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CloverBootloader/rEFIt_UEFI/Platform/plist.cpp

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/*
* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* The contents of this file constitute Original Code as defined in and
* are subject to the Apple Public Source License Version 1.1 (the
* "License"). You may not use this file except in compliance with the
* License. Please obtain a copy of the License at
* http://www.apple.com/publicsource and read it before using this file.
*
* This Original Code and all software distributed under the License are
* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
* License for the specific language governing rights and limitations
* under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/*
* plist.c - plist parsing functions
*
* Copyright (c) 2000-2005 Apple Computer, Inc.
*
* DRI: Josh de Cesare
* code split out from drivers.c by Soren Spies, 2005
*/
//Slice - rewrite for UEFI with more functions like Copyright (c) 2003 Apple Computer
#include "Platform.h"
#ifndef DEBUG_ALL
#define DEBUG_PLIST 0
#else
#define DEBUG_PLIST DEBUG_ALL
#endif
#if DEBUG_PLIST == 0
#define DBG(...)
#else
#define DBG(...) DebugLog(DEBUG_PLIST, __VA_ARGS__)
#endif
SymbolPtr gSymbolsHead = NULL;
TagPtr gTagsFree = NULL;
CHAR8* buffer_start = NULL;
// Forward declarations
EFI_STATUS ParseTagList( CHAR8* buffer, TagPtr * tag, UINT32 type, UINT32 empty, UINT32* lenPtr);
EFI_STATUS ParseTagKey( char * buffer, TagPtr * tag,UINT32* lenPtr);
EFI_STATUS ParseTagString(CHAR8* buffer, TagPtr * tag,UINT32* lenPtr);
EFI_STATUS ParseTagInteger(CHAR8* buffer, TagPtr * tag,UINT32* lenPtr);
EFI_STATUS ParseTagData(CHAR8* buffer, TagPtr * tag,UINT32* lenPtr);
EFI_STATUS ParseTagDate(CHAR8* buffer, TagPtr * tag,UINT32* lenPtr);
EFI_STATUS ParseTagBoolean(CHAR8* buffer, TagPtr * tag, UINT32 type,UINT32* lenPtr);
//defined in Platform.h
//EFI_STATUS GetElement( TagPtr dict, INTN id, TagPtr *dict1);
//INTN GetTagCount( TagPtr dict );
TagPtr NewTag( void );
EFI_STATUS FixDataMatchingTag( CHAR8* buffer, CONST CHAR8* tag,UINT32* lenPtr);
CHAR8* NewSymbol(CHAR8* string);
VOID FreeSymbol(CHAR8* string);
SymbolPtr FindSymbol( char * string, SymbolPtr * prevSymbol );
/* Function for basic XML character entities parsing */
typedef struct XMLEntity {
const CHAR8* name;
UINTN nameLen;
CHAR8 value;
} XMLEntity;
/* This is ugly, but better than specifying the lengths by hand */
#define _e(str,c) {str,sizeof(str)-1,c}
CONST XMLEntity ents[] = {
_e("quot;",'"'), _e("apos;",'\''),
_e("lt;", '<'), _e("gt;", '>'),
_e("amp;", '&')
};
CHAR8*
XMLDecode(CHAR8* src)
{
UINTN len;
CONST CHAR8 *s;
CHAR8 *out, *o;
if (!src) {
return 0;
}
len = AsciiStrLen(src);
#if 0
out = (__typeof__(out))AllocateZeroPool(len+1);
if (!out)
return 0;
#else // unsafe
// out is always <= src, let's overwrite src
out = src;
#endif
o = out;
s = src;
while (s <= src+len) /* Make sure the terminator is also copied */
{
if ( *s == '&' )
{
BOOLEAN entFound = FALSE;
UINTN i;
s++;
for ( i = 0; i < sizeof(ents)/sizeof(ents[0]); i++)
{
if ( AsciiStrnCmp(s, ents[i].name, ents[i].nameLen) == 0 )
