mirror of
git://git.gnupg.org/gnupg.git
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5bc5baf304
filenames for the fd_cache. This is needed because the backslash is an alias for a slash under W32. Reported by Tobias Winkler.
2212 lines
54 KiB
C
2212 lines
54 KiB
C
/* iobuf.c - file handling
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* Copyright (C) 1998, 1999, 2000, 2001, 2003,
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* 2004 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef HAVE_DOSISH_SYSTEM
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#include <windows.h>
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#endif
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#ifdef __riscos__
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#include <kernel.h>
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#include <swis.h>
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#endif /* __riscos__ */
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#include "memory.h"
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#include "util.h"
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#include "iobuf.h"
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#undef FILE_FILTER_USES_STDIO
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#ifdef HAVE_DOSISH_SYSTEM
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#define USE_SETMODE 1
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#endif
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#ifdef FILE_FILTER_USES_STDIO
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#define my_fileno(a) fileno ((a))
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#define my_fopen_ro(a,b) fopen ((a),(b))
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#define my_fopen(a,b) fopen ((a),(b))
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typedef FILE *FILEP_OR_FD;
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#define INVALID_FP NULL
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#define FILEP_OR_FD_FOR_STDIN (stdin)
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#define FILEP_OR_FD_FOR_STDOUT (stdout)
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typedef struct {
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FILE *fp; /* open file handle */
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int keep_open;
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int no_cache;
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int print_only_name; /* flags indicating that fname is not a real file*/
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char fname[1]; /* name of the file */
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} file_filter_ctx_t ;
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#else
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#define my_fileno(a) (a)
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#define my_fopen_ro(a,b) fd_cache_open ((a),(b))
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#define my_fopen(a,b) direct_open ((a),(b))
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#ifdef HAVE_DOSISH_SYSTEM
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typedef HANDLE FILEP_OR_FD;
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#define INVALID_FP ((HANDLE)-1)
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#define FILEP_OR_FD_FOR_STDIN (GetStdHandle (STD_INPUT_HANDLE))
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#define FILEP_OR_FD_FOR_STDOUT (GetStdHandle (STD_OUTPUT_HANDLE))
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#undef USE_SETMODE
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#else
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typedef int FILEP_OR_FD;
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#define INVALID_FP (-1)
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#define FILEP_OR_FD_FOR_STDIN (0)
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#define FILEP_OR_FD_FOR_STDOUT (1)
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#endif
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typedef struct {
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FILEP_OR_FD fp; /* open file handle */
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int keep_open;
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int no_cache;
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int eof_seen;
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int print_only_name; /* flags indicating that fname is not a real file*/
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char fname[1]; /* name of the file */
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} file_filter_ctx_t ;
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struct close_cache_s {
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struct close_cache_s *next;
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FILEP_OR_FD fp;
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char fname[1];
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};
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typedef struct close_cache_s *CLOSE_CACHE;
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static CLOSE_CACHE close_cache;
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#endif
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#ifdef _WIN32
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typedef struct {
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int sock;
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int keep_open;
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int no_cache;
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int eof_seen;
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int print_only_name; /* flags indicating that fname is not a real file*/
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char fname[1]; /* name of the file */
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} sock_filter_ctx_t ;
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#endif /*_WIN32*/
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/* The first partial length header block must be of size 512
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* to make it easier (and efficienter) we use a min. block size of 512
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* for all chunks (but the last one) */
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#define OP_MIN_PARTIAL_CHUNK 512
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#define OP_MIN_PARTIAL_CHUNK_2POW 9
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typedef struct {
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int use;
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size_t size;
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size_t count;
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int partial; /* 1 = partial header, 2 in last partial packet */
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char *buffer; /* used for partial header */
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size_t buflen; /* used size of buffer */
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int first_c; /* of partial header (which is > 0)*/
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int eof;
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} block_filter_ctx_t;
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static int special_names_enabled;
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static int underflow(IOBUF a);
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static int translate_file_handle ( int fd, int for_write );
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#ifndef FILE_FILTER_USES_STDIO
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/* This is a replacement for strcmp. Under W32 it does not
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distinguish between backslash and slash. */
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static int
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fd_cache_strcmp (const char *a, const char *b)
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{
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#ifdef HAVE_DOSISH_SYSTEM
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for (; *a && *b; a++, b++)
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{
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if (*a != *b && !((*a == '/' && *b == '\\')
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|| (*a == '\\' && *b == '/')) )
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break;
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}
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return *(const unsigned *)a - *(const unsigned *)b;
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#else
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return strcmp (a, b);
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#endif
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}
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/*
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* Invalidate (i.e. close) a cached iobuf
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*/
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static void
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fd_cache_invalidate (const char *fname)
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{
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CLOSE_CACHE cc;
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assert (fname);
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if( DBG_IOBUF )
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log_debug ("fd_cache_invalidate (%s)\n", fname);
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for (cc=close_cache; cc; cc = cc->next ) {
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if ( cc->fp != INVALID_FP && !fd_cache_strcmp (cc->fname, fname) ) {
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if( DBG_IOBUF )
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log_debug (" did (%s)\n", cc->fname);
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#ifdef HAVE_DOSISH_SYSTEM
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CloseHandle (cc->fp);
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#else
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close(cc->fp);
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#endif
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cc->fp = INVALID_FP;
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}
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}
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}
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static FILEP_OR_FD
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direct_open (const char *fname, const char *mode)
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{
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#ifdef HAVE_DOSISH_SYSTEM
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unsigned long da, cd, sm;
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HANDLE hfile;
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/* Note, that we do not handle all mode combinations */
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/* According to the ReactOS source it seems that open() of the
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* standard MSW32 crt does open the file in share mode which is
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* something new for MS applications ;-)
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*/
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if ( strchr (mode, '+') ) {
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fd_cache_invalidate (fname);
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da = GENERIC_READ|GENERIC_WRITE;
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cd = OPEN_EXISTING;
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sm = FILE_SHARE_READ | FILE_SHARE_WRITE;
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}
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else if ( strchr (mode, 'w') ) {
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fd_cache_invalidate (fname);
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da = GENERIC_WRITE;
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cd = CREATE_ALWAYS;
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sm = FILE_SHARE_WRITE;
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}
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else {
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da = GENERIC_READ;
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cd = OPEN_EXISTING;
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sm = FILE_SHARE_READ;
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}
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hfile = CreateFile (fname, da, sm, NULL, cd, FILE_ATTRIBUTE_NORMAL, NULL);
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return hfile;
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#else
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int oflag;
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int cflag = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
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/* Note, that we do not handle all mode combinations */
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if ( strchr (mode, '+') ) {
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fd_cache_invalidate (fname);
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oflag = O_RDWR;
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}
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else if ( strchr (mode, 'w') ) {
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fd_cache_invalidate (fname);
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oflag = O_WRONLY | O_CREAT | O_TRUNC;
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}
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else {
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oflag = O_RDONLY;
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}
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#ifdef O_BINARY
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if (strchr (mode, 'b'))
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oflag |= O_BINARY;
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#endif
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#ifndef __riscos__
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return open (fname, oflag, cflag );
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#else
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{
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struct stat buf;
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int rc = stat( fname, &buf );
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/* Don't allow iobufs on directories */
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if( !rc && S_ISDIR(buf.st_mode) && !S_ISREG(buf.st_mode) )
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return __set_errno( EISDIR );
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else
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return open( fname, oflag, cflag );
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}
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#endif
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#endif
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}
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/*
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* Instead of closing an FD we keep it open and cache it for later reuse
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* Note that this caching strategy only works if the process does not chdir.
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*/
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static void
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fd_cache_close (const char *fname, FILEP_OR_FD fp)
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{
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CLOSE_CACHE cc;
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assert (fp);
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if ( !fname || !*fname ) {
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#ifdef HAVE_DOSISH_SYSTEM
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CloseHandle (fp);
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#else
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close(fp);
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#endif
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if( DBG_IOBUF )
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log_debug ("fd_cache_close (%p) real\n", (void*)fp);
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return;
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}
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/* try to reuse a slot */
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for (cc=close_cache; cc; cc = cc->next ) {
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if ( cc->fp == INVALID_FP && !fd_cache_strcmp (cc->fname, fname) ) {
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cc->fp = fp;
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if( DBG_IOBUF )
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log_debug ("fd_cache_close (%s) used existing slot\n", fname);
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return;
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}
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}
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/* add a new one */
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if( DBG_IOBUF )
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log_debug ("fd_cache_close (%s) new slot created\n", fname);
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cc = m_alloc_clear (sizeof *cc + strlen (fname));
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strcpy (cc->fname, fname);
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cc->fp = fp;
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cc->next = close_cache;
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close_cache = cc;
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}
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/*
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* Do an direct_open on FNAME but first try to reuse one from the fd_cache
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*/
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static FILEP_OR_FD
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fd_cache_open (const char *fname, const char *mode)
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{
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CLOSE_CACHE cc;
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assert (fname);
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for (cc=close_cache; cc; cc = cc->next ) {
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if ( cc->fp != INVALID_FP && !fd_cache_strcmp (cc->fname, fname) ) {
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FILEP_OR_FD fp = cc->fp;
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cc->fp = INVALID_FP;
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if( DBG_IOBUF )
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log_debug ("fd_cache_open (%s) using cached fp\n", fname);
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#ifdef HAVE_DOSISH_SYSTEM
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if (SetFilePointer (fp, 0, NULL, FILE_BEGIN) == 0xffffffff ) {
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log_error ("rewind file failed on handle %p: %s\n",
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fp, w32_strerror (errno));
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fp = INVALID_FP;
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}
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#else
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if ( lseek (fp, 0, SEEK_SET) == (off_t)-1 ) {
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log_error("can't rewind fd %d: %s\n", fp, strerror(errno) );
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fp = INVALID_FP;
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}
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#endif
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return fp;
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}
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}
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if( DBG_IOBUF )
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log_debug ("fd_cache_open (%s) not cached\n", fname);
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return direct_open (fname, mode);
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}
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#endif /*FILE_FILTER_USES_STDIO*/
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/****************
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* Read data from a file into buf which has an allocated length of *LEN.
