/* $Id: string.cpp $ */ /** @file * MS COM / XPCOM Abstraction Layer - UTF-8 and UTF-16 string classes. */ /* * Copyright (C) 2006-2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ #include "VBox/com/string.h" #include #include #include #include #include namespace com { // BSTR representing a null wide char with 32 bits of length prefix (0); // this will work on Windows as well as other platforms where BSTR does // not use length prefixes const OLECHAR g_achEmptyBstr[3] = { 0, 0, 0 }; const BSTR g_bstrEmpty = (BSTR)&g_achEmptyBstr[2]; /* static */ const Bstr Bstr::Empty; /* default ctor is OK */ Bstr &Bstr::printf(const char *pszFormat, ...) { va_list va; va_start(va, pszFormat); HRESULT hrc = printfVNoThrow(pszFormat, va); va_end(va); if (hrc == S_OK) { /* likely */ } else throw std::bad_alloc(); return *this; } HRESULT Bstr::printfNoThrow(const char *pszFormat, ...) RT_NOEXCEPT { va_list va; va_start(va, pszFormat); HRESULT hrc = printfVNoThrow(pszFormat, va); va_end(va); return hrc; } Bstr &Bstr::printfV(const char *pszFormat, va_list va) { HRESULT hrc = printfVNoThrow(pszFormat, va); if (hrc == S_OK) { /* likely */ } else throw std::bad_alloc(); return *this; } struct BSTRNOTHROW { Bstr *pThis; size_t cwcAlloc; size_t offDst; HRESULT hrc; }; /** * Callback used with RTStrFormatV by Bstr::printfVNoThrow. * * @returns The number of bytes added (not used). * * @param pvArg Pointer to a BSTRNOTHROW structure. * @param pachChars The characters to append. * @param cbChars The number of characters. 0 on the final callback. */ /*static*/ DECLCALLBACK(size_t) Bstr::printfOutputCallbackNoThrow(void *pvArg, const char *pachChars, size_t cbChars) RT_NOEXCEPT { BSTRNOTHROW *pArgs = (BSTRNOTHROW *)pvArg; if (cbChars) { size_t cwcAppend; int rc = ::RTStrCalcUtf16LenEx(pachChars, cbChars, &cwcAppend); AssertRCReturnStmt(rc, pArgs->hrc = E_UNEXPECTED, 0); /* * Ensure we've got sufficient memory. */ Bstr *pThis = pArgs->pThis; size_t const cwcBoth = pArgs->offDst + cwcAppend; if (cwcBoth >= pArgs->cwcAlloc) { if (pArgs->hrc == S_OK) { /* Double the buffer size, if it's less that _1M. Align sizes like for append. */ size_t cwcAlloc = RT_ALIGN_Z(pArgs->cwcAlloc, 128); cwcAlloc += RT_MIN(cwcAlloc, _1M); if (cwcAlloc <= cwcBoth) cwcAlloc = RT_ALIGN_Z(cwcBoth + 1, 512); pArgs->hrc = pThis->reserveNoThrow(cwcAlloc, true /*fForce*/); AssertMsgReturn(pArgs->hrc == S_OK, ("cwcAlloc=%#zx\n", cwcAlloc), 0); pArgs->cwcAlloc = cwcAlloc; } else return 0; } /* * Do the conversion. */ PRTUTF16 pwszDst = pThis->m_bstr + pArgs->offDst; Assert(pArgs->cwcAlloc > pArgs->offDst); rc = ::RTStrToUtf16Ex(pachChars, cbChars, &pwszDst, pArgs->cwcAlloc - pArgs->offDst, &cwcAppend); AssertRCReturnStmt(rc, pArgs->hrc = E_UNEXPECTED, 0); pArgs->offDst += cwcAppend; } return cbChars; } HRESULT Bstr::printfVNoThrow(const char *pszFormat, va_list va) RT_NOEXCEPT { cleanup(); BSTRNOTHROW Args = { this, 0, 0, S_OK }; RTStrFormatV(printfOutputCallbackNoThrow, &Args, NULL, NULL, pszFormat, va); if (Args.hrc == S_OK) { Args.hrc = joltNoThrow(Args.offDst); if (Args.hrc == S_OK) return S_OK; } cleanup(); return Args.hrc; } void Bstr::copyFromN(const char *a_pszSrc, size_t a_cchMax) { /* * Initialize m_bstr first in case of throws further down in the code, then * check for empty input (m_bstr == NULL means empty, there are no NULL * strings). */ m_bstr = NULL; if (!a_cchMax || !a_pszSrc || !