From 0cdc7b50b0e7758a1660c94be664a810504a88f4 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 17 Sep 2009 10:08:44 +0000
Subject: [PATCH] Packetize the command stream for more robustness Deal with
 NULL data pointers Rewrite gldump to use mmap to avoid hassle with large
 packets Fix some style issues

---
 Makefile           |  2 +-
 genwrap.py         | 16 +++++------
 source/gldecoder.c | 54 +++++++++++++++++++++++++++----------
 source/gldecoder.h |  2 +-
 source/gldump.c    | 57 +++++++++++++++++++++++----------------
 source/glwrap.c    | 67 ++++++++++++++++++++++++++--------------------
 6 files changed, 120 insertions(+), 78 deletions(-)

diff --git a/Makefile b/Makefile
index e6f6d11..93fe681 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 # $Id$
 
-CFLAGS=-Igensrc -ggdb
+CFLAGS = -Igensrc -ggdb
 
 all: glwrap.so gldump
 
diff --git a/genwrap.py b/genwrap.py
index 35e3439..7f87c7f 100755
--- a/genwrap.py
+++ b/genwrap.py
@@ -254,17 +254,17 @@ out.write("} GlDecoder;\n")
 
 out = open(os.path.join(outdir, "gldecoder.funcs"), "w")
 for f in funcs:
-	out.write("static unsigned decode_%s(GlDecoder *dec, const char *data, unsigned len)\n{\n"%(f[0]))
+	out.write("static unsigned decode_%s(GlDecoder *dec, const char *data)\n{\n"%(f[0]))
 	out.write("\tunsigned pos = 0;\n")
 	if f[1]!="void":
 		out.write("\t%s ret;\n"%f[1])
 	for p in f[2]:
 		out.write("\t%s arg_%s;\n"%(p[1], p[0]))
 	if f[1]!="void":
-		out.write("\tpos += read_%s(&ret, data+pos, len);\n"%iomap[f[1]])
+		out.write("\tpos += read_%s(&ret, data+pos);\n"%iomap[f[1]])
 	for p in f[2]:
 		(t, c) = getread(f, p)
-		out.write("\tpos += read_%s(%s&arg_%s, data+pos, len-pos);\n"%(t, c, p[0]))
+		out.write("\tpos += read_%s(%s&arg_%s, data+pos);\n"%(t, c, p[0]))
 	out.write("\tif(dec->%s)\n"%f[0])
 	out.write("\t\tdec->%s(dec->user_data"%f[0])
 	if f[1]!="void":
@@ -275,20 +275,16 @@ for f in funcs:
 	out.write("\treturn pos;\n")
 	out.write("}\n\n")
 
-out.write("""unsigned gldecoder_decode(GlDecoder *dec, const char *data, unsigned len)
+out.write("""static int decode_func(GlDecoder *dec, short func, const char *data)
 {
-	unsigned pos = 0;
-	short func;
-
-	pos += read_short(&func, data, len);
 	switch(func)
 	{
 """)
 for f in funcs:
-	out.write("\t\tcase FUNC_%s: pos += decode_%s(dec, data+pos, len); break;\n"%(f[0].upper(), f[0]))
+	out.write("\t\tcase FUNC_%s: return decode_%s(dec, data);\n"%(f[0].upper(), f[0]))
 out.write("""	}
 
-	return pos;
+	return -1;
 }
 """)
 out.close()
diff --git a/source/gldecoder.c b/source/gldecoder.c
index 93a5258..85d089d 100644
--- a/source/gldecoder.c
+++ b/source/gldecoder.c
@@ -10,6 +10,10 @@ Distributed under the GPL
 #include "functions.h"
 #include "gldecoder.h"
 
+static unsigned read_short(short *, const char *);
+static unsigned read_int(int *, const char *);
+static int decode_func(GlDecoder *, short, const char *);
+
 GlDecoder *gldecoder_new(void *user_data, void (*destroy)(void *))
 {
 	GlDecoder *dec;
@@ -29,72 +33,94 @@ void gldecoder_delete(GlDecoder *dec)
 	free(dec);
 }
 
-unsigned read_char(char *v, const char *data, unsigned len)
+int gldecoder_decode(GlDecoder *dec, const char *data, unsigned len)
+{
+	unsigned pos = 0;
+	int pktlen;
+	short func;
+	int ret;
+
+	if(len<sizeof(int)+sizeof(short))
+		return -1;
+	pos += read_int(&pktlen, data);
+	if(len<pktlen)
+		return -1;
+	pos += read_short(&func, data+pos);
+	ret = decode_func(dec, func, data+pos);
+	if(ret<0)
+		return -1;
+	return pos+ret;
+}
+
+static unsigned read_char(char *v, const char *data)
 {
 	*v = *data;
 	return 1;
 }
 