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* return the number of read bytes in *LEN. OPAQUE is the FILE * of
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* the stream. A is not used.
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* control may be:
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* IOBUFCTRL_INIT: called just before the function is linked into the
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* list of function. This can be used to prepare internal
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* data structures of the function.
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* IOBUFCTRL_FREE: called just before the function is removed from the
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* list of functions and can be used to release internal
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* data structures or close a file etc.
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* IOBUFCTRL_UNDERFLOW: called by iobuf_underflow to fill the buffer
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* with new stuff. *RET_LEN is the available size of the
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* buffer, and should be set to the number of bytes
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* which were put into the buffer. The function
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* returns 0 to indicate success, -1 on EOF and
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* G10ERR_xxxxx for other errors.
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*
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* IOBUFCTRL_FLUSH: called by iobuf_flush() to write out the collected stuff.
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* *RET_LAN is the number of bytes in BUF.
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*
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* IOBUFCTRL_CANCEL: send to all filters on behalf of iobuf_cancel. The
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* filter may take appropriate action on this message.
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*/
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static int
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file_filter(void *opaque, int control, IOBUF chain, byte *buf, size_t *ret_len)
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{
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file_filter_ctx_t *a = opaque;
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FILEP_OR_FD f = a->fp;
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size_t size = *ret_len;
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size_t nbytes = 0;
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int rc = 0;
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#ifdef FILE_FILTER_USES_STDIO
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if( control == IOBUFCTRL_UNDERFLOW ) {
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assert( size ); /* need a buffer */
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if ( feof(f)) { /* On terminals you could easiely read as many EOFs as you call */
|
||
rc = -1; /* fread() or fgetc() repeatly. Every call will block until you press */
|
||
*ret_len = 0; /* CTRL-D. So we catch this case before we call fread() again. */
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}
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else {
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clearerr( f );
|
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nbytes = fread( buf, 1, size, f );
|
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if( feof(f) && !nbytes ) {
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rc = -1; /* okay: we can return EOF now. */
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}
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else if( ferror(f) && errno != EPIPE ) {
|
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log_error("%s: read error: %s\n",
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a->fname, strerror(errno));
|
||
rc = G10ERR_READ_FILE;
|
||
}
|
||
*ret_len = nbytes;
|
||
}
|
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}
|
||
else if( control == IOBUFCTRL_FLUSH ) {
|
||
if( size ) {
|
||
clearerr( f );
|
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nbytes = fwrite( buf, 1, size, f );
|
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if( ferror(f) ) {
|
||
log_error("%s: write error: %s\n", a->fname, strerror(errno));
|
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rc = G10ERR_WRITE_FILE;
|
||
}
|
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}
|
||
*ret_len = nbytes;
|
||
}
|
||
else if( control == IOBUFCTRL_INIT ) {
|
||
a->keep_open = a->no_cache = 0;
|
||
}
|
||
else if( control == IOBUFCTRL_DESC ) {
|
||
*(char**)buf = "file_filter";
|
||
}
|
||
else if( control == IOBUFCTRL_FREE ) {
|
||
if( f != stdin && f != stdout ) {
|
||
if( DBG_IOBUF )
|
||
log_debug("%s: close fd %d\n", a->fname, fileno(f) );
|
||
if (!a->keep_open)
|
||
fclose(f);
|
||
}
|
||
f = NULL;
|
||
m_free(a); /* we can free our context now */
|
||
}
|
||
#else /* !stdio implementation */
|
||
|
||
if( control == IOBUFCTRL_UNDERFLOW ) {
|
||
assert( size ); /* need a buffer */
|
||
if ( a->eof_seen) {
|
||
rc = -1;
|
||
*ret_len = 0;
|
||
}
|
||
else {
|
||
#ifdef HAVE_DOSISH_SYSTEM
|
||
unsigned long nread;
|
||
|
||
nbytes = 0;
|
||
if ( !ReadFile ( f, buf, size, &nread, NULL ) ) {
|
||
if ((int)GetLastError () != ERROR_BROKEN_PIPE) {
|
||
log_error ("%s: read error: %s\n", a->fname,
|
||
w32_strerror (0));
|
||
rc = G10ERR_READ_FILE;
|
||
}
|
||
}
|
||
else if ( !nread ) {
|
||
a->eof_seen = 1;
|
||
rc = -1;
|
||
}
|
||
else {
|
||
nbytes = nread;
|
||
}
|
||
|
||
#else
|
||
|
||
int n;
|
||
|
||
nbytes = 0;
|
||
do {
|
||
n = read ( f, buf, size );
|
||
} while (n == -1 && errno == EINTR );
|
||
if ( n == -1 ) { /* error */
|
||
if (errno != EPIPE) {
|
||
log_error("%s: read error: %s\n",
|
||
a->fname, strerror(errno));
|
||
rc = G10ERR_READ_FILE;
|
||
}
|
||
}
|
||
else if ( !n ) { /* eof */
|
||
a->eof_seen = 1;
|
||
rc = -1;
|
||
}
|
||
else {
|
||
nbytes = n;
|
||
}
|
||
#endif
|
||
*ret_len = nbytes;
|
||
}
|
||
}
|
||
else if( control == IOBUFCTRL_FLUSH ) {
|
||
if( size ) {
|
||
#ifdef HAVE_DOSISH_SYSTEM
|
||
byte *p = buf;
|
||
unsigned long n;
|
||
|
||
nbytes = size;
|
||
do {
|
||
if (size && !WriteFile (f, p, nbytes, &n, NULL)) {
|
||
log_error ("%s: write error: %s\n", a->fname,
|
||
w32_strerror (0));
|
||
rc = G10ERR_WRITE_FILE;
|
||
break;
|
||
}
|
||
p += n;
|
||
nbytes -= n;
|
||
} while ( nbytes );
|
||
nbytes = p - buf;
|
||
#else
|
||
byte *p = buf;
|
||
int n;
|
||
|
||
nbytes = size;
|
||
do {
|
||
do {
|
||
n = write ( f, p, nbytes );
|
||
} while ( n == -1 && errno == EINTR );
|
||
if ( n > 0 ) {
|
||
p += n;
|
||
nbytes -= n;
|
||
}
|
||
} while ( n != -1 && nbytes );
|
||
if( n == -1 ) {
|
||
log_error("%s: write error: %s\n", a->fname, strerror(errno));
|
||
rc = G10ERR_WRITE_FILE;
|
||
}
|
||
nbytes = p - buf;
|
||
#endif
|
||
}
|
||
*ret_len = nbytes;
|
||
}
|
||
else if ( control == IOBUFCTRL_INIT ) {
|
||
a->eof_seen = 0;
|
||
a->keep_open = 0;
|
||
a->no_cache = 0;
|
||
}
|
||
else if ( control == IOBUFCTRL_DESC ) {
|
||
*(char**)buf = "file_filter(fd)";
|
||
}
|
||
else if ( control == IOBUFCTRL_FREE ) {
|
||
#ifdef HAVE_DOSISH_SYSTEM
|
||
if ( f != FILEP_OR_FD_FOR_STDIN && f != FILEP_OR_FD_FOR_STDOUT ) {
|
||
if( DBG_IOBUF )
|
||
log_debug("%s: close handle %p\n", a->fname, f );
|
||
if (!a->keep_open)
|
||
fd_cache_close (a->no_cache?NULL:a->fname, f);
|
||
}
|
||
#else
|
||
if ( (int)f != 0 && (int)f != 1 ) {
|
||
if( DBG_IOBUF )
|
||
log_debug("%s: close fd %d\n", a->fname, f );
|
||
if (!a->keep_open)
|
||
fd_cache_close (a->no_cache?NULL:a->fname, f);
|
||
}
|
||
f = INVALID_FP;
|
||
#endif
|
||
m_free (a); /* we can free our context now */
|
||
}
|
||
#endif /* !stdio implementation */
|
||
return rc;
|
||
}
|
||
|
||
#ifdef _WIN32
|
||
/* Becuase sockets are an special object under Lose32 we have to
|
||
* use a special filter */
|
||
static int
|
||
sock_filter (void *opaque, int control, IOBUF chain, byte *buf, size_t *ret_len)
|
||
{
|
||
sock_filter_ctx_t *a = opaque;
|
||
size_t size = *ret_len;
|
||
size_t nbytes = 0;
|
||
int rc = 0;
|
||
|
||
if( control == IOBUFCTRL_UNDERFLOW ) {
|
||
assert( size ); /* need a buffer */
|
||
if ( a->eof_seen) {
|
||
rc = -1;
|
||
*ret_len = 0;
|
||
}
|
||
else {
|
||
int nread;
|
||
|
||
nread = recv ( a->sock, buf, size, 0 );
|
||
if ( nread == SOCKET_ERROR ) {
|
||
int ec = (int)WSAGetLastError ();
|
||
log_error("socket read error: ec=%d\n", ec);
|
||
rc = G10ERR_READ_FILE;
|
||
}
|
||
else if ( !nread ) {
|
||
a->eof_seen = 1;
|
||
rc = -1;
|
||
}
|
||
else {
|
||
nbytes = nread;
|
||
}
|
||
*ret_len = nbytes;
|
||
}
|
||
}
|
||
else if( control == IOBUFCTRL_FLUSH ) {
|
||
if( size ) {
|
||
byte *p = buf;
|
||
int n;
|
||
|
||
nbytes = size;
|
||
do {
|
||
n = send (a->sock, p, nbytes, 0);
|
||
if ( n == SOCKET_ERROR ) {
|
||
int ec = (int)WSAGetLastError ();
|
||
log_error("socket write error: ec=%d\n", ec);
|
||
rc = G10ERR_WRITE_FILE;
|
||
break;
|
||
}
|
||
p += n;
|
||
nbytes -= n;
|
||
} while ( nbytes );
|
||
nbytes = p - buf;
|
||
}
|
||
*ret_len = nbytes;
|
||
}
|
||
else if ( control == IOBUFCTRL_INIT ) {
|
||
a->eof_seen = 0;
|
||
a->keep_open = 0;
|
||
a->no_cache = 0;
|
||
}
|
||
else if ( control == IOBUFCTRL_DESC ) {
|
||
*(char**)buf = "sock_filter";
|
||
}
|
||
else if ( control == IOBUFCTRL_FREE ) {
|
||
if (!a->keep_open)
|
||
closesocket (a->sock);
|
||
m_free (a); /* we can free our context now */
|
||
}
|
||
return rc;
|
||
}
|
||
#endif /*_WIN32*/
|
||
|
||
/****************
|
||
* This is used to implement the block write mode.
