| 1 | /* $Id: string.cpp 52554 2014-09-01 16:00:05Z vboxsync $ */
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| 2 | /** @file
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| 3 | * MS COM / XPCOM Abstraction Layer - UTF-8 and UTF-16 string classes.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2012 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | #include "VBox/com/string.h"
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| 19 |
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| 20 | #include <iprt/err.h>
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| 21 | #include <iprt/path.h>
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| 22 | #include <iprt/log.h>
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| 23 |
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| 24 | namespace com
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| 25 | {
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| 26 |
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| 27 | // BSTR representing a null wide char with 32 bits of length prefix (0);
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| 28 | // this will work on Windows as well as other platforms where BSTR does
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| 29 | // not use length prefixes
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| 30 | const OLECHAR g_achEmptyBstr[3] = { 0, 0, 0 };
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| 31 | const BSTR g_bstrEmpty = (BSTR)&g_achEmptyBstr[2];
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| 32 |
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| 33 | /* static */
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| 34 | const Bstr Bstr::Empty; /* default ctor is OK */
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| 35 |
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| 36 | void Bstr::copyFromN(const char *a_pszSrc, size_t a_cchMax)
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| 37 | {
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| 38 | /*
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| 39 | * Initialie m_bstr first in case of throws further down in the code, then
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| 40 | * check for empty input (m_bstr == NULL means empty, there are no NULL
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| 41 | * strings).
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| 42 | */
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| 43 | m_bstr = NULL;
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| 44 | if (!a_cchMax || !a_pszSrc || !*a_pszSrc)
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| 45 | return;
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| 46 |
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| 47 | /*
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| 48 | * Calculate the length and allocate a BSTR string buffer of the right
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| 49 | * size, i.e. optimize heap usage.
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| 50 | */
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| 51 | size_t cwc;
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| 52 | int vrc = ::RTStrCalcUtf16LenEx(a_pszSrc, a_cchMax, &cwc);
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| 53 | if (RT_FAILURE(vrc))
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| 54 | {
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| 55 | /* ASSUME: input is valid Utf-8. Fake out of memory error. */
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| 56 | AssertLogRelMsgFailed(("%Rrc %.*Rhxs\n", vrc, RTStrNLen(a_pszSrc, a_cchMax), a_pszSrc));
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| 57 | throw std::bad_alloc();
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| 58 | }
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| 59 |
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| 60 | m_bstr = ::SysAllocStringByteLen(NULL, (unsigned)(cwc * sizeof(OLECHAR)));
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| 61 | if (RT_UNLIKELY(!m_bstr))
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| 62 | throw std::bad_alloc();
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| 63 |
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| 64 | PRTUTF16 pwsz = (PRTUTF16)m_bstr;
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| 65 | vrc = ::RTStrToUtf16Ex(a_pszSrc, a_cchMax, &pwsz, cwc + 1, NULL);
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| 66 | if (RT_FAILURE(vrc))
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| 67 | {
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| 68 | /* This should not happen! */
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| 69 | AssertRC(vrc);
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| 70 | cleanup();
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| 71 | throw std::bad_alloc();
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| 72 | }
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| 73 | }
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| 74 |
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| 75 |
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| 76 | /* static */
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| 77 | const Utf8Str Utf8Str::Empty; /* default ctor is OK */
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| 78 |
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| 79 | #if defined(VBOX_WITH_XPCOM)
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| 80 | void Utf8Str::cloneTo(char **pstr) const
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| 81 | {
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| 82 | size_t cb = length() + 1;
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| 83 | *pstr = (char*)nsMemory::Alloc(cb);
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| 84 | if (RT_UNLIKELY(!*pstr))
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| 85 | throw std::bad_alloc();
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| 86 | memcpy(*pstr, c_str(), cb);
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| 87 | }
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| 88 |
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| 89 | HRESULT Utf8Str::cloneToEx(char **pstr) const
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| 90 | {
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| 91 | size_t cb = length() + 1;
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| 92 | *pstr = (char*)nsMemory::Alloc(cb);
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| 93 | if (RT_UNLIKELY(!*pstr))
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| 94 | return E_OUTOFMEMORY;
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| 95 | memcpy(*pstr, c_str(), cb);
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| 96 | return S_OK;
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| 97 | }
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| 98 | #endif
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| 99 |
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| 100 | Utf8Str& Utf8Str::stripTrailingSlash()
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| 101 | {
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| 102 | if (length())
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| 103 | {
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| 104 | ::RTPathStripTrailingSlash(m_psz);
