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libxml2/xmlIO.c
Nick Wellnhofer a221cd7849 buf: Rework xmlBuf code 
Always use what the old implementation called the "IO" allocation
scheme, allowing to move the content pointer past the initial
allocation. This is inexpensive and allows efficient shrinking.

Optimize xmlBufGrow, reusing shrunken memory as much as possible.

Simplify xmlBufAdd.

Make xmlBufBackToBuffer return an error on overflow.

Make "size" exclude the terminating NULL byte.

Always provide an initial size.

Reintroduce static buffers.

Remove xmlBufResize and several other functions.
2024-07-16 17:42:10 +02:00

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/*
* xmlIO.c : implementation of the I/O interfaces used by the parser
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <io.h>
#include <direct.h>
#else
#include <unistd.h>
#endif
#ifdef LIBXML_ZLIB_ENABLED
#include <zlib.h>
#endif
#ifdef LIBXML_LZMA_ENABLED
#include <lzma.h>
#endif
#include <libxml/xmlIO.h>
#include <libxml/xmlmemory.h>
#include <libxml/uri.h>
#include <libxml/nanohttp.h>
#include <libxml/parserInternals.h>
#include <libxml/xmlerror.h>
#ifdef LIBXML_CATALOG_ENABLED
#include <libxml/catalog.h>
#endif
#include "private/buf.h"
#include "private/enc.h"
#include "private/entities.h"
#include "private/error.h"
#include "private/io.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 *
* *
************************************************************************/
/**
* xmlIOErr:
* @code: the error number
*
* Convert errno to xmlParserErrors.
*
* Returns an xmlParserErrors code.
*/
static int
xmlIOErr(int err)
{
int code;
if (err == 0) code = XML_IO_UNKNOWN;
#ifdef EACCES
else if (err == EACCES) code = XML_IO_EACCES;
#endif
#ifdef EAGAIN
else if (err == EAGAIN) code = XML_IO_EAGAIN;
#endif
#ifdef EBADF
else if (err == EBADF) code = XML_IO_EBADF;
#endif
#ifdef EBADMSG
else if (err == EBADMSG) code = XML_IO_EBADMSG;
#endif
#ifdef EBUSY
else if (err == EBUSY) code = XML_IO_EBUSY;
#endif
#ifdef ECANCELED
else if (err == ECANCELED) code = XML_IO_ECANCELED;
#endif
#ifdef ECHILD
else if (err == ECHILD) code = XML_IO_ECHILD;
#endif
#ifdef EDEADLK
else if (err == EDEADLK) code = XML_IO_EDEADLK;
#endif
#ifdef EDOM
else if (err == EDOM) code = XML_IO_EDOM;
#endif
#ifdef EEXIST
else if (err == EEXIST) code = XML_IO_EEXIST;
#endif
#ifdef EFAULT
else if (err == EFAULT) code = XML_IO_EFAULT;
#endif
#ifdef EFBIG
else if (err == EFBIG) code = XML_IO_EFBIG;
#endif
#ifdef EINPROGRESS
else if (err == EINPROGRESS) code = XML_IO_EINPROGRESS;
#endif
#ifdef EINTR
else if (err == EINTR) code = XML_IO_EINTR;
#endif
#ifdef EINVAL
else if (err == EINVAL) code = XML_IO_EINVAL;
#endif
#ifdef EIO
else if (err == EIO) code = XML_IO_EIO;
#endif
#ifdef EISDIR
else if (err == EISDIR) code = XML_IO_EISDIR;
#endif
#ifdef EMFILE
else if (err == EMFILE) code = XML_IO_EMFILE;
#endif
#ifdef EMLINK
else if (err == EMLINK) code = XML_IO_EMLINK;
#endif
#ifdef EMSGSIZE
else if (err == EMSGSIZE) code = XML_IO_EMSGSIZE;
#endif
#ifdef ENAMETOOLONG
else if (err == ENAMETOOLONG) code = XML_IO_ENAMETOOLONG;
#endif
#ifdef ENFILE
else if (err == ENFILE) code = XML_IO_ENFILE;
#endif
#ifdef ENODEV
else if (err == ENODEV) code = XML_IO_ENODEV;
#endif
#ifdef ENOENT
else if (err == ENOENT) code = XML_IO_ENOENT;
#endif
#ifdef ENOEXEC
else if (err == ENOEXEC) code = XML_IO_ENOEXEC;
#endif
#ifdef ENOLCK
else if (err == ENOLCK) code = XML_IO_ENOLCK;
#endif
#ifdef ENOMEM
else if (err == ENOMEM) code = XML_IO_ENOMEM;
#endif
#ifdef ENOSPC
else if (err == ENOSPC) code = XML_IO_ENOSPC;
#endif
#ifdef ENOSYS
else if (err == ENOSYS) code = XML_IO_ENOSYS;
#endif
#ifdef ENOTDIR
else if (err == ENOTDIR) code = XML_IO_ENOTDIR;
#endif
#ifdef ENOTEMPTY
else if (err == ENOTEMPTY) code = XML_IO_ENOTEMPTY;
#endif
#ifdef ENOTSUP
else if (err == ENOTSUP) code = XML_IO_ENOTSUP;
#endif
#ifdef ENOTTY
else if (err == ENOTTY) code = XML_IO_ENOTTY;
#endif
#ifdef ENXIO
else if (err == ENXIO) code = XML_IO_ENXIO;
#endif
#ifdef EPERM
else if (err == EPERM) code = XML_IO_EPERM;
#endif
#ifdef EPIPE
else if (err == EPIPE) code = XML_IO_EPIPE;
#endif
#ifdef ERANGE
else if (err == ERANGE) code = XML_IO_ERANGE;
#endif
#ifdef EROFS
else if (err == EROFS) code = XML_IO_EROFS;
#endif
#ifdef ESPIPE
else if (err == ESPIPE) code = XML_IO_ESPIPE;
#endif
#ifdef ESRCH
else if (err == ESRCH) code = XML_IO_ESRCH;
#endif
#ifdef ETIMEDOUT
else if (err == ETIMEDOUT) code = XML_IO_ETIMEDOUT;
#endif
#ifdef EXDEV
else if (err == EXDEV) code = XML_IO_EXDEV;
#endif
#ifdef ENOTSOCK
else if (err == ENOTSOCK) code = XML_IO_ENOTSOCK;
#endif
#ifdef EISCONN
else if (err == EISCONN) code = XML_IO_EISCONN;
#endif
#ifdef ECONNREFUSED
else if (err == ECONNREFUSED) code = XML_IO_ECONNREFUSED;
#endif
#ifdef ETIMEDOUT
else if (err == ETIMEDOUT) code = XML_IO_ETIMEDOUT;
#endif
#ifdef ENETUNREACH
else if (err == ENETUNREACH) code = XML_IO_ENETUNREACH;
#endif
#ifdef EADDRINUSE
else if (err == EADDRINUSE) code = XML_IO_EADDRINUSE;
#endif
#ifdef EINPROGRESS
else if (err == EINPROGRESS) code = XML_IO_EINPROGRESS;
#endif
#ifdef EALREADY
else if (err == EALREADY) code = XML_IO_EALREADY;
#endif
#ifdef EAFNOSUPPORT
else if (err == EAFNOSUPPORT) code = XML_IO_EAFNOSUPPORT;
#endif
else code = XML_IO_UNKNOWN;
return(code);
}
/************************************************************************
* *
* Standard I/O for file accesses *
* *
************************************************************************/
#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)
{
#if defined(_WIN32)
struct _stat stat_buffer;
#else
struct stat stat_buffer;
#endif
int res;
if (path == NULL)
return(0);
#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);
res = _wstat(wpath, &stat_buffer);
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
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, 0777);
xmlFree(wpath);
}
#else
if (write)
flags = O_WRONLY | O_CREAT | O_TRUNC;
else
flags = O_RDONLY;
fd = open(filename, flags, 0777);
#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 {
ret = xmlIOErr(errno);
}
} 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(errno));
}
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(errno));
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(errno));
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(errno);
}
}
*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(errno));
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(errno));
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(errno));
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(errno));
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)
return(-XML_IO_UNKNOWN);
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)
return(-XML_IO_UNKNOWN);
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlGzfileClose:
* @context: the I/O context
*
* Close a compressed I/O channel
*/
static int
xmlGzfileClose (void * context) {
if (gzclose((gzFile) context) != Z_OK)
return(XML_IO_UNKNOWN);
return(0);
}
#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)
return(-XML_IO_UNKNOWN);
return(ret);
}
/**
* xmlXzfileClose:
* @context: the I/O context
*
* Close a compressed I/O channel
*/
static int
xmlXzfileClose (void * context) {
if (__libxml2_xzclose((xzFile) context) != LZMA_OK)
return(XML_IO_UNKNOWN);
return(0);
}
#endif /* LIBXML_LZMA_ENABLED */
/************************************************************************
* *
* I/O for HTTP file accesses *
* *
************************************************************************/
#ifdef LIBXML_HTTP_ENABLED
/**
* xmlIOHTTPMatch:
* @filename: the URI for matching
*
* DEPRECATED: Internal function, don't use.
