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/*
QuickNDirty bash equivalent:
bash-deflate(){ gzip -c | tail -c +10; }
*/
#include "commonbase.h"
/* system */
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* libs */
#include <zlib.h>
typedef unsigned char uchar; /* TODO rm */
typedef struct Deflate Deflate;
struct Deflate {
int level;
int useZlibHdr;
};
static void printHelp( void ){
printf("\n %s%s", strrchr(__FILE__,'/')+1, " " STR_QUOT(PROJECT_VERSION) "\n"
"\n"
" deflates stdin to stdout\n"
"\n"
" Options:\n"
"\n"
" --level\n"
" Compression level 0-9 (0 fastest, 9 smallest).\n"
"\n"
" --zlib\n"
" Prepend output with a zlib header.\n"
"\n");
}
static int parseArgs( int argc, char**argv, Deflate*deflateCls ){
deflateCls->level = Z_DEFAULT_COMPRESSION;
deflateCls->useZlibHdr = 0;
for( int i = 1 ; i < argc ; ++i ){
char *arg = argv[i];
if( !strcmp(arg,"--help") ){
printHelp(); return -1;
}else if( !strcmp(arg,"--level") ){
arg = argv[++i];
if( arg == NULL ){ fprintf(stderr, "Arg level needs a value\n"); return -1; }
char *end;
deflateCls->level = strtol(arg, &end, 10);
if( arg == end ){ fprintf(stderr, "Failed to parse '%s'\n", arg); return -1; }
if( deflateCls->level < 0 || deflateCls->level > 9 ){
fprintf(stderr, "OutOfRange: %s %s\n", argv[i-1], arg); return -1;
}
}else if( !strcmp(arg,"--zlib") ){
deflateCls->useZlibHdr = !0;
}else{
fprintf(stderr, "Unknown arg: %s\n", arg);
return -1;
}
}
return 0;
}
static int doDeflate( Deflate*deflateCls ){
int err;
z_stream strm;
uchar innBuf[1<<18];
const int innBuf_cap = sizeof innBuf;
int innBuf_len = 0, innBuf_off = 0;
uchar outBuf[1<<18];
const int outBuf_cap = sizeof outBuf;
int outBuf_len = 0;
int zlibHdrWritten = deflateCls->useZlibHdr ? 2 : 0;
int inputIsEOF = 0;
int outputIsEOF = 0;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.next_in = innBuf;
strm.avail_in = innBuf_len;
err = deflateInit(&strm, deflateCls->level);
if( err != Z_OK ){
fprintf(stderr, "Error: deflateInit(): (ret=%d): %s\n", err, strerror(errno));
return -1;
}
for(; !outputIsEOF ;){
/* input */ {
int space = innBuf_cap - innBuf_len;
/* look if we can shift */
if( space <= 0 && innBuf_off > 0 ){
int wr = 0, rd = innBuf_off;
for(;;){
err = rd - wr; /* chunk length to copy */
if( rd + err > innBuf_cap) err = innBuf_cap - rd;
if( err <= 0 ) break;
memcpy(innBuf + wr, innBuf + rd, err);
rd += err;
wr += err;
}
innBuf_len -= innBuf_off;
innBuf_off = 0;
space = innBuf_cap - innBuf_len;
}
if( space > 0 && !inputIsEOF ){
err = fread(innBuf + innBuf_len, 1, space, stdin);
if(unlikely( err <= 0 )){
if( feof(stdin) ){
inputIsEOF = !0;
}else{
fprintf(stderr, "Error: fread(): %s\n", strerror(errno));
return -1;
}
}
assert(err <= space);
innBuf_len += err;
}
assert(innBuf_len - innBuf_off >= 0);
}
/* process */ {
strm.next_in = innBuf + innBuf_off;
strm.avail_in = innBuf_len - innBuf_off;
strm.next_out = outBuf;
strm.avail_out = outBuf_cap;
assert(strm.avail_out > 0);
assert(strm.avail_in > 0 || inputIsEOF);
err = deflate(&strm, inputIsEOF ? Z_FINISH : Z_NO_FLUSH);
if(unlikely( err != Z_OK )){
if( err == Z_STREAM_END ){
outputIsEOF = !0;
}else{
fprintf(stderr, "Error: deflate(): %s\n", strm.msg);
return -1;
}
}
innBuf_off = strm.next_in - innBuf;
outBuf_len = strm.next_out - outBuf;
}
/* output */ {
int outBuf_off = 0;
if( zlibHdrWritten < 2 ){
/* try to skip up to 2 bytes */
err = 2 - zlibHdrWritten;
if( outBuf_len < err ){ err = outBuf_len; }
zlibHdrWritten += err;
outBuf_off += err;
}
err = fwrite(outBuf + outBuf_off, 1, outBuf_len - outBuf_off, stdout);
if(unlikely( err != outBuf_len - outBuf_off )){
fprintf(stderr, "Error: fwrite(): %s\n", strerror(errno));
return -1;
}
outBuf_len = 0;
}
}
err = deflateEnd(&strm);
if( err != Z_OK ){
fprintf(stderr, "Warn: deflateEnd() ret=%d: %s\n", err, strm.msg);
return -2;
}
return 0;
}
int deflate_main( int argc, char**argv ){
int err;
Deflate deflateCls;
#define deflateCls (&deflateCls)
err = parseArgs(argc, argv, deflateCls);
if( err < 0 ){ return err; }
fixBrokenStdio();
err = doDeflate(deflateCls);
if( err < 0 ){ return err; }
return 0;
#undef deflate
}
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