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