ref: 5dc8aba72bf072ad5000c26d974d86bcc95aaa92
dir: /src/type1z/t1parse.c/
/*******************************************************************
*
* t1parse.c 2.0
*
* Type1 parser.
*
* Copyright 1996-1998 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.
*
* The Type 1 parser is in charge of the following:
*
* - provide an implementation of a growing sequence of
* objects called a T1_Table (used to build various tables
* needed by the loader).
*
* - opening .pfb and .pfa files to extract their top-level
* and private dictionaries
*
* - read numbers, arrays & strings from any dictionary
*
* See "t1load.c" to see how data is loaded from the font file
*
******************************************************************/
#include <ftdebug.h>
#include <ftcalc.h>
#include <ftobjs.h>
#include <ftstream.h>
#include <t1errors.h>
#include <t1parse.h>
#undef FT_COMPONENT
#define FT_COMPONENT trace_t1load
/*************************************************************************/
/* */
/* <Function> T1_New_Table */
/* */
/* <Description> */
/* Initialise a T1_Table. */
/* */
/* <Input> */
/* table :: address of target table */
/* count :: table size = maximum number of elements */
/* memory :: memory object to use for all subsequent reallocations */
/* */
/* <Return> */
/* Error code. 0 means success */
/* */
LOCAL_FUNC
T1_Error T1_New_Table( T1_Table* table,
T1_Int count,
FT_Memory memory )
{
T1_Error error;
table->memory = memory;
if ( ALLOC_ARRAY( table->elements, count, T1_Byte* ) ||
ALLOC_ARRAY( table->lengths, count, T1_Byte* ) )
goto Exit;
table->max_elems = count;
table->init = 0xdeadbeef;
table->num_elems = 0;
table->block = 0;
table->capacity = 0;
table->cursor = 0;
Exit:
if (error) FREE(table->elements);
return error;
}
/*************************************************************************/
/* */
/* <Function> T1_Add_Table */
/* */
/* <Description> */
/* Adds an object to a T1_Table, possibly growing its memory block */
/* */
/* <Input> */
/* table :: target table */
/* index :: index of object in table */
/* object :: address of object to copy in memory */
/* length :: length in bytes of source object */
/* */
/* <Return> */
/* Error code. 0 means success. An error is returned when a */
/* realloc failed.. */
/* */
static void shift_elements( T1_Table* table, T1_Byte* old_base )
{
T1_Long delta = table->block - old_base;
T1_Byte** offset = table->elements;
T1_Byte** limit = offset + table->max_elems;
if (delta)
for ( ; offset < limit; offset++ )
{
if (offset[0])
offset[0] += delta;
}
}
static
T1_Error reallocate_t1_table( T1_Table* table,
T1_Int new_size )
{
FT_Memory memory = table->memory;
T1_Byte* old_base = table->block;
T1_Error error;
/* realloc the base block */
if ( REALLOC( table->block, table->capacity, new_size ) )
return error;
table->capacity = new_size;
/* shift all offsets when needed */
if (old_base)
shift_elements( table, old_base );
return T1_Err_Ok;
}
LOCAL_FUNC
T1_Error T1_Add_Table( T1_Table* table,
T1_Int index,
void* object,
T1_Int length )
{
if (index < 0 || index > table->max_elems)
{
FT_ERROR(( "T1.Add_Table: invalid index\n" ));
return T1_Err_Syntax_Error;
}
/* grow the base block if needed */
if ( table->cursor + length > table->capacity )
{
T1_Error error;
T1_Int new_size = table->capacity;
while ( new_size < table->cursor+length )
