diff options
Diffstat (limited to 'nx-X11/extras/freetype2/src/cff/cffparse.c')
-rw-r--r-- | nx-X11/extras/freetype2/src/cff/cffparse.c | 688 |
1 files changed, 688 insertions, 0 deletions
diff --git a/nx-X11/extras/freetype2/src/cff/cffparse.c b/nx-X11/extras/freetype2/src/cff/cffparse.c new file mode 100644 index 000000000..8f1a98c55 --- /dev/null +++ b/nx-X11/extras/freetype2/src/cff/cffparse.c @@ -0,0 +1,688 @@ +/***************************************************************************/ +/* */ +/* cffparse.c */ +/* */ +/* CFF token stream parser (body) */ +/* */ +/* Copyright 1996-2001, 2002, 2003, 2004 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 <ft2build.h> +#include "cffparse.h" +#include FT_INTERNAL_STREAM_H + +#include "cfferrs.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 trace_cffparse + + + enum + { + cff_kind_none = 0, + cff_kind_num, + cff_kind_fixed, + cff_kind_fixed_thousand, + cff_kind_string, + cff_kind_bool, + cff_kind_delta, + cff_kind_callback, + + cff_kind_max /* do not remove */ + }; + + + /* now generate handlers for the most simple fields */ + typedef FT_Error (*CFF_Field_Reader)( CFF_Parser parser ); + + typedef struct CFF_Field_Handler_ + { + int kind; + int code; + FT_UInt offset; + FT_Byte size; + CFF_Field_Reader reader; + FT_UInt array_max; + FT_UInt count_offset; + + } CFF_Field_Handler; + + + FT_LOCAL_DEF( void ) + cff_parser_init( CFF_Parser parser, + FT_UInt code, + void* object ) + { + FT_MEM_ZERO( parser, sizeof ( *parser ) ); + + parser->top = parser->stack; + parser->object_code = code; + parser->object = object; + } + + + /* read an integer */ + static FT_Long + cff_parse_integer( FT_Byte* start, + FT_Byte* limit ) + { + FT_Byte* p = start; + FT_Int v = *p++; + FT_Long val = 0; + + + if ( v == 28 ) + { + if ( p + 2 > limit ) + goto Bad; + + val = (FT_Short)( ( (FT_Int)p[0] << 8 ) | p[1] ); + p += 2; + } + else if ( v == 29 ) + { + if ( p + 4 > limit ) + goto Bad; + + val = ( (FT_Long)p[0] << 24 ) | + ( (FT_Long)p[1] << 16 ) | + ( (FT_Long)p[2] << 8 ) | + p[3]; + p += 4; + } + else if ( v < 247 ) + { + val = v - 139; + } + else if ( v < 251 ) + { + if ( p + 1 > limit ) + goto Bad; + + val = ( v - 247 ) * 256 + p[0] + 108; + p++; + } + else + { + if ( p + 1 > limit ) + goto Bad; + + val = -( v - 251 ) * 256 - p[0] - 108; + p++; + } + + Exit: + return val; + + Bad: + val = 0; + goto Exit; + } + + + /* read a real */ + static FT_Fixed + cff_parse_real( FT_Byte* start, + FT_Byte* limit, + FT_Int power_ten ) + { + FT_Byte* p = start; + FT_Long num, divider, result, exp; + FT_Int sign = 0, exp_sign = 0; + FT_UInt nib; + FT_UInt phase; + + + result = 0; + num = 0; + divider = 1; + + /* first of all, read the integer part */ + phase = 4; + + for (;;) + { + /* If we entered this iteration with phase == 4, we need to */ + /* read a new byte. This also skips past the intial 0x1E. */ + if ( phase ) + { + p++; + + /* Make sure we don't read past the end. */ + if ( p >= limit ) + goto Bad; + } + + /* Get the nibble. */ + nib = ( p[0] >> phase ) & 0xF; + phase = 4 - phase; + + if ( nib == 0xE ) + sign = 1; + else if ( nib > 9 ) + break; + else + result = result * 10 + nib; + } + + /* read decimal part, if any */ + if ( nib == 0xa ) + for (;;) + { + /* If we entered