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card_emu: Clarify and differentiate F/Fi/F_index/Fi_index

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The ISO7816 spec terms are well-defined, let's not abuse them. We used
to consider "Fi" as the "index into the table of F values", while the
spec actually considers Fi as the initial value for F.

Let's make sure we use the terms quite clearly:
* Fi and Di are the initial values for F and D
* F*_index and D*_index are the indexes into the ISO7816-3 Tables

Furthermore, let's track Fi separately from F, as e.g. the waiting
time definition only considers Fi as indicated in the ATR, despite
an actually different F value might have been negotiated via PTS
meanwhile.

Change-Id: Ieb2425e8380a81b79df7b2bd072902994e9c3ee7
This commit is contained in:
Harald Welte
2021-04-05 17:55:54 +02:00
parent d7af9be9b6
commit eb1b0b3133
2 changed files with 45 additions and 25 deletions
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8
firmware/libcommon/include/simtrace_prot.h
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@@ -231,10 +231,10 @@ struct cardemu_usb_msg_status {
/* phone-applied target voltage in mV */
uint16_t voltage_mv;
/* Fi/Di related information */
uint8_t fi;
uint8_t di;
uint8_t wi;
uint32_t waiting_time;
uint8_t F_index; /* <! Index to ISO7816-3 Table 7 (F and f_max values) */
uint8_t D_index; /* <! Index into ISO7816-3 Table 8 (D value) */
uint8_t wi; /* <! Waiting Integer as defined in ISO7816-3 Section 10.2 */
uint32_t waiting_time; /* <! Waiting Time in etu as defined in ISO7816-3 Section 8.1 */
} __attribute__ ((packed));
/* CEMU_USB_MSGT_DO_PTS */