ref: 91e52d416aedfdfcf5b4331c2156a3866898738e
dir: /src/cff/t2parse.c/
#include <t2parse.h>
#include <freetype/fterrors.h>
#define T2_Err_Stack_Underflow FT_Err_Invalid_Argument
#define T2_Err_Syntax_Error FT_Err_Invalid_Argument
enum
{
t2_kind_none = 0,
t2_kind_num,
t2_kind_fixed,
t2_kind_string,
t2_kind_bool,
t2_kind_delta,
t2_kind_callback,
t2_kind_max /* do not remove */
};
/* now generate handlers for the most simple fields */
typedef FT_Error (*T2_Field_Reader)( T2_Parser* parser );
typedef struct T2_Field_Handler_
{
int kind;
int code;
FT_UInt offset;
FT_Byte size;
T2_Field_Reader reader;
FT_UInt array_max;
FT_UInt count_offset;
} T2_Field_Handler;
LOCAL_FUNC
void T2_Parser_Init( T2_Parser* parser, FT_UInt code, void* object )
{
MEM_Set(parser,0,sizeof(*parser));
parser->top = parser->stack;
parser->object_code = code;
parser->object = object;
}
/* reads an integer */
static
FT_Long parse_t2_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_Long)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;
}
/* reads a real */
static
FT_Fixed parse_t2_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_Byte nib;
FT_Byte phase;
result = 0;
num = 0;
divider = 1;
/* first of all, read the integer part */
phase = 4;
p--;
for (;;)
{
/* read one nibble at a time */
if (phase && ++p >= limit) goto Bad;
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 (;;)
{
/* read one nibble at a time */
if (!phase && ++p >= limit) goto Bad;
phase = 4-phase;
nib = (p[0] >> phase) & 0xF;
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 (;;)
{
/* read one nibble at a time */
if (!phase && ++p >= limit) goto Bad;
phase = 4-phase;
nib = (p[0] >> phase) & 0xF;
if (nib >= 10)
break;
exp = exp*10 + nib;
}
if (exp_sign)
exp = -exp;
power_ten += 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++;
}
if (num)
result += FT_DivFix( num, divider );
if (sign)
result = -result;
Exit:
return result;
Bad:
result = 0;
goto Exit;
}
/* reads a number, either integer or real */
static
FT_Long t2_parse_num( FT_Byte** d )
{
return ( **d == 30 ? (parse_t2_real ( d[0], d[1], 0 ) >> 16):
parse_t2_integer( d[0], d[1] ) );
}
/* reads a floating point number, either integer or real */
static
FT_Fixed t2_parse_fixed( FT_Byte** d )
{
return ( **d == 30 ? parse_t2_real( d[0], d[1], 0 ) :
parse_t2_integer( d[0], d[1] ) << 16 );
}
static
FT_Error parse_font_matrix( T2_Parser* parser )
{
CFF_Top_Dict* dict = (CFF_Top_Dict*)parser->object;
FT_Matrix* matrix = &dict->font_matrix;
FT_Byte** data = parser->stack;
FT_Error error;
error = T2_Err_Stack_Underflow;
if (parser->top >= parser->stack + 4)
{
matrix->xx = t2_parse_fixed( data++ );
matrix->yx = t2_parse_fixed( data++ );
matrix->xy = t2_parse_fixed( data++ );
matrix->yy = t2_parse_fixed( data );
error = 0;
}
return error;
}
static
FT_Error parse_font_bbox( T2_Parser* parser )
{
CFF_Top_Dict* dict = (CFF_Top_Dict*)parser->object;
FT_BBox* bbox = &dict->font_bbox;
FT_Byte** data = parser->stack;
FT_Error error;
error = T2_Err_Stack_Underflow;
if (parser->top >= parser->stack + 4)
{
bbox->xMin = t2_parse_fixed( data++ );
bbox->yMin = t2_parse_fixed( data++ );
bbox->xMax = t2_parse_fixed( data++ );
bbox->yMax = t2_parse_fixed( data );
error = 0;
}
return error;
}
static
FT_Error parse_private_dict( T2_Parser* parser )
{
CFF_Top_Dict* dict = (CFF_Top_Dict*)parser->object;
FT_Byte** data = parser->stack;
FT_Error error;
error = T2_Err_Stack_Underflow;
if (parser->top >= parser->stack + 2)
{
dict->private_offset = t2_parse_num( data++ );
dict->private_size = t2_parse_num( data );
error = 0;
}
return error;
}
static
FT_Error parse_cid_ros( T2_Parser* parser )
{