*
* check if the URI matches an HTTP one
*
* Returns 1 if matches, 0 otherwise
*/
int
xmlIOHTTPMatch (const char *filename) {
if (!xmlStrncasecmp(BAD_CAST filename, BAD_CAST "http://", 7))
return(1);
return(0);
}
/**
* xmlIOHTTPOpen:
* @filename: the URI for matching
*
* DEPRECATED: Internal function, don't use.
*
* open an HTTP I/O channel
*
* Returns an I/O context or NULL in case of error
*/
void *
xmlIOHTTPOpen (const char *filename) {
return(xmlNanoHTTPOpen(filename, NULL));
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlIOHTTPOpenW:
* @post_uri: The destination URI for the document
* @compression: The compression desired for the document.
*
* DEPRECATED: Support for HTTP POST has been removed.
*
* Returns NULL.
*/
void *
xmlIOHTTPOpenW(const char *post_uri ATTRIBUTE_UNUSED,
int compression ATTRIBUTE_UNUSED)
{
return(NULL);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlIOHTTPRead:
* @context: the I/O context
* @buffer: where to drop data
* @len: number of bytes to write
*
* DEPRECATED: Internal function, don't use.
*
* Read @len bytes to @buffer from the I/O channel.
*
* Returns the number of bytes written
*/
int
xmlIOHTTPRead(void * context, char * buffer, int len) {
if ((buffer == NULL) || (len < 0)) return(-1);
return(xmlNanoHTTPRead(context, &buffer[0], len));
}
/**
* xmlIOHTTPClose:
* @context: the I/O context
*
* DEPRECATED: Internal function, don't use.
*
* Close an HTTP I/O channel
*
* Returns 0
*/
int
xmlIOHTTPClose (void * context) {
xmlNanoHTTPClose(context);
return 0;
}
#endif /* LIBXML_HTTP_ENABLED */
/************************************************************************
* *
* Input/output buffers *
* *
************************************************************************/
static int
xmlIODefaultMatch(const char *filename ATTRIBUTE_UNUSED) {
return(1);
}
/**
* xmlInputDefaultOpen:
* @buf: input buffer to be filled
* @filename: filename or URI
* @flags: XML_INPUT flags
*
* Returns an xmlParserErrors code.
*/
static int
xmlInputDefaultOpen(xmlParserInputBufferPtr buf, const char *filename,
int flags) {
int ret;
int fd;
/* Avoid unused variable warning */
(void) flags;
#ifdef LIBXML_HTTP_ENABLED
if (xmlIOHTTPMatch(filename)) {
if ((flags & XML_INPUT_NETWORK) == 0)
return(XML_IO_NETWORK_ATTEMPT);
buf->context = xmlIOHTTPOpen(filename);
if (buf->context != NULL) {
buf->readcallback = xmlIOHTTPRead;
buf->closecallback = xmlIOHTTPClose;
return(XML_ERR_OK);
}
}
#endif /* LIBXML_HTTP_ENABLED */
if (!xmlFileMatch(filename))
return(XML_IO_ENOENT);
#ifdef LIBXML_LZMA_ENABLED
if (flags & XML_INPUT_UNZIP) {
xzFile xzStream;
ret = xmlFdOpen(filename, 0, &fd);
if (ret != XML_ERR_OK)
return(ret);
xzStream = __libxml2_xzdopen(filename, fd, "rb");
if (xzStream == NULL) {
close(fd);
} else {
if (__libxml2_xzcompressed(xzStream) > 0) {
buf->context = xzStream;
buf->readcallback = xmlXzfileRead;
buf->closecallback = xmlXzfileClose;
buf->compressed = 1;
return(XML_ERR_OK);
}
xmlXzfileClose(xzStream);
}
}
#endif /* LIBXML_LZMA_ENABLED */
#ifdef LIBXML_ZLIB_ENABLED
if (flags & XML_INPUT_UNZIP) {
gzFile gzStream;
ret = xmlFdOpen(filename, 0, &fd);
if (ret != XML_ERR_OK)
return(ret);
gzStream = gzdopen(fd, "rb");
if (gzStream == NULL) {
close(fd);
} else {
char buff4[4];
if ((gzread(gzStream, buff4, 4) > 0) &&
(gzdirect(gzStream) == 0)) {
gzrewind(gzStream);
buf->context = gzStream;
buf->readcallback = xmlGzfileRead;
buf->closecallback = xmlGzfileClose;
buf->compressed = 1;
return(XML_ERR_OK);
}
xmlGzfileClose(gzStream);
}
}
#endif /* LIBXML_ZLIB_ENABLED */
ret = xmlFdOpen(filename, 0, &fd);
if (ret != XML_ERR_OK)
return(ret);
buf->context = (void *) (ptrdiff_t) fd;
buf->readcallback = xmlFdRead;
buf->closecallback = xmlFdClose;
return(XML_ERR_OK);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlOutputDefaultOpen:
* @buf: input buffer to be filled
* @filename: filename or URI
* @compression: compression level or 0
* @is_file_uri: whether filename is a file URI
*
* Returns an xmlParserErrors code.