{
entFound = TRUE;
break;
}
}
if ( entFound )
{
*o++ = ents[i].value;
s += ents[i].nameLen;
continue;
}
}
*o++ = *s++;
}
return out;
}
INTN GetTagCount( TagPtr dict )
{
INTN count = 0;
TagPtr tagList, tag;
if (!dict || (dict->type != kTagTypeDict && dict->type != kTagTypeArray)) {
return 0;
}
tag = 0;
tagList = dict->tag;
while (tagList)
{
tag = tagList;
tagList = tag->tagNext;
if (((dict->type == kTagTypeDict) && (tag->type == kTagTypeKey)) ||
(dict->type == kTagTypeArray) // If we are an array, any element is valid
)
{
count++;
}
//if(tag->type == kTagTypeKey) printf("Located key %s\n", tag->string);
}
return count;
}
EFI_STATUS GetElement( TagPtr dict, INTN id, TagPtr * dict1)
{
INTN element = 0;
TagPtr child;
if(!dict || !dict1 || ((dict->type != kTagTypeArray) && (dict->type != kTagTypeDict))) {
return EFI_UNSUPPORTED;
}
child = dict->tag;
while (child != NULL)
{
if (((dict->type == kTagTypeDict) && (child->type == kTagTypeKey)) || //in Dict count Keys
(dict->type == kTagTypeArray) // If we are an array, any element is valid
)
{
if (element++ >= id) break;
}
child = child->tagNext;
}
*dict1 = child;
return EFI_SUCCESS;
}
// Expects to see one dictionary in the XML file, the final pos will be returned
// If the pos is not equal to the strlen, then there are multiple dicts
// Puts the first dictionary it finds in the
// tag pointer and returns the end of the dic, or returns -1 if not found.
//
EFI_STATUS ParseXML(const CHAR8* buffer, TagPtr * dict, UINT32 bufSize)
{
EFI_STATUS Status;
UINT32 length = 0;
UINT32 pos = 0;
TagPtr tag = NULL;
CHAR8* configBuffer = NULL;
UINT32 bufferSize = 0;
UINTN i;
if (bufSize) {
bufferSize = bufSize;
} else {
bufferSize = (UINT32)AsciiStrLen(buffer);
}
if(dict == NULL) {
return EFI_INVALID_PARAMETER;
}
configBuffer = (__typeof__(configBuffer))AllocateZeroPool(bufferSize+1);
if(configBuffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
CopyMem(configBuffer, buffer, bufferSize);
for (i=0; i<bufferSize; i++) {
if (configBuffer[i] == 0) {
configBuffer[i] = 0x20; //replace random zero bytes to spaces
}
}
buffer_start = configBuffer;
while (TRUE)
{
Status = XMLParseNextTag(configBuffer + pos, &tag, &length);
if (EFI_ERROR(Status)) {
DBG("error parsing next tag\n");
break;
}
pos += length;
if (tag == NULL) {
continue;
}
if (tag->type == kTagTypeDict) {
break;
}
FreeTag(tag); tag = NULL;
}
// FreePool(configBuffer);
if (EFI_ERROR(Status)) {
return Status;
}
*dict = tag;
return EFI_SUCCESS;
}
//
// xml
//
#define DOFREE 1
//==========================================================================
// GetProperty
TagPtr GetProperty( TagPtr dict, const CHAR8* key )
{
TagPtr tagList, tag;
if (dict->type != kTagTypeDict) {
return NULL;
}
tag = NULL;
tagList = dict->tag;
while (tagList)
{
tag = tagList;
tagList = tag->tagNext;
if ((tag->type != kTagTypeKey) || (tag->string == 0)) {
continue;
}
if (!AsciiStriCmp(tag->string, key)) {
return tag->tag;
}
}
return NULL;
}
TagPtr GetNextProperty(TagPtr dict)
{
TagPtr tagList, tag;
if (dict->type != kTagTypeDict) {
return NULL;
}
tag = NULL;
tagList = dict->tag;
while (tagList)
