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-rw-r--r--modules/freetype2/src/cid/cidload.c941
1 files changed, 941 insertions, 0 deletions
diff --git a/modules/freetype2/src/cid/cidload.c b/modules/freetype2/src/cid/cidload.c
new file mode 100644
index 0000000000..26daa5da7f
--- /dev/null
+++ b/modules/freetype2/src/cid/cidload.c
@@ -0,0 +1,941 @@
+/****************************************************************************
+ *
+ * cidload.c
+ *
+ * CID-keyed Type1 font loader (body).
+ *
+ * Copyright (C) 1996-2023 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 <freetype/internal/ftdebug.h>
+#include FT_CONFIG_CONFIG_H
+#include <freetype/ftmm.h>
+#include <freetype/internal/t1types.h>
+#include <freetype/internal/psaux.h>
+
+#include "cidload.h"
+
+#include "ciderrs.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 cidload
+
+
+ /* read a single offset */
+ FT_LOCAL_DEF( FT_ULong )
+ cid_get_offset( FT_Byte* *start,
+ FT_UInt offsize )
+ {
+ FT_ULong result;
+ FT_Byte* p = *start;
+
+
+ for ( result = 0; offsize > 0; offsize-- )
+ {
+ result <<= 8;
+ result |= *p++;
+ }
+
+ *start = p;
+ return result;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** TYPE 1 SYMBOL PARSING *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ static FT_Error
+ cid_load_keyword( CID_Face face,
+ CID_Loader* loader,
+ const T1_Field keyword )
+ {
+ FT_Error error;
+ CID_Parser* parser = &loader->parser;
+ FT_Byte* object;
+ void* dummy_object;
+ CID_FaceInfo cid = &face->cid;
+
+
+ /* if the keyword has a dedicated callback, call it */
+ if ( keyword->type == T1_FIELD_TYPE_CALLBACK )
+ {
+ FT_TRACE4(( " %s", keyword->ident ));
+
+ keyword->reader( (FT_Face)face, parser );
+ error = parser->root.error;
+ goto Exit;
+ }
+
+ /* we must now compute the address of our target object */
+ switch ( keyword->location )
+ {
+ case T1_FIELD_LOCATION_CID_INFO:
+ object = (FT_Byte*)cid;
+ break;
+
+ case T1_FIELD_LOCATION_FONT_INFO:
+ object = (FT_Byte*)&cid->font_info;
+ break;
+
+ case T1_FIELD_LOCATION_FONT_EXTRA:
+ object = (FT_Byte*)&face->font_extra;
+ break;
+
+ case T1_FIELD_LOCATION_BBOX:
+ object = (FT_Byte*)&cid->font_bbox;
+ break;
+
+ default:
+ {
+ CID_FaceDict dict;
+
+
+ if ( parser->num_dict >= cid->num_dicts )
+ {
+ FT_ERROR(( "cid_load_keyword: invalid use of `%s'\n",
+ keyword->ident ));
+ error = FT_THROW( Syntax_Error );
+ goto Exit;
+ }
+
+ dict = cid->font_dicts + parser->num_dict;
+ switch ( keyword->location )
+ {
+ case T1_FIELD_LOCATION_PRIVATE:
+ object = (FT_Byte*)&dict->private_dict;
+ break;
+
+ default:
+ object = (FT_Byte*)dict;
+ }
+ }
+ }
+
+ FT_TRACE4(( " %s", keyword->ident ));
+
+ dummy_object = object;
+
+ /* now, load the keyword data in the object's field(s) */
+ if ( keyword->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
+ keyword->type == T1_FIELD_TYPE_FIXED_ARRAY )
+ error = cid_parser_load_field_table( &loader->parser, keyword,
+ &dummy_object );
+ else
+ error = cid_parser_load_field( &loader->parser,