*a_pszSrc) return; /* * Calculate the length and allocate a BSTR string buffer of the right * size, i.e. optimize heap usage. */ size_t cwc; int vrc = ::RTStrCalcUtf16LenEx(a_pszSrc, a_cchMax, &cwc); if (RT_SUCCESS(vrc)) { m_bstr = ::SysAllocStringByteLen(NULL, (unsigned)(cwc * sizeof(OLECHAR))); if (RT_LIKELY(m_bstr)) { PRTUTF16 pwsz = (PRTUTF16)m_bstr; vrc = ::RTStrToUtf16Ex(a_pszSrc, a_cchMax, &pwsz, cwc + 1, NULL); if (RT_SUCCESS(vrc)) return; /* This should not happen! */ AssertRC(vrc); cleanup(); } } else /* ASSUME: input is valid Utf-8. Fake out of memory error. */ AssertLogRelMsgFailed(("%Rrc %.*Rhxs\n", vrc, RTStrNLen(a_pszSrc, a_cchMax), a_pszSrc)); throw std::bad_alloc(); } int Bstr::compareUtf8(const char *a_pszRight, CaseSensitivity a_enmCase /*= CaseSensitive*/) const { PCRTUTF16 pwszLeft = m_bstr; /* * Special case for null/empty strings. Unlike RTUtf16Cmp we * treat null and empty equally. */ if (!pwszLeft) return !a_pszRight || *a_pszRight == '\0' ? 0 : -1; if (!a_pszRight) return *pwszLeft == '\0' ? 0 : 1; /* * Compare with a UTF-8 string by enumerating them char by char. */ for (;;) { RTUNICP ucLeft; int rc = RTUtf16GetCpEx(&pwszLeft, &ucLeft); AssertRCReturn(rc, 1); RTUNICP ucRight; rc = RTStrGetCpEx(&a_pszRight, &ucRight); AssertRCReturn(rc, -1); if (ucLeft == ucRight) { if (ucLeft) continue; return 0; } if (a_enmCase == CaseInsensitive) { if (RTUniCpToUpper(ucLeft) == RTUniCpToUpper(ucRight)) continue; if (RTUniCpToLower(ucLeft) == RTUniCpToLower(ucRight)) continue; } return ucLeft < ucRight ? -1 : 1; } } #ifndef VBOX_WITH_XPCOM HRESULT Bstr::joltNoThrow(ssize_t cwcNew /* = -1*/) { if (m_bstr) { size_t const cwcAlloc = ::SysStringLen(m_bstr); size_t const cwcActual = cwcNew < 0 ? ::RTUtf16Len(m_bstr) : (size_t)cwcNew; Assert(cwcNew < 0 || cwcActual == ::RTUtf16Len(m_bstr)); if (cwcActual != cwcAlloc) { Assert(cwcActual <= cwcAlloc); Assert((unsigned int)cwcActual == cwcActual); /* Official way: Reallocate the string. We could of course just update the size-prefix if we dared... */ if (!::SysReAllocStringLen(&m_bstr, NULL, (unsigned int)cwcActual)) { AssertFailed(); return E_OUTOFMEMORY; } } } else Assert(cwcNew <= 0); return S_OK; } void Bstr::jolt(ssize_t cwcNew /* = -1*/) { HRESULT hrc = joltNoThrow(cwcNew); if (hrc != S_OK) throw std::bad_alloc(); } #endif /* !VBOX_WITH_XPCOM */ HRESULT Bstr::reserveNoThrow(size_t cwcMin, bool fForce /*= false*/) RT_NOEXCEPT { /* If not forcing the string to the cwcMin length, check cwcMin against the current string length: */ if (!fForce) { size_t cwcCur = m_bstr ? ::SysStringLen(m_bstr) : 0; if (cwcCur >= cwcMin) return S_OK; } /* The documentation for SysReAllocStringLen hints about it being allergic to NULL in some way or another, so we call SysAllocStringLen directly when appropriate: */ if (m_bstr) AssertReturn(::SysReAllocStringLen(&m_bstr, NULL, (unsigned int)cwcMin) != FALSE, E_OUTOFMEMORY); else if (cwcMin > 0) { m_bstr = ::SysAllocStringLen(NULL, (unsigned int)cwcMin); AssertReturn(m_bstr, E_OUTOFMEMORY); } return