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#define STREAM_BUFFER_SIZE 2048
#define STREAMTYPE_FILE 0
#define STREAMTYPE_VCD 1
#define STREAMTYPE_STREAM 2 // same as FILE but no seeking (for stdin)
#define VCD_SECTOR_SIZE 2352
#define VCD_SECTOR_OFFS 24
#define VCD_SECTOR_DATA 2324
int vcd_seek_to_track(int fd,int track);
void vcd_read_toc(int fd);
#ifdef VCD_CACHE
void vcd_cache_init(int s);
#endif
typedef struct {
int fd;
long pos;
int eof;
int type; // 0=file 1=VCD
unsigned int buf_pos,buf_len;
long start_pos,end_pos;
unsigned char buffer[STREAM_BUFFER_SIZE>VCD_SECTOR_SIZE?STREAM_BUFFER_SIZE:VCD_SECTOR_SIZE];
} stream_t;
int stream_fill_buffer(stream_t *s);
int stream_seek_long(stream_t *s,unsigned int pos);
inline static int stream_read_char(stream_t *s){
return (s->buf_pos<s->buf_len)?s->buffer[s->buf_pos++]:
(stream_fill_buffer(s)?s->buffer[s->buf_pos++]:-256);
// if(s->buf_pos<s->buf_len) return s->buffer[s->buf_pos++];
// stream_fill_buffer(s);
// if(s->buf_pos<s->buf_len) return s->buffer[s->buf_pos++];
// return 0; // EOF
}
inline static unsigned int stream_read_word(stream_t *s){
int x,y;
x=stream_read_char(s);
y=stream_read_char(s);
return (x<<8)|y;
}
inline static unsigned int stream_read_dword(stream_t *s){
unsigned int y;
y=stream_read_char(s);
y=(y<<8)|stream_read_char(s);
y=(y<<8)|stream_read_char(s);
y=(y<<8)|stream_read_char(s);
return y;
}
inline static unsigned int stream_read_word_le(stream_t *s){
int x,y;
x=stream_read_char(s);
y=stream_read_char(s);
return (y<<8)|x;
}
inline static unsigned int stream_read_dword_le(stream_t *s){
unsigned int y;
y=stream_read_char(s);
y|=stream_read_char(s)<<8;
y|=stream_read_char(s)<<16;
y|=stream_read_char(s)<<24;
return y;
}
inline static void stream_read(stream_t *s,char* mem,int len){
while(len>0){
int x;
x=s->buf_len-s->buf_pos;
if(x==0){
if(!stream_fill_buffer(s)) return; // EOF
x=s->buf_len-s->buf_pos;
}
if(s->buf_pos>s->buf_len) printf("stream_read: WARNING! s->buf_pos>s->buf_len\n");
if(x>len) x=len;
memcpy(mem,&s->buffer[s->buf_pos],x);
s->buf_pos+=x; mem+=x; len-=x;
}
}
inline static int stream_eof(stream_t *s){
return s->eof;
}
inline static int stream_tell(stream_t *s){
return s->pos+s->buf_pos-s->buf_len;
}
inline static int stream_seek(stream_t *s,unsigned int pos){
// if(verbose>=3) printf("seek to 0x%X\n",pos);
if(pos<s->pos){
int x=pos-(s->pos-s->buf_len);
if(x>=0){
s->buf_pos=x;
// putchar('*');fflush(stdout);
return 1;
}
}
return stream_seek_long(s,pos);
}
inline static void stream_skip(stream_t *s,int len){
if(len<0 || (len>2*STREAM_BUFFER_SIZE && s->type!=STREAMTYPE_STREAM)){
// negative or big skip!
stream_seek(s,stream_tell(s)+len);
return;
}
while(len>0){
int x=s->buf_len-s->buf_pos;
if(x==0){
if(!stream_fill_buffer(s)) return; // EOF
x=s->buf_len-s->buf_pos;
}
if(x>len) x=len;
//memcpy(mem,&s->buf[s->buf_pos],x);
s->buf_pos+=x; len-=x;
}
}
void stream_reset(stream_t *s);
stream_t* new_stream(int fd,int type);
void free_stream(stream_t *s);
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