diff --git a/gatmux/gsm0710.c b/gatmux/gsm0710.c new file mode 100644 index 00000000..d1faa7c2 --- /dev/null +++ b/gatmux/gsm0710.c @@ -0,0 +1,572 @@ +/**************************************************************************** +** +** This file is part of the Qt Extended Opensource Package. +** +** Copyright (C) 2009 Trolltech ASA. +** +** Contact: Qt Extended Information (info@qtextended.org) +** +** This file may be used under the terms of the GNU General Public License +** version 2.0 as published by the Free Software Foundation and appearing +** in the file LICENSE.GPL included in the packaging of this file. +** +** Please review the following information to ensure GNU General Public +** Licensing requirements will be met: +** http://www.fsf.org/licensing/licenses/info/GPLv2.html. +** +** +****************************************************************************/ + +#include "gsm0710_p.h" +#include +#include +#include + +/* Initialize a GSM 07.10 context, in preparation for startup */ +void gsm0710_initialize(struct gsm0710_context *ctx) +{ + ctx->mode = GSM0710_MODE_BASIC; + ctx->frame_size = GSM0710_DEFAULT_FRAME_SIZE; + ctx->port_speed = 115200; + ctx->server = 0; + ctx->buffer_used = 0; + memset(ctx->used_channels, 0, sizeof(ctx->used_channels)); + ctx->reinit_detect = 0; + ctx->reinit_detect_len = 0; + ctx->user_data = 0; + ctx->fd = -1; + ctx->at_command = 0; + ctx->read = 0; + ctx->write = 0; + ctx->deliver_data = 0; + ctx->deliver_status = 0; + ctx->debug_message = 0; + ctx->open_channel = 0; + ctx->close_channel = 0; + ctx->terminate = 0; + ctx->packet_filter = 0; +} + +/* Determine if a channel is in use */ +static int is_channel_used(struct gsm0710_context *ctx, int channel) +{ + int index = channel / 32; + return ((ctx->used_channels[index] & (1L << (channel % 32))) != 0); +} + +/* Mark a channel as used */ +static void mark_channel_used(struct gsm0710_context *ctx, int channel) +{ + int index = channel / 32; + ctx->used_channels[index] |= (1L << (channel % 32)); +} + +/* Mark a channel as unused */ +static void mark_channel_unused(struct gsm0710_context *ctx, int channel) +{ + int index = channel / 32; + ctx->used_channels[index] &= ~(1L << (channel % 32)); +} + +/* Write a debug message */ +static void gsm0710_debug(struct gsm0710_context *ctx, const char *msg) +{ + if (ctx->debug_message) + (*(ctx->debug_message))(ctx, msg); +} + +/* Set the "reinitialize detect" string to "str". When "str" is + encountered in the input stream, the AT+CMUX command will be + re-sent and the multiplexer re-started. This is needed for + devices that drop out of multiplexer mode due to suspend/wakeup/etc. + The data at "str" must persist until the context is destroyed */ +void gsm0710_set_reinit_detect(struct gsm0710_context *ctx, const char *str) +{ + ctx->reinit_detect = str; + ctx->reinit_detect_len = (str ? strlen(str) : 0); +} + +/* Start up the GSM 07.10 session on the underlying device. + If "send_cmux" is non-zero, then send the AT+CMUX command. + Otherwise the underlying device is assumed to already be + in multiplexing mode. Returns zero if the AT+CMUX failed */ +int gsm0710_startup(struct gsm0710_context *ctx, int send_cmux) +{ + int channel; + char command[64]; + + /* Discard any data in the buffer, in case of restart */ + ctx->buffer_used = 0; + + /* Send the appropriate AT+CMUX command */ + if (send_cmux) { + int speed; + switch (ctx->port_speed) { + case 9600: speed = 1; break; + case 19200: speed = 2; break; + case 38400: speed = 3; break; + case 57600: speed = 4; break; + case 115200: speed = 5; break; + case 230400: speed = 6; break; + default: speed = 5; break; + } + sprintf(command, "AT+CMUX=%d,0,%d,%d", + ctx->mode, speed, ctx->frame_size); + if (!ctx->at_command || !