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v2.14.4
parserInternals.c
3 649 строк
95 KB
Nick Wellnhofer
parser: Use parser context as default in resource loader
28 май 2025, 16:14
28 май 2025, 16:14
509ea95
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/* * parserInternals.c : Internal routines (and obsolete ones) needed for the * XML and HTML parsers. * * See Copyright for the status of this software. * * daniel@veillard.com */ #define IN_LIBXML #include "libxml.h" #if defined(_WIN32) #define XML_DIR_SEP '\\' #else #define XML_DIR_SEP '/' #endif #include <string.h> #include <ctype.h> #include <stdlib.h> #include <libxml/xmlmemory.h> #include <libxml/tree.h> #include <libxml/parser.h> #include <libxml/parserInternals.h> #include <libxml/entities.h> #include <libxml/xmlerror.h> #include <libxml/encoding.h> #include <libxml/xmlIO.h> #include <libxml/uri.h> #include <libxml/dict.h> #include <libxml/xmlsave.h> #ifdef LIBXML_CATALOG_ENABLED #include <libxml/catalog.h> #endif #include <libxml/chvalid.h> #include <libxml/nanohttp.h> #define CUR(ctxt) ctxt->input->cur #define END(ctxt) ctxt->input->end #include "private/buf.h" #include "private/enc.h" #include "private/error.h" #include "private/io.h" #include "private/memory.h" #include "private/parser.h" #ifndef SIZE_MAX #define SIZE_MAX ((size_t) -1) #endif #define XML_MAX_ERRORS 100 /* * XML_MAX_AMPLIFICATION_DEFAULT is the default maximum allowed amplification * factor of serialized output after entity expansion. */ #define XML_MAX_AMPLIFICATION_DEFAULT 5 /* * Various global defaults for parsing */ /** * xmlCheckVersion: * @version: the include version number * * check the compiled lib version against the include one. */ void xmlCheckVersion(int version) { int myversion = LIBXML_VERSION; xmlInitParser(); if ((myversion / 10000) != (version / 10000)) { xmlPrintErrorMessage( "Fatal: program compiled against libxml %d using libxml %d\n", (version / 10000), (myversion / 10000)); } else if ((myversion / 100) < (version / 100)) { xmlPrintErrorMessage( "Warning: program compiled against libxml %d using older %d\n", (version / 100), (myversion / 100)); } } /************************************************************************ * * * Some factorized error routines * * * ************************************************************************/ /** * xmlCtxtSetErrorHandler: * @ctxt: an XML parser context * @handler: error handler * @data: data for error handler * * Register a callback function that will be called on errors and * warnings. If handler is NULL, the error handler will be deactivated. * * This is the recommended way to collect errors from the parser and * takes precedence over all other error reporting mechanisms. * These are (in order of precedence): * * - per-context structured handler (xmlCtxtSetErrorHandler) * - per-context structured "serror" SAX handler * - global structured handler (xmlSetStructuredErrorFunc) * - per-context generic "error" and "warning" SAX handlers * - global generic handler (xmlSetGenericErrorFunc) * - print to stderr * * Available since 2.13.0. */ void xmlCtxtSetErrorHandler(xmlParserCtxtPtr ctxt, xmlStructuredErrorFunc handler, void *data) { if (ctxt == NULL) return; ctxt->errorHandler = handler; ctxt->errorCtxt = data; } /** * xmlCtxtGetLastError: * @ctx: an XML parser context * * Get the last parsing error registered. * * Returns NULL if no error occurred or a pointer to the error */ const xmlError * xmlCtxtGetLastError(void *ctx) { xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx; if (ctxt == NULL) return (NULL); if (ctxt->lastError.code == XML_ERR_OK) return (NULL); return (&ctxt->lastError); } /** * xmlCtxtResetLastError: * @ctx: an XML parser context * * Cleanup the last global error registered. For parsing error * this does not change the well-formedness result. */ void xmlCtxtResetLastError(void *ctx) { xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx; if (ctxt == NULL) return; ctxt->errNo = XML_ERR_OK; if (ctxt->lastError.code == XML_ERR_OK) return; xmlResetError(&ctxt->lastError); } /** * xmlCtxtErrMemory: * @ctxt: an XML parser context * * Handle an out-of-memory error. * * Available since 2.13.0. */ void xmlCtxtErrMemory(xmlParserCtxtPtr ctxt) { xmlStructuredErrorFunc schannel = NULL; xmlGenericErrorFunc channel = NULL; void *data; if (ctxt == NULL) { xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_PARSER, NULL); return; } ctxt->errNo = XML_ERR_NO_MEMORY; ctxt->instate = XML_PARSER_EOF; /* TODO: Remove after refactoring */ ctxt->wellFormed = 0; ctxt->disableSAX = 2; if (ctxt->errorHandler) { schannel = ctxt->errorHandler; data = ctxt->errorCtxt; } else if ((ctxt->sax->initialized == XML_SAX2_MAGIC) && (ctxt->sax->serror != NULL)) { schannel = ctxt->sax->serror; data = ctxt->userData; } else { channel = ctxt->sax->error; data = ctxt->userData; } xmlRaiseMemoryError(schannel, channel, data, XML_FROM_PARSER, &ctxt->lastError); } /** * xmlCtxtErrIO: * @ctxt: parser context * @code: xmlParserErrors code * @uri: filename or URI (optional) * * If filename is empty, use the one from context input if available. * * Report an IO error to the parser context. */ void xmlCtxtErrIO(xmlParserCtxtPtr ctxt, int code, const char *uri) { const char *errstr, *msg, *str1, *str2; xmlErrorLevel level; if (ctxt == NULL) return; if (((code == XML_IO_ENOENT) || (code == XML_IO_UNKNOWN))) { /* * Only report a warning if a file could not be found. This should * only be done for external entities, but the external entity loader * of xsltproc can try multiple paths and assumes that ENOENT doesn't * raise an error and aborts parsing. */ if (ctxt->validate == 0) level = XML_ERR_WARNING; else level = XML_ERR_ERROR; } else if (code == XML_IO_NETWORK_ATTEMPT) { level = XML_ERR_ERROR; } else { level = XML_ERR_FATAL; } errstr = xmlErrString(code); if (uri == NULL) { msg = "%s\n"; str1 = errstr; str2 = NULL; } else { msg = "failed to load \"%s\": %s\n"; str1 = uri; str2 = errstr; } xmlCtxtErr(ctxt, NULL, XML_FROM_IO, code, level, (const xmlChar *) uri, NULL, NULL, 0, msg, str1, str2); } /** * xmlCtxtIsCatastrophicError: * @ctxt: parser context * * Returns true if the last error is catastrophic. */ int xmlCtxtIsCatastrophicError(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(1); return(xmlIsCatastrophicError(ctxt->lastError.level, ctxt->lastError.code)); } /** * xmlCtxtVErr: * @ctxt: a parser context * @node: the current node or NULL * @domain: the domain for the error * @code: the code for the error * @level: the xmlErrorLevel for the error * @str1: extra string info * @str2: extra string info * @str3: extra string info * @int1: extra int info * @msg: the message to display/transmit * @ap: extra parameters for the message display * * Raise a parser error. */ void xmlCtxtVErr(xmlParserCtxtPtr ctxt, xmlNodePtr node, xmlErrorDomain domain, xmlParserErrors code, xmlErrorLevel level, const xmlChar *str1, const xmlChar *str2, const xmlChar *str3, int int1, const char *msg, va_list ap) { xmlStructuredErrorFunc schannel = NULL; xmlGenericErrorFunc channel = NULL; void *data = NULL; const char *file = NULL; int line = 0; int col = 0; int res; if (code == XML_ERR_NO_MEMORY) { xmlCtxtErrMemory(ctxt); return; } if (ctxt == NULL) { res = xmlVRaiseError(NULL, NULL, NULL, NULL, node, domain, code, level, NULL, 0, (const char *) str1, (const char *) str2, (const char *) str3, int1, 0, msg, ap); if (res < 0) xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_PARSER, NULL); return; } if (PARSER_STOPPED(ctxt)) return; /* Don't overwrite catastrophic errors */ if (xmlCtxtIsCatastrophicError(ctxt)) return; if (level == XML_ERR_WARNING) { if (ctxt->nbWarnings >= XML_MAX_ERRORS) return; ctxt->nbWarnings += 1; } else { /* Report at least one fatal error. */ if ((ctxt->nbErrors >= XML_MAX_ERRORS) && ((level < XML_ERR_FATAL) || (ctxt->wellFormed == 0)) && (!xmlIsCatastrophicError(level, code))) return; ctxt->nbErrors += 1; } if (((ctxt->options & XML_PARSE_NOERROR) == 0) && ((level != XML_ERR_WARNING) || ((ctxt->options & XML_PARSE_NOWARNING) == 0))) { if (ctxt->errorHandler) { schannel = ctxt->errorHandler; data = ctxt->errorCtxt; } else if ((ctxt->sax->initialized == XML_SAX2_MAGIC) && (ctxt->sax->serror != NULL)) { schannel = ctxt->sax->serror; data = ctxt->userData; } else if ((domain == XML_FROM_VALID) || (domain == XML_FROM_DTD)) { if (level == XML_ERR_WARNING) channel = ctxt->vctxt.warning; else channel = ctxt->vctxt.error; data = ctxt->vctxt.userData; } else { if (level == XML_ERR_WARNING) channel = ctxt->sax->warning; else channel = ctxt->sax->error; data = ctxt->userData; } } if (ctxt->input != NULL) { xmlParserInputPtr input = ctxt->input; if ((input->filename == NULL) && (ctxt->inputNr > 1)) { input = ctxt->inputTab[ctxt->inputNr - 2]; } file = input->filename; line = input->line; col = input->col; } res = xmlVRaiseError(schannel, channel, data, ctxt, node, domain, code, level, file, line, (const char *) str1, (const char *) str2, (const char *) str3, int1, col, msg, ap); if (res < 0) { xmlCtxtErrMemory(ctxt); return; } if (level >= XML_ERR_ERROR) ctxt->errNo = code; if (level == XML_ERR_FATAL) { ctxt->wellFormed = 0; if (xmlCtxtIsCatastrophicError(ctxt)) ctxt->disableSAX = 2; /* stop parser */ else if (ctxt->recovery == 0) ctxt->disableSAX = 1; } } /** * xmlCtxtErr: * @ctxt: a parser context * @node: the current node or NULL * @domain: the domain for the error * @code: the code for the error * @level: the xmlErrorLevel for the error * @str1: extra string info * @str2: extra string info * @str3: extra string info * @int1: extra int info * @msg: the message to display/transmit * @...: extra parameters for the message display * * Raise a parser error. */ void xmlCtxtErr(xmlParserCtxtPtr ctxt, xmlNodePtr node, xmlErrorDomain domain, xmlParserErrors code, xmlErrorLevel level, const xmlChar *str1, const xmlChar *str2, const xmlChar *str3, int int1, const char *msg, ...) { va_list ap; va_start(ap, msg); xmlCtxtVErr(ctxt, node, domain, code, level, str1, str2, str3, int1, msg, ap); va_end(ap); } /** * xmlCtxtGetStatus: * @ctxt: an XML parser context * * Get well-formedness and validation status after parsing. Also * reports catastrophic errors which are not related to parsing * like out-of-memory, I/O or other errors. * * Available since 2.14.0. * * Returns a bitmask of XML_STATUS_* flags ORed together. */ xmlParserStatus xmlCtxtGetStatus(xmlParserCtxt *ctxt) { xmlParserStatus bits = 0; if (xmlCtxtIsCatastrophicError(ctxt)) { bits |= XML_STATUS_CATASTROPHIC_ERROR | XML_STATUS_NOT_WELL_FORMED | XML_STATUS_NOT_NS_WELL_FORMED; if ((ctxt != NULL) && (ctxt->validate)) bits |= XML_STATUS_DTD_VALIDATION_FAILED; return(bits); } if (!ctxt->wellFormed) bits |= XML_STATUS_NOT_WELL_FORMED; if (!ctxt->nsWellFormed) bits |= XML_STATUS_NOT_NS_WELL_FORMED; if ((ctxt->validate) && (!ctxt->valid)) bits |= XML_STATUS_DTD_VALIDATION_FAILED; return(bits); } /** * xmlFatalErr: * @ctxt: an XML parser context * @code: the error number * @info: extra information string * * Handle a fatal parser error, i.e. violating Well-Formedness constraints */ void xmlFatalErr(xmlParserCtxtPtr ctxt, xmlParserErrors code, const char *info) { const char *errmsg; errmsg = xmlErrString(code); if (info == NULL) { xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, code, XML_ERR_FATAL, NULL, NULL, NULL, 0, "%s\n", errmsg); } else { xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, code, XML_ERR_FATAL, (const xmlChar *) info, NULL, NULL, 0, "%s: %s\n", errmsg, info); } } /** * xmlIsLetter: * @c: an unicode character (int) * * DEPRECATED: Internal function, don't use. * * Check whether the character is allowed by the production * [84] Letter ::= BaseChar | Ideographic * * Returns 0 if not, non-zero otherwise */ int xmlIsLetter(int c) { return(IS_BASECHAR(c) || IS_IDEOGRAPHIC(c)); } /************************************************************************ * * * Input handling functions for progressive parsing * * * ************************************************************************/ /* we need to keep enough input to show errors in context */ #define LINE_LEN 80 /** * xmlHaltParser: * @ctxt: an XML parser context * * Blocks further parser processing don't override error * for internal use */ void xmlHaltParser(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return; ctxt->instate = XML_PARSER_EOF; /* TODO: Remove after refactoring */ ctxt->disableSAX = 2; } /** * xmlParserInputRead: * @in: an XML parser input * @len: an indicative size for the lookahead * * DEPRECATED: This function was internal and is deprecated. * * Returns -1 as this is an error to use it. */ int xmlParserInputRead(xmlParserInputPtr in ATTRIBUTE_UNUSED, int len ATTRIBUTE_UNUSED) { return(-1); } /** * xmlParserGrow: * @ctxt: an XML parser context * * Grow the input buffer. * * Returns the number of bytes read or -1 in case of error. */ int xmlParserGrow(xmlParserCtxtPtr ctxt) { xmlParserInputPtr in = ctxt->input; xmlParserInputBufferPtr buf = in->buf; size_t curEnd = in->end - in->cur; size_t curBase = in->cur - in->base; size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ? XML_MAX_HUGE_LENGTH : XML_MAX_LOOKUP_LIMIT; int ret; if (buf == NULL) return(0); /* Don't grow push parser buffer. */ if (PARSER_PROGRESSIVE(ctxt)) return(0); /* Don't grow memory buffers. */ if ((buf->encoder == NULL) && (buf->readcallback == NULL)) return(0); if (buf->error != 0) return(-1); if (curBase > maxLength) { xmlFatalErr(ctxt, XML_ERR_RESOURCE_LIMIT, "Buffer size limit exceeded, try XML_PARSE_HUGE\n"); xmlHaltParser(ctxt); return(-1); } if (curEnd >= INPUT_CHUNK) return(0); ret = xmlParserInputBufferGrow(buf, INPUT_CHUNK); xmlBufUpdateInput(buf->buffer, in, curBase); if (ret < 0) { xmlCtxtErrIO(ctxt, buf->error, NULL); } return(ret); } /** * xmlParserCheckEOF: * @ctxt: parser ctxt * @code: error code * * Raises an error with @code if the input wasn't consumed * completely. */ void xmlParserCheckEOF(xmlParserCtxtPtr ctxt, xmlParserErrors code) { xmlParserInputPtr in = ctxt->input; xmlParserInputBufferPtr buf; if (ctxt->errNo != XML_ERR_OK) return; if (in->cur < in->end) { xmlFatalErr(ctxt, code, NULL); return; } buf = in->buf; if ((buf != NULL) && (buf->encoder != NULL)) { size_t curBase = in->cur - in->base; size_t sizeOut = 64; xmlCharEncError ret; /* * Check for truncated multi-byte sequence */ ret = xmlCharEncInput(buf, &sizeOut, /* flush */ 1); xmlBufUpdateInput(buf->buffer, in, curBase); if (ret != XML_ENC_ERR_SUCCESS) { xmlCtxtErrIO(ctxt, buf->error, NULL); return; } /* Shouldn't happen */ if (in->cur < in->end) xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "expected EOF"); } } /** * xmlParserInputGrow: * @in: an XML parser input * @len: an indicative size for the lookahead * * DEPRECATED: Don't use. * * This function increase the input for the parser. It tries to * preserve pointers to the input buffer, and keep already read data * * Returns the amount of char read, or -1 in case of error, 0 indicate the * end of this entity */ int xmlParserInputGrow(xmlParserInputPtr in, int len) { int ret; size_t indx; if ((in == NULL) || (len < 0)) return(-1); if (in->buf == NULL) return(-1); if (in->base == NULL) return(-1); if (in->cur == NULL) return(-1); if (in->buf->buffer == NULL) return(-1); /* Don't grow memory buffers. */ if ((in->buf->encoder == NULL) && (in->buf->readcallback == NULL)) return(0); indx = in->cur - in->base; if (xmlBufUse(in->buf->buffer) > (unsigned int) indx + INPUT_CHUNK) { return(0); } ret = xmlParserInputBufferGrow(in->buf, len); in->base = xmlBufContent(in->buf->buffer); if (in->base == NULL) { in->base = BAD_CAST ""; in->cur = in->base; in->end = in->base; return(-1); } in->cur = in->base + indx; in->end = xmlBufEnd(in->buf->buffer); return(ret); } /** * xmlParserShrink: * @ctxt: an XML parser context * * Shrink the input buffer. */ void xmlParserShrink(xmlParserCtxtPtr ctxt) { xmlParserInputPtr in = ctxt->input; xmlParserInputBufferPtr buf = in->buf; size_t used, res; if (buf == NULL) return; used = in->cur - in->base; if (used > LINE_LEN) { res = xmlBufShrink(buf->buffer, used - LINE_LEN); if (res > 0) { used -= res; if ((res > ULONG_MAX) || (in->consumed > ULONG_MAX - (unsigned long)res)) in->consumed = ULONG_MAX; else in->consumed += res; } xmlBufUpdateInput(buf->buffer, in, used); } } /** * xmlParserInputShrink: * @in: an XML parser input * * DEPRECATED: Don't use. * * This function removes used input for the parser. */ void xmlParserInputShrink(xmlParserInputPtr in) { size_t used; size_t ret; if (in == NULL) return; if (in->buf == NULL) return; if (in->base == NULL) return; if (in->cur == NULL) return; if (in->buf->buffer == NULL) return; used = in->cur - in->base; if (used > LINE_LEN) { ret = xmlBufShrink(in->buf->buffer, used - LINE_LEN); if (ret > 0) { used -= ret; if ((ret > ULONG_MAX) || (in->consumed > ULONG_MAX - (unsigned long)ret)) in->consumed = ULONG_MAX; else in->consumed += ret; } xmlBufUpdateInput(in->buf->buffer, in, used); } } /************************************************************************ * * * UTF8 character input and related functions * * * ************************************************************************/ /** * xmlNextChar: * @ctxt: the XML parser context * * DEPRECATED: Internal function, do not use. * * Skip to the next char input char. */ void xmlNextChar(xmlParserCtxtPtr ctxt) { const unsigned char *cur; size_t avail; int c; if ((ctxt == NULL) || (ctxt->input == NULL)) return; avail = ctxt->input->end - ctxt->input->cur; if (avail < INPUT_CHUNK) { xmlParserGrow(ctxt); if (ctxt->input->cur >= ctxt->input->end) return; avail = ctxt->input->end - ctxt->input->cur; } cur = ctxt->input->cur; c = *cur; if (c < 0x80) { if (c == '\n') { ctxt->input->cur++; ctxt->input->line++; ctxt->input->col = 1; } else if (c == '\r') { /* * 2.11 End-of-Line Handling * the literal two-character sequence "#xD#xA" or a standalone * literal #xD, an XML processor must pass to the application * the single character #xA. */ ctxt->input->cur += ((cur[1] == '\n') ? 2 : 1); ctxt->input->line++; ctxt->input->col = 1; return; } else { ctxt->input->cur++; ctxt->input->col++; } } else { ctxt->input->col++; if ((avail < 2) || (cur[1] & 0xc0) != 0x80) goto encoding_error; if (c < 0xe0) { /* 2-byte code */ if (c < 0xc2) goto encoding_error; ctxt->input->cur += 2; } else { unsigned int val = (c << 8) | cur[1]; if ((avail < 3) || (cur[2] & 0xc0) != 0x80) goto encoding_error; if (c < 0xf0) { /* 3-byte code */ if ((val < 0xe0a0) || ((val >= 0xeda0) && (val < 0xee00))) goto encoding_error; ctxt->input->cur += 3; } else { if ((avail < 4) || ((cur[3] & 0xc0) != 0x80)) goto encoding_error; /* 4-byte code */ if ((val < 0xf090) || (val >= 0xf490)) goto encoding_error; ctxt->input->cur += 4; } } } return; encoding_error: /* Only report the first error */ if ((ctxt->input->flags & XML_INPUT_ENCODING_ERROR) == 0) { xmlCtxtErrIO(ctxt, XML_ERR_INVALID_ENCODING, NULL); ctxt->input->flags |= XML_INPUT_ENCODING_ERROR; } ctxt->input->cur++; } /** * xmlCurrentChar: * @ctxt: the XML parser context * @len: pointer to the length of the char read * * DEPRECATED: Internal function, do not use. * * The current char value, if using UTF-8 this may actually span multiple * bytes in the input buffer. Implement the end of line normalization: * 2.11 End-of-Line Handling * Wherever an external parsed entity or the literal entity value * of an internal parsed entity contains either the literal two-character * sequence "#xD#xA" or a standalone literal #xD, an XML processor * must pass to the application the single character #xA. * This behavior can conveniently be produced by normalizing all * line breaks to #xA on input, before parsing.) * * Returns the current char value and its length */ int xmlCurrentChar(xmlParserCtxtPtr ctxt, int *len) { const unsigned char *cur; size_t avail; int c; if ((ctxt == NULL) || (len == NULL) || (ctxt->input == NULL)) return(0); avail = ctxt->input->end - ctxt->input->cur; if (avail < INPUT_CHUNK) { xmlParserGrow(ctxt); avail = ctxt->input->end - ctxt->input->cur; } cur = ctxt->input->cur; c = *cur; if (c < 0x80) { /* 1-byte code */ if (c < 0x20) { /* * 2.11 End-of-Line Handling * the literal two-character sequence "#xD#xA" or a standalone * literal #xD, an XML processor must pass to the application * the single character #xA. */ if (c == '\r') { /* * TODO: This function shouldn't change the 'cur' pointer * as side effect, but the NEXTL macro in parser.c