S_OK; } void Bstr::reserve(size_t cwcMin, bool fForce /*= false*/) { HRESULT hrc = reserveNoThrow(cwcMin, fForce); if (hrc != S_OK) throw std::bad_alloc(); } Bstr &Bstr::append(const Bstr &rThat) { if (rThat.isNotEmpty()) return appendWorkerUtf16(rThat.m_bstr, rThat.length()); return *this; } HRESULT Bstr::appendNoThrow(const Bstr &rThat) RT_NOEXCEPT { if (rThat.isNotEmpty()) return appendWorkerUtf16NoThrow(rThat.m_bstr, rThat.length()); return S_OK; } Bstr &Bstr::append(const RTCString &rThat) { if (rThat.isNotEmpty()) return appendWorkerUtf8(rThat.c_str(), rThat.length()); return *this; } HRESULT Bstr::appendNoThrow(const RTCString &rThat) RT_NOEXCEPT { if (rThat.isNotEmpty()) return appendWorkerUtf8NoThrow(rThat.c_str(), rThat.length()); return S_OK; } Bstr &Bstr::append(CBSTR pwszSrc) { if (pwszSrc && *pwszSrc) return appendWorkerUtf16(pwszSrc, RTUtf16Len(pwszSrc)); return *this; } HRESULT Bstr::appendNoThrow(CBSTR pwszSrc) RT_NOEXCEPT { if (pwszSrc && *pwszSrc) return appendWorkerUtf16NoThrow(pwszSrc, RTUtf16Len(pwszSrc)); return S_OK; } Bstr &Bstr::append(const char *pszSrc) { if (pszSrc && *pszSrc) return appendWorkerUtf8(pszSrc, strlen(pszSrc)); return *this; } HRESULT Bstr::appendNoThrow(const char *pszSrc) RT_NOEXCEPT { if (pszSrc && *pszSrc) return appendWorkerUtf8NoThrow(pszSrc, strlen(pszSrc)); return S_OK; } Bstr &Bstr::append(const Bstr &rThat, size_t offStart, size_t cwcMax /*= RTSTR_MAX*/) { size_t cwcSrc = rThat.length(); if (offStart < cwcSrc) return appendWorkerUtf16(rThat.raw() + offStart, RT_MIN(cwcSrc - offStart, cwcMax)); return *this; } HRESULT Bstr::appendNoThrow(const Bstr &rThat, size_t offStart, size_t cwcMax /*= RTSTR_MAX*/) RT_NOEXCEPT { size_t cwcSrc = rThat.length(); if (offStart < cwcSrc) return appendWorkerUtf16NoThrow(rThat.raw() + offStart, RT_MIN(cwcSrc - offStart, cwcMax)); return S_OK; } Bstr &Bstr::append(const RTCString &rThat, size_t offStart, size_t cchMax /*= RTSTR_MAX*/) { if (offStart < rThat.length()) return appendWorkerUtf8(rThat.c_str() + offStart, RT_MIN(rThat.length() - offStart, cchMax)); return *this; } HRESULT Bstr::appendNoThrow(const RTCString &rThat, size_t offStart, size_t cchMax /*= RTSTR_MAX*/) RT_NOEXCEPT { if (offStart < rThat.length()) return appendWorkerUtf8NoThrow(rThat.c_str() + offStart, RT_MIN(rThat.length() - offStart, cchMax)); return S_OK; } Bstr &Bstr::append(CBSTR pwszThat, size_t cchMax) { return appendWorkerUtf16(pwszThat, RTUtf16NLen(pwszThat, cchMax)); } HRESULT Bstr::appendNoThrow(CBSTR pwszThat, size_t cchMax) RT_NOEXCEPT { return appendWorkerUtf16NoThrow(pwszThat, RTUtf16NLen(pwszThat, cchMax)); } Bstr &Bstr::append(const char *pszThat, size_t cchMax) { return appendWorkerUtf8(pszThat, RTStrNLen(pszThat, cchMax)); } HRESULT Bstr::appendNoThrow(const char *pszThat, size_t cchMax) RT_NOEXCEPT { return appendWorkerUtf8NoThrow(pszThat, RTStrNLen(pszThat, cchMax)); } Bstr &Bstr::append(char ch) { AssertMsg(ch > 0 && ch < 127, ("%#x\n", ch)); return appendWorkerUtf8(&ch, 1); } HRESULT Bstr::appendNoThrow(char ch) RT_NOEXCEPT { AssertMsg(ch > 0 && ch < 127, ("%#x\n", ch)); return appendWorkerUtf8NoThrow(&ch, 1); } Bstr &Bstr::appendCodePoint(RTUNICP uc) { RTUTF16 wszTmp[3]; PRTUTF16 