new_size += 1024;
error = reallocate_t1_table( table, new_size );
if (error) return error;
}
/* add the object to the base block and adjust offset */
table->elements[ index ] = table->block + table->cursor;
table->lengths [ index ] = length;
MEM_Copy( table->block + table->cursor, object, length );
table->cursor += length;
return T1_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> T1_Done_Table */
/* */
/* <Description> */
/* Finalise a T1_Table. (realloc it to its current cursor). */
/* */
/* <Input> */
/* table :: target table */
/* */
/* <Note> */
/* This function does NOT release the heap's memory block. It is up */
/* to the caller to clean it, or reference it in its own structures. */
/* */
LOCAL_FUNC
void T1_Done_Table( T1_Table* table )
{
FT_Memory memory = table->memory;
T1_Error error;
T1_Byte* old_base;
/* should never fail, as rec.cursor <= rec.size */
old_base = table->block;
if (!old_base)
return;
(void)REALLOC( table->block, table->capacity, table->cursor );
table->capacity = table->cursor;
if (old_base != table->block)
shift_elements( table, old_base );
}
LOCAL_FUNC
void T1_Release_Table( T1_Table* table )
{
FT_Memory memory = table->memory;
if (table->init == 0xdeadbeef)
{
FREE( table->block );
FREE( table->elements );
FREE( table->lengths );
table->init = 0;
}
}
static
T1_Long t1_toint( T1_Byte* *cursor,
T1_Byte* limit )
{
T1_Long result = 0;
T1_Byte* cur = *cursor;
T1_Byte c, d;
for (; cur < limit; cur++)
{
c = *cur;
d = (T1_Byte)(c - '0');
if (d < 10) break;
if ( c=='-' )
{
cur++;
break;
}
}
if (cur < limit)
{
do
{
d = (T1_Byte)(cur[0] - '0');
if (d >= 10)
break;
result = result*10 + d;
cur++;
} while (cur < limit);
if (c == '-')
result = -result;
}
*cursor = cur;
return result;
}
static
T1_Long t1_tofixed( T1_Byte* *cursor,
T1_Byte* limit,
T1_Long power_ten )
{
T1_Byte* cur = *cursor;
T1_Long num, divider, result;
T1_Int sign = 0;
T1_Byte d;
if (cur >= limit) return 0;
/* first of all, read the integer part */
result = t1_toint( &cur, limit ) << 16;
num = 0;
divider = 1;
if (result < 0)
{
sign = 1;
result = -result;
}
if (cur >= limit) goto Exit;
/* read decimal part, if any */
if (*cur == '.' && cur+1 < limit)
{
cur++;
for (;;)
{
d = (T1_Byte)(*cur - '0');
if (d >= 10) break;
if (divider < 10000000L)
{
num = num*10 + d;
divider *= 10;
}
cur++;
if (cur >= limit) break;
}
}
/* read exponent, if any */
if ( cur+1 < limit && (*cur == 'e' || *cur == 'E'))
{
cur++;
power_ten += t1_toint( &cur, limit );
}
Exit:
/* 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;
*cursor = cur;
return result;
}
static
T1_Int t1_tocoordarray( T1_Byte* *cursor,
T1_Byte* limit,
T1_Int max_coords,
T1_Short* coords )
{
T1_Byte* cur = *cursor;
T1_Int count = 0;
T1_Byte c, ender;
if (cur >= limit) goto Exit;
/* check for the beginning of an array. If not, only one number will be read */
c = *cur;
ender = 0;
if (c == '[')
ender = ']';
if (c == '{')
ender = '}';
if (ender)
cur++;
/* now, read the coordinates */
for ( ; cur < limit; cur++ )
{
c = *cur;
if (count >= max_coords || c == ender)
break;
coords[count] = (T1_Short)(t1_tofixed(&cur,limit,0) >> 16);
count++;
if (!ender)
break;
}
Exit:
*cursor = cur;
return count;
}
static
T1_Int t1_tofixedarray( T1_Byte* *cursor,
T1_Byte* limit,
T1_Int max_values,
T1_Fixed* values,
T1_Int power_ten )
{
T1_Byte* cur = *cursor;
