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xmlIO.c
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xmlIO.c
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/*
* xmlIO.c : implementation of the I/O interfaces used by the parser
*
* See Copyright for the status of this software.
*
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
#ifdef HAVE_DIRECT_H
#include <direct.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef LIBXML_ZLIB_ENABLED
#include <zlib.h>
#endif
#ifdef LIBXML_LZMA_ENABLED
#include <lzma.h>
#endif
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <io.h>
#include <direct.h>
#endif
#include <libxml/xmlIO.h>
#include <libxml/xmlmemory.h>
#include <libxml/uri.h>
#include <libxml/nanohttp.h>
#include <libxml/nanoftp.h>
#include <libxml/xmlerror.h>
#ifdef LIBXML_CATALOG_ENABLED
#include <libxml/catalog.h>
#endif
#include "private/buf.h"
#include "private/enc.h"
#include "private/error.h"
#include "private/io.h"
#include "private/parser.h"
/* #define VERBOSE_FAILURE */
#define MINLEN 4000
#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif
#ifndef S_ISDIR
# ifdef _S_ISDIR
# define S_ISDIR(x) _S_ISDIR(x)
# elif defined(S_IFDIR)
# ifdef S_IFMT
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
# elif defined(_S_IFMT)
# define S_ISDIR(m) (((m) & _S_IFMT) == S_IFDIR)
# endif
# endif
#endif
/*
* Input I/O callback sets
*/
typedef struct _xmlInputCallback {
xmlInputMatchCallback matchcallback;
xmlInputOpenCallback opencallback;
xmlInputReadCallback readcallback;
xmlInputCloseCallback closecallback;
} xmlInputCallback;
/* This dummy function only marks default IO in the callback table */
static int
xmlIODefaultMatch(const char *filename);
#define MAX_INPUT_CALLBACK 10
static xmlInputCallback xmlInputCallbackTable[MAX_INPUT_CALLBACK];
static int xmlInputCallbackNr;
#ifdef LIBXML_OUTPUT_ENABLED
/*
* Output I/O callback sets
*/
typedef struct _xmlOutputCallback {
xmlOutputMatchCallback matchcallback;
xmlOutputOpenCallback opencallback;
xmlOutputWriteCallback writecallback;
xmlOutputCloseCallback closecallback;
} xmlOutputCallback;
#define MAX_OUTPUT_CALLBACK 10
static xmlOutputCallback xmlOutputCallbackTable[MAX_OUTPUT_CALLBACK];
static int xmlOutputCallbackNr;
#endif /* LIBXML_OUTPUT_ENABLED */
/************************************************************************
* *
* Error handling *
* *
************************************************************************/
/**
* xmlIOErrMemory:
* @extra: extra information
*
* Handle an out of memory condition
*/
static void
xmlIOErrMemory(void)
{
xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_IO, NULL);
}
/**
* __xmlIOErr:
* @code: the error number
* @
* @extra: extra information
*
* Handle an I/O error
*/
int
__xmlIOErr(int domain, int code, const char *extra)
{
xmlStructuredErrorFunc schannel = NULL;
xmlGenericErrorFunc channel = NULL;
void *data = NULL;
const char *fmt, *arg1, *arg2;
int res;
if (code == 0) {
