parserInternals.c

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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/valid.h>
#include <libxml/entities.h>
#include <libxml/xmlerror.h>
#include <libxml/encoding.h>
#include <libxml/valid.h>
#include <libxml/xmlIO.h>
#include <libxml/uri.h>
#include <libxml/dict.h>
#include <libxml/SAX.h>
#ifdef LIBXML_CATALOG_ENABLED
#include <libxml/catalog.h>
#endif
#include <libxml/globals.h>
#include <libxml/chvalid.h>
 
#define CUR(ctxt) ctxt->input->cur
#define END(ctxt) ctxt->input->end
#define VALID_CTXT(ctxt) (CUR(ctxt) <= END(ctxt))
 
#include "buf.h"
#include "enc.h"
 
/*
 * Various global defaults for parsing
 */
 
void
xmlCheckVersion(int version) {
    int myversion = (int) LIBXML_VERSION;
 
    xmlInitParser();
 
    if ((myversion / 10000) != (version / 10000)) {
    xmlGenericError(xmlGenericErrorContext,
        "Fatal: program compiled against libxml %d using libxml %d\n",
        (version / 10000), (myversion / 10000));
    fprintf(stderr,
        "Fatal: program compiled against libxml %d using libxml %d\n",
        (version / 10000), (myversion / 10000));
    }
    if ((myversion / 100) < (version / 100)) {
    xmlGenericError(xmlGenericErrorContext,
        "Warning: program compiled against libxml %d using older %d\n",
        (version / 100), (myversion / 100));
    }
}
 
 
/************************************************************************
 *                                  *
 *      Some factorized error routines              *
 *                                  *
 ************************************************************************/
 
 
void
xmlErrMemory(xmlParserCtxtPtr ctxt, const char *extra)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
    return;
    if (ctxt != NULL) {
        ctxt->errNo = XML_ERR_NO_MEMORY;
        ctxt->instate = XML_PARSER_EOF;
        ctxt->disableSAX = 1;
    }
    if (extra)
        __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER,
                        XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, extra,
                        NULL, NULL, 0, 0,
                        "Memory allocation failed : %s\n", extra);
    else
        __xmlRaiseError(NULL, NULL, NULL, ctxt, NULL, XML_FROM_PARSER,
                        XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, NULL,
                        NULL, NULL, 0, 0, "Memory allocation failed\n");
}
 
void
__xmlErrEncoding(xmlParserCtxtPtr ctxt, xmlParserErrors xmlerr,
                 const char *msg, const xmlChar * str1, const xmlChar * str2)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
    return;
    if (ctxt != NULL)
        ctxt->errNo = xmlerr;
    __xmlRaiseError(NULL, NULL, NULL,
                    ctxt, NULL, XML_FROM_PARSER, xmlerr, XML_ERR_FATAL,
                    NULL, 0, (const char *) str1, (const char *) str2,
                    NULL, 0, 0, msg, str1, str2);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}
 
static void LIBXML_ATTR_FORMAT(2,0)
xmlErrInternal(xmlParserCtxtPtr ctxt, const char *msg, const xmlChar * str)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
    return;
    if (ctxt != NULL)
        ctxt->errNo = XML_ERR_INTERNAL_ERROR;
    __xmlRaiseError(NULL, NULL, NULL,
                    ctxt, NULL, XML_FROM_PARSER, XML_ERR_INTERNAL_ERROR,
                    XML_ERR_FATAL, NULL, 0, (const char *) str, NULL, NULL,
                    0, 0, msg, str);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}
 
static void LIBXML_ATTR_FORMAT(3,0)
xmlErrEncodingInt(xmlParserCtxtPtr ctxt, xmlParserErrors error,
                  const char *msg, int val)
{
    if ((ctxt != NULL) && (ctxt->disableSAX != 0) &&
        (ctxt->instate == XML_PARSER_EOF))
    return;
    if (ctxt != NULL)
        ctxt->errNo = error;
    __xmlRaiseError(NULL, NULL, NULL,
                    ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
                    NULL, 0, NULL, NULL, NULL, val, 0, msg, val);
    if (ctxt != NULL) {
        ctxt->wellFormed = 0;
        if (ctxt->recovery == 0)
            ctxt->disableSAX = 1;
    }
}
 
int
xmlIsLetter(int c) {
    return(IS_BASECHAR(c) || IS_IDEOGRAPHIC(c));
}
 
/************************************************************************
 *                                  *
 *      Input handling functions for progressive parsing    *
 *                                  *
 ************************************************************************/
 
/* #define DEBUG_INPUT */
/* #define DEBUG_STACK */
/* #define DEBUG_PUSH */
 
 
/* we need to keep enough input to show errors in context */
#define LINE_LEN        80
 
#ifdef DEBUG_INPUT
#define CHECK_BUFFER(in) check_buffer(in)
 
static
void check_buffer(xmlParserInputPtr in) {
    if (in->base != xmlBufContent(in->buf->buffer)) {
        xmlGenericError(xmlGenericErrorContext,
        "xmlParserInput: base mismatch problem\n");
    }
    if (in->cur < in->base) {
        xmlGenericError(xmlGenericErrorContext,
        "xmlParserInput: cur < base problem\n");
    }
    if (in->cur > in->base + xmlBufUse(in->buf->buffer)) {
        xmlGenericError(xmlGenericErrorContext,
        "xmlParserInput: cur > base + use problem\n");
    }
    xmlGenericError(xmlGenericErrorContext,"buffer %x : content %x, cur %d, use %d\n",
            (int) in, (int) xmlBufContent(in->buf->buffer), in->cur - in->base,
        xmlBufUse(in->buf->buffer));
}
 
#else
#define CHECK_BUFFER(in)
#endif
 
 
int
xmlParserInputRead(xmlParserInputPtr in ATTRIBUTE_UNUSED, int len ATTRIBUTE_UNUSED) {
    return(-1);
}
 
int
xmlParserInputGrow(xmlParserInputPtr in, int len) {
    int ret;
    size_t indx;
 
    if ((in == NULL) || (len < 0)) return(-1);
#ifdef DEBUG_INPUT
    xmlGenericError(xmlGenericErrorContext, "Grow\n");
#endif
    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);
 
