2246 lines
688 KiB
Plaintext
2246 lines
688 KiB
Plaintext
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rust
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¥¾
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#rustc 1.93.0 (254b59607 2026-01-19)Á“õ…·fÊvŠ ¦%g- -c48c539199cbc88bÁ ³VOÐêùÿ²?ÑL¼�§Ì± -a7a40eb546f9e2b0Á á\ƒ¦è3$|]åŒ[IÚ tæ -14b12edc9f8cd90bÁ ë&Gf·Ã ¬ëñq:¤»b -bb76018b1173caf6Áà 9m Ù„«ÐÒþá•c‘B; -030c5b0bba47cc8fÁ rustc_std_workspace_coreÁÛ¹þÓ7>H%¸ÚÉ’› -4b81d37a5530864dÁ üÃùs<Uß7VyóHr#QÏ -c66cc7807550ce25Á miniz_oxideÁõFÖˆÚ™ª‹"ÞXzLVª -62cbc7af83058505Á adler2Á—wÉD‘嵯�|6¨%Œ
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+ -2f171dd2394b4b62Á hashbrownÁ,ïcV¼¨ø¢:Ê\'È߈ -9571ba9e0f6c7a90Á rustc_std_workspace_allocÁ%¥Èxµù·¼5Ä3Bœ -aac566ad65903fa4Á
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std_detectÁMmáýZ^9õ Îà§e˜÷e -2edb296e590136d8Á rustc_demangleÁ@¼§VÉNb˜æ¨fHÌ+V3 -53b132e4a2fa6e26Á cfg_ifÁfÝv�.Å"ÒÜuPp¹ˆ¶ -f76b385d7d4d7f3eÁ addr2lineÁÕú-WiúQVÓ¬
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µT§�5 -fe25100bd73e48e4Á gimliÁ¹xLáÇí÷‘o ±Ñ8£Å -265ba9e6e4f70b3fÁ objectÁÔ³ÝzÓÿ¶ò°öM›¼òü` -9ae0d1f8ea52a318Á memchrÁRÎ÷׎™te~QÓ¿ØC\Ò -0bff3c8e8f4e489eÁ –©H�tGNÏ ·ˆ!á -d69228d077d46f36Á pin_project_liteÁÚŠ4&4 òÿc@tõ7 -db32293784ddc45eÁ futures_sinkÁ“œb@a›×¡ºÛ† Ë -fb30fa82a656cffdÁ tokioÁQ2
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û
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’<YVÁÀKËú -fd7552a846e1f3d2Á parking_lotÁåÖ1BaŸ+Pi[]%Óœ -a884bf84cf7b81c5Á lock_apiÁ&¬9AÔGò
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e &ê -0505e0f5062627a1Á
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scopeguardÁ Âå|A}=ÝU \`ð.j -f245d02bea2a9ebfÁ parking_lot_coreÁ) ×}uF�¹Øi�³ì7r$ -ee32c1951ba27358Á smallvecÁTc}@^©+í©f5 <¿n -445f50e307365817Á ®M1XÃßÏ“¡ÂØ_ùШ -7228978f4fcb9234Á à M•’µ\ÇMÏvâr¾O -93287e1189e2c543Á mioÁ «�f]?4_¾² y²lëû -6079e3ed32f34928Á bytesÁ,›Ž)6 ¤ÜÛÙ¿‘¿Bµ -4c247c0d324eebb2Á tokio_macrosÁ™¹xÌë]YKÖ|ìà_Ã= -716ccf1df6c7cd94Á socket2Á¢ü^ã '[ô¦`°Ûù -210b0fca2d2d8af2Á signal_hook_registryÁÀ×R÷v¯\°¦?�‡[e -ec1129e13ac204b5Á errnoÁÍk2ß6£}€æT} ê)/ -863fc617297c3a20Á futures_coreÁ>å¸d¶·°Å8w"Ÿí½1 -a156f460ce9de6faÁ I Ê à$œ Ë,Ï à ÌTÖ à( +- taskÁ$æ¶<Íñ
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$×tÍ testsÁ,öà$ë ¬ð,“/à$ü. udpÁ ʶ8Fã netÁ(FíxFã ´ Û¶$´ compatÁ4ý¶8G˜ß@G¢�G˜� read_arcÁDò¶8Q¬ io-utilÁHQ¶˜Q¬� read_exact_arcÁt˜¶7 -*,� sync_bridgeÁ\±¶[ QNP� SyncIoBridgeÁdݶ€ vsu contextÁ<»¶8RŠ ñ
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R” pRŠ timeÁ$…¶8S× Ï0Sá €S× è poll_proceedÁd€¶8úŠ ñ
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ú” púŠ “ ¢ cfg_codecÁ
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cfg_compatÁ cfg_netÁ cfg_ioÁ cfg_rtÁ
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cfg_not_rtÁ cfg_timeÁ loomÁ Â Â cancellation_tokenÁ guardÁ disarmÁ ² guard_refÁ 'aÁ û ² tree_nodeÁ TreeNodeÁ % innerÁ % wakerÁ (• ( notifiedÁ InnerÁ + parentÁ +
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parent_idxÁ + childrenÁ + is_cancelledÁ + num_handlesÁ à
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child_nodeÁ disconnect_childrenÁ with_locked_node_and_parentÁ 4 FÁ 4 RetÁ 4 move_children_to_parentÁ remove_childÁ increase_handle_refcountÁ decrease_handle_refcountÁ ; cancelÁ CancellationTokenÁ Hõ LÍ NÈ P² R> T• T child_tokenÁ Tâ Tà T cancelledÁ T cancelled_ownedÁ T
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drop_guardÁ T drop_guard_refÁ T run_until_cancelledÁ ]Ù ] ] T run_until_cancelled_ownedÁ aÙ a a e« eÍ h« hØ hÄ lÍ
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n• n
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new_futureÁ qØ qÄ t« tÙ t•
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x« xÙ xØ xÄ }Ù }Ø }Ä �Ù �• mpscÁ � ��������� �
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� ™™ ™
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into_innerÁ �œ™ œÍ �Ÿ™ � make_acquire_futureÁ ¡™ ¡ ¡ ¤ � InnerFutureÁ ¦« ¦™ �©™ © emptyÁ « �™ • Ä setÁ �²™ ²• ²
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take_stateÁ ² poll_reserveÁ ² send_itemÁ ² is_closedÁ ² get_refÁ ² closeÁ ²
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abort_sendÁ �¼™ ¼È �¿™ ¿” ¿
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poll_readyÁ ¿
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poll_flushÁ ¿
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start_sendÁ ¿
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poll_closeÁ
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poll_semaphoreÁ É ÉÉÉÉÉÉÉÉÉ É
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É É É
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É
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PollSemaphoreÁ Ø semaphoreÁ Ø
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permit_futÁ É Û• Û² Û clone_innerÁ Ûö Û poll_acquireÁ Û poll_acquire_manyÁ Û available_permitsÁ Û add_permitsÁ Éä½ äÅ ÉçÈ ÉéÍ Éë† reusable_boxÁ î îîîîîîîîî î
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î î î ReusableBoxFutureÁ ü« ü™ ü boxedÁ î €« €™ €• ƒÙ €» …Ù € try_setÁ ‡Ù ‡ real_try_setÁ ‰« ‰Ù ‰ € get_pinÁ €Ä î�™ �Ø �Ä î“™ î•™ •Í î
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reuse_pin_boxÁ ˜™ ˜ UÁ ˜ OÁ ˜Ù ˜ î
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CallOnDropÁ ž¦& žÙ žþ & ¢Ù ¢• ¢’ & §Ù §²
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eitherÁ ¬ ¬¬¬¬¬¬¬¬¬ ¬
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¬ ¬ ¬
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¬
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delegate_callÁ ¬ ¼ LÁ ¼ RÁ ¼¦& ¼Ø ¼Ä ¬Â™( ¢(  poll_readÁ ¬Æ™( Æ¢( Æ
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poll_fill_bufÁ Æ consumeÁ ¬Ë™( Ë¢( Ë
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start_seekÁ Ë
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poll_completeÁ ¬Ð™( Т( Ð
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poll_writeÁ Ð� Ð
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poll_shutdownÁ Ð poll_write_vectoredÁ Ð is_write_vectoredÁ ¬Ø™( Ø¢( ؽ ØÅ ¬Ý™( Ý¢( ݽ Ý” Ý”Ýû ÝŸ Ý� ݱ utilÁ è maybe_danglingÁ é éééééé
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MaybeDanglingÁ ð
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ð™ ðì é ô™ ô² é÷™ ÷• éúÙ úØ úÄ ý è poll_bufÁ ÿ ÿÿÿÿÿÿÿÿÿ ÿ
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ÿ ÿ ÿ
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ÿÿ
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poll_read_bufÁ �™ � BÁ ÿ poll_write_bufÁ ’™ ’ù- ’ MAX_BUFSÁ ’ è èèè „ › with_cancellation_tokenÁ œ œœœœœœœœœ œ
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œ ¨« ¨Ù ¨• « œ« Ù Ø Ä œ²Ù ²• ´ œ¶Ù ¶Ø ¶Ä › ››››› FutureExtÁ ¿Ø. ¿ with_cancellation_token_ownedÁ › ™ cfg_io_utilÁ tracingÁ Å traceÁ codecÁ Ç bytes_codecÁ È ÈÈÈÈÈÈÈ Ð• ÈÒ½ Ò” Òï ÈÖ” ÖÎ ÈÙ” ÙÎ Ç Ç decoderÁ Ý ÝÝÝÝÝÝ„ ä½ ä” äï ä
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decode_eofÁ ä framedÁ é™ ÇÇ encoderÁ ì ìì� ï½ ï” ïÎ ÇÇ framed_implÁ ô ôôôôôôôôô ô