relies * on this behavior when incrementing line numbers. */ if (cur[1] == '\n') ctxt->input->cur++; *len = 1; c = '\n'; } else if (c == 0) { if (ctxt->input->cur >= ctxt->input->end) { *len = 0; } else { *len = 1; /* * TODO: Null bytes should be handled by callers, * but this can be tricky. */ xmlFatalErr(ctxt, XML_ERR_INVALID_CHAR, "Char 0x0 out of allowed range\n"); } } else { *len = 1; } } else { *len = 1; } return(c); } else { int val; if (avail < 2) goto incomplete_sequence; if ((cur[1] & 0xc0) != 0x80) goto encoding_error; if (c < 0xe0) { /* 2-byte code */ if (c < 0xc2) goto encoding_error; val = (c & 0x1f) << 6; val |= cur[1] & 0x3f; *len = 2; } else { if (avail < 3) goto incomplete_sequence; if ((cur[2] & 0xc0) != 0x80) goto encoding_error; if (c < 0xf0) { /* 3-byte code */ val = (c & 0xf) << 12; val |= (cur[1] & 0x3f) << 6; val |= cur[2] & 0x3f; if ((val < 0x800) || ((val >= 0xd800) && (val < 0xe000))) goto encoding_error; *len = 3; } else { if (avail < 4) goto incomplete_sequence; if ((cur[3] & 0xc0) != 0x80) goto encoding_error; /* 4-byte code */ val = (c & 0x0f) << 18; val |= (cur[1] & 0x3f) << 12; val |= (cur[2] & 0x3f) << 6; val |= cur[3] & 0x3f; if ((val < 0x10000) || (val >= 0x110000)) goto encoding_error; *len = 4; } } return(val); } encoding_error: /* Only report the first error */ if ((ctxt->input->flags & XML_INPUT_ENCODING_ERROR) == 0) { xmlCtxtErrIO(ctxt, XML_ERR_INVALID_ENCODING, NULL); ctxt->input->flags |= XML_INPUT_ENCODING_ERROR; } *len = 1; return(XML_INVALID_CHAR); incomplete_sequence: /* * An encoding problem may arise from a truncated input buffer * splitting a character in the middle. In that case do not raise * an error but return 0. This should only happen when push parsing * char data. */ *len = 0; return(0); } /** * xmlStringCurrentChar: * @ctxt: the XML parser context * @cur: pointer to the beginning of the char * @len: pointer to the length of the char read * * DEPRECATED: Internal function, do not use. * * The current char value, if using UTF-8 this may actually span multiple * bytes in the input buffer. * * Returns the current char value and its length */ int xmlStringCurrentChar(xmlParserCtxtPtr ctxt ATTRIBUTE_UNUSED, const xmlChar *cur, int *len) { int c; if ((cur == NULL) || (len == NULL)) return(0); /* cur is zero-terminated, so we can lie about its length. */ *len = 4; c = xmlGetUTF8Char(cur, len); return((c < 0) ? 0 : c); } /** * xmlCopyCharMultiByte: * @out: pointer to an array of xmlChar * @val: the char value * * DEPRECATED: Internal function, don't use. * * append the char value in the array * * Returns the number of xmlChar written */ int xmlCopyCharMultiByte(xmlChar *out, int val) { if ((out == NULL) || (val < 0)) return(0); /* * We are supposed to handle UTF8, check it's valid * From rfc2044: encoding of the Unicode values on UTF-8: * * UCS-4 range (hex.) UTF-8 octet sequence (binary) * 0000 0000-0000 007F 0xxxxxxx * 0000 0080-0000 07FF 110xxxxx 10xxxxxx * 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx */ if (val >= 0x80) { xmlChar *savedout = out; int bits; if (val < 0x800) { *out++= (val >> 6) | 0xC0; bits= 0; } else if (val < 0x10000) { *out++= (val >> 12) | 0xE0; bits= 6;} else if (val < 0x110000) { *out++= (val >> 18) | 0xF0; bits= 12; } else { #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION xmlAbort("xmlCopyCharMultiByte: codepoint out of range\n"); #endif return(0); } for ( ; bits >= 0; bits-= 6) *out++= ((val >> bits) & 0x3F) | 0x80 ; return (out - savedout); } *out = val; return 1; } /** * xmlCopyChar: * @len: Ignored, compatibility * @out: pointer to an array of xmlChar * @val: the char value * * DEPRECATED: Don't use. * * append the char value in the array * * Returns the number of xmlChar written */ int xmlCopyChar(int len ATTRIBUTE_UNUSED, xmlChar *out, int val) { if ((out == NULL) || (val < 0)) return(0); /* the len parameter is ignored */ if (val >= 0x80) { return(xmlCopyCharMultiByte (out, val)); } *out = val; return 1; } /************************************************************************ * * * Commodity functions to switch encodings * * * ************************************************************************/ /** * xmlCtxtSetCharEncConvImpl: * @ctxt: parser context * @impl: callback * @vctxt: user data * * Installs a custom implementation to convert between character * encodings. * * This bypasses legacy feature like global encoding handlers or * encoding aliases. * * Available since 2.14.0. */ void xmlCtxtSetCharEncConvImpl(xmlParserCtxtPtr ctxt, xmlCharEncConvImpl impl, void *vctxt) { if (ctxt == NULL) return; ctxt->convImpl = impl; ctxt->convCtxt = vctxt; } static xmlParserErrors xmlDetectEBCDIC(xmlParserCtxtPtr ctxt, xmlCharEncodingHandlerPtr *hout) { xmlChar out[200]; xmlParserInputPtr input = ctxt->input; xmlCharEncodingHandlerPtr handler; int inlen, outlen, i; xmlParserErrors code; xmlCharEncError res; *hout = NULL; /* * To detect the EBCDIC code page, we convert the first 200 bytes * to IBM037 (EBCDIC-US) and try to find the encoding declaration. */ code = xmlCreateCharEncodingHandler("IBM037", XML_ENC_INPUT, ctxt->convImpl, ctxt->convCtxt, &handler); if (code != XML_ERR_OK) return(code); outlen = sizeof(out) - 1; inlen = input->end - input->cur; res = xmlEncInputChunk(handler, out, &outlen, input->cur, &inlen, /* flush */ 0); /* * Return the EBCDIC handler if decoding failed. The error will * be reported later. */ if (res < 0) goto done; out[outlen] = 0; for (i = 0; i < outlen; i++) { if (out[i] == '>') break; if ((out[i] == 'e') && (xmlStrncmp(out + i, BAD_CAST "encoding", 8) == 0)) { int start, cur, quote; i += 8; while (IS_BLANK_CH(out[i])) i += 1; if (out[i++] != '=') break; while (IS_BLANK_CH(out[i])) i += 1; quote = out[i++]; if ((quote != '\'') && (quote != '"')) break; start = i; cur = out[i]; while (((cur >= 'a') && (cur <= 'z')) || ((cur >= 'A') && (cur <= 'Z')) || ((cur >= '0') && (cur <= '9')) || (cur == '.') || (cur == '_') || (cur == '-')) cur = out[++i]; if (cur != quote) break; out[i] = 0; xmlCharEncCloseFunc(handler); code = xmlCreateCharEncodingHandler((char *) out + start, XML_ENC_INPUT, ctxt->convImpl, ctxt->convCtxt, &handler); if (code != XML_ERR_OK) return(code); *hout = handler; return(XML_ERR_OK); } } done: /* * Encoding handlers are stateful, so we have to recreate them. */ xmlCharEncCloseFunc(handler); code = xmlCreateCharEncodingHandler("IBM037", XML_ENC_INPUT, ctxt->convImpl, ctxt->convCtxt, &handler); if (code != XML_ERR_OK) return(code); *hout = handler; return(XML_ERR_OK); } /** * xmlSwitchEncoding: * @ctxt: the parser context * @enc: the encoding value (number) * * Use encoding specified by enum to decode input data. This overrides * the encoding found in the XML declaration. * * This function can also be used to override the encoding of chunks * passed to xmlParseChunk. * * Returns 0 in case of success, -1 otherwise */ int xmlSwitchEncoding(xmlParserCtxtPtr ctxt, xmlCharEncoding enc) { xmlCharEncodingHandlerPtr handler = NULL; int ret; xmlParserErrors code; if ((ctxt == NULL) || (ctxt->input == NULL)) return(-1); code = xmlLookupCharEncodingHandler(enc, &handler); if (code != 0) { xmlFatalErr(ctxt, code, NULL); return(-1); } ret = xmlSwitchToEncoding(ctxt, handler); if ((ret >= 0) && (enc == XML_CHAR_ENCODING_NONE)) { ctxt->input->flags &= ~XML_INPUT_HAS_ENCODING; } return(ret); } /** * xmlSwitchInputEncodingName: * @ctxt: the parser context * @input: the input strea, * @encoding: the encoding name * * Returns 0 in case of success, -1 otherwise */ static int xmlSwitchInputEncodingName(xmlParserCtxtPtr ctxt, xmlParserInputPtr input, const char *encoding) { xmlCharEncodingHandlerPtr handler; xmlParserErrors res; if (encoding == NULL) return(-1); res = xmlCreateCharEncodingHandler(encoding, XML_ENC_INPUT, ctxt->convImpl, ctxt->convCtxt, &handler); if (res == XML_ERR_UNSUPPORTED_ENCODING) { xmlWarningMsg(ctxt, XML_ERR_UNSUPPORTED_ENCODING, "Unsupported encoding: %s\n", BAD_CAST encoding, NULL); return(-1); } else if (res != XML_ERR_OK) { xmlFatalErr(ctxt, res, encoding); return(-1); } res = xmlInputSetEncodingHandler(input, handler); if (res != XML_ERR_OK) { xmlCtxtErrIO(ctxt, res, NULL); return(-1); } return(0); } /** * xmlSwitchEncodingName: * @ctxt: the parser context * @encoding: the encoding name * * Use specified encoding to decode input data. This overrides the * encoding found in the XML declaration. * * This function can also be used to override the encoding of chunks * passed to xmlParseChunk. * * Available since 2.13.0. * * Returns 0 in case of success, -1 otherwise */ int xmlSwitchEncodingName(xmlParserCtxtPtr ctxt, const char *encoding) { if (ctxt == NULL) return(-1); return(xmlSwitchInputEncodingName(ctxt, ctxt->input, encoding)); } /** * xmlInputSetEncodingHandler: * @input: the input stream * @handler: the encoding handler * * Use encoding handler to decode input data. * * Closes the handler on error. * * Returns an xmlParserErrors code. */ xmlParserErrors xmlInputSetEncodingHandler(xmlParserInputPtr input, xmlCharEncodingHandlerPtr handler) { xmlParserInputBufferPtr in; xmlBufPtr buf; xmlParserErrors code = XML_ERR_OK; if ((input == NULL) || (input->buf == NULL)) { xmlCharEncCloseFunc(handler); return(XML_ERR_ARGUMENT); } in = input->buf; input->flags |= XML_INPUT_HAS_ENCODING; /* * UTF-8 requires no encoding handler. */ if ((handler != NULL) && (xmlStrcasecmp(BAD_CAST handler->name, BAD_CAST "UTF-8") == 0)) { xmlCharEncCloseFunc(handler); handler = NULL; } if (in->encoder == handler) return(XML_ERR_OK); if (in->encoder != NULL) { /* * Switching encodings during parsing is a really bad idea, * but Chromium can switch between ISO-8859-1 and UTF-16 before * separate calls to xmlParseChunk. * * TODO: We should check whether the "raw" input buffer is empty and * convert the old content using the old encoder. */ xmlCharEncCloseFunc(in->encoder); in->encoder = handler; return(XML_ERR_OK); } buf = xmlBufCreate(XML_IO_BUFFER_SIZE); if (buf == NULL) { xmlCharEncCloseFunc(handler); return(XML_ERR_NO_MEMORY); } in->encoder = handler; in->raw = in->buffer; in->buffer = buf; /* * Is there already some content down the pipe to convert ? */ if (input->end > input->base) { size_t processed; size_t nbchars; xmlCharEncError