    CHECK_BUFFER(in);
 
    indx = in->cur - in->base;
    if (xmlBufUse(in->buf->buffer) > (unsigned int) indx + INPUT_CHUNK) {
 
    CHECK_BUFFER(in);
 
        return(0);
    }
    if (in->buf->readcallback != NULL) {
    ret = xmlParserInputBufferGrow(in->buf, len);
    } else
        return(0);
 
    in->base = xmlBufContent(in->buf->buffer);
    in->cur = in->base + indx;
    in->end = xmlBufEnd(in->buf->buffer);
 
    CHECK_BUFFER(in);
 
    return(ret);
}
 
void
xmlParserInputShrink(xmlParserInputPtr in) {
    size_t used;
    size_t ret;
 
#ifdef DEBUG_INPUT
    xmlGenericError(xmlGenericErrorContext, "Shrink\n");
#endif
    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;
 
    CHECK_BUFFER(in);
 
    used = in->cur - in->base;
    /*
     * Do not shrink on large buffers whose only a tiny fraction
     * was consumed
     */
    if (used > INPUT_CHUNK) {
    ret = xmlBufShrink(in->buf->buffer, used - LINE_LEN);
    if (ret > 0) {
            used -= ret;
        in->consumed += ret;
    }
    }
 
    if (xmlBufUse(in->buf->buffer) <= INPUT_CHUNK) {
        xmlParserInputBufferRead(in->buf, 2 * INPUT_CHUNK);
    }
 
    in->base = xmlBufContent(in->buf->buffer);
    in->cur = in->base + used;
    in->end = xmlBufEnd(in->buf->buffer);
 
    CHECK_BUFFER(in);
}
 
/************************************************************************
 *                                  *
 *      UTF8 character input and related functions      *
 *                                  *
 ************************************************************************/
 
void
xmlNextChar(xmlParserCtxtPtr ctxt)
{
    if ((ctxt == NULL) || (ctxt->instate == XML_PARSER_EOF) ||
        (ctxt->input == NULL))
        return;
 
    if (!(VALID_CTXT(ctxt))) {
        xmlErrInternal(ctxt, "Parser input data memory error\n", NULL);
    ctxt->errNo = XML_ERR_INTERNAL_ERROR;
        xmlStopParser(ctxt);
    return;
    }
 
    if ((*ctxt->input->cur == 0) &&
        (xmlParserInputGrow(ctxt->input, INPUT_CHUNK) <= 0)) {
        return;
    }
 
    if (ctxt->charset == XML_CHAR_ENCODING_UTF8) {
        const unsigned char *cur;
        unsigned char c;
 
        /*
         *   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 (*(ctxt->input->cur) == '\n') {
            ctxt->input->line++; ctxt->input->col = 1;
        } else
            ctxt->input->col++;
 
        /*
         * 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
         *
         * Check for the 0x110000 limit too
         */
        cur = ctxt->input->cur;
 
        c = *cur;
        if (c & 0x80) {
            if (c == 0xC0)
            goto encoding_error;
            if (cur[1] == 0) {
                xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
                cur = ctxt->input->cur;
            }
            if ((cur[1] & 0xc0) != 0x80)
                goto encoding_error;
            if ((c & 0xe0) == 0xe0) {
                unsigned int val;
 
                if (cur[2] == 0) {
                    xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
                    cur = ctxt->input->cur;
                }
                if ((cur[2] & 0xc0) != 0x80)
                    goto encoding_error;
                if ((c & 0xf0) == 0xf0) {
                    if (cur[3] == 0) {
                        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
                        cur = ctxt->input->cur;
                    }
                    if (((c & 0xf8) != 0xf0) ||
                        ((cur[3] & 0xc0) != 0x80))
                        goto encoding_error;
                    /* 4-byte code */
                    ctxt->input->cur += 4;
                    val = (cur[0] & 0x7) << 18;
                    val |= (cur[1] & 0x3f) << 12;
                    val |= (cur[2] & 0x3f) << 6;
                    val |= cur[3] & 0x3f;
                } else {
                    /* 3-byte code */
                    ctxt->input->cur += 3;
                    val = (cur[0] & 0xf) << 12;
                    val |= (cur[1] & 0x3f) << 6;
                    val |= cur[2] & 0x3f;
                }
                if (((val > 0xd7ff) && (val < 0xe000)) ||
                    ((val > 0xfffd) && (val < 0x10000)) ||
                    (val >= 0x110000)) {
        xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
                  "Char 0x%X out of allowed range\n",
                  val);
                }
            } else
                /* 2-byte code */
                ctxt->input->cur += 2;
        } else
            /* 1-byte code */
            ctxt->input->cur++;
    } else {
        /*
         * Assume it's a fixed length encoding (1) with
         * a compatible encoding for the ASCII set, since
         * XML constructs only use < 128 chars
         */
 
        if (*(ctxt->input->cur) == '\n') {
            ctxt->input->line++; ctxt->input->col = 1;
        } else
            ctxt->input->col++;
        ctxt->input->cur++;
    }
    if (*ctxt->input->cur == 0)
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
    return;
encoding_error:
    /*
     * If we detect an UTF8 error that probably mean that the
     * input encoding didn't get properly advertised in the
     * declaration header. Report the error and switch the encoding
     * to ISO-Latin-1 (if you don't like this policy, just declare the
     * encoding !)
     */
    if ((ctxt == NULL) || (ctxt->input == NULL) ||
        (ctxt->input->end - ctxt->input->cur < 4)) {
    __xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
             "Input is not proper UTF-8, indicate encoding !\n",
             NULL, NULL);
    } else {
        char buffer[150];
 
