ref: e9c50fa77de58b749b4b95706f7b55bfff0dd27f
dir: /src/psaux/psconv.c/
/****************************************************************************
*
* psconv.c
*
* Some convenience conversions (body).
*
* Copyright (C) 2006-2021 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#include <freetype/internal/psaux.h>
#include <freetype/internal/ftdebug.h>
#include "psconv.h"
#include "psauxerr.h"
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT psconv
/* The following array is used by various functions to quickly convert */
/* digits (both decimal and non-decimal) into numbers. */
#if 'A' == 65
/* ASCII */
static const FT_Char ft_char_table[128] =
{
/* 0x00 */
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1,
};
/* no character >= 0x80 can represent a valid number */
#define OP >=
#endif /* 'A' == 65 */
#if 'A' == 193
/* EBCDIC */
static const FT_Char ft_char_table[128] =
{
/* 0x80 */
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, -1, -1, -1, -1, -1, -1,
-1, 19, 20, 21, 22, 23, 24, 25, 26, 27, -1, -1, -1, -1, -1, -1,
-1, -1, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, -1, -1, -1, -1, -1, -1,
-1, 19, 20, 21, 22, 23, 24, 25, 26, 27, -1, -1, -1, -1, -1, -1,
-1, -1, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
};
/* no character < 0x80 can represent a valid number */
#define OP <
#endif /* 'A' == 193 */
FT_LOCAL_DEF( FT_Long )
PS_Conv_Strtol( FT_Byte** cursor,
FT_Byte* limit,
FT_Long base )
{
FT_Byte* p = *cursor;
FT_Long num = 0;
FT_Bool sign = 0;
FT_Bool have_overflow = 0;
FT_Long num_limit;
FT_Char c_limit;
if ( p >= limit )
goto Bad;
if ( base < 2 || base > 36 )
{
FT_TRACE4(( "!!!INVALID BASE:!!!" ));
return 0;
}
if ( *p == '-' || *p == '+' )
{
sign = FT_BOOL( *p == '-' );
p++;
if ( p == limit )
goto Bad;
/* only a single sign is allowed */
if ( *p == '-' || *p == '+' )
return 0;
}
num_limit = 0x7FFFFFFFL / base;
c_limit = (FT_Char)( 0x7FFFFFFFL % base );
for ( ; p < limit; p++ )
{
FT_Char c;
if ( IS_PS_SPACE( *p ) || *p OP 0x80 )
break;
c = ft_char_table[*p & 0x7F];
if ( c < 0 || c >= base )
break;
if ( num > num_limit || ( num == num_limit && c > c_limit ) )
have_overflow = 1;
else
num = num * base + c;
}
*cursor = p;
if ( have_overflow )
{
num = 0x7FFFFFFFL;
FT_TRACE4(( "!!!OVERFLOW:!!!" ));
}
if ( sign )
num = -num;
return num;
Bad:
FT_TRACE4(( "!!!END OF DATA:!!!" ));
return 0;
}
FT_LOCAL_DEF( FT_Long )
PS_Conv_ToInt( FT_Byte** cursor,
FT_Byte* limit )
{
FT_Byte* p = *cursor;
FT_Byte* curp;
FT_Long num;
curp = p;
num = PS_Conv_Strtol( &p, limit, 10 );
if ( p == curp )
return 0;
if ( p < limit && *p == '#' )
{
p++;
curp = p;
num = PS_Conv_Strtol( &p, limit, num );
if ( p == curp )
return 0;
}
*cursor = p;
return num;
}
FT_LOCAL_DEF( FT_Fixed )
PS_Conv_ToFixed( FT_Byte** cursor,
FT_Byte* limit,
FT_Long power_ten )
{
FT_Byte* p = *cursor;
FT_Byte* curp;
FT_Fixed integral = 0;
FT_Long decimal = 0;
FT_Long divider = 1;
FT_Bool sign = 0;
FT_Bool have_overflow = 0;
FT_Bool have_underflow = 0;
if ( p >= limit )
goto Bad;
if ( *p == '-' || *p == '+' )
{
sign = FT_BOOL( *p == '-' );
p++;
if ( p == limit )
goto Bad;
/* only a single sign is allowed */
if ( *p == '-' || *p == '+' )
return 0;
}
/* read the integer part */
if ( *p != '.' )
{
curp = p;
integral = PS_Conv_ToInt( &p, limit );
if ( p == curp )
return 0;
if ( integral > 0x7FFF )
have_overflow = 1;
else
integral = (FT_Fixed)( (FT_UInt32)integral << 16 );
}
/* read the decimal part */
if ( p < limit && *p == '.' )
{
p++;
for ( ; p < limit; p++ )
{
FT_Char c;
if ( IS_PS_SPACE( *p ) || *p OP 0x80 )
break;
c = ft_char_table[*p & 0x7F];
if ( c < 0 || c >= 10 )
break;
/* only add digit if we don't overflow */
if ( divider < 0xCCCCCCCL && decimal < 0xCCCCCCCL )
{
decimal = decimal * 10 + c;
if ( !integral && power_ten > 0 )
power_ten--;
else
divider *= 10;
}
}
}
