├── COPYING ├── README ├── grc └── pocsag.grc └── src ├── .gitignore ├── Makefile └── pocsag.c /COPYING: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. By contrast, 16 | our General Public Licenses are intended to guarantee your freedom to 17 | share and change all versions of a program--to make sure it remains free 18 | software for all its users. 19 | 20 | When we speak of free software, we are referring to freedom, not 21 | price. Our General Public Licenses are designed to make sure that you 22 | have the freedom to distribute copies of free software (and charge for 23 | them if you wish), that you receive source code or can get it if you 24 | want it, that you can change the software or use pieces of it in new 25 | free programs, and that you know you can do these things. 26 | 27 | Developers that use our General Public Licenses protect your rights 28 | with two steps: (1) assert copyright on the software, and (2) offer 29 | you this License which gives you legal permission to copy, distribute 30 | and/or modify the software. 31 | 32 | A secondary benefit of defending all users' freedom is that 33 | improvements made in alternate versions of the program, if they 34 | receive widespread use, become available for other developers to 35 | incorporate. Many developers of free software are heartened and 36 | encouraged by the resulting cooperation. However, in the case of 37 | software used on network servers, this result may fail to come about. 38 | The GNU General Public License permits making a modified version and 39 | letting the public access it on a server without ever releasing its 40 | source code to the public. 41 | 42 | The GNU Affero General Public License is designed specifically to 43 | ensure that, in such cases, the modified source code becomes available 44 | to the community. It requires the operator of a network server to 45 | provide the source code of the modified version running there to the 46 | users of that server. Therefore, public use of a modified version, on 47 | a publicly accessible server, gives the public access to the source 48 | code of the modified version. 49 | 50 | An older license, called the Affero General Public License and 51 | published by Affero, was designed to accomplish similar goals. This is 52 | a different license, not a version of the Affero GPL, but Affero has 53 | released a new version of the Affero GPL which permits relicensing under 54 | this license. 55 | 56 | The precise terms and conditions for copying, distribution and 57 | modification follow. 58 | 59 | TERMS AND CONDITIONS 60 | 61 | 0. Definitions. 62 | 63 | "This License" refers to version 3 of the GNU Affero General Public License. 64 | 65 | "Copyright" also means copyright-like laws that apply to other kinds of 66 | works, such as semiconductor masks. 67 | 68 | "The Program" refers to any copyrightable work licensed under this 69 | License. Each licensee is addressed as "you". "Licensees" and 70 | "recipients" may be individuals or organizations. 71 | 72 | To "modify" a work means to copy from or adapt all or part of the work 73 | in a fashion requiring copyright permission, other than the making of an 74 | exact copy. The resulting work is called a "modified version" of the 75 | earlier work or a work "based on" the earlier work. 76 | 77 | A "covered work" means either the unmodified Program or a work based 78 | on the Program. 79 | 80 | To "propagate" a work means to do anything with it that, without 81 | permission, would make you directly or secondarily liable for 82 | infringement under applicable copyright law, except executing it on a 83 | computer or modifying a private copy. Propagation includes copying, 84 | distribution (with or without modification), making available to the 85 | public, and in some countries other activities as well. 86 | 87 | To "convey" a work means any kind of propagation that enables other 88 | parties to make or receive copies. Mere interaction with a user through 89 | a computer network, with no transfer of a copy, is not conveying. 90 | 91 | An interactive user interface displays "Appropriate Legal Notices" 92 | to the extent that it includes a convenient and prominently visible 93 | feature that (1) displays an appropriate copyright notice, and (2) 94 | tells the user that there is no warranty for the work (except to the 95 | extent that warranties are provided), that licensees may convey the 96 | work under this License, and how to view a copy of this License. If 97 | the interface presents a list of user commands or options, such as a 98 | menu, a prominent item in the list meets this criterion. 99 | 100 | 1. Source Code. 101 | 102 | The "source code" for a work means the preferred form of the work 103 | for making modifications to it. "Object code" means any non-source 104 | form of a work. 105 | 106 | A "Standard Interface" means an interface that either is an official 107 | standard defined by a recognized standards body, or, in the case of 108 | interfaces specified for a particular programming language, one that 109 | is widely used among developers working in that language. 110 | 111 | The "System Libraries" of an executable work include anything, other 112 | than the work as a whole, that (a) is included in the normal form of 113 | packaging a Major Component, but which is not part of that Major 114 | Component, and (b) serves only to enable use of the work with that 115 | Major Component, or to implement a Standard Interface for which an 116 | implementation is available to the public in source code form. A 117 | "Major Component", in this context, means a major essential component 118 | (kernel, window system, and so on) of the specific operating system 119 | (if any) on which the executable work runs, or a compiler used to 120 | produce the work, or an object code interpreter used to run it. 121 | 122 | The "Corresponding Source" for a work in object code form means all 123 | the source code needed to generate, install, and (for an executable 124 | work) run the object code and to modify the work, including scripts to 125 | control those activities. However, it does not include the work's 126 | System Libraries, or general-purpose tools or generally available free 127 | programs which are used unmodified in performing those activities but 128 | which are not part of the work. For example, Corresponding Source 129 | includes interface definition files associated with source files for 130 | the work, and the source code for shared libraries and dynamically 131 | linked subprograms that the work is specifically designed to require, 132 | such as by intimate data communication or control flow between those 133 | subprograms and other parts of the work. 134 | 135 | The Corresponding Source need not include anything that users 136 | can regenerate automatically from other parts of the Corresponding 137 | Source. 