{
tag = tagList;
tagList = tag->tagNext;
if ((tag->type != kTagTypeKey) || (tag->string == 0)) {
continue;
}
return tag->tag;
}
return NULL;
}
//==========================================================================
// ParseNextTag
EFI_STATUS XMLParseNextTag(CHAR8* buffer, TagPtr* tag, UINT32* lenPtr)
{
EFI_STATUS Status;
UINT32 length = 0;
UINT32 pos = 0;
CHAR8* tagName = NULL;
*lenPtr=0;
Status = GetNextTag((UINT8*)buffer, &tagName, 0, &length);
if (EFI_ERROR(Status)) {
DBG("NextTag error %r\n", Status);
return Status;
}
pos = length;
if (!AsciiStrnCmp(tagName, kXMLTagPList, 6)) {
length=0;
Status=EFI_SUCCESS;
}
/***** dict ****/
else if (!AsciiStrCmp(tagName, kXMLTagDict))
{
DBG("begin dict len=%d\n", length);
Status = ParseTagList(buffer + pos, tag, kTagTypeDict, 0, &length);
}
else if (!AsciiStrCmp(tagName, kXMLTagDict "/"))
{
DBG("end dict len=%d\n", length);
Status = ParseTagList(buffer + pos, tag, kTagTypeDict, 1, &length);
}
else if (!AsciiStrnCmp(tagName, kXMLTagDict " ", 5))
{
DBG("space dict len=%d\n", length);
Status = ParseTagList(buffer + pos, tag, kTagTypeDict, 0, &length);
}
/***** key ****/
else if (!AsciiStrCmp(tagName, kXMLTagKey))
{
DBG("parse key\n");
Status = ParseTagKey(buffer + pos, tag, &length);
}
/***** string ****/
else if (!AsciiStrCmp(tagName, kXMLTagString))
{
DBG("parse String\n");
Status = ParseTagString(buffer + pos, tag, &length);
}
/***** string ****/
else if (!AsciiStrnCmp(tagName, kXMLTagString " ", 7))
{
DBG("parse String len=%d\n", length);
Status = ParseTagString(buffer + pos, tag, &length);
}
/***** integer ****/
else if (!AsciiStrCmp(tagName, kXMLTagInteger))
{
Status = ParseTagInteger(buffer + pos, tag, &length);
}
else if (!AsciiStrnCmp(tagName, kXMLTagInteger " ", 8))
{
Status = ParseTagInteger(buffer + pos, tag, &length);
}
/***** data ****/
else if (!AsciiStrCmp(tagName, kXMLTagData))
{
Status = ParseTagData(buffer + pos, tag, &length);
}
else if (!AsciiStrnCmp(tagName, kXMLTagData " ", 5))
{
Status = ParseTagData(buffer + pos, tag, &length);
}
/***** date ****/
else if (!AsciiStrCmp(tagName, kXMLTagDate))
{
Status = ParseTagDate(buffer + pos, tag, &length);
}
/***** FALSE ****/
else if (!AsciiStrCmp(tagName, kXMLTagFalse))
{
Status = ParseTagBoolean(buffer + pos, tag, kTagTypeFalse, &length);
}
/***** TRUE ****/
else if (!AsciiStrCmp(tagName, kXMLTagTrue))
{
Status = ParseTagBoolean(buffer + pos, tag, kTagTypeTrue, &length);
}
/***** array ****/
else if (!AsciiStrCmp(tagName, kXMLTagArray))
{
Status = ParseTagList(buffer + pos, tag, kTagTypeArray, 0, &length);
}
else if (!AsciiStrnCmp(tagName, kXMLTagArray " ", 6))
{
DBG("begin array len=%d\n", length);
Status = ParseTagList(buffer + pos, tag, kTagTypeArray, 0, &length);
}
else if (!AsciiStrCmp(tagName, kXMLTagArray "/"))
{
DBG("end array len=%d\n", length);
Status = ParseTagList(buffer + pos, tag, kTagTypeArray, 1, &length);
}
/***** unknown ****/
else
{
*tag = NULL;
length = 0;
}
if (EFI_ERROR(Status)) {
return Status;
}
// TODO jief : seems to me that length cannot be -1. Added the cast anyway to avoid regression. If confirmed, the next 3 lines must be removed.
