lwip嵌入式的web服务器的外文翻译

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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