(*(ctx->at_command))(ctx, command)) { + gsm0710_debug + (ctx, "could not initialize multiplexing with AT+CMUX"); + return 0; + } + } + + /* Open the control channel */ + gsm0710_write_frame(ctx, 0, GSM0710_OPEN_CHANNEL, 0, 0); + + /* Open previously-used channels if this is a reinit. + Send "ERROR" on re-opened channels, to cause higher + layers to abort pending AT commands */ + for (channel = 1; channel <= GSM0710_MAX_CHANNELS; ++channel) { + if (is_channel_used(ctx, channel)) { + gsm0710_write_frame(ctx, channel, GSM0710_OPEN_CHANNEL, 0, 0); + if (ctx->deliver_data) + (*ctx->deliver_data)(ctx, channel, "\r\nERROR\r\n", 9); + } + } + return 1; +} + +/* Shut down the GSM 07.10 session, closing all channels */ +void gsm0710_shutdown(struct gsm0710_context *ctx) +{ + static const char terminate[2] = + {GSM0710_TERMINATE_BYTE1, GSM0710_TERMINATE_BYTE2}; + if (!ctx->server) { + int channel; + for (channel = 1; channel <= GSM0710_MAX_CHANNELS; ++channel) { + if(is_channel_used(ctx, channel)) { + gsm0710_write_frame(ctx, channel, GSM0710_CLOSE_CHANNEL, 0, 0); + } + } + gsm0710_write_frame(ctx, 0, GSM0710_DATA, terminate, 2); + } + memset(ctx->used_channels, 0, sizeof(ctx->used_channels)); +} + +/* Open a specific channel. Returns non-zero if successful */ +int gsm0710_open_channel(struct gsm0710_context *ctx, int channel) +{ + if (channel <= 0 || channel > GSM0710_MAX_CHANNELS) + return 0; /* Invalid channel number */ + if (is_channel_used(ctx, channel)) + return 1; /* Channel is already open */ + mark_channel_used(ctx, channel); + if (!ctx->server) + gsm0710_write_frame(ctx, channel, GSM0710_OPEN_CHANNEL, 0, 0); + return 1; +} + +/* Close a specific channel */ +void gsm0710_close_channel(struct gsm0710_context *ctx, int channel) +{ + if (channel <= 0 || channel > GSM0710_MAX_CHANNELS) + return; /* Invalid channel number */ + if (!is_channel_used(ctx, channel)) + return; /* Channel is already closed */ + mark_channel_unused(ctx, channel); + if (!ctx->server) + gsm0710_write_frame(ctx, channel, GSM0710_CLOSE_CHANNEL, 0, 0); +} + +/* Determine if a specific channel is open */ +int gsm0710_is_channel_open(struct gsm0710_context *ctx, int channel) +{ + if (channel <= 0 || channel > GSM0710_MAX_CHANNELS) + return 0; /* Invalid channel number */ + return is_channel_used(ctx, channel); +} + +static const unsigned char crc_table[256] = { + 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, + 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B, + 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, + 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67, + 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, + 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43, + 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, + 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F, + 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, + 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B, + 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, + 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17, + 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, + 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33, + 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, + 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F, + 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, + 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B, + 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, + 