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libxml2/parserInternals.c
Nick Wellnhofer 044eebfede parser: Make xmlSwitchEncoding always skip the BOM 
Chromium calls xmlSwitchEncoding from the start document handler and
relies on this function to skip the BOM. Commit 98840d40 changed the
behavior when switching to UTF-16 since inspecting the input buffer at
this point is fragile.

Revert part of the commit to also skip a potential (decoded UTF-8) BOM
when switching to UTF-16. Make sure that we do this only at the start of
an input stream to avoid U-FEFF characters being lost.

BOM handling should ultimately be moved to the parsing code to avoid
such bugs.

See https://bugs.chromium.org/p/chromium/issues/detail?id=1451026
2023-07-14 00:00:44 +02:00

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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 "private/buf.h"
#include "private/enc.h"
#include "private/error.h"
#include "private/io.h"
#include "private/parser.h"
/*
* Various global defaults for parsing
*/
/**
* xmlCheckVersion:
* @version: the include version number
*
* check the compiled lib version against the include one.
* This can warn or immediately kill the application
*/
void
xmlCheckVersion(int version) {
int myversion = 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 *
* *
************************************************************************/
/**
* xmlErrMemory:
* @ctxt: an XML parser context
* @extra: extra information
*
* Handle a redefinition of attribute error
*/
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");
}
/**
* __xmlErrEncoding:
* @ctxt: an XML parser context
* @xmlerr: the error number
* @msg: the error message
* @str1: an string info
* @str2: an string info
*
* Handle an encoding error
*/
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;
}
}
/**
* xmlErrInternal:
* @ctxt: an XML parser context
* @msg: the error message
* @str: error information
*
* Handle an internal error
*/
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;
}
}
/**
* xmlErrEncodingInt:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @val: an integer value
*
* n encoding error
*/
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;
}
}
/**
* xmlIsLetter:
* @c: an unicode character (int)
*
* 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 *
* *
************************************************************************/
/* #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 %p : content %x, cur %d, use %d\n",
(void *) in, (int) xmlBufContent(in->buf->buffer),
in->cur - in->base, xmlBufUse(in->buf->buffer));
}
#else
#define CHECK_BUFFER(in)
#endif
/**
* 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;
ctxt->disableSAX = 1;
while (ctxt->inputNr > 1)
xmlFreeInputStream(inputPop(ctxt));
if (ctxt->input != NULL) {
/*
* in case there was a specific allocation deallocate before
* overriding base
*/
if (ctxt->input->free != NULL) {
ctxt->input->free((xmlChar *) ctxt->input->base);
ctxt->input->free = NULL;
}
if (ctxt->input->buf != NULL) {
xmlFreeParserInputBuffer(ctxt->input->buf);
ctxt->input->buf = NULL;
}
ctxt->input->cur = BAD_CAST"";
ctxt->input->length = 0;
ctxt->input->base = ctxt->input->cur;
ctxt->input->end = ctxt->input->cur;
}
}
/**
* 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
*/
int
xmlParserGrow(xmlParserCtxtPtr ctxt) {
xmlParserInputPtr in = ctxt->input;
xmlParserInputBufferPtr buf = in->buf;
ptrdiff_t curEnd = in->end - in->cur;
ptrdiff_t curBase = in->cur - in->base;
int ret;
if (buf == NULL)
return(0);
/* Don't grow push parser buffer. */
if (ctxt->progressive)
return(0);
/* Don't grow memory buffers. */
if ((buf->encoder == NULL) && (buf->readcallback == NULL))
return(0);
if (((curEnd > XML_MAX_LOOKUP_LIMIT) ||
(curBase > XML_MAX_LOOKUP_LIMIT)) &&
((ctxt->options & XML_PARSE_HUGE) == 0)) {
xmlErrInternal(ctxt, "Huge input lookup", NULL);
xmlHaltParser(ctxt);
return(-1);
}
if (curEnd >= INPUT_CHUNK)
return(0);
ret = xmlParserInputBufferGrow(buf, INPUT_CHUNK);
xmlBufSetInputBaseCur(buf->buffer, in, 0, curBase);
/* TODO: Get error code from xmlParserInputBufferGrow */
if (ret < 0) {
xmlErrInternal(ctxt, "Growing input buffer", NULL);
xmlHaltParser(ctxt);
}
return(ret);
}
/**
* 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);
#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);
/* Don't grow memory buffers. */
if ((in->buf->encoder == NULL) && (in->buf->readcallback == NULL))
