forked from mirror/go-ethereum
Guillaume Ballet
6 years ago
parent
21b01f590d
commit
0a0b93708d
@ -0,0 +1,356 @@ |
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Mozilla Public License Version 2.0 |
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================================== |
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|
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### 1. Definitions |
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|
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**1.1. “Contributor”** |
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means each individual or legal entity that creates, contributes to |
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the creation of, or owns Covered Software. |
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|
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**1.2. “Contributor Version”** |
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means the combination of the Contributions of others (if any) used |
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by a Contributor and that particular Contributor's Contribution. |
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|
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**1.3. “Contribution”** |
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means Covered Software of a particular Contributor. |
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|
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**1.4. “Covered Software”** |
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means Source Code Form to which the initial Contributor has attached |
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the notice in Exhibit A, the Executable Form of such Source Code |
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Form, and Modifications of such Source Code Form, in each case |
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including portions thereof. |
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|
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**1.5. “Incompatible With Secondary Licenses”** |
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means |
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|
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* **(a)** that the initial Contributor has attached the notice described |
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in Exhibit B to the Covered Software; or |
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* **(b)** that the Covered Software was made available under the terms of |
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version 1.1 or earlier of the License, but not also under the |
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terms of a Secondary License. |
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|
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**1.6. “Executable Form”** |
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means any form of the work other than Source Code Form. |
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|
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**1.7. “Larger Work”** |
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means a work that combines Covered Software with other material, in |
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a separate file or files, that is not Covered Software. |
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|
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**1.8. “License”** |
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means this document. |
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|
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**1.9. “Licensable”** |
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means having the right to grant, to the maximum extent possible, |
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whether at the time of the initial grant or subsequently, any and |
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all of the rights conveyed by this License. |
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|
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**1.10. “Modifications”** |
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means any of the following: |
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|
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* **(a)** any file in Source Code Form that results from an addition to, |
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deletion from, or modification of the contents of Covered |
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Software; or |
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* **(b)** any new file in Source Code Form that contains any Covered |
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Software. |
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|
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**1.11. “Patent Claims” of a Contributor** |
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means any patent claim(s), including without limitation, method, |
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process, and apparatus claims, in any patent Licensable by such |
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Contributor that would be infringed, but for the grant of the |
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License, by the making, using, selling, offering for sale, having |
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made, import, or transfer of either its Contributions or its |
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Contributor Version. |
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|
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**1.12. “Secondary License”** |
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means either the GNU General Public License, Version 2.0, the GNU |
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Lesser General Public License, Version 2.1, the GNU Affero General |
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Public License, Version 3.0, or any later versions of those |
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licenses. |
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|
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**1.13. “Source Code Form”** |
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means the form of the work preferred for making modifications. |
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|
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**1.14. “You” (or “Your”)** |
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means an individual or a legal entity exercising rights under this |
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License. For legal entities, “You” includes any entity that |
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controls, is controlled by, or is under common control with You. For |
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purposes of this definition, “control” means **(a)** the power, direct |
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or indirect, to cause the direction or management of such entity, |
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whether by contract or otherwise, or **(b)** ownership of more than |
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fifty percent (50%) of the outstanding shares or beneficial |
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ownership of such entity. |
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|
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|
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### 2. License Grants and Conditions |
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|
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#### 2.1. Grants |
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Each Contributor hereby grants You a world-wide, royalty-free, |
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non-exclusive license: |
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|
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* **(a)** under intellectual property rights (other than patent or trademark) |
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Licensable by such Contributor to use, reproduce, make available, |
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modify, display, perform, distribute, and otherwise exploit its |
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Contributions, either on an unmodified basis, with Modifications, or |
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as part of a Larger Work; and |
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* **(b)** under Patent Claims of such Contributor to make, use, sell, offer |
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for sale, have made, import, and otherwise transfer either its |
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Contributions or its Contributor Version. |
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|
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#### 2.2. Effective Date |
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The licenses granted in Section 2.1 with respect to any Contribution |
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become effective for each Contribution on the date the Contributor first |
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distributes such Contribution. |
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#### 2.3. Limitations on Grant Scope |
