Initial

3 files changed, 155 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6793ace
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+bin2c
+*.o
+*.dSYM
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..6e84e3d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,17 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -std=c99 -fwrapv
+ifneq ($(DEBUG),)
+	CFLAGS += -g
+else
+	CFLAGS += -O2
+endif
+BIN = bin2c
+
+.PHONY: all clean remake
+
+all: $(BIN)
+
+clean:
+	rm -rf $(BIN) *.dSYM
+
+remake: clean all
diff --git a/bin2c.c b/bin2c.c
new file mode 100644
index 0000000..dcc0b7c
--- /dev/null
+++ b/bin2c.c
@@ -0,0 +1,135 @@
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#define MAXLINEWIDTH (79)
+
+void usage(){
+	fprintf(stderr,
+		"Usage: bin2c [inputfile] [outputfile]\n"
+		"\n"
+		"Converts a binary file to a C string that denotes the same binary contents, but\n"
+		"is parseable by a C compiler.\n"
+		"Default values for the arguments are stdin and stdout; also '-' indicates the\n"
+		"standard stream.\n");
+}
+
+// Returns serialised string length
+// Keeps state on the previous few characters to aid compression
+int serialisechar(char *dst,unsigned char c){
+	static bool lastwasoctal=false;
+	static unsigned char prevc; // Only used if lastwasoctal==true
+
+	switch(c){
+		case '\a': lastwasoctal=false; dst[0]='\\'; dst[1]='a'; return 2;
+		case '\b': lastwasoctal=false; dst[0]='\\'; dst[1]='b'; return 2;
+		case '\f': lastwasoctal=false; dst[0]='\\'; dst[1]='f'; return 2;
+		case '\n': lastwasoctal=false; dst[0]='\\'; dst[1]='n'; return 2;
+		case '\r': lastwasoctal=false; dst[0]='\\'; dst[1]='r'; return 2;
+		case '\t': lastwasoctal=false; dst[0]='\\'; dst[1]='t'; return 2;
+		case '\v': lastwasoctal=false; dst[0]='\\'; dst[1]='v'; return 2;
+		case '"':  lastwasoctal=false; dst[0]='\\'; dst[1]='"'; return 2;
+		case '\\': lastwasoctal=false; dst[0]='\\'; dst[1]='\\'; return 2;
+		default:
+			if(c<32||c>=127){
+				lastwasoctal=true;
+				prevc=c;
+				return sprintf(dst,"\\%o",(int)c);
+			} else if(isdigit(c)&&lastwasoctal&&prevc<'\100'){
+				prevc=c;
+				return sprintf(dst,"\\%o",(int)c);
+			} else {
+				lastwasoctal=false;
+				dst[0]=c;
+				return 1;
+			}
+	}
+}
+
+// Returns new xposition
+int convertbuffer(FILE *output,const char *buffer,int length,int xposition){
+	char cbuf[8];
+	for(int i=0;i<length;i++){
+		int clen=serialisechar(cbuf,buffer[i]);
+		if(xposition+clen>MAXLINEWIDTH){
+			fputc('"',output);
+			fputc('\n',output);
+			fputc('"',output);
+			xposition=1;
+		}
+		fwrite(cbuf,1,clen,output);
+		xposition+=clen;
+	}
+	return xposition;
+}
+
+void bin2c(FILE *input,FILE *output){
+	fputc('"',output);
+
+	char buffer[1024];
+	int xposition=1;
+
+	while(true){
+		size_t nread=fread(buffer,1,sizeof(buffer),input);
+		if(nread==0){
+			break;
+		}
+		xposition=convertbuffer(output,buffer,nread,xposition);
+		if(feof(input)||ferror(input)){
+			break;
+		}
+	}
+
+	fputc('"',output);
+	fputc('\n',output);
+}
+
+int main(int argc,char **argv){
+	if(argc==1){
+		bin2c(stdin,stdout);
+	} else if(argc==2){
+		if(strcmp(argv[1],"-h")==0||strcmp(argv[1],"--help")==0){
+			usage();
+		} else if(strcmp(argv[1],"-")==0){
+			bin2c(stdin,stdout);
+		} else {
+			FILE *f=fopen(argv[1],"rb");
+			if(!f){
+				fprintf(stderr,"Could not open file '%s'\n",argv[1]);
+				return 1;
+			}
+			bin2c(f,stdout);
+			fclose(f);
+		}
+	} else if(argc==3){
+		FILE *fin,*fout;
+		if(strcmp(argv[1],"-")==0){
+			fin=stdin;
+		} else {
+			fin=fopen(argv[1],"rb");
+			if(!fin){
+				fprintf(stderr,"Could not open file '%s'\n",argv[1]);
+				return 1;
+			}
+		}
+
+		if(strcmp(argv[2],"-")==0){
+			fout=stdout;
+		} else {
+			fout=fopen(argv[2],"rb");
+			if(!fout){
+				fprintf(stderr,"Could not open file '%s'\n",argv[2]);
+				return 1;
+			}
+		}
+
+		bin2c(fin,fout);
+
+		fclose(fin);
+		fclose(fout);
+	} else {
+		usage();
+		return 1;
+	}
+}