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87, + 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, + 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3, + 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, + 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF, + 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, + 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB, + 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, + 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7, + 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, + 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3, + 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, + 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF +}; + +int gsm0710_compute_crc(const char *data, int len) +{ + int sum = 0xFF; + while ( len > 0 ) { + sum = crc_table[ ( sum ^ *data++ ) & 0xFF ]; + --len; + } + return (~sum & 0xFF); +} + +/* Process an incoming GSM 07.10 packet */ +static int gsm0710_packet( struct gsm0710_context *ctx, int channel, int type, + const char *data, int len ) +{ + if (ctx->packet_filter && + (*(ctx->packet_filter))(ctx, channel, type, data, len)) { + /* The filter has extracted and processed the packet */ + return 1; + } + if (type == 0xEF || type == 0x03) { + + if (channel >= 1 && channel <= GSM0710_MAX_CHANNELS && + is_channel_used(ctx, channel)) { + /* Ordinary data packet */ + if (ctx->deliver_data) + (*(ctx->deliver_data))(ctx, channel, data, len); + } else if (channel == 0) { + /* An embedded command or response on channel 0 */ + if (len >= 2 && data[0] == (char)GSM0710_STATUS_SET) { + return gsm0710_packet(ctx, channel, GSM0710_STATUS_ACK, + data + 2, len - 2); + } else if (len >= 2 && data[0] == (char)0xC3 && ctx->server) { + /* Incoming terminate request on server side */ + for (channel = 1; channel <= GSM0710_MAX_CHANNELS; ++channel) { + if (is_channel_used(ctx, channel)) { + if (ctx->close_channel) + (*(ctx->close_channel))(ctx, channel); + } + } + memset(ctx->used_channels, 0, sizeof(ctx->used_channels)); + if (ctx->terminate) + (*(ctx->terminate))(ctx); + return 0; + } else if (len >= 2 && data[0] == (char)0x43) { + /* Test command from other side - send the same bytes back */ + char *resp = (char *)alloca(len); + memcpy(resp, data, len); + resp[0] = (char)0x41; /* Clear the C/R bit in the response */ + gsm0710_write_frame(ctx, 0, GSM0710_DATA, resp, len); + } + } + + } else if (type == GSM0710_STATUS_ACK && channel == 0) { + + /* Status change message */ + if (len >= 2) { + /* Handle status changes on other channels */ + channel = ((data[0] & 0xFC) >> 2); + if (channel >= 1 && channel <= GSM0710_MAX_CHANNELS && + is_channel_used(ctx, channel)) { + if (ctx->deliver_status) + (*(ctx->deliver_status))(ctx, channel, data[1] & 0xFF); + } + } + + /* Send the response to the status change request to ACK it */ + gsm0710_debug(ctx, "received status line signal, sending response"); + char resp[33]; + if ( len > 31 ) + len = 31; + resp[0] = (char)GSM0710_STATUS_ACK; + resp[1] = (char)((len << 1) | 0x01); + memcpy(resp + 2, data, len); + gsm0710_write_frame(ctx, 0, GSM0710_DATA, resp, len + 2); + + } else if (type == (0x3F & 0xEF) && ctx->server) { + + /* Incoming channel open request on server side */ + if (channel >= 1 && channel <= GSM0710_MAX_CHANNELS) { + if (!is_channel_used(ctx, channel)) { + mark_channel_used(ctx, channel); + if (ctx->open_channel) + (*(ctx->open_channel))(ctx, channel); + } + } + + } else if (type == (0x53 & 0xEF) && ctx->server) { + + /* Incoming channel close request on server side */ + if (channel >= 1 && channel <= GSM0710_MAX_CHANNELS) { + if (is_channel_used(ctx, channel)) { + mark_channel_unused(ctx, channel); + if (ctx->close_channel) + (*(ctx->close_channel))(ctx, channel); + } + } + + } + return 1; +} + +/* Function that is called when the underlying device is ready to be read. + A callback will be made to ctx->read to get the data for processing */ +void gsm0710_ready_read(struct gsm0710_context *ctx) +{ + /* Read more data from the underlying serial device */ + if (!ctx->read) + return; + int len = (*(ctx->read))(ctx, ctx->buffer + ctx->buffer_used, + sizeof(ctx->buffer) - ctx->buffer_used); + if ( len <= 0 ) + return; + + /* Update the buffer size */ + ctx->buffer_used += len; + + /* Check for the re-initialization detection string */ + if (!ctx->server && ctx->reinit_detect_len && + len >= ctx->reinit_detect_len && + !memcmp(ctx->buffer, ctx->reinit_detect, ctx->reinit_detect_len)) { + gsm0710_startup(ctx, 1); + return; + } + + /* Break the incoming data up into packets */ + int posn = 0; + int posn2; + int header_size; + int channel, type; + while (posn < ctx->buffer_used) { + if (ctx->buffer[posn] == (char)0xF9) { + + /* Basic format: skip additional 0xF9 bytes between frames */ + while ((posn + 1) < ctx->buffer_used && + ctx->buffer[posn + 1] == (char)0xF9) { + ++posn; + } + + /* We need at least 4 bytes for the header */ + if ((posn + 4) > ctx->buffer_used) + break; + + /* The low bit of the second byte should be 1, + which indicates a short channel number */ + if ((ctx->buffer[posn + 1] & 0x01 ) == 0) { + ++posn; + continue; + } + + /* Get the packet length and validate it */ + len = (ctx->buffer[posn + 3] >> 1) & 0x7F; + if ((ctx->buffer[posn + 3] & 0x01) != 0) { + /* Single-byte length indication */ + header_size = 3; + } else { + /* Double-byte length indication */ + if ((posn + 5) > ctx->buffer_used) + break; + len |= ((int)(unsigned char)(ctx->buffer[posn + 4])) << 7; + header_size = 4; + } + if ((posn + header_size + 2 + len) > ctx->buffer_used ) + break; + + /* Verify the packet header checksum */ + if (((gsm0710_compute_crc(ctx->buffer + posn + 1, header_size) ^ + ctx->buffer[posn + len + header_size + 1]) & 0xFF) + != 0) { + gsm0710_debug(ctx, "*** GSM 07.10 checksum check failed ***"); + posn += len + header_size + 2; + continue; + } + + /* Get the channel number and packet type from the header */ + channel = (ctx->buffer[posn + 1] >> 2) & 0x3F; + type = ctx->buffer[posn + 2] & 0xEF; /* Strip "PF" bit */ + + /* Dispatch data packets to the appropriate channel */ + if (!gsm0710_packet(ctx, channel, type, + ctx->buffer + posn + header_size + 1, len)) { + /* Session has been terminated */ + ctx->buffer_used = 0; + return; + } + posn += len + header_size + 2; + + } else if (ctx->buffer[posn] == (char)0x7E) { + + /* Advanced format: skip additional 0x7E bytes between frames */ + while ((posn + 1) < ctx->buffer_used && + ctx->buffer[posn + 1] == (char)0x7E) { + ++posn; + } + + /* Search for the end of the packet (the next 0x7E byte) */ + len = posn + 1; + while (len < ctx->buffer_used && + ctx->buffer[len] != (char)0x7E) { + ++len; + } + if (len >= ctx->buffer_used) { + /* There are insufficient bytes for a packet at present */ + if ( posn == 0 && len >= (int)sizeof( ctx->buffer ) ) { + /* The buffer is full and we were unable to find a + legitimate packet. Discard the buffer and restart */ + posn = len; + } + break; + } + + /* Undo control byte quoting in the packet */ + posn2 = 0; + ++posn; + while (posn < len) { + if (ctx->buffer[posn] == 0x7D) { + ++posn; + if ( posn >= len) + break; + ctx->buffer[posn2++] = (char)(ctx->buffer[posn++] ^ 