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The licenses granted in this Section 2 are the only rights granted under |
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this License. No additional rights or licenses will be implied from the |
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distribution or licensing of Covered Software under this License. |
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Notwithstanding Section 2.1(b) above, no patent license is granted by a |
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Contributor: |
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|
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* **(a)** for any code that a Contributor has removed from Covered Software; |
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or |
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* **(b)** for infringements caused by: **(i)** Your and any other third party's |
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modifications of Covered Software, or **(ii)** the combination of its |
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Contributions with other software (except as part of its Contributor |
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Version); or |
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* **(c)** under Patent Claims infringed by Covered Software in the absence of |
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its Contributions. |
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|
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This License does not grant any rights in the trademarks, service marks, |
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or logos of any Contributor (except as may be necessary to comply with |
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the notice requirements in Section 3.4). |
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|
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#### 2.4. Subsequent Licenses |
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No Contributor makes additional grants as a result of Your choice to |
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distribute the Covered Software under a subsequent version of this |
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License (see Section 10.2) or under the terms of a Secondary License (if |
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permitted under the terms of Section 3.3). |
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|
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#### 2.5. Representation |
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Each Contributor represents that the Contributor believes its |
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Contributions are its original creation(s) or it has sufficient rights |
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to grant the rights to its Contributions conveyed by this License. |
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|
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#### 2.6. Fair Use |
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This License is not intended to limit any rights You have under |
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applicable copyright doctrines of fair use, fair dealing, or other |
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equivalents. |
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#### 2.7. Conditions |
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Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted |
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in Section 2.1. |
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### 3. Responsibilities |
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|
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#### 3.1. Distribution of Source Form |
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|
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All distribution of Covered Software in Source Code Form, including any |
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Modifications that You create or to which You contribute, must be under |
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the terms of this License. You must inform recipients that the Source |
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Code Form of the Covered Software is governed by the terms of this |
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License, and how they can obtain a copy of this License. You may not |
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attempt to alter or restrict the recipients' rights in the Source Code |
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Form. |
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|
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#### 3.2. Distribution of Executable Form |
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If You distribute Covered Software in Executable Form then: |
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* **(a)** such Covered Software must also be made available in Source Code |
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Form, as described in Section 3.1, and You must inform recipients of |
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the Executable Form how they can obtain a copy of such Source Code |
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Form by reasonable means in a timely manner, at a charge no more |
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than the cost of distribution to the recipient; and |
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|
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* **(b)** You may distribute such Executable Form under the terms of this |
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License, or sublicense it under different terms, provided that the |
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license for the Executable Form does not attempt to limit or alter |
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the recipients' rights in the Source Code Form under this License. |
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|
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#### 3.3. Distribution of a Larger Work |
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You may create and distribute a Larger Work under terms of Your choice, |
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provided that You also comply with the requirements of this License for |
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the Covered Software. If the Larger Work is a combination of Covered |
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Software with a work governed by one or more Secondary Licenses, and the |
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Covered Software is not Incompatible With Secondary Licenses, this |
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License permits You to additionally distribute such Covered Software |
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under the terms of such Secondary License(s), so that the recipient of |
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the Larger Work may, at their option, further distribute the Covered |
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Software under the terms of either this License or such Secondary |
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License(s). |
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|
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#### 3.4. Notices |
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You may not remove or alter the substance of any license notices |
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(including copyright notices, patent notices, disclaimers of warranty, |
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or limitations of liability) contained within the Source Code Form of |
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the Covered Software, except that You may alter any license notices to |
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the extent required to remedy known factual inaccuracies. |
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|
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#### 3.5. Application of Additional Terms |
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You may choose to offer, and to charge a fee for, warranty, support, |
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indemnity or liability obligations to one or more recipients of Covered |
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Software. However, You may do so only on Your own behalf, and not on |
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behalf of any Contributor. You must make it absolutely clear that any |
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such warranty, support, indemnity, or liability obligation is offered by |
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You alone, and You hereby agree to indemnify every Contributor for any |
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liability incurred by such Contributor as a result of warranty, support, |
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indemnity or liability terms You offer. You may include additional |
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disclaimers of warranty and limitations of liability specific to any |
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jurisdiction. |
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|
