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/* fake_au
Fakes a file in SUN .au format from a raw little-endian PCM audio file
(e.g. a file extracted from .wav by test/dewav). The input data are assumed
to be 16 bit, stereo, 44100 Hz.
Copyright (C) 2006 - 2015 Thomas Schmitt <scdbackup@gmx.net>
Provided under GPL version 2 or later.
Info used: http://www.opengroup.org/public/pubs/external/auformat.html
*/
#include <ctype.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
int fake_write(unsigned char *buf, size_t size, FILE *fp)
{
int ret;
ret= fwrite(buf,size,1,fp);
if(ret==1)
return(1);
fprintf(stderr,"Error %d while writing: '%s'\n",errno,strerror(errno));
return(0);
}
int main(int argc, char **argv)
{
int ret, i;
unsigned data_size= 0,byte_count,exit_value= 0;
FILE *fp_out= stdout,*fp_in= stdin;
unsigned char buf[4];
char out_path[4096],in_path[4096];
struct stat stbuf;
strcpy(out_path,"-");
strcpy(in_path,"");
if(argc < 2) {
exit_value= 1;
goto help;
}
for(i= 1; i<argc; i++) {
if(strlen(argv[i]) >= 4096) {
fprintf(stderr,"%s: argument at position %d is much too long.\n",
argv[0], i);
exit(1);
}
}
for(i= 1; i<argc; i++) {
if(strcmp(argv[i],"-o")==0) {
if(i>=argc-1) {
fprintf(stderr,"%s: option -o needs a file address as argument.\n",
argv[0]);
exit(1);
}
i++;
strcpy(out_path, argv[i]);
} else if(strcmp(argv[i],"--stdin_size")==0) {
if(i>=argc-1) {
fprintf(stderr,"%s: option --stdin_size needs a number as argument.\n",
argv[0]);
exit(1);
}
i++;
sscanf(argv[i],"%u",&data_size);
} else if(strcmp(argv[i],"--help")==0) {
exit_value= 0;
help:;
fprintf(stderr,"usage: %s \\\n", argv[0]);
fprintf(stderr," [-o output_path|\"-\"] [source_path | --stdin_size size]\n");
fprintf(stderr,
"Disguises an extracted .wav stream as .au stereo, 16bit, 44100Hz\n");
fprintf(stderr,
"stdin gets byte-swapped and appended up to the announced data_size.\n");
exit(exit_value);
} else {
if(in_path[0]!=0) {
fprintf(stderr,"%s: only one input file is allowed.\n", argv[0]);
exit(1);
}
strcpy(in_path, argv[i]);
}
}
if(strcmp(in_path,"-")==0 || in_path[0]==0) {
if(data_size==0) {
fprintf(stderr,"%s: input from stdin needs option --stdin_size.\n",
argv[0]);
exit(6);
}
fp_in= stdin;
} else {
fp_in= fopen(in_path,"r");
if(stat(in_path,&stbuf)!=-1)
data_size= stbuf.st_size;
}
if(fp_in==NULL) {
fprintf(stderr,"Error %d while fopen(\"%s\",\"r\") : '%s'\n",
errno,in_path,strerror(errno));
exit(2);
}
if(strcmp(out_path,"-")==0) {
fp_out= stdout;
} else {
if(stat(out_path,&stbuf)!=-1) {
fprintf(stderr,"%s: file '%s' already existing\n",argv[0],out_path);
exit(4);
}
fp_out= fopen(out_path,"w");
}
if(fp_out==NULL) {
fprintf(stderr,"Error %d while fopen(\"%s\",\"w\") : '%s'\n",
errno,out_path,strerror(errno));
exit(2);
}
fake_write((unsigned char *) ".snd",4,fp_out); /* magic number */
buf[0]= buf[1]= buf[2]= 0;
buf[3]= 32;
fake_write(buf,4,fp_out); /* data_location */
buf[0]= (data_size>>24)&0xff;
buf[1]= (data_size>>16)&0xff;
buf[2]= (data_size>>8)&0xff;
buf[3]= (data_size)&0xff;
fake_write(buf,4,fp_out); /* data_size */
buf[0]= buf[1]= buf[2]= 0;
buf[3]= 3;
fake_write(buf,4,fp_out); /* encoding 16 Bit PCM */
buf[0]= buf[1]= 0;
buf[2]= 172;
buf[3]= 68;
fake_write(buf,4,fp_out); /* sample rate 44100 Hz */
buf[0]= buf[1]= buf[2]= 0;
buf[3]= 2;
fake_write(buf,4,fp_out); /* number of channels */
buf[0]= buf[1]= buf[2]= buf[3]= 0;
fake_write(buf,4,fp_out); /* padding */
fake_write(buf,4,fp_out); /* padding */
for(byte_count= 0; byte_count<data_size; byte_count+=2) {
ret= fread(buf,2,1,fp_in);
if(ret<=0) {
fprintf(stderr,"Premature end end of input\n");
exit_value= 5;
break;
}
buf[3]= buf[0];
buf[2]= buf[1];
ret= fake_write(buf+2,2,fp_out);
if(ret<=0) {
exit_value= 3;
break;
}
}
if(fp_out!=stdout)
fclose(fp_out);
if(fp_in!=stdin)
fclose(fp_in);
fprintf(stderr, "Swapped and appended: %u stdin bytes\n",byte_count);
exit(exit_value);
}