123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
/*
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* s3fs - FUSE-based file system backed by Amazon S3
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*
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* Copyright(C) 2007 Randy Rizun <rrizun@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include "s3fs_logger.h"
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#include "bodydata.h"
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//-------------------------------------------------------------------
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// Variables
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//-------------------------------------------------------------------
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static const int BODYDATA_RESIZE_APPEND_MIN = 1024;
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static const int BODYDATA_RESIZE_APPEND_MID = 1024 * 1024;
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static const int BODYDATA_RESIZE_APPEND_MAX = 10 * 1024 * 1024;
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//-------------------------------------------------------------------
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// Utility Functions
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//-------------------------------------------------------------------
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static size_t adjust_block(size_t bytes, size_t block)
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{
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return ((bytes / block) + ((bytes % block) ? 1 : 0)) * block;
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}
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//-------------------------------------------------------------------
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// Class BodyData
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//-------------------------------------------------------------------
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bool BodyData::Resize(size_t addbytes)
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{
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if(IsSafeSize(addbytes)){
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return true;
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}
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// New size
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size_t need_size = adjust_block((lastpos + addbytes + 1) - bufsize, sizeof(off_t));
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if(BODYDATA_RESIZE_APPEND_MAX < bufsize){
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need_size = (BODYDATA_RESIZE_APPEND_MAX < need_size ? need_size : BODYDATA_RESIZE_APPEND_MAX);
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}else if(BODYDATA_RESIZE_APPEND_MID < bufsize){
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need_size = (BODYDATA_RESIZE_APPEND_MID < need_size ? need_size : BODYDATA_RESIZE_APPEND_MID);
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}else if(BODYDATA_RESIZE_APPEND_MIN < bufsize){
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need_size = ((bufsize * 2) < need_size ? need_size : (bufsize * 2));
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}else{
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need_size = (BODYDATA_RESIZE_APPEND_MIN < need_size ? need_size : BODYDATA_RESIZE_APPEND_MIN);
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}
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// realloc
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char* newtext;
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if(nullptr == (newtext = reinterpret_cast<char*>(realloc(text, (bufsize + need_size))))){
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S3FS_PRN_CRIT("not enough memory (realloc returned nullptr)");
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free(text);
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text = nullptr;
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return false;
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}
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text = newtext;
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bufsize += need_size;
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return true;
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}
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void BodyData::Clear()
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{
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if(text){
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free(text);
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text = nullptr;
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}
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lastpos = 0;
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bufsize = 0;
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}
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bool BodyData::Append(void* ptr, size_t bytes)
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{
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if(!ptr){
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return false;
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}
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if(0 == bytes){
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return true;
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}
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if(!Resize(bytes)){
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return false;
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}
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memcpy(&text[lastpos], ptr, bytes);
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lastpos += bytes;
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text[lastpos] = '\0';
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return true;
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}
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const char* BodyData::str() const
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{
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if(!text){
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static const char strnull[] = "";
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return strnull;
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}
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return text;
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: expandtab sw=4 ts=4 fdm=marker
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* vim<600: expandtab sw=4 ts=4
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*/
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