/* crypto/bio/bss_file.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/*
 * 03-Dec-1997	rdenny@dc3.com  Fix bug preventing use of stdin/stdout
 *		with binary data (e.g. asn1parse -inform DER < xxx) under
 *		Windows
 */

#ifndef HEADER_BSS_FILE_C
#define HEADER_BSS_FILE_C

#if defined(__linux) || defined(__sun) || defined(__hpux)
/* Following definition aliases fopen to fopen64 on above mentioned
 * platforms. This makes it possible to open and sequentially access
 * files larger than 2GB from 32-bit application. It does not allow to
 * traverse them beyond 2GB with fseek/ftell, but on the other hand *no*
 * 32-bit platform permits that, not with fseek/ftell. Not to mention
 * that breaking 2GB limit for seeking would require surgery to *our*
 * API. But sequential access suffices for practical cases when you
 * can run into large files, such as fingerprinting, so we can let API
 * alone. For reference, the list of 32-bit platforms which allow for
 * sequential access of large files without extra "magic" comprise *BSD,
 * Darwin, IRIX...
 */
#ifndef _FILE_OFFSET_BITS
#define _FILE_OFFSET_BITS 64
#endif
#endif

#include <stdio.h>
#include <errno.h>
#include "cryptlib.h"
#include "bio_lcl.h"
#include <openssl/err.h>

#if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_CLIB)
#include <nwfileio.h>
#endif

#if !defined(OPENSSL_NO_STDIO)

static int MS_CALLBACK file_write(BIO *h, const char *buf, int num);
static int MS_CALLBACK file_read(BIO *h, char *buf, int size);
static int MS_CALLBACK file_puts(BIO *h, const char *str);
static int MS_CALLBACK file_gets(BIO *h, char *str, int size);
static long MS_CALLBACK file_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int MS_CALLBACK file_new(BIO *h);
static int MS_CALLBACK file_free(BIO *data);
static BIO_METHOD methods_filep=
	{
	BIO_TYPE_FILE,
	"FILE pointer",
	file_write,
	file_read,
	file_puts,
	file_gets,
	file_ctrl,
	file_new,
	file_free,
	NULL,
	};

BIO *BIO_new_file(const char *filename, const char *mode)
	{
	BIO  *ret;
	FILE *file=NULL;

#if defined(_WIN32) && defined(CP_UTF8)
	int sz, len_0 = (int)strlen(filename)+1;
	DWORD flags;

	/*
	 * Basically there are three cases to cover: a) filename is
	 * pure ASCII string; b) actual UTF-8 encoded string and
	 * c) locale-ized string, i.e. one containing 8-bit
	 * characters that are meaningful in current system locale.
	 * If filename is pure ASCII or real UTF-8 encoded string,
	 * MultiByteToWideChar succeeds and _wfopen works. If
	 * filename is locale-ized string, chances are that
	 * MultiByteToWideChar fails reporting
	 * ERROR_NO_UNICODE_TRANSLATION, in which case we fall
	 * back to fopen...
	 */
	if ((sz=MultiByteToWideChar(CP_UTF8,(flags=MB_ERR_INVALID_CHARS),
					filename,len_0,NULL,0))>0 ||
	    (GetLastError()==ERROR_INVALID_FLAGS &&
	     (sz=MultiByteToWideChar(CP_UTF8,(flags=0),
					filename,len_0,NULL,0))>0)
	   )
		{
		WCHAR  wmode[8];
		WCHAR *wfilename = _alloca(sz*sizeof(WCHAR));

		if (MultiByteToWideChar(CP_UTF8,flags,
					filename,len_0,wfilename,sz) &&
		    MultiByteToWideChar(CP_UTF8,0,mode,strlen(mode)+1,
			    		wmode,sizeof(wmode)/sizeof(wmode[0])) &&
		    (file=_wfopen(wfilename,wmode))==NULL &&
		    (errno==ENOENT || errno==EBADF)
		   )	/* UTF-8 decode succeeded, but no file, filename
			 * could still have been locale-ized... */
			file = fopen(filename,mode);
		}
	else if (GetLastError()==ERROR_NO_UNICODE_TRANSLATION)
		{
		file = fopen(filename,mode);
		}
#else
	file=fopen(filename,mode);	
#endif
	if (file == NULL)
		{
		SYSerr(SYS_F_FOPEN,get_last_sys_error());
		ERR_add_error_data(5,"fopen('",filename,"','",mode,"')");
		if (errno == ENOENT)
			BIOerr(BIO_F_BIO_NEW_FILE,BIO_R_NO_SUCH_FILE);
		else
			BIOerr(BIO_F_BIO_NEW_FILE,ERR_R_SYS_LIB);
		return(NULL);
		}
	if ((ret=BIO_new(BIO_s_file())) == NULL)
		{
		fclose(file);
		return(NULL);
		}