*/
static int
xmlOutputDefaultOpen(xmlOutputBufferPtr buf, const char *filename,
int compression) {
int fd;
(void) compression;
if (!strcmp(filename, "-")) {
fd = dup(STDOUT_FILENO);
if (fd < 0)
return(xmlIOErr(errno));
} else {
int ret;
ret = xmlFdOpen(filename, /* write */ 1, &fd);
if (ret != XML_ERR_OK)
return(ret);
}
#ifdef LIBXML_ZLIB_ENABLED
if ((compression > 0) && (compression <= 9)) {
gzFile gzStream;
char mode[15];
snprintf(mode, sizeof(mode), "wb%d", compression);
gzStream = gzdopen(fd, mode);
if (gzStream == NULL) {
close(fd);
return(XML_IO_UNKNOWN);
}
buf->context = gzStream;
buf->writecallback = xmlGzfileWrite;
buf->closecallback = xmlGzfileClose;
return(XML_ERR_OK);
}
#endif /* LIBXML_ZLIB_ENABLED */
buf->context = (void *) (ptrdiff_t) fd;
buf->writecallback = xmlFdWrite;
buf->closecallback = xmlFdClose;
return(XML_ERR_OK);
}
#endif
/**
* xmlAllocParserInputBuffer:
* @enc: the charset encoding if known (deprecated)
*
* DEPRECATED: Use xmlNewInputFrom*.
*
* Create a buffered parser input for progressive parsing.
*
* The encoding argument is deprecated and should be set to
* XML_CHAR_ENCODING_NONE. The encoding can be changed with
* xmlSwitchEncoding or xmlSwitchEncodingName later on.
*
* Returns the new parser input or NULL
*/
xmlParserInputBufferPtr
xmlAllocParserInputBuffer(xmlCharEncoding enc) {
xmlParserInputBufferPtr ret;
ret = (xmlParserInputBufferPtr) xmlMalloc(sizeof(xmlParserInputBuffer));
if (ret == NULL) {
return(NULL);
}
memset(ret, 0, sizeof(xmlParserInputBuffer));
ret->buffer = xmlBufCreate(INPUT_CHUNK + MINLEN + 80 /* LINE_LEN */);
if (ret->buffer == NULL) {
xmlFree(ret);
return(NULL);
}
if (enc != XML_CHAR_ENCODING_NONE) {
if (xmlLookupCharEncodingHandler(enc, &ret->encoder) != 0) {
/* We can't handle errors properly here. */
xmlFreeParserInputBuffer(ret);
return(NULL);
}
}
if (ret->encoder != NULL)
ret->raw = xmlBufCreate(MINLEN);
else
ret->raw = NULL;
ret->readcallback = NULL;
ret->closecallback = NULL;
ret->context = NULL;
ret->compressed = -1;
ret->rawconsumed = 0;
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlAllocOutputBuffer:
* @encoder: the encoding converter or NULL
*
* Create a buffered parser output
*
* Returns the new parser output or NULL
*/
xmlOutputBufferPtr
xmlAllocOutputBuffer(xmlCharEncodingHandlerPtr encoder) {
xmlOutputBufferPtr ret;
ret = (xmlOutputBufferPtr) xmlMalloc(sizeof(xmlOutputBuffer));
if (ret == NULL) {
return(NULL);
}
memset(ret, 0, sizeof(xmlOutputBuffer));
ret->buffer = xmlBufCreate(MINLEN);
if (ret->buffer == NULL) {
xmlFree(ret);
return(NULL);
}
ret->encoder = encoder;
if (encoder != NULL) {
ret->conv = xmlBufCreate(MINLEN);
if (ret->conv == NULL) {
xmlBufFree(ret->buffer);
xmlFree(ret);
return(NULL);
}
/*
* This call is designed to initiate the encoder state
*/
xmlCharEncOutput(ret, 1);
} else
ret->conv = NULL;
ret->writecallback = NULL;
ret->closecallback = NULL;
ret->context = NULL;
ret->written = 0;
return(ret);
}
/**
* xmlAllocOutputBufferInternal:
* @encoder: the encoding converter or NULL
*
* Create a buffered parser output
*
* Returns the new parser output or NULL
*/
xmlOutputBufferPtr
xmlAllocOutputBufferInternal(xmlCharEncodingHandlerPtr encoder) {
xmlOutputBufferPtr ret;
ret = (xmlOutputBufferPtr) xmlMalloc(sizeof(xmlOutputBuffer));
if (ret == NULL) {
return(NULL);
}
memset(ret, 0, sizeof(xmlOutputBuffer));
ret->buffer = xmlBufCreate(MINLEN);
if (ret->buffer == NULL) {
xmlFree(ret);
return(NULL);
}
ret->encoder = encoder;
if (encoder != NULL) {
ret->conv = xmlBufCreate(MINLEN);
if (ret->conv == NULL) {
xmlBufFree(ret->buffer);
xmlFree(ret);
return(NULL);
}
/*
* This call is designed to initiate the encoder state
*/
xmlCharEncOutput(ret, 1);
} else
ret->conv = NULL;
ret->writecallback = NULL;
ret->closecallback = NULL;
ret->context = NULL;
ret->written = 0;
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlFreeParserInputBuffer:
* @in: a buffered parser input
*
* Free up the memory used by a buffered parser input
*/
void
xmlFreeParserInputBuffer(xmlParserInputBufferPtr in) {
if (in == NULL) return;
if (in->raw) {
xmlBufFree(in->raw);
in->raw = NULL;
}
if (in->encoder != NULL) {
xmlCharEncCloseFunc(in->encoder);
}
if (in->closecallback != NULL) {
in->closecallback(in->context);
}
if (in->buffer != NULL) {
xmlBufFree(in->buffer);
in->buffer = NULL;
}
xmlFree(in);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlOutputBufferClose:
* @out: a buffered output
*
* flushes and close the output I/O channel
* and free up all the associated resources
*
* Returns the number of byte written or a negative xmlParserErrors
* code in case of error.
*/
int
xmlOutputBufferClose(xmlOutputBufferPtr out)
{
int ret;
if (out == NULL)
return (-1);
if (out->writecallback != NULL)
xmlOutputBufferFlush(out);
if (out->closecallback != NULL) {
int code = out->closecallback(out->context);
if ((code != XML_ERR_OK) && (out->error == XML_ERR_OK)) {
if (code < 0)
out->error = XML_IO_UNKNOWN;
else
out->error = code;
}
}
if (out->error != XML_ERR_OK)
ret = -out->error;
else
ret = out->written;
if (out->conv) {
xmlBufFree(out->conv);
out->conv = NULL;
}
if (out->encoder != NULL) {
xmlCharEncCloseFunc(out->encoder);
}
if (out->buffer != NULL) {
xmlBufFree(out->buffer);
out->buffer = NULL;
}
xmlFree(out);
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlParserInputBufferCreateUrl:
* @URI: the filename or URI
* @enc: encoding enum (deprecated)
* @flags: XML_INPUT flags
* @out: pointer to resulting input buffer
*
* Returns an xmlParserErrors code.
*/
int
xmlParserInputBufferCreateUrl(const char *URI, xmlCharEncoding enc,
int flags, xmlParserInputBufferPtr *out) {
xmlParserInputBufferPtr buf;
int ret;
int i;
*out = NULL;
if (URI == NULL)
return(XML_ERR_ARGUMENT);
/*
* Allocate the Input buffer front-end.
*/
buf = xmlAllocParserInputBuffer(enc);
if (buf == NULL)
return(XML_ERR_NO_MEMORY);
/*
* Try to find one of the input accept method accepting that scheme
* Go in reverse to give precedence to user defined handlers.