0x20); + } else { + ctx->buffer[posn2++] = ctx->buffer[posn++]; + } + } + + /* Validate the checksum on the packet header */ + if (posn2 >= 3) { + if (((gsm0710_compute_crc(ctx->buffer, 2) ^ + ctx->buffer[posn2 - 1]) & 0xFF) != 0 ) { + gsm0710_debug(ctx, "*** GSM 07.10 advanced checksum " + "check failed ***"); + continue; + } + } else { + gsm0710_debug(ctx, "*** GSM 07.10 advanced packet " + "is too small ***"); + continue; + } + + /* Decode and dispatch the packet */ + channel = (ctx->buffer[0] >> 2) & 0x3F; + type = ctx->buffer[1] & 0xEF; /* Strip "PF" bit */ + if (!gsm0710_packet(ctx, channel, type, + ctx->buffer + 2, posn2 - 3)) { + /* Session has been terminated */ + ctx->buffer_used = 0; + return; + } + + } else { + ++posn; + } + } + if ( posn < ctx->buffer_used ) { + memmove( ctx->buffer, ctx->buffer + posn, ctx->buffer_used - posn ); + ctx->buffer_used -= posn; + } else { + ctx->buffer_used = 0; + } +} + +/* Write a raw GSM 07.10 frame to the underlying device */ +void gsm0710_write_frame(struct gsm0710_context *ctx, int channel, int type, + const char *data, int len) +{ + char *frame = (char *)alloca(ctx->frame_size * 2 + 8); + int size; + if (len > ctx->frame_size) + len = ctx->frame_size; + if (ctx->mode) { + int temp, crc; + frame[0] = (char)0x7E; + frame[1] = (char)((channel << 2) | 0x03); + frame[2] = (char)type; + crc = gsm0710_compute_crc(frame + 1, 2); + if ( type == 0x7E || type == 0x7D ) { + /* Need to quote the type field now that crc has been computed */ + frame[2] = (char)0x7D; + frame[3] = (char)(type ^ 0x20); + size = 4; + } else { + size = 3; + } + while ( len > 0 ) { + temp = *data++ & 0xFF; + --len; + if ( temp != 0x7E && temp != 0x7D ) { + frame[size++] = (char)temp; + } else { + frame[size++] = (char)0x7D; + frame[size++] = (char)(temp ^ 0x20); + } + } + if ( crc != 0x7E && crc != 0x7D ) { + frame[size++] = (char)crc; + } else { + frame[size++] = (char)0x7D; + frame[size++] = (char)(crc ^ 0x20); + } + frame[size++] = (char)0x7E; + } else { + int header_size; + frame[0] = (char)0xF9; + frame[1] = (char)((channel << 2) | 0x03); + frame[2] = (char)type; + if (len <= 127) { + frame[3] = (char)((len << 1) | 0x01); + header_size = size = 4; + } else { + frame[3] = (char)(len << 1); + frame[4] = (char)(len >> 7); + header_size = size = 5; + } + if (len > 0) { + memcpy(frame + size, data, len); + size += len; + } + /* Note: GSM 07.10 says that the CRC is only computed over the header */ + frame[size++] = (char)gsm0710_compute_crc(frame + 1, header_size - 1); + frame[size++] = (char)0xF9; + } + if (ctx->write) + (*(ctx->write))(ctx, frame, size); +} + +/* Write a block of data to the the underlying device. It will be split + into several frames according to the frame size, if necessary */ +void gsm0710_write_data(struct gsm0710_context *ctx, int channel, + const void *data, int len) +{ + int temp; + while (len > 0) { + temp = len; + if (temp > ctx->frame_size) + temp = ctx->frame_size; + gsm0710_write_frame(ctx, channel, GSM0710_DATA, data, temp); + data = (const void *)(((const char *)data) + temp); + len -= temp; + } +} + +/* Set the modem status lines on a channel */ +void gsm0710_set_status(struct gsm0710_context *ctx, int channel, int status) +{ + char data[4]; + data[0] = (char)GSM0710_STATUS_SET; + data[1] = (char)0x03; + data[2] = (char)((channel << 2) | 0x03); + data[3] = (char)status; + gsm0710_write_frame(ctx, 0, GSM0710_DATA, data, 4); +} diff --git a/gatmux/gsm0710_p.h b/gatmux/gsm0710_p.h new file mode 100644 index 00000000..3807d72e --- /dev/null +++ b/gatmux/gsm0710_p.h @@ -0,0 +1,113 @@ +/**************************************************************************** +** +** This file is part of the Qt Extended Opensource Package. +** +** Copyright (C) 2009 Trolltech ASA. +** +** Contact: Qt Extended Information (info@qtextended.org) +** +** This file may be used under the terms of the GNU General Public License +** version 2.0 as published by the Free Software Foundation and appearing +** in the file LICENSE.GPL included in the packaging of this file. +** +** Please review the following information to ensure GNU General Public +** Licensing requirements will be met: +** http://www.fsf.org/licensing/licenses/info/GPLv2.html. +** +** +****************************************************************************/ + +#ifndef GSM0710_P_H +#define GSM0710_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt Extended API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#ifdef __cplusplus +extern "C" { +#endif + +#define GSM0710_BUFFER_SIZE 4096 +#define GSM0710_DEFAULT_FRAME_SIZE 31 +#define GSM0710_MAX_CHANNELS 63 + +#define GSM0710_MODE_BASIC 0 +#define GSM0710_MODE_ADVANCED 1 + +/* Frame types and subtypes */ +#define GSM0710_OPEN_CHANNEL 0x3F +#define GSM0710_CLOSE_CHANNEL 0x53 +#define GSM0710_DATA 0xEF +#define GSM0710_DATA_ALT 0x03 +#define GSM0710_STATUS_SET 0xE3 +#define GSM0710_STATUS_ACK 0xE1 +#define GSM0710_TERMINATE_BYTE1 0xC3 +#define GSM0710_TERMINATE_BYTE2 0x01 + +/* Status flags */ +#define GSM0710_FC 0x02 +#define GSM0710_DTR 0x04 +#define GSM0710_DSR 0x04 +#define GSM0710_RTS 0x08 +#define GSM0710_CTS 0x08 +#define GSM0710_DCD 0x80 + +struct gsm0710_context +{ + /* GSM 07.10 implementation details */ + int mode; + int frame_size; + int port_speed; + int server; + char buffer[GSM0710_BUFFER_SIZE]; + int buffer_used; + unsigned long used_channels[(GSM0710_MAX_CHANNELS + 31) / 32]; + const char *reinit_detect; + int reinit_detect_len; + + /* Hooks to other levels */ + void *user_data; + int fd; + int (*at_command)(struct gsm0710_context *ctx, const char *cmd); + int (*read)(struct gsm0710_context *ctx, void *data, int len); + int (*write)(struct gsm0710_context *ctx, const void *data, int len); + void (*deliver_data)(struct gsm0710_context *ctx, int channel, + const void *data, int len); + void (*deliver_status)(struct gsm0710_context *ctx, + int channel, int status); + void (*debug_message)(struct gsm0710_context *ctx, const char *msg); + void (*open_channel)(struct gsm0710_context *ctx, int channel); + void (*close_channel)(struct gsm0710_context *ctx, int channel); + void (*terminate)(struct gsm0710_context *ctx); + int (*packet_filter)(struct gsm0710_context *ctx, int channel, + int type, const char *data, int len); +}; + +void gsm0710_initialize(struct gsm0710_context *ctx); +void gsm0710_set_reinit_detect(struct gsm0710_context *ctx, const char *str); +int gsm0710_startup(struct gsm0710_context *ctx, int send_cmux); +void gsm0710_shutdown(struct gsm0710_context *ctx); +int gsm0710_open_channel(struct gsm0710_context *ctx, int channel); +void gsm0710_close_channel(struct gsm0710_context *ctx, int channel); +int gsm0710_is_channel_open(struct gsm0710_context *ctx, int channel); +void gsm0710_ready_read(struct gsm0710_context *ctx); +void gsm0710_write_frame(struct gsm0710_context *ctx, int channel, int type, + const char *data, int len); +void gsm0710_write_data(struct gsm0710_context *ctx, int channel, + const void *data, int len); +void gsm0710_set_status(struct gsm0710_context *ctx, int channel, int status); +int gsm0710_compute_crc(const char *data, int len); + +#ifdef __cplusplus +}; +#endif + +#endif