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file-io.c
1285 lines (1042 loc) · 26.9 KB
/
file-io.c
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/*
* file-io.c: File IO internal calls
*
* Author:
* Dick Porter (dick@ximian.com)
* Gonzalo Paniagua Javier (gonzalo@ximian.com)
*
* Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
* Copyright 2004-2009 Novell, Inc (http://www.novell.com)
* Copyright 2012 Xamarin Inc (http://www.xamarin.com)
*/
#include <config.h>
#include <glib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <mono/metadata/object.h>
#include <mono/io-layer/io-layer.h>
#include <mono/metadata/file-io.h>
#include <mono/metadata/exception.h>
#include <mono/metadata/appdomain.h>
#include <mono/metadata/marshal.h>
#include <mono/utils/strenc.h>
#include <utils/mono-io-portability.h>
#undef DEBUG
/* conversion functions */
static guint32 convert_mode(MonoFileMode mono_mode)
{
guint32 mode;
switch(mono_mode) {
case FileMode_CreateNew:
mode=CREATE_NEW;
break;
case FileMode_Create:
mode=CREATE_ALWAYS;
break;
case FileMode_Open:
mode=OPEN_EXISTING;
break;
case FileMode_OpenOrCreate:
mode=OPEN_ALWAYS;
break;
case FileMode_Truncate:
mode=TRUNCATE_EXISTING;
break;
case FileMode_Append:
mode=OPEN_ALWAYS;
break;
default:
g_warning("System.IO.FileMode has unknown value 0x%x",
mono_mode);
/* Safe fallback */
mode=OPEN_EXISTING;
}
return(mode);
}
static guint32 convert_access(MonoFileAccess mono_access)
{
guint32 access;
switch(mono_access) {
case FileAccess_Read:
access=GENERIC_READ;
break;
case FileAccess_Write:
access=GENERIC_WRITE;
break;
case FileAccess_ReadWrite:
access=GENERIC_READ|GENERIC_WRITE;
break;
default:
g_warning("System.IO.FileAccess has unknown value 0x%x",
mono_access);
/* Safe fallback */
access=GENERIC_READ;
}
return(access);
}
static guint32 convert_share(MonoFileShare mono_share)
{
guint32 share = 0;
if (mono_share & FileShare_Read) {
share |= FILE_SHARE_READ;
}
if (mono_share & FileShare_Write) {
share |= FILE_SHARE_WRITE;
}
if (mono_share & FileShare_Delete) {
share |= FILE_SHARE_DELETE;
}
if (mono_share & ~(FileShare_Read|FileShare_Write|FileShare_Delete)) {
g_warning("System.IO.FileShare has unknown value 0x%x",
mono_share);
/* Safe fallback */
share=0;
}
return(share);
}
#if 0
static guint32 convert_stdhandle(guint32 fd)
{
guint32 stdhandle;
switch(fd) {
case 0:
stdhandle=STD_INPUT_HANDLE;
break;
case 1:
stdhandle=STD_OUTPUT_HANDLE;
break;
case 2:
stdhandle=STD_ERROR_HANDLE;
break;
default:
g_warning("unknown standard file descriptor %d", fd);
stdhandle=STD_INPUT_HANDLE;
}
return(stdhandle);
}
#endif
static guint32 convert_seekorigin(MonoSeekOrigin origin)
{
guint32 w32origin;
switch(origin) {
case SeekOrigin_Begin:
w32origin=FILE_BEGIN;
break;
case SeekOrigin_Current:
w32origin=FILE_CURRENT;
break;
case SeekOrigin_End:
w32origin=FILE_END;
break;
default:
g_warning("System.IO.SeekOrigin has unknown value 0x%x",
origin);
/* Safe fallback */
w32origin=FILE_CURRENT;
}
return(w32origin);
}
static gint64 convert_filetime (const FILETIME *filetime)
{
guint64 ticks = filetime->dwHighDateTime;
ticks <<= 32;
ticks += filetime->dwLowDateTime;
return (gint64)ticks;
}
static void convert_win32_file_attribute_data (const WIN32_FILE_ATTRIBUTE_DATA *data, MonoIOStat *stat)
{
stat->attributes = data->dwFileAttributes;
stat->creation_time = convert_filetime (&data->ftCreationTime);
stat->last_access_time = convert_filetime (&data->ftLastAccessTime);
stat->last_write_time = convert_filetime (&data->ftLastWriteTime);
stat->length = ((gint64)data->nFileSizeHigh << 32) | data->nFileSizeLow;
}
/* Managed file attributes have nearly but not quite the same values
* as the w32 equivalents.