if (length == (UINT32)-1) {
DBG("(length == -1)\n");
return EFI_UNSUPPORTED;
}
*lenPtr = pos + length;
DBG(" len after success parse next tag %d\n", *lenPtr);
return EFI_SUCCESS;
}
//==========================================================================
// ParseTagList
EFI_STATUS ParseTagList( CHAR8* buffer, TagPtr* tag, UINT32 type, UINT32 empty, UINT32* lenPtr)
{
EFI_STATUS Status = EFI_SUCCESS;
UINT32 pos;
TagPtr tagList;
TagPtr tagTail;
TagPtr tmpTag = NULL;
UINT32 length = 0;
if (type == kTagTypeArray) {
DBG("parsing array len=%d\n", *lenPtr);
} else if (type == kTagTypeDict) {
DBG("parsing dict len=%d\n", *lenPtr);
}
tagList = NULL;
tagTail = NULL;
pos = 0;
if (!empty) {
while (TRUE) {
Status = XMLParseNextTag(buffer + pos, &tmpTag, &length);
if (EFI_ERROR(Status)) {
DBG("error XMLParseNextTag in array: %r\n", Status);
break;
}
pos += length;
if (tmpTag == NULL) {
break;
}
if (tagTail) {
tagTail->tagNext = tmpTag;
} else {
tagList = tmpTag;
}
tagTail = tmpTag;
}
if (EFI_ERROR(Status)) {
if (tagList) {
FreeTag(tagList);
}
return Status;
}
}
tmpTag = NewTag();
if (tmpTag == NULL) {
if (tagList) {
FreeTag(tagList);
}
DBG("next tag is NULL\n");
return EFI_OUT_OF_RESOURCES;
}
tmpTag->type = type;
tmpTag->string = 0;
tmpTag->offset = (UINT32)(buffer_start ? buffer - buffer_start : 0);
tmpTag->tag = tagList;
tmpTag->tagNext = 0;
*tag = tmpTag;
*lenPtr=pos;
DBG(" return from ParseTagList with len=%d\n", *lenPtr);
return Status;
}
//==========================================================================
// ParseTagKey
EFI_STATUS ParseTagKey( char * buffer, TagPtr* tag, UINT32* lenPtr)
{
EFI_STATUS Status;
UINT32 length = 0;
UINT32 length2 = 0;
CHAR8* tmpString;
TagPtr tmpTag;
TagPtr subTag = NULL;
Status = FixDataMatchingTag(buffer, kXMLTagKey, &length);
DBG("fixing key len=%d status=%r\n", length, Status);
if (EFI_ERROR(Status)){
return Status;
}
Status = XMLParseNextTag(buffer + length, &subTag, &length2);
if (EFI_ERROR(Status)) {
return Status;
}
tmpTag = NewTag();
if (tmpTag == NULL) {
FreeTag(subTag);
return EFI_OUT_OF_RESOURCES;
}
tmpString = NewSymbol(buffer);
if (tmpString == NULL) {
FreeTag(subTag);
FreeTag(tmpTag);
return EFI_OUT_OF_RESOURCES;
}
tmpTag->type = kTagTypeKey;
tmpTag->string = tmpString;
tmpTag->tag = subTag;
tmpTag->offset = (UINT32)(buffer_start ? buffer - buffer_start: 0);
tmpTag->tagNext = 0;
*tag = tmpTag;
*lenPtr = length + length2;
DBG("parse key '%a' success len=%d\n", tmpString, *lenPtr);
return EFI_SUCCESS;
}
//==========================================================================
// ParseTagString
EFI_STATUS ParseTagString(CHAR8* buffer, TagPtr * tag,UINT32* lenPtr)
{
EFI_STATUS Status;
UINT32 length = 0;
CHAR8* tmpString;
TagPtr tmpTag;
Status = FixDataMatchingTag(buffer, kXMLTagString, &length);
if (EFI_ERROR(Status)) {
return Status;
}
tmpTag = NewTag();
if (tmpTag == NULL) {
return EFI_OUT_OF_RESOURCES;
}
tmpString = XMLDecode(buffer);