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ô ô ô
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ôôôôô INITIAL_CAPACITYÁ ô
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WriteFrameÁ ˆ bufferÁ ˆ backpressure_boundaryÁ ô ‹> ô�> ô�ï ô‘ï ô“ borrowÁ ô•
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borrow_mutÁ ô—‰6 ô™œ6 ô›™ ›�& ›¢( ›½ ›Å ô ¥™ ¥ IÁ ¥�& ¥ WÁ ¥” ¥û ¥Ÿ ¥� ¥± ÇÇÇÇÇÇ·3 µ µµµµµµµµµ µ
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µ µ µ
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µµµµµµµ Ê™ Ê�& Ê• Ê
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with_capacityÁ Ê
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from_partsÁ Ê£ Ê get_mutÁ Ê get_pin_mutÁ ʼ1 Ê codec_mutÁ Ê map_codecÁ Õk ÕÙ Ê
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codec_pin_mutÁ Ê read_bufferÁ Ê read_buffer_mutÁ Ê write_bufferÁ Ê write_buffer_mutÁ ʵ5 Ê set_backpressure_boundaryÁ Êö Ê
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into_partsÁ µá™ á�& á½ áÅ µæ™ æ–7 æ�& æ” æû æŸ æ� æ± µï™ ï�& ïÍ µó™ ó�& ó• ö–7 ÇÇ Ç
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Ç framed_readÁ û ûûûûûûûûû û
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û û û
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ûû ‹™ ‹ DÁ ‹• ‹ÿ8 ‹£ ‹®9 ‹½9 ‹ö ‹Ø2 ‹ decoder_mutÁ ‹ map_decoderÁ –k –Ù ‹ decoder_pin_mutÁ ‹ž: ‹±: ‹¥; û�™ �Ý= �½ �Å û¢™ ¢–7 ¢Ý= ¢” ¢û ¢Ÿ ¢� ¢± û«™ «Ý= «Í Ç Ç framed_writeÁ ° °°°°°°°°° °
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° ° °
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°°° Á™ Á EÁ Á• Áÿ8 Á£ Á®9 Á½9 Áö ÁÒ3 Á encoder_mutÁ Á map_encoderÁ Ìk ÌÙ Á encoder_pin_mutÁ ÁÈ: ÁÜ: Áµ5 Áü: Á¥; °Õ™ Õ–7 Õÿ@ Õ” Õû ÕŸ Õ� Õ± °Þ™ ÞÝ= Þ½ ÞÅ °ã™ ã�& ãÍ Ç Ç length_delimitedÁ è èèèèèèèèè è
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è è è
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èèèèèèèèè LengthDelimitedCodecErrorÁ ÿ _privÁ è �• � builderÁ � max_frame_lengthÁ � set_max_frame_lengthÁ � decode_headÁ � decode_dataÁ 舽 ˆ” ˆï 茔 ŒÎ Ž è�> è�E ’ LengthFieldTypeÁ ’ ’’’’處 ™
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big_endianÁ ™
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little_endianÁ ™
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native_endianÁ ™�E ™ length_field_typeÁ Ÿ™ ™ length_field_lengthÁ ™ length_field_offsetÁ ™ length_adjustmentÁ ™ num_skipÁ ™ new_codecÁ ™ new_readÁ ¦™ ™ new_writeÁ ¨™ ™
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new_framedÁ ª™ ™ num_head_bytesÁ ™ get_num_skipÁ ™ adjust_max_frame_lenÁ è¯> è±Í è³Í èÇ
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ÇÇÇ lines_codecÁ ¹ ¹¹¹¹¹¹¹¹¹ ¹
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¹ Å• Å new_with_max_lengthÁ Å
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max_lengthÁ ¹ utf8Á É ¹ without_carriage_returnÁ ¹Ì½ Ì” Ìï Ï Ì¥3 ¹Ò™ Ò” ÒÎ ¹Ö> ¹ØÍ ¹Úï ¹ÇÇÇÇ any_delimiter_codecÁ à ààààààààà à
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à à DEFAULT_SEEK_DELIMITERSÁ à DEFAULT_SEQUENCE_WRITERÁ à ï• ïéJ ï„K àó½ ó” óï ö ó¥3 àù™ ù” ùÎ àý> àÿÍ à�ï àÇÇÇÈ
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BytesCodecÁ ‡
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‡ì ÈÈÈŒÈ ÈŽÍ È�˜ È È
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“Õ È •Ð È —¤ È
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™¢ šµ Èœ> ô ReadFrameÁ ž eofÁ ž is_readableÁ ž§5 ž has_erroredÁ ô
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£Í ô RWFramesÁ ¥ readÁ ¥ writeÁ ô ¨> µ FramedPartsÁ ª™ ª�& ª ioÁ ª¼1 ª read_bufÁ ª write_bufÁ ªçD µ²™ ²�& ²Í è BuilderÁ ¶
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max_frame_lenÁ ¶ length_field_lenÁ ¶òG ¶�H ¶¦H ¶ length_field_is_big_endianÁ è ½Í è
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è ÀÈ è è LengthDelimitedCodecÁ Ã�E Ã� è
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ÆÍ èÈÈ è DecodeStateÁ Ê HeadÁ Ë
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Ê DataÁ Í
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Íì èÐÍ èèÓÈ è¹
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LinesCodecÁ Ö
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next_indexÁ Ö„K Ö
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is_discardingÁ ¹ÚÈ ¹ÜÍ ¹ Þ˜ ¹
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¹ áÕ ¹ ãÐ ¹
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å¤ ¹ç¢ èµ ¹ LinesCodecErrorÁ ê MaxLineLengthExceededÁ ë
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ê IoÁ í
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íì ¹ðÍ à AnyDelimiterCodecÁ òñT ò„K ò‹U ò seek_delimitersÁ ò sequence_writerÁ àøÈ àúÍ à ü˜ à
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à ÿÕ à �Ð à
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ƒ¤ à…¢ †µ à AnyDelimiterCodecErrorÁ ˆ MaxChunkLengthExceededÁ ‰
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ˆÁV ‹
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‹ì àŽÍ ÆQ �
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copy_to_bytesÁ ‘ ‘‘‘‘‘‘‘‘ š SÁ š• š£ š®9 šö ‘ « ØY ” û Ÿ � ± ‘¨ØY ¨½ ¨Å � inspectÁ ¬ ¬¬¬¬¬¬¬¬¬ ¬
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¬ ¬ ¬ º¢( ºÙ º• ºö ¬¿¢( ¿Ù ¿Ø( ¬Ã¢( ÃÙ Ãó) Ã� Ã�* â* ý* ¬Ë§7 ËÙ Ë• Ëö ¬Ð§7 ÐÙ Ðó) Ð� Ð�* Т* н* ¬Ø§7 ØÙ ØØ( �ØQ Ü ÜÜÜÜÜÜÜÜØQ å¢( åù- å å é ReadBufFnÁ ê
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ê« ê¢( êù- êì êí é ñ« ñ¢( ñù- ñØ ñÄ �
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reader_streamÁ ÷ ÷÷÷÷÷÷÷÷÷ ÷ DEFAULT_CAPACITYÁ ÷ ƒ ¢( ƒ • ƒ ÿ8 ÷‡ ¢( ‡ ½ ‡ Å Š � simplexÁ Œ Œ Œ Œ Œ Œ Œ Œ Œ Œ Œ
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Œ Œ Œ
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Œ Œ Œ Œ Œ Œ IoResultÁ ™ Œ CLOSED_ERROR_MSGÁ Œ £ ÿ8 £ register_receiver_wakerÁ £ register_sender_wakerÁ £ take_receiver_wakerÁ £ take_sender_wakerÁ £ ’ £ close_receiverÁ £ close_senderÁ Œ ¬ ² Œ ® Ø( Œ ° ² Œ ² ó) ² � ² �* ² ½* ² ¢* Œ • � sink_writerÁ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹ ¹
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¹ ¹ Æ ØY Æ • Æ £ Æ ®9 Æ ö ¹ Ì ØY Ì ÿ@ Ì « Ì ó) Ì � Ì �* ¹ Ó ØY Ó ½ Ó Å ¹ × ØY × Ø( �
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stream_readerÁ Ú Ú Ú Ú Ú Ú Ú Ú Ú Ú Ú
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Ú Ú ç ØY ç ù- ç ÿ@ ç • ç has_chunkÁ ç into_inner_with_chunkÁ Ú î ØY î ù- î £ î ®9 î ½9 î ö Ú õ ØY õ ù- õ ÿ@ õ Ø( Ú ú ØY ú ù- ú ÿ@ ú þ( ú “) Ú €
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ØY €
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ù- Ú StreamReaderProjectÁ ƒ
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« ƒ
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ØY ƒ
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ù- ƒ
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õ ƒ
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chunkÁ Ú ‰
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ØY ‰
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ù- ‰
