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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBML_XMLParser.h"
#include "SkBML_Verbs.h"
#include "SkStream.h"
#include "SkXMLWriter.h"
static uint8_t rbyte(SkStream& s)
{
uint8_t b;
size_t size = s.read(&b, 1);
SkASSERT(size == 1);
return b;
}
static int rdata(SkStream& s, int data)
{
SkASSERT((data & ~31) == 0);
if (data == 31)
{
data = rbyte(s);
if (data == 0xFF)
{
data = rbyte(s);
data = (data << 8) | rbyte(s);
}
}
return data;
}
static void set(char* array[256], int index, SkStream& s, int data)
{
SkASSERT((unsigned)index <= 255);
size_t size = rdata(s, data);
if (array[index] == NULL)
array[index] = (char*)sk_malloc_throw(size + 1);
else
{
if (strlen(array[index]) < size)
array[index] = (char*)sk_realloc_throw(array[index], size + 1);
}
s.read(array[index], size);
array[index][size] = 0;
}
static void freeAll(char* array[256])
{
for (int i = 0; i < 256; i++)
sk_free(array[i]);
}
struct BMLW {
char* fElems[256];
char* fNames[256];
char* fValues[256];
// important that these are uint8_t, so we get automatic wrap-around
uint8_t fNextElem, fNextName, fNextValue;
BMLW()
{
memset(fElems, 0, sizeof(fElems));
memset(fNames, 0, sizeof(fNames));
memset(fValues, 0, sizeof(fValues));
fNextElem = fNextName = fNextValue = 0;
}
~BMLW()
{
freeAll(fElems);
freeAll(fNames);
freeAll(fValues);
}
};
static void rattr(unsigned verb, SkStream& s, BMLW& rec, SkXMLWriter& writer)
{
int data = verb & 31;
verb >>= 5;
int nameIndex, valueIndex;
switch (verb) {
case kAttr_Value_Value_Verb:
nameIndex = rec.fNextName; // record before the ++
set(rec.fNames, rec.fNextName++, s, data);
valueIndex = rec.fNextValue; // record before the ++
set(rec.fValues, rec.fNextValue++, s, 31);
break;
case kAttr_Value_Index_Verb:
nameIndex = rec.fNextName; // record before the ++
set(rec.fNames, rec.fNextName++, s, data);
valueIndex = rbyte(s);
break;
case kAttr_Index_Value_Verb:
nameIndex = rdata(s, data);
valueIndex = rec.fNextValue; // record before the ++
set(rec.fValues, rec.fNextValue++, s, 31);
break;
case kAttr_Index_Index_Verb:
nameIndex = rdata(s, data);
valueIndex = rbyte(s);
break;
default:
SkDEBUGFAIL("bad verb");
return;
}
writer.addAttribute(rec.fNames[nameIndex], rec.fValues[valueIndex]);
}
static void relem(unsigned verb, SkStream& s, BMLW& rec, SkXMLWriter& writer)
{
int data = verb & 31;
verb >>= 5;
int elemIndex;
if (verb == kStartElem_Value_Verb)
{
elemIndex = rec.fNextElem; // record before the ++
set(rec.fElems, rec.fNextElem++, s, data);
}
else
{
SkASSERT(verb == kStartElem_Index_Verb);
elemIndex = rdata(s, data);
}
writer.startElement(rec.fElems[elemIndex]);
for (;;)
{
verb = rbyte(s);
switch (verb >> 5) {
case kAttr_Value_Value_Verb:
case kAttr_Value_Index_Verb:
case kAttr_Index_Value_Verb:
case kAttr_Index_Index_Verb:
rattr(verb, s, rec, writer);
break;
case kStartElem_Value_Verb:
case kStartElem_Index_Verb:
relem(verb, s, rec, writer);
break;
case kEndElem_Verb:
writer.endElement();
return;
default:
SkDEBUGFAIL("bad verb");
}
}
}
void BML_XMLParser::Read(SkStream& s, SkXMLWriter& writer)
{
BMLW rec;
writer.writeHeader();
relem(rbyte(s), s, rec, writer);
}
void BML_XMLParser::Read(SkStream& s, SkWStream& output)
{
SkXMLStreamWriter writer(&output);
Read(s, writer);
}
void BML_XMLParser::Read(SkStream& s, SkXMLParser& output)
{
SkXMLParserWriter writer(&output);
Read(s, writer);
}
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