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csp_sfp.c
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csp_sfp.c
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#include <csp/csp_sfp.h>
#include <stdlib.h>
#include <csp/csp_buffer.h>
#include <csp/csp_debug.h>
#include "csp_macro.h"
#include <endian.h>
#include "csp_conn.h"
typedef struct __packed {
uint32_t offset;
uint32_t totalsize;
} sfp_header_t;
/**
* SFP Headers:
* The following functions are helper functions that handles the extra SFP
* information that needs to be appended to all data packets.
*/
static inline sfp_header_t * csp_sfp_header_add(csp_packet_t * packet) {
sfp_header_t * header = (sfp_header_t *)&packet->data[packet->length];
packet->length += sizeof(*header);
return header;
}
static inline sfp_header_t * csp_sfp_header_remove(csp_packet_t * packet) {
if ((packet->id.flags & CSP_FFRAG) == 0) {
return NULL;
}
sfp_header_t * header;
if (packet->length < sizeof(*header)) {
return NULL;
}
header = (sfp_header_t *)&packet->data[packet->length - sizeof(*header)];
packet->length -= sizeof(*header);
header->offset = be32toh(header->offset);
header->totalsize = be32toh(header->totalsize);
if (header->offset > header->totalsize) {
return NULL;
}
return header;
}
int csp_sfp_send_own_memcpy(csp_conn_t * conn, const void * data, unsigned int totalsize, unsigned int mtu, uint32_t timeout, csp_memcpy_fnc_t memcpyfcn) {
if (mtu == 0) {
return CSP_ERR_INVAL;
}
unsigned int count = 0;
while (count < totalsize) {
sfp_header_t * sfp_header;
/* Allocate packet */
csp_packet_t * packet = csp_buffer_get(mtu + sizeof(*sfp_header));
if (packet == NULL) {
return CSP_ERR_NOMEM;
}
/* Calculate sending size */
unsigned int size = totalsize - count;
if (size > mtu) {
size = mtu;
}
/* Print debug */
//csp_print("%s: %d:%d, sending at %p size %u\n", __func__, csp_conn_src(conn), csp_conn_sport(conn), (void *)((uint8_t *)data + count), size);
/* Copy data */
(memcpyfcn)((csp_memptr_t)(uintptr_t)packet->data, (csp_memptr_t)(uintptr_t)(((uint8_t *)data) + count), size);
packet->length = size;
/* Set fragment flag */
conn->idout.flags |= CSP_FFRAG;
/* Add SFP header */
sfp_header = csp_sfp_header_add(packet); // no check, because buffer was allocated with extra size.
sfp_header->totalsize = htobe32(totalsize);
sfp_header->offset = htobe32(count);
/* Send data */
csp_send(conn, packet);
/* Increment count */
count += size;
}
return CSP_ERR_NONE;
}
int csp_sfp_recv_fp(csp_conn_t * conn, void ** return_data, int * return_datasize, uint32_t timeout, csp_packet_t * first_packet) {
*return_data = NULL; /* Allow caller to assume csp_free() can always be called when dataout is non-NULL */
*return_datasize = 0;
/* Get first packet from user, or from connection */
csp_packet_t * packet;
if (first_packet == NULL) {
packet = csp_read(conn, timeout);
if (packet == NULL) {
return CSP_ERR_TIMEDOUT;
}
} else {
packet = first_packet;
}
uint8_t * data = NULL;
uint32_t datasize = 0;
uint32_t data_offset = 0;
int error = CSP_ERR_TIMEDOUT;
do {
/* Read SFP header */
sfp_header_t * sfp_header = csp_sfp_header_remove(packet);
if (sfp_header == NULL) {
//csp_print("%s: %u:%u, invalid message, id.flags: 0x%x, length: %u\n", __func__, packet->id.src, packet->id.sport, packet->id.flags, packet->length);
csp_buffer_free(packet);
error = CSP_ERR_SFP;
goto error;
}
//csp_print("%s: %u:%u, fragment %" PRIu32 "/%" PRIu32 "\n", __func__, packet->id.src, packet->id.sport, sfp_header->offset + packet->length, sfp_header->totalsize);
/* Consistency check */
if (sfp_header->offset != data_offset) {
//csp_print("%s: %u:%u, invalid message, offset %" PRIu32 " (expected %" PRIu32 "), length: %u, totalsize %" PRIu32 "\n", __func__, packet->id.src, packet->id.sport, sfp_header->offset, data_offset, packet->length, sfp_header->totalsize);
csp_buffer_free(packet);
error = CSP_ERR_SFP;
goto error;
}
/* Allocate memory */
if (data == NULL) {
datasize = sfp_header->totalsize;
data = malloc(datasize);
if (data == NULL) {
//csp_print("%s: %u:%u, malloc(%" PRIu32 ") failed\n", __func__, packet->id.src, packet->id.sport, datasize);
csp_buffer_free(packet);
error = CSP_ERR_NOMEM;
goto error;
}
}
/* Consistency check */
if (((data_offset + packet->length) > datasize) || (datasize != sfp_header->totalsize)) {
//csp_print("%s: %u:%u, invalid size, sfp.offset: %" PRIu32 ", length: %u, total: %" PRIu32 " / %" PRIu32 "\n", __func__, packet->id.src, packet->id.sport, sfp_header->offset, packet->length, datasize, sfp_header->totalsize);
csp_buffer_free(packet);
error = CSP_ERR_SFP;
goto error;
}
/* Copy data to output */
memcpy(data + data_offset, packet->data, packet->length);
data_offset += packet->length;
if (data_offset >= datasize) {
// transfer complete
csp_buffer_free(packet);
*return_data = data; // must be freed by csp_free()
*return_datasize = datasize;
return CSP_ERR_NONE;
}
/* Consistency check */
if (packet->length == 0) {
//csp_print("%s: %u:%u, invalid size, sfp.offset: %" PRIu32 ", length: %u, total: %" PRIu32 " / %" PRIu32 "\n", __func__, packet->id.src, packet->id.sport, sfp_header->offset, packet->length, datasize, sfp_header->totalsize);
csp_buffer_free(packet);
error = CSP_ERR_SFP;
goto error;
}
csp_buffer_free(packet);
} while ((packet = csp_read(conn, timeout)) != NULL);
error:
free(data);
return error;
}