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| 105 | jolt();
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| 106 | }
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| 107 | return *this;
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| 108 | }
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| 109 |
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| 110 | Utf8Str& Utf8Str::stripFilename()
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| 111 | {
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| 112 | if (length())
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| 113 | {
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| 114 | RTPathStripFilename(m_psz);
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| 115 | jolt();
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| 116 | }
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| 117 | return *this;
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| 118 | }
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| 119 |
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| 120 | Utf8Str& Utf8Str::stripPath()
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| 121 | {
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| 122 | if (length())
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| 123 | {
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| 124 | char *pszName = ::RTPathFilename(m_psz);
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| 125 | if (pszName)
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| 126 | {
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| 127 | size_t cchName = length() - (pszName - m_psz);
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| 128 | memmove(m_psz, pszName, cchName + 1);
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| 129 | jolt();
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| 130 | }
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| 131 | else
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| 132 | cleanup();
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| 133 | }
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| 134 | return *this;
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| 135 | }
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| 136 |
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| 137 | Utf8Str& Utf8Str::stripSuffix()
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| 138 | {
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| 139 | if (length())
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| 140 | {
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| 141 | RTPathStripSuffix(m_psz);
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| 142 | jolt();
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| 143 | }
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| 144 | return *this;
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| 145 | }
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| 146 |
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| 147 | size_t Utf8Str::parseKeyValue(Utf8Str &key, Utf8Str &value, size_t pos, const Utf8Str &pairSeparator, const Utf8Str &keyValueSeparator) const
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| 148 | {
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| 149 | size_t start = pos;
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| 150 | while(start == (pos = find(pairSeparator.c_str(), pos)))
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| 151 | start = ++pos;
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| 152 |
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| 153 | size_t kvSepPos = find(keyValueSeparator.c_str(), start);
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| 154 | if (kvSepPos < pos)
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| 155 | {
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| 156 | key = substr(start, kvSepPos - start);
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| 157 | value = substr(kvSepPos + 1, pos - kvSepPos - 1);
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| 158 | }
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| 159 | else
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| 160 | {
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| 161 | key = value = "";
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| 162 | }
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| 163 | return pos;
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| 164 | }
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| 165 |
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| 166 | /**
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| 167 | * Internal function used in Utf8Str copy constructors and assignment when
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| 168 | * copying from a UTF-16 string.
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| 169 | *
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| 170 | * As with the RTCString::copyFrom() variants, this unconditionally sets the
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| 171 | * members to a copy of the given other strings and makes no assumptions about
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| 172 | * previous contents. This can therefore be used both in copy constructors,
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| 173 | * when member variables have no defined value, and in assignments after having
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| 174 | * called cleanup().
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| 175 | *
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| 176 | * This variant converts from a UTF-16 string, most probably from
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| 177 | * a Bstr assignment.
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| 178 | *
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| 179 | * @param a_pbstr The source string. The caller guarantees that this
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| 180 | * is valid UTF-16.
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| 181 | * @param a_cwcMax The number of characters to be copied. If set to RTSTR_MAX,
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| 182 | * the entire string will be copied.
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| 183 | *
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| 184 | * @sa RTCString::copyFromN
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| 185 | */
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| 186 | void Utf8Str::copyFrom(CBSTR a_pbstr, size_t a_cwcMax)
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| 187 | {
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| 188 | if (a_pbstr && *a_pbstr)
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| 189 | {
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| 190 | int vrc = RTUtf16ToUtf8Ex((PCRTUTF16)a_pbstr,
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| 191 | a_cwcMax, // size_t cwcString: translate entire string
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| 192 | &m_psz, // char **ppsz: output buffer
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| 193 | 0, // size_t cch: if 0, func allocates buffer in *ppsz
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| 194 | &m_cch); // size_t *pcch: receives the size of the output string, excluding the terminator.