	BIO_clear_flags(ret,BIO_FLAGS_UPLINK); /* we did fopen -> we disengage UPLINK */
	BIO_set_fp(ret,file,BIO_CLOSE);
	return(ret);
	}

BIO *BIO_new_fp(FILE *stream, int close_flag)
	{
	BIO *ret;

	if ((ret=BIO_new(BIO_s_file())) == NULL)
		return(NULL);

	BIO_set_flags(ret,BIO_FLAGS_UPLINK); /* redundant, left for documentation puposes */
	BIO_set_fp(ret,stream,close_flag);
	return(ret);
	}

BIO_METHOD *BIO_s_file(void)
	{
	return(&methods_filep);
	}

static int MS_CALLBACK file_new(BIO *bi)
	{
	bi->init=0;
	bi->num=0;
	bi->ptr=NULL;
	bi->flags=BIO_FLAGS_UPLINK; /* default to UPLINK */
	return(1);
	}

static int MS_CALLBACK file_free(BIO *a)
	{
	if (a == NULL) return(0);
	if (a->shutdown)
		{
		if ((a->init) && (a->ptr != NULL))
			{
			if (a->flags&BIO_FLAGS_UPLINK)
				UP_fclose (a->ptr);
			else
				fclose (a->ptr);
			a->ptr=NULL;
			a->flags=BIO_FLAGS_UPLINK;
			}
		a->init=0;
		}
	return(1);
	}
	
static int MS_CALLBACK file_read(BIO *b, char *out, int outl)
	{
	int ret=0;

	if (b->init && (out != NULL))
		{
		if (b->flags&BIO_FLAGS_UPLINK)
			ret=UP_fread(out,1,(int)outl,b->ptr);
		else
			ret=fread(out,1,(int)outl,(FILE *)b->ptr);
		if(ret == 0 && (b->flags&BIO_FLAGS_UPLINK)?UP_ferror((FILE *)b->ptr):ferror((FILE *)b->ptr))
			{
			SYSerr(SYS_F_FREAD,get_last_sys_error());
			BIOerr(BIO_F_FILE_READ,ERR_R_SYS_LIB);
			ret=-1;
			}
		}
	return(ret);
	}

static int MS_CALLBACK file_write(BIO *b, const char *in, int inl)
	{
	int ret=0;

	if (b->init && (in != NULL))
		{
		if (b->flags&BIO_FLAGS_UPLINK)
			ret=UP_fwrite(in,(int)inl,1,b->ptr);
		else
			ret=fwrite(in,(int)inl,1,(FILE *)b->ptr);
		if (ret)
			ret=inl;
		/* ret=fwrite(in,1,(int)inl,(FILE *)b->ptr); */
		/* according to Tim Hudson <tjh@cryptsoft.com>, the commented
		 * out version above can cause 'inl' write calls under
		 * some stupid stdio implementations (VMS) */
		}
	return(ret);
	}

static long MS_CALLBACK file_ctrl(BIO *b, int cmd, long num, void *ptr)
	{
	long ret=1;
	FILE *fp=(FILE *)b->ptr;
	FILE **fpp;
	char p[4];