-unsigned read_short(short *v, const char *data, unsigned len)
+static unsigned read_short(short *v, const char *data)
 {
 	*v = *(short *)data;
 	return sizeof(short);
 }
 
-unsigned read_int(int *v, const char *data, unsigned len)
+static unsigned read_int(int *v, const char *data)
 {
 	*v = *(int *)data;
 	return sizeof(int);
 }
 
-unsigned read_long(long *v, const char *data, unsigned len)
+static unsigned read_long(long *v, const char *data)
 {
 	*v = *(long *)data;
 	return sizeof(long);
 }
 
-unsigned read_ulong(unsigned long *v, const char *data, unsigned len)
+static unsigned read_ulong(unsigned long *v, const char *data)
 {
 	*v = *(unsigned long *)data;
 	return sizeof(unsigned long);
 }
 
-unsigned read_longlong(long long *v, const char *data, unsigned len)
+static unsigned read_longlong(long long *v, const char *data)
 {
 	*v = *(long long *)data;
 	return sizeof(long long);
 }
 
-unsigned read_float(float *v, const char *data, unsigned len)
+static unsigned read_float(float *v, const char *data)
 {
 	*v = *(float *)data;
 	return sizeof(float);
 }
 
-unsigned read_double(double *v, const char *data, unsigned len)
+static unsigned read_double(double *v, const char *data)
 {
 	*v = *(double *)data;
 	return sizeof(double);
 }
 
-unsigned read_pointer(void **v, const char *data, unsigned len)
+static unsigned read_pointer(void **v, const char *data)
 {
 	*v = *(void **)data;
 	return sizeof(void *);
 }
 
-unsigned read_data(const void **v, const char *data, unsigned len)
+static unsigned read_data(const void **v, const char *data)
 {
 	int vlen;
 	unsigned pos = 0;
-	pos += read_int(&vlen, data, len);
-	*v = data+pos;
+	pos += read_int(&vlen, data);
+	if(vlen)
+		*v = data+pos;
+	else
+		*v = NULL;
 	return pos+vlen;
 }
 
-unsigned read_string(const unsigned char **v, const char *data, unsigned len)
+static unsigned read_string(const unsigned char **v, const char *data)
 {
-	return read_data((const void **)v, data, len);
+	return read_data((const void **)v, data);
 }
 
 #include "gldecoder.funcs"
diff --git a/source/gldecoder.h b/source/gldecoder.h
index 41f785c..2b76b40 100644
--- a/source/gldecoder.h
+++ b/source/gldecoder.h
@@ -13,6 +13,6 @@ Distributed under the GPL
 
 GlDecoder *gldecoder_new(void *, void (*)(void *));
 void gldecoder_delete(GlDecoder *);
-unsigned gldecoder_decode(GlDecoder *, const char *, unsigned);
+int gldecoder_decode(GlDecoder *, const char *, unsigned);
 
 #endif
diff --git a/source/gldump.c b/source/gldump.c
index 3a6707b..79896c2 100644
--- a/source/gldump.c
+++ b/source/gldump.c
@@ -7,43 +7,54 @@ Distributed under the GPL
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
 #include "glprint.h"
 
 int main(int argc, char **argv)
 {
-	FILE *in;
+	int fd;
+	struct stat st;
 	GlDecoder *dec;
-	char *buf;
-	unsigned size;
-	unsigned start;
-	unsigned end;
+	char *addr;
+	char *end;
+	char *ptr;
 
-	in = fopen(argv[1], "r");
+	if(argc<2)
+	{
+		fprintf(stderr, "Usage: %s <dumpfile>\n", argv[0]);
+		return 1;
+	}
+
+	fd = open(argv[1], O_RDONLY);
+	if(fd==-1)
+	{
+		perror("open");
+		return 1;
+	}
+	fstat(fd, &st);
+	addr = (char *)mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
+	end = addr+st.st_size;
+	ptr = addr;
 
 	dec = glprint_new(NULL, 0);
 