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### 4. Inability to Comply Due to Statute or Regulation |
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If it is impossible for You to comply with any of the terms of this |
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License with respect to some or all of the Covered Software due to |
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statute, judicial order, or regulation then You must: **(a)** comply with |
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the terms of this License to the maximum extent possible; and **(b)** |
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describe the limitations and the code they affect. Such description must |
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be placed in a text file included with all distributions of the Covered |
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Software under this License. Except to the extent prohibited by statute |
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or regulation, such description must be sufficiently detailed for a |
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recipient of ordinary skill to be able to understand it. |
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|
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|
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### 5. Termination |
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|
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**5.1.** The rights granted under this License will terminate automatically |
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if You fail to comply with any of its terms. However, if You become |
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compliant, then the rights granted under this License from a particular |
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Contributor are reinstated **(a)** provisionally, unless and until such |
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Contributor explicitly and finally terminates Your grants, and **(b)** on an |
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ongoing basis, if such Contributor fails to notify You of the |
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non-compliance by some reasonable means prior to 60 days after You have |
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come back into compliance. Moreover, Your grants from a particular |
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Contributor are reinstated on an ongoing basis if such Contributor |
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notifies You of the non-compliance by some reasonable means, this is the |
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first time You have received notice of non-compliance with this License |
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from such Contributor, and You become compliant prior to 30 days after |
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Your receipt of the notice. |
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|
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**5.2.** If You initiate litigation against any entity by asserting a patent |
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infringement claim (excluding declaratory judgment actions, |
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counter-claims, and cross-claims) alleging that a Contributor Version |
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directly or indirectly infringes any patent, then the rights granted to |
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You by any and all Contributors for the Covered Software under Section |
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2.1 of this License shall terminate. |
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|
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**5.3.** In the event of termination under Sections 5.1 or 5.2 above, all |
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end user license agreements (excluding distributors and resellers) which |
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have been validly granted by You or Your distributors under this License |
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prior to termination shall survive termination. |
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|
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|
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### 6. Disclaimer of Warranty |
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> Covered Software is provided under this License on an “as is” |
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> basis, without warranty of any kind, either expressed, implied, or |
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> statutory, including, without limitation, warranties that the |
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> Covered Software is free of defects, merchantable, fit for a |
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> particular purpose or non-infringing. The entire risk as to the |
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> quality and performance of the Covered Software is with You. |
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> Should any Covered Software prove defective in any respect, You |
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> (not any Contributor) assume the cost of any necessary servicing, |
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> repair, or correction. This disclaimer of warranty constitutes an |
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> essential part of this License. No use of any Covered Software is |
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> authorized under this License except under this disclaimer. |
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|
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### 7. Limitation of Liability |
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> Under no circumstances and under no legal theory, whether tort |
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> (including negligence), contract, or otherwise, shall any |
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> Contributor, or anyone who distributes Covered Software as |
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> permitted above, be liable to You for any direct, indirect, |
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> special, incidental, or consequential damages of any character |
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> including, without limitation, damages for lost profits, loss of |
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> goodwill, work stoppage, computer failure or malfunction, or any |
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> and all other commercial damages or losses, even if such party |
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> shall have been informed of the possibility of such damages. This |
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> limitation of liability shall not apply to liability for death or |
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> personal injury resulting from such party's negligence to the |
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> extent applicable law prohibits such limitation. Some |
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> jurisdictions do not allow the exclusion or limitation of |
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> incidental or consequential damages, so this exclusion and |
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> limitation may not apply to You. |
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|
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|
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### 8. Litigation |
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Any litigation relating to this License may be brought only in the |
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courts of a jurisdiction where the defendant maintains its principal |
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place of business and such litigation shall be governed by laws of that |
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jurisdiction, without reference to its conflict-of-law provisions. |
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Nothing in this Section shall prevent a party's ability to bring |
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cross-claims or counter-claims. |
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### 9. Miscellaneous |
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This License represents the complete agreement concerning the subject |
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matter hereof. If any provision of this License is held to be |
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unenforceable, such provision shall be reformed only to the extent |
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necessary to make it enforceable. Any law or regulation which provides |
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that the language of a contract shall be construed against the drafter |
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shall not be used to construe this License against a Contributor. |
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|
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### 10. Versions of the License |