138 | 139 | The Corresponding Source for a work in source code form is that 140 | same work. 141 | 142 | 2. Basic Permissions. 143 | 144 | All rights granted under this License are granted for the term of 145 | copyright on the Program, and are irrevocable provided the stated 146 | conditions are met. This License explicitly affirms your unlimited 147 | permission to run the unmodified Program. The output from running a 148 | covered work is covered by this License only if the output, given its 149 | content, constitutes a covered work. This License acknowledges your 150 | rights of fair use or other equivalent, as provided by copyright law. 151 | 152 | You may make, run and propagate covered works that you do not 153 | convey, without conditions so long as your license otherwise remains 154 | in force. You may convey covered works to others for the sole purpose 155 | of having them make modifications exclusively for you, or provide you 156 | with facilities for running those works, provided that you comply with 157 | the terms of this License in conveying all material for which you do 158 | not control copyright. Those thus making or running the covered works 159 | for you must do so exclusively on your behalf, under your direction 160 | and control, on terms that prohibit them from making any copies of 161 | your copyrighted material outside their relationship with you. 162 | 163 | Conveying under any other circumstances is permitted solely under 164 | the conditions stated below. Sublicensing is not allowed; section 10 165 | makes it unnecessary. 166 | 167 | 3. Protecting Users' Legal Rights From Anti-Circumvention Law. 168 | 169 | No covered work shall be deemed part of an effective technological 170 | measure under any applicable law fulfilling obligations under article 171 | 11 of the WIPO copyright treaty adopted on 20 December 1996, or 172 | similar laws prohibiting or restricting circumvention of such 173 | measures. 174 | 175 | When you convey a covered work, you waive any legal power to forbid 176 | circumvention of technological measures to the extent such circumvention 177 | is effected by exercising rights under this License with respect to 178 | the covered work, and you disclaim any intention to limit operation or 179 | modification of the work as a means of enforcing, against the work's 180 | users, your or third parties' legal rights to forbid circumvention of 181 | technological measures. 182 | 183 | 4. Conveying Verbatim Copies. 184 | 185 | You may convey verbatim copies of the Program's source code as you 186 | receive it, in any medium, provided that you conspicuously and 187 | appropriately publish on each copy an appropriate copyright notice; 188 | keep intact all notices stating that this License and any 189 | non-permissive terms added in accord with section 7 apply to the code; 190 | keep intact all notices of the absence of any warranty; and give all 191 | recipients a copy of this License along with the Program. 192 | 193 | You may charge any price or no price for each copy that you convey, 194 | and you may offer support or warranty protection for a fee. 195 | 196 | 5. Conveying Modified Source Versions. 197 | 198 | You may convey a work based on the Program, or the modifications to 199 | produce it from the Program, in the form of source code under the 200 | terms of section 4, provided that you also meet all of these conditions: 201 | 202 | a) The work must carry prominent notices stating that you modified 203 | it, and giving a relevant date. 204 | 205 | b) The work must carry prominent notices stating that it is 206 | released under this License and any conditions added under section 207 | 7. This requirement modifies the requirement in section 4 to 208 | "keep intact all notices". 209 | 210 | c) You must license the entire work, as a whole, under this 211 | License to anyone who comes into possession of a copy. This 212 | License will therefore apply, along with any applicable section 7 213 | additional terms, to the whole of the work, and all its parts, 214 | regardless of how they are packaged. This License gives no 215 | permission to license the work in any other way, but it does not 216 | invalidate such permission if you have separately received it. 217 | 218 | d) If the work has interactive user interfaces, each must display 219 | Appropriate Legal Notices; however, if the Program has interactive 220 | interfaces that do not display Appropriate Legal Notices, your 221 | work need not make them do so. 222 | 223 | A compilation of a covered work with other separate and independent 224 | works, which are not by their nature extensions of the covered work, 225 | and which are not combined with it such as to form a larger program, 226 | in or on a volume of a storage or distribution medium, is called an 227 | "aggregate" if the compilation and its resulting copyright are not 228 | used to limit the access or legal rights of the compilation's users 229 | beyond what the individual works permit. Inclusion of a covered work 230 | in an aggregate does not cause this License to apply to the other 231 | parts of the aggregate. 232 | 233 | 6. Conveying Non-Source Forms. 234 | 235 | You may convey a covered work in object code form under the terms 236 | of sections 4 and 5, provided that you also convey the 237 | machine-readable Corresponding Source under the terms of this License, 238 | in one of these ways: 239 | 240 | a) Convey the object code in, or embodied in, a physical product 241 | (including a physical distribution medium), accompanied by the 242 | Corresponding Source fixed on a durable physical medium 243 | customarily used for software interchange. 