*/
ret = XML_IO_ENOENT;
for (i = xmlInputCallbackNr - 1; i >= 0; i--) {
xmlInputCallback *cb = &xmlInputCallbackTable[i];
if (cb->matchcallback == xmlIODefaultMatch) {
ret = xmlInputDefaultOpen(buf, URI, flags);
if ((ret == XML_ERR_OK) || (ret != XML_IO_ENOENT))
break;
} else if ((cb->matchcallback != NULL) &&
(cb->matchcallback(URI) != 0)) {
buf->context = cb->opencallback(URI);
if (buf->context != NULL) {
buf->readcallback = cb->readcallback;
buf->closecallback = cb->closecallback;
ret = XML_ERR_OK;
break;
}
}
}
if (ret != XML_ERR_OK) {
xmlFreeParserInputBuffer(buf);
*out = NULL;
return(ret);
}
*out = buf;
return(ret);
}
xmlParserInputBufferPtr
__xmlParserInputBufferCreateFilename(const char *URI, xmlCharEncoding enc) {
xmlParserInputBufferPtr ret;
xmlParserInputBufferCreateUrl(URI, enc, 0, &ret);
return(ret);
}
/**
* xmlParserInputBufferCreateFilename:
* @URI: a C string containing the URI or filename
* @enc: the charset encoding if known
*
* DEPRECATED: Use xmlNewInputFromUrl.
*
* Create a buffered parser input for the progressive parsing of a file
* Automatic support for ZLIB/Compress compressed document is provided
* by default if found at compile-time.
* Do an encoding check if enc == XML_CHAR_ENCODING_NONE
*
* Returns the new parser input or NULL
*/
xmlParserInputBufferPtr
xmlParserInputBufferCreateFilename(const char *URI, xmlCharEncoding enc) {
xmlParserInputBufferPtr ret;
if (xmlParserInputBufferCreateFilenameValue != NULL)
return(xmlParserInputBufferCreateFilenameValue(URI, enc));
xmlParserInputBufferCreateUrl(URI, enc, 0, &ret);
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
xmlOutputBufferPtr
__xmlOutputBufferCreateFilename(const char *URI,
xmlCharEncodingHandlerPtr encoder,
int compression) {
xmlOutputBufferPtr ret;
xmlURIPtr puri;
int i = 0;
char *unescaped = NULL;
if (URI == NULL)
return(NULL);
puri = xmlParseURI(URI);
if (puri != NULL) {
/*
* try to limit the damages of the URI unescaping code.
*/
if (puri->scheme == NULL) {
unescaped = xmlURIUnescapeString(URI, 0, NULL);
if (unescaped == NULL) {
xmlFreeURI(puri);
return(NULL);
}
URI = unescaped;
}
xmlFreeURI(puri);
}
/*
* Allocate the Output buffer front-end.
*/
ret = xmlAllocOutputBufferInternal(encoder);
if (ret == NULL) {
xmlFree(unescaped);
return(NULL);
}
/*
* Try to find one of the output accept method accepting that scheme
* Go in reverse to give precedence to user defined handlers.
*/
for (i = xmlOutputCallbackNr - 1; i >= 0; i--) {
xmlOutputCallback *cb = &xmlOutputCallbackTable[i];
int code;
if (cb->matchcallback == xmlIODefaultMatch) {
code = xmlOutputDefaultOpen(ret, URI, compression);
/* TODO: Handle other errors */
if (code == XML_ERR_OK)
break;
} else if ((cb->matchcallback != NULL) &&
(cb->matchcallback(URI) != 0)) {
ret->context = cb->opencallback(URI);
if (ret->context != NULL) {
ret->writecallback = cb->writecallback;
ret->closecallback = cb->closecallback;
break;
}
}
}
if (ret->context == NULL) {
xmlOutputBufferClose(ret);
ret = NULL;
}
xmlFree(unescaped);
return(ret);
}
/**
* xmlOutputBufferCreateFilename:
* @URI: a C string containing the URI or filename
* @encoder: the encoding converter or NULL
* @compression: the compression ration (0 none, 9 max).
*
* Create a buffered output for the progressive saving of a file
* If filename is "-' then we use stdout as the output.
* Automatic support for ZLIB/Compress compressed document is provided
* by default if found at compile-time.
* TODO: currently if compression is set, the library only support
* writing to a local file.
*
* Returns the new output or NULL
*/
xmlOutputBufferPtr
xmlOutputBufferCreateFilename(const char *URI,
xmlCharEncodingHandlerPtr encoder,
int compression ATTRIBUTE_UNUSED) {
if ((xmlOutputBufferCreateFilenameValue)) {
return xmlOutputBufferCreateFilenameValue(URI, encoder, compression);
}
return __xmlOutputBufferCreateFilename(URI, encoder, compression);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlParserInputBufferCreateFile:
* @file: a FILE*
* @enc: the charset encoding if known (deprecated)
*
* DEPRECATED: Don't use.
*
* Create a buffered parser input for the progressive parsing of a FILE *
* buffered C I/O
*
* The encoding argument is deprecated and should be set to
* XML_CHAR_ENCODING_NONE. The encoding can be changed with
* xmlSwitchEncoding or xmlSwitchEncodingName later on.
*
* Returns the new parser input or NULL
*/
xmlParserInputBufferPtr
xmlParserInputBufferCreateFile(FILE *file, xmlCharEncoding enc) {
xmlParserInputBufferPtr ret;
if (file == NULL) return(NULL);
ret = xmlAllocParserInputBuffer(enc);
if (ret != NULL) {
ret->context = file;
ret->readcallback = xmlFileRead;
ret->closecallback = NULL;
}
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlOutputBufferCreateFile:
* @file: a FILE*
* @encoder: the encoding converter or NULL
*
* Create a buffered output for the progressive saving to a FILE *
* buffered C I/O
*
* Returns the new parser output or NULL
*/
xmlOutputBufferPtr
xmlOutputBufferCreateFile(FILE *file, xmlCharEncodingHandlerPtr encoder) {
xmlOutputBufferPtr ret;
if (file == NULL) return(NULL);
ret = xmlAllocOutputBufferInternal(encoder);
if (ret != NULL) {
ret->context = file;
ret->writecallback = xmlFileWrite;
ret->closecallback = xmlFileFlush;
}
return(ret);
}
/**
* xmlOutputBufferCreateBuffer:
* @buffer: a xmlBufferPtr
* @encoder: the encoding converter or NULL
*
* Create a buffered output for the progressive saving to a xmlBuffer
*
* Returns the new parser output or NULL
*/
xmlOutputBufferPtr
xmlOutputBufferCreateBuffer(xmlBufferPtr buffer,
xmlCharEncodingHandlerPtr encoder) {
xmlOutputBufferPtr ret;
if (buffer == NULL) return(NULL);
ret = xmlOutputBufferCreateIO(xmlBufferWrite, NULL, (void *) buffer,
encoder);
return(ret);
}
/**
* xmlOutputBufferGetContent:
* @out: an xmlOutputBufferPtr
*
* Gives a pointer to the data currently held in the output buffer
*
* Returns a pointer to the data or NULL in case of error
*/
const xmlChar *
xmlOutputBufferGetContent(xmlOutputBufferPtr out) {
if ((out == NULL) || (out->buffer == NULL) || (out->error != 0))
return(NULL);
return(xmlBufContent(out->buffer));
}
/**
* xmlOutputBufferGetSize:
* @out: an xmlOutputBufferPtr
*
* Gives the length of the data currently held in the output buffer
*
* Returns 0 in case or error or no data is held, the size otherwise
*/
size_t
xmlOutputBufferGetSize(xmlOutputBufferPtr out) {
if ((out == NULL) || (out->buffer == NULL) || (out->error != 0))
return(0);
return(xmlBufUse(out->buffer));
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlParserInputBufferCreateFd:
* @fd: a file descriptor number
* @enc: the charset encoding if known (deprecated)
*
* DEPRECATED: Use xmlNewInputFromFd.