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#### 10.1. New Versions |
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Mozilla Foundation is the license steward. Except as provided in Section |
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10.3, no one other than the license steward has the right to modify or |
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publish new versions of this License. Each version will be given a |
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distinguishing version number. |
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|
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#### 10.2. Effect of New Versions |
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You may distribute the Covered Software under the terms of the version |
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of the License under which You originally received the Covered Software, |
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or under the terms of any subsequent version published by the license |
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steward. |
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|
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#### 10.3. Modified Versions |
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If you create software not governed by this License, and you want to |
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create a new license for such software, you may create and use a |
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modified version of this License if you rename the license and remove |
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any references to the name of the license steward (except to note that |
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such modified license differs from this License). |
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|
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#### 10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses |
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|
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If You choose to distribute Source Code Form that is Incompatible With |
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Secondary Licenses under the terms of this version of the License, the |
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notice described in Exhibit B of this License must be attached. |
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|
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## Exhibit A - Source Code Form License Notice |
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|
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This Source Code Form is subject to the terms of the Mozilla Public |
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License, v. 2.0. If a copy of the MPL was not distributed with this |
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file, You can obtain one at http://mozilla.org/MPL/2.0/. |
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|
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If it is not possible or desirable to put the notice in a particular |
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file, then You may include the notice in a location (such as a LICENSE |
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file in a relevant directory) where a recipient would be likely to look |
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for such a notice. |
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|
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You may add additional accurate notices of copyright ownership. |
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|
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## Exhibit B - “Incompatible With Secondary Licenses” Notice |
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This Source Code Form is "Incompatible With Secondary Licenses", as |
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defined by the Mozilla Public License, v. 2.0. |
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@ -0,0 +1,214 @@ |
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package derivationpath |
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|
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import ( |
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"fmt" |
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"io" |
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"strconv" |
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"strings" |
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) |
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type StartingPoint int |
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const ( |
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tokenMaster = 0x6D // char m
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tokenSeparator = 0x2F // char /
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tokenHardened = 0x27 // char '
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tokenDot = 0x2E // char .
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|
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hardenedStart = 0x80000000 // 2^31
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) |
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const ( |
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StartingPointMaster StartingPoint = iota + 1 |
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StartingPointCurrent |
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StartingPointParent |
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) |
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|
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type parseFunc = func() error |
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|
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type decoder struct { |
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r *strings.Reader |
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f parseFunc |
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pos int |
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path []uint32 |
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start StartingPoint |
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currentToken string |
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currentTokenHardened bool |
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} |
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|
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func newDecoder(path string) *decoder { |
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d := &decoder{ |
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r: strings.NewReader(path), |
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} |
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|
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d.reset() |
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return d |
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} |
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|
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func (d *decoder) reset() { |
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d.r.Seek(0, io.SeekStart) |
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d.pos = 0 |
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d.start = StartingPointCurrent |
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d.f = d.parseStart |
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d.path = make([]uint32, 0) |
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d.resetCurrentToken() |
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} |
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|
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func (d *decoder) resetCurrentToken() { |
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d.currentToken = "" |
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d.currentTokenHardened = false |
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} |
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|
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func (d *decoder) parse() (StartingPoint, []uint32, error) { |
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for { |
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err := d.f() |
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if err != nil { |
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if err == io.EOF { |
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err = nil |
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} else { |
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err = fmt.Errorf("at position %d, %s", d.pos, err.Error()) |
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} |
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|
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return d.start, d.path, err |
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} |
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} |
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|
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return d.start, d.path, nil |
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} |
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|
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func (d *decoder) readByte() (byte, error) { |
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b, err := d.r.ReadByte() |
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if err != nil { |
