1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/ports/SkXMLPullParser_expat.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,213 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkXMLParser.h"
1.14 +#include "SkChunkAlloc.h"
1.15 +#include "SkString.h"
1.16 +#include "SkStream.h"
1.17 +
1.18 +#include "expat.h"
1.19 +
1.20 +static inline char* dupstr(SkChunkAlloc& chunk, const char src[], size_t len)
1.21 +{
1.22 + SkASSERT(src);
1.23 + char* dst = (char*)chunk.alloc(len + 1, SkChunkAlloc::kThrow_AllocFailType);
1.24 +
1.25 + memcpy(dst, src, len);
1.26 + dst[len] = 0;
1.27 + return dst;
1.28 +}
1.29 +
1.30 +static inline int count_pairs(const char** p)
1.31 +{
1.32 + const char** start = p;
1.33 + while (*p)
1.34 + {
1.35 + SkASSERT(p[1] != NULL);
1.36 + p += 2;
1.37 + }
1.38 + return (p - start) >> 1;
1.39 +}
1.40 +
1.41 +struct Data {
1.42 + Data() : fAlloc(2048), fState(NORMAL) {}
1.43 +
1.44 + XML_Parser fParser;
1.45 + SkXMLPullParser::Curr* fCurr;
1.46 + SkChunkAlloc fAlloc;
1.47 +
1.48 + enum State {
1.49 + NORMAL,
1.50 + MISSED_START_TAG,
1.51 + RETURN_END_TAG
1.52 + };
1.53 + State fState;
1.54 + const char* fEndTag; // if state is RETURN_END_TAG
1.55 +};
1.56 +
1.57 +static void XMLCALL start_proc(void *data, const char *el, const char **attr)
1.58 +{
1.59 + Data* p = (Data*)data;
1.60 + SkXMLPullParser::Curr* c = p->fCurr;
1.61 + SkChunkAlloc& alloc = p->fAlloc;
1.62 +
1.63 + c->fName = dupstr(alloc, el, strlen(el));
1.64 +
1.65 + int n = count_pairs(attr);
1.66 + SkXMLPullParser::AttrInfo* info = (SkXMLPullParser::AttrInfo*)alloc.alloc(n * sizeof(SkXMLPullParser::AttrInfo),
1.67 + SkChunkAlloc::kThrow_AllocFailType);
1.68 + c->fAttrInfoCount = n;
1.69 + c->fAttrInfos = info;
1.70 +
1.71 + for (int i = 0; i < n; i++)
1.72 + {
1.73 + info[i].fName = dupstr(alloc, attr[0], strlen(attr[0]));
1.74 + info[i].fValue = dupstr(alloc, attr[1], strlen(attr[1]));
1.75 + attr += 2;
1.76 + }
1.77 +
1.78 + c->fEventType = SkXMLPullParser::START_TAG;
1.79 + XML_StopParser(p->fParser, true);
1.80 +}
1.81 +
1.82 +static void XMLCALL end_proc(void *data, const char *el)
1.83 +{
1.84 + Data* p = (Data*)data;
1.85 + SkXMLPullParser::Curr* c = p->fCurr;
1.86 +
1.87 + if (c->fEventType == SkXMLPullParser::START_TAG)
1.88 + {
1.89 + /* if we get here, we were called with a start_tag immediately
1.90 + followed by this end_tag. The caller will only see the end_tag,
1.91 + so we set a flag to notify them of the missed start_tag
1.92 + */
1.93 + p->fState = Data::MISSED_START_TAG;
1.94 +
1.95 + SkASSERT(c->fName != NULL);
1.96 + SkASSERT(strcmp(c->fName, el) == 0);
1.97 + }
1.98 + else
1.99 + c->fName = dupstr(p->fAlloc, el, strlen(el));
1.100 +
1.101 + c->fEventType = SkXMLPullParser::END_TAG;
1.102 + XML_StopParser(p->fParser, true);
1.103 +}
1.104 +
1.105 +#include <ctype.h>
1.106 +
1.107 +static bool isws(const char s[])
1.108 +{
1.109 + for (; *s; s++)
1.110 + if (!isspace(*s))
1.111 + return false;
1.112 + return true;
1.113 +}
1.114 +
1.115 +static void XMLCALL text_proc(void* data, const char* text, int len)
