/*
?*?buf.c:?memory?buffers?for?libxml2
?*
?*?new?buffer?structures?and?entry?points?to?simplify?the?maintainance
?*?of?libxml2?and?ensure?we?keep?good?control?over?memory?allocations
?*?and?stay?64?bits?clean.
?*?The?new?entry?point?use?the?xmlBufPtr?opaque?structure?and
?*?xmlBuf...（）?counterparts?to?the?old?xmlBuf...（）?functions
?*
?*?See?Copyright?for?the?status?of?this?software.
?*
?*?daniel@veillard.com
?*/

#define?IN_LIBxml
#include?“libxml.h“

#include??/*?for?memset（）?only?!?*/
#include?
#ifdef?HAVE_CTYPE_H
#include?
#endif
#ifdef?HAVE_STDLIB_H
#include?
#endif

#include?l/tree.h>
#include?l/globals.h>
#include?l/tree.h>
#include?“buf.h“

#define?WITH_BUFFER_COMPAT

/**
?*?xmlBuf:
?*
?*?A?buffer?structure.?The?base?of?the?structure?is?somehow?compatible
?*?with?struct?_xmlBuffer?to?limit?risks?on?application?which?accessed
?*?directly?the?input->buf->buffer?structures.
?*/

struct?_xmlBuf?{
????xmlChar?*content;		/*?The?buffer?content?UTF8?*/
????unsigned?int?compat_use;????/*?for?binary?compatibility?*/
????unsigned?int?compat_size;???/*?for?binary?compatibility?*/
????xmlBufferAllocationScheme?alloc;?/*?The?realloc?method?*/
????xmlChar?*contentIO;		/*?in?IO?mode?we?may?have?a?different?base?*/
????size_t?use;		????????/*?The?buffer?size?used?*/
????size_t?size;		/*?The?buffer?size?*/
????xmlBufferPtr?buffer;????????/*?wrapper?for?an?old?buffer?*/
????int?error;??????????????????/*?an?error?code?if?a?failure?occured?*/
};

#ifdef?WITH_BUFFER_COMPAT
/*
?*?Macro?for?compatibility?with?xmlBuffer?to?be?used?after?an?xmlBuf
?*?is?updated.?This?makes?sure?the?compat?fields?are?updated?too.
?*/
#define?UPDATE_COMPAT（buf）				????\
?????if?（buf->size?compat_size?=?buf->size;?\
?????else?buf->compat_size?=?INT_MAX;			????\
?????if?（buf->use?compat_use?=?buf->use;?\
?????else?buf->compat_use?=?INT_MAX;

/*
?*?Macro?for?compatibility?with?xmlBuffer?to?be?used?in?all?the?xmlBuf
?*?entry?points?it?checks?that?the?compat?fields?have?not?been?modified
?*?by?direct?call?to?xmlBuffer?function?from?code?compiled?before?2.9.0?.
?*/
#define?CHECK_COMPAT（buf）				????\
?????if?（buf->size?!=?（size_t）?buf->compat_size）	????\
?????????if?（buf->compat_size?	?????buf->size?=?buf->compat_size;		????\
?????if?（buf->use?!=?（size_t）?buf->compat_use）		????\
?????????if?（buf->compat_use?	?????buf->use?=?buf->compat_use;

#else?/*?!?WITH_BUFFER_COMPAT?*/
#define?UPDATE_COMPAT（buf）
#define?CHECK_COMPAT（buf）
#endif?/*?WITH_BUFFER_COMPAT?*/

/**
?*?xmlBufMemoryError:
?*?@extra:??extra?informations
?*
?*?Handle?an?out?of?memory?condition
?*?To?be?improved...
?*/
static?void
xmlBufMemoryError（xmlBufPtr?buf?const?char?*extra）
{
????__xmlSimpleError（xml_FROM_BUFFER?xml_ERR_NO_MEMORY?NULL?NULL?extra）;
????if?（（buf）?&&?（buf->error?==?0））
????????buf->error?=?xml_ERR_NO_MEMORY;
}

/**
?*?xmlBufOverflowError:
?*?@extra:??extra?informations
?*
?*?Hand