    snprintf(buffer, 149, "Bytes: 0x%02X 0x%02X 0x%02X 0x%02X\n",
            ctxt->input->cur[0], ctxt->input->cur[1],
            ctxt->input->cur[2], ctxt->input->cur[3]);
    __xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
             "Input is not proper UTF-8, indicate encoding !\n%s",
             BAD_CAST buffer, NULL);
    }
    ctxt->charset = XML_CHAR_ENCODING_8859_1;
    ctxt->input->cur++;
    return;
}
 
int
xmlCurrentChar(xmlParserCtxtPtr ctxt, int *len) {
    if ((ctxt == NULL) || (len == NULL) || (ctxt->input == NULL)) return(0);
    if (ctxt->instate == XML_PARSER_EOF)
    return(0);
 
    if ((*ctxt->input->cur >= 0x20) && (*ctxt->input->cur <= 0x7F)) {
        *len = 1;
        return((int) *ctxt->input->cur);
    }
    if (ctxt->charset == XML_CHAR_ENCODING_UTF8) {
    /*
     * 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
     *
     * Check for the 0x110000 limit too
     */
    const unsigned char *cur = ctxt->input->cur;
    unsigned char c;
    unsigned int val;
 
    c = *cur;
    if (c & 0x80) {
        if (((c & 0x40) == 0) || (c == 0xC0))
        goto encoding_error;
        if (cur[1] == 0) {
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
                cur = ctxt->input->cur;
            }
        if ((cur[1] & 0xc0) != 0x80)
        goto encoding_error;
        if ((c & 0xe0) == 0xe0) {
        if (cur[2] == 0) {
            xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
                    cur = ctxt->input->cur;
                }
        if ((cur[2] & 0xc0) != 0x80)
            goto encoding_error;
        if ((c & 0xf0) == 0xf0) {
            if (cur[3] == 0) {
            xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
                        cur = ctxt->input->cur;
                    }
            if (((c & 0xf8) != 0xf0) ||
            ((cur[3] & 0xc0) != 0x80))
            goto encoding_error;
            /* 4-byte code */
            *len = 4;
            val = (cur[0] & 0x7) << 18;
            val |= (cur[1] & 0x3f) << 12;
            val |= (cur[2] & 0x3f) << 6;
            val |= cur[3] & 0x3f;
            if (val < 0x10000)
            goto encoding_error;
        } else {
          /* 3-byte code */
            *len = 3;
            val = (cur[0] & 0xf) << 12;
            val |= (cur[1] & 0x3f) << 6;
            val |= cur[2] & 0x3f;
            if (val < 0x800)
            goto encoding_error;
        }
        } else {
          /* 2-byte code */
        *len = 2;
        val = (cur[0] & 0x1f) << 6;
        val |= cur[1] & 0x3f;
        if (val < 0x80)
            goto encoding_error;
        }
        if (!IS_CHAR(val)) {
            xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
                  "Char 0x%X out of allowed range\n", val);
        }
        return(val);
    } else {
        /* 1-byte code */
        *len = 1;
        if (*ctxt->input->cur == 0)
        xmlParserInputGrow(ctxt->input, INPUT_CHUNK);
        if ((*ctxt->input->cur == 0) &&
            (ctxt->input->end > ctxt->input->cur)) {
            xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
                  "Char 0x0 out of allowed range\n", 0);
        }
        if (*ctxt->input->cur == 0xD) {
        if (ctxt->input->cur[1] == 0xA) {
            ctxt->input->cur++;
        }
        return(0xA);
        }
        return((int) *ctxt->input->cur);
    }
    }
    /*
     * Assume it's a fixed length encoding (1) with
     * a compatible encoding for the ASCII set, since
     * XML constructs only use < 128 chars
     */
    *len = 1;
    if (*ctxt->input->cur == 0xD) {
    if (ctxt->input->cur[1] == 0xA) {
        ctxt->input->cur++;
    }
    return(0xA);
    }
    return((int) *ctxt->input->cur);
encoding_error:
    /*
     * 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 to indicate an end of stream problem
     */
    if (ctxt->input->end - ctxt->input->cur < 4) {
    *len = 0;
    return(0);
    }
 
    /*
     * If we detect an UTF8 error that probably mean that the
     * input encoding didn't get properly advertised in the
     * declaration header. Report the error and switch the encoding
     * to ISO-Latin-1 (if you don't like this policy, just declare the
     * encoding !)
     */
    {
        char buffer[150];
 
    snprintf(&buffer[0], 149, "Bytes: 0x%02X 0x%02X 0x%02X 0x%02X\n",
            ctxt->input->cur[0], ctxt->input->cur[1],
            ctxt->input->cur[2], ctxt->input->cur[3]);
    __xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
             "Input is not proper UTF-8, indicate encoding !\n%s",
             BAD_CAST buffer, NULL);
    }
    ctxt->charset = XML_CHAR_ENCODING_8859_1;
    *len = 1;
    return((int) *ctxt->input->cur);
}
 
int
xmlStringCurrentChar(xmlParserCtxtPtr ctxt, const xmlChar * cur, int *len)
{
    if ((len == NULL) || (cur == NULL)) return(0);
    if ((ctxt == NULL) || (ctxt->charset == XML_CHAR_ENCODING_UTF8)) {
        /*
         * 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
         *
         * Check for the 0x110000 limit too
         */
        unsigned char c;
        unsigned int val;
 
        c = *cur;
        if (c & 0x80) {
            if ((cur[1] & 0xc0) != 0x80)
                goto encoding_error;
            if ((c & 0xe0) == 0xe0) {
 