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projectÁ Ú �
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ØY �
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ù- �
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ÿ@ �
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™ �
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” �
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û �
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Ÿ �
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� �
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Œ § ¢
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µ5 ¢
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’ ¢
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receiver_wakerÁ ¢
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sender_wakerÁ ¢
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bufÁ Œ ¨
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Í Œ ÷ ª
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õ Œ ¬
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Í Œ SenderÁ ®
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õ Œ °
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Í Ú StreamReaderÁ ²
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ØY ²
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ù- ²
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õ ²
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‹h Ú ·
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ØY ·
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ù- ·
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Í DropGuardÁ »
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õ ½
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Í DropGuardRefÁ ¿
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« ¿
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õ Â
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« Â
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Í WaitForCancellationFutureÁ Å
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« Å
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Î Å
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„ É
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Ê
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« É
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__assert_not_repr_packedÁ Ì
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« É
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ProjectionÁ Î
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'__pinÁ Î
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« Î
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Î Î
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„ É
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ProjectionRefÁ Ó
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‹m Ó
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« Ó
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Î Ó
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h Ø
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‹m Ê
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project_refÁ Ú
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‹m É
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__OriginÁ Ü
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‹m Ü
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« Ü
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__dummy_lifetimeÁ Ü
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Î Ü
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„ É
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â
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Ë ü÷'G
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E Cancel the [`CancellationToken`] and all child tokens which had beenÁ ¤Ï2
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|
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F Be aware that cancellation is not an atomic operation. It is possibleÁ üŽ4K
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H for another thread running in parallel with a call to `cancel` to firstÁ üÞ4J
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|||
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G receive `true` from `is_cancelled` on one child node, and then receiveÁ ü5H
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8 Returns `true` if the `CancellationToken` is cancelled.ÁdØ7
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I Returns a [`Future`] that gets fulfilled when cancellation is requested.Á ÿ8
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Equivalent to:Á ž9
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```ignoreÁ ô¸9
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async fn cancelled(&self);Á <Û9
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Ë üï9J
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G The future will complete immediately if the token is already cancelledÁ ü¾:
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|||
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|
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|
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# Cancellation safetyÁ ˆ;
|
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This method is cancel safe.ÁL»;
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ˆ» üƒ>#
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async fn cancelled_owned(self);Á <«>
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Ë ü¿>J
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D The function takes self by value and returns a future that owns theÁ T†@
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token.Á •@
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( Creates a [`DropGuard`] for this token.Á •B
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Ë ü�BH
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E Returned guard will cancel this token (and all its children) on dropÁ ¤êB
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unless disarmed.ÁTŠC
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üçET
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Q Runs a future to completion and returns its result wrapped inside of an `Option`Á üÀFT
|
|||
|
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Q unless the [`CancellationToken`] is cancelled. In that case the function returnsÁ ü™G'
|
|||
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$ `None` and the future gets dropped.Á ÅG
|
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Ë tÍG
|
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# FairnessÁ àG
|
|||
|
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Ë üèGG
|
|||
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D Calling this on an already-cancelled token directly returns `None`.Á ü´HB
|
|||
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? For all subsequent polls, in case of concurrent completion andÁ üûH?