*/
static guint32 convert_attrs(MonoFileAttributes attrs)
{
if(attrs & FileAttributes_Encrypted) {
attrs |= FILE_ATTRIBUTE_ENCRYPTED;
}
return(attrs);
}
/*
* On Win32, GetFileAttributes|Ex () seems to try opening the file,
* which might lead to sharing violation errors, whereas FindFirstFile
* always succeeds. These 2 wrappers resort to FindFirstFile if
* GetFileAttributes|Ex () has failed.
*/
static guint32
get_file_attributes (const gunichar2 *path)
{
guint32 res;
WIN32_FIND_DATA find_data;
HANDLE find_handle;
gint32 error;
res = GetFileAttributes (path);
if (res != -1)
return res;
error = GetLastError ();
if (error != ERROR_SHARING_VIOLATION)
return res;
find_handle = FindFirstFile (path, &find_data);
if (find_handle == INVALID_HANDLE_VALUE)
return res;
FindClose (find_handle);
return find_data.dwFileAttributes;
}
static gboolean
get_file_attributes_ex (const gunichar2 *path, WIN32_FILE_ATTRIBUTE_DATA *data)
{
gboolean res;
WIN32_FIND_DATA find_data;
HANDLE find_handle;
gint32 error;
res = GetFileAttributesEx (path, GetFileExInfoStandard, data);
if (res)
return TRUE;
error = GetLastError ();
if (error != ERROR_SHARING_VIOLATION)
return FALSE;
find_handle = FindFirstFile (path, &find_data);
if (find_handle == INVALID_HANDLE_VALUE)
return FALSE;
FindClose (find_handle);
data->dwFileAttributes = find_data.dwFileAttributes;
data->ftCreationTime = find_data.ftCreationTime;
data->ftLastAccessTime = find_data.ftLastAccessTime;
data->ftLastWriteTime = find_data.ftLastWriteTime;
data->nFileSizeHigh = find_data.nFileSizeHigh;
data->nFileSizeLow = find_data.nFileSizeLow;
return TRUE;
}
/* System.IO.MonoIO internal calls */
MonoBoolean
ves_icall_System_IO_MonoIO_CreateDirectory (MonoString *path, gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=CreateDirectory (mono_string_chars (path), NULL);
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
MonoBoolean
ves_icall_System_IO_MonoIO_RemoveDirectory (MonoString *path, gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=RemoveDirectory (mono_string_chars (path));
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
static gchar *
get_search_dir (MonoString *pattern)
{
gchar *p;
gchar *result;
p = mono_string_to_utf8 (pattern);
result = g_path_get_dirname (p);
g_free (p);
return result;
}
static GPtrArray *
get_filesystem_entries (MonoString *path,
MonoString *path_with_pattern,
gint attrs, gint mask,
gint32 *error)
{
int i;
WIN32_FIND_DATA data;
HANDLE find_handle;
GPtrArray *names = NULL;
gchar *utf8_path = NULL, *utf8_result, *full_name;
gint32 attributes;
mask = convert_attrs (mask);
attributes = get_file_attributes (mono_string_chars (path));
if (attributes != -1) {
if ((attributes & FILE_ATTRIBUTE_DIRECTORY) == 0) {
*error = ERROR_INVALID_NAME;
goto fail;
}
} else {
*error = GetLastError ();
goto fail;
}
find_handle = FindFirstFile (mono_string_chars (path_with_pattern), &data);
if (find_handle == INVALID_HANDLE_VALUE) {
gint32 find_error = GetLastError ();
if (find_error == ERROR_FILE_NOT_FOUND || find_error == ERROR_NO_MORE_FILES) {
/* No files, so just return an empty array */
goto fail;
}
*error = find_error;
goto fail;
}
utf8_path = get_search_dir (path_with_pattern);
names = g_ptr_array_new ();
do {
if ((data.cFileName[0] == '.' && data.cFileName[1] == 0) ||
(data.cFileName[0] == '.' && data.cFileName[1] == '.' && data.cFileName[2] == 0)) {
continue;
}
if ((data.dwFileAttributes & mask) == attrs) {
utf8_result = g_utf16_to_utf8 (data.cFileName, -1, NULL, NULL, NULL);
