From cf7c06297d04bade9cd04c056f9ed510e64dd7bd Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Wed, 5 Aug 2020 03:39:22 +0200
Subject: code -> fw

---
 fw/esp32/components/eos/gsm.c | 453 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 453 insertions(+)
 create mode 100644 fw/esp32/components/eos/gsm.c

(limited to 'fw/esp32/components/eos/gsm.c')

diff --git a/fw/esp32/components/eos/gsm.c b/fw/esp32/components/eos/gsm.c
new file mode 100644
index 0000000..788722e
--- /dev/null
+++ b/fw/esp32/components/eos/gsm.c
@@ -0,0 +1,453 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "gsm.h"
+
+#define DIVC(x,y)                   ((x) / (y) + ((x) % (y) != 0))
+
+uint8_t pdu_getc(char *pdu) {
+    int ch;
+    sscanf(pdu, "%2X", &ch);
+    return ch;
+}
+
+void pdu_putc(uint8_t ch, char *pdu) {
+    sprintf(pdu, "%.2X", ch);
+}
+
+void pdu_puts(uint8_t *s, int s_len, char *pdu) {
+    int i;
+
+    for (i=0; i<s_len; i++) {
+        sprintf(pdu + 2 * i, "%.2X", s[i]);
+    }
+}
+
+void pdu_gets(char *pdu, uint8_t *s, int s_len) {
+    int i, ch;
+
+    for (i=0; i<s_len; i++) {
+        sscanf(pdu + 2 * i, "%2X", &ch);
+        s[i] = ch;
+    }
+}
+
+void gsm_dcs_dec(uint8_t dcs, uint8_t *enc, uint16_t *flags) {
+    if ((dcs & GSM_DCS_GENERAL_IND) == 0) {
+        *enc = dcs & GSM_DCS_ENC;
+        if (dcs & GSM_DCS_CLASS_IND) {
+            *flags |= GSM_FLAG_CLASS;
+            *flags |= (uint16_t)(dcs & GSM_DCS_CLASS) << 8;
+        }
+        if (dcs & GSM_DCS_COMPRESS_IND) *flags |= GSM_FLAG_COMPRESS;
+        if (dcs & GSM_DCS_DELETE_IND) *flags |= GSM_FLAG_DELETE;
+    } else {
+        uint8_t group = dcs & GSM_DCS_GROUP;
+
+        switch (group) {
+            case GSM_DCS_MWI_DISCARD:
+            case GSM_DCS_MWI_STORE_GSM7:
+            case GSM_DCS_MWI_STORE_UCS2:
+                if (group == GSM_DCS_MWI_STORE_UCS2) {
+                    *enc = GSM_ENC_UCS2;
+                } else {
+                    *enc = GSM_ENC_7BIT;
+                }
+                if (GSM_DCS_MWI_DISCARD) *flags |= GSM_FLAG_DISCARD;
+                *flags |= GSM_FLAG_MWI;
+                *flags |= (uint16_t)(dcs & (GSM_DCS_MWI_SENSE | GSM_DCS_MWI_TYPE)) << 12;
+                break;
+
+            case GSM_DCS_ENCLASS:
+                *flags |= GSM_FLAG_CLASS;
+                *flags |= (uint16_t)(dcs & GSM_DCS_CLASS) << 8;
+                *enc = dcs & GSM_DCS_ENCLASS_ENC ? GSM_ENC_8BIT : GSM_ENC_7BIT;
+                break;
+        }
+    }
+}
+
+void gsm_dcs_enc(uint8_t enc, uint16_t flags, uint8_t *dcs) {
+    *dcs = enc;
+    if (flags & GSM_FLAG_CLASS) {
+        *dcs |= GSM_DCS_CLASS_IND;
+        *dcs |= (flags >> 8) & GSM_DCS_CLASS;
+    }
+    if (flags & GSM_FLAG_COMPRESS) *dcs |= GSM_DCS_COMPRESS_IND;
+    if (flags & GSM_FLAG_DELETE) *dcs |= GSM_DCS_DELETE_IND;
+}
+
+int gsm_ts_enc(char *ts, char *pdu, int pdu_size) {
+    uint8_t tz;
+    int tz_hh, tz_mm;
+
+    if (pdu_size < 14) return GSM_ERR;
+
+    pdu[1]  = ts[2];    // YY
+    pdu[0]  = ts[3];
+
+    pdu[3]  = ts[5];    // MM
+    pdu[2]  = ts[6];
+
+    pdu[5]  = ts[8];    // DD
+    pdu[4]  = ts[9];
+
+    pdu[7]  = ts[11];   // hh
+    pdu[6]  = ts[12];