|
||
* Block reading is done on a byte by byte basis in readbyte(),
|
||
* without a filter
|
||
*/
|
||
static int
|
||
block_filter(void *opaque, int control, IOBUF chain, byte *buf, size_t *ret_len)
|
||
{
|
||
block_filter_ctx_t *a = opaque;
|
||
size_t size = *ret_len;
|
||
int c, needed, rc = 0;
|
||
char *p;
|
||
|
||
if( control == IOBUFCTRL_UNDERFLOW ) {
|
||
size_t n=0;
|
||
|
||
p = buf;
|
||
assert( size ); /* need a buffer */
|
||
if( a->eof ) /* don't read any further */
|
||
rc = -1;
|
||
while( !rc && size ) {
|
||
if( !a->size ) { /* get the length bytes */
|
||
if( a->partial == 2 ) {
|
||
a->eof = 1;
|
||
if( !n )
|
||
rc = -1;
|
||
break;
|
||
}
|
||
else if( a->partial ) {
|
||
/* These OpenPGP introduced huffman like encoded length
|
||
* bytes are really a mess :-( */
|
||
if( a->first_c ) {
|
||
c = a->first_c;
|
||
a->first_c = 0;
|
||
}
|
||
else if( (c = iobuf_get(chain)) == -1 ) {
|
||
log_error("block_filter: 1st length byte missing\n");
|
||
rc = G10ERR_READ_FILE;
|
||
break;
|
||
}
|
||
if( c < 192 ) {
|
||
a->size = c;
|
||
a->partial = 2;
|
||
if( !a->size ) {
|
||
a->eof = 1;
|
||
if( !n )
|
||
rc = -1;
|
||
break;
|
||
}
|
||
}
|
||
else if( c < 224 ) {
|
||
a->size = (c - 192) * 256;
|
||
if( (c = iobuf_get(chain)) == -1 ) {
|
||
log_error("block_filter: 2nd length byte missing\n");
|
||
rc = G10ERR_READ_FILE;
|
||
break;
|
||
}
|
||
a->size += c + 192;
|
||
a->partial = 2;
|
||
if( !a->size ) {
|
||
a->eof = 1;
|
||
if( !n )
|
||
rc = -1;
|
||
break;
|
||
}
|
||
}
|
||
else if( c == 255 ) {
|
||
a->size = iobuf_get(chain) << 24;
|
||
a->size |= iobuf_get(chain) << 16;
|
||
a->size |= iobuf_get(chain) << 8;
|
||
if( (c = iobuf_get(chain)) == -1 ) {
|
||
log_error("block_filter: invalid 4 byte length\n");
|
||
rc = G10ERR_READ_FILE;
|
||
break;
|
||
}
|
||
a->size |= c;
|
||
a->partial = 2;
|
||
if( !a->size ) {
|
||
a->eof = 1;
|
||
if( !n )
|
||
rc = -1;
|
||
break;
|
||
}
|
||
}
|
||
else { /* next partial body length */
|
||
a->size = 1 << (c & 0x1f);
|
||
}
|
||
/* log_debug("partial: ctx=%p c=%02x size=%u\n", a, c, a->size);*/
|
||
}
|
||
else
|
||
BUG();
|
||
}
|
||
|
||
while( !rc && size && a->size ) {
|
||
needed = size < a->size ? size : a->size;
|
||
c = iobuf_read( chain, p, needed );
|
||
if( c < needed ) {
|
||
if( c == -1 ) c = 0;
|
||
log_error("block_filter %p: read error (size=%lu,a->size=%lu)\n",
|
||
a, (ulong)size+c, (ulong)a->size+c);
|
||
rc = G10ERR_READ_FILE;
|
||
}
|
||
else {
|
||
size -= c;
|
||
a->size -= c;
|
||
p += c;
|
||
n += c;
|
||
}
|
||
}
|
||
}
|
||
*ret_len = n;
|
||
}
|
||
else if( control == IOBUFCTRL_FLUSH ) {
|
||
if( a->partial ) { /* the complicated openpgp scheme */
|
||
size_t blen, n, nbytes = size + a->buflen;
|
||
|
||
assert( a->buflen <= OP_MIN_PARTIAL_CHUNK );
|
||
if( nbytes < OP_MIN_PARTIAL_CHUNK ) {
|
||
/* not enough to write a partial block out; so we store it*/
|
||
if( !a->buffer )
|
||
a->buffer = m_alloc( OP_MIN_PARTIAL_CHUNK );
|
||
memcpy( a->buffer + a->buflen, buf, size );
|
||
a->buflen += size;
|
||
}
|
||
else { /* okay, we can write out something */
|
||
/* do this in a loop to use the most efficient block lengths */
|
||
p = buf;
|
||
do {
|
||
/* find the best matching block length - this is limited
|
||
* by the size of the internal buffering */
|
||
for( blen=OP_MIN_PARTIAL_CHUNK*2,
|
||
c=OP_MIN_PARTIAL_CHUNK_2POW+1; blen <= nbytes;
|
||
blen *=2, c++ )
|
||
;
|
||
blen /= 2; c--;
|
||
/* write the partial length header */
|
||
assert( c <= 0x1f ); /*;-)*/
|
||
c |= 0xe0;
|
||
iobuf_put( chain, c );
|
||
if( (n=a->buflen) ) { /* write stuff from the buffer */
|
||
assert( n == OP_MIN_PARTIAL_CHUNK);
|
||
if( iobuf_write(chain, a->buffer, n ) )
|
||
rc = G10ERR_WRITE_FILE;
|
||
a->buflen = 0;
|
||
nbytes -= n;
|
||
}
|
||
if( (n = nbytes) > blen )
|
||
n = blen;
|
||
if( n && iobuf_write(chain, p, n ) )
|
||
rc = G10ERR_WRITE_FILE;
|
||
p += n;
|
||
nbytes -= n;
|
||
} while( !rc && nbytes >= OP_MIN_PARTIAL_CHUNK );
|
||
/* store the rest in the buffer */
|
||
if( !rc && nbytes ) {
|
||
assert( !a->buflen );
|
||
assert( nbytes < OP_MIN_PARTIAL_CHUNK );
|
||
if( !a->buffer )
|
||
a->buffer = m_alloc( OP_MIN_PARTIAL_CHUNK );
|
||
memcpy( a->buffer, p, nbytes );
|
||
a->buflen = nbytes;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
BUG();
|
||
}
|
||
else if( control == IOBUFCTRL_INIT ) {
|
||
if( DBG_IOBUF )
|
||
log_debug("init block_filter %p\n", a );
|
||
if( a->partial )
|
||
a->count = 0;
|
||
else if( a->use == 1 )
|
||
a->count = a->size = 0;
|
||
else
|
||
a->count = a->size; /* force first length bytes */
|
||
a->eof = 0;
|
||
a->buffer = NULL;
|
||
a->buflen = 0;
|
||
}
|
||
else if( control == IOBUFCTRL_DESC ) {
|
||
*(char**)buf = "block_filter";
|
||
}
|
||
else if( control == IOBUFCTRL_FREE ) {
|
||
if( a->use == 2 ) { /* write the end markers */
|
||
if( a->partial ) {
|
||
u32 len;
|
||
/* write out the remaining bytes without a partial header
|
||
* the length of this header may be 0 - but if it is
|
||
* the first block we are not allowed to use a partial header
|
||
* and frankly we can't do so, because this length must be
|
||
* a power of 2. This is _really_ complicated because we
|
||
* have to check the possible length of a packet prior
|
||
* to it's creation: a chain of filters becomes complicated
|
||
* and we need a lot of code to handle compressed packets etc.