244 | 245 | b) Convey the object code in, or embodied in, a physical product 246 | (including a physical distribution medium), accompanied by a 247 | written offer, valid for at least three years and valid for as 248 | long as you offer spare parts or customer support for that product 249 | model, to give anyone who possesses the object code either (1) a 250 | copy of the Corresponding Source for all the software in the 251 | product that is covered by this License, on a durable physical 252 | medium customarily used for software interchange, for a price no 253 | more than your reasonable cost of physically performing this 254 | conveying of source, or (2) access to copy the 255 | Corresponding Source from a network server at no charge. 256 | 257 | c) Convey individual copies of the object code with a copy of the 258 | written offer to provide the Corresponding Source. This 259 | alternative is allowed only occasionally and noncommercially, and 260 | only if you received the object code with such an offer, in accord 261 | with subsection 6b. 262 | 263 | d) Convey the object code by offering access from a designated 264 | place (gratis or for a charge), and offer equivalent access to the 265 | Corresponding Source in the same way through the same place at no 266 | further charge. You need not require recipients to copy the 267 | Corresponding Source along with the object code. If the place to 268 | copy the object code is a network server, the Corresponding Source 269 | may be on a different server (operated by you or a third party) 270 | that supports equivalent copying facilities, provided you maintain 271 | clear directions next to the object code saying where to find the 272 | Corresponding Source. Regardless of what server hosts the 273 | Corresponding Source, you remain obligated to ensure that it is 274 | available for as long as needed to satisfy these requirements. 275 | 276 | e) Convey the object code using peer-to-peer transmission, provided 277 | you inform other peers where the object code and Corresponding 278 | Source of the work are being offered to the general public at no 279 | charge under subsection 6d. 280 | 281 | A separable portion of the object code, whose source code is excluded 282 | from the Corresponding Source as a System Library, need not be 283 | included in conveying the object code work. 284 | 285 | A "User Product" is either (1) a "consumer product", which means any 286 | tangible personal property which is normally used for personal, family, 287 | or household purposes, or (2) anything designed or sold for incorporation 288 | into a dwelling. In determining whether a product is a consumer product, 289 | doubtful cases shall be resolved in favor of coverage. For a particular 290 | product received by a particular user, "normally used" refers to a 291 | typical or common use of that class of product, regardless of the status 292 | of the particular user or of the way in which the particular user 293 | actually uses, or expects or is expected to use, the product. A product 294 | is a consumer product regardless of whether the product has substantial 295 | commercial, industrial or non-consumer uses, unless such uses represent 296 | the only significant mode of use of the product. 297 | 298 | "Installation Information" for a User Product means any methods, 299 | procedures, authorization keys, or other information required to install 300 | and execute modified versions of a covered work in that User Product from 301 | a modified version of its Corresponding Source. The information must 302 | suffice to ensure that the continued functioning of the modified object 303 | code is in no case prevented or interfered with solely because 304 | modification has been made. 305 | 306 | If you convey an object code work under this section in, or with, or 307 | specifically for use in, a User Product, and the conveying occurs as 308 | part of a transaction in which the right of possession and use of the 309 | User Product is transferred to the recipient in perpetuity or for a 310 | fixed term (regardless of how the transaction is characterized), the 311 | Corresponding Source conveyed under this section must be accompanied 312 | by the Installation Information. But this requirement does not apply 313 | if neither you nor any third party retains the ability to install 314 | modified object code on the User Product (for example, the work has 315 | been installed in ROM). 316 | 317 | The requirement to provide Installation Information does not include a 318 | requirement to continue to provide support service, warranty, or updates 319 | for a work that has been modified or installed by the recipient, or for 320 | the User Product in which it has been modified or installed. Access to a 321 | network may be denied when the modification itself materially and 322 | adversely affects the operation of the network or violates the rules and 323 | protocols for communication across the network. 324 | 325 | Corresponding Source conveyed, and Installation Information provided, 326 | in accord with this section must be in a format that is publicly 327 | documented (and with an implementation available to the public in 328 | source code form), and must require no special password or key for 329 | unpacking, reading or copying. 330 | 331 | 7. Additional Terms. 332 | 333 | "Additional permissions" are terms that supplement the terms of this 334 | License by making exceptions from one or more of its conditions. 335 | Additional permissions that are applicable to the entire Program shall 336 | be treated as though they were included in this License, to the extent 337 | that they are valid under applicable law. If additional permissions 338 | apply only to part of the Program, that part may be used separately 339 | under those permissions, but the entire Program remains governed by 340 | this License without regard to the additional permissions. 