*
* Create a buffered parser input for the progressive parsing for the input
* from a file descriptor
*
* The encoding argument is deprecated and should be set to
* XML_CHAR_ENCODING_NONE. The encoding can be changed with
* xmlSwitchEncoding or xmlSwitchEncodingName later on.
*
* Returns the new parser input or NULL
*/
xmlParserInputBufferPtr
xmlParserInputBufferCreateFd(int fd, xmlCharEncoding enc) {
xmlParserInputBufferPtr ret;
if (fd < 0) return(NULL);
ret = xmlAllocParserInputBuffer(enc);
if (ret != NULL) {
ret->context = (void *) (ptrdiff_t) fd;
ret->readcallback = xmlFdRead;
}
return(ret);
}
typedef struct {
char *mem;
const char *cur;
size_t size;
} xmlMemIOCtxt;
static int
xmlMemRead(void *vctxt, char *buf, int size) {
xmlMemIOCtxt *ctxt = vctxt;
if ((size_t) size > ctxt->size)
size = ctxt->size;
memcpy(buf, ctxt->cur, size);
ctxt->cur += size;
ctxt->size -= size;
return size;
}
static int
xmlMemClose(void *vctxt) {
xmlMemIOCtxt *ctxt = vctxt;
if (ctxt->mem != NULL)
xmlFree(ctxt->mem);
xmlFree(ctxt);
return(0);
}
/**
* xmlNewInputBufferMemory:
* @mem: memory buffer
* @size: size of buffer
* @flags: flags
* @enc: the charset encoding if known (deprecated)
*
* Create an input buffer for memory.
*
* Returns the new input buffer or NULL.
*/
xmlParserInputBufferPtr
xmlNewInputBufferMemory(const void *mem, size_t size, int flags,
xmlCharEncoding enc) {
xmlParserInputBufferPtr ret;
xmlMemIOCtxt *ctxt;
char *copy = NULL;
if ((flags & XML_INPUT_BUF_STATIC) == 0) {
if (size + 1 == 0)
return(NULL);
copy = xmlMalloc(size + 1);
if (copy == NULL)
return(NULL);
memcpy(copy, mem, size);
copy[size] = 0;
mem = copy;
}
ret = xmlAllocParserInputBuffer(enc);
if (ret == NULL) {
xmlFree(copy);
return(NULL);
}
ctxt = xmlMalloc(sizeof(*ctxt));
if (ctxt == NULL) {
xmlFreeParserInputBuffer(ret);
xmlFree(copy);
return(NULL);
}
ctxt->mem = copy;
ctxt->cur = mem;
ctxt->size = size;
ret->context = ctxt;
ret->readcallback = xmlMemRead;
ret->closecallback = xmlMemClose;
return(ret);
}
/**
* xmlParserInputBufferCreateMem:
* @mem: the memory input
* @size: the length of the memory block
* @enc: the charset encoding if known (deprecated)
*
* DEPRECATED: Use xmlNewInputFromMemory.
*
* Create a parser input buffer for parsing from a memory area.
*
* This function makes a copy of the whole input buffer. If you are sure
* that the contents of the buffer will remain valid until the document
* was parsed, you can avoid the copy by using
* xmlParserInputBufferCreateStatic.
*
* The encoding argument is deprecated and should be set to
* XML_CHAR_ENCODING_NONE. The encoding can be changed with
* xmlSwitchEncoding or xmlSwitchEncodingName later on.
*
* Returns the new parser input or NULL in case of error.
*/
xmlParserInputBufferPtr
xmlParserInputBufferCreateMem(const char *mem, int size, xmlCharEncoding enc) {
if ((mem == NULL) || (size < 0))
return(NULL);
return(xmlNewInputBufferMemory(mem, size, 0, enc));
}
/**
* xmlParserInputBufferCreateStatic:
* @mem: the memory input
* @size: the length of the memory block
* @enc: the charset encoding if known
*
* DEPRECATED: Use xmlNewInputFromMemory.
*
* Create a parser input buffer for parsing from a memory area.
*
* This functions assumes that the contents of the input buffer remain
* valid until the document was parsed. Use xmlParserInputBufferCreateMem
* otherwise.
*
* The encoding argument is deprecated and should be set to
* XML_CHAR_ENCODING_NONE. The encoding can be changed with
* xmlSwitchEncoding or xmlSwitchEncodingName later on.
*
* Returns the new parser input or NULL in case of error.
*/
xmlParserInputBufferPtr
xmlParserInputBufferCreateStatic(const char *mem, int size,
xmlCharEncoding enc) {
if ((mem == NULL) || (size < 0))
return(NULL);
return(xmlNewInputBufferMemory(mem, size, XML_INPUT_BUF_STATIC, enc));
}
typedef struct {
const char *str;
} xmlStringIOCtxt;
static int
xmlStringRead(void *vctxt, char *buf, int size) {
xmlStringIOCtxt *ctxt = vctxt;
const char *zero;
size_t len;
zero = memchr(ctxt->str, 0, size);
len = zero ? zero - ctxt->str : size;
memcpy(buf, ctxt->str, len);
ctxt->str += len;
return(len);
}
static int
xmlStringClose(void *vctxt) {
xmlFree(vctxt);
return(0);
}
/**
* xmlNewInputBufferString:
* @str: C string
* @flags: flags
*
* Create an input buffer for a null-teriminated C string.
*
* Returns the new input buffer or NULL.
*/
xmlParserInputBufferPtr
xmlNewInputBufferString(const char *str, int flags) {
xmlParserInputBufferPtr ret;
xmlStringIOCtxt *ctxt;
if ((flags & XML_INPUT_BUF_STATIC) == 0)
return(xmlNewInputBufferMemory(str, strlen(str), flags,
XML_CHAR_ENCODING_NONE));
ret = xmlAllocParserInputBuffer(XML_CHAR_ENCODING_NONE);
if (ret == NULL)
return(NULL);
ctxt = xmlMalloc(sizeof(*ctxt));
if (ctxt == NULL) {
xmlFreeParserInputBuffer(ret);
return(NULL);
}
ctxt->str = str;
ret->context = ctxt;
ret->readcallback = xmlStringRead;
ret->closecallback = xmlStringClose;
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlOutputBufferCreateFd:
* @fd: a file descriptor number
* @encoder: the encoding converter or NULL
*
* Create a buffered output for the progressive saving
* to a file descriptor
*
* Returns the new parser output or NULL
*/
xmlOutputBufferPtr
xmlOutputBufferCreateFd(int fd, xmlCharEncodingHandlerPtr encoder) {
xmlOutputBufferPtr ret;
if (fd < 0) return(NULL);
ret = xmlAllocOutputBufferInternal(encoder);
if (ret != NULL) {
ret->context = (void *) (ptrdiff_t) fd;
ret->writecallback = xmlFdWrite;
ret->closecallback = NULL;
}
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlParserInputBufferCreateIO:
* @ioread: an I/O read function
* @ioclose: an I/O close function
* @ioctx: an I/O handler
* @enc: the charset encoding if known (deprecated)
*
* DEPRECATED: Use xmlNewInputFromIO.