if (errno == 0) code = XML_IO_UNKNOWN;
#ifdef EACCES
else if (errno == EACCES) code = XML_IO_EACCES;
#endif
#ifdef EAGAIN
else if (errno == EAGAIN) code = XML_IO_EAGAIN;
#endif
#ifdef EBADF
else if (errno == EBADF) code = XML_IO_EBADF;
#endif
#ifdef EBADMSG
else if (errno == EBADMSG) code = XML_IO_EBADMSG;
#endif
#ifdef EBUSY
else if (errno == EBUSY) code = XML_IO_EBUSY;
#endif
#ifdef ECANCELED
else if (errno == ECANCELED) code = XML_IO_ECANCELED;
#endif
#ifdef ECHILD
else if (errno == ECHILD) code = XML_IO_ECHILD;
#endif
#ifdef EDEADLK
else if (errno == EDEADLK) code = XML_IO_EDEADLK;
#endif
#ifdef EDOM
else if (errno == EDOM) code = XML_IO_EDOM;
#endif
#ifdef EEXIST
else if (errno == EEXIST) code = XML_IO_EEXIST;
#endif
#ifdef EFAULT
else if (errno == EFAULT) code = XML_IO_EFAULT;
#endif
#ifdef EFBIG
else if (errno == EFBIG) code = XML_IO_EFBIG;
#endif
#ifdef EINPROGRESS
else if (errno == EINPROGRESS) code = XML_IO_EINPROGRESS;
#endif
#ifdef EINTR
else if (errno == EINTR) code = XML_IO_EINTR;
#endif
#ifdef EINVAL
else if (errno == EINVAL) code = XML_IO_EINVAL;
#endif
#ifdef EIO
else if (errno == EIO) code = XML_IO_EIO;
#endif
#ifdef EISDIR
else if (errno == EISDIR) code = XML_IO_EISDIR;
#endif
#ifdef EMFILE
else if (errno == EMFILE) code = XML_IO_EMFILE;
#endif
#ifdef EMLINK
else if (errno == EMLINK) code = XML_IO_EMLINK;
#endif
#ifdef EMSGSIZE
else if (errno == EMSGSIZE) code = XML_IO_EMSGSIZE;
#endif
#ifdef ENAMETOOLONG
else if (errno == ENAMETOOLONG) code = XML_IO_ENAMETOOLONG;
#endif
#ifdef ENFILE
else if (errno == ENFILE) code = XML_IO_ENFILE;
#endif
#ifdef ENODEV
else if (errno == ENODEV) code = XML_IO_ENODEV;
#endif
#ifdef ENOENT
else if (errno == ENOENT) code = XML_IO_ENOENT;
#endif
#ifdef ENOEXEC
else if (errno == ENOEXEC) code = XML_IO_ENOEXEC;
#endif
#ifdef ENOLCK
else if (errno == ENOLCK) code = XML_IO_ENOLCK;
#endif
#ifdef ENOMEM
else if (errno == ENOMEM) code = XML_IO_ENOMEM;
#endif
#ifdef ENOSPC
else if (errno == ENOSPC) code = XML_IO_ENOSPC;
#endif
#ifdef ENOSYS
else if (errno == ENOSYS) code = XML_IO_ENOSYS;
#endif
#ifdef ENOTDIR
else if (errno == ENOTDIR) code = XML_IO_ENOTDIR;
#endif
#ifdef ENOTEMPTY
else if (errno == ENOTEMPTY) code = XML_IO_ENOTEMPTY;
#endif
#ifdef ENOTSUP
else if (errno == ENOTSUP) code = XML_IO_ENOTSUP;
#endif
#ifdef ENOTTY
else if (errno == ENOTTY) code = XML_IO_ENOTTY;
#endif
#ifdef ENXIO
else if (errno == ENXIO) code = XML_IO_ENXIO;
#endif
#ifdef EPERM
else if (errno == EPERM) code = XML_IO_EPERM;
#endif
#ifdef EPIPE
else if (errno == EPIPE) code = XML_IO_EPIPE;
#endif
#ifdef ERANGE
else if (errno == ERANGE) code = XML_IO_ERANGE;
#endif
#ifdef EROFS
else if (errno == EROFS) code = XML_IO_EROFS;
#endif
#ifdef ESPIPE
else if (errno == ESPIPE) code = XML_IO_ESPIPE;
#endif
#ifdef ESRCH
else if (errno == ESRCH) code = XML_IO_ESRCH;
#endif
#ifdef ETIMEDOUT
else if (errno == ETIMEDOUT) code = XML_IO_ETIMEDOUT;
#endif
#ifdef EXDEV
else if (errno == EXDEV) code = XML_IO_EXDEV;
#endif