return(0);
CHECK_BUFFER(in);
indx = in->cur - in->base;
if (xmlBufUse(in->buf->buffer) > (unsigned int) indx + INPUT_CHUNK) {
CHECK_BUFFER(in);
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);
CHECK_BUFFER(in);
return(ret);
}
/**
* xmlParserShrink:
* @ctxt: an XML parser context
*/
void
xmlParserShrink(xmlParserCtxtPtr ctxt) {
xmlParserInputPtr in = ctxt->input;
xmlParserInputBufferPtr buf = in->buf;
size_t used;
/* Don't shrink pull parser memory buffers. */
if ((buf == NULL) ||
((ctxt->progressive == 0) &&
(buf->encoder == NULL) && (buf->readcallback == NULL)))
return;
used = in->cur - in->base;
/*
* Do not shrink on large buffers whose only a tiny fraction
* was consumed
*/
if (used > INPUT_CHUNK) {
size_t 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;
}
}
xmlBufSetInputBaseCur(buf->buffer, in, 0, 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;
#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;
if ((ret > ULONG_MAX) ||
(in->consumed > ULONG_MAX - (unsigned long)ret))
in->consumed = ULONG_MAX;
else
in->consumed += ret;
}
}
if (xmlBufUse(in->buf->buffer) <= INPUT_CHUNK) {
xmlParserInputBufferRead(in->buf, 2 * INPUT_CHUNK);
}
in->base = xmlBufContent(in->buf->buffer);
if (in->base == NULL) {
/* TODO: raise error */
in->base = BAD_CAST "";
in->cur = in->base;
in->end = in->base;
return;
}
in->cur = in->base + used;
in->end = xmlBufEnd(in->buf->buffer);
CHECK_BUFFER(in);
}
/************************************************************************
* *
* 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)
{
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->end - ctxt->input->cur < INPUT_CHUNK) {
if (xmlParserGrow(ctxt) < 0)
return;
if (ctxt->input->cur >= ctxt->input->end)
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) {
size_t avail;
if (c == 0xC0)
goto encoding_error;
avail = ctxt->input->end - ctxt->input->cur;
if ((avail < 2) || (cur[1] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xe0) == 0xe0) {
unsigned int val;
if ((avail < 3) || (cur[2] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xf0) == 0xf0) {
if (((c & 0xf8) != 0xf0) ||
(avail < 4) || ((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++;
}
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;
}
/**
* 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) {
if ((ctxt == NULL) || (len == NULL) || (ctxt->input == NULL)) return(0);
if (ctxt->instate == XML_PARSER_EOF)
return(0);
if ((ctxt->input->end - ctxt->input->cur < INPUT_CHUNK) &&
(xmlParserGrow(ctxt) < 0))
return(0);
if ((*ctxt->input->cur >= 0x20) && (*ctxt->input->cur <= 0x7F)) {
*len = 1;
return(*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) {
size_t avail;
if (((c & 0x40) == 0) || (c == 0xC0))
goto encoding_error;
avail = ctxt->input->end - ctxt->input->cur;
if (avail < 2)
goto incomplete_sequence;
if ((cur[1] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xe0) == 0xe0) {
if (avail < 3)
goto incomplete_sequence;
if ((cur[2] & 0xc0) != 0x80)
goto encoding_error;
if ((c & 0xf0) == 0xf0) {
if (avail < 4)
goto incomplete_sequence;
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) &&
(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(*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(*ctxt->input->cur);
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->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[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(*ctxt->input->cur);
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, 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 (*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 (*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 (*cur);
}
/**
* xmlCopyCharMultiByte:
* @out: pointer to an array of xmlChar
* @val: the char value
*
* 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 {
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 = val;
return 1;
}
/**
* xmlCopyChar:
* @len: Ignored, compatibility
* @out: pointer to an array of xmlChar
* @val: the char value
*
* 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 *
* *
************************************************************************/
static xmlCharEncodingHandlerPtr
xmlDetectEBCDIC(xmlParserInputPtr input) {
xmlChar out[200];
xmlCharEncodingHandlerPtr handler;
int inlen, outlen, res, i;
/*
* To detect the EBCDIC code page, we convert the first 200 bytes
* to EBCDIC-US and try to find the encoding declaration.