|
||
* :-(((((((
|
||
*/
|
||
/* construct header */
|
||
len = a->buflen;
|
||
/*log_debug("partial: remaining length=%u\n", len );*/
|
||
if( len < 192 )
|
||
rc = iobuf_put(chain, len );
|
||
else if( len < 8384 ) {
|
||
if( !(rc=iobuf_put( chain, ((len-192) / 256) + 192)) )
|
||
rc = iobuf_put( chain, ((len-192) % 256));
|
||
}
|
||
else { /* use a 4 byte header */
|
||
if( !(rc=iobuf_put( chain, 0xff )) )
|
||
if( !(rc=iobuf_put( chain, (len >> 24)&0xff )) )
|
||
if( !(rc=iobuf_put( chain, (len >> 16)&0xff )) )
|
||
if( !(rc=iobuf_put( chain, (len >> 8)&0xff )))
|
||
rc=iobuf_put( chain, len & 0xff );
|
||
}
|
||
if( !rc && len )
|
||
rc = iobuf_write(chain, a->buffer, len );
|
||
if( rc ) {
|
||
log_error("block_filter: write error: %s\n",strerror(errno));
|
||
rc = G10ERR_WRITE_FILE;
|
||
}
|
||
m_free( a->buffer ); a->buffer = NULL; a->buflen = 0;
|
||
}
|
||
else
|
||
BUG();
|
||
}
|
||
else if( a->size ) {
|
||
log_error("block_filter: pending bytes!\n");
|
||
}
|
||
if( DBG_IOBUF )
|
||
log_debug("free block_filter %p\n", a );
|
||
m_free(a); /* we can free our context now */
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
static void
|
||
print_chain( IOBUF a )
|
||
{
|
||
if( !DBG_IOBUF )
|
||
return;
|
||
for(; a; a = a->chain ) {
|
||
size_t dummy_len = 0;
|
||
const char *desc = "[none]";
|
||
|
||
if( a->filter )
|
||
a->filter( a->filter_ov, IOBUFCTRL_DESC, NULL,
|
||
(byte*)&desc, &dummy_len );
|
||
|
||
log_debug("iobuf chain: %d.%d `%s' filter_eof=%d start=%d len=%d\n",
|
||
a->no, a->subno, desc, a->filter_eof,
|
||
(int)a->d.start, (int)a->d.len );
|
||
}
|
||
}
|
||
|
||
int
|
||
iobuf_print_chain( IOBUF a )
|
||
{
|
||
print_chain(a);
|
||
return 0;
|
||
}
|
||
|
||
/****************
|
||
* Allocate a new io buffer, with no function assigned.
|
||
* Use is the desired usage: 1 for input, 2 for output, 3 for temp buffer
|
||
* BUFSIZE is a suggested buffer size.
|
||
*/
|
||
IOBUF
|
||
iobuf_alloc(int use, size_t bufsize)
|
||
{
|
||
IOBUF a;
|
||
static int number=0;
|
||
|
||
a = m_alloc_clear(sizeof *a);
|
||
a->use = use;
|
||
a->d.buf = m_alloc( bufsize );
|
||
a->d.size = bufsize;
|
||
a->no = ++number;
|
||
a->subno = 0;
|
||
a->opaque = NULL;
|
||
a->real_fname = NULL;
|
||
return a;
|
||
}
|
||
|
||
int
|
||
iobuf_close ( IOBUF a )
|
||
{
|
||
IOBUF a2;
|
||
size_t dummy_len=0;
|
||
int rc=0;
|
||
|
||
if( a && a->directfp ) {
|
||
fclose( a->directfp );
|
||
m_free( a->real_fname );
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf_close -> %p\n", a->directfp );
|
||
return 0;
|
||
}
|
||
|
||
for( ; a && !rc ; a = a2 ) {
|
||
a2 = a->chain;
|
||
if( a->use == 2 && (rc=iobuf_flush(a)) )
|
||
log_error("iobuf_flush failed on close: %s\n", g10_errstr(rc));
|
||
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: close `%s'\n", a->no, a->subno, a->desc );
|
||
if( a->filter && (rc = a->filter(a->filter_ov, IOBUFCTRL_FREE,
|
||
a->chain, NULL, &dummy_len)) )
|
||
log_error("IOBUFCTRL_FREE failed on close: %s\n", g10_errstr(rc) );
|
||
m_free(a->real_fname);
|
||
if (a->d.buf) {
|
||
memset (a->d.buf, 0, a->d.size); /* erase the buffer */
|
||
m_free(a->d.buf);
|
||
}
|
||
m_free(a);
|
||
}
|
||
return rc;
|
||
}
|
||
|
||
int
|
||
iobuf_cancel( IOBUF a )
|
||
{
|
||
const char *s;
|
||
IOBUF a2;
|
||
int rc;
|
||
#if defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
|
||
char *remove_name = NULL;
|
||
#endif
|
||
|
||
if( a && a->use == 2 ) {
|
||
s = iobuf_get_real_fname(a);
|
||
if( s && *s ) {
|
||
#if defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
|
||
remove_name = m_strdup ( s );
|
||
#else
|
||
remove(s);
|
||
#endif
|
||
}
|
||
}
|
||
|
||
/* send a cancel message to all filters */
|
||
for( a2 = a; a2 ; a2 = a2->chain ) {
|
||
size_t dummy;
|
||
if( a2->filter )
|
||
a2->filter( a2->filter_ov, IOBUFCTRL_CANCEL, a2->chain,
|
||
NULL, &dummy );
|
||
}
|
||
|
||
rc = iobuf_close(a);
|
||
#if defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
|
||
if ( remove_name ) {
|
||
/* Argg, MSDOS does not allow to remove open files. So
|
||
* we have to do it here */
|
||
remove ( remove_name );
|
||
m_free ( remove_name );
|
||
}
|
||
#endif
|
||
return rc;
|
||
}
|
||
|
||
|
||
/****************
|
||
* create a temporary iobuf, which can be used to collect stuff
|
||
* in an iobuf and later be written by iobuf_write_temp() to another
|
||
* iobuf.
|
||
*/
|
||
IOBUF
|
||
iobuf_temp()
|
||
{
|
||
IOBUF a;
|
||
|
||
a = iobuf_alloc(3, 8192 );
|
||
|
||
return a;
|
||
}
|
||
|
||
IOBUF
|
||
iobuf_temp_with_content( const char *buffer, size_t length )
|
||
{
|
||
IOBUF a;
|
||
|
||
a = iobuf_alloc(3, length );
|
||
memcpy( a->d.buf, buffer, length );
|
||
a->d.len = length;
|
||
|
||
return a;
|
||
}
|
||
|
||
void
|
||
iobuf_enable_special_filenames ( int yes )
|
||
{
|
||
special_names_enabled = yes;
|
||
}
|
||
|
||
/*
|
||
* see whether the filename has the for "-&nnnn", where n is a
|
||
* non-zero number.
|
||
* Returns this number or -1 if it is not the case.
|
||
*/
|
||
static int
|
||
check_special_filename ( const char *fname )
|
||
{
|
||
if ( special_names_enabled
|
||
&& fname && *fname == '-' && fname[1] == '&' ) {
|
||
int i;
|
||
|
||
fname += 2;
|
||
for (i=0; digitp (fname+i); i++ )
|
||
;
|
||
if ( !fname[i] )
|
||
return atoi (fname);
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/* This fucntion returns true if FNAME indicates a PIPE (stdout or
|
||
stderr) or a special file name if those are enabled. */
|
||
int
|
||
iobuf_is_pipe_filename (const char *fname)
|
||
{
|
||
if (!fname || (*fname=='-' && !fname[1]) )
|
||
return 1;
|
||
return check_special_filename (fname) != -1;
|
||
}
|
||
|
||
/****************
|
||
* Create a head iobuf for reading from a file
|
||
* returns: NULL if an error occures and sets errno
|
||
*/
|
||
IOBUF
|
||
iobuf_open( const char *fname )
|
||
{
|
||
IOBUF a;
|
||
FILEP_OR_FD fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
int print_only = 0;
|
||
int fd;
|
||
|
||
if( !fname || (*fname=='-' && !fname[1]) ) {
|
||
fp = FILEP_OR_FD_FOR_STDIN;
|
||
#ifdef USE_SETMODE
|
||
setmode ( my_fileno(fp) , O_BINARY );
|
||
#endif
|
||
fname = "[stdin]";
|
||
print_only = 1;
|
||
}
|
||
else if ( (fd = check_special_filename ( fname )) != -1 )
|
||
return iobuf_fdopen ( translate_file_handle (fd,0), "rb" );
|
||
else if( (fp = my_fopen_ro(fname, "rb")) == INVALID_FP )
|
||
return NULL;
|
||
a = iobuf_alloc(1, 8192 );
|
||
fcx = m_alloc( sizeof *fcx + strlen(fname) );
|
||
fcx->fp = fp;
|
||
fcx->print_only_name = print_only;
|
||
strcpy(fcx->fname, fname );
|
||
if( !print_only )
|
||
a->real_fname = m_strdup( fname );
|
||
a->filter = file_filter;
|
||
a->filter_ov = fcx;
|
||
file_filter( fcx, IOBUFCTRL_DESC, NULL, (byte*)&a->desc, &len );
|
||
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: open `%s' fd=%d\n",
|
||
a->no, a->subno, fname, (int)my_fileno(fcx->fp) );
|
||
|
||
return a;
|
||
}
|
||
|
||
/****************
|
||
* Create a head iobuf for reading from a file
|
||
* returns: NULL if an error occures and sets errno
|
||
*/
|
||
IOBUF
|
||
iobuf_fdopen( int fd, const char *mode )
|
||
{
|
||
IOBUF a;
|
||
FILEP_OR_FD fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
|
||
#ifdef FILE_FILTER_USES_STDIO
|
||
if( !(fp = fdopen(fd, mode)) )
|
||
return NULL;
|
||
#else
|
||
fp = (FILEP_OR_FD)fd;
|
||
#endif
|
||
a = iobuf_alloc( strchr( mode, 'w')? 2:1, 8192 );
|
||
fcx = m_alloc( sizeof *fcx + 20 );
|
||
fcx->fp = fp;
|
||
fcx->print_only_name = 1;
|
||
sprintf(fcx->fname, "[fd %d]", fd );
|
||
a->filter = file_filter;
|
||
a->filter_ov = fcx;
|
||
file_filter( fcx, IOBUFCTRL_DESC, NULL, (byte*)&a->desc, &len );
|
||
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: fdopen `%s'\n", a->no, a->subno, fcx->fname );
|
||
iobuf_ioctl (a,3,1,NULL); /* disable fd caching */
|
||
return a;
|
||
}
|
||
|
||
|
||
IOBUF
|
||
iobuf_sockopen ( int fd, const char *mode )
|
||
{
|
||
IOBUF a;
|
||
#ifdef _WIN32
|
||
sock_filter_ctx_t *scx;
|
||
size_t len;
|
||
|
||
a = iobuf_alloc( strchr( mode, 'w')? 2:1, 8192 );
|
||
scx = m_alloc( sizeof *scx + 25 );
|
||
scx->sock = fd;
|
||
scx->print_only_name = 1;
|
||
sprintf(scx->fname, "[sock %d]", fd );
|
||
a->filter = sock_filter;
|
||
a->filter_ov = scx;
|
||
sock_filter( scx, IOBUFCTRL_DESC, NULL, (byte*)&a->desc, &len );
|
||
sock_filter( scx, IOBUFCTRL_INIT, NULL, NULL, &len );
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: sockopen `%s'\n", a->no, a->subno, scx->fname);
|
||
iobuf_ioctl (a,3,1,NULL); /* disable fd caching */
|
||
#else
|
||
a = iobuf_fdopen (fd, mode);
|
||
#endif
|
||
return a;
|
||
}
|
||
|
||
/****************
|
||
* create an iobuf for writing to a file; the file will be created.