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< cancellation, this is biased towards the future completion.Á ¿I
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Ë ÌÇI
|
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Ë üíI<
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±Õ´$ý ¬x4ƒ Ü€ ™ ³ ³ ›ê … õö$ˆ ÓÜ´µ¶·¸¹º» (* üÆ % ü¢ Creates a new `PollSender`.Á Í Ñ¶ÓÜ ² ²
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µÕ´$¥ ü‡&Z üù 6 3 Attempts to prepare the sender to receive a value.Á ´! Ë ü¼!U R This method must be called and return `Poll::Ready(Ok(()))` prior to each call toÁ „–"
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`send_item`.Á «" Ë ü³"^ [ This method returns `Poll::Ready` once the underlying channel is ready to receive a value,Á ü–#V S by reserving a slot in the channel for the item to be sent. If this method returnsÁ üñ#G D `Poll::Pending`, the current task is registered to be notified (viaÁ ü½$K H `cx.waker().wake_by_ref()`) when `poll_reserve` should be called again.Á �% Ë d•% # ErrorsÁ ¦% Ë ü®%T Q If the channel is closed, an error will be returned. This is a permanent state.ÁdŽ& Ÿ ¡ ŸÓÜ £~£~ | ¥~��~ ¦~³þ�~ §~Êþ�~ ¨~Ùþ�~ ©~ìþ�~ àOÜD}�@ ¡ÈÌÊÌ ËÌö ÌÌì ÍÌÎÌß ¢õ ¯¹ü£ê³í³ î³Ò ï³ì ð³ ñ³“ò³ì äs{ ©¶‘ ‰Û ² ›& ²
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¶Õ´$ & ÷Õ¦& üç5E üŽ2! Sends an item to the channel.Á ´2 Ë ü¼2V S Before calling `send_item`, `poll_reserve` must be called with a successful returnÁ ü—3# value of `Poll::Ready(Ok(()))`.Á ¿3 Ë dÇ3 �€ Ø3 Ë üà3T ¯€ ¹4 Ë dÁ4 # PanicsÁ Ò4 Ë üÚ4` ] If `poll_reserve` was not successfully called prior to calling `send_item`, then this methodÁ |¿5 will panic.Á R|Ó5 Lî
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< 9 - `Poll::Ready(Some(permit))` if a permit was acquired.Á üÙ
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< 9 - `Poll::Ready(None)` if the semaphore has been closed.Á š Ë ü¢ K H When this method returns `Poll::Pending`, the current task is scheduledÁ üò D A to receive a wakeup when a permit becomes available, or when theÁ ü» L I semaphore is closed. Note that on multiple calls to `poll_acquire`, onlyÁ üŒ
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D A the `Waker` from the `Context` passed to the most recent call isÁ üÕ
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" scheduled to receive a wakeup.Ádƒ ´ µ ¶ ´÷Ý µ£~£~ | ¥~��~ ¦~³þ�~ §~Êþ�~ ¨~Ùþ�~ ©~ìþ�~ àOÜD}�@ ¶ÈÌÊÌ ËÌö ÌÌì ÍÌÎÌß ¢õ ¯¹ü£ø°ú°û°Ð ü° ý°�þ°ì H�ˈXêE>þª Û � Û
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à $•÷Õ›üªŒ üŠ4 1 Poll to acquire many permits from the semaphore.Á ÃË üË)Á¯ ùË ü�>þ¯ üÄ<Å° ü…<Š± ÆË üÎKÚ± üžF C to receive a wakeup when the permits become available, or when theÁ üéLû² üºDг üƒ"�´Œ± · ¸ ¹ ·÷Ý ¸£~£~ | ¥~��~ ¦~³þ�~ §~Êþ�~ ¨~Ùþ�~ ©~ìþ�~ àOÜD}�@ ¹å¶ Û Ì Û
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á $Ñ÷Õß¡ª<ýüÑ$( ü¼"4 1 Returns the current number of available permits.Á õ"Ë üý"L I This is equivalent to the [`Semaphore::available_permits`] method on theÁ üÎ#" `tokio::sync::Semaphore` type.Á õ#Ë üý#O L [`Semaphore::available_permits`]: tokio::sync::Semaphore::available_permitsÁŒØ$ º º÷Ý Û ê$ Û
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â $ë$ü·(# ü²%* ' Adds `n` new permits to the semaphore.Á á%Ë üé%R O The maximum number of permits is [`Semaphore::MAX_PERMITS`], and this functionÁ üÀ&( % will panic if the limit is exceeded.Á í&Ë üõ&F C This is equivalent to the [`Semaphore::add_permits`] method on theÁ üÀ'"À¼ ç'Ë üï'C @ [`Semaphore::add_permits`]: tokio::sync::Semaphore::add_permitsÁ\¾( » »÷Ý Û Ê( Û
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ã $Ë( nÁ Ñ(ì�) ÷Ýåæ $F $G æ L±)$¶) ä ä þªüØ)^LÛ) ¼ ½ ¾˜²˜² É€ š²Ã ëU $ . ê‹*èE ¼÷Ý ½£~£~ | ¥~��~ ¦~³þ�~ §~Êþ�~ ¨~Ùþ�~ ©~ìþ�~ àOÜD}�@ ¾å¶ ä ï) ä
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æ $å)÷Õû)äñ* ÷Ýè ß è ü”+ ,—+ ¿ ¿÷Ý ÷Ý ç �+ ç
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è $ž+üï+! ÷Ýê á` ê ü—,8 š, À Á  À÷Ý ÁÁ`Á` œ Ã`è Á] Ä`‚jÁ] Ê\É:• €§ é ž, é
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ê $Ÿ,þ ¥,üÊ-' ÷Ýì ó ì ôø-4û- à Ã÷Ý ÃÑÞ ë ‚. ë
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ì $ƒ.쉚f„© dü˜žÅ4 ”Í î ïÍ ! ï+ î ð„$8 »| î ò¤4> ®Ì î óóç$V Õ î õ ManuallyDropÁd\ íÑ î öÉ€ y ˜² î ÷÷ ‡ ê î ø|<œ £~ î úã$¥ ÈÌ î û”ÝD ÍÜ*¾4/¯±ôK P…‡lovD‚gÔ�Y[HJüï# ü> ; A reusable `Pin<Box<dyn Future<Output = T> + Send + 'a>>`.Á ìË üðC @ This type lets you replace the future stored in the box withoutÁ ü´: 7 reallocating when the size and alignment permits this.Á Œú « ý ™ þ ý þ æò � ü ü ÿ# ÿ¨$ î žV¶m>îoµ «²µ žV¶m>îoµ ÿŒVX ü™3,™î ü ü ˜²˜² É€ š²Ã ëU $ . ê‹*èE•• – BoxÁ ™ìƒ šíƒ l Õ°Ù[¢'õ ®Ì ¯Ì ²µ ¨â «‚‹üÑ$ « � ™ ‚ � ‚ æò ÚÃ̓…‡�Ž Ö üÈU üüG D Create a new `ReusableBoxFuture<T>` containing the provided future.Á Ï ¨ËÃÍ €Ù „ „ € ©â¨Ë Ó ®Ì¨Ë ”þ ¨Ë¯Ì ²µT… ¨â¨Ë $“
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m üŒ 4ÐÑ Å Ë üÍ I F This function never reallocates, but returns an error if the providedÁ ü›
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F C future has a different size or alignment from the currently storedÁ \æ
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future.Á<ý
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‰ «�Ì thisÁ$±„4ê�UW Š<Œ ‰à” Œ ø” Œ •• Œ Œ ‰ Œ �Ì •• –ûÍ ™ìƒ šíƒ l Õ°Ù[¢'õ�Ì‚‹ ˜²˜² É€ š²Ã ëU $ . ê‹*èE•• –ûÍ ™ìƒ šíƒ l Õ°Ù[¢'õ ®Ì ¯Ì ùß ¨â‚‹ü¥F üì4 1 Get a pinned reference to the underlying future.Á<¬ Ç ÇÃ͘²˜² É€ š²Ã ëU $ . ê‹*èE Ç ®Ì ¯Ì ²µ ¨â Ç € ´ €
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� «²µ$¹üÅ7 ü•+ ( Poll the future stored inside this box.Á$Ì È É Ê ÈÃÍ É£~£~ | ¥~��~ ¦~³þ�~ §~Êþ�~ ¨~Ùþ�~ ©~ìþ�~ àOÜD}�@ ÊÈÌÊÌ ËÌö ÌÌì ÍÌÎÌß ¢õ ¯¹ü£²µ € Ñ €
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# ExampleÁ ¬Ë <°ñ£ ü¸! use bytes::{Bytes, BytesMut};Á üÚ use tokio_stream as stream;Á Ôú use tokio::io::Result;Á ü•6 3 use tokio_util::io::{StreamReader, poll_read_buf};Á ìÌ use std::future::poll_fn;Á ´ê use std::pin::Pin;Á ü�/ , # #[tokio::main(flavor = "current_thread")]Á ü±. + # async fn main() -> std::io::Result<()> {Á àË üäN K // Create a reader from an iterator. This particular reader will always beÁ l³