                if ((cur[2] & 0xc0) != 0x80)
                    goto encoding_error;
                if ((c & 0xf0) == 0xf0) {
                    if (((c & 0xf8) != 0xf0) || ((cur[3] & 0xc0) != 0x80))
                        goto encoding_error;
                    /* 4-byte code */
                    *len = 4;
                    val = (cur[0] & 0x7) << 18;
                    val |= (cur[1] & 0x3f) << 12;
                    val |= (cur[2] & 0x3f) << 6;
                    val |= cur[3] & 0x3f;
                } else {
                    /* 3-byte code */
                    *len = 3;
                    val = (cur[0] & 0xf) << 12;
                    val |= (cur[1] & 0x3f) << 6;
                    val |= cur[2] & 0x3f;
                }
            } else {
                /* 2-byte code */
                *len = 2;
                val = (cur[0] & 0x1f) << 6;
                val |= cur[1] & 0x3f;
            }
            if (!IS_CHAR(val)) {
            xmlErrEncodingInt(ctxt, XML_ERR_INVALID_CHAR,
                  "Char 0x%X out of allowed range\n", val);
            }
            return (val);
        } else {
            /* 1-byte code */
            *len = 1;
            return ((int) *cur);
        }
    }
    /*
     * Assume it's a fixed length encoding (1) with
     * a compatible encoding for the ASCII set, since
     * XML constructs only use < 128 chars
     */
    *len = 1;
    return ((int) *cur);
encoding_error:
 
    /*
     * 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 to indicate an end of stream problem
     */
    if ((ctxt == NULL) || (ctxt->input == NULL) ||
        (ctxt->input->end - ctxt->input->cur < 4)) {
    *len = 0;
    return(0);
    }
    /*
     * If we detect an UTF8 error that probably mean that the
     * input encoding didn't get properly advertised in the
     * declaration header. Report the error and switch the encoding
     * to ISO-Latin-1 (if you don't like this policy, just declare the
     * encoding !)
     */
    {
        char buffer[150];
 
    snprintf(buffer, 149, "Bytes: 0x%02X 0x%02X 0x%02X 0x%02X\n",
            ctxt->input->cur[0], ctxt->input->cur[1],
            ctxt->input->cur[2], ctxt->input->cur[3]);
    __xmlErrEncoding(ctxt, XML_ERR_INVALID_CHAR,
             "Input is not proper UTF-8, indicate encoding !\n%s",
             BAD_CAST buffer, NULL);
    }
    *len = 1;
    return ((int) *cur);
}
 
int
xmlCopyCharMultiByte(xmlChar *out, int val) {
    if (out == NULL) 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 {
        xmlErrEncodingInt(NULL, XML_ERR_INVALID_CHAR,
            "Internal error, xmlCopyCharMultiByte 0x%X out of bound\n",
                  val);
        return(0);
    }
    for ( ; bits >= 0; bits-= 6)
        *out++= ((val >> bits) & 0x3F) | 0x80 ;
    return (out - savedout);
    }
    *out = (xmlChar) val;
    return 1;
}
 
int
xmlCopyChar(int len ATTRIBUTE_UNUSED, xmlChar *out, int val) {
    if (out == NULL) return(0);
    /* the len parameter is ignored */
    if  (val >= 0x80) {
    return(xmlCopyCharMultiByte (out, val));
    }
    *out = (xmlChar) val;
    return 1;
}
 
/************************************************************************
 *                                  *
 *      Commodity functions to switch encodings         *
 *                                  *
 ************************************************************************/
 
static int
xmlSwitchInputEncodingInt(xmlParserCtxtPtr ctxt, xmlParserInputPtr input,
                          xmlCharEncodingHandlerPtr handler, int len);
int
xmlSwitchEncoding(xmlParserCtxtPtr ctxt, xmlCharEncoding enc)
{
    xmlCharEncodingHandlerPtr handler;
    int len = -1;
    int ret;
 
    if (ctxt == NULL) return(-1);
    switch (enc) {
    case XML_CHAR_ENCODING_ERROR:
        __xmlErrEncoding(ctxt, XML_ERR_UNKNOWN_ENCODING,
                       "encoding unknown\n", NULL, NULL);
        return(-1);
    case XML_CHAR_ENCODING_NONE:
        /* let's assume it's UTF-8 without the XML decl */
        ctxt->charset = XML_CHAR_ENCODING_UTF8;
        return(0);
    case XML_CHAR_ENCODING_UTF8:
        /* default encoding, no conversion should be needed */
        ctxt->charset = XML_CHAR_ENCODING_UTF8;
 