#ifdef ENOTSOCK
else if (errno == ENOTSOCK) code = XML_IO_ENOTSOCK;
#endif
#ifdef EISCONN
else if (errno == EISCONN) code = XML_IO_EISCONN;
#endif
#ifdef ECONNREFUSED
else if (errno == ECONNREFUSED) code = XML_IO_ECONNREFUSED;
#endif
#ifdef ETIMEDOUT
else if (errno == ETIMEDOUT) code = XML_IO_ETIMEDOUT;
#endif
#ifdef ENETUNREACH
else if (errno == ENETUNREACH) code = XML_IO_ENETUNREACH;
#endif
#ifdef EADDRINUSE
else if (errno == EADDRINUSE) code = XML_IO_EADDRINUSE;
#endif
#ifdef EINPROGRESS
else if (errno == EINPROGRESS) code = XML_IO_EINPROGRESS;
#endif
#ifdef EALREADY
else if (errno == EALREADY) code = XML_IO_EALREADY;
#endif
#ifdef EAFNOSUPPORT
else if (errno == EAFNOSUPPORT) code = XML_IO_EAFNOSUPPORT;
#endif
else code = XML_IO_UNKNOWN;
}
if (xmlStructuredError) {
schannel = xmlStructuredError;
data = xmlStructuredErrorContext;
} else {
channel = xmlGenericError;
data = xmlGenericErrorContext;
}
if (extra != NULL) {
fmt = "%s: %s";
} else {
fmt = "%s";
}
arg1 = xmlErrString(code);
arg2 = extra;
res = __xmlRaiseError(schannel, channel, data, NULL, NULL,
domain, code, XML_ERR_ERROR, NULL, 0,
extra, NULL, NULL, 0, 0,
fmt, arg1, arg2);
if (res < 0) {
xmlIOErrMemory();
return(XML_ERR_NO_MEMORY);
}
return(code);
}
/**
* xmlIOErr:
* @code: the error number
* @extra: extra information
*
* Handle an I/O error
*/
static int
xmlIOErr(int code, const char *extra)
{
return(__xmlIOErr(XML_FROM_IO, code, extra));
}
/************************************************************************
* *
* Standard I/O for file accesses *
* *
************************************************************************/
#ifdef HAVE_STAT
#if defined(_MSC_VER) && _MSC_VER >= 1500
typedef struct _stat64 _stat_t;
#else
typedef struct stat _stat_t;
#endif
#endif
#if defined(_WIN32)
/**
* __xmlIOWin32UTF8ToWChar:
* @u8String: uft-8 string
*
* Convert a string from utf-8 to wchar (WINDOWS ONLY!)
*/
static wchar_t *
__xmlIOWin32UTF8ToWChar(const char *u8String)
{
wchar_t *wString = NULL;
int i;
if (u8String) {
int wLen =
MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, u8String,
-1, NULL, 0);
if (wLen) {
wString = xmlMalloc(wLen * sizeof(wchar_t));
if (wString) {
if (MultiByteToWideChar
(CP_UTF8, 0, u8String, -1, wString, wLen) == 0) {
xmlFree(wString);
wString = NULL;
}
}
/*
* Convert to backward slash
*/
for (i = 0; wString[i] != 0; i++) {
if (wString[i] == '/')
wString[i] = '\\';
}
}
}
return wString;
}
#endif
/**
* xmlNormalizeWindowsPath:
* @path: the input file path
*
* DEPRECATED: This never really worked.
*
* Returns a copy of path.
*/
xmlChar *
xmlNormalizeWindowsPath(const xmlChar *path)
{
return xmlStrdup(path);
}
/**
* xmlCheckFilename:
* @path: the path to check
*
* DEPRECATED: Internal function, don't use.
*
* if stat is not available on the target machine,
* returns 1. if stat fails, returns 0 (if calling
* stat on the filename fails, it can't be right).
* if stat succeeds and the file is a directory,
* returns 2. otherwise returns 1.