pwszEnd = RTUtf16PutCp(wszTmp, uc); *pwszEnd = '\0'; return appendWorkerUtf16(&wszTmp[0], pwszEnd - &wszTmp[0]); } HRESULT Bstr::appendCodePointNoThrow(RTUNICP uc) RT_NOEXCEPT { RTUTF16 wszTmp[3]; PRTUTF16 pwszEnd = RTUtf16PutCp(wszTmp, uc); *pwszEnd = '\0'; return appendWorkerUtf16NoThrow(&wszTmp[0], pwszEnd - &wszTmp[0]); } Bstr &Bstr::appendWorkerUtf16(PCRTUTF16 pwszSrc, size_t cwcSrc) { size_t cwcOld = length(); size_t cwcTotal = cwcOld + cwcSrc; reserve(cwcTotal, true /*fForce*/); if (cwcSrc) memcpy(&m_bstr[cwcOld], pwszSrc, cwcSrc * sizeof(RTUTF16)); m_bstr[cwcTotal] = '\0'; return *this; } HRESULT Bstr::appendWorkerUtf16NoThrow(PCRTUTF16 pwszSrc, size_t cwcSrc) RT_NOEXCEPT { size_t cwcOld = length(); size_t cwcTotal = cwcOld + cwcSrc; HRESULT hrc = reserveNoThrow(cwcTotal, true /*fForce*/); if (hrc == S_OK) { if (cwcSrc) memcpy(&m_bstr[cwcOld], pwszSrc, cwcSrc * sizeof(RTUTF16)); m_bstr[cwcTotal] = '\0'; } return hrc; } Bstr &Bstr::appendWorkerUtf8(const char *pszSrc, size_t cchSrc) { size_t cwcSrc; int rc = RTStrCalcUtf16LenEx(pszSrc, cchSrc, &cwcSrc); AssertRCStmt(rc, throw std::bad_alloc()); size_t cwcOld = length(); size_t cwcTotal = cwcOld + cwcSrc; reserve(cwcTotal, true /*fForce*/); if (cwcSrc) { PRTUTF16 pwszDst = &m_bstr[cwcOld]; rc = RTStrToUtf16Ex(pszSrc, cchSrc, &pwszDst, cwcSrc + 1, NULL); AssertRCStmt(rc, throw std::bad_alloc()); } m_bstr[cwcTotal] = '\0'; return *this; } HRESULT Bstr::appendWorkerUtf8NoThrow(const char *pszSrc, size_t cchSrc) RT_NOEXCEPT { size_t cwcSrc; int rc = RTStrCalcUtf16LenEx(pszSrc, cchSrc, &cwcSrc); AssertRCStmt(rc, E_INVALIDARG); size_t cwcOld = length(); size_t cwcTotal = cwcOld + cwcSrc; HRESULT hrc = reserveNoThrow(cwcTotal, true /*fForce*/); AssertReturn(hrc == S_OK, hrc); if (cwcSrc) { PRTUTF16 pwszDst = &m_bstr[cwcOld]; rc = RTStrToUtf16Ex(pszSrc, cchSrc, &pwszDst, cwcSrc + 1, NULL); AssertRCStmt(rc, E_INVALIDARG); } m_bstr[cwcTotal] = '\0'; return S_OK; } Bstr &Bstr::appendPrintf(const char *pszFormat, ...) { va_list va; va_start(va, pszFormat); HRESULT hrc = appendPrintfVNoThrow(pszFormat, va); va_end(va); if (hrc != S_OK) throw std::bad_alloc(); return *this; } HRESULT Bstr::appendPrintfNoThrow(const char *pszFormat, ...) RT_NOEXCEPT { va_list va; va_start(va, pszFormat); HRESULT hrc = appendPrintfVNoThrow(pszFormat, va); va_end(va); return hrc; } Bstr &Bstr::appendPrintfV(const char *pszFormat, va_list va) { HRESULT hrc = appendPrintfVNoThrow(pszFormat, va); if (hrc != S_OK) throw std::bad_alloc(); return *this; } HRESULT Bstr::appendPrintfVNoThrow(const char *pszFormat, va_list va) RT_NOEXCEPT { size_t const cwcOld = length(); BSTRNOTHROW Args = { this, cwcOld, cwcOld, S_OK }; RTStrFormatV(printfOutputCallbackNoThrow, &Args, NULL, NULL, pszFormat, va); if (Args.hrc == S_OK) { Args.hrc = joltNoThrow(Args.offDst); if (Args.hrc == S_OK) return S_OK; } if (m_bstr) m_bstr[cwcOld] = '\0'; return Args.hrc; } Bstr &Bstr::erase(size_t offStart /*= 0*/, size_t cwcLength /*= RTSTR_MAX*/) RT_NOEXCEPT { size_t cwc = length(); if (offStart < cwc) { if (cwcLength >= cwc - offStart) { if (!offStart) cleanup(); else { /* Trail removal, nothing to move. */ m_bstr[offStart] = '\0'; joltNoThrow(offStart); /* not