T1_Int count = 0;
T1_Byte c, ender;
if (cur >= limit) goto Exit;
/* check for the beginning of an array. If not, only one number will be read */
c = *cur;
ender = 0;
if (c == '[')
ender = ']';
if (c == '{')
ender = '}';
if (ender)
cur++;
/* now, read the values */
for ( ; cur < limit; cur++ )
{
c = *cur;
if (count >= max_values || c == ender)
break;
values[count] = t1_tofixed(&cur,limit,power_ten);
count++;
if (!ender)
break;
}
Exit:
*cursor = cur;
return count;
}
static
T1_String* t1_tostring( T1_Byte* *cursor, T1_Byte* limit, FT_Memory memory )
{
T1_Byte* cur = *cursor;
T1_Int len = 0;
T1_Int count;
T1_String* result;
FT_Error error;
/* first of all, skip everything until we encounter a string */
while ( cur < limit && *cur != '(' ) cur++;
cur++;
if (cur >= limit) return 0;
*cursor = cur;
count = 0;
/* then, count its length */
for ( ; cur < limit; cur++ )
{
if (*cur == '(')
count++;
else if (*cur == ')')
{
count--;
if (count < 0)
break;
}
}
len = cur - *cursor;
if (cur >= limit || ALLOC(result,len+1)) return 0;
/* now copy the string */
MEM_Copy( result, *cursor, len );
result[len] = '\0';
return result;
}
static
int t1_tobool( T1_Byte* *cursor, T1_Byte* limit )
{
T1_Byte* cur = *cursor;
T1_Bool result = 0;
/* return 1 if we find a "true", 0 otherwise */
if ( cur+3 < limit &&
cur[0] == 't' &&
cur[1] == 'r' &&
cur[2] == 'u' &&
cur[3] == 'e' )
{
result = 1;
cur += 5;
}
else if ( cur+4 < limit &&
cur[0] == 'f' &&
cur[1] == 'a' &&
cur[2] == 'l' &&
cur[3] == 's' &&
cur[4] == 'e' )
{
result = 0;
cur += 6;
}
*cursor = cur;
return result;
}
LOCAL_FUNC
T1_Long T1_ToInt ( T1_Parser* parser )
{
return t1_toint( &parser->cursor, parser->limit );
}
LOCAL_FUNC
T1_Long T1_ToFixed( T1_Parser* parser, T1_Int power_ten )
{
return t1_tofixed( &parser->cursor, parser->limit, power_ten );
}
LOCAL_FUNC
T1_Int T1_ToCoordArray( T1_Parser* parser,
T1_Int max_coords,
T1_Short* coords )
{
return t1_tocoordarray( &parser->cursor, parser->limit, max_coords, coords );
}
LOCAL_FUNC
T1_Int T1_ToFixedArray( T1_Parser* parser,
T1_Int max_values,
T1_Fixed* values,
T1_Int power_ten )
{
return t1_tofixedarray( &parser->cursor, parser->limit, max_values, values, power_ten );
}
LOCAL_FUNC
T1_String* T1_ToString( T1_Parser* parser )
{
return t1_tostring( &parser->cursor, parser->limit, parser->memory );
}
LOCAL_FUNC
T1_Bool T1_ToBool( T1_Parser* parser )
{
return t1_tobool( &parser->cursor, parser->limit );
}
static
FT_Error read_pfb_tag( FT_Stream stream, T1_UShort *tag, T1_Long* size )
{
FT_Error error;
if (READ_UShort(*tag)) goto Exit;
if (*tag == 0x8001 || *tag == 0x8002)
{
FT_Long asize;
if (READ_ULong(asize)) goto Exit;
/* swap between big and little endianness */
*size = ((asize & 0xFF000000) >> 24) |
((asize & 0x00FF0000) >> 8 ) |
((asize & 0x0000FF00) << 8 ) |
((asize & 0x000000FF) << 24);
}
Exit:
return error;
}
LOCAL_FUNC
T1_Error T1_New_Parser( T1_Parser* parser,
FT_Stream stream,
FT_Memory memory )
{
FT_Error error;
T1_UShort tag;
T1_Long size;
parser->stream = stream;
parser->memory = memory;
parser->base_len = 0;
parser->base_dict = 0;
parser->private_len = 0;
parser->private_dict = 0;
parser->in_pfb = 0;
parser->in_memory = 0;
parser->single_block = 0;
parser->cursor = 0;
parser->limit = 0;
/******************************************************************/
/* */