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// ready.Á üÁh e let mut read = StreamReader::new(stream::iter(vec![Result::Ok(Bytes::from_static(&[0, 1, 2, 3]))]));Á ªË ü®" let mut buf = BytesMut::new();Á ´Ñ let mut reads = 0;Á èË Tì loop {Á œ÷ reads += 1;Á ü‹V S let n = poll_fn(|cx| poll_read_buf(Pin::new(&mut read), cx, &mut buf)).await?;Á âË œæ if n == 0 {Á ”ú break;Á L� }Á ,—ä£ �Ë ü¡, ) // one or more reads might be necessary.Á ÄÎ assert!(reads >= 1);Á üç( % assert_eq!(&buf[..], &[0, 1, 2, 3]);Á d� # Ok(())Á <� # }Á <¥ ñ£lí † ‡ ˆ ‰˜²˜² É€ š²Ã ëU $ . ê‹*èE †Õ´ ‡£~£~ | ¥~��~ ¦~³þ�~ §~Êþ�~ ¨~Ùþ�~ ©~ìþ�~ àOÜD}�@ ˆ ‰ÖÓð€ ™ � ù- ‘ ‘ � ª
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o % q % x lù»KNKJ 8¶ I H 7¼1 G F ü 9 6 Adaptors from `AsyncRead`/`AsyncWrite` to Stream/SinkÁ :Ë ü>K H Raw I/O objects work with byte sequences, but higher-level code usuallyÁ üŠA > wants to batch these into meaningful chunks, called "frames".Á ÌË üÐP M This module contains adapters to go from streams of bytes, [`AsyncRead`] andÁ ü¡K H [`AsyncWrite`], to framed streams implementing [`Sink`] and [`Stream`].Á üí0 - Framed streams are also known as transports.Á žË ü¢) & # Example encoding using `LinesCodec`Á ÌË üÐS P The following example demonstrates how to use a codec such as [`LinesCodec`] toÁ ü¤P M write framed data. [`FramedWrite`] can be used to achieve this. Data sent toÁ üõT Q [`FramedWrite`] are first framed according to a specific codec, and then sent toÁ üÊ% " an implementor of [`AsyncWrite`].Á ðË <ôñ£ üü use futures::sink::SinkExt;Á üœ& # use tokio_util::codec::LinesCodec;Á üÃ' $ use tokio_util::codec::FramedWrite;Á ëË üï/¡À ¼Ÿ # async fn main() {Á ä· let buffer = Vec::new();Á üÔ* ' let messages = vec!["Hello", "World"];Á üÿ$ ! let encoder = LinesCodec::new();Á ¤Ë ü¨D A // FramedWrite is a sink which means you can send values into itÁ ´í // asynchronously.Á ü„ 7 4 let mut writer = FramedWrite::new(buffer, encoder);Á ¼ Ë üÀ J G // To be able to send values into a FramedWrite, you need to bring theÁ ü‹
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b _ will keep reading from an [`AsyncRead`] implementor until a whole frame, according to a codec,Á ”Ä can be parsed.Á ×Ë 4ÛÓ‹ üâ use tokio_stream::StreamExt;Á üƒ&ü„ üª& # use tokio_util::codec::FramedRead;Á ÑË üÕ/¡À ¼…ò… ü�, ) let message = "Hello\nWorld".as_bytes();Á üÊ$ ! let decoder = LinesCodec::new();Á ïË üóU R // FramedRead can be used to read a stream of values that are framed according toÁ üÉW T // a codec. FramedRead will read from its input (here `buffer`) until a whole frameÁ ¬¡ // can be parsed.Á ü·7 4 let mut reader = FramedRead::new(message, decoder);Á ïË üó> ; // To read values from a FramedRead, you need to bring theÁ ü²$ ! // `StreamExt` trait into scope.Á ü×7 4 let frame1 = reader.next().await.unwrap().unwrap();Á ü�7 4 let frame2 = reader.next().await.unwrap().unwrap();Á ÇË üË+ ( assert!(reader.next().await.is_none());Á ü÷ assert_eq!(frame1, "Hello");Á ü˜ assert_eq!(frame2, "World");Á <¹äÆ <Áñ£ ÉË ¼Í # The Decoder traitÁ åË üéO L A [`Decoder`] is used together with [`FramedRead`] or [`Framed`] to turn anÁ ü¹O L [`AsyncRead`] into a [`Stream`]. The job of the decoder trait is to specifyÁ ü‰G D how sequences of bytes are turned into a sequence of frames, and toÁ üÑF C determine where the boundaries between frames are. The job of theÁ ü˜N K `FramedRead` is to repeatedly switch between reading more data from the IOÁ üçL I resource, and asking the decoder whether we have received enough data toÁ ü´! decode another frame of data.Á ÖË üÚP M The main method on the `Decoder` trait is the [`decode`] method. This methodÁ ü«P M takes as argument the data that has been read so far, and when it is called,Á üü2 / it will be in one of the following situations:Á ¯Ë ü³3 0 1. The buffer contains less than a full frame.Á üç1 . 2. The buffer contains exactly a full frame.Á ü™ 3 0 3. The buffer contains more than a full frame.Á Í Ë üÑ A > In the first situation, the decoder should return `Ok(None)`.Á “ Ë ü— M J In the second situation, the decoder should clear the provided buffer andÁ üå ) & return `Ok(Some(the_decoded_frame))`.Á � Ë ü“ P M In the third situation, the decoder should use a method such as [`split_to`]Á üä O L or [`advance`] to modify the buffer such that the frame is removed from theÁ ü´ N K buffer, but any data in the buffer after that frame should still remain inÁ üƒ O L the buffer. The decoder should also return `Ok(Some(the_decoded_frame))` inÁ tÓ this case.Á â Ë üæ O L Finally the decoder may return an error if the data is invalid in some way.Á ü¶!O L The decoder should _not_ return an error just because it has yet to receiveÁ Œ†" a full frame.Á ˜"Ë üœ"M J It is guaranteed that, from one call to `decode` to another, the providedÁ üê"O L buffer will contain the exact same data as before, except that if more dataÁ üº#M J has arrived through the IO resource, that data will have been appended toÁ üˆ$F C the buffer. This means that reading frames from a `FramedRead` isÁ üÏ$1 . essentially equivalent to the following loop:Á �%Ë l…%Õ› ü“% use tokio::io::AsyncReadExt;Á ü´%C @ # // This uses async_stream to create an example that compiles.Á üø%r o # fn foo() -> impl futures_core::Stream<Item = std::io::Result<bytes::BytesMut>> { async_stream::try_stream! {Á üë&% " # use tokio_util::codec::Decoder;Á ü‘'= : # let
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üg# Decoding of frames via buffers.Á ‹Ë ü�E B This trait is used when constructing an instance of [`Framed`] orÁ üÕO L [`FramedRead`]. An implementation of `Decoder` takes a byte stream that hasÁ ü¥H E already been buffered in `src` and decodes the data into a stream ofÁ Äî `Self::Item` frames.Á ‡Ë ü‹D A Implementations are able to track state on `self`, which enablesÁ üÐM J implementing stateful streaming parsers. In many cases, though, this typeÁ üž= : will simply be a unit struct (e.g. `struct HttpDecoder`).Á ÜË üà= : For some underlying data-sources, namely files and FIFOs,Á üž> ; it's possible to temporarily read 0 bytes by reaching EOF.Á ÝË üá? < In these cases `decode_eof` will be called until it signalsÁ ü¡> ; fulfillment of all closing frames by returning `Ok(None)`.Á üàO L After that, repeated attempts to read from the [`Framed`] or [`FramedRead`]Á ü°J G will not invoke `decode` or `decode_eof` again, until data can be readÁ œû during a retry.Á �Ë ü“D A It is up to the Decoder to keep track of a restart after an EOF,Á üØ> ; and to decide how to handle such an event by, for example,Á ü— K H allowing frames to cross EOF boundaries, re-emitting opening frames, orÁ üã ( % resetting the entire internal state.Á Œ