res; /* * Shrink the current input buffer. * Move it as the raw buffer and create a new input buffer */ processed = input->cur - input->base; xmlBufShrink(in->raw, processed); input->consumed += processed; in->rawconsumed = processed; /* * If we're push-parsing, we must convert the whole buffer. * * If we're pull-parsing, we could be parsing from a huge * memory buffer which we don't want to convert completely. */ if (input->flags & XML_INPUT_PROGRESSIVE) nbchars = SIZE_MAX; else nbchars = 4000 /* MINLEN */; res = xmlCharEncInput(in, &nbchars, /* flush */ 0); if (res != XML_ENC_ERR_SUCCESS) code = in->error; } xmlBufResetInput(in->buffer, input); return(code); } /** * xmlSwitchInputEncoding: * @ctxt: the parser context, only for error reporting * @input: the input stream * @handler: the encoding handler * * DEPRECATED: Internal function, don't use. * * Use encoding handler to decode input data. * * Returns 0 in case of success, -1 otherwise */ int xmlSwitchInputEncoding(xmlParserCtxtPtr ctxt, xmlParserInputPtr input, xmlCharEncodingHandlerPtr handler) { xmlParserErrors code = xmlInputSetEncodingHandler(input, handler); if (code != XML_ERR_OK) { xmlCtxtErrIO(ctxt, code, NULL); return(-1); } return(0); } /** * xmlSwitchToEncoding: * @ctxt: the parser context * @handler: the encoding handler * * Use encoding handler to decode input data. * * This function can be used to enforce the encoding of chunks passed * to xmlParseChunk. * * Returns 0 in case of success, -1 otherwise */ int xmlSwitchToEncoding(xmlParserCtxtPtr ctxt, xmlCharEncodingHandlerPtr handler) { xmlParserErrors code; if (ctxt == NULL) return(-1); code = xmlInputSetEncodingHandler(ctxt->input, handler); if (code != XML_ERR_OK) { xmlCtxtErrIO(ctxt, code, NULL); return(-1); } return(0); } /** * xmlDetectEncoding: * @ctxt: the parser context * * Handle optional BOM, detect and switch to encoding. * * Assumes that there are at least four bytes in the input buffer. */ void xmlDetectEncoding(xmlParserCtxtPtr ctxt) { const xmlChar *in; xmlCharEncoding enc; int bomSize; int autoFlag = 0; if (xmlParserGrow(ctxt) < 0) return; in = ctxt->input->cur; if (ctxt->input->end - in < 4) return; if (ctxt->input->flags & XML_INPUT_HAS_ENCODING) { /* * If the encoding was already set, only skip the BOM which was * possibly decoded to UTF-8. */ if ((in[0] == 0xEF) && (in[1] == 0xBB) && (in[2] == 0xBF)) { ctxt->input->cur += 3; } return; } enc = XML_CHAR_ENCODING_NONE; bomSize = 0; /* * BOM sniffing and detection of initial bytes of an XML * declaration. * * The HTML5 spec doesn't cover UTF-32 (UCS-4) or EBCDIC. */ switch (in[0]) { case 0x00: if ((!ctxt->html) && (in[1] == 0x00) && (in[2] == 0x00) && (in[3] == 0x3C)) { enc = XML_CHAR_ENCODING_UCS4BE; autoFlag = XML_INPUT_AUTO_OTHER; } else if ((in[1] == 0x3C) && (in[2] == 0x00) && (in[3] == 0x3F)) { /* * TODO: The HTML5 spec requires to check that the * next codepoint is an 'x'. */ enc = XML_CHAR_ENCODING_UTF16BE; autoFlag = XML_INPUT_AUTO_UTF16BE; } break; case 0x3C: if (in[1] == 0x00) { if ((!ctxt->html) && (in[2] == 0x00) && (in[3] == 0x00)) { enc = XML_CHAR_ENCODING_UCS4LE; autoFlag = XML_INPUT_AUTO_OTHER; } else if ((in[2] == 0x3F) && (in[3] == 0x00)) { /* * TODO: The HTML5 spec requires to check that the * next codepoint is an 'x'. */ enc = XML_CHAR_ENCODING_UTF16LE; autoFlag = XML_INPUT_AUTO_UTF16LE; } } break; case 0x4C: if ((!ctxt->html) && (in[1] == 0x6F) && (in[2] == 0xA7) && (in[3] == 0x94)) { enc = XML_CHAR_ENCODING_EBCDIC; autoFlag = XML_INPUT_AUTO_OTHER; } break; case 0xEF: if ((in[1] == 0xBB) && (in[2] == 0xBF)) { enc = XML_CHAR_ENCODING_UTF8; autoFlag = XML_INPUT_AUTO_UTF8; bomSize = 3; } break; case 0xFE: if (in[1] == 0xFF) { enc = XML_CHAR_ENCODING_UTF16BE; autoFlag = XML_INPUT_AUTO_UTF16BE; bomSize = 2; } break; case 0xFF: if (in[1] == 0xFE) { enc = XML_CHAR_ENCODING_UTF16LE; autoFlag = XML_INPUT_AUTO_UTF16LE; bomSize = 2; } break; } if (bomSize > 0) { ctxt->input->cur += bomSize; } if (enc != XML_CHAR_ENCODING_NONE) { ctxt->input->flags |= autoFlag; if (enc == XML_CHAR_ENCODING_EBCDIC) { xmlCharEncodingHandlerPtr handler; xmlParserErrors res; res = xmlDetectEBCDIC(ctxt, &handler); if (res != XML_ERR_OK) { xmlFatalErr(ctxt, res, "detecting EBCDIC\n"); } else { xmlSwitchToEncoding(ctxt, handler); } } else { xmlSwitchEncoding(ctxt, enc); } } } /** * xmlSetDeclaredEncoding: * @ctxt: the parser context * @encoding: declared encoding * * Set the encoding from a declaration in the document. * * If no encoding was set yet, switch the encoding. Otherwise, only warn * about encoding mismatches. * * Takes ownership of 'encoding'. */ void xmlSetDeclaredEncoding(xmlParserCtxtPtr ctxt, xmlChar *encoding) { if (((ctxt->input->flags & XML_INPUT_HAS_ENCODING) == 0) && ((ctxt->options & XML_PARSE_IGNORE_ENC) == 0)) { xmlCharEncodingHandlerPtr handler; xmlParserErrors res; /* * xmlSwitchEncodingName treats unsupported encodings as * warnings, but we want it to be an error in an encoding * declaration. */ res = xmlCreateCharEncodingHandler((const char *) encoding, XML_ENC_INPUT, ctxt->convImpl, ctxt->convCtxt, &handler); if (res != XML_ERR_OK) { xmlFatalErr(ctxt, res, (const char *) encoding); xmlFree(encoding); return; } res = xmlInputSetEncodingHandler(ctxt->input, handler); if (res != XML_ERR_OK) { xmlCtxtErrIO(ctxt, res, NULL); xmlFree(encoding); return; } ctxt->input->flags |= XML_INPUT_USES_ENC_DECL; } else if (ctxt->input->flags & XML_INPUT_AUTO_ENCODING) { static const char *allowedUTF8[] = { "UTF-8", "UTF8", NULL }; static const char *allowedUTF16LE[] = { "UTF-16", "UTF-16LE", "UTF16", NULL }; static const char *allowedUTF16BE[] = { "UTF-16", "UTF-16BE", "UTF16", NULL }; const char **allowed = NULL; const char *autoEnc = NULL; switch (ctxt->input->flags & XML_INPUT_AUTO_ENCODING) { case XML_INPUT_AUTO_UTF8: allowed = allowedUTF8; autoEnc = "UTF-8"; break; case XML_INPUT_AUTO_UTF16LE: allowed = allowedUTF16LE; autoEnc = "UTF-16LE"; break; case XML_INPUT_AUTO_UTF16BE: allowed = allowedUTF16BE; autoEnc = "UTF-16BE"; break; } if (allowed != NULL) { const char **p; int match = 0; for (p = allowed; *p != NULL; p++) { if (xmlStrcasecmp(encoding, BAD_CAST *p) == 0) { match = 1; break; } } if (match == 0) { xmlWarningMsg(ctxt, XML_WAR_ENCODING_MISMATCH, "Encoding '%s' doesn't match " "auto-detected '%s'\n", encoding, BAD_CAST autoEnc); xmlFree(encoding); encoding = xmlStrdup(BAD_CAST autoEnc); if (encoding == NULL) xmlCtxtErrMemory(ctxt); } } } if (ctxt->encoding != NULL) xmlFree((xmlChar *) ctxt->encoding); ctxt->encoding = encoding; } /** * xmlCtxtGetDeclaredEncoding: * @ctxt: parser context * * Available since 2.14.0. * * Returns the encoding from the encoding declaration. This can differ * from the actual encoding. */ const xmlChar * xmlCtxtGetDeclaredEncoding(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(NULL); return(ctxt->encoding); } /** * xmlGetActualEncoding: * @ctxt: the parser context * * Returns the actual used to parse the document. This can differ from * the declared encoding. */ const xmlChar * xmlGetActualEncoding(xmlParserCtxtPtr ctxt) { const xmlChar *encoding = NULL; if ((ctxt->input->flags & XML_INPUT_USES_ENC_DECL) || (ctxt->input->flags & XML_INPUT_AUTO_ENCODING)) { /* Preserve encoding exactly */ encoding = ctxt->encoding; } else if ((ctxt->input->buf) && (ctxt->input->buf->encoder)) { encoding = BAD_CAST ctxt->input->buf->encoder->name; } else if (ctxt->input->flags & XML_INPUT_HAS_ENCODING) { encoding = BAD_CAST "UTF-8"; } return(encoding); } /************************************************************************ * * * Commodity functions to handle entities processing * * * ************************************************************************/ /** * xmlFreeInputStream: * @input: an xmlParserInputPtr * * Free up an input stream. */ void xmlFreeInputStream(xmlParserInputPtr input) { if (input == NULL) return; if (input->filename != NULL) xmlFree((char *) input->filename); if (input->version != NULL) xmlFree((char *) input->version); if ((input->free != NULL) && (input->base != NULL)) input->free((xmlChar *) input->base); if (input->buf != NULL) xmlFreeParserInputBuffer(input->buf); xmlFree(input); } /** * xmlNewInputStream: * @ctxt: an XML parser context * * DEPRECATED: Use xmlNewInputFromUrl or similar functions. * * Create a new input stream structure. * * Returns the new input stream or NULL */ xmlParserInputPtr xmlNewInputStream(xmlParserCtxtPtr ctxt) { xmlParserInputPtr input; input = (xmlParserInputPtr) xmlMalloc(sizeof(xmlParserInput)); if (input == NULL) { xmlCtxtErrMemory(ctxt); return(NULL); } memset(input, 0, sizeof(xmlParserInput)); input->line = 1; input->col = 1; return(input); } /** * xmlCtxtNewInputFromUrl: * @ctxt: parser context * @url: filename or URL * @publicId: publid ID from doctype (optional) * @encoding: character encoding (optional) * @flags: unused, pass 0 * * Creates a new parser input from the filesystem, the network or * a user-defined resource loader. * * Returns a new parser input. */ xmlParserInputPtr xmlCtxtNewInputFromUrl(xmlParserCtxtPtr ctxt, const char *url, const char *publicId, const char *encoding, xmlParserInputFlags flags ATTRIBUTE_UNUSED) { xmlParserInputPtr input; if ((ctxt == NULL) || (url == NULL)) return(NULL); input = xmlLoadResource(ctxt, url, publicId, XML_RESOURCE_MAIN_DOCUMENT); if (input == NULL) return(NULL); if (encoding != NULL) xmlSwitchInputEncodingName(ctxt, input, encoding); return(input); } /** * xmlNewInputInternal: * @buf: parser input buffer * @filename: filename or URL * * Internal helper function. * * Returns a new parser input. */ static xmlParserInputPtr xmlNewInputInternal(xmlParserInputBufferPtr buf, const char *filename) { xmlParserInputPtr input; input = (xmlParserInputPtr) xmlMalloc(sizeof(xmlParserInput)); if (input == NULL) { xmlFreeParserInputBuffer(buf); return(NULL); } memset(input, 0, sizeof(xmlParserInput)); input->line = 1; input->col = 1; input->buf = buf; xmlBufResetInput(input->buf->buffer, input); if (filename != NULL) { input->filename = xmlMemStrdup(filename); if (input->filename == NULL) { xmlFreeInputStream(input); return(NULL); } } return(input); } /** * xmlNewInputFromMemory: * @url: base URL (optional) * @mem: pointer to char array * @size: size of array * @flags: optimization hints * * Creates a new parser input to read from a memory area. * * @url is used as base to resolve external entities and for * error reporting. * * If the XML_INPUT_BUF_STATIC flag is set, the memory area must * stay unchanged until parsing has finished. This can avoid * temporary copies. * * If the XML_INPUT_BUF_ZERO_TERMINATED flag is set, the memory * area must contain a zero byte after the buffer at position @size. * This can avoid temporary copies. * * Available since 2.14.0. * * Returns a new parser input or NULL if a memory allocation failed. */ xmlParserInputPtr xmlNewInputFromMemory(const char *url, const void *mem, size_t size, xmlParserInputFlags flags) { xmlParserInputBufferPtr buf; if (mem == NULL) return(NULL); buf = xmlNewInputBufferMemory(mem, size, flags, XML_CHAR_ENCODING_NONE); if (buf == NULL) return(NULL); return(xmlNewInputInternal(buf, url)); } /** * xmlCtxtNewInputFromMemory: * @ctxt: parser context * @url: base URL (optional) * @mem: pointer to char array * @size: size of array * @encoding: character encoding (optional) * @flags: optimization hints * * Returns a new parser input or NULL in case of error. */ xmlParserInputPtr xmlCtxtNewInputFromMemory(xmlParserCtxtPtr ctxt, const char *url, const void *mem, size_t size, const char *encoding, xmlParserInputFlags flags) { xmlParserInputPtr input; if ((ctxt == NULL) || (mem == NULL)) return(NULL); input = xmlNewInputFromMemory(url, mem, size, flags); if (input == NULL) { xmlCtxtErrMemory(ctxt); return(NULL); } if (encoding != NULL) xmlSwitchInputEncodingName(ctxt, input, encoding); return(input); } /** * xmlNewInputFromString: * @url: base URL (optional) * @str: zero-terminated string * @flags: optimization hints * * Creates a new parser input to read from a zero-terminated string. * * @url is used as base to resolve external entities and for * error reporting. * * If the XML_INPUT_BUF_STATIC flag is set, the string must * stay unchanged until parsing has finished. This can avoid * temporary copies. * * Available since 2.14.0. * * Returns a new parser input or NULL if a memory allocation failed. */ xmlParserInputPtr xmlNewInputFromString(const char *url, const char *str, xmlParserInputFlags flags) { xmlParserInputBufferPtr buf; if (str == NULL) return(NULL); buf = xmlNewInputBufferString(str, flags); if (buf == NULL) return(NULL); return(xmlNewInputInternal(buf, url)); } /** * xmlCtxtNewInputFromString: * @ctxt: parser context * @url: base URL (optional) * @str: zero-terminated string * @encoding: character encoding (optional) * @flags: optimization hints * * Returns a new parser input. */ xmlParserInputPtr xmlCtxtNewInputFromString(xmlParserCtxtPtr ctxt, const char *url, const char *str, const char *encoding, xmlParserInputFlags flags) { xmlParserInputPtr input; if ((ctxt == NULL) || (str == NULL)) return(NULL); input = xmlNewInputFromString(url, str, flags); if (input == NULL) { xmlCtxtErrMemory(ctxt); return(NULL); } if (encoding != NULL) xmlSwitchInputEncodingName(ctxt, input, encoding); return(input); } /** * xmlNewInputFromFd: * @url: base URL (optional) * @fd: file descriptor * @flags: input flags * * Creates a new parser input to read from a zero-terminated string. * * @url is used as base to resolve external entities and for * error reporting. * * @fd is closed after parsing has finished. * * Supported @flags are XML_INPUT_UNZIP to decompress data * automatically. This feature is deprecated and will be removed * in a future release. * * Available since 2.14.0. * * Returns a new parser input or NULL if a memory allocation failed. */ xmlParserInputPtr xmlNewInputFromFd(const char *url, int fd, xmlParserInputFlags flags) { xmlParserInputBufferPtr buf; if (fd < 0) return(NULL); buf = xmlAllocParserInputBuffer(XML_CHAR_ENCODING_NONE); if (buf == NULL) return(NULL); if (xmlInputFromFd(buf, fd, flags) != XML_ERR_OK) { xmlFreeParserInputBuffer(buf); return(NULL); } return(xmlNewInputInternal(buf, url)); } /** * xmlCtxtNewInputFromFd: * @ctxt: parser context * @url: base URL (optional) * @fd: file descriptor * @encoding: character encoding (optional) * @flags: unused, pass 0 * * Returns a new parser input. */ xmlParserInputPtr xmlCtxtNewInputFromFd(xmlParserCtxtPtr ctxt, const char *url, int fd, const char *encoding, xmlParserInputFlags flags) { xmlParserInputPtr input; if ((ctxt == NULL) || (fd < 0)) return(NULL); if (ctxt->options & XML_PARSE_UNZIP) flags |= XML_INPUT_UNZIP; input = xmlNewInputFromFd(url, fd, flags); if (input == NULL) { xmlCtxtErrMemory(ctxt); return(NULL); } if (encoding != NULL) xmlSwitchInputEncodingName(ctxt, input, encoding); return(input); } /** * xmlNewInputFromIO: * @url: base URL (optional) * @ioRead: read callback * @ioClose: close callback (optional) * @ioCtxt: IO context * @flags: unused, pass 0 * * Creates a new parser input to read from input callbacks and * cintext. * * @url is used as base to resolve external entities and for * error reporting. * * @ioRead is called to read new data into a provided buffer. * It must return the number of bytes written into the buffer * ot a negative xmlParserErrors code on failure. * * @ioClose is called after parsing has finished. * * @ioCtxt is an opaque pointer passed to the callbacks. * * Available since 2.14.0. * * Returns a new parser input or NULL if a memory allocation failed. */ xmlParserInputPtr xmlNewInputFromIO(const char *url, xmlInputReadCallback ioRead, xmlInputCloseCallback ioClose, void *ioCtxt, xmlParserInputFlags flags ATTRIBUTE_UNUSED) { xmlParserInputBufferPtr buf; if (ioRead == NULL) return(NULL); buf = xmlAllocParserInputBuffer(XML_CHAR_ENCODING_NONE); if (buf == NULL) { if (ioClose != NULL) ioClose(ioCtxt); return(NULL); } buf->context = ioCtxt; buf->readcallback = ioRead; buf->closecallback = ioClose; return(xmlNewInputInternal(buf, url)); } /** * xmlCtxtNewInputFromIO: * @ctxt: parser context * @url: base URL (optional) * @ioRead: read callback * @ioClose: close callback (optional) * @ioCtxt: IO context * @encoding: character encoding (optional) * @flags: unused, pass 0 * * Returns a new parser input. */ xmlParserInputPtr xmlCtxtNewInputFromIO(xmlParserCtxtPtr ctxt, const char *url, xmlInputReadCallback ioRead, xmlInputCloseCallback ioClose, void *ioCtxt, const char *encoding, xmlParserInputFlags flags) { xmlParserInputPtr input; if ((ctxt == NULL) || (ioRead == NULL)) return(NULL); input = xmlNewInputFromIO(url, ioRead, ioClose, ioCtxt, flags); if (input == NULL) { xmlCtxtErrMemory(ctxt); return(NULL); } if (encoding != NULL) xmlSwitchInputEncodingName(ctxt, input, encoding); return(input); } /** * xmlNewPushInput: * @url: base URL (optional) * @chunk: pointer to char array * @size: size of array * * Creates a new parser input for a push parser. * * Returns a new parser input or NULL if a memory allocation failed. */ xmlParserInputPtr xmlNewPushInput(const char *url, const char *chunk, int size) { xmlParserInputBufferPtr buf; xmlParserInputPtr input; buf = xmlAllocParserInputBuffer(XML_CHAR_ENCODING_NONE); if (buf == NULL) return(NULL); input = xmlNewInputInternal(buf, url); if (input == NULL) return(NULL); input->flags |= XML_INPUT_PROGRESSIVE; if ((size > 0) && (chunk != NULL)) { int res; res = xmlParserInputBufferPush(input->buf, size, chunk); xmlBufResetInput(input->buf->buffer, input); if (res < 0) { xmlFreeInputStream(input); return(NULL); } } return(input); } /** * xmlNewIOInputStream: * @ctxt: an XML parser context * @buf: an input buffer * @enc: the charset encoding if known * * Create a new input stream structure encapsulating the @input into * a stream suitable for the parser. * * Returns the new input stream or NULL */ xmlParserInputPtr xmlNewIOInputStream(xmlParserCtxtPtr ctxt, xmlParserInputBufferPtr buf, xmlCharEncoding enc) { xmlParserInputPtr input; const char *encoding; if ((ctxt == NULL) || (buf == NULL)) return(NULL); input = xmlNewInputInternal(buf, NULL); if (input == NULL) { xmlCtxtErrMemory(ctxt); return(NULL); } encoding = xmlGetCharEncodingName(enc); if (encoding != NULL) xmlSwitchInputEncodingName(ctxt, input, encoding); return(input); } /** * xmlNewEntityInputStream: * @ctxt: an XML parser context * @ent: an Entity pointer * * DEPRECATED: Internal function, do not use. * * Create a new input stream based on an xmlEntityPtr * * Returns the new input stream or NULL */ xmlParserInputPtr xmlNewEntityInputStream(xmlParserCtxtPtr ctxt, xmlEntityPtr ent) { xmlParserInputPtr input; if ((ctxt == NULL) || (ent == NULL)) return(NULL); if (ent->content != NULL) { input = xmlCtxtNewInputFromString(ctxt, NULL, (const char *) ent->content, NULL, XML_INPUT_BUF_STATIC); } else if (ent->URI != NULL) { xmlResourceType rtype; if (ent->etype == XML_EXTERNAL_PARAMETER_ENTITY) rtype = XML_RESOURCE_PARAMETER_ENTITY; else rtype = XML_RESOURCE_GENERAL_ENTITY; input = xmlLoadResource(ctxt, (char *) ent->URI, (char *) ent->ExternalID, rtype); } else { return(NULL); } if (input == NULL) return(NULL); input->entity = ent; return(input); } /** * xmlNewStringInputStream: * @ctxt: an XML parser context * @buffer: an memory buffer * * DEPRECATED: Use xmlNewInputFromString. * * Create a new input stream based on a memory buffer. * * Returns the new input stream */ xmlParserInputPtr xmlNewStringInputStream(xmlParserCtxtPtr ctxt, const xmlChar *buffer) { return(xmlCtxtNewInputFromString(ctxt, NULL, (const char *) buffer, NULL, 0)); } /**************************************************************** * * * External entities loading * * * ****************************************************************/ #ifdef LIBXML_CATALOG_ENABLED /** * xmlResolveResourceFromCatalog: * @URL: the URL for the entity to load * @ID: the System ID for the entity to load * @ctxt: the context in which the entity is called or NULL * * Resolves the URL and ID against the appropriate catalog. * This function is used by xmlDefaultExternalEntityLoader and * xmlNoNetExternalEntityLoader. * * Returns a new allocated URL, or NULL. */ static xmlChar * xmlResolveResourceFromCatalog(const char *URL, const char *ID, xmlParserCtxtPtr ctxt) { xmlChar *resource = NULL; xmlCatalogAllow pref; int allowLocal = 0; int allowGlobal = 0; /* * If the resource doesn't exists as a file, * try to load it