author | jjkang |
Fri, 25 Jun 2010 19:56:45 +0800 | |
changeset 604 | b33dd54aaa52 |
parent 0 | 044383f39525 |
child 3 | e1eecf4d390d |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* Expanding text buffer |
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* |
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*/ |
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|
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|
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|
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|
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#include <malloc.h> |
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#include "buffer.h" |
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#include <string.h> |
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|
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/* efficient allocation unit: */ |
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#define ALLOCSIZE 4096 |
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#define INITIALBLOCKCOUNT 128 |
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|
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byteblock *buffer_newblock(buffer *b, unsigned int size) |
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{ |
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byteblock *bb; |
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if (!b) |
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return NULL; |
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|
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b->lastblock++; |
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|
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if (b->lastblock == b->maxblocks) |
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{ |
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byteblock **nbb = (byteblock **)realloc(b->blocks, sizeof(byteblock *) * (b->maxblocks + INITIALBLOCKCOUNT)); |
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if (!nbb) |
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return NULL; |
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|
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b->blocks = nbb; |
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b->maxblocks += INITIALBLOCKCOUNT; |
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} |
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|
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bb = malloc(sizeof(byteblock) + size-1); |
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|
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if (!bb) |
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{ |
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|
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return NULL; |
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} |
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|
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b->blocks[b->lastblock] = bb; |
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|
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bb->fill = 0; |
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bb->size = size; |
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|
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return bb; |
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} |
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|
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buffer *buffer_new(void) |
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{ |
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buffer *b = malloc(sizeof(buffer)); |
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|
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if (b) |
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{ |
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b->lastblock = -1; /* no blocks as yet */ |
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b->maxblocks = INITIALBLOCKCOUNT; |
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b->blocks = (byteblock **)malloc(sizeof(byteblock *) * b->maxblocks); |
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if (!b->blocks) |
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{ |
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free(b); |
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return NULL; |
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} |
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|
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buffer_newblock(b, ALLOCSIZE); |
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} |
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|
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return b; |
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} |
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|
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|
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char *buffer_append(buffer *b, char *bytes, unsigned int size) |
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{ |
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if (!b || !bytes) |
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return NULL; |
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|
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char *space = buffer_makespace(b, size); |
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if (!space) |
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return NULL; |
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memcpy(space, bytes, size); |
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buffer_usespace(b, size); |
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96 |
|
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return space; |
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} |
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|
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char *buffer_prepend(buffer *b, char *bytes, unsigned int size) |
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{ |
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byteblock *bb; |
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|
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if (!b || !bytes) |
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return NULL; |
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106 |
|
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bb = buffer_newblock(b, size); |
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/* cheat by moving the new block from the end to the start. */ |
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109 |
|
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bb = b->blocks[b->lastblock]; |
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if (b->lastblock != 0) |
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112 |
{ |
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memmove(b->blocks+1, b->blocks, sizeof(byteblock *) * b->lastblock ); |
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b->blocks[0] = bb; |
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115 |
} |
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116 |
|
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117 |
memcpy(&(b->blocks[0]->byte0), bytes, size); |
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118 |
|
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b->blocks[0]->fill = size; |
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120 |
|
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return &(b->blocks[0]->byte0); |
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} |
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123 |
|
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/* Allocate memory at the end of the buffer (if there isn't |
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125 |
* enough already) so that the user can append at least that |
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126 |
* many bytes without overrunning the buffer. This is useful |
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127 |
* where one may not know in advance how many bytes are to be |
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128 |
* added (e.g. reading from a socket) but one does know the |
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129 |
* upper limit. |
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*/ |
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char *buffer_makespace(buffer *b, unsigned int size) |
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132 |
{ |
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133 |
byteblock *bb; |
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134 |
byteblock *last; |
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if (!b) |
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return NULL; |
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137 |
|
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last = b->blocks[b->lastblock]; |
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139 |
|
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140 |
if (last->size - last->fill > size) |
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141 |
return (&last->byte0 + last->fill); |
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142 |
|
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143 |
if (size > ALLOCSIZE) |
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144 |
{ |
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bb = buffer_newblock(b, size); |
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146 |
} else { |
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bb = buffer_newblock(b, ALLOCSIZE); |
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148 |
} |
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149 |
|
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150 |
if (!bb) |
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151 |
return NULL; |
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152 |
|
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153 |
return &bb->byte0; |
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154 |
} |
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155 |
|
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156 |
void buffer_usespace(buffer *b, unsigned int nbytes) |
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157 |
{ |
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158 |
byteblock *last; |
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159 |
|
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160 |
if (!b) |
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161 |
return; |
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162 |
|
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163 |
last = b->blocks[b->lastblock]; |
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164 |
|
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165 |
if (last->fill + nbytes < last->size) |
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166 |
last->fill += nbytes; |
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167 |
else |
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168 |
last->fill = last->size; /* really an error - no exceptions though. */ |
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169 |
} |
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170 |
|
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171 |
byteblock *buffer_getbytes(buffer *b, int *iterator) |
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172 |
{ |
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173 |
if (!b) |
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174 |
return NULL; |
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175 |
|
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176 |
if (*iterator > b->lastblock) |
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177 |
return NULL; |
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|
178 |
|
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179 |
return b->blocks[(*iterator)++]; |
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180 |
} |
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|
181 |
|
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182 |
void buffer_free(buffer **b) |
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183 |
{ |
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|
184 |
int i; |
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185 |
buffer *bf; |
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|
186 |
|
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|
187 |
if (!b || !*b) |
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|
188 |
return; |
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|
189 |
|
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|
190 |
bf=*b; |
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|
191 |
|
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|
192 |
if (bf->blocks) |
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|
193 |
{ |
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|
194 |
for (i=0; i <= bf->lastblock; i++) |
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|
195 |
{ |
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|
196 |
if (bf->blocks[i]) |
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|
197 |
free(bf->blocks[i]); |
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|
198 |
} |
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|
199 |
free(bf->blocks); |
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|
200 |
} |
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|
201 |
free(bf); |
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|
202 |
|
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|
203 |
*b = NULL; |
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|
204 |
} |
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|
205 |