*
* Create a buffered parser input for the progressive parsing for the input
* from an I/O handler
*
* The encoding argument is deprecated and should be set to
* XML_CHAR_ENCODING_NONE. The encoding can be changed with
* xmlSwitchEncoding or xmlSwitchEncodingName later on.
*
* Returns the new parser input or NULL
*/
xmlParserInputBufferPtr
xmlParserInputBufferCreateIO(xmlInputReadCallback ioread,
xmlInputCloseCallback ioclose, void *ioctx, xmlCharEncoding enc) {
xmlParserInputBufferPtr ret;
if (ioread == NULL) return(NULL);
ret = xmlAllocParserInputBuffer(enc);
if (ret != NULL) {
ret->context = (void *) ioctx;
ret->readcallback = ioread;
ret->closecallback = ioclose;
}
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlOutputBufferCreateIO:
* @iowrite: an I/O write function
* @ioclose: an I/O close function
* @ioctx: an I/O handler
* @encoder: the charset encoding if known
*
* Create a buffered output for the progressive saving
* to an I/O handler
*
* Returns the new parser output or NULL
*/
xmlOutputBufferPtr
xmlOutputBufferCreateIO(xmlOutputWriteCallback iowrite,
xmlOutputCloseCallback ioclose, void *ioctx,
xmlCharEncodingHandlerPtr encoder) {
xmlOutputBufferPtr ret;
if (iowrite == NULL) return(NULL);
ret = xmlAllocOutputBufferInternal(encoder);
if (ret != NULL) {
ret->context = (void *) ioctx;
ret->writecallback = iowrite;
ret->closecallback = ioclose;
}
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlParserInputBufferCreateFilenameDefault:
* @func: function pointer to the new ParserInputBufferCreateFilenameFunc
*
* DEPRECATED: Use xmlCtxtSetResourceLoader or similar functions.
*
* Registers a callback for URI input file handling
*
* Returns the old value of the registration function
*/
xmlParserInputBufferCreateFilenameFunc
xmlParserInputBufferCreateFilenameDefault(
xmlParserInputBufferCreateFilenameFunc func)
{
xmlParserInputBufferCreateFilenameFunc old;
old = xmlParserInputBufferCreateFilenameValue;
if (old == NULL)
old = __xmlParserInputBufferCreateFilename;
if (func == __xmlParserInputBufferCreateFilename)
func = NULL;
xmlParserInputBufferCreateFilenameValue = func;
return(old);
}
/**
* xmlOutputBufferCreateFilenameDefault:
* @func: function pointer to the new OutputBufferCreateFilenameFunc
*
* Registers a callback for URI output file handling
*
* Returns the old value of the registration function
*/
xmlOutputBufferCreateFilenameFunc
xmlOutputBufferCreateFilenameDefault(xmlOutputBufferCreateFilenameFunc func)
{
xmlOutputBufferCreateFilenameFunc old = xmlOutputBufferCreateFilenameValue;
#ifdef LIBXML_OUTPUT_ENABLED
if (old == NULL) {
old = __xmlOutputBufferCreateFilename;
}
#endif
xmlOutputBufferCreateFilenameValue = func;
return(old);
}
/**
* xmlParserInputBufferPush:
* @in: a buffered parser input
* @len: the size in bytes of the array.
* @buf: an char array
*
* Push the content of the arry in the input buffer
* This routine handle the I18N transcoding to internal UTF-8
* This is used when operating the parser in progressive (push) mode.
*
* Returns the number of chars read and stored in the buffer, or -1
* in case of error.
*/
int
xmlParserInputBufferPush(xmlParserInputBufferPtr in,
int len, const char *buf) {
int nbchars = 0;
int ret;
if (len < 0) return(0);
if ((in == NULL) || (in->error)) return(-1);
if (in->encoder != NULL) {
/*
* Store the data in the incoming raw buffer
*/
if (in->raw == NULL) {
in->raw = xmlBufCreate(50);
if (in->raw == NULL) {
in->error = XML_ERR_NO_MEMORY;
return(-1);
}
}
ret = xmlBufAdd(in->raw, (const xmlChar *) buf, len);
if (ret != 0) {
in->error = XML_ERR_NO_MEMORY;
return(-1);
}
/*
* convert as much as possible to the parser reading buffer.
*/
nbchars = xmlCharEncInput(in);
if (nbchars < 0)
return(-1);
} else {
nbchars = len;
ret = xmlBufAdd(in->buffer, (xmlChar *) buf, nbchars);
if (ret != 0) {
in->error = XML_ERR_NO_MEMORY;
return(-1);
}
}
return(nbchars);
}
/**
* endOfInput:
*
* When reading from an Input channel indicated end of file or error
* don't reread from it again.
*/
static int
endOfInput (void * context ATTRIBUTE_UNUSED,
char * buffer ATTRIBUTE_UNUSED,
int len ATTRIBUTE_UNUSED) {
return(0);
}
/**
* xmlParserInputBufferGrow:
* @in: a buffered parser input
* @len: indicative value of the amount of chars to read
*
* Grow up the content of the input buffer, the old data are preserved
* This routine handle the I18N transcoding to internal UTF-8
* This routine is used when operating the parser in normal (pull) mode
*
* TODO: one should be able to remove one extra copy by copying directly
* onto in->buffer or in->raw
*
* Returns the number of chars read and stored in the buffer, or -1
* in case of error.
*/
int
xmlParserInputBufferGrow(xmlParserInputBufferPtr in, int len) {
xmlBufPtr buf;
int res = 0;
if ((in == NULL) || (in->error)) return(-1);
if ((len <= MINLEN) && (len != 4))
len = MINLEN;
if (in->encoder == NULL) {
if (in->readcallback == NULL)
return(0);
buf = in->buffer;
} else {
if (in->raw == NULL) {
in->raw = xmlBufCreate(MINLEN);
}
buf = in->raw;
}
/*
* Call the read method for this I/O type.
*/
if (in->readcallback != NULL) {
if (xmlBufGrow(buf, len + 1) < 0) {
in->error = XML_ERR_NO_MEMORY;
return(-1);
}
res = in->readcallback(in->context, (char *)xmlBufEnd(buf), len);
if (res <= 0)
in->readcallback = endOfInput;
if (res < 0) {
if (res == -1)
in->error = XML_IO_UNKNOWN;
else
in->error = -res;
return(-1);
}
if (xmlBufAddLen(buf, res) < 0) {
in->error = XML_ERR_NO_MEMORY;
return(-1);
}
}
/*
* try to establish compressed status of input if not done already
*/
if (in->compressed == -1) {
#ifdef LIBXML_LZMA_ENABLED
if (in->readcallback == xmlXzfileRead)
in->compressed = __libxml2_xzcompressed(in->context);
#endif
}
if (in->encoder != NULL) {
res = xmlCharEncInput(in);
if (res < 0)
return(-1);
}
return(res);
}
/**
* xmlParserInputBufferRead:
* @in: a buffered parser input
* @len: indicative value of the amount of chars to read
*
* Refresh the content of the input buffer, the old data are considered
* consumed
* This routine handle the I18N transcoding to internal UTF-8
*
* Returns the number of chars read and stored in the buffer, or -1
* in case of error.