|
||
*/
|
||
IOBUF
|
||
iobuf_create( const char *fname )
|
||
{
|
||
IOBUF a;
|
||
FILEP_OR_FD fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
int print_only = 0;
|
||
int fd;
|
||
|
||
if( !fname || (*fname=='-' && !fname[1]) ) {
|
||
fp = FILEP_OR_FD_FOR_STDOUT;
|
||
#ifdef USE_SETMODE
|
||
setmode ( my_fileno(fp) , O_BINARY );
|
||
#endif
|
||
fname = "[stdout]";
|
||
print_only = 1;
|
||
}
|
||
else if ( (fd = check_special_filename ( fname )) != -1 )
|
||
return iobuf_fdopen ( translate_file_handle (fd, 1), "wb" );
|
||
else if( (fp = my_fopen(fname, "wb")) == INVALID_FP )
|
||
return NULL;
|
||
a = iobuf_alloc(2, 8192 );
|
||
fcx = m_alloc( sizeof *fcx + strlen(fname) );
|
||
fcx->fp = fp;
|
||
fcx->print_only_name = print_only;
|
||
strcpy(fcx->fname, fname );
|
||
if( !print_only )
|
||
a->real_fname = m_strdup( fname );
|
||
a->filter = file_filter;
|
||
a->filter_ov = fcx;
|
||
file_filter( fcx, IOBUFCTRL_DESC, NULL, (byte*)&a->desc, &len );
|
||
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: create `%s'\n", a->no, a->subno, a->desc );
|
||
|
||
return a;
|
||
}
|
||
|
||
/****************
|
||
* append to an iobuf; if the file does not exist, create it.
|
||
* cannot be used for stdout.
|
||
* Note: This is not used.
|
||
*/
|
||
#if 0 /* not used */
|
||
IOBUF
|
||
iobuf_append( const char *fname )
|
||
{
|
||
IOBUF a;
|
||
FILE *fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
|
||
if( !fname )
|
||
return NULL;
|
||
else if( !(fp = my_fopen(fname, "ab")) )
|
||
return NULL;
|
||
a = iobuf_alloc(2, 8192 );
|
||
fcx = m_alloc( sizeof *fcx + strlen(fname) );
|
||
fcx->fp = fp;
|
||
strcpy(fcx->fname, fname );
|
||
a->real_fname = m_strdup( fname );
|
||
a->filter = file_filter;
|
||
a->filter_ov = fcx;
|
||
file_filter( fcx, IOBUFCTRL_DESC, NULL, (byte*)&a->desc, &len );
|
||
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: append `%s'\n", a->no, a->subno, a->desc );
|
||
|
||
return a;
|
||
}
|
||
#endif
|
||
|
||
IOBUF
|
||
iobuf_openrw( const char *fname )
|
||
{
|
||
IOBUF a;
|
||
FILEP_OR_FD fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
|
||
if( !fname )
|
||
return NULL;
|
||
else if( (fp = my_fopen(fname, "r+b")) == INVALID_FP )
|
||
return NULL;
|
||
a = iobuf_alloc(2, 8192 );
|
||
fcx = m_alloc( sizeof *fcx + strlen(fname) );
|
||
fcx->fp = fp;
|
||
strcpy(fcx->fname, fname );
|
||
a->real_fname = m_strdup( fname );
|
||
a->filter = file_filter;
|
||
a->filter_ov = fcx;
|
||
file_filter( fcx, IOBUFCTRL_DESC, NULL, (byte*)&a->desc, &len );
|
||
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: openrw `%s'\n", a->no, a->subno, a->desc );
|
||
|
||
return a;
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_ioctl ( IOBUF a, int cmd, int intval, void *ptrval )
|
||
{
|
||
if ( cmd == 1 ) { /* keep system filepointer/descriptor open */
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: ioctl `%s' keep=%d\n",
|
||
a? a->no:-1, a?a->subno:-1, a?a->desc:"?", intval );
|
||
for( ; a; a = a->chain )
|
||
if( !a->chain && a->filter == file_filter ) {
|
||
file_filter_ctx_t *b = a->filter_ov;
|
||
b->keep_open = intval;
|
||
return 0;
|
||
}
|
||
#ifdef _WIN32
|
||
else if( !a->chain && a->filter == sock_filter ) {
|
||
sock_filter_ctx_t *b = a->filter_ov;
|
||
b->keep_open = intval;
|
||
return 0;
|
||
}
|
||
#endif
|
||
}
|
||
else if ( cmd == 2 ) { /* invalidate cache */
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-*.*: ioctl `%s' invalidate\n",
|
||
ptrval? (char*)ptrval:"?");
|
||
if ( !a && !intval && ptrval ) {
|
||
#ifndef FILE_FILTER_USES_STDIO
|
||
fd_cache_invalidate (ptrval);
|
||
#endif
|
||
return 0;
|
||
}
|
||
}
|
||
else if ( cmd == 3 ) { /* disallow/allow caching */
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: ioctl `%s' no_cache=%d\n",
|
||
a? a->no:-1, a?a->subno:-1, a?a->desc:"?", intval );
|
||
for( ; a; a = a->chain )
|
||
if( !a->chain && a->filter == file_filter ) {
|
||
file_filter_ctx_t *b = a->filter_ov;
|
||
b->no_cache = intval;
|
||
return 0;
|
||
}
|
||
#ifdef _WIN32
|
||
else if( !a->chain && a->filter == sock_filter ) {
|
||
sock_filter_ctx_t *b = a->filter_ov;
|
||
b->no_cache = intval;
|
||
return 0;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Register an i/o filter.
|
||
*/
|
||
int
|
||
iobuf_push_filter( IOBUF a,
|
||
int (*f)(void *opaque, int control,
|
||
IOBUF chain, byte *buf, size_t *len), void *ov )
|
||
{
|
||
return iobuf_push_filter2( a, f, ov, 0 );
|
||
}
|
||
|
||
int
|
||
iobuf_push_filter2( IOBUF a,
|
||
int (*f)(void *opaque, int control,
|
||
IOBUF chain, byte *buf, size_t *len),
|
||
void *ov, int rel_ov )
|
||
{
|
||
IOBUF b;
|
||
size_t dummy_len=0;
|
||
int rc=0;
|
||
|
||
if( a->directfp )
|
||
BUG();
|
||
|
||
if( a->use == 2 && (rc=iobuf_flush(a)) )
|
||
return rc;
|
||
/* make a copy of the current stream, so that
|
||
* A is the new stream and B the original one.
|
||
* The contents of the buffers are transferred to the
|
||
* new stream.