-	size = 16384;
-	buf = (char *)malloc(size);
-	start = 0;
-	end = 0;
-	while(1)
+	while(ptr<end)
 	{
-		if(start>size/2)
+		int ret;
+		ret = gldecoder_decode(dec, ptr, end-ptr);
+		if(ret<0)
 		{
-			memmove(buf, buf+start, end-start);
-			end -= start;
-			start = 0;
-		}
-		if(end<size && !feof(in))
-			end += fread(buf+end, 1, size-end, in);
-		else if(start==end)
+			fprintf(stderr, "Decode error\n");
 			break;
-		start += gldecoder_decode(dec, buf+start, end-start);
+		}
+		ptr += ret;
 		printf("%s\n", glprint_get_buffer(dec));
 	}
-	fclose(in);
-	free(buf);
+	munmap(addr, st.st_size);
+	close(fd);
 	gldecoder_delete(dec);
 
 	return 0;
diff --git a/source/glwrap.c b/source/glwrap.c
index a33021a..38f5e27 100644
--- a/source/glwrap.c
+++ b/source/glwrap.c
@@ -15,10 +15,10 @@ Distributed under the GPL
 
 static inline void *glsym(const char *sym)
 {
-	static void *libgl=NULL;
+	static void *libgl = NULL;
 	if(!libgl)
 	{
-		libgl=dlopen("libGL.so", RTLD_NOW);
+		libgl = dlopen("libGL.so", RTLD_NOW);
 		if(!libgl)
 		{
 			fprintf(stderr, "Could not open libGL: %s\n", dlerror());
@@ -29,18 +29,20 @@ static inline void *glsym(const char *sym)
 	return dlsym(libgl, sym);
 }
 
-char *buffer=0;
-char *write_pos;
-struct iovec *iovecs=0;
-struct iovec *cur_vec;
+static char *buffer = 0;
+static char *write_pos;
+static struct iovec *iovecs = 0;
+static struct iovec *cur_vec;
+static unsigned length;
 
 static inline void next_vec()
 {
 	if(write_pos!=cur_vec->iov_base)
 	{
-		cur_vec->iov_len=write_pos-(char *)cur_vec->iov_base;
+		cur_vec->iov_len = write_pos-(char *)cur_vec->iov_base;
+		length += cur_vec->iov_len;
 		++cur_vec;
-		cur_vec->iov_base=write_pos;
+		cur_vec->iov_base = write_pos;
 	}
 }
 
@@ -48,12 +50,12 @@ static inline void write_bytes(const char *ptr, unsigned size)
 {
 	unsigned i;
 	for(i=0; i<size; ++i)
-		*write_pos++=*ptr++;
+		*write_pos++ = *ptr++;
 }
 
 static inline void write_char(char v)
 {
-	*write_pos++=v;
+	*write_pos++ = v;
 }
 
 static inline void write_short(short v)
@@ -86,7 +88,7 @@ static inline void write_float(float v)
 	write_bytes((char *)&v, sizeof(float));
 }
 
-static inline void write_double(float v)
+static inline void write_double(double v)
 {
 	write_bytes((char *)&v, sizeof(double));
 }
@@ -98,46 +100,53 @@ static inline void write_pointer(const void *p)
 
 static inline void write_data(const void *data, unsigned size)
 {
-	write_int(size);
-	next_vec();
-	cur_vec->iov_base=(void *)data;
-	cur_vec->iov_len=size;
-	++cur_vec;
-	cur_vec->iov_base=write_pos;
+	if(data)
+	{
+		write_int(size);
+		next_vec();
+		cur_vec->iov_base = (void *)data;
+		cur_vec->iov_len = size;
+		length += size;
+		++cur_vec;
+		cur_vec->iov_base = write_pos;
+	}
+	else
+		write_int(0);
 }
 
 static inline void write_string(const unsigned char *s)
 {
 	write_data(s, strlen(s));
-	/*int len=strlen(s);
-	write_int(len);
-	write_bytes(s, len);*/
 }
 
 static inline void begin_packet(int func)
 {
 	if(!buffer)
-		buffer=(char *)malloc(1024);
+		buffer = (char *)malloc(1024);
 	if(!iovecs)
-		iovecs=(struct iovec *)malloc(16*sizeof(struct iovec));
-	write_pos=buffer;
-	cur_vec=iovecs;
-	cur_vec->iov_base=write_pos;
+		iovecs = (struct iovec *)malloc(16*sizeof(struct iovec));
+	write_pos = buffer;
+	cur_vec = iovecs;
+	cur_vec->iov_base = write_pos;
+	length = 0;
+	write_int(0);
 	write_short(func);
 }
 
 static inline void send_packet()
 {
-	static int fd=-1;
+	static int fd = -1;
 	if(fd<0)
 	{
-		const char *var=getenv("GLWRAP_FD");
+		const char *var = getenv("GLWRAP_FD");
 		if(var)
-			fd=strtol(var, NULL, 0);
+			fd = strtol(var, NULL, 0);
 		else
-			fd=2;
+			fd = 2;
 	}
 	next_vec();
+	write_pos = buffer;
+	write_int(length);
 	writev(fd, iovecs, cur_vec-iovecs);
 }
 
-- 
2.43.0