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/* Ocrcheck - A test program for the library ocradlib
Copyright (C) 2009-2024 Antonio Diaz Diaz.
This program is free software: you have unlimited permission to
copy, distribute, and modify it.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include "arg_parser.h"
#include "ocradlib.h"
namespace {
const char * const program_name = "ocradcheck";
const char * invocation_name = program_name; // default value
void show_help()
{
std::printf( "Ocradcheck is a test program for the library ocradlib. It reads the image\n"
"files specified, feeds them to the OCR engine, and sends the resulting text\n"
"to stdout.\n"
"\nUsage: %s [options] [files]\n", invocation_name );
std::printf( "\nOptions:\n"
" -h, --help display this help and exit\n"
" -V, --version output version information and exit\n"
" -i, --invert invert image levels (white on black)\n"
" -l, --layout perform layout analysis\n"
" -u, --utf8 output text in UTF-8 format [default byte]\n"
"\nIf no files are specified, or if a file is '-', ocradcheck reads the image\n"
"from standard input.\n" );
}
void show_version()
{
std::printf( "%s %s\n", program_name, PROGVERSION );
std::printf( "Using ocradlib %s\n", OCRAD_version() );
}
void show_error( const char * const msg, const int errcode = 0,
const bool help = false )
{
if( msg && msg[0] )
std::fprintf( stderr, "%s: %s%s%s\n", program_name, msg,
( errcode > 0 ) ? ": " : "",
( errcode > 0 ) ? std::strerror( errcode ) : "" );
if( help )
std::fprintf( stderr, "Try '%s --help' for more information.\n",
invocation_name );
}
} // end namespace
int main( const int argc, const char * const argv[] )
{
bool invert = false;
bool layout = false;
bool utf8 = false;
if( argc > 0 ) invocation_name = argv[0];
const Arg_parser::Option options[] =
{
{ 'h', "help", Arg_parser::no },
{ 'i', "invert", Arg_parser::no },
{ 'l', "layout", Arg_parser::no },
{ 'u', "utf8", Arg_parser::no },
{ 'V', "version", Arg_parser::no },
{ 0 , 0, Arg_parser::no } };
const Arg_parser parser( argc, argv, options );
if( parser.error().size() ) // bad option
{ show_error( parser.error().c_str(), 0, true ); return 1; }
int argind = 0;
for( ; argind < parser.arguments(); ++argind )
{
const int code = parser.code( argind );
if( !code ) break; // no more options
switch( code )
{
case 'h': show_help(); return 0;
case 'i': invert = true; break;
case 'l': layout = true; break;
case 'u': utf8 = true; break;
case 'V': show_version(); return 0;
default: std::fprintf( stderr, "%s: internal error: uncaught option.\n",
program_name ); return 3;
}
} // end process options
if( OCRAD_version()[0] != OCRAD_version_string[0] )
{ std::fputs( "wrong library version.\n", stderr ); return 3; }
if( std::strcmp( PROGVERSION, OCRAD_version_string ) != 0 )
{ std::fputs( "wrong library version_string.\n", stderr ); return 3; }
// process any remaining command-line arguments (input files)
bool stdin_used = false;
for( bool first = true; first || argind < parser.arguments(); first = false )
{
const char * infile_name;
if( argind < parser.arguments() )
infile_name = parser.argument( argind++ ).c_str();
else
{ infile_name = "-"; if( stdin_used ) continue; else stdin_used = true; }
OCRAD_Descriptor * const ocrdes = OCRAD_open();
if( !ocrdes || OCRAD_get_errno( ocrdes ) != OCRAD_ok )
{
OCRAD_close( ocrdes );
std::fputs( "Not enough memory.\n", stderr );
return 1;
}
if( OCRAD_set_image_from_file( ocrdes, infile_name, invert ) < 0 )
{
const OCRAD_Errno ocr_errno = OCRAD_get_errno( ocrdes );
OCRAD_close( ocrdes );
if( ocr_errno == OCRAD_mem_error )
std::fputs( "Not enough memory.\n", stderr );
else
std::fprintf( stderr, "%s: Can't open file for reading.\n", infile_name );
return 1;
}
// std::fprintf( stderr, "ocradcheck: testing file '%s'\n", infile_name );
if( ( utf8 && OCRAD_set_utf8_format( ocrdes, true ) < 0 ) ||
OCRAD_set_threshold( ocrdes, -1 ) < 0 || // auto threshold
OCRAD_recognize( ocrdes, layout ) < 0 )
{
const OCRAD_Errno ocr_errno = OCRAD_get_errno( ocrdes );
OCRAD_close( ocrdes );
if( ocr_errno == OCRAD_mem_error )
{ std::fputs( "Not enough memory.\n", stderr ); return 1; }
std::fprintf( stderr, "%s: internal error: invalid argument.\n",
program_name ); return 3;
}
const int blocks = OCRAD_result_blocks( ocrdes );
int chars_total_by_block = 0;
int chars_total_by_line = 0;
int chars_total_by_count = 0;
for( int b = 0; b < blocks; ++b )
{
const int lines = OCRAD_result_lines( ocrdes, b );
chars_total_by_block += OCRAD_result_chars_block( ocrdes, b );
for( int l = 0; l < lines; ++l )
{
const char * const s = OCRAD_result_line( ocrdes, b, l );
chars_total_by_line += OCRAD_result_chars_line( ocrdes, b, l );
if( s && s[0] )
{
std::fputs( s, stdout );
const int len = std::strlen( s ) - 1;
if( !utf8 )
chars_total_by_count += len;
else
for( int i = 0; i < len; ++i )
if( (uint8_t)s[i] < 128 || (uint8_t)s[i] >= 0xC0 )
++chars_total_by_count;
}
}
std::fputc( '\n', stdout );
}
const int chars_total = OCRAD_result_chars_total( ocrdes );
if( chars_total_by_block != chars_total ||
chars_total_by_line != chars_total ||
chars_total_by_count != chars_total )
{
std::fprintf( stderr, "library_error: character counts differ.\n"
"%d %d %d %d\n", chars_total, chars_total_by_block,
chars_total_by_line, chars_total_by_count );
return 1;
}
OCRAD_close( ocrdes );
}
return 0;
}
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