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parserInternals.c
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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.
*
*/
#define IN_LIBXML
#include "libxml.h"
#if defined(_WIN32)
#define XML_DIR_SEP '\\'
#else
#define XML_DIR_SEP '/'
#endif
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxml/entities.h>
#include <libxml/xmlerror.h>
#include <libxml/encoding.h>
#include <libxml/xmlIO.h>
#include <libxml/uri.h>
#include <libxml/dict.h>
#include <libxml/xmlsave.h>
#ifdef LIBXML_CATALOG_ENABLED
#include <libxml/catalog.h>
#endif
#include <libxml/chvalid.h>
#include <libxml/nanohttp.h>
#define CUR(ctxt) ctxt->input->cur
#define END(ctxt) ctxt->input->end
#include "private/buf.h"
#include "private/enc.h"
#include "private/error.h"
#include "private/io.h"
#include "private/parser.h"
#define XML_MAX_ERRORS 100
/*
* XML_MAX_AMPLIFICATION_DEFAULT is the default maximum allowed amplification
* factor of serialized output after entity expansion.
*/
#define XML_MAX_AMPLIFICATION_DEFAULT 5
/*
* Various global defaults for parsing
*/
/**
* xmlCheckVersion:
* @version: the include version number
*
* check the compiled lib version against the include one.
*/
void
xmlCheckVersion(int version) {
int myversion = LIBXML_VERSION;
xmlInitParser();
if ((myversion / 10000) != (version / 10000)) {
fprintf(stderr,
"Fatal: program compiled against libxml %d using libxml %d\n",
(version / 10000), (myversion / 10000));
} else if ((myversion / 100) < (version / 100)) {
fprintf(stderr,
"Warning: program compiled against libxml %d using older %d\n",
(version / 100), (myversion / 100));
}
}
/************************************************************************
* *
* Some factorized error routines *
* *
************************************************************************/
/**
* xmlCtxtSetErrorHandler:
* @ctxt: an XML parser context
* @handler: error handler
* @data: data for error handler
*
* Register a callback function that will be called on errors and
* warnings. If handler is NULL, the error handler will be deactivated.
*
* This is the recommended way to collect errors from the parser and
* takes precedence over all other error reporting mechanisms.
* These are (in order of precedence):
*
* - per-context structured handler (xmlCtxtSetErrorHandler)
* - per-context structured "serror" SAX handler
* - global structured handler (xmlSetStructuredErrorFunc)
* - per-context generic "error" and "warning" SAX handlers
* - global generic handler (xmlSetGenericErrorFunc)
* - print to stderr
*
* Available since 2.13.0.
*/
void
xmlCtxtSetErrorHandler(xmlParserCtxtPtr ctxt, xmlStructuredErrorFunc handler,
void *data)
{
if (ctxt == NULL)
return;
ctxt->errorHandler = handler;
ctxt->errorCtxt = data;
}
/**
* xmlCtxtGetLastError:
* @ctx: an XML parser context
*
* Get the last parsing error registered.
*
* Returns NULL if no error occurred or a pointer to the error
*/
const xmlError *
xmlCtxtGetLastError(void *ctx)
{
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
if (ctxt == NULL)
return (NULL);
if (ctxt->lastError.code == XML_ERR_OK)
return (NULL);
return (&ctxt->lastError);
}
/**
* xmlCtxtResetLastError:
* @ctx: an XML parser context
*
* Cleanup the last global error registered. For parsing error
* this does not change the well-formedness result.
*/
void
xmlCtxtResetLastError(void *ctx)
{
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
if (ctxt == NULL)
return;
ctxt->errNo = XML_ERR_OK;
if (ctxt->lastError.code == XML_ERR_OK)
return;
xmlResetError(&ctxt->lastError);
}
/**
* xmlCtxtErrMemory:
* @ctxt: an XML parser context
*
* Handle an out-of-memory error.
*
* Available since 2.13.0.