        /*
         * Errata on XML-1.0 June 20 2001
         * Specific handling of the Byte Order Mark for
         * UTF-8
         */
        if ((ctxt->input != NULL) &&
        (ctxt->input->cur[0] == 0xEF) &&
        (ctxt->input->cur[1] == 0xBB) &&
        (ctxt->input->cur[2] == 0xBF)) {
        ctxt->input->cur += 3;
        }
        return(0);
    case XML_CHAR_ENCODING_UTF16LE:
    case XML_CHAR_ENCODING_UTF16BE:
        /*The raw input characters are encoded
         *in UTF-16. As we expect this function
         *to be called after xmlCharEncInFunc, we expect
         *ctxt->input->cur to contain UTF-8 encoded characters.
         *So the raw UTF16 Byte Order Mark
         *has also been converted into
         *an UTF-8 BOM. Let's skip that BOM.
         */
        if ((ctxt->input != NULL) && (ctxt->input->cur != NULL) &&
            (ctxt->input->cur[0] == 0xEF) &&
            (ctxt->input->cur[1] == 0xBB) &&
            (ctxt->input->cur[2] == 0xBF)) {
            ctxt->input->cur += 3;
        }
        len = 90;
    break;
    case XML_CHAR_ENCODING_UCS2:
        len = 90;
    break;
    case XML_CHAR_ENCODING_UCS4BE:
    case XML_CHAR_ENCODING_UCS4LE:
    case XML_CHAR_ENCODING_UCS4_2143:
    case XML_CHAR_ENCODING_UCS4_3412:
        len = 180;
    break;
    case XML_CHAR_ENCODING_EBCDIC:
    case XML_CHAR_ENCODING_8859_1:
    case XML_CHAR_ENCODING_8859_2:
    case XML_CHAR_ENCODING_8859_3:
    case XML_CHAR_ENCODING_8859_4:
    case XML_CHAR_ENCODING_8859_5:
    case XML_CHAR_ENCODING_8859_6:
    case XML_CHAR_ENCODING_8859_7:
    case XML_CHAR_ENCODING_8859_8:
    case XML_CHAR_ENCODING_8859_9:
    case XML_CHAR_ENCODING_ASCII:
    case XML_CHAR_ENCODING_2022_JP:
    case XML_CHAR_ENCODING_SHIFT_JIS:
    case XML_CHAR_ENCODING_EUC_JP:
        len = 45;
    break;
    }
    handler = xmlGetCharEncodingHandler(enc);
    if (handler == NULL) {
    /*
     * Default handlers.
     */
    switch (enc) {
        case XML_CHAR_ENCODING_ASCII:
        /* default encoding, no conversion should be needed */
        ctxt->charset = XML_CHAR_ENCODING_UTF8;
        return(0);
        case XML_CHAR_ENCODING_8859_1:
        if ((ctxt->inputNr == 1) &&
            (ctxt->encoding == NULL) &&
            (ctxt->input != NULL) &&
            (ctxt->input->encoding != NULL)) {
            ctxt->encoding = xmlStrdup(ctxt->input->encoding);
        }
        ctxt->charset = enc;
        return(0);
        default:
        __xmlErrEncoding(ctxt, XML_ERR_UNSUPPORTED_ENCODING,
                        "encoding not supported: %s\n",
            BAD_CAST xmlGetCharEncodingName(enc), NULL);
                /*
                 * TODO: We could recover from errors in external entities
                 * if we didn't stop the parser. But most callers of this
                 * function don't check the return value.
                 */
                xmlStopParser(ctxt);
                return(-1);
        }
    }
    ret = xmlSwitchInputEncodingInt(ctxt, ctxt->input, handler, len);
    if ((ret < 0) || (ctxt->errNo == XML_I18N_CONV_FAILED)) {
        /*
     * on encoding conversion errors, stop the parser
     */
        xmlStopParser(ctxt);
    ctxt->errNo = XML_I18N_CONV_FAILED;
    }
    return(ret);
}
 
static int
xmlSwitchInputEncodingInt(xmlParserCtxtPtr ctxt, xmlParserInputPtr input,
                          xmlCharEncodingHandlerPtr handler, int len)
{
    int nbchars;
 
    if (handler == NULL)
        return (-1);
    if (input == NULL)
        return (-1);
    if (input->buf != NULL) {
    ctxt->charset = XML_CHAR_ENCODING_UTF8;
 
        if (input->buf->encoder != NULL) {
            /*
             * Check in case the auto encoding detection triggered
             * in already.
             */
            if (input->buf->encoder == handler)
                return (0);
 
            /*
             * "UTF-16" can be used for both LE and BE
             if ((!xmlStrncmp(BAD_CAST input->buf->encoder->name,
             BAD_CAST "UTF-16", 6)) &&
             (!xmlStrncmp(BAD_CAST handler->name,
             BAD_CAST "UTF-16", 6))) {
             return(0);
             }
             */
 
            /*
             * Note: this is a bit dangerous, but that's what it
             * takes to use nearly compatible signature for different
             * encodings.
             *
             * FIXME: Encoders might buffer partial byte sequences, so
             * this probably can't work. We should return an error and
             * make sure that callers never try to switch the encoding
             * twice.
             */
            xmlCharEncCloseFunc(input->buf->encoder);
            input->buf->encoder = handler;
            return (0);
        }
        input->buf->encoder = handler;
 
        /*
         * Is there already some content down the pipe to convert ?
         */
        if (xmlBufIsEmpty(input->buf->buffer) == 0) {
            int processed;
        unsigned int use;
 
            /*
             * Specific handling of the Byte Order Mark for
             * UTF-16
             */
            if ((handler->name != NULL) &&
                (!strcmp(handler->name, "UTF-16LE") ||
                 !strcmp(handler->name, "UTF-16")) &&
                (input->cur[0] == 0xFF) && (input->cur[1] == 0xFE)) {
                input->cur += 2;
            }
            if ((handler->name != NULL) &&
                (!strcmp(handler->name, "UTF-16BE")) &&
                (input->cur[0] == 0xFE) && (input->cur[1] == 0xFF)) {
                input->cur += 2;
            }
            /*
             * Errata on XML-1.0 June 20 2001
             * Specific handling of the Byte Order Mark for
             * UTF-8
             */
            if ((handler->name != NULL) &&
                (!strcmp(handler->name, "UTF-8")) &&
                (input->cur[0] == 0xEF) &&
                (input->cur[1] == 0xBB) && (input->cur[2] == 0xBF)) {
                input->cur += 3;
            }
 
            /*
             * Shrink the current input buffer.
             * Move it as the raw buffer and create a new input buffer
             */
            processed = input->cur - input->base;
            xmlBufShrink(input->buf->buffer, processed);
            input->buf->raw = input->buf->buffer;
            input->buf->buffer = xmlBufCreate();
        input->buf->rawconsumed = processed;
        use = xmlBufUse(input->buf->raw);
 
            if (ctxt->html) {
                /*
                 * convert as much as possible of the buffer
                 */
                nbchars = xmlCharEncInput(input->buf, 1);
            } else {
                /*
                 * convert just enough to get
                 * '<?xml version="1.0" encoding="xxx"?>'
                 * parsed with the autodetected encoding
                 * into the parser reading buffer.
                 */
                nbchars = xmlCharEncFirstLineInput(input->buf, len);
            }
            xmlBufResetInput(input->buf->buffer, input);
            if (nbchars < 0) {
                xmlErrInternal(ctxt,
                               "switching encoding: encoder error\n",
                               NULL);
                return (-1);
            }
        input->buf->rawconsumed += use - xmlBufUse(input->buf->raw);
        }
        return (0);
    } else {
    xmlErrInternal(ctxt,
                "static memory buffer doesn't support encoding\n", NULL);
        /*
         * Callers assume that the input buffer takes ownership of the
         * encoding handler. xmlCharEncCloseFunc frees unregistered
         * handlers and avoids a memory leak.
         */
        xmlCharEncCloseFunc(handler);
    return (-1);
    }
}
 
int
xmlSwitchInputEncoding(xmlParserCtxtPtr ctxt, xmlParserInputPtr input,
                          xmlCharEncodingHandlerPtr handler) {
    return(xmlSwitchInputEncodingInt(ctxt, input, handler, -1));
}
 
int
xmlSwitchToEncoding(xmlParserCtxtPtr ctxt, xmlCharEncodingHandlerPtr handler)
{
    if (ctxt == NULL)
        return(-1);
    return(xmlSwitchInputEncodingInt(ctxt, ctxt->input, handler, -1));
}
 
