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c286431b9a
This is just a large conditional to check for the specific branches taken that would result in the null string. The path in CUPS is as follows: In cupsCopyDestInfo, CUPS_DEST_FLAG_DEVICE is set when the connection is not null (same as CUPS_HTTP_DEFAULT), the print server is not the same as our hostname and is not path-based (starts with a '/'), or the IPP port is different than the global server IPP port.c9da6f63b2/cups/dest-options.c (L718-L722)In _cupsGetDestResource, CUPS fetches the IPP options "printer-uri-supported" and "device-uri". Importantly, IPP options are returned as null when missing.23c45db76a/cups/dest.c (L1138-L1141)If the CUPS_DEST_FLAG_DEVICE is set or the "printer-uri-supported" option is not set, CUPS checks for "._tcp" in the "device-uri" option without doing a NULL-check first.23c45db76a/cups/dest.c (L1144)If we find that those branches will be taken, don't actually fetch the CUPS data and instead just return an empty printer info. Differential Revision: https://phabricator.services.mozilla.com/D128529
96 lines
3.2 KiB
C++
96 lines
3.2 KiB
C++
/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ex: set tabstop=8 softtabstop=2 shiftwidth=2 expandtab: */
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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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#ifndef nsCUPSShim_h___
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#define nsCUPSShim_h___
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#include <cups/cups.h>
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#include "mozilla/Atomics.h"
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#include "mozilla/Mutex.h"
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// TODO: This should be a configure option, ideally.
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#ifndef XP_MACOSX
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# define CUPS_SHIM_RUNTIME_LINK
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#endif
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struct PRLibrary;
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class nsCUPSShim {
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public:
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#ifdef CUPS_SHIM_RUNTIME_LINK
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nsCUPSShim();
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bool InitOkay() { return mInitOkay; }
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#else
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nsCUPSShim() = default;
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bool InitOkay() { return true; }
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#endif
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// We allow some functions to be missing, to degrade as gracefully as possible
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// for older versions of CUPS.
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//
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// The current target is CUPS 1.6 (bug 1701019).
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enum class Optional : bool { No, Yes };
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/**
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* Function pointers for supported functions. These are only
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* valid after successful initialization.
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*/
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#define CUPS_SHIM_ALL_FUNCS(X) \
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X(Optional::No, cupsAddOption) \
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X(Optional::No, cupsCheckDestSupported) \
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X(Optional::No, cupsConnectDest) \
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X(Optional::No, cupsCopyDest) \
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X(Optional::No, cupsCopyDestInfo) \
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X(Optional::No, cupsDoRequest) \
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X(Optional::No, cupsEnumDests) \
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X(Optional::No, cupsFreeDestInfo) \
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X(Optional::No, cupsFreeDests) \
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X(Optional::No, cupsGetDestMediaByName) \
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X(Optional::Yes, cupsFindDestDefault) \
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X(Optional::Yes, cupsGetDestMediaDefault) \
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X(Optional::Yes, cupsGetDestMediaCount) \
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X(Optional::Yes, cupsGetDestMediaByIndex) \
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X(Optional::Yes, cupsLocalizeDestMedia) \
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X(Optional::No, cupsGetDest) \
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X(Optional::No, cupsGetDests) \
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X(Optional::No, cupsGetNamedDest) \
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X(Optional::No, cupsGetOption) \
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X(Optional::No, cupsServer) \
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X(Optional::Yes, httpAddrPort) \
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X(Optional::No, httpClose) \
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X(Optional::No, httpGetHostname) \
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X(Optional::Yes, httpGetAddress) \
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X(Optional::No, ippAddString) \
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X(Optional::No, ippAddStrings) \
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X(Optional::No, ippDelete) \
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X(Optional::No, ippFindAttribute) \
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X(Optional::No, ippGetCount) \
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X(Optional::No, ippGetString) \
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X(Optional::No, ippNewRequest) \
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X(Optional::No, ippPort)
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#ifdef CUPS_SHIM_RUNTIME_LINK
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// Define a single field which holds a function pointer.
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# define CUPS_SHIM_FUNC_DECL(opt_, fn_) decltype(::fn_)* fn_ = nullptr;
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#else
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// Define a static constexpr function pointer. GCC can sometimes optimize
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// away the pointer fetch for this.
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# define CUPS_SHIM_FUNC_DECL(opt_, fn_) \
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static constexpr decltype(::fn_)* const fn_ = ::fn_;
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#endif
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CUPS_SHIM_ALL_FUNCS(CUPS_SHIM_FUNC_DECL)
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#undef CUPS_SHIM_FUNC_DECL
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#ifdef CUPS_SHIM_RUNTIME_LINK
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private:
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bool mInitOkay = false;
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PRLibrary* mCupsLib = nullptr;
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#endif
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};
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#endif /* nsCUPSShim_h___ */
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