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