341 | 342 | When you convey a copy of a covered work, you may at your option 343 | remove any additional permissions from that copy, or from any part of 344 | it. (Additional permissions may be written to require their own 345 | removal in certain cases when you modify the work.) You may place 346 | additional permissions on material, added by you to a covered work, 347 | for which you have or can give appropriate copyright permission. 348 | 349 | Notwithstanding any other provision of this License, for material you 350 | add to a covered work, you may (if authorized by the copyright holders of 351 | that material) supplement the terms of this License with terms: 352 | 353 | a) Disclaiming warranty or limiting liability differently from the 354 | terms of sections 15 and 16 of this License; or 355 | 356 | b) Requiring preservation of specified reasonable legal notices or 357 | author attributions in that material or in the Appropriate Legal 358 | Notices displayed by works containing it; or 359 | 360 | c) Prohibiting misrepresentation of the origin of that material, or 361 | requiring that modified versions of such material be marked in 362 | reasonable ways as different from the original version; or 363 | 364 | d) Limiting the use for publicity purposes of names of licensors or 365 | authors of the material; or 366 | 367 | e) Declining to grant rights under trademark law for use of some 368 | trade names, trademarks, or service marks; or 369 | 370 | f) Requiring indemnification of licensors and authors of that 371 | material by anyone who conveys the material (or modified versions of 372 | it) with contractual assumptions of liability to the recipient, for 373 | any liability that these contractual assumptions directly impose on 374 | those licensors and authors. 375 | 376 | All other non-permissive additional terms are considered "further 377 | restrictions" within the meaning of section 10. If the Program as you 378 | received it, or any part of it, contains a notice stating that it is 379 | governed by this License along with a term that is a further 380 | restriction, you may remove that term. If a license document contains 381 | a further restriction but permits relicensing or conveying under this 382 | License, you may add to a covered work material governed by the terms 383 | of that license document, provided that the further restriction does 384 | not survive such relicensing or conveying. 385 | 386 | If you add terms to a covered work in accord with this section, you 387 | must place, in the relevant source files, a statement of the 388 | additional terms that apply to those files, or a notice indicating 389 | where to find the applicable terms. 390 | 391 | Additional terms, permissive or non-permissive, may be stated in the 392 | form of a separately written license, or stated as exceptions; 393 | the above requirements apply either way. 394 | 395 | 8. Termination. 396 | 397 | You may not propagate or modify a covered work except as expressly 398 | provided under this License. Any attempt otherwise to propagate or 399 | modify it is void, and will automatically terminate your rights under 400 | this License (including any patent licenses granted under the third 401 | paragraph of section 11). 402 | 403 | However, if you cease all violation of this License, then your 404 | license from a particular copyright holder is reinstated (a) 405 | provisionally, unless and until the copyright holder explicitly and 406 | finally terminates your license, and (b) permanently, if the copyright 407 | holder fails to notify you of the violation by some reasonable means 408 | prior to 60 days after the cessation. 409 | 410 | Moreover, your license from a particular copyright holder is 411 | reinstated permanently if the copyright holder notifies you of the 412 | violation by some reasonable means, this is the first time you have 413 | received notice of violation of this License (for any work) from that 414 | copyright holder, and you cure the violation prior to 30 days after 415 | your receipt of the notice. 416 | 417 | Termination of your rights under this section does not terminate the 418 | licenses of parties who have received copies or rights from you under 419 | this License. If your rights have been terminated and not permanently 420 | reinstated, you do not qualify to receive new licenses for the same 421 | material under section 10. 422 | 423 | 9. Acceptance Not Required for Having Copies. 424 | 425 | You are not required to accept this License in order to receive or 426 | run a copy of the Program. Ancillary propagation of a covered work 427 | occurring solely as a consequence of using peer-to-peer transmission 428 | to receive a copy likewise does not require acceptance. However, 429 | nothing other than this License grants you permission to propagate or 430 | modify any covered work. These actions infringe copyright if you do 431 | not accept this License. Therefore, by modifying or propagating a 432 | covered work, you indicate your acceptance of this License to do so. 433 | 434 | 10. Automatic Licensing of Downstream Recipients. 435 | 436 | Each time you convey a covered work, the recipient automatically 437 | receives a license from the original licensors, to run, modify and 438 | propagate that work, subject to this License. You are not responsible 439 | for enforcing compliance by third parties with this License. 440 | 441 | An "entity transaction" is a transaction transferring control of an 442 | organization, or substantially all assets of one, or subdividing an 443 | organization, or merging organizations. If propagation of a covered 444 | work results from an entity transaction, each party to that 445 | transaction who receives a copy of the work also receives whatever 446 | licenses to the work the party's predecessor in interest had or could 447 | give under the previous paragraph, plus a right to possession of the 448 | Corresponding Source of the work from the predecessor in interest, if 449 | the predecessor has it or can get it with reasonable efforts. 