1.116 +{
1.117 + Data* p = (Data*)data;
1.118 + SkXMLPullParser::Curr* c = p->fCurr;
1.119 +
1.120 + c->fName = dupstr(p->fAlloc, text, len);
1.121 + c->fIsWhitespace = isws(c->fName);
1.122 +
1.123 + c->fEventType = SkXMLPullParser::TEXT;
1.124 + XML_StopParser(p->fParser, true);
1.125 +}
1.126 +
1.127 +//////////////////////////////////////////////////////////////////////////
1.128 +
1.129 +struct SkXMLPullParser::Impl {
1.130 + Data fData;
1.131 + void* fBuffer;
1.132 + size_t fBufferLen;
1.133 +};
1.134 +
1.135 +static void reportError(XML_Parser parser)
1.136 +{
1.137 + XML_Error code = XML_GetErrorCode(parser);
1.138 + int lineNumber = XML_GetCurrentLineNumber(parser);
1.139 + const char* msg = XML_ErrorString(code);
1.140 +
1.141 + printf("-------- XML error [%d] on line %d, %s\n", code, lineNumber, msg);
1.142 +}
1.143 +
1.144 +bool SkXMLPullParser::onInit()
1.145 +{
1.146 + fImpl = new Impl;
1.147 +
1.148 + XML_Parser p = XML_ParserCreate(NULL);
1.149 + SkASSERT(p);
1.150 +
1.151 + fImpl->fData.fParser = p;
1.152 + fImpl->fData.fCurr = &fCurr;
1.153 +
1.154 + XML_SetElementHandler(p, start_proc, end_proc);
1.155 + XML_SetCharacterDataHandler(p, text_proc);
1.156 + XML_SetUserData(p, &fImpl->fData);
1.157 +
1.158 + size_t len = fStream->getLength();
1.159 + fImpl->fBufferLen = len;
1.160 + fImpl->fBuffer = sk_malloc_throw(len);
1.161 + fStream->rewind();
1.162 + size_t len2 = fStream->read(fImpl->fBuffer, len);
1.163 + return len2 == len;
1.164 +}
1.165 +
1.166 +void SkXMLPullParser::onExit()
1.167 +{
1.168 + sk_free(fImpl->fBuffer);
1.169 + XML_ParserFree(fImpl->fData.fParser);
1.170 + delete fImpl;
1.171 + fImpl = NULL;
1.172 +}
1.173 +
1.174 +SkXMLPullParser::EventType SkXMLPullParser::onNextToken()
1.175 +{
1.176 + if (Data::RETURN_END_TAG == fImpl->fData.fState)
1.177 + {
1.178 + fImpl->fData.fState = Data::NORMAL;
1.179 + fCurr.fName = fImpl->fData.fEndTag; // restore name from (below) save
1.180 + return SkXMLPullParser::END_TAG;
1.181 + }
1.182 +
1.183 + fImpl->fData.fAlloc.reset();
1.184 +
1.185 + XML_Parser p = fImpl->fData.fParser;
1.186 + XML_Status status;
1.187 +
1.188 + status = XML_ResumeParser(p);
1.189 +
1.190 +CHECK_STATUS:
1.191 + switch (status) {
1.192 + case XML_STATUS_OK:
1.193 + return SkXMLPullParser::END_DOCUMENT;
1.194 +
1.195 + case XML_STATUS_ERROR:
1.196 + if (XML_GetErrorCode(p) != XML_ERROR_NOT_SUSPENDED)
1.197 + {
1.198 + reportError(p);
1.199 + return SkXMLPullParser::ERROR;
1.200 + }
1.201 + status = XML_Parse(p, (const char*)fImpl->fBuffer, fImpl->fBufferLen, true);
1.202 + goto CHECK_STATUS;
1.203 +
1.204 + case XML_STATUS_SUSPENDED:
1.205 + if (Data::MISSED_START_TAG == fImpl->fData.fState)
1.206 + {
1.207 + // return a start_tag, and clear the flag so we return end_tag next
1.208 + SkASSERT(SkXMLPullParser::END_TAG == fCurr.fEventType);
1.209 + fImpl->fData.fState = Data::RETURN_END_TAG;
1.210 + fImpl->fData.fEndTag = fCurr.fName; // save this pointer
1.211 + return SkXMLPullParser::START_TAG;
1.212 + }
1.213 + break;
1.214 + }
1.215 + return fCurr.fEventType;
1.216 +}