this iteration with phase == 4, we need */ + /* to read a new byte. */ + if ( phase ) + { + p++; + + /* Make sure we don't read past the end. */ + if ( p >= limit ) + goto Bad; + } + + /* Get the nibble. */ + nib = ( p[0] >> phase ) & 0xF; + phase = 4 - phase; + if ( nib >= 10 ) + break; + + if ( divider < 10000000L ) + { + num = num * 10 + nib; + divider *= 10; + } + } + + /* read exponent, if any */ + if ( nib == 12 ) + { + exp_sign = 1; + nib = 11; + } + + if ( nib == 11 ) + { + exp = 0; + + for (;;) + { + /* If we entered this iteration with phase == 4, we need */ + /* to read a new byte. */ + if ( phase ) + { + p++; + + /* Make sure we don't read past the end. */ + if ( p >= limit ) + goto Bad; + } + + /* Get the nibble. */ + nib = ( p[0] >> phase ) & 0xF; + phase = 4 - phase; + if ( nib >= 10 ) + break; + + exp = exp * 10 + nib; + } + + if ( exp_sign ) + exp = -exp; + + power_ten += (FT_Int)exp; + } + + /* raise to power of ten if needed */ + while ( power_ten > 0 ) + { + result = result * 10; + num = num * 10; + + power_ten--; + } + + while ( power_ten < 0 ) + { + result = result / 10; + divider = divider * 10; + + power_ten++; + } + + /* Move the integer part into the high 16 bits. */ + result <<= 16; + + /* Place the decimal part into the low 16 bits. */ + if ( num ) + result |= FT_DivFix( num, divider ); + + if ( sign ) + result = -result; + + Exit: + return result; + + Bad: + result = 0; + goto Exit; + } + + + /* read a number, either integer or real */ + static FT_Long + cff_parse_num( FT_Byte** d ) + { + return ( **d == 30 ? ( cff_parse_real ( d[0], d[1], 0 ) >> 16 ) + : cff_parse_integer( d[0], d[1] ) ); + } + + + /* read a floating point number, either integer or real */ + static FT_Fixed + cff_parse_fixed( FT_Byte** d ) + { + return ( **d == 30 ? cff_parse_real ( d[0], d[1], 0 ) + : cff_parse_integer( d[0], d[1] ) << 16 ); + } + + /* read a floating point number, either integer or real, */ + /* but return 1000 times the number read in. */ + static FT_Fixed + cff_parse_fixed_thousand( FT_Byte** d ) + { + return **d == + 30 ? cff_parse_real ( d[0], d[1], 3 ) + : (FT_Fixed)FT_MulFix( cff_parse_integer( d[0], d[1] ) << 16, 1000 ); + } + + static FT_Error + cff_parse_font_matrix( CFF_Parser parser ) + { + CFF_FontRecDict dict = (CFF_FontRecDict)parser->object; + FT_Matrix* matrix = &dict->font_matrix; + FT_Vector* offset = &dict->font_offset; + FT_UShort* upm = &dict->units_per_em; + FT_Byte** data = parser->stack; + FT_Error error; + FT_Fixed temp; + + + error = CFF_Err_Stack_Underflow; + + if ( parser->top >= parser->stack + 6 ) + { + matrix->xx = cff_parse_fixed_thousand( data++ ); + matrix->yx = cff_parse_fixed_thousand( data++ ); + matrix->xy = cff_parse_fixed_thousand( data++ ); + matrix->yy = cff_parse_fixed_thousand( data++ ); + offset->x = cff_parse_fixed_thousand( data++ ); + offset->y = cff_parse_fixed_thousand( data ); + + temp = FT_ABS( matrix->yy ); + + *upm = (FT_UShort)FT_DivFix( 0x10000L, FT_DivFix( temp, 1000 ) ); + + if ( temp != 0x10000L ) + { + matrix->xx = FT_DivFix( matrix->xx, temp ); + matrix->yx = FT_DivFix( matrix->yx, temp ); + matrix->xy = FT_DivFix( matrix->xy, temp ); + matrix->yy = FT_DivFix( matrix->yy, temp ); + offset->x = FT_DivFix( offset->x, temp ); + offset->y = FT_DivFix( offset->y, temp ); + } + + /* note that the offsets must be expressed in integer font units */ + offset->x >>= 16; + offset->y >>= 16; + + error = CFF_Err_Ok; + } + + return error; + } + + + static FT_Error + cff_parse_font_bbox( CFF_Parser parser ) + { + CFF_FontRecDict dict = (CFF_FontRecDict)parser->object; + FT_BBox* bbox = &dict->font_bbox; + FT_Byte** data = parser->stack; + FT_Error error; + + + error = CFF_Err_Stack_Underflow; + + if ( parser->top >= parser->stack + 4 ) + { + bbox->xMin = FT_RoundFix( cff_parse_fixed( data++ ) ); + bbox->yMin = FT_RoundFix( cff_parse_fixed( data++ ) ); + bbox->xMax = FT_RoundFix( cff_parse_fixed( data++ ) ); + bbox->yMax = FT_RoundFix( cff_parse_fixed( data ) ); + error = CFF_Err_Ok; + } + + return error; + } + + + static FT_Error + cff_parse_private_dict( CFF_Parser parser ) + { + CFF_FontRecDict dict = (CFF_FontRecDict)parser->object; + FT_Byte** data = parser->stack; + FT_Error error; + + + error = CFF_Err_Stack_Underflow; + + if ( parser->top >= parser->stack + 2 ) + { + dict->private_size = cff_parse_num( data++ ); + dict->private_offset = cff_parse_num( data ); + error = CFF_Err_Ok; + } + + return error; + } + + + static FT_Error + cff_parse_cid_ros( CFF_Parser parser ) + { + CFF_FontRecDict dict = (CFF_FontRecDict)parser->object; + FT_Byte** data = parser->stack; + FT_Error error; + + + error = CFF_Err_Stack_Underflow; + + if ( parser->top >= parser->stack + 3 ) + { + dict->cid_registry = (FT_UInt)cff_parse_num ( data++ ); + dict->cid_ordering = (FT_UInt)cff_parse_num ( data++ ); + dict->cid_supplement = (FT_ULong)cff_parse_num( data ); + error = CFF_Err_Ok; + } + + return error; + } + + +#define CFF_FIELD_NUM( code, name ) \ + CFF_FIELD( code, name, cff_kind_num ) +#define CFF_FIELD_FIXED( code, name ) \ + CFF_FIELD( code, name, cff_kind_fixed ) +#define CFF_FIELD_FIXED_1000( code, name ) \ + CFF_FIELD( code, name, cff_kind_fixed_thousand ) +#define CFF_FIELD_STRING( code, name ) \ + CFF_FIELD( code, name, cff_kind_string ) +#define CFF_FIELD_BOOL( code, name ) \ + CFF_FIELD( code, name, cff_kind_bool ) +#define CFF_FIELD_DELTA( code, name, max ) \ + CFF_FIELD( code, name, cff_kind_delta ) + +#define CFF_FIELD_CALLBACK( code, name ) \ + { \ + cff_kind_callback, \ + code | CFFCODE, \ + 0, 0, \ + cff_parse_ ## name, \ + 0, 0 \ + }, + +#undef CFF_FIELD +#define CFF_FIELD( code, name, kind ) \ + { \ + kind, \ + code | CFFCODE, \ + FT_FIELD_OFFSET( name ), \ + FT_FIELD_SIZE( name ), \ + 0, 0, 0 \ + }, + +#undef CFF_FIELD_DELTA +#define CFF_FIELD_DELTA( code, name, max ) \ + { \ + cff_kind_delta, \ + code | CFFCODE, \ + FT_FIELD_OFFSET( name ), \ + FT_FIELD_SIZE_DELTA( name ), \ + 0, \ + max, \ + FT_FIELD_OFFSET( num_ ## name ) \ + }, + +#define CFFCODE_TOPDICT 0x1000 +#define CFFCODE_PRIVATE 0x2000 + + static const CFF_Field_Handler cff_field_handlers[] = + { + +#include "cfftoken.h" + + { 0, 0, 0, 0, 0, 0, 0 } + }; + + + FT_LOCAL_DEF( FT_Error ) + cff_parser_run( CFF_Parser parser, + FT_Byte* start, + FT_Byte* limit ) + { + FT_Byte* p = start; + FT_Error error = CFF_Err_Ok; + + + parser->top = parser->stack; + parser->start = start; + parser->limit = limit; + parser->cursor = start; + + while ( p < limit ) + { + FT_UInt v = *p; + + + if ( v >= 