/************************************************************************
 *                                  *
 *  Commodity functions to handle entities processing       *
 *                                  *
 ************************************************************************/
 
void
xmlFreeInputStream(xmlParserInputPtr input) {
    if (input == NULL) return;
 
    if (input->filename != NULL) xmlFree((char *) input->filename);
    if (input->directory != NULL) xmlFree((char *) input->directory);
    if (input->encoding != NULL) xmlFree((char *) input->encoding);
    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);
}
 
xmlParserInputPtr
xmlNewInputStream(xmlParserCtxtPtr ctxt) {
    xmlParserInputPtr input;
 
    input = (xmlParserInputPtr) xmlMalloc(sizeof(xmlParserInput));
    if (input == NULL) {
        xmlErrMemory(ctxt,  "couldn't allocate a new input stream\n");
    return(NULL);
    }
    memset(input, 0, sizeof(xmlParserInput));
    input->line = 1;
    input->col = 1;
    input->standalone = -1;
 
    /*
     * If the context is NULL the id cannot be initialized, but that
     * should not happen while parsing which is the situation where
     * the id is actually needed.
     */
    if (ctxt != NULL)
        input->id = ctxt->input_id++;
 
    return(input);
}
 
xmlParserInputPtr
xmlNewIOInputStream(xmlParserCtxtPtr ctxt, xmlParserInputBufferPtr input,
                xmlCharEncoding enc) {
    xmlParserInputPtr inputStream;
 
    if (input == NULL) return(NULL);
    if (xmlParserDebugEntities)
    xmlGenericError(xmlGenericErrorContext, "new input from I/O\n");
    inputStream = xmlNewInputStream(ctxt);
    if (inputStream == NULL) {
    return(NULL);
    }
    inputStream->filename = NULL;
    inputStream->buf = input;
    xmlBufResetInput(inputStream->buf->buffer, inputStream);
 
    if (enc != XML_CHAR_ENCODING_NONE) {
        xmlSwitchEncoding(ctxt, enc);
    }
 
    return(inputStream);
}
 
xmlParserInputPtr
xmlNewEntityInputStream(xmlParserCtxtPtr ctxt, xmlEntityPtr entity) {
    xmlParserInputPtr input;
 
    if (entity == NULL) {
        xmlErrInternal(ctxt, "xmlNewEntityInputStream entity = NULL\n",
                   NULL);
    return(NULL);
    }
    if (xmlParserDebugEntities)
    xmlGenericError(xmlGenericErrorContext,
        "new input from entity: %s\n", entity->name);
    if (entity->content == NULL) {
    switch (entity->etype) {
            case XML_EXTERNAL_GENERAL_UNPARSED_ENTITY:
            xmlErrInternal(ctxt, "Cannot parse entity %s\n",
                       entity->name);
                break;
            case XML_EXTERNAL_GENERAL_PARSED_ENTITY:
            case XML_EXTERNAL_PARAMETER_ENTITY:
        return(xmlLoadExternalEntity((char *) entity->URI,
               (char *) entity->ExternalID, ctxt));
            case XML_INTERNAL_GENERAL_ENTITY:
            xmlErrInternal(ctxt,
              "Internal entity %s without content !\n",
                       entity->name);
                break;
            case XML_INTERNAL_PARAMETER_ENTITY:
            xmlErrInternal(ctxt,
              "Internal parameter entity %s without content !\n",
                       entity->name);
                break;
            case XML_INTERNAL_PREDEFINED_ENTITY:
            xmlErrInternal(ctxt,
              "Predefined entity %s without content !\n",
                       entity->name);
                break;
    }
    return(NULL);
    }
    input = xmlNewInputStream(ctxt);
    if (input == NULL) {
    return(NULL);
    }
    if (entity->URI != NULL)
    input->filename = (char *) xmlStrdup((xmlChar *) entity->URI);
    input->base = entity->content;
    if (entity->length == 0)
        entity->length = xmlStrlen(entity->content);
    input->cur = entity->content;
    input->length = entity->length;
    input->end = &entity->content[input->length];
    return(input);
}
 
xmlParserInputPtr
xmlNewStringInputStream(xmlParserCtxtPtr ctxt, const xmlChar *buffer) {
    xmlParserInputPtr input;
 
    if (buffer == NULL) {
        xmlErrInternal(ctxt, "xmlNewStringInputStream string = NULL\n",
                   NULL);
    return(NULL);
    }
    if (xmlParserDebugEntities)
    xmlGenericError(xmlGenericErrorContext,
        "new fixed input: %.30s\n", buffer);
    input = xmlNewInputStream(ctxt);
    if (input == NULL) {
        xmlErrMemory(ctxt,  "couldn't allocate a new input stream\n");
    return(NULL);
    }
    input->base = buffer;
    input->cur = buffer;
    input->length = xmlStrlen(buffer);
    input->end = &buffer[input->length];
    return(input);
}
 
xmlParserInputPtr
xmlNewInputFromFile(xmlParserCtxtPtr ctxt, const char *filename) {
    xmlParserInputBufferPtr buf;
    xmlParserInputPtr inputStream;
    char *directory = NULL;
    xmlChar *URI = NULL;
 