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| 195 | if (RT_SUCCESS(vrc))
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| 196 | m_cbAllocated = m_cch + 1;
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| 197 | else
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| 198 | {
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| 199 | if ( vrc != VERR_NO_STR_MEMORY
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| 200 | && vrc != VERR_NO_MEMORY)
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| 201 | {
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| 202 | /* ASSUME: input is valid Utf-16. Fake out of memory error. */
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| 203 | AssertLogRelMsgFailed(("%Rrc %.*Rhxs\n", vrc, RTUtf16Len(a_pbstr) * sizeof(RTUTF16), a_pbstr));
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| 204 | }
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| 205 |
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| 206 | m_cch = 0;
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| 207 | m_cbAllocated = 0;
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| 208 | m_psz = NULL;
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| 209 |
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| 210 | throw std::bad_alloc();
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| 211 | }
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| 212 | }
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| 213 | else
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| 214 | {
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| 215 | m_cch = 0;
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| 216 | m_cbAllocated = 0;
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| 217 | m_psz = NULL;
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| 218 | }
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| 219 | }
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| 220 |
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| 221 | /**
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| 222 | * A variant of Utf8Str::copyFrom that does not throw any exceptions but returns
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| 223 | * E_OUTOFMEMORY instead.
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| 224 | *
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| 225 | * @param a_pbstr The source string.
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| 226 | * @returns S_OK or E_OUTOFMEMORY.
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| 227 | */
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| 228 | HRESULT Utf8Str::copyFromEx(CBSTR a_pbstr)
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| 229 | {
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| 230 | if (a_pbstr && *a_pbstr)
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| 231 | {
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| 232 | int vrc = RTUtf16ToUtf8Ex((PCRTUTF16)a_pbstr,
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| 233 | RTSTR_MAX, // size_t cwcString: translate entire string
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| 234 | &m_psz, // char **ppsz: output buffer
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| 235 | 0, // size_t cch: if 0, func allocates buffer in *ppsz
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| 236 | &m_cch); // size_t *pcch: receives the size of the output string, excluding the terminator.
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| 237 | if (RT_SUCCESS(vrc))
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| 238 | m_cbAllocated = m_cch + 1;
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| 239 | else
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| 240 | {
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| 241 | if ( vrc != VERR_NO_STR_MEMORY
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| 242 | && vrc != VERR_NO_MEMORY)
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| 243 | {
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| 244 | /* ASSUME: input is valid Utf-16. Fake out of memory error. */
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| 245 | AssertLogRelMsgFailed(("%Rrc %.*Rhxs\n", vrc, RTUtf16Len(a_pbstr) * sizeof(RTUTF16), a_pbstr));
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| 246 | }
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| 247 |
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| 248 | m_cch = 0;
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| 249 | m_cbAllocated = 0;
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| 250 | m_psz = NULL;
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| 251 |
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| 252 | return E_OUTOFMEMORY;
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| 253 | }
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| 254 | }
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| 255 | else
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| 256 | {
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| 257 | m_cch = 0;
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| 258 | m_cbAllocated = 0;
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| 259 | m_psz = NULL;
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| 260 | }
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| 261 | return S_OK;
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| 262 | }
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| 263 |
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| 264 |
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| 265 | /**
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| 266 | * A variant of Utf8Str::copyFromN that does not throw any exceptions but
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| 267 | * returns E_OUTOFMEMORY instead.
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| 268 | *
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| 269 | * @param a_pcszSrc The source string.
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| 270 | * @param a_offSrc Start offset to copy from.
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| 271 | * @param a_cchSrc The source string.
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| 272 | * @returns S_OK or E_OUTOFMEMORY.
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| 273 | *
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| 274 | * @remarks This calls cleanup() first, so the caller doesn't have to. (Saves
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| 275 | * code space.)
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| 276 | */
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| 277 | HRESULT Utf8Str::copyFromExNComRC(const char *a_pcszSrc, size_t a_offSrc, size_t a_cchSrc)
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| 278 | {
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| 279 | cleanup();
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| 280 | if (a_cchSrc)
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| 281 | {
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| 282 | m_psz = RTStrAlloc(a_cchSrc + 1);
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| 283 | if (RT_LIKELY(m_psz))
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| 284 | {
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| 285 | m_cch = a_cchSrc;
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| 286 | m_cbAllocated = a_cchSrc + 1;
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| 287 | memcpy(m_psz, a_pcszSrc + a_offSrc, a_cchSrc);
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| 288 | m_psz[a_cchSrc] = '\0';
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| 289 | }
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| 290 | else
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| 291 | {
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| 292 | m_cch = 0;
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| 293 | m_cbAllocated = 0;
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| 294 | return E_OUTOFMEMORY;
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| 295 | }
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| 296 | }
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| 297 | else
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| 298 | {
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| 299 | m_cch = 0;
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| 300 | m_cbAllocated = 0;
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| 301 | m_psz = NULL;
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| 302 | }
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| 303 | return S_OK;
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| 304 | }
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| 305 |
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| 306 | } /* namespace com */
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