+
+    pdu[9]  = ts[14];   // mm
+    pdu[8]  = ts[15];
+
+    pdu[11] = ts[17];   // ss
+    pdu[10] = ts[18];
+
+    sscanf(ts + 20, "%2d:%2d", &tz_hh, &tz_mm);
+    tz = tz_hh * 4 + tz_mm / 15;
+    tz = (tz / 10) | ((tz % 10) << 4);
+    if (ts[19] == '-') tz |= 0x08;
+
+    pdu_putc(tz, pdu + 12);
+
+    return 14;
+}
+
+int gsm_ts_dec(char *pdu, int pdu_len, char *ts) {
+    uint8_t tz;
+
+    if (pdu_len < 14) return GSM_ERR;
+
+    ts[0]  = '2';
+    ts[1]  = '0';
+    ts[2]  = pdu[1];    // YY
+    ts[3]  = pdu[0];
+    ts[4]  = '-';
+    ts[5]  = pdu[3];    // MM
+    ts[6]  = pdu[2];
+    ts[7]  = '-';
+    ts[8]  = pdu[5];    // DD
+    ts[9]  = pdu[4];
+    ts[10] = 'T';
+    ts[11] = pdu[7];    // hh
+    ts[12] = pdu[6];
+    ts[13] = ':';
+    ts[14] = pdu[9];    // mm
+    ts[15] = pdu[8];
+    ts[16] = ':';
+    ts[17] = pdu[11];   // ss
+    ts[18] = pdu[10];
+
+    tz = pdu_getc(pdu + 12);
+    if (tz & 0x08) {
+        ts[19] = '-';
+        tz = tz & ~0x08;
+    } else {
+        ts[19] = '+';
+    }
+    tz = (tz & 0x0f) * 10 + (tz >> 4);
+    sprintf(ts + 20, "%.2d:%.2d", tz / 4, (tz % 4) * 15);
+
+    return 14;
+}
+
+int gsm_7bit_enc(char *text, int text_len, char *pdu, int padb) {
+    uint8_t carry = 0;
+    int i = 0, pdu_len = 0, shc = 0;
+
+    if (!text_len) return 0;
+
+    if (padb) {
+        shc = 7 - padb;
+    } else {
+        carry = *text;
+        i++;
+    }
+
+    while (i < text_len) {
+        pdu_putc(carry | (*(text + i) << (7 - shc)), pdu + pdu_len);
+        pdu_len += 2;
+
+        shc++;
+        shc = shc % 7;
+        if (!shc) {
+            i++;
+            if (i == text_len) return pdu_len;
+        }
+
+        carry = *(text + i) >> shc;
+        i++;
+    }
+    pdu_putc(carry, pdu + pdu_len);
+    pdu_len += 2;
+
+    return pdu_len;
+}
+
+int gsm_7bit_dec(char *pdu, char *text, int text_len, int padb) {
+    uint8_t ch;
+    uint8_t carry = 0;
+    int i = 0, pdu_len = 0, shc = 0;
+
+    if (!text_len) return 0;
+
+    if (padb) {
+        ch = pdu_getc(pdu);
+        pdu_len += 2;
+        if (padb == 1) {
+            *text = ch >> 1;
+            i++;
+        } else {
+            carry = ch >> padb;
+            shc = 8 - padb;
+        }
+    }
+
+    while (i < text_len) {
+        ch = pdu_getc(pdu + pdu_len);
+        pdu_len += 2;
+
+        *(text + i) = ((ch << shc) | carry) & 0x7f;
+        carry = ch >> (7 - shc);
+        i++;
+
+        shc++;
+        shc = shc % 7;
+        if (!shc && (i < text_len)) {
+            *(text + i) = carry;
+            carry = 0;
+            i++;
+        }
+    }
+
+    return pdu_len;
+}
+
+int gsm_addr_enc(char *addr, int addr_len, uint8_t addr_type, char *pdu, int pdu_size) {
+    int _pdu_len;
+
+    addr_type |= GSM_EXT;
+
+    if ((addr_type & GSM_TON) == GSM_TON_ALPHANUMERIC) {
+        int _addr_len = DIVC(addr_len * 7, 4);
+
+        _pdu_len = 4 + DIVC(_addr_len, 2) * 2;
+        if (pdu_size < _pdu_len) return GSM_ERR;
+
+        pdu_putc(_addr_len, pdu);
+        pdu_putc(addr_type, pdu + 2);
+        gsm_7bit_enc(addr, addr_len, pdu, 0);
+    } else {
+        int i;
+
+        if (addr_type & GSM_TON_INTERNATIONAL) {