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return b, err |
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} |
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|
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d.pos++ |
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|
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return b, nil |
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} |
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|
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func (d *decoder) unreadByte() error { |
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err := d.r.UnreadByte() |
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if err != nil { |
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return err |
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} |
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|
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d.pos-- |
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return nil |
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} |
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|
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func (d *decoder) parseStart() error { |
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b, err := d.readByte() |
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if err != nil { |
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return err |
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} |
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|
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if b == tokenMaster { |
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d.start = StartingPointMaster |
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d.f = d.parseSeparator |
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return nil |
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} |
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|
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if b == tokenDot { |
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b2, err := d.readByte() |
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if err != nil { |
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return err |
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} |
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|
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if b2 == tokenDot { |
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d.f = d.parseSeparator |
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d.start = StartingPointParent |
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return nil |
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} |
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|
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d.f = d.parseSeparator |
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d.start = StartingPointCurrent |
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return d.unreadByte() |
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} |
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|
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d.f = d.parseSegment |
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|
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return d.unreadByte() |
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} |
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|
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func (d *decoder) saveSegment() error { |
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if len(d.currentToken) > 0 { |
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i, err := strconv.ParseUint(d.currentToken, 10, 32) |
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if err != nil { |
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return err |
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} |
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|
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if i >= hardenedStart { |
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d.pos -= len(d.currentToken) - 1 |
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return fmt.Errorf("index must be lower than 2^31, got %d", i) |
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} |
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|
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if d.currentTokenHardened { |
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i += hardenedStart |
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} |
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|
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d.path = append(d.path, uint32(i)) |
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} |
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|
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d.f = d.parseSegment |
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d.resetCurrentToken() |
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|
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return nil |
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} |
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|
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func (d *decoder) parseSeparator() error { |
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b, err := d.readByte() |
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if err != nil { |
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return err |
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} |
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|
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if b == tokenSeparator { |
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return d.saveSegment() |
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} |
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|
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return fmt.Errorf("expected %s, got %s", string(tokenSeparator), string(b)) |
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} |
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|
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func (d *decoder) parseSegment() error { |
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b, err := d.readByte() |
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if err == io.EOF { |
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if len(d.currentToken) == 0 { |
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return fmt.Errorf("expected number, got EOF") |
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} |
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|
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if newErr := d.saveSegment(); newErr != nil { |
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return newErr |
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} |
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|
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return err |
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} |
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|
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if err != nil { |
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return err |
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} |
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|
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if len(d.currentToken) > 0 && b == tokenSeparator { |
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return d.saveSegment() |
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} |
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|
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if len(d.currentToken) > 0 && b == tokenHardened { |
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d.currentTokenHardened = true |
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d.f = d.parseSeparator |
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return nil |
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} |
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|
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if b < 0x30 || b > 0x39 { |
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return fmt.Errorf("expected number, got %s", string(b)) |
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} |
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|
||||
d.currentToken = fmt.Sprintf("%s%s", d.currentToken, string(b)) |
||||
|
||||
return nil |
||||
} |
||||
|
||||
func Decode(str string) (StartingPoint, []uint32, error) { |
||||
d := newDecoder(str) |
||||
return d.parse() |
||||
} |
||||
@ -0,0 +1,36 @@ |
||||
package derivationpath |
||||
|
||||
import ( |
||||
"bytes" |
||||
"encoding/binary" |
||||
"fmt" |
||||
"strings" |
||||
) |
||||
|
||||
func Encode(rawPath []uint32) string { |
||||
segments := []string{string(tokenMaster)} |
||||
|
||||
for _, i := range rawPath { |
||||
suffix := "" |
||||
|
||||
if i >= hardenedStart { |
||||
i = i - hardenedStart |
||||
suffix = string(tokenHardened) |
||||
} |
||||
|
||||
segments = append(segments, fmt.Sprintf("%d%s", i, suffix)) |
||||
} |
||||
|
||||
return strings.Join(segments, string(tokenSeparator)) |
||||
} |
||||
|
||||
func EncodeFromBytes(data []byte) (string, error) { |
||||
buf := bytes.NewBuffer(data) |
||||
rawPath := make([]uint32, buf.Len()/4) |
||||
err := binary.Read(buf, binary.BigEndian, &rawPath) |
||||
if err != nil { |
||||
return "", err |
||||
} |
||||
|
||||
return Encode(rawPath), nil |
||||
} |
||||
Loading…
Reference in new issue