450 | 451 | You may not impose any further restrictions on the exercise of the 452 | rights granted or affirmed under this License. For example, you may 453 | not impose a license fee, royalty, or other charge for exercise of 454 | rights granted under this License, and you may not initiate litigation 455 | (including a cross-claim or counterclaim in a lawsuit) alleging that 456 | any patent claim is infringed by making, using, selling, offering for 457 | sale, or importing the Program or any portion of it. 458 | 459 | 11. Patents. 460 | 461 | A "contributor" is a copyright holder who authorizes use under this 462 | License of the Program or a work on which the Program is based. The 463 | work thus licensed is called the contributor's "contributor version". 464 | 465 | A contributor's "essential patent claims" are all patent claims 466 | owned or controlled by the contributor, whether already acquired or 467 | hereafter acquired, that would be infringed by some manner, permitted 468 | by this License, of making, using, or selling its contributor version, 469 | but do not include claims that would be infringed only as a 470 | consequence of further modification of the contributor version. For 471 | purposes of this definition, "control" includes the right to grant 472 | patent sublicenses in a manner consistent with the requirements of 473 | this License. 474 | 475 | Each contributor grants you a non-exclusive, worldwide, royalty-free 476 | patent license under the contributor's essential patent claims, to 477 | make, use, sell, offer for sale, import and otherwise run, modify and 478 | propagate the contents of its contributor version. 479 | 480 | In the following three paragraphs, a "patent license" is any express 481 | agreement or commitment, however denominated, not to enforce a patent 482 | (such as an express permission to practice a patent or covenant not to 483 | sue for patent infringement). To "grant" such a patent license to a 484 | party means to make such an agreement or commitment not to enforce a 485 | patent against the party. 486 | 487 | If you convey a covered work, knowingly relying on a patent license, 488 | and the Corresponding Source of the work is not available for anyone 489 | to copy, free of charge and under the terms of this License, through a 490 | publicly available network server or other readily accessible means, 491 | then you must either (1) cause the Corresponding Source to be so 492 | available, or (2) arrange to deprive yourself of the benefit of the 493 | patent license for this particular work, or (3) arrange, in a manner 494 | consistent with the requirements of this License, to extend the patent 495 | license to downstream recipients. "Knowingly relying" means you have 496 | actual knowledge that, but for the patent license, your conveying the 497 | covered work in a country, or your recipient's use of the covered work 498 | in a country, would infringe one or more identifiable patents in that 499 | country that you have reason to believe are valid. 500 | 501 | If, pursuant to or in connection with a single transaction or 502 | arrangement, you convey, or propagate by procuring conveyance of, a 503 | covered work, and grant a patent license to some of the parties 504 | receiving the covered work authorizing them to use, propagate, modify 505 | or convey a specific copy of the covered work, then the patent license 506 | you grant is automatically extended to all recipients of the covered 507 | work and works based on it. 508 | 509 | A patent license is "discriminatory" if it does not include within 510 | the scope of its coverage, prohibits the exercise of, or is 511 | conditioned on the non-exercise of one or more of the rights that are 512 | specifically granted under this License. You may not convey a covered 513 | work if you are a party to an arrangement with a third party that is 514 | in the business of distributing software, under which you make payment 515 | to the third party based on the extent of your activity of conveying 516 | the work, and under which the third party grants, to any of the 517 | parties who would receive the covered work from you, a discriminatory 518 | patent license (a) in connection with copies of the covered work 519 | conveyed by you (or copies made from those copies), or (b) primarily 520 | for and in connection with specific products or compilations that 521 | contain the covered work, unless you entered into that arrangement, 522 | or that patent license was granted, prior to 28 March 2007. 523 | 524 | Nothing in this License shall be construed as excluding or limiting 525 | any implied license or other defenses to infringement that may 526 | otherwise be available to you under applicable patent law. 527 | 528 | 12. No Surrender of Others' Freedom. 529 | 530 | If conditions are imposed on you (whether by court order, agreement or 531 | otherwise) that contradict the conditions of this License, they do not 532 | excuse you from the conditions of this License. If you cannot convey a 533 | covered work so as to satisfy simultaneously your obligations under this 534 | License and any other pertinent obligations, then as a consequence you may 535 | not convey it at all. For example, if you agree to terms that obligate you 536 | to collect a royalty for further conveying from those to whom you convey 537 | the Program, the only way you could satisfy both those terms and this 538 | License would be to refrain entirely from conveying the Program. 539 | 540 | 13. Remote Network Interaction; Use with the GNU General Public License. 541 | 542 | Notwithstanding any other provision of this License, if you modify the 543 | Program, your modified version must prominently offer all users 544 | interacting with it remotely through a computer network (if your version 545 | supports such interaction) an opportunity to receive the Corresponding 546 | Source of your version by providing access to the Corresponding Source 547 | from a network server at no charge, through some standard or customary 548 | means of facilitating copying of software. This Corresponding Source 549 | shall include the Corresponding Source for any work covered by version 3 550 | of the GNU General Public License that is incorporated pursuant to the 551 | following paragraph. 