if (utf8_result == NULL) {
continue;
}
full_name = g_build_filename (utf8_path, utf8_result, NULL);
g_ptr_array_add (names, full_name);
g_free (utf8_result);
}
} while(FindNextFile (find_handle, &data));
if (FindClose (find_handle) == FALSE) {
*error = GetLastError ();
goto fail;
}
g_free (utf8_path);
return names;
fail:
if (names) {
for (i = 0; i < names->len; i++)
g_free (g_ptr_array_index (names, i));
g_ptr_array_free (names, TRUE);
}
g_free (utf8_path);
return FALSE;
}
MonoArray *
ves_icall_System_IO_MonoIO_GetFileSystemEntries (MonoString *path,
MonoString *path_with_pattern,
gint attrs, gint mask,
gint32 *error)
{
MonoDomain *domain = mono_domain_get ();
MonoArray *result;
int i;
GPtrArray *names;
*error = ERROR_SUCCESS;
MONO_PREPARE_BLOCKING
names = get_filesystem_entries (path, path_with_pattern, attrs, mask, error);
MONO_FINISH_BLOCKING
if (!names) {
// If there's no array and no error, then return an empty array.
if (*error == ERROR_SUCCESS)
return mono_array_new (domain, mono_defaults.string_class, 0);
return NULL;
}
result = mono_array_new (domain, mono_defaults.string_class, names->len);
for (i = 0; i < names->len; i++) {
mono_array_setref (result, i, mono_string_new (domain, g_ptr_array_index (names, i)));
g_free (g_ptr_array_index (names, i));
}
g_ptr_array_free (names, TRUE);
return result;
}
typedef struct {
MonoDomain *domain;
gchar *utf8_path;
HANDLE find_handle;
} IncrementalFind;
static gboolean
incremental_find_check_match (IncrementalFind *handle, WIN32_FIND_DATA *data, MonoString **result)
{
gchar *utf8_result;
gchar *full_name;
if ((data->cFileName[0] == '.' && data->cFileName[1] == 0) || (data->cFileName[0] == '.' && data->cFileName[1] == '.' && data->cFileName[2] == 0))
return FALSE;
utf8_result = g_utf16_to_utf8 (data->cFileName, -1, NULL, NULL, NULL);
if (utf8_result == NULL)
return FALSE;
full_name = g_build_filename (handle->utf8_path, utf8_result, NULL);
g_free (utf8_result);
*result = mono_string_new (mono_domain_get (), full_name);
g_free (full_name);
return TRUE;
}
/* FIXME make gc suspendable */
MonoString *
ves_icall_System_IO_MonoIO_FindFirst (MonoString *path,
MonoString *path_with_pattern,
gint32 *result_attr, gint32 *error,
gpointer *handle)
{
WIN32_FIND_DATA data;
HANDLE find_handle;
IncrementalFind *ifh;
MonoString *result;
*error = ERROR_SUCCESS;
find_handle = FindFirstFile (mono_string_chars (path_with_pattern), &data);
if (find_handle == INVALID_HANDLE_VALUE) {
gint32 find_error = GetLastError ();
*handle = NULL;
if (find_error == ERROR_FILE_NOT_FOUND)
return NULL;
*error = find_error;
return NULL;
}
ifh = g_new (IncrementalFind, 1);
ifh->find_handle = find_handle;
ifh->utf8_path = mono_string_to_utf8 (path);
ifh->domain = mono_domain_get ();
*handle = ifh;
while (incremental_find_check_match (ifh, &data, &result) == 0){
if (FindNextFile (find_handle, &data) == FALSE){
int e = GetLastError ();
if (e != ERROR_NO_MORE_FILES)
*error = e;
return NULL;
}
}
*result_attr = data.dwFileAttributes;
return result;
}
/* FIXME make gc suspendable */
MonoString *
ves_icall_System_IO_MonoIO_FindNext (gpointer handle, gint32 *result_attr, gint32 *error)
{
IncrementalFind *ifh = handle;
WIN32_FIND_DATA data;
MonoString *result;
*error = ERROR_SUCCESS;
do {
if (FindNextFile (ifh->find_handle, &data) == FALSE){
int e = GetLastError ();
if (e != ERROR_NO_MORE_FILES)
*error = e;
return NULL;
}
} while (incremental_find_check_match (ifh, &data, &result) == 0);