	switch (cmd)
		{
	case BIO_C_FILE_SEEK:
	case BIO_CTRL_RESET:
		if (b->flags&BIO_FLAGS_UPLINK)
			ret=(long)UP_fseek(b->ptr,num,0);
		else
			ret=(long)fseek(fp,num,0);
		break;
	case BIO_CTRL_EOF:
		if (b->flags&BIO_FLAGS_UPLINK)
			ret=(long)UP_feof(fp);
		else
			ret=(long)feof(fp);
		break;
	case BIO_C_FILE_TELL:
	case BIO_CTRL_INFO:
		if (b->flags&BIO_FLAGS_UPLINK)
			ret=UP_ftell(b->ptr);
		else
			ret=ftell(fp);
		break;
	case BIO_C_SET_FILE_PTR:
		file_free(b);
		b->shutdown=(int)num&BIO_CLOSE;
		b->ptr=ptr;
		b->init=1;
#if BIO_FLAGS_UPLINK!=0
#if defined(__MINGW32__) && defined(__MSVCRT__) && !defined(_IOB_ENTRIES)
#define _IOB_ENTRIES 20
#endif
#if defined(_IOB_ENTRIES)
		/* Safety net to catch purely internal BIO_set_fp calls */
		if ((size_t)ptr >= (size_t)stdin &&
		    (size_t)ptr <  (size_t)(stdin+_IOB_ENTRIES))
			BIO_clear_flags(b,BIO_FLAGS_UPLINK);
#endif
#endif
#ifdef UP_fsetmod
		if (b->flags&BIO_FLAGS_UPLINK)
			UP_fsetmod(b->ptr,(char)((num&BIO_FP_TEXT)?'t':'b'));
		else
#endif
		{
#if defined(OPENSSL_SYS_WINDOWS)
		int fd = _fileno((FILE*)ptr);
		if (num & BIO_FP_TEXT)
			_setmode(fd,_O_TEXT);
		else
			_setmode(fd,_O_BINARY);
#elif defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_CLIB)
		int fd = fileno((FILE*)ptr);
		/* Under CLib there are differences in file modes */
		if (num & BIO_FP_TEXT)
			setmode(fd,O_TEXT);
		else
			setmode(fd,O_BINARY);
#elif defined(OPENSSL_SYS_MSDOS)
		int fd = fileno((FILE*)ptr);
		/* Set correct text/binary mode */
		if (num & BIO_FP_TEXT)
			_setmode(fd,_O_TEXT);
		/* Dangerous to set stdin/stdout to raw (unless redirected) */
		else
			{
			if (fd == STDIN_FILENO || fd == STDOUT_FILENO)
				{
				if (isatty(fd) <= 0)
					_setmode(fd,_O_BINARY);
				}
			else
				_setmode(fd,_O_BINARY);
			}
#elif defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_WIN32_CYGWIN)
		int fd = fileno((FILE*)ptr);
		if (num & BIO_FP_TEXT)
			setmode(fd, O_TEXT);
		else
			setmode(fd, O_BINARY);
#endif
		}
		break;
	case BIO_C_SET_FILENAME:
		file_free(b);
		b->shutdown=(int)num&BIO_CLOSE;
		if (num & BIO_FP_APPEND)
			{
			if (num & BIO_FP_READ)
				BUF_strlcpy(p,"a+",sizeof p);
			else	BUF_strlcpy(p,"a",sizeof p);
			}
		else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE))
			BUF_strlcpy(p,"r+",sizeof p);
		else if (num & BIO_FP_WRITE)
			BUF_strlcpy(p,"w",sizeof p);
		else if (num & BIO_FP_READ)
			BUF_strlcpy(p,"r",sizeof p);
		else
			{
			BIOerr(BIO_F_FILE_CTRL,BIO_R_BAD_FOPEN_MODE);
			ret=0;
			break;
			}
#if defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_WIN32_CYGWIN)
		if (!(num & BIO_FP_TEXT))
			strcat(p,"b");
		else
			strcat(p,"t");
#endif
#if defined(OPENSSL_SYS_NETWARE)
		if (!(num & BIO_FP_TEXT))
			strcat(p,"b");
		else
			strcat(p,"t");
#endif
		fp=fopen(ptr,p);
		if (fp == NULL)
			{
			SYSerr(SYS_F_FOPEN,get_last_sys_error());
			ERR_add_error_data(5,"fopen('",ptr,"','",p,"')");
			BIOerr(BIO_F_FILE_CTRL,ERR_R_SYS_LIB);
			ret=0;
			break;
			}
		b->ptr=fp;
		b->init=1;
		BIO_clear_flags(b,BIO_FLAGS_UPLINK); /* we did fopen -> we disengage UPLINK */
		break;
	case BIO_C_GET_FILE_PTR:
		/* the ptr parameter is actually a FILE ** in this case. */
		if (ptr != NULL)
			{
			fpp=(FILE **)ptr;
			*fpp=(FILE *)b->ptr;
			}
		break;
	case BIO_CTRL_GET_CLOSE:
		ret=(long)b->shutdown;
		break;
	case BIO_CTRL_SET_CLOSE:
		b->shutdown=(int)num;
		break;
	case BIO_CTRL_FLUSH:
		if (b->flags&BIO_FLAGS_UPLINK)
			UP_fflush(b->ptr);
		else
			fflush((FILE *)b->ptr);
		break;
	case BIO_CTRL_DUP:
		ret=1;
		break;

	case BIO_CTRL_WPENDING:
	case BIO_CTRL_PENDING:
	case BIO_CTRL_PUSH:
	case BIO_CTRL_POP:
	default:
		ret=0;
		break;
		}
	return(ret);
	}

static int MS_CALLBACK file_gets(BIO *bp, char *buf, int size)
	{
	int ret=0;

	buf[0]='\0';
	if (bp->flags&BIO_FLAGS_UPLINK)
		{
		if (!UP_fgets(buf,size,bp->ptr))
			goto err;
		}
	else
		{
		if (!fgets(buf,size,(FILE *)bp->ptr))
			goto err;
		}
	if (buf[0] != '\0')
		ret=strlen(buf);
	err:
	return(ret);
	}

static int MS_CALLBACK file_puts(BIO *bp, const char *str)
	{
	int n,ret;

	n=strlen(str);
	ret=file_write(bp,str,n);
	return(ret);
	}

#else

BIO_METHOD *BIO_s_file(void)
	{
	return NULL;
	}

BIO *BIO_new_file(const char *filename, const char *mode)
	{
	return NULL;
	}

BIO *BIO_new_fp(FILE *stream, int close_flag)
	{
	return NULL;
	}

#endif /* OPENSSL_NO_STDIO */

#endif /* HEADER_BSS_FILE_C */