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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 <assert.h>
#include <ctype.h>
#include <lz4hc.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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(in, outbuf, inlen, maxsz, i);
if(!*rc)
{
fprintf(stderr, "compress failed\n");
return NULL;
}
if(*rc < *minsz)
{
*minsz = *rc;
*minlev = i;
}
}
*rc = LZ4_compress_HC(in, 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)
{
unsigned char c = buf[i];
printf("0x%02x,", c);
if(i != stop - 1 && i != len - 1)
printf(" ");
}
printf("\n");
}
}
/* Input: help text in help_text array (to be compiled against) as a
* standard C string
* Output: C source code on stdout defining the following:
*
* const char help_text_words[];
* const unsigned short help_text_len;
* struct style_text help_text_style[];
*
* help_text_words consists of help_text_len bytes containing the
* words of the help text, delimited with NULs, not a standard C
* string. The rockbox frontend is responsible for generating an array
* of pointers into this array to pass to display_text. */
int main()
{
int inlen = strlen(help_text) + 1, outlen;
int minsz, minlev;
printf("/* auto-generated on " __DATE__ " by genhelp.sh */\n");
printf("/* help text is compressed using LZ4; see compress.c for details */\n");
printf("/* DO NOT EDIT! */\n\n");
printf("#include \"lib/display_text.h\"\n\n");
printf("struct style_text help_text_style[] = {\n");
/* break up words on spaces and newline while printing indices of
* underlined words */
char *buf = strdup(help_text);
bool underline = false, center = false;
int word_idx = 0, help_text_len = inlen;
for(int i = 0; i < help_text_len; ++i)
{
switch(buf[i])
{
case '#':
case '_':
/* title or underlined portion */
if(buf[i] == '#')
{
center = !center;
if(center)
printf(" { %d, TEXT_CENTER | C_RED },\n", word_idx);
}
else
{
/* underline */
underline = !underline;
if(underline)
printf(" { %d, TEXT_UNDERLINE },\n", word_idx);
}
/* delete the formatting character */
memmove(buf + i, buf + i + 1, help_text_len - i - 1);
--help_text_len;
--i;
break;
case '$':
/* genhelp.sh replaces the underscores in URLs with
* dollar signs to help us out. */
buf[i] = '_';
break;
case '\n':
center = false;
/* fall through */
case ' ':
case '\0':
/* Groups of words that are centered or underlined are
* counted as a single "word". */
if(!underline && !center)
{
buf[i] = '\0';
++word_idx;
}
break;
}
}
/* sanity check */
int words_check = 0;
for(int i = 0; i < help_text_len; ++i)
if(!buf[i])
++words_check;
assert(words_check == word_idx);
printf(" LAST_STYLE_ITEM\n};\n\n");
/* remove trailing NULs */
for(int i = help_text_len - 2; i >= 0 && !buf[i]; --i, --help_text_len, --word_idx);
unsigned char *outbuf = compress(buf, help_text_len, &outlen, &minsz, &minlev);
printf("/* orig %d comp %d ratio %g level %d saved %d */\n", help_text_len, minsz, (double)minsz / help_text_len, minlev, help_text_len - minsz);
printf("const char help_text[] = {\n");
dump_bytes(outbuf, outlen);
free(outbuf);
free(buf);
printf("};\n\n");
printf("const unsigned short help_text_len = %d;\n", help_text_len);
printf("const unsigned short help_text_words = %d;\n", word_idx);
return 0;
}
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