+ keyword, &dummy_object );
+
+ FT_TRACE4(( "\n" ));
+
+ Exit:
+ return error;
+ }
+
+
+ FT_CALLBACK_DEF( void )
+ cid_parse_font_matrix( CID_Face face,
+ CID_Parser* parser )
+ {
+ CID_FaceDict dict;
+ FT_Face root = (FT_Face)&face->root;
+ FT_Fixed temp[6];
+ FT_Fixed temp_scale;
+
+
+ if ( parser->num_dict < face->cid.num_dicts )
+ {
+ FT_Matrix* matrix;
+ FT_Vector* offset;
+ FT_Int result;
+
+
+ dict = face->cid.font_dicts + parser->num_dict;
+ matrix = &dict->font_matrix;
+ offset = &dict->font_offset;
+
+ /* input is scaled by 1000 to accommodate default FontMatrix */
+ result = cid_parser_to_fixed_array( parser, 6, temp, 3 );
+
+ if ( result < 6 )
+ {
+ FT_ERROR(( "cid_parse_font_matrix: not enough matrix elements\n" ));
+ goto Exit;
+ }
+
+ FT_TRACE4(( " [%f %f %f %f %f %f]\n",
+ (double)temp[0] / 65536 / 1000,
+ (double)temp[1] / 65536 / 1000,
+ (double)temp[2] / 65536 / 1000,
+ (double)temp[3] / 65536 / 1000,
+ (double)temp[4] / 65536 / 1000,
+ (double)temp[5] / 65536 / 1000 ));
+
+ temp_scale = FT_ABS( temp[3] );
+
+ if ( temp_scale == 0 )
+ {
+ FT_ERROR(( "cid_parse_font_matrix: invalid font matrix\n" ));
+ goto Exit;
+ }
+
+ /* atypical case */
+ if ( temp_scale != 0x10000L )
+ {
+ /* set units per EM based on FontMatrix values */
+ root->units_per_EM = (FT_UShort)FT_DivFix( 1000, temp_scale );
+
+ temp[0] = FT_DivFix( temp[0], temp_scale );
+ temp[1] = FT_DivFix( temp[1], temp_scale );
+ temp[2] = FT_DivFix( temp[2], temp_scale );
+ temp[4] = FT_DivFix( temp[4], temp_scale );
+ temp[5] = FT_DivFix( temp[5], temp_scale );
+ temp[3] = temp[3] < 0 ? -0x10000L : 0x10000L;
+ }
+
+ matrix->xx = temp[0];
+ matrix->yx = temp[1];
+ matrix->xy = temp[2];
+ matrix->yy = temp[3];
+
+ if ( !FT_Matrix_Check( matrix ) )
+ {
+ FT_ERROR(( "t1_parse_font_matrix: invalid font matrix\n" ));
+ parser->root.error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+ /* note that the font offsets are expressed in integer font units */
+ offset->x = temp[4] >> 16;
+ offset->y = temp[5] >> 16;
+ }
+
+ Exit:
+ return;
+ }
+
+
+ FT_CALLBACK_DEF( void )
+ parse_fd_array( CID_Face face,
+ CID_Parser* parser )
+ {
+ CID_FaceInfo cid = &face->cid;
+ FT_Memory memory = face->root.memory;
+ FT_Stream stream = parser->stream;
+ FT_Error error = FT_Err_Ok;
+ FT_Long num_dicts, max_dicts;
+
+
+ num_dicts = cid_parser_to_int( parser );
+ if ( num_dicts < 0 || num_dicts > FT_INT_MAX )
+ {
+ FT_ERROR(( "parse_fd_array: invalid number of dictionaries\n" ));
+ goto Exit;
+ }
+
+ FT_TRACE4(( " %ld\n", num_dicts ));
+
+ /*
+ * A single entry in the FDArray must (at least) contain the following
+ * structure elements.
+ *
+ * %ADOBeginFontDict 18
+ * X dict begin 13
+ * /FontMatrix [X X X X] 22
+ * /Private X dict begin 22
+ * end 4
+ * end 4
+ * %ADOEndFontDict 16
+ *
+ * This needs 18+13+22+22+4+4+16=99 bytes or more. Normally, you also
+ * need a `dup X' at the very beginning and a `put' at the end, so a
+ * rough guess using 100 bytes as the minimum is justified.
