#include <stdlib.h>
#include <stdio.h>

#include <string.h>

#include <zlib.h>

#define INIT_BUFFER		(64*1024)
#define BUFFER_INCREMENT	(64*1024)
#define READ_SIZE		(4*1024)

#ifndef MIN
static inline int MIN(int a, int b) {
	if(a < b)
		return a;
	else
		return b;
}
#endif /* !defined MIN */

static char *read_and_compress(FILE *fh, size_t *orig, size_t *ret) {
	unsigned long len;
	char *input,*output;
	size_t pos = 0,bufsize = INIT_BUFFER;
	
	input = malloc(bufsize);
	
	while(!feof(fh) && (*ret = fread(input+pos,1,READ_SIZE,fh)) != 0) {
		pos += *ret;
		if(pos >= (bufsize - READ_SIZE)) {
			bufsize += BUFFER_INCREMENT;
			input = realloc(input,bufsize);
		}
			
	}
	
	len = pos;
	*orig = len;
	output = malloc(len*2);
	compress2(output,&len,input,len,Z_BEST_COMPRESSION);
	free(input);

	*ret = (size_t) len;
	return output;
}
	

static void process(FILE *fh, const char *var_prefix) {
	size_t clen = 0;
	size_t tlen = 0;
	char *data;
	int i,j;

	data = read_and_compress(fh,&tlen,&clen);
	
	fprintf(stdout,"static char %s_data[] = {\n",var_prefix);
	for(i = 0; i < clen; i += j) {
		fprintf(stdout,"\t");
		for(j = 0; j < MIN(12,clen-i); ++j) {
			fprintf(stdout,"0x%02x, ",(unsigned char) data[i+j]);
		}
		fprintf(stdout,"\n");
	}
	fprintf(stdout,"\t0x%02x\n};\n",0);
	fprintf(stdout,"static size_t %s_size = %ld;\n",
			var_prefix,(long)clen);
	fprintf(stdout,"static size_t %s_original_size = %ld;\n",
			var_prefix,(long)tlen);
}	

int main(int argc, char *argv[]) {
	char *file,*var_prefix;
	FILE *fh;
	
	if(argc < 3) {
		fprintf(stderr,"%s <file> <variable prefix>\n",argv[0]);
		return 1;
	}
	file = argv[1];
	var_prefix = argv[2];

	if(strcmp(file,"-") != 0) {
		fh = fopen(file,"rb");
		if(fh == NULL) {
			fprintf(stderr,"Failed to open file: %s\n",file);
			return 1;
		}
	} else
		fh = stdin;

	process(fh,var_prefix);

	if(strcmp(file,"-") != 0)
		fclose(fh);

	return 0;
}