tmpString = NewSymbol(tmpString);
if (tmpString == NULL)
{
FreeTag(tmpTag);
return EFI_OUT_OF_RESOURCES;
}
tmpTag->type = kTagTypeString;
tmpTag->string = tmpString;
tmpTag->tag = NULL;
tmpTag->tagNext = NULL;
tmpTag->offset = (UINT32)(buffer_start ? buffer - buffer_start: 0);
*tag = tmpTag;
*lenPtr = length;
DBG(" parse string %a\n", tmpString);
return EFI_SUCCESS;
}
//==========================================================================
// ParseTagInteger
EFI_STATUS ParseTagInteger(CHAR8* buffer, TagPtr * tag,UINT32* lenPtr)
{
EFI_STATUS Status;
UINT32 length = 0;
INTN integer;
UINT32 size;
BOOLEAN negative = FALSE;
CHAR8* val = buffer;
TagPtr tmpTag;
Status = FixDataMatchingTag(buffer, kXMLTagInteger,&length);
if (EFI_ERROR(Status)) {
return Status;
}
tmpTag = NewTag();
if (tmpTag == NULL) {
return EFI_OUT_OF_RESOURCES;
}
size = length;
integer = 0;
if(buffer[0] == '<') {
tmpTag->type = kTagTypeInteger;
tmpTag->string = 0;
tmpTag->tag = 0;
tmpTag->offset = 0;
tmpTag->tagNext = 0;
*tag = tmpTag;
length = 0;
return EFI_SUCCESS;
}
if(size > 1 && (val[1] == 'x' || val[1] == 'X')) { // Hex value
val += 2;
while(*val) {
if ((*val >= '0' && *val <= '9')) { // 0 - 9
integer = (integer * 16) + (*val++ - '0');
}
else if ((*val >= 'a' && *val <= 'f')) { // a - f
integer = (integer * 16) + (*val++ - 'a' + 10);
}
else if ((*val >= 'A' && *val <= 'F')) { // A - F
integer = (integer * 16) + (*val++ - 'a' + 10);
}
else {
MsgLog("ParseTagInteger hex error (0x%x) in buffer %a\n", *val, buffer);
// getchar();
FreeTag(tmpTag);
return EFI_UNSUPPORTED;
}
}
}
else if ( size ) { // Decimal value
if (*val == '-') {
negative = TRUE;
val++;
size--;
}
for (integer = 0; size > 0; size--) {
if(*val) { // UGLY HACK, fix me.
if (*val < '0' || *val > '9') {
MsgLog("ParseTagInteger decimal error (0x%x) in buffer %a\n", *val, buffer);
// getchar();
FreeTag(tmpTag);
return EFI_UNSUPPORTED;
}
integer = (integer * 10) + (*val++ - '0');
}
}
if (negative) {
integer = -integer;
}
}
tmpTag->type = kTagTypeInteger;
tmpTag->string = (CHAR8*)(UINTN)integer;
tmpTag->tag = NULL;
tmpTag->offset = (UINT32)(buffer_start ? buffer - buffer_start: 0);
tmpTag->tagNext = NULL;
*tag = tmpTag;
*lenPtr = length;
return EFI_SUCCESS;
}
//==========================================================================
// ParseTagData
EFI_STATUS ParseTagData(CHAR8* buffer, TagPtr * tag, UINT32* lenPtr)
{
EFI_STATUS Status;
UINT32 length = 0;
UINTN len = 0;
TagPtr tmpTag;
CHAR8* tmpString;
Status = FixDataMatchingTag(buffer, kXMLTagData,&length);
if (EFI_ERROR(Status)) {
return Status;
}
tmpTag = NewTag();
if (tmpTag == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//Slice - correction as Apple 2003
tmpString = NewSymbol(buffer);
tmpTag->type = kTagTypeData;
tmpTag->string = tmpString;
// dmazar: base64 decode data
tmpTag->data = (UINT8 *)Base64DecodeClover(tmpTag->string, &len);
tmpTag->dataLen = len;
tmpTag->tag = NULL;
tmpTag->offset = (UINT32)(buffer_start ? buffer - buffer_start: 0);
