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103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/* keybox-file.c - file oeprations
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* Copyright (C) 2001, 2003 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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "keybox-defs.h"
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/* Read a block at the current postion and return it in r_blob.
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r_blob may be NULL to simply skip the current block */
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int
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_keybox_read_blob (KEYBOXBLOB *r_blob, FILE *fp)
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{
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char *image;
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size_t imagelen = 0;
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int c1, c2, c3, c4, type;
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int rc;
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off_t off;
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again:
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*r_blob = NULL;
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off = ftello (fp);
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if (off == (off_t)-1)
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return gpg_error (gpg_err_code_from_errno (errno));
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if ((c1 = getc (fp)) == EOF
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|| (c2 = getc (fp)) == EOF
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|| (c3 = getc (fp)) == EOF
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|| (c4 = getc (fp)) == EOF
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|| (type = getc (fp)) == EOF)
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{
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if ( c1 == EOF && !ferror (fp) )
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return -1; /* eof */
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return gpg_error (gpg_err_code_from_errno (errno));
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}
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imagelen = (c1 << 24) | (c2 << 16) | (c3 << 8 ) | c4;
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if (imagelen > 500000) /* sanity check */
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return gpg_error (GPG_ERR_TOO_LARGE);
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if (imagelen < 5)
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return gpg_error (GPG_ERR_TOO_SHORT);
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if (!type)
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{
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/* special treatment for empty blobs. */
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if (fseek (fp, imagelen-5, SEEK_CUR))
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return gpg_error (gpg_err_code_from_errno (errno));
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goto again;
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}
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image = xtrymalloc (imagelen);
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if (!image)
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return gpg_error (gpg_err_code_from_errno (errno));
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image[0] = c1; image[1] = c2; image[2] = c3; image[3] = c4; image[4] = type;
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if (fread (image+5, imagelen-5, 1, fp) != 1)
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{
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gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
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xfree (image);
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return tmperr;
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}
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rc = r_blob? _keybox_new_blob (r_blob, image, imagelen, off) : 0;
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if (rc || !r_blob)
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xfree (image);
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return rc;
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}
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/* Write the block to the current file position */
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int
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_keybox_write_blob (KEYBOXBLOB blob, FILE *fp)
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{
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const char *image;
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size_t length;
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image = _keybox_get_blob_image (blob, &length);
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if (fwrite (image, length, 1, fp) != 1)
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return gpg_error (gpg_err_code_from_errno (errno));
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return 0;
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}
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