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File: [Pegasus] / pegasus / src / Pegasus / Common / Buffer.cpp
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Revision: 1.12, Tue Feb 13 19:21:44 2007 UTC (17 years, 4 months ago) by kumpf Branch: MAIN CVS Tags: TASK-PEP305_VXWORKS-root, TASK-PEP305_VXWORKS-branch-pre-solaris-port, TASK-PEP305_VXWORKS-branch-post-solaris-port, TASK-PEP305_VXWORKS-branch-beta2, TASK-PEP305_VXWORKS-branch, TASK-PEP305_VXWORKS-2008-10-23, TASK-PEP291_IPV6-root, TASK-PEP291_IPV6-branch, TASK-PEP286_PRIVILEGE_SEPARATION-root, TASK-PEP286_PRIVILEGE_SEPARATION-branch, TASK-PEP274_dacim-root, TASK-PEP274_dacim-merged_out_to_branch, TASK-PEP274_dacim-merged_out_from_trunk, TASK-PEP274_dacim-merged_in_to_trunk, TASK-PEP274_dacim-merged_in_from_branch, TASK-PEP274_dacim-branch, TASK-Bug2102_RCMPIWindows-root, TASK-Bug2102_RCMPIWindows-merged_out_to_branch, TASK-Bug2102_RCMPIWindows-merged_out_from_trunk, TASK-Bug2102_RCMPIWindows-merged_in_to_trunk, TASK-Bug2102_RCMPIWindows-merged_in_from_branch, TASK-Bug2102_RCMPIWindows-branch, TASK-Bug2102Final-root, TASK-Bug2102Final-merged_out_to_branch, TASK-Bug2102Final-merged_out_from_trunk, TASK-Bug2102Final-merged_in_to_trunk, TASK-Bug2102Final-merged_in_from_branch, TASK-Bug2102Final-branch, RELEASE_2_7_0-RC1, RELEASE_2_7_0-BETA, RELEASE_2_7_0, RELEASE_2_7-root Branch point for: RELEASE_2_7-branch Changes since 1.11: +11 -11 lines BUG#: 6098 TITLE: Use Uint32 instead of size_t in Buffer class DESCRIPTION: Use Uint32 in the Buffer interface to remove the need for explicit type conversions from size_t to Uint32. |
//%2006//////////////////////////////////////////////////////////////////////// // // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems. // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.; // IBM Corp.; EMC Corporation, The Open Group. // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.; // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group. // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.; // EMC Corporation; VERITAS Software Corporation; The Open Group. // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.; // EMC Corporation; Symantec Corporation; The Open Group. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to // deal in the Software without restriction, including without limitation the // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or // sell copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. // //============================================================================== // //%///////////////////////////////////////////////////////////////////////////// #include <cstring> #include "Buffer.h" #include "Pegasus/Common/InternalException.h" PEGASUS_NAMESPACE_BEGIN // // Note: _empty_rep is the only BufferRep object that may have a zero capacity. // So "_rep->cap == 0" implies "_rep == _empty_rep". But some platforms produce // more than one instance of _empty_rep (strangely). Therefore, it is safer to // use the former test rather than the latter. // BufferRep Buffer::_empty_rep = { 0, /* size */ 0, /* cap (zero implies it is the _empty_rep) */ {0} /* data[0] */ }; static const Uint32 MIN_CAPACITY = 2048; static Uint32 _next_pow_2(Uint32 x) { // Check for potential overflow in x. PEGASUS_CHECK_CAPACITY_OVERFLOW(x); if (x < MIN_CAPACITY) return MIN_CAPACITY; x--; x |= (x >> 1); x |= (x >> 2); x |= (x >> 4); x |= (x >> 8); x |= (x >> 16); x++; return x; } static inline BufferRep* _allocate(Uint32 cap) { if (cap < MIN_CAPACITY) cap = MIN_CAPACITY; // Allocate an extra byte for null-termination performed by getData(). BufferRep* rep = (BufferRep*)malloc(sizeof(BufferRep) + cap + 1); if (!rep) { throw PEGASUS_STD(bad_alloc)(); } rep->cap = cap; return rep; } static inline BufferRep* _reallocate(BufferRep* rep, Uint32 cap) { // Allocate an extra byte for null-termination performed by getData(). rep = (BufferRep*)realloc(rep, sizeof(BufferRep) + cap + 1); if (!rep) { throw PEGASUS_STD(bad_alloc)(); } rep->cap = cap; return rep; } Buffer::Buffer(const Buffer& x) { _rep = _allocate(x._rep->cap); memcpy(_rep->data, x._rep->data, x._rep->size); _rep->size = x._rep->size; } Buffer::Buffer(const char* data, Uint32 size) { _rep = _allocate(size); _rep->size = size; memcpy(_rep->data, data, size); } Buffer& Buffer::operator=(const Buffer& x) { if (&x != this) { if (x._rep->size > _rep->cap) { if (_rep->cap != 0) free(_rep); _rep = _allocate(x._rep->cap); } memcpy(_rep->data, x._rep->data, x._rep->size); _rep->size = x._rep->size; } return *this; } void Buffer::_reserve_aux(Uint32 cap) { if (_rep->cap == 0) { _rep = _allocate(cap); _rep->size = 0; } else _rep = _reallocate(_rep, _next_pow_2(cap)); } void Buffer::_append_char_aux() { if (_rep->cap == 0) { _rep = _allocate(MIN_CAPACITY); _rep->size = 0; } else { // Check for potential overflow. PEGASUS_CHECK_CAPACITY_OVERFLOW(_rep->cap); _rep = _reallocate(_rep, _rep->cap ? (2 * _rep->cap) : MIN_CAPACITY); } } void Buffer::insert(Uint32 pos, const char* data, Uint32 size) { if (pos > _rep->size) return; Uint32 cap = _rep->size + size; Uint32 rem = _rep->size - pos; if (cap > _rep->cap) { BufferRep* rep = _allocate(cap); rep->size = cap; memcpy(rep->data, _rep->data, pos); memcpy(rep->data + pos, data, size); memcpy(rep->data + pos + size, _rep->data + pos, rem); if (_rep->cap != 0) free(_rep); _rep = rep; } else { memmove(_rep->data + pos + size, _rep->data + pos, rem); memcpy(_rep->data + pos, data, size); _rep->size += size; } } void Buffer::remove(Uint32 pos, Uint32 size) { if (pos + size > _rep->size) return; Uint32 rem = _rep->size - (pos + size); if (rem) memmove(_rep->data + pos, _rep->data + pos + size, rem); _rep->size -= size; } PEGASUS_NAMESPACE_END
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