*result_attr = data.dwFileAttributes;
return result;
}
int
ves_icall_System_IO_MonoIO_FindClose (gpointer handle)
{
IncrementalFind *ifh = handle;
gint32 error;
MONO_PREPARE_BLOCKING
if (FindClose (ifh->find_handle) == FALSE){
error = GetLastError ();
} else
error = ERROR_SUCCESS;
g_free (ifh->utf8_path);
g_free (ifh);
MONO_FINISH_BLOCKING
return error;
}
MonoString *
ves_icall_System_IO_MonoIO_GetCurrentDirectory (gint32 *error)
{
MonoString *result;
gunichar2 *buf;
int len, res_len;
len = MAX_PATH + 1; /*FIXME this is too smal under most unix systems.*/
buf = g_new (gunichar2, len);
*error=ERROR_SUCCESS;
result = NULL;
res_len = GetCurrentDirectory (len, buf);
if (res_len > len) { /*buf is too small.*/
int old_res_len = res_len;
g_free (buf);
buf = g_new (gunichar2, res_len);
res_len = GetCurrentDirectory (res_len, buf) == old_res_len;
}
if (res_len) {
len = 0;
while (buf [len])
++ len;
result = mono_string_new_utf16 (mono_domain_get (), buf, len);
} else {
*error=GetLastError ();
}
g_free (buf);
return result;
}
MonoBoolean
ves_icall_System_IO_MonoIO_SetCurrentDirectory (MonoString *path,
gint32 *error)
{
gboolean ret;
*error=ERROR_SUCCESS;
ret=SetCurrentDirectory (mono_string_chars (path));
if(ret==FALSE) {
*error=GetLastError ();
}
return(ret);
}
MonoBoolean
ves_icall_System_IO_MonoIO_MoveFile (MonoString *path, MonoString *dest,
gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=MoveFile (mono_string_chars (path), mono_string_chars (dest));
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
MonoBoolean
ves_icall_System_IO_MonoIO_ReplaceFile (MonoString *sourceFileName, MonoString *destinationFileName,
MonoString *destinationBackupFileName, MonoBoolean ignoreMetadataErrors,
gint32 *error)
{
gboolean ret;
gunichar2 *utf16_sourceFileName = NULL, *utf16_destinationFileName = NULL, *utf16_destinationBackupFileName = NULL;
guint32 replaceFlags = REPLACEFILE_WRITE_THROUGH;
MONO_PREPARE_BLOCKING
if (sourceFileName)
utf16_sourceFileName = mono_string_chars (sourceFileName);
if (destinationFileName)
utf16_destinationFileName = mono_string_chars (destinationFileName);
if (destinationBackupFileName)
utf16_destinationBackupFileName = mono_string_chars (destinationBackupFileName);
*error = ERROR_SUCCESS;
if (ignoreMetadataErrors)
replaceFlags |= REPLACEFILE_IGNORE_MERGE_ERRORS;
/* FIXME: source and destination file names must not be NULL, but apparently they might be! */
ret = ReplaceFile (utf16_destinationFileName, utf16_sourceFileName, utf16_destinationBackupFileName,
replaceFlags, NULL, NULL);
if (ret == FALSE)
*error = GetLastError ();
MONO_FINISH_BLOCKING
return ret;
}
MonoBoolean
ves_icall_System_IO_MonoIO_CopyFile (MonoString *path, MonoString *dest,
MonoBoolean overwrite, gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=CopyFile (mono_string_chars (path), mono_string_chars (dest), !overwrite);
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
MonoBoolean
ves_icall_System_IO_MonoIO_DeleteFile (MonoString *path, gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=DeleteFile (mono_string_chars (path));
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
gint32
ves_icall_System_IO_MonoIO_GetFileAttributes (MonoString *path, gint32 *error)
{
gint32 ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=get_file_attributes (mono_string_chars (path));
/*
* The definition of INVALID_FILE_ATTRIBUTES in the cygwin win32
* headers is wrong, hence this temporary workaround.