+            if (addr[0] != '+') return GSM_ERR;
+            addr++;
+            addr_len--;
+        }
+        _pdu_len = 4 + DIVC(addr_len, 2) * 2;
+        if (pdu_size < _pdu_len) return GSM_ERR;
+
+        pdu_putc(addr_len, pdu);
+        pdu_putc(addr_type, pdu + 2);
+        for (i=0; i<addr_len / 2; i++) {
+            pdu[4 + 2 * i] = addr[2 * i + 1];
+            pdu[4 + 2 * i + 1] = addr[2 * i];
+        }
+        if (addr_len % 2 != 0) {
+            pdu[4 + 2 * i] = 'F';
+            pdu[4 + 2 * i + 1] = addr[2 * i];
+        }
+    }
+
+    return _pdu_len;
+}
+
+int gsm_addr_dec(char *pdu, int pdu_len, char *addr, int addr_size, int *addr_len, uint8_t *addr_type) {
+    int _pdu_len;
+
+    if (pdu_len < 4) return GSM_ERR;
+
+    *addr_len = pdu_getc(pdu);
+    *addr_type = pdu_getc(pdu + 2);
+
+    if (!(*addr_type & GSM_EXT)) return GSM_ERR;
+
+    _pdu_len = 4 + DIVC(*addr_len, 2) * 2;
+    if (pdu_len < _pdu_len) return GSM_ERR;
+
+    if ((*addr_type & GSM_TON) == GSM_TON_ALPHANUMERIC) {
+        *addr_len = (*addr_len * 4) / 7;
+        if (addr_size < *addr_len) return GSM_ERR;
+
+        gsm_7bit_dec(pdu + 4, addr, *addr_len, 0);
+    } else {
+        int i;
+        int _addr_len = *addr_len;
+
+        if (*addr_type & GSM_TON_INTERNATIONAL) {
+            addr[0] = '+';
+            addr++;
+            (*addr_len)++;
+        }
+        if (addr_size < *addr_len) return GSM_ERR;
+
+        for (i=0; i<_addr_len / 2; i++) {
+            addr[2 * i] = pdu[4 + 2 * i + 1];
+            addr[2 * i + 1] = pdu[4 + 2 * i];
+        }
+        if (_addr_len % 2 != 0) {
+            addr[2 * i] = pdu[4 + 2 * i + 1];
+        }
+    }
+
+    return _pdu_len;
+}
+
+int gsm_sms_enc(uint8_t pid, char *addr, int addr_len, uint8_t addr_type, uint8_t *udh, int udh_len, uint8_t *msg, int msg_len, uint8_t enc, uint16_t flags, char *pdu, int pdu_size) {
+    int rv, _pdu_len = 0;
+    uint8_t mti = GSM_MTI_SUBMIT;
+    uint8_t dcs = 0;
+    uint8_t udl;
+
+    if (udh_len) mti |= GSM_UDHI;
+
+    if (pdu_size < 4) return GSM_ERR;
+    pdu_putc(mti, pdu);
+    pdu_putc(00, pdu + 2);
+    _pdu_len += 4;
+
+    rv = gsm_addr_enc(addr, addr_len, addr_type, pdu + _pdu_len, pdu_size - _pdu_len);
+    if (rv < 0) return rv;
+    _pdu_len += rv;
+
+    if (pdu_size < _pdu_len + 4) return GSM_ERR;
+    gsm_dcs_enc(enc, flags, &dcs);
+    pdu_putc(pid, pdu + _pdu_len);
+    pdu_putc(dcs, pdu + _pdu_len + 2);
+    _pdu_len += 4;
+
+    if (enc == GSM_ENC_7BIT) {
+        int udh_blen = 0;
+        int padb = 0;
+
+        if (udh_len) {
+            udh_blen = 8 * (udh_len + 1);
+            padb = DIVC(udh_blen, 7) * 7 - udh_blen;
+        }
+        udl = DIVC(udh_blen, 7) + msg_len;
+
+        if (pdu_size < _pdu_len + (DIVC(udl * 7, 8) + 1) * 2) return GSM_ERR;
+        pdu_putc(udl, pdu + _pdu_len);
+        _pdu_len += 2;
+
+        if (udh_len) {
+            pdu_putc(udh_len, pdu + _pdu_len);
+            pdu_puts(udh, udh_len, pdu + _pdu_len + 2);
+            _pdu_len += (udh_len + 1) * 2;
+        }
+
+        rv = gsm_7bit_enc((char *)msg, msg_len, pdu + _pdu_len, padb);
+        if (rv < 0) return rv;