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L I `From<io::Error>` is required in the interest of making `Error` suitableÁ ü�K H for returning directly from a [`FramedRead`], and to enable the defaultÁ üàK H implementation of `decode_eof` to yield an `io::Error` when the decoderÁ ü°( % fails to consume all available data.Á ÝË üåJ G Note that implementors of this trait can simply indicate `type Error =Á ü´. + io::Error` to use I/O errors as this type.Á çË üï,Õ„,¥ ä ä üŸ(T üÂA > Attempts to decode a frame from the provided buffer of bytes.Á ˆË ü�J G This method is called by [`FramedRead`] whenever bytes are ready to beÁ üßH E parsed. The provided buffer of bytes is what's been read so far, andÁ ü¬I F this instance of `Decode` can determine whether an entire frame is inÁ üú+ ( the buffer and is ready to be returned.Á ªË ü²I F If an entire frame is available, then this instance will remove thoseÁ ü€? < bytes from the buffer provided and return them as a decodedÁ üÄK H frame. Note that removing bytes from the provided buffer doesn't alwaysÁ ü”K H necessarily copy the bytes, so this should be an efficient operation inÁ ¼ä most circumstances.Á €Ë üˆH E If the bytes look valid, but a frame isn't fully available yet, thenÁ üÕJ G `Ok(None)` is returned. This indicates to the [`Framed`] instance thatÁ ü¤F C it needs to read some more bytes before calling this method again.Á ïË ü÷D A Note that the bytes provided may be empty. If a previous call toÁ üÀG D `decode` consumed all the bytes in the buffer then `decode` will beÁ üŒP M called again until it returns `Ok(None)`, indicating that more bytes need toÁ dá be read.Á òË üúF C Finally, if the bytes in the buffer are malformed then an error isÁ üÅK H returned indicating why. This informs [`Framed`] that the stream is nowÁ ü• % " corrupt and should be terminated.Á ¿ Ë üÇ $¨„ üð ,Õ„ ¡ Ë ¼© # Buffer managementÁ Å Ë üÍ J G Before returning from the function, implementations should ensure thatÁ üœ J G the buffer has appropriate capacity in anticipation of future calls toÁ üë 5 2 `decode`. Failing to do so leads to inefficiency.Á ¥ Ë ü G D For example, if frames have a fixed length, or if the length of theÁ üù F C current frame is known from a header, a possible buffer managementÁ „Ä
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P ó° üŠQ N I/O object, using [`Decoder`] and [`Encoder`] to read and write the raw data.Á à Ë üèK ¦þ ü¸F ¹² üƒE B method layers framing on top of an I/O object, by using the codecÁ üÍH س üš: ©´ Ù Ë üáG D This function returns a *single* object that is both [`Stream`] andÁ üM J [`Sink`]; grouping this into a single object is often useful for layeringÁ üÿL ™¶ ´Ð í¶ ë Ë üóI —· üÁI F calling [`split`] on the `Framed` returned by this method, which willÁ ü�L »¸ à Ë üèL I Note that, for some byte sources, the stream can be resumed after an EOFÁ ü¹L I by reading from it, even after it has returned `None`. Repeated attemptsÁ üŠK H to do so, without new data available, continue to return `None` withoutÁ üÚ# creating more (closing) frames.Á ‚ Ë üŠ$ åç ü³ ’è üØ% " [`Decode`]: crate::codec::DecoderÁ ü‚& # [`Encoder`]: crate::codec::EncoderÁ ü[ X [`split`]: https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html#method.splitÁ ” Õ´Û´“º Ê Ê
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ÍÕ´Û´õ,˜ ¼1,¢ üØ&I üìP ó° üÁ Q N I/O object, using [`Decoder`] and [`Encoder`] to read and write the raw data,Á ü— 1 . with a specific read buffer initial capacity.Á Í Ë üÕ K ¦þ ü¥ F ¹² üð E ¹ê üº H س ü‡ : ©´ Æ Ë üÎ G ¬ë üš!M üë üì!L ™¶ ´½" í¶ Ø" Ë üà"I —· ü®#I ƒí üü#L »¸ Í$ Ë üÕ$$ åç üþ$ ’è ü£%% ¼ð üÍ%& êð üø%[ ™ñlß& Õ´Û´ “º Ê Ê
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ÎÕ´Û´õ,í& ¼1,÷& µ‚D�' ü¹8; ü“,P ó° üè,Q ºé ¾- Ë üÆ-K ¦þ ü–.F ¹² üá.G ˆ³ ü/H س üú/: ©´ ¹0 Ë üÁ0G ¬ë ü�1M üë üß1L ™¶ ´°2 í¶ Ë2 Ë üÓ2S P This objects takes a stream and a `readbuffer` and a `writebuffer`. These fieldÁ ü«3M J can be obtained from an existing `Framed` with the [`into_parts`] method.Á ý3 Ë ü…4I —· üÓ4I ƒí ü¡5L »¸ ò5 Ë üú5$ åç ü£6 ’è üÈ6& # [`Decoder`]: crate::codec::DecoderÁ üó6& êð üž76 3 [`into_parts`]: crate::codec::Framed::into_parts()Á üÙ7[ ™ñTÀ8 ¥»“º Ê Ê
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ÏÕ´Û´ partsÁ,Ë8 ܾ= üª;? < Returns a reference to the underlying I/O stream wrapped byÁ lî;
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`Framed`.Á €< Ë üˆ<K H Note that care should be taken to not tamper with the underlying streamÁ üØ<F C of data coming in as it may corrupt the stream of frames otherwiseÁ ´£= being worked with.Á<Å= ² ²“º ²Õ´ Ê Í= Ê
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ÐÕ´Û´$Î= ü�@# ü�>G D Returns a mutable reference to the underlying I/O stream wrapped byÁ lÍ> ¶ü ß> Ë üç>K ×ü ü·?F «ý ´‚@ ùý<¤@ ³ ³“º ³Õ´ Ê ¬@ Ê
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ÑÕ´Û´$±@ ü�C7 üì@N K Returns a pinned mutable reference to the underlying I/O stream wrapped byÁ l¿A ¶ü ÑA Ë üÙAK ×ü ü©BF «ý ´ôB ùý\–C ´˜²˜² É€ š²Ã ëU $ . ê‹*èE ´“º˜²˜² É€ š²Ã ëU $ . ê‹*èE ´Õ´ Ê ¬C Ê
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ÒÕ´Û´$¢C ÌõE ü�D: 7 Returns a reference to the underlying codec wrapped byÁ lÀD ¶ü ÒD Ë üÚDJ G Note that care should be taken to not tamper with the underlying codecÁ ü©EG D as it may corrupt the stream of frames otherwise being worked with.Á,üE µ µ“º µÛ´ Ê ‚F Ê
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ÓÕ´Û´$ƒF ü²H% ü¶FB ? Returns a mutable reference to the underlying codec wrapped byÁ lýF ¶ü �G Ë ü—GJ ¬„ üæGG ÿ„L¹H ¶ ¶“º ¶Û´ Ê ÃH Ê
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ÔÕ´Û´$ÈH üŒKY üƒID A Maps the codec `U` to `C`, preserving the read and write buffersÁ ÄÌI wrapped by `Framed`.Á éI Ë üñIJ ¬„ üÀJG ÿ„L“K “º�ê � � ö‘ „õ µ *O¶X ]Õ´k Êk Ö Ù × Ö × Ê ©âøŠ �K äë K ™ �êÛ´ tÖK �êÏ‹› øŠ ãK
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ÕÕ´Û´øŠ�ê$£K …
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©K ]_ bd üÈP4 üÌNB ·† l“O ¶ü ¥O Ë üOJ ¬„ üüOG ÿ„lÏP ·˜²˜² É€ š²Ã ëU $ . ê‹*èE ·“º ·Û´ Ê çP Ê
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ØÕ´Û´$ÝP üçQ& ü·Q+ ( Returns a reference to the read buffer.Á\îQ ¸ ¸“º ¸®³ Ê úQ Ê