entirely optimal... */ } } else if (cwcLength > 0) { /* Pull up the tail to offStart. */ size_t cwcAfter = cwc - offStart - cwcLength; memmove(&m_bstr[offStart], &m_bstr[offStart + cwcLength], cwcAfter * sizeof(*m_bstr)); cwc -= cwcLength; m_bstr[cwc] = '\0'; joltNoThrow(cwc); /* not entirely optimal... */ } } return *this; } void Bstr::cleanup() { if (m_bstr) { ::SysFreeString(m_bstr); m_bstr = NULL; } } void Bstr::copyFrom(const OLECHAR *a_bstrSrc) { if (a_bstrSrc && *a_bstrSrc) { m_bstr = ::SysAllocString(a_bstrSrc); if (!m_bstr) throw std::bad_alloc(); } else m_bstr = NULL; } void Bstr::cleanupAndCopyFrom(const OLECHAR *a_bstrSrc) { cleanup(); copyFrom(a_bstrSrc); } /********************************************************************************************************************************* * Utf8Str Implementation * *********************************************************************************************************************************/ /* static */ const Utf8Str Utf8Str::Empty; /* default ctor is OK */ #if defined(VBOX_WITH_XPCOM) void Utf8Str::cloneTo(char **pstr) const { size_t cb = length() + 1; *pstr = (char *)nsMemory::Alloc(cb); if (RT_LIKELY(*pstr)) memcpy(*pstr, c_str(), cb); else throw std::bad_alloc(); } HRESULT Utf8Str::cloneToEx(char **pstr) const { size_t cb = length() + 1; *pstr = (char *)nsMemory::Alloc(cb); if (RT_LIKELY(*pstr)) { memcpy(*pstr, c_str(), cb); return S_OK; } return E_OUTOFMEMORY; } #endif Utf8Str& Utf8Str::stripTrailingSlash() { if (length()) { ::RTPathStripTrailingSlash(m_psz); jolt(); } return *this; } Utf8Str& Utf8Str::stripFilename() { if (length()) { RTPathStripFilename(m_psz); jolt(); } return *this; } Utf8Str& Utf8Str::stripPath() { if (length()) { char *pszName = ::RTPathFilename(m_psz); if (pszName) { size_t cchName = length() - (pszName - m_psz); memmove(m_psz, pszName, cchName + 1); jolt(); } else cleanup(); } return *this; } Utf8Str& Utf8Str::stripSuffix() { if (length()) { RTPathStripSuffix(m_psz); jolt(); } return *this; } size_t Utf8Str::parseKeyValue(Utf8Str &a_rKey, Utf8Str &a_rValue, size_t a_offStart /* = 0*/, const Utf8Str &a_rPairSeparator /*= ","*/, const Utf8Str &a_rKeyValueSeparator /*= "="*/) const { /* Find the end of the next pair, skipping empty pairs. Note! The skipping allows us to pass the return value of a parseKeyValue() call as offStart to the next call. */ size_t offEnd; while ( a_offStart == (offEnd = find(&a_rPairSeparator, a_offStart)) && offEnd != npos) a_offStart++; /* Look for a key/value separator before the end of the pair. ASSUMES npos value returned by find when the substring is not found is really high. */ size_t offKeyValueSep = find(&a_rKeyValueSeparator, a_offStart); if (offKeyValueSep < offEnd) { a_rKey = substr(a_offStart, offKeyValueSep - a_offStart); if (offEnd == npos) offEnd = m_cch; /* No confusing npos when returning strings. */ a_rValue = substr(offKeyValueSep + 1, offEnd - offKeyValueSep - 1); } else { a_rKey.setNull(); a_rValue.setNull(); } return offEnd; } /** * Internal function used in Utf8Str copy constructors and assignment when * copying from a UTF-16 string. * * As with the RTCString::copyFrom() variants, this unconditionally sets the * members