*/
void
xmlCtxtErrMemory(xmlParserCtxtPtr ctxt)
{
xmlStructuredErrorFunc schannel = NULL;
xmlGenericErrorFunc channel = NULL;
void *data;
if (ctxt == NULL)
return;
ctxt->errNo = XML_ERR_NO_MEMORY;
ctxt->instate = XML_PARSER_EOF; /* TODO: Remove after refactoring */
ctxt->wellFormed = 0;
ctxt->disableSAX = 2;
if (ctxt->errorHandler) {
schannel = ctxt->errorHandler;
data = ctxt->errorCtxt;
} else if ((ctxt->sax->initialized == XML_SAX2_MAGIC) &&
(ctxt->sax->serror != NULL)) {
schannel = ctxt->sax->serror;
data = ctxt->userData;
} else {
channel = ctxt->sax->error;
data = ctxt->userData;
}
xmlRaiseMemoryError(schannel, channel, data, XML_FROM_PARSER,
&ctxt->lastError);
}
/**
* xmlCtxtErrIO:
* @ctxt: parser context
* @code: xmlParserErrors code
* @uri: filename or URI (optional)
*
* If filename is empty, use the one from context input if available.
*
* Report an IO error to the parser context.
*/
void
xmlCtxtErrIO(xmlParserCtxtPtr ctxt, int code, const char *uri)
{
const char *errstr, *msg, *str1, *str2;
xmlErrorLevel level;
if (ctxt == NULL)
return;
if (((code == XML_IO_ENOENT) ||
(code == XML_IO_UNKNOWN))) {
/*
* Only report a warning if a file could not be found. This should
* only be done for external entities, but the external entity loader
* of xsltproc can try multiple paths and assumes that ENOENT doesn't
* raise an error and aborts parsing.
*/
if (ctxt->validate == 0)
level = XML_ERR_WARNING;
else
level = XML_ERR_ERROR;
} else if (code == XML_IO_NETWORK_ATTEMPT) {
level = XML_ERR_ERROR;
} else {
level = XML_ERR_FATAL;
}
errstr = xmlErrString(code);
if (uri == NULL) {
msg = "%s\n";
str1 = errstr;
str2 = NULL;
} else {
msg = "failed to load \"%s\": %s\n";
str1 = uri;
str2 = errstr;
}
xmlCtxtErr(ctxt, NULL, XML_FROM_IO, code, level,
(const xmlChar *) uri, NULL, NULL, 0,
msg, str1, str2);
}
static int
xmlCtxtIsCatastrophicError(xmlParserCtxtPtr ctxt) {
int fatal = 0;
int code;
if (ctxt == NULL)
return(1);
if (ctxt->lastError.level != XML_ERR_FATAL)
return(0);
code = ctxt->lastError.code;
switch (code) {
case XML_ERR_NO_MEMORY:
case XML_ERR_RESOURCE_LIMIT:
case XML_ERR_SYSTEM:
case XML_ERR_ARGUMENT:
case XML_ERR_INTERNAL_ERROR:
fatal = 1;
break;
default:
if ((code >= 1500) && (code <= 1599))
fatal = 1;
break;
}
return(fatal);
}
/**
* xmlCtxtVErr:
* @ctxt: a parser context
* @node: the current node or NULL
* @domain: the domain for the error
* @code: the code for the error
* @level: the xmlErrorLevel for the error
* @str1: extra string info
* @str2: extra string info
* @str3: extra string info
* @int1: extra int info
* @msg: the message to display/transmit
* @ap: extra parameters for the message display
*
* Raise a parser error.