    if (xmlParserDebugEntities)
    xmlGenericError(xmlGenericErrorContext,
        "new input from file: %s\n", filename);
    if (ctxt == NULL) return(NULL);
    buf = xmlParserInputBufferCreateFilename(filename, XML_CHAR_ENCODING_NONE);
    if (buf == NULL) {
    if (filename == NULL)
        __xmlLoaderErr(ctxt,
                       "failed to load external entity: NULL filename \n",
               NULL);
    else
        __xmlLoaderErr(ctxt, "failed to load external entity \"%s\"\n",
               (const char *) filename);
    return(NULL);
    }
 
    inputStream = xmlNewInputStream(ctxt);
    if (inputStream == NULL) {
    xmlFreeParserInputBuffer(buf);
    return(NULL);
    }
 
    inputStream->buf = buf;
    inputStream = xmlCheckHTTPInput(ctxt, inputStream);
    if (inputStream == NULL)
        return(NULL);
 
    if (inputStream->filename == NULL)
    URI = xmlStrdup((xmlChar *) filename);
    else
    URI = xmlStrdup((xmlChar *) inputStream->filename);
    directory = xmlParserGetDirectory((const char *) URI);
    if (inputStream->filename != NULL) xmlFree((char *)inputStream->filename);
    inputStream->filename = (char *) xmlCanonicPath((const xmlChar *) URI);
    if (URI != NULL) xmlFree((char *) URI);
    inputStream->directory = directory;
 
    xmlBufResetInput(inputStream->buf->buffer, inputStream);
    if ((ctxt->directory == NULL) && (directory != NULL))
        ctxt->directory = (char *) xmlStrdup((const xmlChar *) directory);
    return(inputStream);
}
 
/************************************************************************
 *                                  *
 *      Commodity functions to handle parser contexts       *
 *                                  *
 ************************************************************************/
 
int
xmlInitParserCtxt(xmlParserCtxtPtr ctxt)
{
    xmlParserInputPtr input;
 
    if(ctxt==NULL) {
        xmlErrInternal(NULL, "Got NULL parser context\n", NULL);
        return(-1);
    }
 
    xmlInitParser();
 
    if (ctxt->dict == NULL)
    ctxt->dict = xmlDictCreate();
    if (ctxt->dict == NULL) {
        xmlErrMemory(NULL, "cannot initialize parser context\n");
    return(-1);
    }
    xmlDictSetLimit(ctxt->dict, XML_MAX_DICTIONARY_LIMIT);
 
    if (ctxt->sax == NULL)
    ctxt->sax = (xmlSAXHandler *) xmlMalloc(sizeof(xmlSAXHandler));
    if (ctxt->sax == NULL) {
        xmlErrMemory(NULL, "cannot initialize parser context\n");
    return(-1);
    }
    else
        xmlSAXVersion(ctxt->sax, 2);
 
    ctxt->maxatts = 0;
    ctxt->atts = NULL;
    /* Allocate the Input stack */
    if (ctxt->inputTab == NULL) {
    ctxt->inputTab = (xmlParserInputPtr *)
            xmlMalloc(5 * sizeof(xmlParserInputPtr));
    ctxt->inputMax = 5;
    }
    if (ctxt->inputTab == NULL) {
        xmlErrMemory(NULL, "cannot initialize parser context\n");
    ctxt->inputNr = 0;
    ctxt->inputMax = 0;
    ctxt->input = NULL;
    return(-1);
    }
    while ((input = inputPop(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->external = 0;
    ctxt->instate = XML_PARSER_START;
    ctxt->token = 0;
    ctxt->directory = NULL;
 
    /* Allocate the Node stack */
    if (ctxt->nodeTab == NULL) {
    ctxt->nodeTab = (xmlNodePtr *) xmlMalloc(10 * sizeof(xmlNodePtr));
    ctxt->nodeMax = 10;
    }
    if (ctxt->nodeTab == NULL) {
        xmlErrMemory(NULL, "cannot initialize parser context\n");
    ctxt->nodeNr = 0;
    ctxt->nodeMax = 0;
    ctxt->node = NULL;
    ctxt->inputNr = 0;
    ctxt->inputMax = 0;
    ctxt->input = NULL;
    return(-1);
    }
    ctxt->nodeNr = 0;
    ctxt->node = NULL;
 
    /* Allocate the Name stack */
    if (ctxt->nameTab == NULL) {
    ctxt->nameTab = (const xmlChar **) xmlMalloc(10 * sizeof(xmlChar *));
    ctxt->nameMax = 10;
    }
    if (ctxt->nameTab == NULL) {
        xmlErrMemory(NULL, "cannot initialize parser context\n");
    ctxt->nodeNr = 0;
    ctxt->nodeMax = 0;
    ctxt->node = NULL;
    ctxt->inputNr = 0;
    ctxt->inputMax = 0;
    ctxt->input = NULL;
    ctxt->nameNr = 0;
    ctxt->nameMax = 0;
    ctxt->name = NULL;
    return(-1);
    }
    ctxt->nameNr = 0;
    ctxt->name = NULL;
 