+ */
+ max_dicts = (FT_Long)( stream->size / 100 );
+ if ( num_dicts > max_dicts )
+ {
+ FT_TRACE0(( "parse_fd_array: adjusting FDArray size"
+ " (from %ld to %ld)\n",
+ num_dicts, max_dicts ));
+ num_dicts = max_dicts;
+ }
+
+ if ( !cid->font_dicts )
+ {
+ FT_UInt n;
+
+
+ if ( FT_NEW_ARRAY( cid->font_dicts, num_dicts ) )
+ goto Exit;
+
+ cid->num_dicts = num_dicts;
+
+ /* set some default values (the same as for Type 1 fonts) */
+ for ( n = 0; n < cid->num_dicts; n++ )
+ {
+ CID_FaceDict dict = cid->font_dicts + n;
+
+
+ dict->private_dict.blue_shift = 7;
+ dict->private_dict.blue_fuzz = 1;
+ dict->private_dict.lenIV = 4;
+ dict->private_dict.expansion_factor = (FT_Fixed)( 0.06 * 0x10000L );
+ dict->private_dict.blue_scale = (FT_Fixed)(
+ 0.039625 * 0x10000L * 1000 );
+ }
+ }
+
+ Exit:
+ return;
+ }
+
+
+ /* By mistake, `expansion_factor' appears both in PS_PrivateRec */
+ /* and CID_FaceDictRec (both are public header files and can't */
+ /* changed). We simply copy the value. */
+
+ FT_CALLBACK_DEF( void )
+ parse_expansion_factor( CID_Face face,
+ CID_Parser* parser )
+ {
+ CID_FaceDict dict;
+
+
+ if ( parser->num_dict < face->cid.num_dicts )
+ {
+ dict = face->cid.font_dicts + parser->num_dict;
+
+ dict->expansion_factor = cid_parser_to_fixed( parser, 0 );
+ dict->private_dict.expansion_factor = dict->expansion_factor;
+
+ FT_TRACE4(( "%ld\n", dict->expansion_factor ));
+ }
+
+ return;
+ }
+
+
+ /* By mistake, `CID_FaceDictRec' doesn't contain a field for the */
+ /* `FontName' keyword. FreeType doesn't need it, but it is nice */
+ /* to catch it for producing better trace output. */
+
+ FT_CALLBACK_DEF( void )
+ parse_font_name( CID_Face face,
+ CID_Parser* parser )
+ {
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( parser->num_dict < face->cid.num_dicts )
+ {
+ T1_TokenRec token;
+ FT_UInt len;
+
+
+ cid_parser_to_token( parser, &token );
+
+ len = (FT_UInt)( token.limit - token.start );
+ if ( len )
+ FT_TRACE4(( " %.*s\n", len, token.start ));
+ else
+ FT_TRACE4(( " <no value>\n" ));
+ }
+#else
+ FT_UNUSED( face );
+ FT_UNUSED( parser );
+#endif
+
+ return;
+ }
+
+
+ static
+ const T1_FieldRec cid_field_records[] =
+ {
+
+#include "cidtoken.h"
+
+ T1_FIELD_CALLBACK( "FDArray", parse_fd_array, 0 )
+ T1_FIELD_CALLBACK( "FontMatrix", cid_parse_font_matrix, 0 )
+ T1_FIELD_CALLBACK( "ExpansionFactor", parse_expansion_factor, 0 )
+ T1_FIELD_CALLBACK( "FontName", parse_font_name, 0 )
+
+ { 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0, 0 }
+ };
+
+
+ static FT_Error
+ cid_parse_dict( CID_Face face,
+ CID_Loader* loader,
+ FT_Byte* base,
+ FT_ULong size )
+ {
+ CID_Parser* parser = &loader->parser;
+
+
+ parser->root.cursor = base;
+ parser->root.limit = base + size;
+ parser->root.error = FT_Err_Ok;
+
+ {
+ FT_Byte* cur = base;
+ FT_Byte* limit = cur + size;
+
+
+ for (;;)
+ {
+ FT_Byte* newlimit;
+
+
+ parser->root.cursor = cur;
+ cid_parser_skip_spaces( parser );
+
+ if ( parser->root.cursor >= limit )
+ newlimit = limit - 1 - 17;
+ else
+ newlimit = parser->root.cursor - 17;
+
+ /* look for `%ADOBeginFontDict' */
+ for ( ; cur < newlimit; cur++ )
+ {
+ if ( *cur == '%' &&
+ ft_strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 )
+ {
+ /* if /FDArray was found, then cid->num_dicts is > 0, and */
+ /* we can start increasing parser->num_dict */
+ if ( face->cid.num_dicts > 0 )
+ {
+ parser->num_dict++;