*/
int
xmlCheckFilename(const char *path)
{
#ifdef HAVE_STAT
#if defined(_MSC_VER) && _MSC_VER >= 1500
struct _stat64 stat_buffer;
#else
struct stat stat_buffer;
#endif
int res;
#endif
if (path == NULL)
return(0);
#ifdef HAVE_STAT
#if defined(_WIN32)
{
wchar_t *wpath;
/*
* On Windows stat and wstat do not work with long pathname,
* which start with '\\?\'
*/
if ((path[0] == '\\') && (path[1] == '\\') && (path[2] == '?') &&
(path[3] == '\\') )
return 1;
wpath = __xmlIOWin32UTF8ToWChar(path);
if (wpath == NULL)
return(0);
#if defined(_MSC_VER) && _MSC_VER >= 1500
res = _wstat64(wpath, &stat_buffer);
#else
res = _wstat(wpath, &stat_buffer);
#endif
xmlFree(wpath);
}
#else
res = stat(path, &stat_buffer);
#endif
if (res < 0)
return 0;
#ifdef S_ISDIR
if (S_ISDIR(stat_buffer.st_mode))
return 2;
#endif
#endif /* HAVE_STAT */
return 1;
}
static int
xmlConvertUriToPath(const char *uri, char **out) {
const char *escaped;
char *unescaped;
*out = NULL;
if (!xmlStrncasecmp(BAD_CAST uri, BAD_CAST "file://localhost/", 17)) {
escaped = &uri[16];
} else if (!xmlStrncasecmp(BAD_CAST uri, BAD_CAST "file:///", 8)) {
escaped = &uri[7];
} else if (!xmlStrncasecmp(BAD_CAST uri, BAD_CAST "file:/", 6)) {
/* lots of generators seems to lazy to read RFC 1738 */
escaped = &uri[5];
} else {
return(1);
}
#ifdef _WIN32
/* Ignore slash like in file:///C:/file.txt */
escaped += 1;
#endif
unescaped = xmlURIUnescapeString(escaped, 0, NULL);
if (unescaped == NULL)
return(-1);
*out = unescaped;
return(0);
}
/**
* xmlFdOpen:
* @filename: the URI for matching
* @out: pointer to resulting context
*
* Returns an xmlParserErrors code
*/
static int
xmlFdOpen(const char *filename, int write, int *out) {
char *fromUri = NULL;
int flags;
int fd;
int ret;
*out = -1;
if (filename == NULL)
return(XML_ERR_ARGUMENT);
if (xmlConvertUriToPath(filename, &fromUri) < 0)
return(XML_ERR_NO_MEMORY);
if (fromUri != NULL)
filename = fromUri;
#if defined(_WIN32)
{
wchar_t *wpath;
wpath = __xmlIOWin32UTF8ToWChar(filename);
if (wpath == NULL) {
xmlFree(fromUri);
return(XML_ERR_NO_MEMORY);
}
if (write)
flags = _O_WRONLY | _O_CREAT | _O_TRUNC;
else
flags = _O_RDONLY;
fd = _wopen(wpath, flags | _O_BINARY, 0666);
xmlFree(wpath);
}
#else
if (write)
flags = O_WRONLY | O_CREAT | O_TRUNC;
else
flags = O_RDONLY;
fd = open(filename, flags, 0666);
#endif /* WIN32 */
if (fd < 0) {
/*
* Windows and possibly other platforms return EINVAL
* for invalid filenames.
*/
if ((errno == ENOENT) || (errno == EINVAL)) {
ret = XML_IO_ENOENT;
} else {
/*
* This error won't be forwarded to the parser context
* which will report it a second time.
*/
ret = xmlIOErr(0, filename);
}
} else {
*out = fd;
ret = XML_ERR_OK;
}
xmlFree(fromUri);
return(ret);
}
/**
* xmlFdRead:
* @context: the I/O context
* @buffer: where to drop data
* @len: number of bytes to read
*
* Read @len bytes to @buffer from the I/O channel.
*
* Returns the number of bytes read
*/
static int
xmlFdRead(void *context, char *buffer, int len) {
int fd = (int) (ptrdiff_t) context;
int ret = 0;
int bytes;
while (len > 0) {
bytes = read(fd, buffer, len);
if (bytes < 0) {
/*
* If we already got some bytes, return them without
* raising an error.
