedwithnetbuf_delete().1.2.2netbufdelete()Synopsisvoidnetbufdelete(structnetbuf*)DescriptionDeallocatesanetbufstructurep
7、revioslyallocatedbyacalltothenetbuf_new()function.Anybuffermemoryallocatedtothenetbufbycallstonetbuf_alloc()isalsodeallocated.ExampleThisexampleshowsthebasicmechanismsforusingnetbufs.intmain(){structn
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