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ FT_TRACE4(( " FontDict %u", parser->num_dict ));
+ if ( parser->num_dict > face->cid.num_dicts )
+ FT_TRACE4(( " (ignored)" ));
+ FT_TRACE4(( "\n" ));
+#endif
+ }
+ }
+ }
+
+ cur = parser->root.cursor;
+ /* no error can occur in cid_parser_skip_spaces */
+ if ( cur >= limit )
+ break;
+
+ cid_parser_skip_PS_token( parser );
+ if ( parser->root.cursor >= limit || parser->root.error )
+ break;
+
+ /* look for immediates */
+ if ( *cur == '/' && cur + 2 < limit )
+ {
+ FT_UInt len;
+
+
+ cur++;
+ len = (FT_UInt)( parser->root.cursor - cur );
+
+ if ( len > 0 && len < 22 )
+ {
+ /* now compare the immediate name to the keyword table */
+ T1_Field keyword = (T1_Field)cid_field_records;
+
+
+ for (;;)
+ {
+ FT_Byte* name;
+
+
+ name = (FT_Byte*)keyword->ident;
+ if ( !name )
+ break;
+
+ if ( cur[0] == name[0] &&
+ len == ft_strlen( (const char*)name ) )
+ {
+ FT_UInt n;
+
+
+ for ( n = 1; n < len; n++ )
+ if ( cur[n] != name[n] )
+ break;
+
+ if ( n >= len )
+ {
+ /* we found it - run the parsing callback */
+ parser->root.error = cid_load_keyword( face,
+ loader,
+ keyword );
+ if ( parser->root.error )
+ return parser->root.error;
+ break;
+ }
+ }
+ keyword++;
+ }
+ }
+ }
+
+ cur = parser->root.cursor;
+ }
+
+ if ( !face->cid.num_dicts )
+ {
+ FT_ERROR(( "cid_parse_dict: No font dictionary found\n" ));
+ return FT_THROW( Invalid_File_Format );
+ }
+ }
+
+ return parser->root.error;
+ }
+
+
+ /* read the subrmap and the subrs of each font dict */
+ static FT_Error
+ cid_read_subrs( CID_Face face )
+ {
+ CID_FaceInfo cid = &face->cid;
+ FT_Memory memory = face->root.memory;
+ FT_Stream stream = face->cid_stream;
+ FT_Error error;
+ FT_UInt n;
+ CID_Subrs subr;
+ FT_UInt max_offsets = 0;
+ FT_ULong* offsets = NULL;
+ PSAux_Service psaux = (PSAux_Service)face->psaux;
+
+
+ if ( FT_NEW_ARRAY( face->subrs, cid->num_dicts ) )
+ goto Exit;
+
+ subr = face->subrs;
+ for ( n = 0; n < cid->num_dicts; n++, subr++ )
+ {
+ CID_FaceDict dict = cid->font_dicts + n;
+ FT_Int lenIV = dict->private_dict.lenIV;
+ FT_UInt count, num_subrs = dict->num_subrs;
+ FT_ULong data_len;
+ FT_Byte* p;
+
+
+ if ( !num_subrs )
+ continue;
+
+ /* reallocate offsets array if needed */
+ if ( num_subrs + 1 > max_offsets )
+ {
+ FT_UInt new_max = FT_PAD_CEIL( num_subrs + 1, 4 );
+
+
+ if ( new_max <= max_offsets )
+ {
+ error = FT_THROW( Syntax_Error );
+ goto Fail;
+ }
+
+ if ( FT_QRENEW_ARRAY( offsets, max_offsets, new_max ) )
+ goto Fail;
+
+ max_offsets = new_max;
+ }
+
+ /* read the subrmap's offsets */
+ if ( FT_STREAM_SEEK( cid->data_offset + dict->subrmap_offset ) ||
+ FT_FRAME_ENTER( ( num_subrs + 1 ) * dict->sd_bytes ) )
+ goto Fail;
+
+ p = (FT_Byte*)stream->cursor;
+ for ( count = 0; count <= num_subrs; count++ )
+ offsets[count] = cid_get_offset( &p, dict->sd_bytes );
+
+ FT_FRAME_EXIT();
+
+ /* offsets must be ordered */
+ for ( count = 1; count <= num_subrs; count++ )
+ if ( offsets[count - 1] > offsets[count] )
+ {
+ FT_ERROR(( "cid_read_subrs: offsets are not ordered\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Fail;
+ }
+
+ if ( offsets[num_subrs] > stream->size - cid->data_offset )
+ {
+ FT_ERROR(( "cid_read_subrs: too large `subrs' offsets\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Fail;
+ }
+
+ /* now, compute the size of subrs charstrings, */
+ /* allocate, and read them */
+ data_len = offsets[num_subrs] - offsets[0];
+
+ if ( FT_QNEW_ARRAY( subr->code, num_subrs + 1 ) ||
