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/* This program compresses the help content found in help/ to standard
* output. Do not directly compile or use this program, instead it
* will be automatically used by genhelp.sh */
#include <ctype.h>
#include <lz4hc.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "help.h"
char *compress(const char *in, int inlen, int *rc, int *minsz, int *minlev)
{
int maxsz = LZ4_compressBound(inlen);
unsigned char *outbuf = malloc(maxsz);
*minsz = 9999999;
*minlev = 0;
for(int i = LZ4HC_CLEVEL_MIN; i < LZ4HC_CLEVEL_MAX; ++i)
{
*rc = LZ4_compress_HC(help_text, outbuf, inlen, maxsz, i);
if(!*rc)
{
fprintf(stderr, "compress failed\n");
return NULL;
}
if(*rc < *minsz)
{
*minsz = *rc;
*minlev = i;
}
}
*rc = LZ4_compress_HC(help_text, outbuf, inlen, maxsz, *minlev);
return outbuf;
}
void dump_bytes(unsigned char *buf, int len)
{
int i = 0;
while(i < len)
{
int stop = i + 10;
for(;i < stop && i < len; ++i)
{
printf("0x%02x, ", buf[i]);
}
printf("\n");
}
}
int main()
{
int inlen = strlen(help_text) + 1, len;
int minsz, minlev;
unsigned char *outbuf = compress(help_text, inlen, &len, &minsz, &minlev);
printf("/* auto-generated on " __DATE__ " by genhelp.sh */\n");
printf("/* orig %d comp %d ratio %g level %d saved %d */\n", inlen, minsz, (double)minsz / inlen, minlev, inlen - minsz);
printf("/* DO NOT EDIT! */\n\n");
printf("const char help_text[] = {\n");
dump_bytes(outbuf, len);
free(outbuf);
printf("};\n");
printf("const unsigned short help_text_len = %d;\n", inlen);
return 0;
}
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