*/
if (ret > 0)
break;
return(-xmlIOErr(0, "read()"));
}
if (bytes == 0)
break;
ret += bytes;
buffer += bytes;
len -= bytes;
}
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlFdWrite:
* @context: the I/O context
* @buffer: where to get data
* @len: number of bytes to write
*
* Write @len bytes from @buffer to the I/O channel.
*
* Returns the number of bytes written
*/
static int
xmlFdWrite(void *context, const char *buffer, int len) {
int fd = (int) (ptrdiff_t) context;
int ret = 0;
int bytes;
while (len > 0) {
bytes = write(fd, buffer, len);
if (bytes < 0)
return(-xmlIOErr(0, "write()"));
ret += bytes;
buffer += bytes;
len -= bytes;
}
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlFdClose:
* @context: the I/O context
*
* Close an I/O channel
*
* Returns 0 in case of success and error code otherwise
*/
static int
xmlFdClose (void * context) {
int ret;
ret = close((int) (ptrdiff_t) context);
if (ret < 0)
return(xmlIOErr(0, "close()"));
return(XML_ERR_OK);
}
/**
* xmlFileMatch:
* @filename: the URI for matching
*
* DEPRECATED: Internal function, don't use.
*
* Returns 1 if matches, 0 otherwise
*/
int
xmlFileMatch (const char *filename ATTRIBUTE_UNUSED) {
return(1);
}
/**
* xmlFileOpenSafe:
* @filename: the URI for matching
* @out: pointer to resulting context
*
* input from FILE *
*
* Returns an I/O context or NULL in case of error
*/
static int
xmlFileOpenSafe(const char *filename, int write, void **out) {
char *fromUri = NULL;
FILE *fd;
int ret = XML_ERR_OK;
*out = NULL;
if (filename == NULL)
return(XML_ERR_ARGUMENT);
if (xmlConvertUriToPath(filename, &fromUri) < 0)
return(XML_ERR_NO_MEMORY);
if (fromUri != NULL)
filename = fromUri;
#if defined(_WIN32)
{
wchar_t *wpath;
wpath = __xmlIOWin32UTF8ToWChar(filename);
if (wpath == NULL) {
xmlFree(fromUri);
return(XML_ERR_NO_MEMORY);
}
fd = _wfopen(wpath, write ? L"wb" : L"rb");
xmlFree(wpath);
}
#else
fd = fopen(filename, write ? "wb" : "rb");
#endif /* WIN32 */
if (fd == NULL) {
/*
* Windows and possibly other platforms return EINVAL
* for invalid filenames.
*/
if ((errno == ENOENT) || (errno == EINVAL)) {
ret = XML_IO_ENOENT;
} else {
/*
* This error won't be forwarded to the parser context
* which will report it a second time.
*/
ret = xmlIOErr(0, filename);
}
}
*out = fd;
xmlFree(fromUri);
return(ret);
}
/**
* xmlFileOpen:
* @filename: the URI for matching
*
* DEPRECATED: Internal function, don't use.
*
* Returns an IO context or NULL in case or failure
*/
void *
xmlFileOpen(const char *filename) {
void *context;
xmlFileOpenSafe(filename, 0, &context);
return(context);
}
/**
* xmlFileRead:
* @context: the I/O context
* @buffer: where to drop data
* @len: number of bytes to write
*
* DEPRECATED: Internal function, don't use.
*
* Returns the number of bytes read or < 0 in case of failure
*/
int
xmlFileRead(void * context, char * buffer, int len) {
FILE *file = context;
size_t bytes;
if ((context == NULL) || (buffer == NULL))
return(-1);
/*
* The C standard doesn't mandate that fread sets errno, only
* POSIX does. The Windows documentation isn't really clear.
* Set errno to zero which will be reported as unknown error
* if fread fails without setting errno.
*/
errno = 0;
bytes = fread(buffer, 1, len, file);
if ((bytes < (size_t) len) && (ferror(file)))
return(-xmlIOErr(0, "fread()"));
return(bytes);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlFileWrite:
* @context: the I/O context
* @buffer: where to drop data
* @len: number of bytes to write
*
* Write @len bytes from @buffer to the I/O channel.