/* Here's a short summary of what is going on : */
/* */
/* When creating a new Type 1 parser, we try to locate and */
/* load the base dictionary when this is possible (i.e. for */
/* .pfb files). Otherwise, we load the whole font in memory. */
/* */
/* When "loading" the base dictionary, we only setup pointers */
/* in the case of a memory-based stream. Otherwise, we allocate */
/* and load the base dict in it. */
/* */
/* parser->in_pfb is set when we are in a binary (".pfb") font */
/* parser->in_memory is set when we have a memory stream. */
/* */
/* try to compute the size of the base dictionary */
/* look for a Postscript binary file tag, i.e 0x8001 */
if ( FILE_Seek(0L) )
goto Exit;
error = read_pfb_tag( stream, &tag, &size );
if (error) goto Exit;
if (tag != 0x8001)
{
/* assume that this is a PFA file for now, an error will */
/* be produced later when more things are checked */
(void)FILE_Seek(0L);
size = stream->size;
}
else
parser->in_pfb = 1;
/* now, try to load the "size" bytes of the "base" dictionary we */
/* found previously */
/* if it's a memory-based resource, set up pointers */
if ( !stream->read )
{
parser->base_dict = (T1_Byte*)stream->base + stream->pos;
parser->base_len = size;
parser->in_memory = 1;
/* check that the "size" field is valid */
if ( FILE_Skip(size) ) goto Exit;
}
else
{
/* read segment in memory */
if ( ALLOC( parser->base_dict, size ) ||
FILE_Read( parser->base_dict, size ) )
goto Exit;
}
/* Now check font format, we must see a '%!PS-AdobeFont-1' */
/* or a '%!FontType' */
{
if ( size <= 16 ||
( strncmp( (const char*)parser->base_dict, "%!PS-AdobeFont-1", 16 ) &&
strncmp( (const char*)parser->base_dict, "%!FontType", 10 ) ) )
{
FT_TRACE2(( "Not a Type1 font\n" ));
error = T1_Err_Invalid_File_Format;
}
else
{
parser->cursor = parser->base_dict;
parser->limit = parser->cursor + parser->base_len;
}
}
Exit:
if (error && !parser->in_memory)
FREE( parser->base_dict );
return error;
}
LOCAL_FUNC
void T1_Done_Parser( T1_Parser* parser )
{
FT_Memory memory = parser->memory;
/* always free the private dictionary */
FREE( parser->private_dict );
/* free the base dictionary only when we have a disk stream */
if (!parser->in_memory)
FREE( parser->base_dict );
}
/* return the value of an hexadecimal digit */
static
int hexa_value( char c )
{
unsigned int d;
d = (unsigned int)(c-'0');
if ( d <= 9 ) return (int)d;
d = (unsigned int)(c-'a');
if ( d <= 5 ) return (int)(d+10);
d = (unsigned int)(c-'A');
if ( d <= 5 ) return (int)(d+10);
return -1;
}
LOCAL_FUNC
void T1_Decrypt( T1_Byte* buffer,
T1_Int length,
T1_UShort seed )
{
while ( length > 0 )
{
T1_Byte plain;
plain = (*buffer ^ (seed >> 8));
seed = (*buffer+seed)*52845+22719;
*buffer++ = plain;
length--;
}
}
LOCAL_FUNC
T1_Error T1_Get_Private_Dict( T1_Parser* parser )
{
FT_Stream stream = parser->stream;
FT_Memory memory = parser->memory;
FT_Error error = 0;
T1_Long size;
if (parser->in_pfb)
{
/* in the case of the PFB format, the private dictionary can be */
/* made of several segments. We thus first read the number of */
/* segments to compute the total size of the private dictionary */
/* then re-read them into memory.. */
T1_Long start_pos = FILE_Pos();
T1_UShort tag;
T1_Long size;
parser->private_len = 0;
for (;;)
{
error = read_pfb_tag(stream, &tag, &size);
if (error) goto Fail;
if (tag != 0x8002)