    /* Allocate the space stack */
    if (ctxt->spaceTab == NULL) {
    ctxt->spaceTab = (int *) xmlMalloc(10 * sizeof(int));
    ctxt->spaceMax = 10;
    }
    if (ctxt->spaceTab == NULL) {
        xmlErrMemory(NULL, "cannot initialize parser context\n");
    ctxt->nodeNr = 0;
    ctxt->nodeMax = 0;
    ctxt->node = NULL;
    ctxt->inputNr = 0;
    ctxt->inputMax = 0;
    ctxt->input = NULL;
    ctxt->nameNr = 0;
    ctxt->nameMax = 0;
    ctxt->name = NULL;
    ctxt->spaceNr = 0;
    ctxt->spaceMax = 0;
    ctxt->space = NULL;
    return(-1);
    }
    ctxt->spaceNr = 1;
    ctxt->spaceMax = 10;
    ctxt->spaceTab[0] = -1;
    ctxt->space = &ctxt->spaceTab[0];
    ctxt->userData = ctxt;
    ctxt->myDoc = NULL;
    ctxt->wellFormed = 1;
    ctxt->nsWellFormed = 1;
    ctxt->valid = 1;
    ctxt->loadsubset = xmlLoadExtDtdDefaultValue;
    if (ctxt->loadsubset) {
        ctxt->options |= XML_PARSE_DTDLOAD;
    }
    ctxt->validate = xmlDoValidityCheckingDefaultValue;
    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->vctxt.flags = XML_VCTXT_USE_PCTXT;
    ctxt->vctxt.userData = ctxt;
    ctxt->vctxt.error = xmlParserValidityError;
    ctxt->vctxt.warning = xmlParserValidityWarning;
    if (ctxt->validate) {
    if (xmlGetWarningsDefaultValue == 0)
        ctxt->vctxt.warning = NULL;
    else
        ctxt->vctxt.warning = xmlParserValidityWarning;
    ctxt->vctxt.nodeMax = 0;
        ctxt->options |= XML_PARSE_DTDVALID;
    }
    ctxt->replaceEntities = xmlSubstituteEntitiesDefaultValue;
    if (ctxt->replaceEntities) {
        ctxt->options |= XML_PARSE_NOENT;
    }
    ctxt->record_info = 0;
    ctxt->checkIndex = 0;
    ctxt->inSubset = 0;
    ctxt->errNo = XML_ERR_OK;
    ctxt->depth = 0;
    ctxt->charset = XML_CHAR_ENCODING_UTF8;
    ctxt->catalogs = NULL;
    ctxt->nbentities = 0;
    ctxt->sizeentities = 0;
    ctxt->sizeentcopy = 0;
    ctxt->input_id = 1;
    xmlInitNodeInfoSeq(&ctxt->node_seq);
    return(0);
}
 
void
xmlFreeParserCtxt(xmlParserCtxtPtr ctxt)
{
    xmlParserInputPtr input;
 
    if (ctxt == NULL) return;
 
    while ((input = inputPop(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((char *) 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((char *) ctxt->nsTab);
    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);
}
 
xmlParserCtxtPtr
xmlNewParserCtxt(void)
{
    xmlParserCtxtPtr ctxt;
 
    ctxt = (xmlParserCtxtPtr) xmlMalloc(sizeof(xmlParserCtxt));
    if (ctxt == NULL) {
    xmlErrMemory(NULL, "cannot allocate parser context\n");
    return(NULL);
    }
    memset(ctxt, 0, sizeof(xmlParserCtxt));
    if (xmlInitParserCtxt(ctxt) < 0) {
        xmlFreeParserCtxt(ctxt);
    return(NULL);
    }
    return(ctxt);
}
 
/************************************************************************
 *                                  *
 *      Handling of node information                *
 *                                  *
 ************************************************************************/
 
void
xmlClearParserCtxt(xmlParserCtxtPtr ctxt)
{
  if (ctxt==NULL)
    return;
  xmlClearNodeInfoSeq(&ctxt->node_seq);
  xmlCtxtReset(ctxt);
}
 
 
const xmlParserNodeInfo *
xmlParserFindNodeInfo(const xmlParserCtxtPtr ctx, const 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;
}
 
 
void
xmlInitNodeInfoSeq(xmlParserNodeInfoSeqPtr seq)
{
    if (seq == NULL)
        return;
    seq->length = 0;
    seq->maximum = 0;
    seq->buffer = NULL;
}
 
void
xmlClearNodeInfoSeq(xmlParserNodeInfoSeqPtr seq)
{
    if (seq == NULL)
        return;
    if (seq->buffer != NULL)
        xmlFree(seq->buffer);
    xmlInitNodeInfoSeq(seq);
}
 
unsigned long
xmlParserFindNodeInfoIndex(const xmlParserNodeInfoSeqPtr seq,
                           const 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;
}
 
 
void
xmlParserAddNodeInfo(xmlParserCtxtPtr ctxt,
                     const 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) ||
        (ctxt->node_seq.buffer == NULL)) {
            xmlParserNodeInfo *tmp_buffer;
            unsigned int byte_size;
 
            if (ctxt->node_seq.maximum == 0)
                ctxt->node_seq.maximum = 2;
            byte_size = (sizeof(*ctxt->node_seq.buffer) *
            (2 * ctxt->node_seq.maximum));
 
            if (ctxt->node_seq.buffer == NULL)
                tmp_buffer = (xmlParserNodeInfo *) xmlMalloc(byte_size);
            else
                tmp_buffer =
                    (xmlParserNodeInfo *) xmlRealloc(ctxt->node_seq.buffer,
                                                     byte_size);
 
            if (tmp_buffer == NULL) {
        xmlErrMemory(ctxt, "failed to allocate buffer\n");
                return;
            }
            ctxt->node_seq.buffer = tmp_buffer;
            ctxt->node_seq.maximum *= 2;
        }
 
        /* 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                   *
 *                                  *
 ************************************************************************/
int
xmlPedanticParserDefault(int val) {
    int old = xmlPedanticParserDefaultValue;
 
    xmlPedanticParserDefaultValue = val;
    return(old);
}
 
int
xmlLineNumbersDefault(int val) {
    int old = xmlLineNumbersDefaultValue;
 
    xmlLineNumbersDefaultValue = val;
    return(old);
}
 
int
xmlSubstituteEntitiesDefault(int val) {
    int old = xmlSubstituteEntitiesDefaultValue;
 
    xmlSubstituteEntitiesDefaultValue = val;
    return(old);
}
 
int
xmlKeepBlanksDefault(int val) {
    int old = xmlKeepBlanksDefaultValue;
 
    xmlKeepBlanksDefaultValue = val;
    if (!val) xmlIndentTreeOutput = 1;
    return(old);
}