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94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
#include "device_msg.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util/binary.h"
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#include "util/log.h"
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ssize_t
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sc_device_msg_deserialize(const uint8_t *buf, size_t len,
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struct sc_device_msg *msg) {
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if (!len) {
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return 0; // no message
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}
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msg->type = buf[0];
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switch (msg->type) {
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case DEVICE_MSG_TYPE_CLIPBOARD: {
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if (len < 5) {
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// at least type + empty string length
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return 0; // no complete message
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}
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size_t clipboard_len = sc_read32be(&buf[1]);
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if (clipboard_len > len - 5) {
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return 0; // no complete message
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}
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char *text = malloc(clipboard_len + 1);
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if (!text) {
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LOG_OOM();
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return -1;
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}
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if (clipboard_len) {
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memcpy(text, &buf[5], clipboard_len);
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}
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text[clipboard_len] = '\0';
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msg->clipboard.text = text;
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return 5 + clipboard_len;
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}
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case DEVICE_MSG_TYPE_ACK_CLIPBOARD: {
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if (len < 9) {
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return 0; // no complete message
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}
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uint64_t sequence = sc_read64be(&buf[1]);
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msg->ack_clipboard.sequence = sequence;
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return 9;
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}
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case DEVICE_MSG_TYPE_UHID_OUTPUT: {
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if (len < 5) {
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// at least id + size
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return 0; // not available
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}
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uint16_t id = sc_read16be(&buf[1]);
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size_t size = sc_read16be(&buf[3]);
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if (size < len - 5) {
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return 0; // not available
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}
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uint8_t *data = malloc(size);
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if (!data) {
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LOG_OOM();
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return -1;
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}
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if (size) {
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memcpy(data, &buf[5], size);
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}
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msg->uhid_output.id = id;
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msg->uhid_output.size = size;
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msg->uhid_output.data = data;
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return 5 + size;
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}
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default:
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LOGW("Unknown device message type: %d", (int) msg->type);
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return -1; // error, we cannot recover
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}
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}
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void
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sc_device_msg_destroy(struct sc_device_msg *msg) {
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switch (msg->type) {
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case DEVICE_MSG_TYPE_CLIPBOARD:
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free(msg->clipboard.text);
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break;
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case DEVICE_MSG_TYPE_UHID_OUTPUT:
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free(msg->uhid_output.data);
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break;
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default:
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// nothing to do
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break;
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}
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}
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