*
* Returns the number of bytes written
*/
static int
xmlFileWrite(void *context, const char *buffer, int len) {
FILE *file = context;
size_t bytes;
if ((context == NULL) || (buffer == NULL))
return(-1);
errno = 0;
bytes = fwrite(buffer, 1, len, file);
if (bytes < (size_t) len)
return(-xmlIOErr(0, "fwrite()"));
return(len);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlFileFlush:
* @context: the I/O context
*
* Flush an I/O channel
*/
static int
xmlFileFlush (void * context) {
FILE *file = context;
if (file == NULL)
return(-1);
if (fflush(file) != 0)
return(xmlIOErr(0, "fflush()"));
return(XML_ERR_OK);
}
/**
* xmlFileClose:
* @context: the I/O context
*
* DEPRECATED: Internal function, don't use.
*
* Returns 0 or -1 an error code case of error
*/
int
xmlFileClose (void * context) {
FILE *file = context;
if (context == NULL)
return(-1);
if (file == stdin)
return(0);
if ((file == stdout) || (file == stderr))
return(xmlFileFlush(file));
if (fclose(file) != 0)
return(xmlIOErr(0, "fclose()"));
return(0);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlBufferWrite:
* @context: the xmlBuffer
* @buffer: the data to write
* @len: number of bytes to write
*
* Write @len bytes from @buffer to the xml buffer
*
* Returns the number of bytes written or a negative xmlParserErrors
* value.
*/
static int
xmlBufferWrite (void * context, const char * buffer, int len) {
int ret;
ret = xmlBufferAdd((xmlBufferPtr) context, (const xmlChar *) buffer, len);
if (ret != 0)
return(-XML_ERR_NO_MEMORY);
return(len);
}
#endif
#ifdef LIBXML_ZLIB_ENABLED
/************************************************************************
* *
* I/O for compressed file accesses *
* *
************************************************************************/
/**
* xmlGzfileRead:
* @context: the I/O context
* @buffer: where to drop data
* @len: number of bytes to write
*
* Read @len bytes to @buffer from the compressed I/O channel.
*
* Returns the number of bytes read.
*/
static int
xmlGzfileRead (void * context, char * buffer, int len) {
int ret;
ret = gzread((gzFile) context, &buffer[0], len);
if (ret < 0) xmlIOErr(0, "gzread()");
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlGzfileWrite:
* @context: the I/O context
* @buffer: where to drop data
* @len: number of bytes to write
*
* Write @len bytes from @buffer to the compressed I/O channel.
*
* Returns the number of bytes written
*/
static int
xmlGzfileWrite (void * context, const char * buffer, int len) {
int ret;
ret = gzwrite((gzFile) context, (char *) &buffer[0], len);
if (ret < 0) xmlIOErr(0, "gzwrite()");
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlGzfileClose:
* @context: the I/O context
*
* Close a compressed I/O channel
*/
static int
xmlGzfileClose (void * context) {
int ret;
ret = (gzclose((gzFile) context) == Z_OK ) ? 0 : -1;
if (ret < 0) xmlIOErr(0, "gzclose()");
return(ret);
}
#endif /* LIBXML_ZLIB_ENABLED */
/************************************************************************
* *
* I/O for compressed file accesses *
* *
************************************************************************/
#ifdef LIBXML_LZMA_ENABLED
#include "private/xzlib.h"
/**
* xmlXzfileRead:
* @context: the I/O context
* @buffer: where to drop data
* @len: number of bytes to write
*
* Read @len bytes to @buffer from the compressed I/O channel.
*
* Returns the number of bytes written
*/
static int
xmlXzfileRead (void * context, char * buffer, int len) {
int ret;
ret = __libxml2_xzread((xzFile) context, &buffer[0], len);
if (ret < 0) xmlIOErr(0, "xzread()");
return(ret);
}
/**
* xmlXzfileClose:
* @context: the I/O context
*
* Close a compressed I/O channel
*/
static int
xmlXzfileClose (void * context) {
int ret;
ret = (__libxml2_xzclose((xzFile) context) == LZMA_OK ) ? 0 : -1;
if (ret < 0) xmlIOErr(0, "xzclose()");
return(ret);