552 | 553 | Notwithstanding any other provision of this License, you have 554 | permission to link or combine any covered work with a work licensed 555 | under version 3 of the GNU General Public License into a single 556 | combined work, and to convey the resulting work. The terms of this 557 | License will continue to apply to the part which is the covered work, 558 | but the work with which it is combined will remain governed by version 559 | 3 of the GNU General Public License. 560 | 561 | 14. Revised Versions of this License. 562 | 563 | The Free Software Foundation may publish revised and/or new versions of 564 | the GNU Affero General Public License from time to time. Such new versions 565 | will be similar in spirit to the present version, but may differ in detail to 566 | address new problems or concerns. 567 | 568 | Each version is given a distinguishing version number. If the 569 | Program specifies that a certain numbered version of the GNU Affero General 570 | Public License "or any later version" applies to it, you have the 571 | option of following the terms and conditions either of that numbered 572 | version or of any later version published by the Free Software 573 | Foundation. If the Program does not specify a version number of the 574 | GNU Affero General Public License, you may choose any version ever published 575 | by the Free Software Foundation. 576 | 577 | If the Program specifies that a proxy can decide which future 578 | versions of the GNU Affero General Public License can be used, that proxy's 579 | public statement of acceptance of a version permanently authorizes you 580 | to choose that version for the Program. 581 | 582 | Later license versions may give you additional or different 583 | permissions. However, no additional obligations are imposed on any 584 | author or copyright holder as a result of your choosing to follow a 585 | later version. 586 | 587 | 15. Disclaimer of Warranty. 588 | 589 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 590 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 591 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 592 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 593 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 594 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 595 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 596 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 597 | 598 | 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published by 637 | the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README: -------------------------------------------------------------------------------- 1 | Quick & Dirty POCSAG code 2 | 3 | by Sylvain Munaut 4 | -------------------------------------------------------------------------------- /grc/pocsag.grc: -------------------------------------------------------------------------------- 1 | 2 | 3 | Sun Apr 8 21:37:28 2012 4 | 5 | options 6 | 7 | id 8 | top_block 9 | 10 | 11 | _enabled 12 | True 13 | 14 | 15 | title 16 | 17 | 18 | 19 | author 20 | 21 | 22 | 23 | description 24 | 25 | 26 | 27 | window_size 28 | 1280, 1024 29 | 30 | 31 | generate_options 32 | wx_gui 33 | 34 | 35 | category 36 | Custom 37 | 38 | 39 | run_options 40 | prompt 41 | 42 | 43 | run 44 | True 45 | 46 | 47 | realtime_scheduling 48 | 49 | 50 | 51 | _coordinate 52 | (10, 10) 53 | 54 | 55 | _rotation 56 | 0 57 | 58 | 59 | 60 | variable 61 | 62 | id 63 | samp_rate 64 | 65 | 66 | _enabled 67 | True 68 | 69 | 70 | value 71 | 100000 72 | 73 | 74 | _coordinate 75 | (195, 11) 76 | 77 | 78 | _rotation 79 | 0 80 | 81 | 82 | 83 | variable 84 | 85 | id 86 | freq_shift 87 | 88 | 89 | _enabled 90 | True 91 | 92 | 93 | value 94 | -30e3 95 | 96 | 97 | _coordinate 98 | (300, 12) 99 | 100 | 101 | _rotation 102 | 0 103 | 104 | 105 | 106 | variable 107 | 108 | id 109 | sym_rate 110 | 111 | 112 | _enabled 113 | True 114 | 115 | 116 | value 117 | 2400 118 | 119 | 120 | _coordinate 121 | (401, 13) 122 | 123 | 124 | _rotation 125 | 0 126 | 127 | 128 | 129 | variable 130 | 131 | id 132 | sps 133 | 134 | 135 | _enabled 136 | True 137 | 138 | 139 | value 140 | 8 141 | 142 | 143 | _coordinate 144 | (501, 13) 145 | 146 | 147 | _rotation 148 | 0 149 | 150 | 151 | 152 | variable 153 | 154 | id 155 | fm_deviation 156 | 157 | 158 | _enabled 159 | True 160 | 161 | 162 | value 163 | 4.5e3 164 | 165 | 166 | _coordinate 167 | (826, 17) 168 | 169 | 170 | _rotation 171 | 0 172 | 173 | 174 | 175 | variable 176 | 177 | id 178 | PI 179 | 180 | 181 | _enabled 182 | True 183 | 184 | 185 | value 186 | 3.1415926 187 | 188 | 189 | _coordinate 190 | (941, 17) 191 | 192 | 193 | _rotation 194 | 0 195 | 196 | 197 | 198 | gr_freq_xlating_fir_filter_xxx 199 | 200 | id 201 | gr_freq_xlating_fir_filter_xxx_0 202 | 203 | 204 | _enabled 205 | True 206 | 207 | 208 | type 209 | ccc 210 | 211 | 212 | decim 213 | 1 214 | 215 | 216 | taps 217 | gr.firdes.low_pass(1.0, samp_rate, 10e3, 5e3) 218 | 219 | 220 | center_freq 221 | freq_shift 222 | 223 | 224 | samp_rate 225 | samp_rate 226 | 227 | 228 | _coordinate 229 | (238, 257) 230 | 231 | 232 | _rotation 233 | 0 234 | 235 | 236 | 237 | gr_throttle 238 | 239 | id 240 | gr_throttle_0 241 | 242 | 243 | _enabled 244 | True 245 | 246 | 247 | type 248 | complex 249 | 250 | 251 | samples_per_second 252 | samp_rate 253 | 254 | 255 | vlen 256 | 1 257 | 258 | 259 | _coordinate 260 | (252, 120) 261 | 262 | 263 | _rotation 264 | 0 265 | 266 | 267 | 268 | gr_fractional_interpolator_xx 269 | 270 | id 271 | gr_fractional_interpolator_xx_0 272 | 273 | 274 | _enabled 275 | True 276 | 277 | 278 | type 279 | complex 280 | 281 | 282 | phase_shift 283 | 0 284 | 285 | 286 | interp_ratio 287 | 1.0 * samp_rate / (sym_rate * sps) 288 | 289 | 290 | _coordinate 291 | (518, 273) 292 | 293 | 294 | _rotation 295 | 0 296 | 297 | 298 | 299 | gr_quadrature_demod_cf 300 | 301 | id 302 | gr_quadrature_demod_cf_0 303 | 304 | 305 | _enabled 306 | True 307 | 308 | 309 | gain 310 | (sym_rate * sps) / (fm_deviation * 4) 311 | 312 | 313 | _coordinate 314 | (75, 412) 315 | 316 | 317 | _rotation 318 | 0 319 | 320 | 321 | 322 | low_pass_filter 323 | 324 | id 325 | low_pass_filter_0 326 | 327 | 328 | _enabled 329 | True 330 | 331 | 332 | type 333 | fir_filter_fff 334 | 335 | 336 | decim 337 | 1 338 | 339 | 340 | interp 