*/
handler = xmlGetCharEncodingHandler(XML_CHAR_ENCODING_EBCDIC);
if (handler == NULL)
return(NULL);
outlen = sizeof(out) - 1;
inlen = input->end - input->cur;
res = xmlEncInputChunk(handler, out, &outlen, input->cur, &inlen, 0);
if (res < 0)
return(handler);
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);
handler = xmlFindCharEncodingHandler((char *) out + start);
break;
}
}
return(handler);
}
/**
* xmlSwitchEncoding:
* @ctxt: the parser context
* @enc: the encoding value (number)
*
* change the input functions when discovering the character encoding
* of a given entity.
*
* Returns 0 in case of success, -1 otherwise
*/
int
xmlSwitchEncoding(xmlParserCtxtPtr ctxt, xmlCharEncoding enc)
{
xmlCharEncodingHandlerPtr handler;
int ret;
if (ctxt == NULL) return(-1);
/*
* FIXME: The BOM shouldn't be skipped here, but in the parsing code.
*
* Note that we look for a decoded UTF-8 BOM when switching to UTF-16.
* This is mostly useless but Webkit/Chromium relies on this behavior.
* See https://bugs.chromium.org/p/chromium/issues/detail?id=1451026
*/
if ((ctxt->input != NULL) &&
(ctxt->input->consumed == 0) &&
(ctxt->input->cur != NULL) &&
(ctxt->input->cur == ctxt->input->base) &&
((enc == XML_CHAR_ENCODING_UTF8) ||
(enc == XML_CHAR_ENCODING_UTF16LE) ||
(enc == XML_CHAR_ENCODING_UTF16BE))) {
/*
* Errata on XML-1.0 June 20 2001
* Specific handling of the Byte Order Mark for
* UTF-8
*/
if ((ctxt->input->cur[0] == 0xEF) &&
(ctxt->input->cur[1] == 0xBB) &&
(ctxt->input->cur[2] == 0xBF)) {
ctxt->input->cur += 3;
}
}
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;
return(0);
case XML_CHAR_ENCODING_EBCDIC:
handler = xmlDetectEBCDIC(ctxt->input);
break;
default:
handler = xmlGetCharEncodingHandler(enc);
break;
}
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 = xmlSwitchInputEncoding(ctxt, ctxt->input, handler);
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);
}
/**
* xmlSwitchInputEncoding:
* @ctxt: the parser context
* @input: the input stream
* @handler: the encoding handler
*
* change the input functions when discovering the character encoding
* of a given entity.
*
* Returns 0 in case of success, -1 otherwise
*/
int
xmlSwitchInputEncoding(xmlParserCtxtPtr ctxt, xmlParserInputPtr input,
xmlCharEncodingHandlerPtr handler)
{
int nbchars;
xmlParserInputBufferPtr in;
if (handler == NULL)
return (-1);
if (input == NULL)
return (-1);
in = input->buf;
if (in == NULL) {
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);
}
if (in->encoder != NULL) {
if (in->encoder == handler)
return (0);
/*
* 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 (0);
}
ctxt->charset = XML_CHAR_ENCODING_UTF8;
in->encoder = handler;
/*
* Is there already some content down the pipe to convert ?
*/
if (xmlBufIsEmpty(in->buffer) == 0) {
size_t processed, use, consumed;
/*
* FIXME: The BOM shouldn't be skipped here, but in the parsing code.
*/
/*
* 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(in->buffer, processed);
input->consumed += processed;
in->raw = in->buffer;
in->buffer = xmlBufCreate();
in->rawconsumed = processed;
use = xmlBufUse(in->raw);
/*
* TODO: We must flush and decode the whole buffer to make functions
* like xmlReadMemory work with a user-provided encoding. If the
* encoding is specified directly, we should probably set
* XML_PARSE_IGNORE_ENC in xmlDoRead to avoid switching encodings
* twice. Then we could set "flush" to false which should save
* a considerable amount of memory when parsing from memory.
* It's probably even possible to remove this whole if-block
* completely.