* See
* http://cygwin.com/ml/cygwin/2003-09/msg01771.html
*/
if (ret==-1) {
/* if(ret==INVALID_FILE_ATTRIBUTES) { */
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
MonoBoolean
ves_icall_System_IO_MonoIO_SetFileAttributes (MonoString *path, gint32 attrs,
gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=SetFileAttributes (mono_string_chars (path),
convert_attrs (attrs));
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
gint32
ves_icall_System_IO_MonoIO_GetFileType (HANDLE handle, gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=GetFileType (handle);
if(ret==FILE_TYPE_UNKNOWN) {
/* Not necessarily an error, but the caller will have
* to decide based on the error value.
*/
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
MonoBoolean
ves_icall_System_IO_MonoIO_GetFileStat (MonoString *path, MonoIOStat *stat,
gint32 *error)
{
gboolean result;
WIN32_FILE_ATTRIBUTE_DATA data;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
result = get_file_attributes_ex (mono_string_chars (path), &data);
if (result) {
convert_win32_file_attribute_data (&data, stat);
} else {
*error=GetLastError ();
memset (stat, 0, sizeof (MonoIOStat));
}
MONO_FINISH_BLOCKING
return result;
}
HANDLE
ves_icall_System_IO_MonoIO_Open (MonoString *filename, gint32 mode,
gint32 access_mode, gint32 share, gint32 options,
gint32 *error)
{
HANDLE ret;
int attributes, attrs;
gunichar2 *chars;
MONO_PREPARE_BLOCKING
chars = mono_string_chars (filename);
*error=ERROR_SUCCESS;
if (options != 0){
if (options & FileOptions_Encrypted)
attributes = FILE_ATTRIBUTE_ENCRYPTED;
else
attributes = FILE_ATTRIBUTE_NORMAL;
if (options & FileOptions_DeleteOnClose)
attributes |= FILE_FLAG_DELETE_ON_CLOSE;
if (options & FileOptions_SequentialScan)
attributes |= FILE_FLAG_SEQUENTIAL_SCAN;
if (options & FileOptions_RandomAccess)
attributes |= FILE_FLAG_RANDOM_ACCESS;
if (options & FileOptions_Temporary)
attributes |= FILE_ATTRIBUTE_TEMPORARY;
/* Not sure if we should set FILE_FLAG_OVERLAPPED, how does this mix with the "Async" bool here? */
if (options & FileOptions_Asynchronous)
attributes |= FILE_FLAG_OVERLAPPED;
if (options & FileOptions_WriteThrough)
attributes |= FILE_FLAG_WRITE_THROUGH;
} else
attributes = FILE_ATTRIBUTE_NORMAL;
/* If we're opening a directory we need to set the extra flag
*/
attrs = get_file_attributes (chars);
if (attrs != INVALID_FILE_ATTRIBUTES) {
if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
attributes |= FILE_FLAG_BACKUP_SEMANTICS;
}
}
ret=CreateFile (chars, convert_access (access_mode),
convert_share (share), NULL, convert_mode (mode),
attributes, NULL);
if(ret==INVALID_HANDLE_VALUE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
MonoBoolean
ves_icall_System_IO_MonoIO_Close (HANDLE handle, gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=CloseHandle (handle);
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
gint32
ves_icall_System_IO_MonoIO_Read (HANDLE handle, MonoArray *dest,
gint32 dest_offset, gint32 count,
gint32 *error)
{
guchar *buffer;
gboolean result;