341 | 1 342 | 343 | 344 | gain 345 | 1 346 | 347 | 348 | samp_rate 349 | sym_rate * sps 350 | 351 | 352 | cutoff_freq 353 | sym_rate * 2 354 | 355 | 356 | width 357 | sym_rate / 2 358 | 359 | 360 | win 361 | firdes.WIN_HAMMING 362 | 363 | 364 | beta 365 | 6.76 366 | 367 | 368 | _coordinate 369 | (312, 442) 370 | 371 | 372 | _rotation 373 | 0 374 | 375 | 376 | 377 | gr_file_sink 378 | 379 | id 380 | gr_file_sink_0 381 | 382 | 383 | _enabled 384 | True 385 | 386 | 387 | file 388 | /tmp/out.bits 389 | 390 | 391 | type 392 | byte 393 | 394 | 395 | vlen 396 | 1 397 | 398 | 399 | unbuffered 400 | False 401 | 402 | 403 | _coordinate 404 | (830, 748) 405 | 406 | 407 | _rotation 408 | 0 409 | 410 | 411 | 412 | digital_clock_recovery_mm_xx 413 | 414 | id 415 | digital_clock_recovery_mm_xx_0 416 | 417 | 418 | _enabled 419 | True 420 | 421 | 422 | type 423 | float 424 | 425 | 426 | omega 427 | sps 428 | 429 | 430 | gain_omega 431 | 0.03 * 0.03 * 0.3 432 | 433 | 434 | mu 435 | 0.4 436 | 437 | 438 | gain_mu 439 | 0.03 440 | 441 | 442 | omega_relative_limit 443 | 1e-4 444 | 445 | 446 | _coordinate 447 | (88, 634) 448 | 449 | 450 | _rotation 451 | 0 452 | 453 | 454 | 455 | digital_binary_slicer_fb 456 | 457 | id 458 | digital_binary_slicer_fb_0 459 | 460 | 461 | _enabled 462 | True 463 | 464 | 465 | _coordinate 466 | (541, 760) 467 | 468 | 469 | _rotation 470 | 0 471 | 472 | 473 | 474 | wxgui_fftsink2 475 | 476 | id 477 | wxgui_fftsink2_0 478 | 479 | 480 | _enabled 481 | False 482 | 483 | 484 | type 485 | complex 486 | 487 | 488 | title 489 | FFT Plot 490 | 491 | 492 | samp_rate 493 | 19200 494 | 495 | 496 | baseband_freq 497 | 0 498 | 499 | 500 | y_per_div 501 | 10 502 | 503 | 504 | y_divs 505 | 10 506 | 507 | 508 | ref_level 509 | 0 510 | 511 | 512 | ref_scale 513 | 2.0 514 | 515 | 516 | fft_size 517 | 1024 518 | 519 | 520 | fft_rate 521 | 15 522 | 523 | 524 | peak_hold 525 | True 526 | 527 | 528 | average 529 | False 530 | 531 | 532 | avg_alpha 533 | 0 534 | 535 | 536 | win 537 | None 538 | 539 | 540 | win_size 541 | 542 | 543 | 544 | grid_pos 545 | 546 | 547 | 548 | notebook 549 | 550 | 551 | 552 | _coordinate 553 | (875, 209) 554 | 555 | 556 | _rotation 557 | 0 558 | 559 | 560 | 561 | wxgui_scopesink2 562 | 563 | id 564 | wxgui_scopesink2_0 565 | 566 | 567 | _enabled 568 | False 569 | 570 | 571 | type 572 | float 573 | 574 | 575 | title 576 | Scope Plot 577 | 578 | 579 | samp_rate 580 | sym_rate * sps 581 | 582 | 583 | v_scale 584 | 0 585 | 586 | 587 | v_offset 588 | 0 589 | 590 | 591 | t_scale 592 | 0 593 | 594 | 595 | ac_couple 596 | False 597 | 598 | 599 | xy_mode 600 | False 601 | 602 | 603 | num_inputs 604 | 2 605 | 606 | 607 | win_size 608 | 609 | 610 | 611 | grid_pos 612 | 613 | 614 | 615 | notebook 616 | 617 | 618 | 619 | trig_mode 620 | gr.gr_TRIG_MODE_AUTO 621 | 622 | 623 | y_axis_label 624 | Counts 625 | 626 | 627 | _coordinate 628 | (868, 405) 629 | 630 | 631 | _rotation 632 | 0 633 | 634 | 635 | 636 | wxgui_scopesink2 637 | 638 | id 639 | wxgui_scopesink2_1 640 | 641 | 642 | _enabled 643 | False 644 | 645 | 646 | type 647 | float 648 | 649 | 650 | title 651 | Scope Plot 652 | 653 | 654 | samp_rate 655 | sym_rate 656 | 657 | 658 | v_scale 659 | 0 660 | 661 | 662 | v_offset 663 | 0 664 | 665 | 666 | t_scale 667 | 0 668 | 669 | 670 | ac_couple 671 | False 672 | 673 | 674 | xy_mode 675 | False 676 | 677 | 678 | num_inputs 679 | 1 680 | 681 | 682 | win_size 683 | 684 | 685 | 686 | grid_pos 687 | 688 | 689 | 690 | notebook 691 | 692 | 693 | 694 | trig_mode 695 | gr.gr_TRIG_MODE_AUTO 696 | 697 | 698 | y_axis_label 699 | Counts 700 | 701 | 702 | _coordinate 703 | (846, 602) 704 | 705 | 706 | _rotation 707 | 0 708 | 709 | 710 | 711 | gr_file_source 712 | 713 | id 714 | gr_file_source_0 715 | 716 | 717 | _enabled 718 | True 719 | 720 | 721 | file 722 | /tmp/pocsag.cfile 723 | 724 | 725 | type 726 | complex 727 | 728 | 729 | repeat 730 | False 731 | 732 | 733 | vlen 734 | 1 735 | 736 | 737 | _coordinate 738 | (3, 113) 739 | 740 | 741 | _rotation 742 | 0 743 | 744 | 745 | 746 | gr_freq_xlating_fir_filter_xxx_0 747 | gr_fractional_interpolator_xx_0 748 | 0 749 | 0 750 | 751 | 752 | gr_fractional_interpolator_xx_0 753 | wxgui_fftsink2_0 754 | 0 755 | 0 756 | 757 | 758 | gr_file_source_0 759 | gr_throttle_0 760 | 0 761 | 0 762 | 763 | 764 | gr_throttle_0 765 | gr_freq_xlating_fir_filter_xxx_0 766 | 0 767 | 0 768 | 769 | 770 | digital_clock_recovery_mm_xx_0 771 | digital_binary_slicer_fb_0 772 | 0 773 | 0 774 | 775 | 776 | gr_fractional_interpolator_xx_0 777 | gr_quadrature_demod_cf_0 778 | 0 779 | 0 780 | 781 | 782 | gr_quadrature_demod_cf_0 783 | wxgui_scopesink2_0 784 | 0 785 | 0 786 | 787 | 788 | gr_quadrature_demod_cf_0 789 | low_pass_filter_0 790 | 0 791 | 0 792 | 793 | 794 | low_pass_filter_0 795 | wxgui_scopesink2_0 796 | 0 797 | 1 798 | 799 | 800 | low_pass_filter_0 801 | digital_clock_recovery_mm_xx_0 802 | 0 803 | 0 804 | 805 | 806 | digital_binary_slicer_fb_0 807 | gr_file_sink_0 808 | 0 809 | 0 810 | 811 | 812 | digital_clock_recovery_mm_xx_0 813 | wxgui_scopesink2_1 814 | 0 815 | 0 816 | 817 | 818 | -------------------------------------------------------------------------------- /src/.gitignore: -------------------------------------------------------------------------------- 1 | *.o 2 | .*.swp 3 | pocsag 4 | -------------------------------------------------------------------------------- /src/Makefile: -------------------------------------------------------------------------------- 1 | CC=gcc 2 | CFLAGS = -g -O2 -Wall 3 | 4 | pocsag: pocsag.o 5 | 6 | clean: 7 | rm -f pocsag *.o 8 | -------------------------------------------------------------------------------- /src/pocsag.c: -------------------------------------------------------------------------------- 1 | /* Quick & Dirty POCSAG experiment */ 2 | 3 | /* (C) 2012 by Sylvain Munaut 4 | * All Rights Reserved 5 | * 6 | * This program is free software; you can redistribute it and/or modify 7 | * it under the terms of the GNU Affero General Public License as published by 8 | * the Free Software Foundation; either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * This program is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU Affero General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU Affero General Public License 17 | * along with this program. If not, see . 