*/
nbchars = xmlCharEncInput(in, 1);
xmlBufResetInput(in->buffer, input);
if (nbchars < 0) {
/* TODO: This could be an out of memory or an encoding error. */
xmlErrInternal(ctxt,
"switching encoding: encoder error\n",
NULL);
xmlHaltParser(ctxt);
return (-1);
}
consumed = use - xmlBufUse(in->raw);
if ((consumed > ULONG_MAX) ||
(in->rawconsumed > ULONG_MAX - (unsigned long)consumed))
in->rawconsumed = ULONG_MAX;
else
in->rawconsumed += consumed;
}
return (0);
}
/**
* xmlSwitchToEncoding:
* @ctxt: the parser context
* @handler: the encoding handler
*
* change the input functions when discovering the character encoding
* of a given entity.
*
* Returns 0 in case of success, -1 otherwise
*/
int
xmlSwitchToEncoding(xmlParserCtxtPtr ctxt, xmlCharEncodingHandlerPtr handler)
{
if (ctxt == NULL)
return(-1);
return(xmlSwitchInputEncoding(ctxt, ctxt->input, handler));
}
/************************************************************************
* *
* 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->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);
}
/**
* xmlNewInputStream:
* @ctxt: an XML parser context
*
* 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) {
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) {
if (input->id >= INT_MAX) {
xmlErrMemory(ctxt, "Input ID overflow\n");
return(NULL);
}
input->id = ctxt->input_id++;
}
return(input);
}
/**
* xmlNewIOInputStream:
* @ctxt: an XML parser context
* @input: an I/O Input
* @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 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);
}
/**
* xmlNewEntityInputStream:
* @ctxt: an XML parser context
* @entity: 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 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:
input = xmlLoadExternalEntity((char *) entity->URI,
(char *) entity->ExternalID, ctxt);
if (input != NULL)
input->entity = entity;
return(input);
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];
input->entity = entity;
return(input);
}
/**
* xmlNewStringInputStream:
* @ctxt: an XML parser context
* @buffer: an memory buffer
*
* Create a new input stream based on a memory buffer.
* Returns the new input stream
*/
xmlParserInputPtr
xmlNewStringInputStream(xmlParserCtxtPtr ctxt, const xmlChar *buffer) {
xmlParserInputPtr input;
xmlParserInputBufferPtr buf;
if (buffer == NULL) {
xmlErrInternal(ctxt, "xmlNewStringInputStream string = NULL\n",
NULL);
return(NULL);
}
if (xmlParserDebugEntities)
xmlGenericError(xmlGenericErrorContext,
"new fixed input: %.30s\n", buffer);
buf = xmlParserInputBufferCreateMem((const char *) buffer,
xmlStrlen(buffer),
XML_CHAR_ENCODING_NONE);
if (buf == NULL) {
xmlErrMemory(ctxt, NULL);
return(NULL);
}
input = xmlNewInputStream(ctxt);
if (input == NULL) {
xmlErrMemory(ctxt, "couldn't allocate a new input stream\n");
xmlFreeParserInputBuffer(buf);
return(NULL);
}
input->buf = buf;
xmlBufResetInput(input->buf->buffer, input);
return(input);
}
/**
* xmlNewInputFromFile:
* @ctxt: an XML parser context
* @filename: the filename to use as entity
*
* 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) {
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 *
* *
************************************************************************/
/**
* 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;
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);
}
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) {
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->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->sizeentities = 0;
ctxt->sizeentcopy = 0;
ctxt->input_id = 1;
xmlInitNodeInfoSeq(&ctxt->node_seq);
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 = 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);
}
/**
* 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.
*
* Returns the xmlParserCtxtPtr or NULL if memory allocation failed.
*/
xmlParserCtxtPtr
xmlNewSAXParserCtxt(const xmlSAXHandler *sax, void *userData)
{
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 (xmlInitSAXParserCtxt(ctxt, sax, userData) < 0) {
xmlFreeParserCtxt(ctxt);
return(NULL);
}
return(ctxt);
}
/************************************************************************
* *
* 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(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;
}
/**
* 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(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;
}
/**
* 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,
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 *
* *
************************************************************************/
/**
* 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;
if (!val) xmlIndentTreeOutput = 1;
return(old);
}
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