*/
void
xmlCtxtVErr(xmlParserCtxtPtr ctxt, xmlNodePtr node, xmlErrorDomain domain,
xmlParserErrors code, xmlErrorLevel level,
const xmlChar *str1, const xmlChar *str2, const xmlChar *str3,
int int1, const char *msg, va_list ap)
{
xmlStructuredErrorFunc schannel = NULL;
xmlGenericErrorFunc channel = NULL;
void *data = NULL;
const char *file = NULL;
int line = 0;
int col = 0;
int res;
if (code == XML_ERR_NO_MEMORY) {
xmlCtxtErrMemory(ctxt);
return;
}
if (ctxt == NULL)
return;
if (PARSER_STOPPED(ctxt))
return;
if (level == XML_ERR_WARNING) {
if (ctxt->nbWarnings >= XML_MAX_ERRORS)
return;
ctxt->nbWarnings += 1;
} else {
if (ctxt->nbErrors >= XML_MAX_ERRORS)
return;
ctxt->nbErrors += 1;
}
if (((ctxt->options & XML_PARSE_NOERROR) == 0) &&
((level != XML_ERR_WARNING) ||
((ctxt->options & XML_PARSE_NOWARNING) == 0))) {
if (ctxt->errorHandler) {
schannel = ctxt->errorHandler;
data = ctxt->errorCtxt;
} else if ((ctxt->sax->initialized == XML_SAX2_MAGIC) &&
(ctxt->sax->serror != NULL)) {
schannel = ctxt->sax->serror;
data = ctxt->userData;
} else if ((domain == XML_FROM_VALID) || (domain == XML_FROM_DTD)) {
if (level == XML_ERR_WARNING)
channel = ctxt->vctxt.warning;
else
channel = ctxt->vctxt.error;
data = ctxt->vctxt.userData;
} else {
if (level == XML_ERR_WARNING)
channel = ctxt->sax->warning;
else
channel = ctxt->sax->error;
data = ctxt->userData;
}
}
if (ctxt->input != NULL) {
xmlParserInputPtr input = ctxt->input;
if ((input->filename == NULL) &&
(ctxt->inputNr > 1)) {
input = ctxt->inputTab[ctxt->inputNr - 2];
}
file = input->filename;
line = input->line;
col = input->col;
}
res = xmlVRaiseError(schannel, channel, data, ctxt, node, domain, code,
level, file, line, (const char *) str1,
(const char *) str2, (const char *) str3, int1, col,
msg, ap);
if (res < 0) {
xmlCtxtErrMemory(ctxt);
return;
}
if (level >= XML_ERR_ERROR)
ctxt->errNo = code;
if (level == XML_ERR_FATAL) {
ctxt->wellFormed = 0;
if (xmlCtxtIsCatastrophicError(ctxt))
ctxt->disableSAX = 2; /* stop parser */
else if (ctxt->recovery == 0)
ctxt->disableSAX = 1;
}
}
/**
* xmlCtxtErr:
* @ctxt: a parser context
* @node: the current node or NULL
* @domain: the domain for the error
* @code: the code for the error
* @level: the xmlErrorLevel for the error
* @str1: extra string info
* @str2: extra string info
* @str3: extra string info
* @int1: extra int info
* @msg: the message to display/transmit
* @...: extra parameters for the message display
*
* Raise a parser error.
*/
void
xmlCtxtErr(xmlParserCtxtPtr ctxt, xmlNodePtr node, xmlErrorDomain domain,
xmlParserErrors code, xmlErrorLevel level,
const xmlChar *str1, const xmlChar *str2, const xmlChar *str3,
int int1, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
xmlCtxtVErr(ctxt, node, domain, code, level,
str1, str2, str3, int1, msg, ap);
va_end(ap);
}
/**
* xmlCtxtGetStatus:
* @ctxt: an XML parser context
*
* Get well-formedness and validation status after parsing. Also
* reports catastrophic errors which are not related to parsing
* like out-of-memory, I/O or other errors.
*
* Available since 2.14.0.
*
* Returns a bitmask of XML_STATUS_* flags ORed together.
*/
int
xmlCtxtGetStatus(xmlParserCtxt *ctxt) {
int bits = 0;
if (xmlCtxtIsCatastrophicError(ctxt)) {
bits |= XML_STATUS_CATASTROPHIC_ERROR |
XML_STATUS_NOT_WELL_FORMED |
XML_STATUS_NOT_NS_WELL_FORMED;
if ((ctxt != NULL) && (ctxt->validate))
bits |= XML_STATUS_DTD_VALIDATION_FAILED;
return(bits);
}
if (!ctxt->wellFormed)
bits |= XML_STATUS_NOT_WELL_FORMED;
if (!ctxt->nsWellFormed)
bits |= XML_STATUS_NOT_NS_WELL_FORMED;
if ((ctxt->validate) && (!ctxt->valid))
bits |= XML_STATUS_DTD_VALIDATION_FAILED;
return(bits);
}
/**
* xmlFatalErr:
* @ctxt: an XML parser context
* @code: the error number
* @info: extra information string
*
* Handle a fatal parser error, i.e. violating Well-Formedness constraints
*/
void
xmlFatalErr(xmlParserCtxtPtr ctxt, xmlParserErrors code, const char *info)
{
const char *errmsg;
xmlErrorLevel level;
if (code == XML_ERR_UNSUPPORTED_ENCODING)
level = XML_ERR_WARNING;
else
level = XML_ERR_FATAL;
errmsg = xmlErrString(code);
if (info == NULL) {
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, code, level,
NULL, NULL, NULL, 0, "%s\n", errmsg);
} else {
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, code, level,
(const xmlChar *) info, NULL, NULL, 0,
"%s: %s\n", errmsg, info);
}
}
/**
* xmlIsLetter:
* @c: an unicode character (int)
*
* DEPRECATED: Internal function, don't use.