18 | * 19 | */ 20 | 21 | #include 22 | #include 23 | #include 24 | #include 25 | 26 | 27 | static int 28 | hamming_weight(uint32_t data) 29 | { 30 | int i, c=0; 31 | for (i=0; i<32 && data; i++) { 32 | c += data & 1; 33 | data >>= 1; 34 | } 35 | return c; 36 | } 37 | 38 | /* ------------------------------------------------------------------------ */ 39 | 40 | /* 41 | * the code used by POCSAG is a (n=31,k=21) BCH Code with dmin=5, 42 | * thus it could correct two bit errors in a 31-Bit codeword. 43 | * It is a systematic code. 44 | * The generator polynomial is: 45 | * g(x) = x^10+x^9+x^8+x^6+x^5+x^3+1 46 | * The parity check polynomial is: 47 | * h(x) = x^21+x^20+x^18+x^16+x^14+x^13+x^12+x^11+x^8+x^5+x^3+1 48 | * g(x) * h(x) = x^n+1 49 | */ 50 | 51 | #define BCH_POLY 0x769 52 | #define BCH_N 31 53 | #define BCH_K 21 54 | 55 | static inline uint8_t 56 | even_parity(uint32_t x) 57 | { 58 | x ^= x >> 16; 59 | x ^= x >> 8; 60 | x ^= x >> 4; 61 | x &= 0xf; 62 | return (0x6996 >> x) & 1; 63 | } 64 | 65 | static uint32_t 66 | bch_syndrome(uint32_t data) 67 | { 68 | uint32_t shreg = data >> 1; /* throw away parity bit */ 69 | uint32_t mask = 1L << (BCH_N-1), coeff = BCH_POLY << (BCH_K-1); 70 | int n = BCH_K; 71 | 72 | for(; n > 0; mask >>= 1, coeff >>= 1, n--) 73 | if (shreg & mask) 74 | shreg ^= coeff; 75 | 76 | if (even_parity(data)) 77 | shreg |= (1 << (BCH_N - BCH_K)); 78 | 79 | return shreg; 80 | } 81 | 82 | static uint32_t 83 | bch_fix(uint32_t data) 84 | { 85 | uint32_t t; 86 | int i, j; 87 | 88 | for (i=0; i<32; i++) { 89 | t = data ^ (1<bits = 0; 121 | pt->nb = 0; 122 | pt->nc = 0; 123 | memset(pt->buf, 0x00, POCSAG_TXT_LEN); 124 | } 125 | 126 | static void 127 | pocsag_txt_feed(struct pocsag_txt *pt, uint32_t d) 128 | { 129 | /* Add 20 bits */ 130 | pt->bits = (pt->bits << 20) | d; 131 | pt->nb += 20; 132 | 133 | /* Read as much char as possible */ 134 | while (pt->nb >= 7) { 135 | char c = (pt->bits >> (pt->nb - 7)) & 0x7f; 136 | pt->buf[pt->nc++] = 137 | ((c & 0x01) << 6) | 138 | ((c & 0x02) << 4) | 139 | ((c & 0x04) << 2) | 140 | (c & 0x08) | 141 | ((c & 0x10) >> 2) | 142 | ((c & 0x20) >> 4) | 143 | ((c & 0x40) >> 6); 144 | pt->nb -= 7; 145 | } 146 | } 147 | 148 | /* ------------------------------------------------------------------------ */ 149 | 150 | #define POCSAG_SYNC 0x7cd215d8 151 | #define POCSAG_IDLE 0x7a89c197 152 | 153 | #define SYNC_MAX 4 154 | #define SYNC_DEC 1 155 | #define SYNC_INC 2 156 | 157 | struct pocsag 158 | { 159 | int b; 160 | int sync; 161 | 162 | uint32_t cw; 163 | int cw_bits; 164 | int cw_num; 165 | 166 | int txt_active; 167 | struct pocsag_txt txt; 168 | }; 169 | 170 | static void 171 | pocsag_init(struct pocsag *ps) 172 | { 173 | memset(ps, 0x00, sizeof(struct pocsag)); 174 | pocsag_txt_init(&ps->txt); 175 | } 176 | 177 | static void 178 | pocsag_rx_bit(struct pocsag *ps, uint8_t bit) 179 | { 180 | uint32_t cw; 181 | uint32_t syndrome; 182 | 183 | /* One more bit */ 184 | ps->cw = (ps->cw << 1) | bit; 185 | ps->b++; 186 | 187 | /* Search for sync ? */ 188 | if (!ps->sync) { 189 | if (ps->cw != POCSAG_SYNC) 190 | return; 191 | 192 | printf("SYNC @%d\n", ps->b-1); 193 | 194 | ps->sync = SYNC_MAX; 195 | 196 | ps->cw = 0; 197 | ps->cw_bits = 0; 198 | ps->cw_num = 0; 199 | 200 | return; 201 | } 202 | 203 | /* CW boundary */ 204 | if (++ps->cw_bits != 32) 205 | return; 206 | 207 | ps->cw_bits = 0; 208 | 209 | /* Get / Check final CW */ 210 | cw = ps->cw; 211 | 212 | syndrome = bch_syndrome(cw); 213 | 214 | if (syndrome) { 215 | cw = bch_fix(ps->cw); 216 | syndrome = bch_syndrome(cw); 217 | } 218 | 219 | /* SYNC tracking */ 220 | if (syndrome) { 221 | ps->sync -= SYNC_DEC; 222 | if (ps->sync <= 0) { 223 | ps->sync = 0; 224 | printf(" \n"); 225 | return; 226 | } 227 | } else { 228 | ps->sync += SYNC_INC; 229 | if (ps->sync > SYNC_MAX) 230 | ps->sync = SYNC_MAX; 231 | } 232 | 233 | /* Debug output */ 234 | printf("%2d %08x (%08x) %d %2s", 235 | ps->cw_num, cw, ps->cw, hamming_weight(cw ^ ps->cw), 236 | syndrome == 0 ? "OK" : " " 237 | ); 238 | 239 | if (ps->cw_num == -1) { 240 | if (cw == POCSAG_SYNC) 241 | printf(" => SYNC\n"); 242 | ps->cw_num++; 243 | return; 244 | } 245 | 246 | if (cw == POCSAG_IDLE) { 247 | printf(" => IDLE"); 248 | if (!syndrome) { 249 | ps->txt_active = 0; 250 | } 251 | } else if (cw == POCSAG_SYNC) 252 | printf(" => SYNC"); 253 | else if (cw & (1<<31)) 254 | { 255 | static uint32_t ld; 256 | char *tbl = "0123456789*U -)("; 257 | uint32_t d = (cw >> 11) & 0xfffff; 258 | int i; 259 | printf(" __ "); 260 | 261 | for (i=0; i<5; i++) { 262 | printf("%c", tbl[(d >> ((4-i)*4)) & 0xf]); 263 | } 264 | 265 | #if 0 266 | if (cw_num & 1) { 267 | uint64_t fd = (ld << 20) | d; 268 | 269 | printf(" "); 270 | 271 | for (i=0; i<5; i++) { 272 | printf("%c", tbl[(d >> (i*5)) & 0xf]); 273 | } 274 | 275 | } else { 276 | ld = d; 277 | } 278 | #endif 279 | if (ps->txt_active) { 280 | pocsag_txt_feed(&ps->txt, d); 281 | printf(" - %d %d TXT: |%s|", ps->txt.nb, ps->txt.nc, ps->txt.buf); 282 | } 283 | } 284 | else 285 | { 286 | printf(" => Addr: %d", (cw >> 11) & 3); 287 | 288 | if (!syndrome) { 289 | pocsag_txt_init(&ps->txt); 290 | ps->txt_active = 1; 291 | } else if (ps->txt_active) { 292 | uint32_t d = (cw >> 11) & 0xfffff; 293 | pocsag_txt_feed(&ps->txt, d); 294 | } 295 | } 296 | 297 | printf("\n"); 298 | 299 | ps->cw_num ++; 300 | if (ps->cw_num == 16) 301 | ps->cw_num = -1; 302 | } 303 | 304 | int main(int argc, char *argv[]) 305 | { 306 | struct pocsag _ps, *ps=&_ps; 307 | FILE *f; 308 | 309 | if (argc != 2) { 310 | fprintf(stderr, "Usage: %s file.bits\n", argv[0]); 311 | return -1; 312 | } 313 | 314 | f = fopen(argv[1], "r"); 315 | if (!f) { 316 | fprintf(stderr, "[!] Unable to open input file\n"); 317 | return -1; 318 | } 319 | 320 | pocsag_init(ps); 321 | 322 | while (!feof(f)) 323 | { 324 | uint8_t c; 325 | if ( fread(&c, 1, 1, f) != 1 ) 326 | break; 327 | pocsag_rx_bit(ps, !c); 328 | } 329 | 330 | fclose(f); 331 | 332 | return 0; 333 | } 334 | --------------------------------------------------------------------------------