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OpenPGP: simplify gnuk_write_certificate() 

- get rid of unnecessary variables
- use for-loop to initialize/check/increase run variable in one place
- restrict variables to the necessary scope
- use ternary operator inside a statement instead of if...else...
This commit is contained in:
Peter Marschall 2015-09-14 22:27:43 +02:00
parent d2b1c8228f
commit 1a05f968bd
1 changed files with 11 additions and 26 deletions
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37
src/libopensc/card-openpgp.c
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@ -1269,18 +1269,11 @@ pgp_get_data(sc_card_t *card, unsigned int tag, u8 *buf, size_t buf_len)
/* Internal: Write certificate for Gnuk */
static int gnuk_write_certificate(sc_card_t *card, const u8 *buf, size_t length)
{
sc_context_t *ctx = card->ctx;
size_t i = 0;
sc_apdu_t apdu;
u8 *part;
size_t plen;
/* Two round_ variables below are to build APDU data
* with even length for Gnuk */
u8 roundbuf[256];
size_t roundlen = 0;
int r = SC_SUCCESS;
LOG_FUNC_CALLED(ctx);
LOG_FUNC_CALLED(card->ctx);
/* If null data is passed, delete certificate */
if (buf == NULL || length == 0) {
@ -1294,31 +1287,25 @@ static int gnuk_write_certificate(sc_card_t *card, const u8 *buf, size_t length)
/* Ref: gnuk_put_binary_libusb.py and gnuk_token.py in Gnuk source tree */
/* Split data to segments of 256 bytes. Send each segment via command chaining,
* with particular P1 byte for each segment */
while (i*256 < length) {
part = (u8 *)buf + i*256;
plen = MIN(length - i*256, 256);
for (i = 0; i*256 < length; i++) {
u8 *part = (u8 *)buf + i*256;
size_t plen = MIN(length - i*256, 256);
u8 roundbuf[256]; /* space to build APDU data with even length for Gnuk */
sc_log(card->ctx, "Write part %d from offset 0x%X, len %d", i+1, part, plen);
if (i == 0) {
sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xD6, 0x85, 0);
}
else {
sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xD6, i, 0);
}
/* 1st chunk: P1 = 0x85, further chunks: P1 = chunk no */
sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xD6, (i == 0) ? 0x85 : i, 0);
apdu.flags |= SC_APDU_FLAGS_CHAINING;
apdu.data = part;
apdu.datalen = apdu.lc = plen;
/* If the last part has odd length, we add zero padding to make it even.
* Gnuk does not allow data with odd length */
if (plen < 256 && (plen % 2) != 0) {
roundlen = plen + 1;
memset(roundbuf, 0, roundlen);
memcpy(roundbuf, part, plen);
roundbuf[plen++] = 0;
apdu.data = roundbuf;
apdu.datalen = apdu.lc = roundlen;
}
else {
apdu.data = part;
apdu.datalen = apdu.lc = plen;
}
@ -1326,10 +1313,8 @@ static int gnuk_write_certificate(sc_card_t *card, const u8 *buf, size_t length)
LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
/* Check response */
LOG_TEST_RET(card->ctx, sc_check_sw(card, apdu.sw1, apdu.sw2), "UPDATE BINARY returned error");
/* To next part */
i++;
}
LOG_FUNC_RETURN(card->ctx, (int)length);
}