|
||
*/
|
||
b = m_alloc(sizeof *b);
|
||
memcpy(b, a, sizeof *b );
|
||
/* fixme: it is stupid to keep a copy of the name at every level
|
||
* but we need the name somewhere because the name known by file_filter
|
||
* may have been released when we need the name of the file */
|
||
b->real_fname = a->real_fname? m_strdup(a->real_fname):NULL;
|
||
/* remove the filter stuff from the new stream */
|
||
a->filter = NULL;
|
||
a->filter_ov = NULL;
|
||
a->filter_ov_owner = 0;
|
||
a->filter_eof = 0;
|
||
if( a->use == 3 )
|
||
a->use = 2; /* make a write stream from a temp stream */
|
||
|
||
if( a->use == 2 ) { /* allocate a fresh buffer for the original stream */
|
||
b->d.buf = m_alloc( a->d.size );
|
||
b->d.len = 0;
|
||
b->d.start = 0;
|
||
}
|
||
else { /* allocate a fresh buffer for the new stream */
|
||
a->d.buf = m_alloc( a->d.size );
|
||
a->d.len = 0;
|
||
a->d.start = 0;
|
||
}
|
||
/* disable nlimit for the new stream */
|
||
a->ntotal = b->ntotal + b->nbytes;
|
||
a->nlimit = a->nbytes = 0;
|
||
a->nofast &= ~1;
|
||
/* make a link from the new stream to the original stream */
|
||
a->chain = b;
|
||
a->opaque = b->opaque;
|
||
|
||
/* setup the function on the new stream */
|
||
a->filter = f;
|
||
a->filter_ov = ov;
|
||
a->filter_ov_owner = rel_ov;
|
||
|
||
a->subno = b->subno + 1;
|
||
f( ov, IOBUFCTRL_DESC, NULL, (byte*)&a->desc, &dummy_len );
|
||
|
||
if( DBG_IOBUF ) {
|
||
log_debug("iobuf-%d.%d: push `%s'\n", a->no, a->subno, a->desc );
|
||
print_chain( a );
|
||
}
|
||
|
||
/* now we can initialize the new function if we have one */
|
||
if( a->filter && (rc = a->filter(a->filter_ov, IOBUFCTRL_INIT, a->chain,
|
||
NULL, &dummy_len)) )
|
||
log_error("IOBUFCTRL_INIT failed: %s\n", g10_errstr(rc) );
|
||
return rc;
|
||
}
|
||
|
||
/****************
|
||
* Remove an i/o filter.
|
||
*/
|
||
static int
|
||
pop_filter( IOBUF a, int (*f)(void *opaque, int control,
|
||
IOBUF chain, byte *buf, size_t *len), void *ov )
|
||
{
|
||
IOBUF b;
|
||
size_t dummy_len=0;
|
||
int rc=0;
|
||
|
||
if( a->directfp )
|
||
BUG();
|
||
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: pop `%s'\n", a->no, a->subno, a->desc );
|
||
if( !a->filter ) { /* this is simple */
|
||
b = a->chain;
|
||
assert(b);
|
||
m_free(a->d.buf);
|
||
m_free(a->real_fname);
|
||
memcpy(a,b, sizeof *a);
|
||
m_free(b);
|
||
return 0;
|
||
}
|
||
for(b=a ; b; b = b->chain )
|
||
if( b->filter == f && (!ov || b->filter_ov == ov) )
|
||
break;
|
||
if( !b )
|
||
log_bug("pop_filter(): filter function not found\n");
|
||
|
||
/* flush this stream if it is an output stream */
|
||
if( a->use == 2 && (rc=iobuf_flush(b)) ) {
|
||
log_error("iobuf_flush failed in pop_filter: %s\n", g10_errstr(rc));
|
||
return rc;
|
||
}
|
||
/* and tell the filter to free it self */
|
||
if( b->filter && (rc = b->filter(b->filter_ov, IOBUFCTRL_FREE, b->chain,
|
||
NULL, &dummy_len)) ) {
|
||
log_error("IOBUFCTRL_FREE failed: %s\n", g10_errstr(rc) );
|
||
return rc;
|
||
}
|
||
if( b->filter_ov && b->filter_ov_owner ) {
|
||
m_free( b->filter_ov );
|
||
b->filter_ov = NULL;
|
||
}
|
||
|
||
|
||
/* and see how to remove it */
|
||
if( a == b && !b->chain )
|
||
log_bug("can't remove the last filter from the chain\n");
|
||
else if( a == b ) { /* remove the first iobuf from the chain */
|
||
/* everything from b is copied to a. This is save because
|
||
* a flush has been done on the to be removed entry
|
||
*/
|
||
b = a->chain;
|
||
m_free(a->d.buf);
|
||
m_free(a->real_fname);
|
||
memcpy(a,b, sizeof *a);
|
||
m_free(b);
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: popped filter\n", a->no, a->subno );
|
||
}
|
||
else if( !b->chain ) { /* remove the last iobuf from the chain */
|
||
log_bug("Ohh jeee, trying to remove a head filter\n");
|
||
}
|
||
else { /* remove an intermediate iobuf from the chain */
|
||
log_bug("Ohh jeee, trying to remove an intermediate filter\n");
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
/****************
|
||
* read underflow: read more bytes into the buffer and return
|
||
* the first byte or -1 on EOF.
|
||
*/
|
||
static int
|
||
underflow(IOBUF a)
|
||
{
|
||
size_t len;
|
||
int rc;
|
||
|
||
assert( a->d.start == a->d.len );
|
||
if( a->use == 3 )
|
||
return -1; /* EOF because a temp buffer can't do an underflow */
|
||
|
||
if( a->filter_eof ) {
|
||
if( a->chain ) {
|
||
IOBUF b = a->chain;
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: pop `%s' in underflow\n",
|
||
a->no, a->subno, a->desc );
|
||
m_free(a->d.buf);
|
||
m_free(a->real_fname);
|
||
memcpy(a, b, sizeof *a);
|
||
m_free(b);
|
||
print_chain(a);
|
||
}
|
||
else
|
||
a->filter_eof = 0; /* for the top level filter */
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: underflow: eof (due to filter eof)\n",
|
||
a->no, a->subno );
|
||
return -1; /* return one(!) EOF */
|
||
}
|
||
if( a->error ) {
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: error\n", a->no, a->subno );
|
||
return -1;
|
||
}
|
||
|
||
if( a->directfp ) {
|
||
FILE *fp = a->directfp;
|
||
|
||
len = fread( a->d.buf, 1, a->d.size, fp);
|
||
if( len < a->d.size ) {
|
||
if( ferror(fp) )
|
||
a->error = 1;
|
||
}
|
||
a->d.len = len;
|
||
a->d.start = 0;
|
||
return len? a->d.buf[a->d.start++] : -1;
|
||
}
|
||
|
||
|
||
if( a->filter ) {
|
||
len = a->d.size;
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: underflow: req=%lu\n",
|
||
a->no, a->subno, (ulong)len );
|
||
rc = a->filter( a->filter_ov, IOBUFCTRL_UNDERFLOW, a->chain,
|
||
a->d.buf, &len );
|
||
if( DBG_IOBUF ) {
|
||
log_debug("iobuf-%d.%d: underflow: got=%lu rc=%d\n",
|
||
a->no, a->subno, (ulong)len, rc );
|
||
/* if( a->no == 1 ) */
|
||
/* log_hexdump (" data:", a->d.buf, len); */
|
||
}
|
||
if( a->use == 1 && rc == -1 ) { /* EOF: we can remove the filter */
|
||
size_t dummy_len=0;
|
||
|
||
/* and tell the filter to free itself */
|
||
if( (rc = a->filter(a->filter_ov, IOBUFCTRL_FREE, a->chain,
|
||
NULL, &dummy_len)) )
|
||
log_error("IOBUFCTRL_FREE failed: %s\n", g10_errstr(rc) );
|
||
if( a->filter_ov && a->filter_ov_owner ) {
|
||
m_free( a->filter_ov );
|
||
a->filter_ov = NULL;
|
||
}
|
||
a->filter = NULL;
|
||
a->desc = NULL;
|
||
a->filter_ov = NULL;
|
||
a->filter_eof = 1;
|
||
if( !len && a->chain ) {
|
||
IOBUF b = a->chain;
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: pop `%s' in underflow (!len)\n",
|
||
a->no, a->subno, a->desc );
|
||
m_free(a->d.buf);
|
||
m_free(a->real_fname);
|
||
memcpy(a,b, sizeof *a);
|
||
m_free(b);
|
||
print_chain(a);
|
||
}
|
||
}
|
||
else if( rc )
|
||
a->error = 1;
|
||
|
||
if( !len ) {
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: underflow: eof\n", a->no, a->subno );
|
||
return -1;
|
||
}
|
||
a->d.len = len;
|
||
a->d.start = 0;
|
||
return a->d.buf[a->d.start++];
|
||
}
|
||
else {
|
||
if( DBG_IOBUF )
|
||
log_debug("iobuf-%d.%d: underflow: eof (no filter)\n",
|
||
a->no, a->subno );
|
||
return -1; /* no filter; return EOF */
|
||
}
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_flush(IOBUF a)
|
||
{
|
||
size_t len;
|
||
int rc;
|
||
|
||
if( a->directfp )
|
||
return 0;
|
||
|
||
if( a->use == 3 ) { /* increase the temp buffer */
|
||
char *newbuf;
|
||
size_t newsize = a->d.size + 8192;
|
||
|
||
if( DBG_IOBUF )
|
||
log_debug("increasing temp iobuf from %lu to %lu\n",
|
||
(ulong)a->d.size, (ulong)newsize );
|
||
newbuf = m_alloc( newsize );
|
||
memcpy( newbuf, a->d.buf, a->d.len );
|
||
m_free(a->d.buf);
|
||
a->d.buf = newbuf;
|
||
a->d.size = newsize;
|
||
return 0;
|
||
}
|
||
else if( a->use != 2 )
|
||
log_bug("flush on non-output iobuf\n");
|
||
else if( !a->filter )
|
||
log_bug("iobuf_flush: no filter\n");
|
||
len = a->d.len;
|
||
rc = a->filter( a->filter_ov, IOBUFCTRL_FLUSH, a->chain, a->d.buf, &len );
|
||
if( !rc && len != a->d.len ) {
|
||
log_info("iobuf_flush did not write all!\n");
|
||
rc = G10ERR_WRITE_FILE;
|
||
}
|
||
else if( rc )
|
||
a->error = 1;
|
||
a->d.len = 0;
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Read a byte from the iobuf; returns -1 on EOF
|
||
*/
|
||
int
|
||
iobuf_readbyte(IOBUF a)
|
||
{
|
||
int c;
|
||
|
||
/* nlimit does not work together with unget */
|
||
/* nbytes is also not valid! */
|
||
if( a->unget.buf ) {
|
||
if( a->unget.start < a->unget.len )
|
||
return a->unget.buf[a->unget.start++];
|
||
m_free(a->unget.buf);
|
||
a->unget.buf = NULL;
|
||
a->nofast &= ~2;
|
||
}
|
||
|
||
if( a->nlimit && a->nbytes >= a->nlimit )
|
||
return -1; /* forced EOF */
|
||
|
||
if( a->d.start < a->d.len ) {
|
||
c = a->d.buf[a->d.start++];
|
||
}
|
||
else if( (c=underflow(a)) == -1 )
|
||
return -1; /* EOF */
|
||
|
||
a->nbytes++;
|
||
return c;
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_read(IOBUF a, byte *buf, unsigned buflen )
|
||
{
|
||
int c, n;
|
||
|
||
if( a->unget.buf || a->nlimit ) {
|
||
/* handle special cases */
|
||
for(n=0 ; n < buflen; n++ ) {
|
||
if( (c = iobuf_readbyte(a)) == -1 ) {
|
||
if( !n )
|
||
return -1; /* eof */
|
||
break;
|
||
}
|
||
else
|
||
if( buf ) *buf = c;
|
||
if( buf ) buf++;
|
||
}
|
||
return n;
|
||
}
|
||
|
||
n = 0;
|
||
do {
|
||
if( n < buflen && a->d.start < a->d.len ) {
|
||
unsigned size = a->d.len - a->d.start;
|
||
if( size > buflen - n )
|
||
size = buflen - n;
|
||
if( buf )
|
||
memcpy( buf, a->d.buf + a->d.start, size );
|
||
n += size;
|
||
a->d.start += size;
|
||
if( buf )
|
||
buf += size;
|
||
}
|
||
if( n < buflen ) {
|
||
if( (c=underflow(a)) == -1 ) {
|
||
a->nbytes += n;
|
||
return n? n : -1/*EOF*/;
|
||
}
|
||
if( buf )
|
||
*buf++ = c;
|
||
n++;
|
||
}
|
||
} while( n < buflen );
|
||
a->nbytes += n;
|
||
return n;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Have a look at the iobuf.