to a copy of the given other strings and makes no assumptions about * previous contents. This can therefore be used both in copy constructors, * when member variables have no defined value, and in assignments after having * called cleanup(). * * This variant converts from a UTF-16 string, most probably from * a Bstr assignment. * * @param a_pbstr The source string. The caller guarantees that this * is valid UTF-16. * @param a_cwcMax The number of characters to be copied. If set to RTSTR_MAX, * the entire string will be copied. * * @sa RTCString::copyFromN */ void Utf8Str::copyFrom(CBSTR a_pbstr, size_t a_cwcMax) { if (a_pbstr && *a_pbstr) { int vrc = RTUtf16ToUtf8Ex((PCRTUTF16)a_pbstr, a_cwcMax, // size_t cwcString: translate entire string &m_psz, // char **ppsz: output buffer 0, // size_t cch: if 0, func allocates buffer in *ppsz &m_cch); // size_t *pcch: receives the size of the output string, excluding the terminator. if (RT_SUCCESS(vrc)) m_cbAllocated = m_cch + 1; else { if ( vrc != VERR_NO_STR_MEMORY && vrc != VERR_NO_MEMORY) { /* ASSUME: input is valid Utf-16. Fake out of memory error. */ AssertLogRelMsgFailed(("%Rrc %.*Rhxs\n", vrc, RTUtf16Len(a_pbstr) * sizeof(RTUTF16), a_pbstr)); } m_cch = 0; m_cbAllocated = 0; m_psz = NULL; throw std::bad_alloc(); } } else { m_cch = 0; m_cbAllocated = 0; m_psz = NULL; } } /** * A variant of Utf8Str::copyFrom that does not throw any exceptions but returns * E_OUTOFMEMORY instead. * * @param a_pbstr The source string. * @returns S_OK or E_OUTOFMEMORY. */ HRESULT Utf8Str::copyFromEx(CBSTR a_pbstr) { if (a_pbstr && *a_pbstr) { int vrc = RTUtf16ToUtf8Ex((PCRTUTF16)a_pbstr, RTSTR_MAX, // size_t cwcString: translate entire string &m_psz, // char **ppsz: output buffer 0, // size_t cch: if 0, func allocates buffer in *ppsz &m_cch); // size_t *pcch: receives the size of the output string, excluding the terminator. if (RT_SUCCESS(vrc)) m_cbAllocated = m_cch + 1; else { if ( vrc != VERR_NO_STR_MEMORY && vrc != VERR_NO_MEMORY) { /* ASSUME: input is valid Utf-16. Fake out of memory error. */ AssertLogRelMsgFailed(("%Rrc %.*Rhxs\n", vrc, RTUtf16Len(a_pbstr) * sizeof(RTUTF16), a_pbstr)); } m_cch = 0; m_cbAllocated = 0; m_psz = NULL; return E_OUTOFMEMORY; } } else { m_cch = 0; m_cbAllocated = 0; m_psz = NULL; } return S_OK; } /** * A variant of Utf8Str::copyFromN that does not throw any exceptions but * returns E_OUTOFMEMORY instead. * * @param a_pcszSrc The source string. * @param a_offSrc Start offset to copy from. * @param a_cchSrc How much to copy * @returns S_OK or E_OUTOFMEMORY. * * @remarks This calls cleanup() first, so the caller doesn't have to. (Saves * code space.) */ HRESULT Utf8Str::copyFromExNComRC(const char *a_pcszSrc, size_t a_offSrc, size_t a_cchSrc) { Assert(!a_cchSrc || !m_psz || (uintptr_t)&a_pcszSrc[a_offSrc] - (uintptr_t)m_psz >= (uintptr_t)m_cbAllocated); cleanup(); if (a_cchSrc) { m_psz = RTStrAlloc(a_cchSrc + 1); if (RT_LIKELY(m_psz)) { m_cch = a_cchSrc; m_cbAllocated = a_cchSrc + 1; memcpy(m_psz, a_pcszSrc + a_offSrc, a_cchSrc); m_psz[a_cchSrc] = '\0'; } else { m_cch = 0; m_cbAllocated = 0; return E_OUTOFMEMORY; } } else { m_cch = 0; m_cbAllocated = 0; m_psz = NULL; } return S_OK; } } /* namespace com */