*
* Check whether the character is allowed by the production
* [84] Letter ::= BaseChar | Ideographic
*
* Returns 0 if not, non-zero otherwise
*/
int
xmlIsLetter(int c) {
return(IS_BASECHAR(c) || IS_IDEOGRAPHIC(c));
}
/************************************************************************
* *
* Input handling functions for progressive parsing *
* *
************************************************************************/
/* we need to keep enough input to show errors in context */
#define LINE_LEN 80
/**
* xmlHaltParser:
* @ctxt: an XML parser context
*
* Blocks further parser processing don't override error
* for internal use
*/
void
xmlHaltParser(xmlParserCtxtPtr ctxt) {
if (ctxt == NULL)
return;
ctxt->instate = XML_PARSER_EOF; /* TODO: Remove after refactoring */
ctxt->disableSAX = 2;
}
/**
* xmlParserInputRead:
* @in: an XML parser input
* @len: an indicative size for the lookahead
*
* DEPRECATED: This function was internal and is deprecated.
*
* Returns -1 as this is an error to use it.
*/
int
xmlParserInputRead(xmlParserInputPtr in ATTRIBUTE_UNUSED, int len ATTRIBUTE_UNUSED) {
return(-1);
}
/**
* xmlParserGrow:
* @ctxt: an XML parser context
*
* Grow the input buffer.
*
* Returns the number of bytes read or -1 in case of error.
*/
int
xmlParserGrow(xmlParserCtxtPtr ctxt) {
xmlParserInputPtr in = ctxt->input;
xmlParserInputBufferPtr buf = in->buf;
size_t curEnd = in->end - in->cur;
size_t curBase = in->cur - in->base;
size_t maxLength = (ctxt->options & XML_PARSE_HUGE) ?
XML_MAX_HUGE_LENGTH :
XML_MAX_LOOKUP_LIMIT;
int ret;
if (buf == NULL)
return(0);
/* Don't grow push parser buffer. */
if (PARSER_PROGRESSIVE(ctxt))
return(0);
/* Don't grow memory buffers. */
if ((buf->encoder == NULL) && (buf->readcallback == NULL))
return(0);
if (buf->error != 0)
return(-1);
if (curBase > maxLength) {
xmlFatalErr(ctxt, XML_ERR_RESOURCE_LIMIT,
"Buffer size limit exceeded, try XML_PARSE_HUGE\n");
xmlHaltParser(ctxt);
return(-1);
}
if (curEnd >= INPUT_CHUNK)
return(0);
ret = xmlParserInputBufferGrow(buf, INPUT_CHUNK);
xmlBufUpdateInput(buf->buffer, in, curBase);
if (ret < 0) {
xmlCtxtErrIO(ctxt, buf->error, NULL);
}
return(ret);
}
/**
* xmlParserInputGrow:
* @in: an XML parser input
* @len: an indicative size for the lookahead
*
* DEPRECATED: Don't use.
*
* This function increase the input for the parser. It tries to
* preserve pointers to the input buffer, and keep already read data
*
* Returns the amount of char read, or -1 in case of error, 0 indicate the
* end of this entity
*/
int
xmlParserInputGrow(xmlParserInputPtr in, int len) {
int ret;
size_t indx;
if ((in == NULL) || (len < 0)) return(-1);
if (in->buf == NULL) return(-1);
if (in->base == NULL) return(-1);
if (in->cur == NULL) return(-1);
if (in->buf->buffer == NULL) return(-1);
/* Don't grow memory buffers. */
if ((in->buf->encoder == NULL) && (in->buf->readcallback == NULL))
return(0);
indx = in->cur - in->base;
if (xmlBufUse(in->buf->buffer) > (unsigned int) indx + INPUT_CHUNK) {
return(0);
}
ret = xmlParserInputBufferGrow(in->buf, len);
in->base = xmlBufContent(in->buf->buffer);
if (in->base == NULL) {
in->base = BAD_CAST "";
in->cur = in->base;
in->end = in->base;
return(-1);
}
in->cur = in->base + indx;
in->end = xmlBufEnd(in->buf->buffer);
return(ret);
}
/**
* xmlParserShrink:
* @ctxt: an XML parser context
*
* Shrink the input buffer.
