124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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PCSCv2part10.c: helper functions for PC/SC v2 part 10 services
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Copyright (C) 2012 Ludovic Rousseau
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <arpa/inet.h>
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#ifdef __APPLE__
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#include <PCSC/winscard.h>
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#include <PCSC/wintypes.h>
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#else
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#include <winscard.h>
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#endif
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#include "PCSCv2part10.h"
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int PCSCv2Part10_find_TLV_property_by_tag_from_buffer(
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unsigned char *buffer, int length, int property, int * value_int)
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{
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unsigned char *p;
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int found = 0, len;
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int value = -1;
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int ret = -1; /* not found by default */
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p = buffer;
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while (p-buffer < length)
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{
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if (*p++ == property)
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{
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found = 1;
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break;
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}
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/* go to next tag */
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len = *p++;
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p += len;
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}
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if (found)
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{
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len = *p++;
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ret = 0;
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switch(len)
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{
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case 1:
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value = *p;
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break;
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case 2:
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value = *p + (*(p+1)<<8);
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break;
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case 4:
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value = *p + (*(p+1)<<8) + (*(p+2)<<16) + (*(p+3)<<24);
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break;
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default:
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/* wrong length for an integer */
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ret = -2;
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}
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}
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if (value_int)
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*value_int = value;
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return ret;
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} /* PCSCv2Part10_find_TLV_property_by_tag_from_buffer */
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int PCSCv2Part10_find_TLV_property_by_tag_from_hcard(SCARDHANDLE hCard,
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int property, int * value)
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{
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unsigned char buffer[MAX_BUFFER_SIZE];
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LONG rv;
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DWORD length;
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unsigned int i;
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PCSC_TLV_STRUCTURE *pcsc_tlv;
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DWORD properties_in_tlv_ioctl;
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int found;
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rv = SCardControl(hCard, CM_IOCTL_GET_FEATURE_REQUEST, NULL, 0,
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buffer, sizeof buffer, &length);
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if (rv != SCARD_S_SUCCESS)
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return -1;
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/* get the number of elements instead of the complete size */
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length /= sizeof(PCSC_TLV_STRUCTURE);
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pcsc_tlv = (PCSC_TLV_STRUCTURE *)buffer;
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found = 0;
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for (i = 0; i < length; i++)
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{
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if (FEATURE_GET_TLV_PROPERTIES == pcsc_tlv[i].tag)
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{
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properties_in_tlv_ioctl = ntohl(pcsc_tlv[i].value);
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found = 1;
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}
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}
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if (! found)
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return -3;
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rv= SCardControl(hCard, properties_in_tlv_ioctl, NULL, 0,
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buffer, sizeof buffer, &length);
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if (rv != SCARD_S_SUCCESS)
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return -1;
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return PCSCv2Part10_find_TLV_property_by_tag_from_buffer(buffer,
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length, property, value);
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}
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