*/
int
xmlParserInputBufferRead(xmlParserInputBufferPtr in, int len) {
return(xmlParserInputBufferGrow(in, len));
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlOutputBufferWrite:
* @out: a buffered parser output
* @len: the size in bytes of the array.
* @data: an char array
*
* Write the content of the array in the output I/O buffer
* This routine handle the I18N transcoding from internal UTF-8
* The buffer is lossless, i.e. will store in case of partial
* or delayed writes.
*
* Returns the number of chars immediately written, or -1
* in case of error.
*/
int
xmlOutputBufferWrite(xmlOutputBufferPtr out, int len, const char *data) {
size_t written = 0;
if ((out == NULL) || (out->error))
return(-1);
if (len < 0)
return(0);
while (len > 0) {
xmlBufPtr buf = NULL;
int chunk;
int ret;
chunk = len;
if (chunk > 256 * 1024)
chunk = 256 * 1024;
ret = xmlBufAdd(out->buffer, (const xmlChar *) data, chunk);
if (ret != 0) {
out->error = XML_ERR_NO_MEMORY;
return(-1);
}
/*
* first handle encoding stuff.
*/
if (out->encoder != NULL) {
/*
* Store the data in the incoming raw buffer
*/
if (out->conv == NULL) {
out->conv = xmlBufCreate(MINLEN);
if (out->conv == NULL) {
out->error = XML_ERR_NO_MEMORY;
return(-1);
}
}
/*
* convert as much as possible to the parser reading buffer.
*/
if (xmlBufUse(out->buffer) < 256) {
ret = 0;
} else {
ret = xmlCharEncOutput(out, 0);
if (ret < 0)
return(-1);
}
if (out->writecallback)
buf = out->conv;
else
written += ret;
} else {
if (out->writecallback)
buf = out->buffer;
else
written += chunk;
}
data += chunk;
len -= chunk;
if ((buf != NULL) && (out->writecallback)) {
/*
* second write the stuff to the I/O channel
*/
while (1) {
size_t nbchars = xmlBufUse(buf);
if (nbchars < MINLEN)
break;
if (nbchars > 256 * 1024)
nbchars = 256 * 1024;
ret = out->writecallback(out->context,
(const char *)xmlBufContent(buf), nbchars);
if (ret < 0) {
out->error = (ret == -1) ? XML_IO_WRITE : -ret;
return(-1);
}
if ((ret == 0) || ((size_t) ret > nbchars)) {
out->error = XML_ERR_INTERNAL_ERROR;
return(-1);
}
xmlBufShrink(buf, ret);
written += ret;
if (out->written > INT_MAX - ret)
out->written = INT_MAX;
else
out->written += ret;
}
}
}
return(written <= INT_MAX ? written : INT_MAX);
}
/**
* xmlOutputBufferWriteEscape:
* @out: a buffered parser output
* @str: a zero terminated UTF-8 string
* @escaping: an optional escaping function (or NULL)
*
* Write the content of the string in the output I/O buffer
* This routine escapes the characters and then handle the I18N
* transcoding from internal UTF-8
* The buffer is lossless, i.e. will store in case of partial
* or delayed writes.
*
* Returns the number of chars immediately written, or -1
* in case of error.
*/
int
xmlOutputBufferWriteEscape(xmlOutputBufferPtr out, const xmlChar *str,
xmlCharEncodingOutputFunc escaping) {
int ret;
int written = 0;
size_t len;
if ((out == NULL) || (out->error) || (str == NULL))
return(-1);
len = strlen((const char *) str);
if (len >= INT_MAX) {
out->error = XML_ERR_RESOURCE_LIMIT;
return(-1);
}
if (escaping == NULL) {
char *escaped = (char *) xmlEscapeText(str, XML_ESCAPE_ALLOW_INVALID);
if (escaped == NULL) {
out->error = XML_ERR_NO_MEMORY;
return(-1);
}
len = strlen(escaped);
if (len >= INT_MAX) {
out->error = XML_ERR_RESOURCE_LIMIT;
return(-1);
}
ret = xmlOutputBufferWrite(out, len, escaped);
xmlFree(escaped);
return(ret);
}
while (len > 0) {
xmlChar buf[1024];
int c_out;
int c_in;
c_out = 1024;
c_in = len;
ret = escaping(buf, &c_out, str, &c_in);
if (ret < 0) {
out->error = XML_ERR_NO_MEMORY;
return(-1);
}
str += c_in;
len -= c_in;
ret = xmlOutputBufferWrite(out, c_out, (char *) buf);
if (ret < 0)
return(ret);
written += ret;
}
return(written);
}
/**
* xmlOutputBufferWriteString:
* @out: a buffered parser output
* @str: a zero terminated C string
*
* Write the content of the string in the output I/O buffer
* This routine handle the I18N transcoding from internal UTF-8
* The buffer is lossless, i.e. will store in case of partial
* or delayed writes.
*
* Returns the number of chars immediately written, or -1
* in case of error.
*/
int
xmlOutputBufferWriteString(xmlOutputBufferPtr out, const char *str) {
int len;
if ((out == NULL) || (out->error)) return(-1);
if (str == NULL)
return(-1);
len = strlen(str);
if (len > 0)
return(xmlOutputBufferWrite(out, len, str));
return(len);
}
/**
* xmlOutputBufferWriteQuotedString:
* @buf: output buffer
* @string: the string to add
*
* routine which manage and grows an output buffer. This one writes
* a quoted or double quoted #xmlChar string, checking first if it holds
* quote or double-quotes internally
*/
void
xmlOutputBufferWriteQuotedString(xmlOutputBufferPtr buf,
const xmlChar *string) {
const xmlChar *cur, *base;
if ((buf == NULL) || (buf->error))
return;
if (xmlStrchr(string, '\"')) {
if (xmlStrchr(string, '\'')) {
xmlOutputBufferWrite(buf, 1, "\"");
base = cur = string;
while(*cur != 0){
if(*cur == '"'){
if (base != cur)
xmlOutputBufferWrite(buf, cur - base,
(const char *) base);
xmlOutputBufferWrite(buf, 6, "&quot;");
cur++;
base = cur;
}
else {
cur++;
}
}
if (base != cur)
xmlOutputBufferWrite(buf, cur - base, (const char *) base);
xmlOutputBufferWrite(buf, 1, "\"");
}
else{
xmlOutputBufferWrite(buf, 1, "'");
xmlOutputBufferWriteString(buf, (const char *) string);
xmlOutputBufferWrite(buf, 1, "'");
}
} else {
xmlOutputBufferWrite(buf, 1, "\"");
xmlOutputBufferWriteString(buf, (const char *) string);
xmlOutputBufferWrite(buf, 1, "\"");
}
}
/**
* xmlOutputBufferFlush:
* @out: a buffered output
*
* flushes the output I/O channel
*
* Returns the number of byte written or -1 in case of error.
*/
int
xmlOutputBufferFlush(xmlOutputBufferPtr out) {
int nbchars = 0, ret = 0;
if ((out == NULL) || (out->error)) return(-1);
/*
* first handle encoding stuff.
*/
if ((out->conv != NULL) && (out->encoder != NULL)) {
/*
* convert as much as possible to the parser output buffer.