*/
void
xmlParserShrink(xmlParserCtxtPtr ctxt) {
xmlParserInputPtr in = ctxt->input;
xmlParserInputBufferPtr buf = in->buf;
size_t used;
if (buf == NULL)
return;
/* Don't shrink pull parser memory buffers. */
if ((!PARSER_PROGRESSIVE(ctxt)) &&
(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;
}
}
xmlBufUpdateInput(buf->buffer, in, used);
}
/**
* xmlParserInputShrink:
* @in: an XML parser input
*
* DEPRECATED: Don't use.
*
* This function removes used input for the parser.
*/
void
xmlParserInputShrink(xmlParserInputPtr in) {
size_t used;
size_t ret;
if (in == NULL) return;
if (in->buf == NULL) return;
if (in->base == NULL) return;
if (in->cur == NULL) return;
if (in->buf->buffer == NULL) return;
used = in->cur - in->base;
/*
* 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);
}
/************************************************************************
* *
* UTF8 character input and related functions *
* *
************************************************************************/
/**
* xmlNextChar:
* @ctxt: the XML parser context
*
* DEPRECATED: Internal function, do not use.
*
* Skip to the next char input char.
*/
void
xmlNextChar(xmlParserCtxtPtr ctxt)
{
const unsigned char *cur;
size_t avail;
int c;
if ((ctxt == NULL) || (ctxt->input == NULL))
return;
avail = ctxt->input->end - ctxt->input->cur;
if (avail < INPUT_CHUNK) {
xmlParserGrow(ctxt);
if (ctxt->input->cur >= ctxt->input->end)
return;
avail = ctxt->input->end - ctxt->input->cur;
}
cur = ctxt->input->cur;
c = *cur;
if (c < 0x80) {
if (c == '\n') {
ctxt->input->cur++;
ctxt->input->line++;
ctxt->input->col = 1;
} else if (c == '\r') {
/*
* 2.11 End-of-Line Handling
* the literal two-character sequence "#xD#xA" or a standalone
* literal #xD, an XML processor must pass to the application
* the single character #xA.
*/
ctxt->input->cur += ((cur[1] == '\n') ? 2 : 1);
ctxt->input->line++;
ctxt->input->col = 1;
return;
} else {
ctxt->input->cur++;
ctxt->input->col++;
}
} else {
ctxt->input->col++;
if ((avail < 2) || (cur[1] & 0xc0) != 0x80)
goto encoding_error;
if (c < 0xe0) {
/* 2-byte code */
if (c < 0xc2)
goto encoding_error;
ctxt->input->cur += 2;
} else {
unsigned int val = (c << 8) | cur[1];
if ((avail < 3) || (cur[2] & 0xc0) != 0x80)
goto encoding_error;
if (c < 0xf0) {
/* 3-byte code */
if ((val < 0xe0a0) || ((val >= 0xeda0) && (val < 0xee00)))
goto encoding_error;
ctxt->input->cur += 3;
} else {
if ((avail < 4) || ((cur[3] & 0xc0) != 0x80))
goto encoding_error;
/* 4-byte code */
if ((val < 0xf090) || (val >= 0xf490))
goto encoding_error;
ctxt->input->cur += 4;
}
}
}
return;
encoding_error:
/* Only report the first error */
if ((ctxt->input->flags & XML_INPUT_ENCODING_ERROR) == 0) {
xmlCtxtErrIO(ctxt, XML_ERR_INVALID_ENCODING, NULL);
ctxt->input->flags |= XML_INPUT_ENCODING_ERROR;
}
ctxt->input->cur++;
}
/**
* xmlCurrentChar:
* @ctxt: the XML parser context
* @len: pointer to the length of the char read
*
* DEPRECATED: Internal function, do not use.