tmpTag->tagNext = NULL;
*tag = tmpTag;
*lenPtr = length;
return EFI_SUCCESS;
}
//==========================================================================
// ParseTagDate
EFI_STATUS ParseTagDate(CHAR8* buffer, TagPtr * tag,UINT32* lenPtr)
{
EFI_STATUS Status;
UINT32 length = 0;
TagPtr tmpTag;
Status = FixDataMatchingTag(buffer, kXMLTagDate,&length);
if (EFI_ERROR(Status)) {
return Status;
}
tmpTag = NewTag();
if (tmpTag == NULL) {
return EFI_OUT_OF_RESOURCES;
}
tmpTag->type = kTagTypeDate;
tmpTag->string = NULL;
tmpTag->tag = NULL;
tmpTag->tagNext = NULL;
tmpTag->offset = (UINT32)(buffer_start ? buffer - buffer_start: 0);
*tag = tmpTag;
*lenPtr = length;
return EFI_SUCCESS;
}
//==========================================================================
// ParseTagBoolean
EFI_STATUS ParseTagBoolean(CHAR8* buffer, TagPtr * tag, UINT32 type,UINT32* lenPtr)
{
TagPtr tmpTag;
tmpTag = NewTag();
if (tmpTag == NULL) {
return EFI_OUT_OF_RESOURCES;
}
tmpTag->type = type;
tmpTag->string = NULL;
tmpTag->tag = NULL;
tmpTag->tagNext = NULL;
tmpTag->offset = (UINT32)(buffer_start ? buffer - buffer_start: 0);
*tag = tmpTag;
*lenPtr = 0;
return EFI_SUCCESS;
}
//==========================================================================
// GetNextTag
EFI_STATUS GetNextTag( UINT8* buffer, CHAR8** tag, UINT32* start, UINT32* length)
{
UINT32 cnt, cnt2;
if (tag == NULL) {
return EFI_INVALID_PARAMETER;
}
// Find the start of the tag.
cnt = 0;
while ((buffer[cnt] != '\0') && (buffer[cnt] != '<')) {
cnt++;
}
if (buffer[cnt] == '\0') {
DBG("empty buffer at cnt=%d\n", cnt);
return EFI_UNSUPPORTED;
}
// Find the end of the tag.
cnt2 = cnt + 1;
while ((buffer[cnt2] != '\0') && (buffer[cnt2] != '>')) {
cnt2++;
}
if (buffer[cnt2] == '\0') {
DBG("empty buffer at cnt2=%d\n", cnt2);
return EFI_UNSUPPORTED;
}
// Fix the tag data.
*tag = (CHAR8*)(buffer + cnt + 1);
buffer[cnt2] = '\0';
if (start) {
*start = cnt;
}
*length = cnt2 + 1; //unreal to be -1. This is UINT32
if (*length == (UINT32)-1) {
DBG("GetNextTag with *length == -1\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
//==========================================================================
// FixDataMatchingTag
// Modifies 'buffer' to add a '\0' at the end of the tag matching 'tag'.
// Returns the length of the data found, counting the end tag,
// or -1 if the end tag was not found.
EFI_STATUS FixDataMatchingTag( CHAR8* buffer, CONST CHAR8* tag, UINT32* lenPtr)
{
EFI_STATUS Status;
UINT32 length;
UINT32 start;
UINT32 stop;
CHAR8* endTag;
start = 0;
while (1) {
Status = GetNextTag(((UINT8 *)buffer) + start, &endTag, &stop, &length);
if (EFI_ERROR(Status)) {
return Status;
}
if ((*endTag == '/') && !AsciiStrCmp(endTag + 1, tag)) {
break;
}
start += length;
}
DBG("fix buffer at pos=%d\n", start + stop);
buffer[start + stop] = '\0';
*lenPtr = start + length;
if (*lenPtr == (__typeof(*lenPtr))-1) { // Why is this test. -1 is UINTN_MAX.