/* read exponent, if any */
if ( p + 1 < limit && ( *p == 'e' || *p == 'E' ) )
{
FT_Long exponent;
p++;
curp = p;
exponent = PS_Conv_ToInt( &p, limit );
if ( curp == p )
return 0;
/* arbitrarily limit exponent */
if ( exponent > 1000 )
have_overflow = 1;
else if ( exponent < -1000 )
have_underflow = 1;
else
power_ten += exponent;
}
*cursor = p;
if ( !integral && !decimal )
return 0;
if ( have_overflow )
goto Overflow;
if ( have_underflow )
goto Underflow;
while ( power_ten > 0 )
{
if ( integral >= 0xCCCCCCCL )
goto Overflow;
integral *= 10;
if ( decimal >= 0xCCCCCCCL )
{
if ( divider == 1 )
goto Overflow;
divider /= 10;
}
else
decimal *= 10;
power_ten--;
}
while ( power_ten < 0 )
{
integral /= 10;
if ( divider < 0xCCCCCCCL )
divider *= 10;
else
decimal /= 10;
if ( !integral && !decimal )
goto Underflow;
power_ten++;
}
if ( decimal )
{
decimal = FT_DivFix( decimal, divider );
/* it's not necessary to check this addition for overflow */
/* due to the structure of the real number representation */
integral += decimal;
}
Exit:
if ( sign )
integral = -integral;
return integral;
Bad:
FT_TRACE4(( "!!!END OF DATA:!!!" ));
return 0;
Overflow:
integral = 0x7FFFFFFFL;
FT_TRACE4(( "!!!OVERFLOW:!!!" ));
goto Exit;
Underflow:
FT_TRACE4(( "!!!UNDERFLOW:!!!" ));
return 0;
}
#if 0
FT_LOCAL_DEF( FT_UInt )
PS_Conv_StringDecode( FT_Byte** cursor,
FT_Byte* limit,
FT_Byte* buffer,
FT_Offset n )
{
FT_Byte* p;
FT_UInt r = 0;
for ( p = *cursor; r < n && p < limit; p++ )
{
FT_Byte b;
if ( *p != '\\' )
{
buffer[r++] = *p;
continue;
}
p++;
switch ( *p )
{
case 'n':
b = '\n';
break;
case 'r':
b = '\r';
break;
case 't':
b = '\t';
break;
case 'b':
b = '\b';
break;
case 'f':
b = '\f';
break;
case '\r':
p++;
if ( *p != '\n' )
{
b = *p;
break;
}
/* no break */
case '\n':
continue;
break;
default:
if ( IS_PS_DIGIT( *p ) )
{
b = *p - '0';
p++;
if ( IS_PS_DIGIT( *p ) )
{
b = b * 8 + *p - '0';
p++;
if ( IS_PS_DIGIT( *p ) )
b = b * 8 + *p - '0';
else
{
buffer[r++] = b;
b = *p;
}
}
else
{
buffer[r++] = b;
b = *p;
}
}
else
b = *p;
break;
}
buffer[r++] = b;
}
*cursor = p;
return r;
}
#endif /* 0 */
FT_LOCAL_DEF( FT_UInt )
PS_Conv_ASCIIHexDecode( FT_Byte** cursor,
FT_Byte* limit,
FT_Byte* buffer,
FT_Offset n )
{
FT_Byte* p;
FT_UInt r = 0;
FT_UInt w = 0;
FT_UInt pad = 0x01;
n *= 2;
#if 1
p = *cursor;
if ( p >= limit )
return 0;
if ( n > (FT_UInt)( limit - p ) )
n = (FT_UInt)( limit - p );
/* we try to process two nibbles at a time to be as fast as possible */
for ( ; r < n; r++ )
{
FT_UInt c = p[r];
if ( IS_PS_SPACE( c ) )
continue;
if ( c OP 0x80 )
break;
c = (FT_UInt)ft_char_table[c & 0x7F];
if ( c >= 16 )
break;
pad = ( pad << 4 ) | c;
if ( pad & 0x100 )
{
buffer[w++] = (FT_Byte)pad;
pad = 0x01;
}
}
if ( pad != 0x01 )
buffer[w++] = (FT_Byte)( pad << 4 );
*cursor = p + r;
return w;
#else /* 0 */
for ( r = 0; r < n; r++ )
{
FT_Char c;
if ( IS_PS_SPACE( *p ) )
continue;
if ( *p OP 0x80 )
break;
c = ft_char_table[*p & 0x7F];
if ( (unsigned)c >= 16 )
break;
if ( r & 1 )
{
*buffer = (FT_Byte)(*buffer + c);
buffer++;
}
else
*buffer = (FT_Byte)(c << 4);
r++;
}
*cursor = p;
return ( r + 1 ) / 2;
#endif /* 0 */
}
FT_LOCAL_DEF( FT_UInt )
PS_Conv_EexecDecode( FT_Byte** cursor,
FT_Byte* limit,
FT_Byte* buffer,
FT_Offset n,
FT_UShort* seed )
{
FT_Byte* p;
FT_UInt r;
FT_UInt s = *seed;
#if 1
p = *cursor;
if ( p >= limit )
return 0;
if ( n > (FT_UInt)(limit - p) )
n = (FT_UInt)(limit - p);
for ( r = 0; r < n; r++ )
{
FT_UInt val = p[r];
FT_UInt b = ( val ^ ( s >> 8 ) );
s = ( (val + s)*52845U + 22719 ) & 0xFFFFU;
buffer[r] = (FT_Byte) b;
}
*cursor = p + n;
*seed = (FT_UShort)s;
#else /* 0 */
for ( r = 0, p = *cursor; r < n && p < limit; r++, p++ )
{
FT_Byte b = (FT_Byte)( *p ^ ( s >> 8 ) );
s = (FT_UShort)( ( *p + s ) * 52845U + 22719 );
*buffer++ = b;
}
*cursor = p;
*seed = s;
#endif /* 0 */
return r;
}
/* END */