*
* The current char value, if using UTF-8 this may actually span multiple
* bytes in the input buffer. Implement the end of line normalization:
* 2.11 End-of-Line Handling
* Wherever an external parsed entity or the literal entity value
* of an internal parsed entity contains either the literal two-character
* sequence "#xD#xA" or a standalone literal #xD, an XML processor
* must pass to the application the single character #xA.
* This behavior can conveniently be produced by normalizing all
* line breaks to #xA on input, before parsing.)
*
* Returns the current char value and its length
*/
int
xmlCurrentChar(xmlParserCtxtPtr ctxt, int *len) {
const unsigned char *cur;
size_t avail;
int c;
if ((ctxt == NULL) || (len == NULL) || (ctxt->input == NULL)) return(0);
avail = ctxt->input->end - ctxt->input->cur;
if (avail < INPUT_CHUNK) {
xmlParserGrow(ctxt);
avail = ctxt->input->end - ctxt->input->cur;
}
cur = ctxt->input->cur;
c = *cur;
if (c < 0x80) {
/* 1-byte code */
if (c < 0x20) {
/*
* 2.11 End-of-Line Handling
* the literal two-character sequence "#xD#xA" or a standalone
* literal #xD, an XML processor must pass to the application
* the single character #xA.
*/
if (c == '\r') {
/*
* TODO: This function shouldn't change the 'cur' pointer
* as side effect, but the NEXTL macro in parser.c relies
* on this behavior when incrementing line numbers.
*/
if (cur[1] == '\n')
ctxt->input->cur++;
*len = 1;
c = '\n';
} else if (c == 0) {
if (ctxt->input->cur >= ctxt->input->end) {
*len = 0;
} else {
*len = 1;
/*
* TODO: Null bytes should be handled by callers,
* but this can be tricky.
*/
xmlFatalErr(ctxt, XML_ERR_INVALID_CHAR,
"Char 0x0 out of allowed range\n");
}
} else {
*len = 1;
}
} else {
*len = 1;
}
return(c);
} else {
int val;
if (avail < 2)
goto incomplete_sequence;
if ((cur[1] & 0xc0) != 0x80)
goto encoding_error;
if (c < 0xe0) {
/* 2-byte code */
if (c < 0xc2)
goto encoding_error;
val = (c & 0x1f) << 6;
val |= cur[1] & 0x3f;
*len = 2;
} else {
if (avail < 3)
goto incomplete_sequence;
if ((cur[2] & 0xc0) != 0x80)
goto encoding_error;
if (c < 0xf0) {
/* 3-byte code */
val = (c & 0xf) << 12;
val |= (cur[1] & 0x3f) << 6;
val |= cur[2] & 0x3f;
if ((val < 0x800) || ((val >= 0xd800) && (val < 0xe000)))
goto encoding_error;
*len = 3;
} else {
if (avail < 4)
goto incomplete_sequence;
if ((cur[3] & 0xc0) != 0x80)
goto encoding_error;
/* 4-byte code */
val = (c & 0x0f) << 18;
val |= (cur[1] & 0x3f) << 12;
val |= (cur[2] & 0x3f) << 6;
val |= cur[3] & 0x3f;
if ((val < 0x10000) || (val >= 0x110000))
goto encoding_error;
*len = 4;
}
}
return(val);
}
encoding_error:
/* Only report the first error */
if ((ctxt->input->flags & XML_INPUT_ENCODING_ERROR) == 0) {
xmlCtxtErrIO(ctxt, XML_ERR_INVALID_ENCODING, NULL);
ctxt->input->flags |= XML_INPUT_ENCODING_ERROR;
}
*len = 1;
return(XML_INVALID_CHAR);
incomplete_sequence:
/*
* An encoding problem may arise from a truncated input buffer
* splitting a character in the middle. In that case do not raise
* an error but return 0. This should only happen when push parsing
* char data.
*/
*len = 0;
return(0);
}
/**
* xmlStringCurrentChar:
* @ctxt: the XML parser context
* @cur: pointer to the beginning of the char
* @len: pointer to the length of the char read
*
* DEPRECATED: Internal function, do not use.
*
* The current char value, if using UTF-8 this may actually span multiple
* bytes in the input buffer.
*
* Returns the current char value and its length
*/
int