*/
do {
nbchars = xmlCharEncOutput(out, 0);
if (nbchars < 0)
return(-1);
} while (nbchars);
}
/*
* second flush the stuff to the I/O channel
*/
if ((out->conv != NULL) && (out->encoder != NULL) &&
(out->writecallback != NULL)) {
ret = out->writecallback(out->context,
(const char *)xmlBufContent(out->conv),
xmlBufUse(out->conv));
if (ret >= 0)
xmlBufShrink(out->conv, ret);
} else if (out->writecallback != NULL) {
ret = out->writecallback(out->context,
(const char *)xmlBufContent(out->buffer),
xmlBufUse(out->buffer));
if (ret >= 0)
xmlBufShrink(out->buffer, ret);
}
if (ret < 0) {
out->error = (ret == -1) ? XML_IO_WRITE : -ret;
return(ret);
}
if (out->written > INT_MAX - ret)
out->written = INT_MAX;
else
out->written += ret;
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlParserGetDirectory:
* @filename: the path to a file
*
* lookup the directory for that file
*
* Returns a new allocated string containing the directory, or NULL.
*/
char *
xmlParserGetDirectory(const char *filename) {
char *ret = NULL;
char dir[1024];
char *cur;
if (filename == NULL) return(NULL);
#if defined(_WIN32)
# define IS_XMLPGD_SEP(ch) ((ch=='/')||(ch=='\\'))
#else
# define IS_XMLPGD_SEP(ch) (ch=='/')
#endif
strncpy(dir, filename, 1023);
dir[1023] = 0;
cur = &dir[strlen(dir)];
while (cur > dir) {
if (IS_XMLPGD_SEP(*cur)) break;
cur --;
}
if (IS_XMLPGD_SEP(*cur)) {
if (cur == dir) dir[1] = 0;
else *cur = 0;
ret = xmlMemStrdup(dir);
} else {
if (getcwd(dir, 1024) != NULL) {
dir[1023] = 0;
ret = xmlMemStrdup(dir);
}
}
return(ret);
#undef IS_XMLPGD_SEP
}
/**
* xmlNoNetExists:
* @filename: the path to check
*
* DEPRECATED: Internal function, don't use.
*
* Like xmlCheckFilename but handles file URIs.
*
* Returns 0, 1, or 2.
*/
int
xmlNoNetExists(const char *filename) {
char *fromUri;
int ret;
if (filename == NULL)
return(0);
if (xmlConvertUriToPath(filename, &fromUri) < 0)
return(0);
if (fromUri != NULL)
filename = fromUri;
ret = xmlCheckFilename(filename);
xmlFree(fromUri);
return(ret);
}
/************************************************************************
* *
* Input/output callbacks *
* *
************************************************************************/
/**
* xmlInitIOCallbacks:
*
* Initialize callback tables.
*/
void
xmlInitIOCallbacks(void)
{
xmlInputCallbackNr = 1;
xmlInputCallbackTable[0].matchcallback = xmlIODefaultMatch;
#ifdef LIBXML_OUTPUT_ENABLED
xmlOutputCallbackNr = 1;
xmlOutputCallbackTable[0].matchcallback = xmlIODefaultMatch;
#endif
}
/**
* xmlRegisterInputCallbacks:
* @matchFunc: the xmlInputMatchCallback
* @openFunc: the xmlInputOpenCallback
* @readFunc: the xmlInputReadCallback
* @closeFunc: the xmlInputCloseCallback
*
* DEPRECATED: Use xmlCtxtSetResourceLoader or similar functions.
*
* Register a new set of I/O callback for handling parser input.
*
* Returns the registered handler number or -1 in case of error
*/
int
xmlRegisterInputCallbacks(xmlInputMatchCallback matchFunc,
xmlInputOpenCallback openFunc, xmlInputReadCallback readFunc,
xmlInputCloseCallback closeFunc) {
if (xmlInputCallbackNr >= MAX_INPUT_CALLBACK) {
return(-1);
}
xmlInputCallbackTable[xmlInputCallbackNr].matchcallback = matchFunc;
xmlInputCallbackTable[xmlInputCallbackNr].opencallback = openFunc;
xmlInputCallbackTable[xmlInputCallbackNr].readcallback = readFunc;
xmlInputCallbackTable[xmlInputCallbackNr].closecallback = closeFunc;
return(xmlInputCallbackNr++);
}
/**
* xmlRegisterDefaultInputCallbacks:
*
* Registers the default compiled-in I/O handlers.
*/
void
xmlRegisterDefaultInputCallbacks(void) {
xmlRegisterInputCallbacks(xmlIODefaultMatch, NULL, NULL, NULL);
}
/**
* xmlPopInputCallbacks:
*
* Clear the top input callback from the input stack. this includes the
* compiled-in I/O.
*
* Returns the number of input callback registered or -1 in case of error.
*/
int
xmlPopInputCallbacks(void)
{
if (xmlInputCallbackNr <= 0)
return(-1);
xmlInputCallbackNr--;
return(xmlInputCallbackNr);
}
/**
* xmlCleanupInputCallbacks:
*
* clears the entire input callback table. this includes the
* compiled-in I/O.
*/
void
xmlCleanupInputCallbacks(void)
{
xmlInputCallbackNr = 0;
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlRegisterOutputCallbacks:
* @matchFunc: the xmlOutputMatchCallback
* @openFunc: the xmlOutputOpenCallback
* @writeFunc: the xmlOutputWriteCallback
* @closeFunc: the xmlOutputCloseCallback
*
* Register a new set of I/O callback for handling output.
*
* Returns the registered handler number or -1 in case of error
*/
int
xmlRegisterOutputCallbacks(xmlOutputMatchCallback matchFunc,
xmlOutputOpenCallback openFunc, xmlOutputWriteCallback writeFunc,
xmlOutputCloseCallback closeFunc) {
if (xmlOutputCallbackNr >= MAX_OUTPUT_CALLBACK) {
return(-1);
}
xmlOutputCallbackTable[xmlOutputCallbackNr].matchcallback = matchFunc;
xmlOutputCallbackTable[xmlOutputCallbackNr].opencallback = openFunc;
xmlOutputCallbackTable[xmlOutputCallbackNr].writecallback = writeFunc;
xmlOutputCallbackTable[xmlOutputCallbackNr].closecallback = closeFunc;
return(xmlOutputCallbackNr++);
}
/**
* xmlRegisterDefaultOutputCallbacks:
*
* Registers the default compiled-in I/O handlers.
*/
void
xmlRegisterDefaultOutputCallbacks (void) {
xmlRegisterOutputCallbacks(xmlIODefaultMatch, NULL, NULL, NULL);
}
/**
* xmlPopOutputCallbacks:
*
* Remove the top output callbacks from the output stack. This includes the
* compiled-in I/O.
*
* Returns the number of output callback registered or -1 in case of error.
*/
int
xmlPopOutputCallbacks(void)
{
if (xmlOutputCallbackNr <= 0)
return(-1);
xmlOutputCallbackNr--;
return(xmlOutputCallbackNr);
}
/**
* xmlCleanupOutputCallbacks:
*
* clears the entire output callback table. this includes the
* compiled-in I/O callbacks.
*/
void
xmlCleanupOutputCallbacks(void)
{
xmlOutputCallbackNr = 0;
}
#ifdef LIBXML_HTTP_ENABLED
/**
* xmlRegisterHTTPPostCallbacks:
*
* DEPRECATED: Support for HTTP POST has been removed.
*/
void
xmlRegisterHTTPPostCallbacks(void) {
xmlRegisterDefaultOutputCallbacks();
}
#endif
#endif /* LIBXML_OUTPUT_ENABLED */
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