CFF_Top_Dict* dict = (CFF_Top_Dict*)parser->object;
FT_Byte** data = parser->stack;
FT_Error error;
error = T2_Err_Stack_Underflow;
if (parser->top >= parser->stack + 3)
{
dict->cid_registry = (FT_UInt)t2_parse_num( data++ );
dict->cid_ordering = (FT_UInt)t2_parse_num( data++ );
dict->cid_supplement = (FT_ULong)t2_parse_num( data );
error = 0;
}
return error;
}
#define T2_FIELD_NUM(code,name) T2_FIELD( code, name, t2_kind_num )
#define T2_FIELD_FIXED(code,name) T2_FIELD( code, name, t2_kind_fixed )
#define T2_FIELD_STRING(code,name) T2_FIELD( code, name, t2_kind_string )
#define T2_FIELD_BOOL(code,name) T2_FIELD( code, name, t2_kind_bool )
#define T2_FIELD_DELTA(code,name,max) T2_FIELD( code, name, t2_kind_delta )
#define T2_REF(s,f) (((s*)0)->f)
#define T2_FIELD_CALLBACK( code, name ) \
{ t2_kind_callback, code, 0, 0, parse_ ## name, 0, 0 },
#undef T2_FIELD
#define T2_FIELD( code, name, kind ) \
{ kind, code | T2CODE, \
(FT_UInt)(char*)&T2_REF( T2TYPE, name ), \
sizeof( T2_REF( T2TYPE, name ) ), \
0 },
#undef T2_FIELD_DELTA
#define T2_FIELD_DELTA( code, name, max ) \
{ t2_kind_delta, code | T2CODE, \
(FT_UInt)(char*)&T2_REF( T2TYPE, name ), \
sizeof( T2_REF( T2TYPE, name ) ), \
0, \
max, (FT_UInt)(char*)&T2_REF( T2TYPE, num_ ## name ) },
#define T2CODE_TOPDICT 0x1000
#define T2CODE_PRIVATE 0x2000
static const T2_Field_Handler t2_field_handlers[] =
{
#include <t2tokens.h>
{ 0, 0, 0, 0, 0, 0, 0 }
};
LOCAL_FUNC
FT_Error T2_Parser_Run( T2_Parser* parser,
FT_Byte* start,
FT_Byte* limit )
{
FT_Byte* p = start;
FT_Error error = 0;
parser->top = parser->stack;
parser->start = start;
parser->limit = limit;
parser->cursor = start;
while (p < limit)
{
FT_Byte v = *p;
if ( v >= 27 || v != 31 )
{
/* its a number, we'll push its position on the stack */
if (parser->top - parser->stack >= T2_MAX_STACK_DEPTH)
goto Stack_Overflow;
*parser->top ++ = p;
/* now, skip it */
if (v == 30)
{
/* skip real number */
for (;;)
{
if (p >= limit) goto Syntax_Error;
v = p[0] >> 4;
if (v == 15) break;
v = p[0] & 0xF;
if (v == 15) break;
p++;
}
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_Int num_args = parser->top - parser->stack;
const T2_Field_Handler* field;
/* first of all, a trivial check */
if ( num_args < 1 ) goto Stack_Underflow;
code = v;
if (v == 12)
{
/* two byte operator */
p++;
code = 0x100 | p[0];
}
code = code | parser->object_code;
for ( field = t2_field_handlers; field->kind; field++ )
{
if (field->code == code)
{
/* we found our field's handler, read it.. */
FT_Long val;
FT_Byte* q = (FT_Byte*)parser->object + field->offset;
switch (field->kind)
{
case t2_kind_bool:
case t2_kind_string:
case t2_kind_num:
val = t2_parse_num( parser->stack );
goto Store_Number;
case t2_kind_fixed:
val = t2_parse_fixed( parser->stack );
Store_Number:
switch (field->size)
{
case 1: *(FT_Byte*) q = (FT_Byte)val; break;
case 2: *(FT_Short*)q = (FT_Short)val; break;
default: *(FT_Long*)q = val;
}
break;
case t2_kind_delta:
{
FT_Byte* qcount = (FT_Byte*)parser->object +
field->count_offset;
FT_Long val;
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 += t2_parse_num( data++ );
switch (field->size)
{
case 1: *(FT_Byte*) q = (FT_Byte)val; break;
case 2: *(FT_Short*)q = (FT_Short)val; break;
default: *(FT_Long*)q = val;
}
q += field->size;
num_args--;
}
}
break;
default: /* callback */
error = field->reader( parser );
if (error) goto Exit;
}
/* clear stack */
parser->top = parser->stack;
}
goto Found; /* exit loop */
}
/* 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 = FT_Err_Invalid_Argument;
goto Exit;
Stack_Underflow:
error = FT_Err_Invalid_Argument;
goto Exit;
Syntax_Error:
error = FT_Err_Invalid_Argument;
goto Exit;
}