+        _pdu_len += rv;
+    } else {
+        udl = msg_len + (udh_len ? udh_len + 1 : 0);
+
+        if (pdu_size < _pdu_len + (udl + 1) * 2) return GSM_ERR;
+        pdu_putc(udl, pdu + _pdu_len);
+        _pdu_len += 2;
+
+        if (udh_len) {
+            pdu_putc(udh_len, pdu + _pdu_len);
+            pdu_puts(udh, udh_len, pdu + _pdu_len + 2);
+            _pdu_len += (udh_len + 1) * 2;
+        }
+
+        pdu_puts(msg, msg_len, pdu + _pdu_len);
+        _pdu_len += msg_len * 2;
+    }
+
+    return _pdu_len;
+}
+
+int gsm_sms_dec(char *pdu, int pdu_len, uint8_t *pid, char *addr, int addr_size, int *addr_len, uint8_t *addr_type, uint8_t *udh, int udh_size, int *udh_len, uint8_t *msg, int msg_size, int *msg_len, char *ts, uint8_t *enc, uint16_t *flags) {
+    int rv, _pdu_len = 0;
+    uint8_t mti;
+    uint8_t dcs;
+    uint8_t udl;
+
+    if (pdu_len < 2) return GSM_ERR;
+    mti = pdu_getc(pdu);
+    _pdu_len += 2;
+    if ((mti & GSM_MTI) != GSM_MTI_DELIVER) return GSM_ERR;
+
+    rv = gsm_addr_dec(pdu + _pdu_len, pdu_len - _pdu_len, addr, addr_size, addr_len, addr_type);
+    if (rv < 0) return rv;
+    _pdu_len += rv;
+
+    if (pdu_len < _pdu_len + 4) return GSM_ERR;
+    *pid = pdu_getc(pdu + _pdu_len);
+    dcs = pdu_getc(pdu + _pdu_len + 2);
+    _pdu_len += 4;
+    gsm_dcs_dec(dcs, enc, flags);
+
+    rv = gsm_ts_dec(pdu + _pdu_len, pdu_len - _pdu_len, ts);
+    if (rv < 0) return rv;
+    _pdu_len += rv;
+
+    if (pdu_len < _pdu_len + 2) return GSM_ERR;
+    udl = pdu_getc(pdu + _pdu_len);
+    _pdu_len += 2;
+
+    if ((mti & GSM_UDHI) && (udl == 0)) return GSM_ERR;
+    *udh_len = 0;
+
+    if (*enc == GSM_ENC_7BIT) {
+        int udh_blen = 0;
+        int padb = 0;
+
+        if (pdu_len < _pdu_len + DIVC(udl * 7, 8) * 2) return GSM_ERR;
+
+        if (mti & GSM_UDHI) {
+            *udh_len = pdu_getc(pdu + _pdu_len);
+            udh_blen = 8 * (*udh_len + 1);
+            padb = DIVC(udh_blen, 7) * 7 - udh_blen;
+
+            if (udl * 7 < udh_blen) return GSM_ERR;
+            if (udh_size < *udh_len) return GSM_ERR;
+
+            pdu_gets(pdu + _pdu_len + 2, udh, *udh_len);
+            _pdu_len += (*udh_len + 1) * 2;
+        } else {
+            *udh_len = 0;
+        }
+
+        *msg_len = udl - DIVC(udh_blen, 7);
+        if (msg_size < *msg_len) return GSM_ERR;
+
+        rv = gsm_7bit_dec(pdu + _pdu_len, (char *)msg, *msg_len, padb);
+        if (rv < 0) return rv;
+        _pdu_len += rv;
+    } else {
+        if (pdu_len < _pdu_len + udl * 2) return GSM_ERR;
+
+        if (mti & GSM_UDHI) {
+            *udh_len = pdu_getc(pdu + _pdu_len);
+
+            if (udl < *udh_len + 1) return GSM_ERR;
+            if (udh_size < *udh_len) return GSM_ERR;
+
+            pdu_gets(pdu + _pdu_len + 2, udh, *udh_len);
+            _pdu_len += (*udh_len + 1) * 2;
+        } else {
+            *udh_len = 0;
+        }
+
+        *msg_len = udl - (*udh_len ? *udh_len + 1 : 0);
+        if (msg_size < *msg_len) return GSM_ERR;
+
+        pdu_gets(pdu + _pdu_len, msg, *msg_len);
+        _pdu_len += *msg_len * 2;
+    }
+
+    return _pdu_len;
+}
-- 
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