guint32 n;
*error=ERROR_SUCCESS;
MONO_CHECK_ARG_NULL (dest, 0);
if (dest_offset > mono_array_length (dest) - count) {
mono_set_pending_exception (mono_get_exception_argument ("array", "array too small. numBytes/offset wrong."));
return 0;
}
buffer = mono_array_addr (dest, guchar, dest_offset);
MONO_PREPARE_BLOCKING
result = ReadFile (handle, buffer, count, &n, NULL);
MONO_FINISH_BLOCKING
if (!result) {
*error=GetLastError ();
return -1;
}
return (gint32)n;
}
gint32
ves_icall_System_IO_MonoIO_Write (HANDLE handle, MonoArray *src,
gint32 src_offset, gint32 count,
gint32 *error)
{
guchar *buffer;
gboolean result;
guint32 n;
*error=ERROR_SUCCESS;
MONO_CHECK_ARG_NULL (src, 0);
if (src_offset > mono_array_length (src) - count) {
mono_set_pending_exception (mono_get_exception_argument ("array", "array too small. numBytes/offset wrong."));
return 0;
}
buffer = mono_array_addr (src, guchar, src_offset);
MONO_PREPARE_BLOCKING
result = WriteFile (handle, buffer, count, &n, NULL);
MONO_FINISH_BLOCKING
if (!result) {
*error=GetLastError ();
return -1;
}
return (gint32)n;
}
gint64
ves_icall_System_IO_MonoIO_Seek (HANDLE handle, gint64 offset, gint32 origin,
gint32 *error)
{
gint32 offset_hi;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
offset_hi = offset >> 32;
offset = SetFilePointer (handle, (gint32) (offset & 0xFFFFFFFF), &offset_hi,
convert_seekorigin (origin));
if(offset==INVALID_SET_FILE_POINTER) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return offset | ((gint64)offset_hi << 32);
}
MonoBoolean
ves_icall_System_IO_MonoIO_Flush (HANDLE handle, gint32 *error)
{
gboolean ret;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
ret=FlushFileBuffers (handle);
if(ret==FALSE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return(ret);
}
gint64
ves_icall_System_IO_MonoIO_GetLength (HANDLE handle, gint32 *error)
{
gint64 length;
guint32 length_hi;
MONO_PREPARE_BLOCKING
*error=ERROR_SUCCESS;
length = GetFileSize (handle, &length_hi);
if(length==INVALID_FILE_SIZE) {
*error=GetLastError ();
}
MONO_FINISH_BLOCKING
return length | ((gint64)length_hi << 32);
}
/* FIXME make gc suspendable */
MonoBoolean
ves_icall_System_IO_MonoIO_SetLength (HANDLE handle, gint64 length,
gint32 *error)
{
gint64 offset, offset_set;
gint32 offset_hi;
gint32 length_hi;
gboolean result;
*error=ERROR_SUCCESS;
/* save file pointer */
offset_hi = 0;
offset = SetFilePointer (handle, 0, &offset_hi, FILE_CURRENT);
if(offset==INVALID_SET_FILE_POINTER) {
*error=GetLastError ();
return(FALSE);
}
/* extend or truncate */
length_hi = length >> 32;
offset_set=SetFilePointer (handle, length & 0xFFFFFFFF, &length_hi,
FILE_BEGIN);
if(offset_set==INVALID_SET_FILE_POINTER) {
*error=GetLastError ();
return(FALSE);
}
result = SetEndOfFile (handle);
if(result==FALSE) {
*error=GetLastError ();
return(FALSE);
}
/* restore file pointer */
offset_set=SetFilePointer (handle, offset & 0xFFFFFFFF, &offset_hi,
FILE_BEGIN);
if(offset_set==INVALID_SET_FILE_POINTER) {
*error=GetLastError ();
return(FALSE);
}
return result;
}