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// -*- c-basic-offset: 4 -*-
/*
dssi-vst: a DSSI plugin wrapper for VST effects and instruments
Copyright 2004-2008 Chris Cannam
*/
#include "rdwrops.h"
#include <errno.h>
#include <unistd.h>
//#define DEBUG_RDWR 1
extern void
rdwr_tryRead(int fd, void *buf, size_t count, const char *file, int line)
{
ssize_t r = 0;
while ((r = read(fd, buf, count)) < (ssize_t)count) {
if (r == 0) {
// end of file
throw RemotePluginClosedException();
} else if (r < 0) {
if (errno != EAGAIN) {
char message[100];
sprintf(message, "Read failed on fd %d at %s:%d", fd, file, line);
perror(message);
throw RemotePluginClosedException();
}
r = 0;
}
buf = (void *)(((char *)buf) + r);
count -= r;
if (count > 0) {
usleep(20000);
}
}
#ifdef DEBUG_RDWR
if (r >= count) {
fprintf(stderr, "read succeeded at %s:%d (%d bytes)\n",
file, line, r);
}
#endif
}
extern void
rdwr_tryWrite(int fd, const void *buf, size_t count, const char *file, int line)
{
ssize_t w = write(fd, buf, count);
if (w < 0) {
char message[100];
sprintf(message, "Write failed on fd %d at %s:%d", fd, file, line);
perror(message);
throw RemotePluginClosedException();
}
if (w < (ssize_t)count) {
fprintf(stderr, "Failed to complete write on fd %d (have %d, put %d) at %s:%d\n",
fd, (int)count, (int)w, file, line);
throw RemotePluginClosedException();
}
#ifdef DEBUG_RDWR
fprintf(stderr, "write succeeded at %s:%d (%d bytes)\n",
file, line, w);
#endif
}
extern void
rdwr_writeOpcode(int fd, RemotePluginOpcode opcode, const char *file, int line)
{
rdwr_tryWrite(fd, &opcode, sizeof(RemotePluginOpcode), file, line);
}
extern void
rdwr_writeString(int fd, const std::string &str, const char *file, int line)
{
int len = str.length();
rdwr_tryWrite(fd, &len, sizeof(int), file, line);
rdwr_tryWrite(fd, str.c_str(), len, file, line);
}
extern std::string
rdwr_readString(int fd, const char *file, int line)
{
int len;
static char *buf = 0;
static int bufLen = 0;
rdwr_tryRead(fd, &len, sizeof(int), file, line);
if (len + 1 > bufLen) {
delete buf;
buf = new char[len + 1];
bufLen = len + 1;
}
rdwr_tryRead(fd, buf, len, file, line);
buf[len] = '\0';
return std::string(buf);
}
extern void
rdwr_writeInt(int fd, int i, const char *file, int line)
{
rdwr_tryWrite(fd, &i, sizeof(int), file, line);
}
extern int
rdwr_readInt(int fd, const char *file, int line)
{
int i = 0;
rdwr_tryRead(fd, &i, sizeof(int), file, line);
return i;
}
extern void
rdwr_writeFloat(int fd, float f, const char *file, int line)
{
rdwr_tryWrite(fd, &f, sizeof(float), file, line);
}
extern float
rdwr_readFloat(int fd, const char *file, int line)
{
float f = 0;
rdwr_tryRead(fd, &f, sizeof(float), file, line);
return f;
}
extern unsigned char *
rdwr_readMIDIData(int fd, int **frameoffsets, int &events, const char *file, int line)
{
static unsigned char *buf = 0;
static int *frameoffbuf = 0;
static int bufEvts = 0;
rdwr_tryRead(fd, &events, sizeof(int), file, line);
if (events > bufEvts) {
delete buf;
delete frameoffbuf;
buf = new unsigned char[events * 3];
frameoffbuf = new int[events];
bufEvts = events;
}
rdwr_tryRead(fd, buf, events * 3, file, line);
rdwr_tryRead(fd, frameoffbuf, events * sizeof(int), file, line);
if (frameoffsets) *frameoffsets = frameoffbuf;
return buf;
}
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