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ÙÕ´Û´$ûQ üùR2 üÁR3 0 Returns a mutable reference to the read buffer.Á|€S ¹ ¹“º ¹®³ Ê �S Ê
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ÚÕ´Û´$•S ü”T' üãS, ) Returns a reference to the write buffer.Ád›T º º“º º®³ Ê ¨T Ê
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ÛÕ´Û´$©T ü©U3 üðT4 1 Returns a mutable reference to the write buffer.Á„°U » »“º »®³ Ê ÁU Ê
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ÜÕ´Û´$ÆU ü»V, ü•V! Returns backpressure boundaryÁ¬ÂV ¼ ¼“º Ê ØV Ê
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ÝÕ´Û´$ÙV üÐW< üªW! Updates backpressure boundaryÁÌ×W ½ ½“º Ê ñW Ê
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ÞÕ´Û´$öW boundaryÁDüW äÝZ üÛX? < Consumes the `Framed`, returning its underlying I/O stream.Á ŸY Ë ü§YK ×ü ü÷YF «ý ´ÂZ ùýTäZ “ºÕ´ Ê Ê
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ßÕ´Û´$ïZ üÛ], ü [J G Consumes the `Framed`, returning its underlying I/O stream, the bufferÁ üï[) & with unprocessed data, and the codec.Á �\ Ë ü¥\K ×ü üõ\F «ý ´À] ùýTâ] “º¥» Ê Ê
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òÕ´Û´$¡i þ §i äðp ™ ô �& õ ô õ ›ê õp Âë øp ¥»ö üÀqT ü“q( % Create a new, default, `FramedParts`Á Çq Õ´Û´¥» ó–7 ÷
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û ƒÄü\Ì û „Í â ï+ û …É€ õ ˜² û †|<Š £~ û ˆã$“ ÈÌ û ‰£Q\¦ ª û Š úü2 ¬< ¤X î¤r ß|� Д¢ Àìº ±DÝ ¢lë ’Ôþ ƒ…rt”Ÿ dÜì ™ Œ Ý= � Œ � ›ê ñ ©â�½ ô ϼŽ��‘’“”•–™š›œ @B <> üË 4 üŽ 8 5 Creates a new `FramedRead` with the given `decoder`.Á Ò Õ´�½Ï¼ ‹ ‹
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ŽÕ´�½õ,Ö Ø2<à üª O ü½ R O Creates a new `FramedRead` with the given `decoder` and a buffer of `capacity`Á Œ” initial size.Ál± Õ´�½ ϼ ‹ ‹
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�Õ´�½õ,¿ Ø2<É µ‚DÕ Ü‰ üñ? ïû Œµ `FramedRead`.Á Ë Ë üÓK ×ü ü£F «ý ´î ùý<� Î Îϼ ÎÕ´ ‹ ˜ ‹
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’Õ´�½$õ äÚ üÔC @ Consumes the `FramedRead`, returning its underlying I/O stream.Á œ Ë ü¤K ×ü üôF «ý ´¿ ùýTá ϼմ ‹ ‹
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“Õ´�½$ì ÜÔ ü�2 / Returns a reference to the underlying decoder.Á<Û Ñ Ñϼ Ñ�½ ‹ ã ‹
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•Õ´�½$î ü† _ ü© ; 8 Maps the decoder `D` to `C`, preserving the read bufferÁ Äé çˆ\� ϼ�ê Ø Ø ±� Ûõ û %¨ÈšÑ´{~Õ´øŠ ‹k — Ù ˜ — ˜ ‹ «‹ ™ äë œ ™ �ê�½ tÖ �ꃿ› øŠ ã
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ÅÕ´à¾õ,– Ò3< µ‚D¬ Ü© ü�? ïû ”Ô `FramedWrite`.Á ë Ë üóK ×ü üÃF «ý ´Ž ùý<° æ 殾 æÕ´ Á ¸ Á
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ÈÕ´à¾$— äý üöD A Consumes the `FramedWrite`, returning its underlying I/O stream.Á ¿ Ë üÇK ×ü ü—F «ý ´â ùýT„ ®¾Õ´ Á Á
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ÉÕ´à¾$� Ü÷ üÀ2 / Returns a reference to the underlying encoder.Á<þ é 鮾 éྠÁ † Á
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7 frame head that specifies the length of the frame. TheÁ ü»H
|
|||
|
|
E `length_delimited` module provides utilities for handling the lengthÁ ü„F
|
|||
|
|
C based framing. This allows the consumer to work with entire framesÁ üËC
|
|||
|
|
@ without having to worry about buffering or other framing logic.Á �
|
|||
|
|
Ë ¬“
|
|||
|
|
# Getting startedÁ ©
|
|||
|
|
Ë üK
|
|||
|
|
H If implementing a protocol from scratch, using length delimited framingÁ üùG
|
|||
|
|
D is an easy way to get started. [`LengthDelimitedCodec::new()`] willÁ üÁG
|
|||
|
|
D return a length delimited codec using default configuration values.Á ü‰F
|
|||
|
|
C This can then be used to construct a framer to adapt a full-duplexÁ üÐ(
|
|||
|
|
% byte stream into a stream of
|
|||
|
|
1
|
|||
|
|
. | len: u32 | frame payload |Á üÐ
|
|||
|
|
1
|
|||
|
|
§Ž <‚
|
|||
|
|
ñ£ Š
|
|||
|
|
Ë üŽ &
|
|||
|
|
# Specifically, given the following:Á µ
|
|||
|
|
Ë <¹
|
|||
|
|
ñ£ üÁ +
|
|||
|
|
͉ üí :
|
|||
|
|
�Š ¨
|
|||
|
|
Ë Ì¬
|
|||
|
|
use futures::SinkExt;Á ¬Æ
|
|||
|
|
use bytes::Bytes;Á Ü
|
|||
|
|
Ë üà L
|
|||
|
|
I async fn write_frame<T>(io: T) -> Result<(), Box<dyn std::error::Error>>Á L
|
|||
|
|
|
|||
|
|
whereÁ ü·
|
|||
|
|
*
|
|||
|
|
' T: AsyncRead + AsyncWrite + Unpin,Á ,â
|
|||
|
|
|
|||
|
|
Á‹ üè
|
|||
|
|
I
|
|||
|
|
F let mut transport = Framed::new(io, LengthDelimitedCodec::new());Á ü²/
|
|||
|
|
, let frame = Bytes::from("hello world");Á â
|
|||
|
|
Ë üæ%
|
|||
|
|
" transport.send(frame).await?;Á tŒ
|
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|
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åÒ ,›
|
|||
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ä£ <¡
|
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|
|
ñ£ ©
|
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|
|
Ë ü*
|
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|
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' The encoded frame will look like this:Á Ø
|
|||
|
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Ë \Ü
|
|||
|
|
“Ž üè'
|
|||
|
|
$ +---- len: u32 ----+---- data ----+Á ü�'
|
|||
|
|
$ | \x00\x00\x00\x0b | hello world |Á ü¸'
|
|||
|
|
$ +------------------+--------------+Á <à
|
|||
|
|
ñ£ è
|
|||
|
|
Ë tì
|
|||
|
|
# DecodingÁ û
|
|||
|
|
Ë üÿK
|
|||
|
|
H [`FramedRead`] adapts an [`AsyncRead`] into a `Stream` of [`BytesMut`],Á üËI
|
|||
|
|
F such that each yielded [`BytesMut`] value contains the contents of anÁ ü•B
|
|||
|
|
? entire frame. There are many configuration parameters enablingÁ üØE
|
|||
|
|
B [`FramedRead`] to handle a wide range of protocols. Here are someÁ üžA
|
|||
|
|
> examples that will cover the various options at a high level.Á à
|
|||
|
|
Ë „ä
|
|||
|
|
|
|||
|
|
## Example 1Á õ
|
|||
|
|
Ë üùK
|
|||
|
|
H The following will parse a `u16` length field at offset 0, omitting theÁ üÅ)
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|
|
& frame head in the yielded `BytesMut`.Á ï
|
|||
|
|
Ë <ó
|
|||
|
|
ñ£ üû"
|
|||
|
|
# use tokio_stream::StreamExt;Á üž2
|
|||
|
|
/ # use tokio_util::codec::LengthDelimitedCodec;Á üÑ/
|
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|
|
¡À ¼�
|
|||
|
|
ò… ü™-
|
|||
|
|
* # let io: &[u8] = b"\x00\x0BHello world";Á üÇ4
|
|||
|
|
1 let mut reader = LengthDelimitedCodec::builder()Á üü0
|
|||
|
|
- .length_field_offset(0) // default valueÁ ü#
|
|||
|
|
.length_field_type::<u16>()Á üÑ0
|
|||
|
|
- .length_adjustment(0) // default valueÁ ´‚
|
|||
|
|
.new_read(io);Á ü™?