from the resource pointed in the catalogs */ pref = xmlCatalogGetDefaults(); if ((ctxt != NULL) && (ctxt->catalogs != NULL) && ((pref == XML_CATA_ALLOW_ALL) || (pref == XML_CATA_ALLOW_DOCUMENT))) allowLocal = 1; if (((ctxt == NULL) || ((ctxt->options & XML_PARSE_NO_SYS_CATALOG) == 0)) && ((pref == XML_CATA_ALLOW_ALL) || (pref == XML_CATA_ALLOW_GLOBAL))) allowGlobal = 1; if ((pref != XML_CATA_ALLOW_NONE) && (!xmlNoNetExists(URL))) { /* * Do a local lookup */ if (allowLocal) { resource = xmlCatalogLocalResolve(ctxt->catalogs, (const xmlChar *)ID, (const xmlChar *)URL); } /* * Try a global lookup */ if ((resource == NULL) && (allowGlobal)) { resource = xmlCatalogResolve((const xmlChar *)ID, (const xmlChar *)URL); } if ((resource == NULL) && (URL != NULL)) resource = xmlStrdup((const xmlChar *) URL); /* * TODO: do an URI lookup on the reference */ if ((resource != NULL) && (!xmlNoNetExists((const char *)resource))) { xmlChar *tmp = NULL; if (allowLocal) { tmp = xmlCatalogLocalResolveURI(ctxt->catalogs, resource); } if ((tmp == NULL) && (allowGlobal)) { tmp = xmlCatalogResolveURI(resource); } if (tmp != NULL) { xmlFree(resource); resource = tmp; } } } return resource; } #endif #ifdef LIBXML_HTTP_ENABLED static xmlParserErrors xmlCheckHTTPInputInternal(xmlParserInputPtr input) { const char *encoding; const char *redir; const char *mime; int code; if ((input == NULL) || (input->buf == NULL) || (input->buf->readcallback != xmlIOHTTPRead) || (input->buf->context == NULL)) return(XML_ERR_OK); code = xmlNanoHTTPReturnCode(input->buf->context); if (code >= 400) { /* fatal error */ return(XML_IO_LOAD_ERROR); } mime = xmlNanoHTTPMimeType(input->buf->context); if ((xmlStrstr(BAD_CAST mime, BAD_CAST "/xml")) || (xmlStrstr(BAD_CAST mime, BAD_CAST "+xml"))) { encoding = xmlNanoHTTPEncoding(input->buf->context); if (encoding != NULL) { xmlCharEncodingHandlerPtr handler; xmlParserErrors res; res = xmlOpenCharEncodingHandler(encoding, /* output */ 0, &handler); if (res == 0) xmlInputSetEncodingHandler(input, handler); } } redir = xmlNanoHTTPRedir(input->buf->context); if (redir != NULL) { if (input->filename != NULL) xmlFree((xmlChar *) input->filename); input->filename = xmlMemStrdup(redir); if (input->filename == NULL) return(XML_ERR_NO_MEMORY); } return(XML_ERR_OK); } #endif /* LIBXML_HTTP_ENABLED */ /** * xmlCheckHTTPInput: * @ctxt: an XML parser context * @ret: an XML parser input * * DEPRECATED: Internal function, don't use. * * Check an input in case it was created from an HTTP stream, in that * case it will handle encoding and update of the base URL in case of * redirection. It also checks for HTTP errors in which case the input * is cleanly freed up and an appropriate error is raised in context * * Returns the input or NULL in case of HTTP error. */ xmlParserInputPtr xmlCheckHTTPInput(xmlParserCtxtPtr ctxt, xmlParserInputPtr ret) { /* Avoid unused variable warning if features are disabled. */ (void) ctxt; #ifdef LIBXML_HTTP_ENABLED { int code = xmlCheckHTTPInputInternal(ret); if (code != XML_ERR_OK) { if (ret->filename != NULL) xmlCtxtErrIO(ctxt, XML_IO_LOAD_ERROR, ret->filename); else xmlCtxtErrIO(ctxt, XML_IO_LOAD_ERROR, "<null>"); xmlFreeInputStream(ret); return(NULL); } } #endif return(ret); } /** * xmlNewInputFromUrl: * @filename: the filename to use as entity * @flags: XML_INPUT flags * @out: pointer to new parser input * * Create a new input stream based on a file or a URL. * * The flag XML_INPUT_UNZIP allows decompression. * * The flag XML_INPUT_NETWORK allows network access. * * The following resource loaders will be called if they were * registered (in order of precedence): * * - the per-thread xmlParserInputBufferCreateFilenameFunc set with * xmlParserInputBufferCreateFilenameDefault (deprecated) * - the default loader which will return * - the result from a matching global input callback set with * xmlRegisterInputCallbacks (deprecated) * - a HTTP resource if support is compiled in. * - a file opened from the filesystem, with automatic detection * of compressed files if support is compiled in. * * Available since 2.14.0. * * Returns an xmlParserErrors code. */ xmlParserErrors xmlNewInputFromUrl(const char *filename, xmlParserInputFlags flags, xmlParserInputPtr *out) { xmlParserInputBufferPtr buf; xmlParserInputPtr input; xmlParserErrors code = XML_ERR_OK; if (out == NULL) return(XML_ERR_ARGUMENT); *out = NULL; if (filename == NULL) return(XML_ERR_ARGUMENT); if (xmlParserInputBufferCreateFilenameValue != NULL) { buf = xmlParserInputBufferCreateFilenameValue(filename, XML_CHAR_ENCODING_NONE); if (buf == NULL) code = XML_IO_ENOENT; } else { code = xmlParserInputBufferCreateUrl(filename, XML_CHAR_ENCODING_NONE, flags, &buf); } if (code != XML_ERR_OK) return(code); input = xmlNewInputInternal(buf, filename); if (input == NULL) return(XML_ERR_NO_MEMORY); #ifdef LIBXML_HTTP_ENABLED code = xmlCheckHTTPInputInternal(input); if (code != XML_ERR_OK) { xmlFreeInputStream(input); return(code); } #endif *out = input; return(XML_ERR_OK); } /** * xmlNewInputFromFile: * @ctxt: an XML parser context * @filename: the filename to use as entity * * DEPRECATED: Use xmlNewInputFromUrl. * * Create a new input stream based on a file or an URL. * * Returns the new input stream or NULL in case of error */ xmlParserInputPtr xmlNewInputFromFile(xmlParserCtxtPtr ctxt, const char *filename) { xmlParserInputPtr input; xmlParserInputFlags flags = 0; xmlParserErrors code; if ((ctxt == NULL) || (filename == NULL)) return(NULL); if (ctxt->options & XML_PARSE_UNZIP) flags |= XML_INPUT_UNZIP; if ((ctxt->options & XML_PARSE_NONET) == 0) flags |= XML_INPUT_NETWORK; code = xmlNewInputFromUrl(filename, flags, &input); if (code != XML_ERR_OK) { xmlCtxtErrIO(ctxt, code, filename); return(NULL); } return(input); } /** * xmlDefaultExternalEntityLoader: * @URL: the URL for the entity to load * @ID: the System ID for the entity to load * @ctxt: the context in which the entity is called or NULL * * By default we don't load external entities, yet. * * Returns a new allocated xmlParserInputPtr, or NULL. */ static xmlParserInputPtr xmlDefaultExternalEntityLoader(const char *url, const char *ID, xmlParserCtxtPtr ctxt) { xmlParserInputPtr input = NULL; char *resource = NULL; (void) ID; if (url == NULL) return(NULL); #ifdef LIBXML_CATALOG_ENABLED resource = (char *) xmlResolveResourceFromCatalog(url, ID, ctxt); if (resource != NULL) url = resource; #endif if ((ctxt != NULL) && (ctxt->options & XML_PARSE_NONET) && (xmlStrncasecmp(BAD_CAST url, BAD_CAST "http://", 7) == 0)) { xmlCtxtErrIO(ctxt, XML_IO_NETWORK_ATTEMPT, url); } else { input = xmlNewInputFromFile(ctxt, url); } if (resource != NULL) xmlFree(resource); return(input); } /** * xmlNoNetExternalEntityLoader: * @URL: the URL for the entity to load * @ID: the System ID for the entity to load * @ctxt: the context in which the entity is called or NULL * * DEPRECATED: Use XML_PARSE_NONET. * * A specific entity loader disabling network accesses, though still * allowing local catalog accesses for resolution. * * Returns a new allocated xmlParserInputPtr, or NULL. */ xmlParserInputPtr xmlNoNetExternalEntityLoader(const char *URL, const char *ID, xmlParserCtxtPtr ctxt) { int oldOptions = 0; xmlParserInputPtr input; if (ctxt != NULL) { oldOptions = ctxt->options; ctxt->options |= XML_PARSE_NONET; } input = xmlDefaultExternalEntityLoader(URL, ID, ctxt); if (ctxt != NULL) ctxt->options = oldOptions; return(input); } /* * This global has to die eventually */ static xmlExternalEntityLoader xmlCurrentExternalEntityLoader = xmlDefaultExternalEntityLoader; /** * xmlSetExternalEntityLoader: * @f: the new entity resolver function * * DEPRECATED: This is a global setting and not thread-safe. Use * xmlCtxtSetResourceLoader or similar functions. * * Changes the default external entity resolver function for the * application. */ void xmlSetExternalEntityLoader(xmlExternalEntityLoader f) { xmlCurrentExternalEntityLoader = f; } /** * xmlGetExternalEntityLoader: * * DEPRECATED: See xmlSetExternalEntityLoader. * * Get the default external entity resolver function for the application * * Returns the xmlExternalEntityLoader function pointer */ xmlExternalEntityLoader xmlGetExternalEntityLoader(void) { return(xmlCurrentExternalEntityLoader); } /** * xmlCtxtSetResourceLoader: * @ctxt: parser context * @loader: callback * @vctxt: user data * * Installs a custom callback to load documents, DTDs or external * entities. * * If @vctxt is NULL, the parser context will be passed. * * Available since 2.14.0. */ void xmlCtxtSetResourceLoader(xmlParserCtxtPtr ctxt, xmlResourceLoader loader, void *vctxt) { if (ctxt == NULL) return; ctxt->resourceLoader = loader; ctxt->resourceCtxt = vctxt; } /** * xmlLoadResource: * @ctxt: parser context * @url: the URL for the entity to load * @publicId: the Public ID for the entity to load * @type: resource type * * Returns the xmlParserInputPtr or NULL in case of error. */ xmlParserInputPtr xmlLoadResource(xmlParserCtxtPtr ctxt, const char *url, const char *publicId, xmlResourceType type) { char *canonicFilename; xmlParserInputPtr ret; if (url == NULL) return(NULL); if ((ctxt != NULL) && (ctxt->resourceLoader != NULL)) { char *resource = NULL; void *userData; xmlParserInputFlags flags = 0; int code; #ifdef LIBXML_CATALOG_ENABLED resource = (char *) xmlResolveResourceFromCatalog(url, publicId, ctxt); if (resource != NULL) url = resource; #endif if (ctxt->options & XML_PARSE_UNZIP) flags |= XML_INPUT_UNZIP; if ((ctxt->options & XML_PARSE_NONET) == 0) flags |= XML_INPUT_NETWORK; userData = ctxt->resourceCtxt; if (userData == NULL) userData = ctxt; code = ctxt->resourceLoader(userData, url, publicId, type, flags, &ret); if (code != XML_ERR_OK) { xmlCtxtErrIO(ctxt, code, url); ret = NULL; } if (resource != NULL) xmlFree(resource); return(ret); } canonicFilename = (char *) xmlCanonicPath((const xmlChar *) url); if (canonicFilename == NULL) { xmlCtxtErrMemory(ctxt); return(NULL); } ret = xmlCurrentExternalEntityLoader(canonicFilename, publicId, ctxt); xmlFree(canonicFilename); return(ret); } /** * xmlLoadExternalEntity: * @URL: the URL for the entity to load * @ID: the Public ID for the entity to load * @ctxt: the context in which the entity is called or NULL * * @URL is a filename or URL. If if contains the substring "://", * it is assumed to be a Legacy Extended IRI. Otherwise, it is * treated as a filesystem path. * * @ID is an optional XML public ID, typically from a doctype * declaration. It is used for catalog lookups. * * If catalog lookup is enabled (default is yes) and URL or ID are * found in system or local XML catalogs, URL is replaced with the * result. Then the following resource loaders will be called if * they were registered (in order of precedence): * * - the resource loader set with xmlCtxtSetResourceLoader * - the global external entity loader set with * xmlSetExternalEntityLoader (without catalog resolution, * deprecated) * - the per-thread xmlParserInputBufferCreateFilenameFunc set with * xmlParserInputBufferCreateFilenameDefault (deprecated) * - the default loader which will return * - the result from a matching global input callback set with * xmlRegisterInputCallbacks (deprecated) * - a HTTP resource if support is compiled in. * - a file opened from the filesystem, with automatic detection * of compressed files if support is compiled in. * * Returns the xmlParserInputPtr or NULL */ xmlParserInputPtr xmlLoadExternalEntity(const char *URL, const char *ID, xmlParserCtxtPtr ctxt) { return(xmlLoadResource(ctxt, URL, ID, XML_RESOURCE_UNKNOWN)); } /************************************************************************ * * * Commodity functions to handle parser contexts * * * ************************************************************************/ /** * xmlInitSAXParserCtxt: * @ctxt: XML parser context * @sax: SAX handlert * @userData: user data * * Initialize a SAX parser context * * Returns 0 in case of success and -1 in case of error */ static int xmlInitSAXParserCtxt(xmlParserCtxtPtr ctxt, const xmlSAXHandler *sax, void *userData) { xmlParserInputPtr input; #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION size_t initialNodeTabSize = 1; #else size_t initialNodeTabSize = 10; #endif if (ctxt == NULL) return(-1); if (ctxt->dict == NULL) ctxt->dict = xmlDictCreate(); if (ctxt->dict == NULL) return(-1); if (ctxt->sax == NULL) ctxt->sax = (xmlSAXHandler *) xmlMalloc(sizeof(xmlSAXHandler)); if (ctxt->sax == NULL) return(-1); if (sax == NULL) { memset(ctxt->sax, 0, sizeof(xmlSAXHandler)); xmlSAXVersion(ctxt->sax, 2); ctxt->userData = ctxt; } else { if (sax->initialized == XML_SAX2_MAGIC) { memcpy(ctxt->sax, sax, sizeof(xmlSAXHandler)); } else { memset(ctxt->sax, 0, sizeof(xmlSAXHandler)); memcpy(ctxt->sax, sax, sizeof(xmlSAXHandlerV1)); } ctxt->userData = userData ? userData : ctxt; } ctxt->maxatts = 0; ctxt->atts = NULL; /* Allocate the Input stack */ if (ctxt->inputTab == NULL) { #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION size_t initialSize = 1; #else size_t initialSize = 5; #endif ctxt->inputTab = xmlMalloc(initialSize * sizeof(xmlParserInputPtr)); ctxt->inputMax = initialSize; } if (ctxt->inputTab == NULL) return(-1); while ((input = xmlCtxtPopInput(ctxt)) != NULL) { /* Non consuming */ xmlFreeInputStream(input); } ctxt->inputNr = 0; ctxt->input = NULL; ctxt->version = NULL; ctxt->encoding = NULL; ctxt->standalone = -1; ctxt->hasExternalSubset = 0; ctxt->hasPErefs = 0; ctxt->html = 0; ctxt->instate = XML_PARSER_START; /* Allocate the Node stack */ if (ctxt->nodeTab == NULL) { ctxt->nodeTab = xmlMalloc(initialNodeTabSize * sizeof(xmlNodePtr)); ctxt->nodeMax = initialNodeTabSize; } if (ctxt->nodeTab == NULL) return(-1); ctxt->nodeNr = 0; ctxt->node = NULL; /* Allocate the Name stack */ if (ctxt->nameTab == NULL) { ctxt->nameTab = xmlMalloc(initialNodeTabSize * sizeof(xmlChar *)); ctxt->nameMax = initialNodeTabSize; } if (ctxt->nameTab == NULL) return(-1); ctxt->nameNr = 0; ctxt->name = NULL; /* Allocate the space stack */ if (ctxt->spaceTab == NULL) { ctxt->spaceTab = xmlMalloc(initialNodeTabSize * sizeof(int)); ctxt->spaceMax = initialNodeTabSize; } if (ctxt->spaceTab == NULL) return(-1); ctxt->spaceNr = 1; ctxt->spaceTab[0] = -1; ctxt->space = &ctxt->spaceTab[0]; ctxt->myDoc = NULL; ctxt->wellFormed = 1; ctxt->nsWellFormed = 1; ctxt->valid = 1; ctxt->options = XML_PARSE_NODICT; /* * Initialize some parser options from deprecated global variables. * Note that the "modern" API taking options arguments or * xmlCtxtSetOptions will ignore these defaults. They're only * relevant if old API functions like xmlParseFile are used. */ ctxt->loadsubset = xmlLoadExtDtdDefaultValue; if (ctxt->loadsubset) { ctxt->options |= XML_PARSE_DTDLOAD; } ctxt->validate = xmlDoValidityCheckingDefaultValue; if (ctxt->validate) { ctxt->options |= XML_PARSE_DTDVALID; } ctxt->pedantic = xmlPedanticParserDefaultValue; if (ctxt->pedantic) { ctxt->options |= XML_PARSE_PEDANTIC; } ctxt->linenumbers = xmlLineNumbersDefaultValue; ctxt->keepBlanks = xmlKeepBlanksDefaultValue; if (ctxt->keepBlanks == 0) { ctxt->sax->ignorableWhitespace = xmlSAX2IgnorableWhitespace; ctxt->options |= XML_PARSE_NOBLANKS; } ctxt->replaceEntities = xmlSubstituteEntitiesDefaultValue; if (ctxt->replaceEntities) { ctxt->options |= XML_PARSE_NOENT; } if (xmlGetWarningsDefaultValue == 0) ctxt->options |= XML_PARSE_NOWARNING; ctxt->vctxt.flags = XML_VCTXT_USE_PCTXT; ctxt->vctxt.userData = ctxt; ctxt->vctxt.error = xmlParserValidityError; ctxt->vctxt.warning = xmlParserValidityWarning; ctxt->record_info = 0; ctxt->checkIndex = 0; ctxt->inSubset = 0; ctxt->errNo = XML_ERR_OK; ctxt->depth = 0; ctxt->catalogs = NULL; ctxt->sizeentities = 0; ctxt->sizeentcopy = 0; ctxt->input_id = 1; ctxt->maxAmpl = XML_MAX_AMPLIFICATION_DEFAULT; xmlInitNodeInfoSeq(&ctxt->node_seq); if (ctxt->nsdb == NULL) { ctxt->nsdb = xmlParserNsCreate(); if (ctxt->nsdb == NULL) return(-1); } return(0); } /** * xmlInitParserCtxt: * @ctxt: an XML parser context * * DEPRECATED: Internal function which will be made private in a future * version. * * Initialize a parser context * * Returns 0 in case of success and -1 in case of error */ int xmlInitParserCtxt(xmlParserCtxtPtr ctxt) { return(xmlInitSAXParserCtxt(ctxt, NULL, NULL)); } /** * xmlFreeParserCtxt: * @ctxt: an XML parser context * * Free all the memory used by a parser context. However the parsed * document in ctxt->myDoc is not freed. */ void xmlFreeParserCtxt(xmlParserCtxtPtr ctxt) { xmlParserInputPtr input; if (ctxt == NULL) return; while ((input = xmlCtxtPopInput(ctxt)) != NULL) { /* Non consuming */ xmlFreeInputStream(input); } if (ctxt->spaceTab != NULL) xmlFree(ctxt->spaceTab); if (ctxt->nameTab != NULL) xmlFree((xmlChar * *)ctxt->nameTab); if (ctxt->nodeTab != NULL) xmlFree(ctxt->nodeTab); if (ctxt->nodeInfoTab != NULL) xmlFree(ctxt->nodeInfoTab); if (ctxt->inputTab != NULL) xmlFree(ctxt->inputTab); if (ctxt->version != NULL) xmlFree((char *) ctxt->version); if (ctxt->encoding != NULL) xmlFree((char *) ctxt->encoding); if (ctxt->extSubURI != NULL) xmlFree((char *) ctxt->extSubURI); if (ctxt->extSubSystem != NULL) xmlFree((char *) ctxt->extSubSystem); #ifdef LIBXML_SAX1_ENABLED if ((ctxt->sax != NULL) && (ctxt->sax != (xmlSAXHandlerPtr) &xmlDefaultSAXHandler)) #else if (ctxt->sax != NULL) #endif /* LIBXML_SAX1_ENABLED */ xmlFree(ctxt->sax); if (ctxt->directory != NULL) xmlFree(ctxt->directory); if (ctxt->vctxt.nodeTab != NULL) xmlFree(ctxt->vctxt.nodeTab); if (ctxt->atts != NULL) xmlFree((xmlChar * *)ctxt->atts); if (ctxt->dict != NULL) xmlDictFree(ctxt->dict); if (ctxt->nsTab != NULL) xmlFree(ctxt->nsTab); if (ctxt->nsdb != NULL) xmlParserNsFree(ctxt->nsdb); if (ctxt->attrHash != NULL) xmlFree(ctxt->attrHash); if (ctxt->pushTab != NULL) xmlFree(ctxt->pushTab); if (ctxt->attallocs != NULL) xmlFree(ctxt->attallocs); if (ctxt->attsDefault != NULL) xmlHashFree(ctxt->attsDefault, xmlHashDefaultDeallocator); if (ctxt->attsSpecial != NULL) xmlHashFree(ctxt->attsSpecial, NULL); if (ctxt->freeElems != NULL) { xmlNodePtr cur, next; cur = ctxt->freeElems; while (cur != NULL) { next = cur->next; xmlFree(cur); cur = next; } } if (ctxt->freeAttrs != NULL) { xmlAttrPtr cur, next; cur = ctxt->freeAttrs; while (cur != NULL) { next = cur->next; xmlFree(cur); cur = next; } } /* * cleanup the error strings */ if (ctxt->lastError.message != NULL) xmlFree(ctxt->lastError.message); if (ctxt->lastError.file != NULL) xmlFree(ctxt->lastError.file); if (ctxt->lastError.str1 != NULL) xmlFree(ctxt->lastError.str1); if (ctxt->lastError.str2 != NULL) xmlFree(ctxt->lastError.str2); if (ctxt->lastError.str3 != NULL) xmlFree(ctxt->lastError.str3); #ifdef LIBXML_CATALOG_ENABLED if (ctxt->catalogs != NULL) xmlCatalogFreeLocal(ctxt->catalogs); #endif xmlFree(ctxt); } /** * xmlNewParserCtxt: * * Allocate and initialize a new parser context. * * Returns the xmlParserCtxtPtr or NULL */ xmlParserCtxtPtr xmlNewParserCtxt(void) { return(xmlNewSAXParserCtxt(NULL, NULL)); } /** * xmlNewSAXParserCtxt: * @sax: SAX handler * @userData: user data * * Allocate and initialize a new SAX parser context. If userData is NULL, * the parser context will be passed as user data. * * Available since 2.11.0. If you want support older versions, * it's best to invoke xmlNewParserCtxt and set ctxt->sax with * struct assignment. * * Returns the xmlParserCtxtPtr or NULL if memory allocation failed. */ xmlParserCtxtPtr xmlNewSAXParserCtxt(const xmlSAXHandler *sax, void *userData) { xmlParserCtxtPtr ctxt; xmlInitParser(); ctxt = (xmlParserCtxtPtr) xmlMalloc(sizeof(xmlParserCtxt)); if (ctxt == NULL) return(NULL); memset(ctxt, 0, sizeof(xmlParserCtxt)); if (xmlInitSAXParserCtxt(ctxt, sax, userData) < 0) { xmlFreeParserCtxt(ctxt); return(NULL); } return(ctxt); } /** * xmlCtxtGetPrivate: * @ctxt: parser context * * Available since 2.14.0. * * Returns the private application data. */ void * xmlCtxtGetPrivate(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(NULL); return(ctxt->_private); } /** * xmlCtxtSetPrivate: * @ctxt: parser context * @priv: private application data * * Available since 2.14.0. * * Set the private application data. */ void xmlCtxtSetPrivate(xmlParserCtxtPtr ctxt, void *priv) { if (ctxt == NULL) return; ctxt->_private = priv; } /** * xmlCtxtGetCatalogs: * @ctxt: parser context * * Available since 2.14.0. * * Returns the local catalogs. */ void * xmlCtxtGetCatalogs(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(NULL); return(ctxt->catalogs); } /** * xmlCtxtSetCatalogs: * @ctxt: parser context * @catalogs: catalogs pointer * * Available since 2.14.0. * * Set the local catalogs. */ void xmlCtxtSetCatalogs(xmlParserCtxtPtr ctxt, void *catalogs) { if (ctxt == NULL) return; ctxt->catalogs = catalogs; } /** * xmlCtxtGetDict: * @ctxt: parser context * * Available since 2.14.0. * * Returns the dictionary. */ xmlDictPtr xmlCtxtGetDict(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(NULL); return(ctxt->dict); } /** * xmlCtxtSetDict: * @ctxt: parser context * @dict: dictionary * * Available since 2.14.0. * * Set the dictionary. This should only be done immediately after * creating a parser context. */ void xmlCtxtSetDict(xmlParserCtxtPtr ctxt, xmlDictPtr dict) { if (ctxt == NULL) return; if (ctxt->dict != NULL) xmlDictFree(ctxt->dict); xmlDictReference(dict); ctxt->dict = dict; } /** * xmlCtxtGetSaxHandler: * @ctxt: parser context * * Available since 2.14.0. * * Returns the SAX handler struct. This is not a copy and must not * be freed. Handlers can be updated. */ xmlSAXHandler * xmlCtxtGetSaxHandler(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(NULL); return(ctxt->sax); } /** * xmlCtxtSetSaxHandler: * @ctxt: parser context * @sax: SAX handler * * Available since 2.14.0. * * Set the SAX handler struct to a copy of @sax. * * Returns 0 on success or -1 if arguments are invalid or a memory * allocation failed. */ int xmlCtxtSetSaxHandler(xmlParserCtxtPtr ctxt, const xmlSAXHandler *sax) { xmlSAXHandler *copy; if ((ctxt == NULL) || (sax == NULL)) return(-1); copy = xmlMalloc(sizeof(*copy)); if (copy == NULL) return(-1); memcpy(copy, sax, sizeof(*copy)); ctxt->sax = copy; return(0); } /** * xmlCtxtGetDocument: * @ctxt: parser context * * Available since 2.14.0. * * Returns the parsed document or NULL if a fatal error occurred when * parsing. The document must be freed by the caller. Resets the * context's document to NULL. */ xmlDocPtr xmlCtxtGetDocument(xmlParserCtxtPtr ctxt) { xmlDocPtr doc; if (ctxt == NULL) return(NULL); if ((ctxt->wellFormed) || (((ctxt->recovery) || (ctxt->html)) && (!xmlCtxtIsCatastrophicError(ctxt)))) { doc = ctxt->myDoc; } else { if (ctxt->errNo == XML_ERR_OK) xmlFatalErr(ctxt, XML_ERR_INTERNAL_ERROR, "unknown error"); doc = NULL; xmlFreeDoc(ctxt->myDoc); } ctxt->myDoc = NULL; return(doc); } /** * xmlCtxtIsHtml: * @ctxt: parser context * * Available since 2.14.0. * * Returns 1 if this is a HTML parser context, 0 otherwise. */ int xmlCtxtIsHtml(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(0); return(ctxt->html ? 1 : 0); } /** * xmlCtxtIsStopped: * @ctxt: parser context * * Available since 2.14.0. * * Returns 1 if the parser is stopped, 0 otherwise. */ int xmlCtxtIsStopped(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(0); return(PARSER_STOPPED(ctxt)); } #ifdef LIBXML_VALID_ENABLED /** * xmlCtxtGetValidCtxt: * @ctxt: parser context * * Available since 2.14.0. * * Returns the validation context. */ xmlValidCtxtPtr xmlCtxtGetValidCtxt(xmlParserCtxtPtr ctxt) { if (ctxt == NULL) return(NULL); return(&ctxt->vctxt); } #endif /************************************************************************ * * * Handling of node information * * * ************************************************************************/ /** * xmlClearParserCtxt: * @ctxt: an XML parser context * * Clear (release owned resources) and reinitialize a parser context */ void xmlClearParserCtxt(xmlParserCtxtPtr ctxt) { if (ctxt==NULL) return; xmlClearNodeInfoSeq(&ctxt->node_seq); xmlCtxtReset(ctxt); } /** * xmlParserFindNodeInfo: * @ctx: an XML parser context * @node: an XML node within the tree * * DEPRECATED: Don't use. * * Find the parser node info struct for a given node * * Returns an xmlParserNodeInfo block pointer or NULL */ const xmlParserNodeInfo * xmlParserFindNodeInfo(xmlParserCtxtPtr ctx, xmlNodePtr node) { unsigned long pos; if ((ctx == NULL) || (node == NULL)) return (NULL); /* Find position where node should be at */ pos = xmlParserFindNodeInfoIndex(&ctx->node_seq, node); if (pos < ctx->node_seq.length && ctx->node_seq.buffer[pos].node == node) return &ctx->node_seq.buffer[pos]; else return NULL; } /** * xmlInitNodeInfoSeq: * @seq: a node info sequence pointer * * DEPRECATED: Don't use. * * -- Initialize (set to initial state) node info sequence */ void xmlInitNodeInfoSeq(xmlParserNodeInfoSeqPtr seq) { if (seq == NULL) return; seq->length = 0; seq->maximum = 0; seq->buffer = NULL; } /** * xmlClearNodeInfoSeq: * @seq: a node info sequence pointer * * DEPRECATED: Don't use. * * -- Clear (release memory and reinitialize) node * info sequence */ void xmlClearNodeInfoSeq(xmlParserNodeInfoSeqPtr seq) { if (seq == NULL) return; if (seq->buffer != NULL) xmlFree(seq->buffer); xmlInitNodeInfoSeq(seq); } /** * xmlParserFindNodeInfoIndex: * @seq: a node info sequence pointer * @node: an XML node pointer * * DEPRECATED: Don't use. * * xmlParserFindNodeInfoIndex : Find the index that the info record for * the given node is or should be at in a sorted sequence * * Returns a long indicating the position of the record */ unsigned long xmlParserFindNodeInfoIndex(xmlParserNodeInfoSeqPtr seq, xmlNodePtr node) { unsigned long upper, lower, middle; int found = 0; if ((seq == NULL) || (node == NULL)) return ((unsigned long) -1); /* Do a binary search for the key */ lower = 1; upper = seq->length; middle = 0; while (lower <= upper && !found) { middle = lower + (upper - lower) / 2; if (node == seq->buffer[middle - 1].node) found = 1; else if (node < seq->buffer[middle - 1].node) upper = middle - 1; else lower = middle + 1; } /* Return position */ if (middle == 0 || seq->buffer[middle - 1].node < node) return middle; else return middle - 1; } /** * xmlParserAddNodeInfo: * @ctxt: an XML parser context * @info: a node info sequence pointer * * DEPRECATED: Don't use. * * Insert node info record into the sorted sequence */ void xmlParserAddNodeInfo(xmlParserCtxtPtr ctxt, xmlParserNodeInfoPtr info) { unsigned long pos; if ((ctxt == NULL) || (info == NULL)) return; /* Find pos and check to see if node is already in the sequence */ pos = xmlParserFindNodeInfoIndex(&ctxt->node_seq, (xmlNodePtr) info->node); if ((pos < ctxt->node_seq.length) && (ctxt->node_seq.buffer != NULL) && (ctxt->node_seq.buffer[pos].node == info->node)) { ctxt->node_seq.buffer[pos] = *info; } /* Otherwise, we need to add new node to buffer */ else { if (ctxt->node_seq.length + 1 > ctxt->node_seq.maximum) { xmlParserNodeInfo *tmp; int newSize; newSize = xmlGrowCapacity(ctxt->node_seq.maximum, sizeof(tmp[0]), 4, XML_MAX_ITEMS); if (newSize < 0) { xmlCtxtErrMemory(ctxt); return; } tmp = xmlRealloc(ctxt->node_seq.buffer, newSize * sizeof(tmp[0])); if (tmp == NULL) { xmlCtxtErrMemory(ctxt); return; } ctxt->node_seq.buffer = tmp; ctxt->node_seq.maximum = newSize; } /* If position is not at end, move elements out of the way */ if (pos != ctxt->node_seq.length) { unsigned long i; for (i = ctxt->node_seq.length; i > pos; i--) ctxt->node_seq.buffer[i] = ctxt->node_seq.buffer[i - 1]; } /* Copy element and increase length */ ctxt->node_seq.buffer[pos] = *info; ctxt->node_seq.length++; } } /************************************************************************ * * * Defaults settings * * * ************************************************************************/ /** * xmlPedanticParserDefault: * @val: int 0 or 1 * * DEPRECATED: Use the modern options API with XML_PARSE_PEDANTIC. * * Set and return the previous value for enabling pedantic warnings. * * Returns the last value for 0 for no substitution, 1 for substitution. */ int xmlPedanticParserDefault(int val) { int old = xmlPedanticParserDefaultValue; xmlPedanticParserDefaultValue = val; return(old); } /** * xmlLineNumbersDefault: * @val: int 0 or 1 * * DEPRECATED: The modern options API always enables line numbers. * * Set and return the previous value for enabling line numbers in elements * contents. This may break on old application and is turned off by default. * * Returns the last value for 0 for no substitution, 1 for substitution. */ int xmlLineNumbersDefault(int val) { int old = xmlLineNumbersDefaultValue; xmlLineNumbersDefaultValue = val; return(old); } /** * xmlSubstituteEntitiesDefault: * @val: int 0 or 1 * * DEPRECATED: Use the modern options API with XML_PARSE_NOENT. * * Set and return the previous value for default entity support. * Initially the parser always keep entity references instead of substituting * entity values in the output. This function has to be used to change the * default parser behavior * SAX::substituteEntities() has to be used for changing that on a file by * file basis. * * Returns the last value for 0 for no substitution, 1 for substitution. */ int xmlSubstituteEntitiesDefault(int val) { int old = xmlSubstituteEntitiesDefaultValue; xmlSubstituteEntitiesDefaultValue = val; return(old); } /** * xmlKeepBlanksDefault: * @val: int 0 or 1 * * DEPRECATED: Use the modern options API with XML_PARSE_NOBLANKS. * * Set and return the previous value for default blanks text nodes support. * The 1.x version of the parser used an heuristic to try to detect * ignorable white spaces. As a result the SAX callback was generating * xmlSAX2IgnorableWhitespace() callbacks instead of characters() one, and when * using the DOM output text nodes containing those blanks were not generated. * The 2.x and later version will switch to the XML standard way and * ignorableWhitespace() are only generated when running the parser in * validating mode and when the current element doesn't allow CDATA or * mixed content. * This function is provided as a way to force the standard behavior * on 1.X libs and to switch back to the old mode for compatibility when * running 1.X client code on 2.X . Upgrade of 1.X code should be done * by using xmlIsBlankNode() commodity function to detect the "empty" * nodes generated. * This value also affect autogeneration of indentation when saving code * if blanks sections are kept, indentation is not generated. * * Returns the last value for 0 for no substitution, 1 for substitution. */ int xmlKeepBlanksDefault(int val) { int old = xmlKeepBlanksDefaultValue; xmlKeepBlanksDefaultValue = val; #ifdef LIBXML_OUTPUT_ENABLED if (!val) xmlIndentTreeOutput = 1; #endif return(old); }