break;
parser->private_len += size;
if ( FILE_Skip(size) )
goto Fail;
}
/* Check that we have a private dictionary there */
/* and allocate private dictionary buffer */
if ( parser->private_len == 0 )
{
FT_ERROR(( "T1.Open_Private: invalid private dictionary section\n" ));
error = T1_Err_Invalid_File_Format;
goto Fail;
}
if ( FILE_Seek( start_pos ) ||
ALLOC( parser->private_dict, parser->private_len ) )
goto Fail;
parser->private_len = 0;
for (;;)
{
error = read_pfb_tag( stream, &tag, &size );
if (error || tag != 0x8002) { error = 0; break; }
if ( FILE_Read( parser->private_dict + parser->private_len, size ) )
goto Fail;
parser->private_len += size;
}
}
else
{
/* we have already "loaded" the whole PFA font file in memory */
/* if this is a memory resource, allocate a new block to hold */
/* the private dict. Otherwise, simply overwrite into the */
/* base dict block in the heap.. */
/* first of all, look at the "eexec" keyword */
FT_Byte* cur = parser->base_dict;
FT_Byte* limit = cur + parser->base_len;
FT_Byte c;
for (;;)
{
c = cur[0];
if (c == 'e' && cur+9 < limit) /* 9 = 5 letters for 'eexec' + newline + 4 chars */
{
if ( cur[1] == 'e' && cur[2] == 'x' &&
cur[3] == 'e' && cur[4] == 'c' )
{
cur += 6; /* we skip the newling after the "eexec" */
break;
}
}
cur++;
if (cur >= limit)
{
FT_ERROR(("T1.Open_Private: could not find 'eexec' keyword\n"));
error = FT_Err_Invalid_File_Format;
goto Exit;
}
}
/* now determine wether where to write the _encrypted_ binary private */
/* dictionary. We overwrite the base dictionary for disk-based resources */
/* and allocate a new block otherwise */
size = parser->base_len - (cur-parser->base_dict);
if ( parser->in_memory )
{
/* note that we allocate one more byte to put a terminating '0' */
if (ALLOC( parser->private_dict, size+1 )) goto Fail;
parser->private_len = size;
}
else
{
parser->single_block = 1;
parser->private_dict = parser->base_dict;
parser->private_len = size;
parser->base_dict = 0;
parser->base_len = 0;
}
/* now determine wether the private dictionary is encoded in binary */
/* or hexadecimal ASCII format.. */
/* and decode it accordingly */
/* we need to access the next 4 bytes (after the final \r following */
/* the 'eexec' keyword..) if they all are hexadecimal digits, then */
/*we have a case of ASCII storage.. */
if ( ( hexa_value( cur[0] ) | hexa_value( cur[1] ) |
hexa_value( cur[2] ) | hexa_value( cur[3] ) ) < 0 )
{
/* binary encoding - "simply" copy the private dict */
MEM_Copy( parser->private_dict, cur, size );
}
else
{
/* ASCII hexadecimal encoding.. This blows goats !!.. */
T1_Byte* write;
T1_Int count;
write = parser->private_dict;
count = 0;
for ( ;cur < limit; cur++)
{
int hex1;
/* check for newline */
if (cur[0] == '\r' || cur[0] == '\n')
continue;
/* exit if we have a non-hexadecimal digit that isn't a newline */
hex1 = hexa_value(cur[0]);
if (hex1 < 0 || cur+1 >= limit)
break;
/* otherwise, store byte */
*write++ = (hex1 << 4) | hexa_value(cur[1]);
count++;
cur++;
}
/* put a safeguard */
parser->private_len = write - parser->private_dict;
*write++ = 0;
}
}
/* we now decrypt the encoded binary private dictionary */
T1_Decrypt( parser->private_dict, parser->private_len, 55665 );
parser->cursor = parser->private_dict;
parser->limit = parser->cursor + parser->private_len;
Fail:
Exit:
return error;
}