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
//==========================================================================
// NewTag
#define TAGCACHESIZE 0x1000
TagPtr NewTag( void )
{
UINT32 cnt;
TagPtr tag;
if (gTagsFree == NULL) {
tag = (TagPtr)AllocateZeroPool(TAGCACHESIZE * sizeof(TagStruct));
if (tag == NULL) {
return NULL;
}
// Initalize the new tags.
for (cnt = 0; cnt < TAGCACHESIZE - 1; cnt++) {
tag[cnt].type = kTagTypeNone;
tag[cnt].tagNext = tag + cnt + 1;
}
tag[TAGCACHESIZE - 1].tagNext = 0;
gTagsFree = tag;
}
tag = gTagsFree;
gTagsFree = tag->tagNext;
if (gTagsFree == NULL) { //end of cache
gTagsFree = NewTag();
tag->tagNext = gTagsFree; //add new cache to old one
}
return tag;
}
#undef TAGCACHESIZE
//==========================================================================
// XMLFreeTag
void FreeTag( TagPtr tag )
{
if (tag == NULL) {
return;
}
if (tag->type != kTagTypeInteger && tag->string) {
FreeSymbol(tag->string);
}
if (tag->data) {
FreePool(tag->data);
}
FreeTag(tag->tag);
FreeTag(tag->tagNext);
// Clear and free the tag.
tag->type = kTagTypeNone;
tag->string = NULL;
tag->data = NULL;
tag->dataLen = 0;
tag->tag = NULL;
tag->offset = 0;
tag->tagNext = gTagsFree;
gTagsFree = tag;
}
CHAR8* NewSymbol(CHAR8* tmpString)
{
#if 0
SymbolPtr lastGuy = 0; // never used
#endif
SymbolPtr symbol;
UINTN len;
// Look for string in the list of symbols.
symbol = FindSymbol(tmpString, 0);
// Add the new symbol.
if (symbol == NULL) {
len = AsciiStrLen(tmpString);
symbol = (SymbolPtr)AllocateZeroPool(sizeof(Symbol) + len + 1);
if (symbol == NULL) {
return NULL;
}
// Set the symbol's data.
symbol->refCount = 0;
AsciiStrnCpyS(symbol->string, len+1, tmpString, len);
// Add the symbol to the list.
symbol->next = gSymbolsHead;
gSymbolsHead = symbol;
}
// Update the refCount and return the string.
symbol->refCount++;
#if 0
if (lastGuy && lastGuy->next != 0) { // lastGuy is always 0, accessing to ((SymbolPtr)null)->next can be dangerous.
return NULL;
}
#endif
return symbol->string;
}
//==========================================================================
// FreeSymbol
void FreeSymbol(CHAR8* tmpString)
{
SymbolPtr symbol, prev;
prev = NULL;
// Look for string in the list of symbols.
symbol = FindSymbol(tmpString, &prev);
if (symbol == NULL) {
return;
}
// Update the refCount.
symbol->refCount--;
if (symbol->refCount != 0) {
return;
}
// Remove the symbol from the list.
if (prev != NULL) {
prev->next = symbol->next;
}
else {
gSymbolsHead = symbol->next;
}
// Free the symbol's memory.
FreePool(symbol);
}
//==========================================================================
// FindSymbol
SymbolPtr FindSymbol(CHAR8 *tmpString, SymbolPtr *prevSymbol )
{
SymbolPtr symbol, prev;
if (tmpString == NULL) {
return NULL;
}
symbol = gSymbolsHead;
prev = NULL;
while (symbol != NULL) {
if (!AsciiStrCmp(symbol->string, tmpString)) {
break;
}
prev = symbol;
symbol = symbol->next;
}
if ((symbol != NULL) && (prevSymbol != NULL)) {
*prevSymbol = prev;
}
return symbol;
}
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