|
||
* NOTE: This only works in special cases.
|
||
*/
|
||
int
|
||
iobuf_peek(IOBUF a, byte *buf, unsigned buflen )
|
||
{
|
||
int n=0;
|
||
|
||
if( a->filter_eof )
|
||
return -1;
|
||
|
||
if( !(a->d.start < a->d.len) ) {
|
||
if( underflow(a) == -1 )
|
||
return -1;
|
||
/* and unget this character */
|
||
assert(a->d.start == 1);
|
||
a->d.start = 0;
|
||
}
|
||
|
||
for(n=0 ; n < buflen && (a->d.start+n) < a->d.len ; n++, buf++ )
|
||
*buf = a->d.buf[n];
|
||
return n;
|
||
}
|
||
|
||
|
||
|
||
|
||
int
|
||
iobuf_writebyte(IOBUF a, unsigned c)
|
||
{
|
||
|
||
if( a->directfp )
|
||
BUG();
|
||
|
||
if( a->d.len == a->d.size )
|
||
if( iobuf_flush(a) )
|
||
return -1;
|
||
|
||
assert( a->d.len < a->d.size );
|
||
a->d.buf[a->d.len++] = c;
|
||
return 0;
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_write(IOBUF a, byte *buf, unsigned buflen )
|
||
{
|
||
|
||
if( a->directfp )
|
||
BUG();
|
||
|
||
do {
|
||
if( buflen && a->d.len < a->d.size ) {
|
||
unsigned size = a->d.size - a->d.len;
|
||
if( size > buflen ) size = buflen;
|
||
memcpy( a->d.buf + a->d.len, buf, size );
|
||
buflen -= size;
|
||
buf += size;
|
||
a->d.len += size;
|
||
}
|
||
if( buflen ) {
|
||
if( iobuf_flush(a) )
|
||
return -1;
|
||
}
|
||
} while( buflen );
|
||
return 0;
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_writestr(IOBUF a, const char *buf )
|
||
{
|
||
for( ; *buf; buf++ )
|
||
if( iobuf_writebyte(a, *buf) )
|
||
return -1;
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/****************
|
||
* copy the contents of TEMP to A.
|
||
*/
|
||
int
|
||
iobuf_write_temp( IOBUF a, IOBUF temp )
|
||
{
|
||
while( temp->chain )
|
||
pop_filter( temp, temp->filter, NULL );
|
||
return iobuf_write(a, temp->d.buf, temp->d.len );
|
||
}
|
||
|
||
/****************
|
||
* copy the contents of the temp io stream to BUFFER.
|
||
*/
|
||
size_t
|
||
iobuf_temp_to_buffer( IOBUF a, byte *buffer, size_t buflen )
|
||
{
|
||
size_t n = a->d.len;
|
||
|
||
if( n > buflen )
|
||
n = buflen;
|
||
memcpy( buffer, a->d.buf, n );
|
||
return n;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Call this function to terminate processing of the temp stream
|
||
* without closing it. This removes all filters from the stream
|
||
* makes sure that iobuf_get_temp_{buffer,length}() returns correct
|
||
* values.
|
||
*/
|
||
void
|
||
iobuf_flush_temp( IOBUF temp )
|
||
{
|
||
while( temp->chain )
|
||
pop_filter( temp, temp->filter, NULL );
|
||
}
|
||
|
||
|
||
/****************
|
||
* Set a limit on how many bytes may be read from the input stream A.
|
||
* Setting the limit to 0 disables this feature.
|
||
*/
|
||
void
|
||
iobuf_set_limit( IOBUF a, off_t nlimit )
|
||
{
|
||
if( nlimit )
|
||
a->nofast |= 1;
|
||
else
|
||
a->nofast &= ~1;
|
||
a->nlimit = nlimit;
|
||
a->ntotal += a->nbytes;
|
||
a->nbytes = 0;
|
||
}
|
||
|
||
|
||
|
||
/****************
|
||
* Return the length of an open file
|
||
*/
|
||
off_t
|
||
iobuf_get_filelength( IOBUF a )
|
||
{
|
||
struct stat st;
|
||
|
||
if( a->directfp ) {
|
||
FILE *fp = a->directfp;
|
||
|
||
if( !fstat(fileno(fp), &st) )
|
||
return st.st_size;
|
||
log_error("fstat() failed: %s\n", strerror(errno) );
|
||
return 0;
|
||
}
|
||
|
||
/* Hmmm: file_filter may have already been removed */
|
||
for( ; a; a = a->chain )
|
||
if( !a->chain && a->filter == file_filter ) {
|
||
file_filter_ctx_t *b = a->filter_ov;
|
||
FILEP_OR_FD fp = b->fp;
|
||
|
||
#if defined(HAVE_DOSISH_SYSTEM) && !defined(FILE_FILTER_USES_STDIO)
|
||
ulong size;
|
||
|
||
if ((size=GetFileSize (fp, NULL)) != 0xffffffff)
|
||
return size;
|
||
log_error ("GetFileSize for handle %p failed: %s\n",
|
||
fp, w32_strerror (0));
|
||
#else
|
||
if( !fstat(my_fileno(fp), &st) )
|
||
return st.st_size;
|
||
log_error("fstat() failed: %s\n", strerror(errno) );
|
||
#endif
|
||
break;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Return the file descriptor of the underlying file or -1 if it is
|
||
not available. */
|
||
int
|
||
iobuf_get_fd (IOBUF a)
|
||
{
|
||
if (a->directfp)
|
||
return fileno ( (FILE*)a->directfp );
|
||
|
||
for ( ; a; a = a->chain )
|
||
if (!a->chain && a->filter == file_filter)
|
||
{
|
||
file_filter_ctx_t *b = a->filter_ov;
|
||
FILEP_OR_FD fp = b->fp;
|
||
|
||
return my_fileno (fp);
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Tell the file position, where the next read will take place
|
||
*/
|
||
off_t
|
||
iobuf_tell( IOBUF a )
|
||
{
|
||
return a->ntotal + a->nbytes;
|
||
}
|
||
|
||
|
||
#if !defined(HAVE_FSEEKO) && !defined(fseeko)
|
||
|
||
#ifdef HAVE_LIMITS_H
|
||
# include <limits.h>
|
||
#endif
|
||
#ifndef LONG_MAX
|
||
# define LONG_MAX ((long) ((unsigned long) -1 >> 1))
|
||
#endif
|
||
#ifndef LONG_MIN
|
||
# define LONG_MIN (-1 - LONG_MAX)
|
||
#endif
|
||
|
||
/****************
|
||
* A substitute for fseeko, for hosts that don't have it.
|
||
*/
|
||
static int
|
||
fseeko( FILE *stream, off_t newpos, int whence )
|
||
{
|
||
while( newpos != (long) newpos ) {
|
||
long pos = newpos < 0 ? LONG_MIN : LONG_MAX;
|
||
if( fseek( stream, pos, whence ) != 0 )
|
||
return -1;
|
||
newpos -= pos;
|
||
whence = SEEK_CUR;
|
||
}
|
||
return fseek( stream, (long)newpos, whence );
|
||
}
|
||
#endif
|
||
|
||
/****************
|
||
* This is a very limited implementation. It simply discards all internal
|
||
* buffering and removes all filters but the first one.