27 && v != 31 ) + { + /* it's a number; we will push its position on the stack */ + if ( parser->top - parser->stack >= CFF_MAX_STACK_DEPTH ) + goto Stack_Overflow; + + *parser->top ++ = p; + + /* now, skip it */ + if ( v == 30 ) + { + /* skip real number */ + p++; + for (;;) + { + if ( p >= limit ) + goto Syntax_Error; + v = p[0] >> 4; + if ( v == 15 ) + break; + v = p[0] & 0xF; + if ( v == 15 ) + break; + p++; + } + } + else if ( v == 28 ) + p += 2; + else if ( v == 29 ) + p += 4; + else if ( v > 246 ) + p += 1; + } + else + { + /* This is not a number, hence it's an operator. Compute its code */ + /* and look for it in our current list. */ + + FT_UInt code; + FT_UInt num_args = (FT_UInt) + ( parser->top - parser->stack ); + const CFF_Field_Handler* field; + + + *parser->top = p; + code = v; + if ( v == 12 ) + { + /* two byte operator */ + p++; + if ( p >= limit ) + goto Syntax_Error; + + code = 0x100 | p[0]; + } + code = code | parser->object_code; + + for ( field = cff_field_handlers; field->kind; field++ ) + { + if ( field->code == (FT_Int)code ) + { + /* we found our field's handler; read it */ + FT_Long val; + FT_Byte* q = (FT_Byte*)parser->object + field->offset; + + + /* check that we have enough arguments -- except for */ + /* delta encoded arrays, which can be empty */ + if ( field->kind != cff_kind_delta && num_args < 1 ) + goto Stack_Underflow; + + switch ( field->kind ) + { + case cff_kind_bool: + case cff_kind_string: + case cff_kind_num: + val = cff_parse_num( parser->stack ); + goto Store_Number; + + case cff_kind_fixed: + val = cff_parse_fixed( parser->stack ); + goto Store_Number; + + case cff_kind_fixed_thousand: + val = cff_parse_fixed_thousand( parser->stack ); + + Store_Number: + switch ( field->size ) + { + case (8 / FT_CHAR_BIT): + *(FT_Byte*)q = (FT_Byte)val; + break; + + case (16 / FT_CHAR_BIT): + *(FT_Short*)q = (FT_Short)val; + break; + + case (32 / FT_CHAR_BIT): + *(FT_Int32*)q = (FT_Int)val; + break; + + default: /* for 64-bit systems */ + *(FT_Long*)q = val; + } + break; + + case cff_kind_delta: + { + FT_Byte* qcount = (FT_Byte*)parser->object + + field->count_offset; + + FT_Byte** data = parser->stack; + + + if ( num_args > field->array_max ) + num_args = field->array_max; + + /* store count */ + *qcount = (FT_Byte)num_args; + + val = 0; + while ( num_args > 0 ) + { + val += cff_parse_num( data++ ); + switch ( field->size ) + { + case (8 / FT_CHAR_BIT): + *(FT_Byte*)q = (FT_Byte)val; + break; + + case (16 / FT_CHAR_BIT): + *(FT_Short*)q = (FT_Short)val; + break; + + case (32 / FT_CHAR_BIT): + *(FT_Int32*)q = (FT_Int)val; + break; + + default: /* for 64-bit systems */ + *(FT_Long*)q = val; + } + + q += field->size; + num_args--; + } + } + break; + + default: /* callback */ + error = field->reader( parser ); + if ( error ) + goto Exit; + } + goto Found; + } + } + + /* this is an unknown operator, or it is unsupported; */ + /* we will ignore it for now. */ + + Found: + /* clear stack */ + parser->top = parser->stack; + } + p++; + } + + Exit: + return error; + + Stack_Overflow: + error = CFF_Err_Invalid_Argument; + goto Exit; + + Stack_Underflow: + error = CFF_Err_Invalid_Argument; + goto Exit; + + Syntax_Error: + error = CFF_Err_Invalid_Argument; + goto Exit; + } + + +/* END */ |