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#ifdef _WIN32
#include <Winsock2.h>
#else
#include <netinet/in.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "format.h"
struct red_reob {
unsigned long len;
char head[4];
unsigned long rdvo;
unsigned long rdvs;
unsigned long rdao;
unsigned long rdas;
unsigned long unknown1;
unsigned long unknown2;
unsigned long totlen;
unsigned long avgv;
unsigned long avgs;
unsigned long unknown3;
unsigned long unknown4;
unsigned long unknown5;
};
struct redcode_handle {
FILE * fp;
struct red_reob * reob;
unsigned long * rdvo;
unsigned long * rdvs;
unsigned long * rdao;
unsigned long * rdas;
long cfra;
};
static unsigned char* read_packet(FILE * fp, char * expect)
{
unsigned long len;
char head[5];
unsigned char * rv;
fread(&len, 4, 1, fp);
fread(&head, 4, 1, fp);
head[4] = 0;
len = ntohl(len);
if (strcmp(expect, head) != 0) {
fprintf(stderr, "Read: %s, expect: %s\n", head, expect);
return NULL;
}
rv = (unsigned char*) malloc(len + 8);
memcpy(rv, &len, 4);
memcpy(rv + 4, &head, 4);
fread(rv + 8, len, 1, fp);
return rv;
}
static unsigned long * read_index_packet(FILE * fp, char * expect)
{
unsigned long * rv = (unsigned long*) read_packet(fp, expect);
int i;
if (!rv) {
return NULL;
}
for (i = 2; i < rv[0]/4; i++) {
rv[i] = ntohl(rv[i]);
}
return rv;
}
static struct red_reob * read_reob(FILE * fp)
{
fseek(fp, -0x38, SEEK_END);
return (struct red_reob *) read_index_packet(fp, "REOB");
}
static unsigned long * read_index(FILE * fp, unsigned long i, char * expect)
{
fseek(fp, i, SEEK_SET);
return (unsigned long*) read_index_packet(fp, expect);
}
static unsigned char * read_data(FILE * fp, unsigned long i, char * expect)
{
fseek(fp, i, SEEK_SET);
return read_packet(fp, expect);
}
struct redcode_handle * redcode_open(const char * fname)
{
struct redcode_handle * rv = NULL;
struct red_reob * reob = NULL;
FILE * fp = fopen(fname, "rb");
if (!fp) {
return NULL;
}
reob = read_reob(fp);
if (!reob) {
fclose(fp);
return NULL;
}
rv = (struct redcode_handle*) calloc(1, sizeof(struct redcode_handle));
rv->fp = fp;
rv->reob = reob;
rv->rdvo = read_index(fp, reob->rdvo, "RDVO");
rv->rdvs = read_index(fp, reob->rdvs, "RDVS");
rv->rdao = read_index(fp, reob->rdao, "RDAO");
rv->rdas = read_index(fp, reob->rdas, "RDAS");
if (!rv->rdvo || !rv->rdvs || !rv->rdao || !rv->rdas) {
redcode_close(rv);
return NULL;
}
return rv;
}
void redcode_close(struct redcode_handle * handle)
{
if (handle->reob) {
free(handle->reob);
}
if (handle->rdvo) {
free(handle->rdvo);
}
if (handle->rdvs) {
free(handle->rdvs);
}
if (handle->rdao) {
free(handle->rdao);
}
if (handle->rdas) {
free(handle->rdas);
}
fclose(handle->fp);
free(handle);
}
long redcode_get_length(struct redcode_handle * handle)
{
return handle->rdvo[0]/4;
}
struct redcode_frame * redcode_read_video_frame(
struct redcode_handle * handle, long frame)
{
struct redcode_frame * rv;
unsigned char * data;
if (frame > handle->rdvo[0]/4 || handle->rdvo[frame + 2] == 0) {
return NULL;
}
data = read_data(handle->fp, handle->rdvo[frame + 2], "REDV");
if (!data) {
return NULL;
}
rv = (struct redcode_frame*) calloc(1, sizeof(struct redcode_frame));
rv->offset = 12+8;
rv->length = *(unsigned long*)data - rv->offset;
rv->data = data;
return rv;
}
struct redcode_frame * redcode_read_audio_frame(
struct redcode_handle * handle, long frame)
{
struct redcode_frame * rv;
unsigned char * data;
if (frame > handle->rdao[0]/4 || handle->rdao[frame + 2] == 0) {
return NULL;
}
data = read_data(handle->fp, handle->rdao[frame+2], "REDA");
if (!data) {
return NULL;
}
rv = (struct redcode_frame*) calloc(1, sizeof(struct redcode_frame));
rv->offset = 24+8;
rv->length = *(unsigned long*)data - rv->offset;
rv->data = data;
return rv;
}
void redcode_free_frame(struct redcode_frame * frame)
{
free(frame->data);
free(frame);
}
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