|
||
*/
|
||
int
|
||
iobuf_seek( IOBUF a, off_t newpos )
|
||
{
|
||
file_filter_ctx_t *b = NULL;
|
||
|
||
if( a->directfp ) {
|
||
FILE *fp = a->directfp;
|
||
if( fseeko( fp, newpos, SEEK_SET ) ) {
|
||
log_error("can't seek: %s\n", strerror(errno) );
|
||
return -1;
|
||
}
|
||
clearerr(fp);
|
||
}
|
||
else {
|
||
for( ; a; a = a->chain ) {
|
||
if( !a->chain && a->filter == file_filter ) {
|
||
b = a->filter_ov;
|
||
break;
|
||
}
|
||
}
|
||
if( !a )
|
||
return -1;
|
||
#ifdef FILE_FILTER_USES_STDIO
|
||
if( fseeko( b->fp, newpos, SEEK_SET ) ) {
|
||
log_error("can't fseek: %s\n", strerror(errno) );
|
||
return -1;
|
||
}
|
||
#else
|
||
#ifdef HAVE_DOSISH_SYSTEM
|
||
if (SetFilePointer (b->fp, newpos, NULL, FILE_BEGIN) == 0xffffffff ) {
|
||
log_error ("SetFilePointer failed on handle %p: %s\n",
|
||
b->fp, w32_strerror (0));
|
||
return -1;
|
||
}
|
||
#else
|
||
if ( lseek (b->fp, newpos, SEEK_SET) == (off_t)-1 ) {
|
||
log_error("can't lseek: %s\n", strerror(errno) );
|
||
return -1;
|
||
}
|
||
#endif
|
||
#endif
|
||
}
|
||
a->d.len = 0; /* discard buffer */
|
||
a->d.start = 0;
|
||
a->nbytes = 0;
|
||
a->nlimit = 0;
|
||
a->nofast &= ~1;
|
||
a->ntotal = newpos;
|
||
a->error = 0;
|
||
/* remove filters, but the last */
|
||
if( a->chain )
|
||
log_debug("pop_filter called in iobuf_seek - please report\n");
|
||
while( a->chain )
|
||
pop_filter( a, a->filter, NULL );
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
|
||
/****************
|
||
* Retrieve the real filename
|
||
*/
|
||
const char *
|
||
iobuf_get_real_fname( IOBUF a )
|
||
{
|
||
if( a->real_fname )
|
||
return a->real_fname;
|
||
|
||
/* the old solution */
|
||
for( ; a; a = a->chain )
|
||
if( !a->chain && a->filter == file_filter ) {
|
||
file_filter_ctx_t *b = a->filter_ov;
|
||
return b->print_only_name? NULL : b->fname;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Retrieve the filename
|
||
*/
|
||
const char *
|
||
iobuf_get_fname( IOBUF a )
|
||
{
|
||
for( ; a; a = a->chain )
|
||
if( !a->chain && a->filter == file_filter ) {
|
||
file_filter_ctx_t *b = a->filter_ov;
|
||
return b->fname;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/****************
|
||
* enable partial block mode as described in the OpenPGP draft.
|
||
* LEN is the first length byte on read, but ignored on writes.
|
||
*/
|
||
void
|
||
iobuf_set_partial_block_mode( IOBUF a, size_t len )
|
||
{
|
||
block_filter_ctx_t *ctx = m_alloc_clear( sizeof *ctx );
|
||
|
||
assert( a->use == 1 || a->use == 2 );
|
||
ctx->use = a->use;
|
||
if( !len ) {
|
||
if( a->use == 1 )
|
||
log_debug("pop_filter called in set_partial_block_mode"
|
||
" - please report\n");
|
||
pop_filter(a, block_filter, NULL );
|
||
}
|
||
else {
|
||
ctx->partial = 1;
|
||
ctx->size = 0;
|
||
ctx->first_c = len;
|
||
iobuf_push_filter(a, block_filter, ctx );
|
||
}
|
||
}
|
||
|
||
|
||
/****************
|
||
* Same as fgets() but if the buffer is too short a larger one will
|
||
* be allocated up to some limit *max_length.
|
||
* A line is considered a byte stream ending in a LF.
|
||
* Returns the length of the line. EOF is indicated by a line of
|
||
* length zero. The last LF may be missing due to an EOF.
|
||
* is max_length is zero on return, the line has been truncated.
|
||
*
|
||
* Note: The buffer is allocated with enough space to append a CR,LF,EOL
|
||
*/
|
||
unsigned
|
||
iobuf_read_line( IOBUF a, byte **addr_of_buffer,
|
||
unsigned *length_of_buffer, unsigned *max_length )
|
||
{
|
||
int c;
|
||
char *buffer = *addr_of_buffer;
|
||
unsigned length = *length_of_buffer;
|
||
unsigned nbytes = 0;
|
||
unsigned maxlen = *max_length;
|
||
char *p;
|
||
|
||
if( !buffer ) { /* must allocate a new buffer */
|
||
length = 256;
|
||
buffer = m_alloc( length );
|
||
*addr_of_buffer = buffer;
|
||
*length_of_buffer = length;
|
||
}
|
||
|
||
length -= 3; /* reserve 3 bytes (cr,lf,eol) */
|
||
p = buffer;
|
||
while( (c=iobuf_get(a)) != -1 ) {
|
||
if( nbytes == length ) { /* increase the buffer */
|
||
if( length > maxlen ) { /* this is out limit */
|
||
/* skip the rest of the line */
|
||
while( c != '\n' && (c=iobuf_get(a)) != -1 )
|
||
;
|
||
*p++ = '\n'; /* always append a LF (we have reserved space) */
|
||
nbytes++;
|
||
*max_length = 0; /* indicate truncation */
|
||
break;
|
||
}
|
||
length += 3; /* correct for the reserved byte */
|
||
length += length < 1024? 256 : 1024;
|
||
buffer = m_realloc( buffer, length );
|
||
*addr_of_buffer = buffer;
|
||
*length_of_buffer = length;
|
||
length -= 3; /* and reserve again */
|
||
p = buffer + nbytes;
|
||
}
|
||
*p++ = c;
|
||
nbytes++;
|
||
if( c == '\n' )
|
||
break;
|
||
}
|
||
*p = 0; /* make sure the line is a string */
|
||
|
||
return nbytes;
|
||
}
|
||
|
||
/* This is the non iobuf specific function */
|
||
int
|
||
iobuf_translate_file_handle ( int fd, int for_write )
|
||
{
|
||
#ifdef _WIN32
|
||
{
|
||
int x;
|
||
|
||
if ( fd <= 2 )
|
||
return fd; /* do not do this for error, stdin, stdout, stderr */
|
||
|
||
x = _open_osfhandle ( fd, for_write? 1:0 );
|
||
if (x==-1 )
|
||
log_error ("failed to translate osfhandle %p\n", (void*)fd );
|
||
else {
|
||
/*log_info ("_open_osfhandle %p yields %d%s\n",
|
||
(void*)fd, x, for_write? " for writing":"" );*/
|
||
fd = x;
|
||
}
|
||
}
|
||
#endif
|
||
return fd;
|
||
}
|
||
|
||
static int
|
||
translate_file_handle ( int fd, int for_write )
|
||
{
|
||
#ifdef _WIN32
|
||
#ifdef FILE_FILTER_USES_STDIO
|
||
fd = iobuf_translate_file_handle (fd, for_write);
|
||
#else
|
||
{
|
||
int x;
|
||
|
||
if ( fd == 0 )
|
||
x = (int)GetStdHandle (STD_INPUT_HANDLE);
|
||
else if (fd == 1)
|
||
x = (int)GetStdHandle (STD_OUTPUT_HANDLE);
|
||
else if (fd == 2)
|
||
x = (int)GetStdHandle (STD_ERROR_HANDLE);
|
||
else
|
||
x = fd;
|
||
|
||
if (x == -1)
|
||
log_debug ("GetStdHandle(%d) failed: %s\n",
|
||
fd, w32_strerror (0));
|
||
|
||
fd = x;
|
||
}
|
||
#endif
|
||
#endif
|
||
return fd;
|
||
}
|
||
|
||
|
||
void
|
||
iobuf_skip_rest(IOBUF a, unsigned long n, int partial)
|
||
{
|
||
if ( partial ) {
|
||
for (;;) {
|
||
if (a->nofast || a->d.start >= a->d.len) {
|
||
if (iobuf_readbyte (a) == -1) {
|
||
break;
|
||
}
|
||
} else {
|
||
unsigned long count = a->d.len - a->d.start;
|
||
a->nbytes += count;
|
||
a->d.start = a->d.len;
|
||
}
|
||
}
|
||
} else {
|
||
unsigned long remaining = n;
|
||
while (remaining > 0) {
|
||
if (a->nofast || a->d.start >= a->d.len) {
|
||
if (iobuf_readbyte (a) == -1) {
|
||
break;
|
||
}
|
||
--remaining;
|
||
} else {
|
||
unsigned long count = a->d.len - a->d.start;
|
||
if (count > remaining) {
|
||
count = remaining;
|
||
}
|
||
a->nbytes += count;
|
||
a->d.start += count;
|
||
remaining -= count;
|
||
}
|
||
}
|
||
}
|
||
}
|