|
|||
|
|
< # let res = reader.next().await.unwrap().unwrap().to_vec();Á üÙ&
|
|||
|
|
# # assert_eq!(res, b"Hello world");Á <€
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|
|
äÆ <ˆ
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|||
|
|
ñ£ �
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|||
|
|
Ë ü”0
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|||
|
|
- The following frame will be decoded as such:Á Å
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|
|
Ë \É
|
|||
|
|
“Ž üÕ1
|
|||
|
|
. INPUT DECODEDÁ ü‡6
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|
3 +-- len ---+--- Payload ---+ +--- Payload ---+Á ü¾6
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|||
|
|
3 | \x00\x0B | Hello world | --> | Hello world |Á üõ6
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|
3 +----------+---------------+ +---------------+Á <¬
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|
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ñ£ ´
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Ë ü¸L
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|
|
I The value of the length field is 11 (`\x0B`) which represents the lengthÁ ü… J
|
|||
|
|
G of the payload, `hello world`. By default, [`FramedRead`] assumes thatÁ üÐ H
|
|||
|
|
E the length field represents the number of bytes that **follows** theÁ ü™ L
|
|||
|
|
I length field. Thus, the entire frame has a length of 13: 2 bytes for theÁ üæ *
|
|||
|
|
' frame head + 11 bytes for the payload.Á ‘
|
|||
|
|
Ë „•
|
|||
|
|
|
|||
|
|
## Example 2Á ¦
|
|||
|
|
Ë üª L
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|
|
I The following will parse a `u16` length field at offset 0, including theÁ ü÷ )
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§š ¡
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|
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Ë <¥
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ñ£ ü "
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ðš üÐ 2
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›› üƒ /
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¡À ¼³
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ò… üË -
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ï› üù 4
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¥œ ü®!0
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|
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✠üß!#
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|
|
›� üƒ":
|
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|
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7 .length_adjustment(2) // Add head size to lengthÁ ü¾"7
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|
|
4 .num_skip(0) // Do NOT skip the headÁ ´ö"
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|
|
ÿ� ü�#?
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|||
|
|
žž üÍ#.
|
|||
|
|
+ # assert_eq!(res, b"\x00\x0BHello world");Á <ü#
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|
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äÆ <„$
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|
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ñ£ Œ$
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Ë ü�$0
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¸Ÿ Á$
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Ë \Å$
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|
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“Ž üÑ$4
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|
1 INPUT DECODEDÁ ü†%A
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|
|
> +-- len ---+--- Payload ---+ +-- len ---+--- Payload ---+Á üÈ%A
|
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|
|
> | \x00\x0B | Hello world | --> | \x00\x0B | Hello world |Á üŠ&A
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|
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> +----------+---------------+ +----------+---------------+Á <Ì&
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|
|
ñ£ Ô&
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|
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Ë üØ&I
|
|||
|
|
F This is similar to the first example, the only difference is that theÁ ü¢'J
|
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|
|
G frame head is **included** in the yielded `BytesMut` value. To achieveÁ üí'P
|
|||
|
|
M this, we need to add the header size to the length with `length_adjustment`,Á ü¾(;
|
|||
|
|
8 and set `num_skip` to `0` to prevent skipping the head.Á ú(
|
|||
|
|
Ë „þ(
|
|||
|
|
|
|||
|
|
## Example 3Á �)
|
|||
|
|
Ë ü“)K
|
|||
|
|
Ó™ üß)H
|
|||
|
|
E frame head in the yielded `BytesMut`. I
|
|||
|
|
included.Á •C
|
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|
|
Ë <™C
|
|||
|
|
ñ£ ü¡C"
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|||
|
|
ðš üÄC2
|
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|
|
›› ü÷C/
|
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|
|
¡À ¼§D
|
|||
|
|
ò… ü¿D5
|
|||
|
|
2 # let io: &[u8] = b"\xCA\x00\x0B\xFEHello world";Á üõD4
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|||
|
|
¥œ üªE1
|
|||
|
|
. .length_field_offset(1) // length of hdr1Á üÜE#
|
|||
|
|
›� ü€F0
|
|||
|
|
- .length_adjustment(1) // length of hdr2Á ü±F,
|
|||
|
|
) .num_skip(3) // length of hdr1 + LENÁ ´ÞF
|
|||
|
|
ÿ� üõF?
|
|||
|
|
žž üµG*
|
|||
|
|
' # assert_eq!(res, b"\xFEHello world");Á <àG
|
|||
|
|
äÆ <èG
|
|||
|
|
ñ£ ðG
|
|||
|
|
Ë üôG0
|
|||
|
|
¸Ÿ ¥H
|
|||
|
|
Ë \©H
|
|||
|
|
“Ž ÔµH
|
|||
|
|
ù» üÐH2
|
|||
|
|
/ +- hdr1 -+-- len ---+- hdr2 -+--- Payload ---+Á üƒI2
|
|||
|
|
/ | \xCA | \x00\x0B | \xFE | Hello world |Á ü¶I2
|
|||
|
|
/ +--------+----------+--------+---------------+Á éI
|
|||
|
|
Ë ¤íI
|
|||
|
|
DECODEDÁ ô‚J
|
|||
|
|
+- hdr2 -+--- Payload ---+Á ô¡J
|
|||
|
|
| \xFE | Hello world |Á ôÀJ
|
|||
|
|
+--------+---------------+Á <ßJ
|
|||
|
|
ñ£ çJ
|
|||
|
|
Ë üëJI
|
|||
|
|
F The length field is situated in the middle of the frame head. In thisÁ üµKK
|
|||
|
|
H case, the first byte in the frame head could be a version or some otherÁ ü�LH
|
|||
|
|
E identifier that is not needed for processing. On the other hand, theÁ üÊL&
|
|||
|
|
# second half of the head is needed.Á ñL
|
|||
|
|
Ë üõLJ
|
|||
|
|
G `length_field_offset` indicates how many bytes to skip before startingÁ üÀML
|
|||
|
|
I to read the length field. `length_adjustment` is the number of bytes toÁ ü�NI
|
|||
|
|
F skip starting at the end of the length field. In this case, it is theÁ ä×N
|
|||
|
|
second half of the head.Á ôN
|
|||
|
|
Ë „øN
|
|||
|
|
|
|||
|
|
## Example 6Á ‰O
|
|||
|
|
Ë ü�OI
|
|||
|
|
ç ü×OL
|
|||
|
|
¹Ã ü¤PJ
|
|||
|
|
ŽÄ üïPH
|
|||
|
|
E included. In this case, the length field **includes** the frame headÁ \¸Q
|
|||
|
|
length.Á ÄQ
|
|||
|
|
Ë <ÈQ
|
|||
|
|
ñ£ üÐQ"
|
|||
|
|
ðš üóQ2
|
|||
|
|
›› ü¦R/
|
|||
|
|
¡À ¼ÖR
|
|||
|
|
ò… üîR5
|
|||
|
|
2 # let io: &[u8] = b"\xCA\x00\x0F\xFEHello world";Á ü¤S4
|
|||
|
|
¥œ üÙS1
|
|||
|
|
‹Æ ü‹T#
|
|||
|
|
›� ü¯TA
|
|||
|
|
> .length_adjustment(-3) // length of hdr1 + LEN, negativeÁ ¤ñT
|
|||
|
|
.num_skip(3)Á ´†U
|
|||
|
|
ÿ� ü�U?
|
|||
|
|
žž üÝU*
|
|||
|
|
ÙÇ <ˆV
|
|||
|
|
äÆ <�V
|
|||
|
|
ñ£ ˜V
|
|||
|
|
Ë üœV0
|
|||
|
|
¸Ÿ ÍV
|
|||
|
|
Ë \ÑV
|