+ FT_QALLOC( subr->code[0], data_len ) )
+ goto Fail;
+
+ if ( FT_STREAM_SEEK( cid->data_offset + offsets[0] ) ||
+ FT_STREAM_READ( subr->code[0], data_len ) )
+ goto Fail;
+
+ /* set up pointers */
+ for ( count = 1; count <= num_subrs; count++ )
+ {
+ FT_ULong len;
+
+
+ len = offsets[count] - offsets[count - 1];
+ subr->code[count] = subr->code[count - 1] + len;
+ }
+
+ /* decrypt subroutines, but only if lenIV >= 0 */
+ if ( lenIV >= 0 )
+ {
+ for ( count = 0; count < num_subrs; count++ )
+ {
+ FT_ULong len;
+
+
+ len = offsets[count + 1] - offsets[count];
+ psaux->t1_decrypt( subr->code[count], len, 4330 );
+ }
+ }
+
+ subr->num_subrs = (FT_Int)num_subrs;
+ }
+
+ Exit:
+ FT_FREE( offsets );
+ return error;
+
+ Fail:
+ if ( face->subrs )
+ {
+ for ( n = 0; n < cid->num_dicts; n++ )
+ {
+ if ( face->subrs[n].code )
+ FT_FREE( face->subrs[n].code[0] );
+
+ FT_FREE( face->subrs[n].code );
+ }
+ FT_FREE( face->subrs );
+ }
+ goto Exit;
+ }
+
+
+ static void
+ cid_init_loader( CID_Loader* loader,
+ CID_Face face )
+ {
+ FT_UNUSED( face );
+
+ FT_ZERO( loader );
+ }
+
+
+ static void
+ cid_done_loader( CID_Loader* loader )
+ {
+ CID_Parser* parser = &loader->parser;
+
+
+ /* finalize parser */
+ cid_parser_done( parser );
+ }
+
+
+ static FT_Error
+ cid_hex_to_binary( FT_Byte* data,
+ FT_ULong data_len,
+ FT_ULong offset,
+ CID_Face face,
+ FT_ULong* data_written )
+ {
+ FT_Stream stream = face->root.stream;
+ FT_Error error;
+
+ FT_Byte buffer[256];
+ FT_Byte *p, *plimit;
+ FT_Byte *d = data, *dlimit;
+ FT_Byte val;
+
+ FT_Bool upper_nibble, done;
+
+
+ if ( FT_STREAM_SEEK( offset ) )
+ goto Exit;
+
+ dlimit = d + data_len;
+ p = buffer;
+ plimit = p;
+
+ upper_nibble = 1;
+ done = 0;
+
+ while ( d < dlimit )
+ {
+ if ( p >= plimit )
+ {
+ FT_ULong oldpos = FT_STREAM_POS();
+ FT_ULong size = stream->size - oldpos;
+
+
+ if ( size == 0 )
+ {
+ error = FT_THROW( Syntax_Error );
+ goto Exit;
+ }
+
+ if ( FT_STREAM_READ( buffer, 256 > size ? size : 256 ) )
+ goto Exit;
+ p = buffer;
+ plimit = p + FT_STREAM_POS() - oldpos;
+ }
+
+ if ( ft_isdigit( *p ) )
+ val = (FT_Byte)( *p - '0' );
+ else if ( *p >= 'a' && *p <= 'f' )
+ val = (FT_Byte)( *p - 'a' + 10 );
+ else if ( *p >= 'A' && *p <= 'F' )
+ val = (FT_Byte)( *p - 'A' + 10 );
+ else if ( *p == ' ' ||
+ *p == '\t' ||
+ *p == '\r' ||
+ *p == '\n' ||
+ *p == '\f' ||
+ *p == '\0' )
+ {
+ p++;
+ continue;
+ }
+ else if ( *p == '>' )
+ {
+ val = 0;
+ done = 1;
+ }
+ else
+ {
+ error = FT_THROW( Syntax_Error );
+ goto Exit;
+ }
+
+ if ( upper_nibble )
+ *d = (FT_Byte)( val << 4 );
+ else
+ {
+ *d = (FT_Byte)( *d + val );
+ d++;
+ }
+
+ upper_nibble = (FT_Byte)( 1 - upper_nibble );
+
+ if ( done )
+ break;
+
+ p++;
+ }
+
+ error = FT_Err_Ok;
+
+ Exit:
+ *data_written = (FT_ULong)( d - data );
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ cid_face_open( CID_Face face,
+ FT_Int face_index )
+ {
+ CID_Loader loader;
+ CID_Parser* parser;
+ FT_Memory memory = face->root.memory;
+ FT_Error error;
+ FT_UInt n;
+
+ CID_FaceInfo cid = &face->cid;
+
+ FT_ULong binary_length;
+
+
+ cid_init_loader( &loader, face );
+
+ parser = &loader.parser;
+ error = cid_parser_new( parser, face->root.stream, face->root.memory,
+ (PSAux_Service)face->psaux );
+ if ( error )
+ goto Exit;
+
+ error = cid_parse_dict( face, &loader,
+ parser->postscript,
+ parser->postscript_len );
+ if ( error )
+ goto Exit;
+
+ if ( face_index < 0 )
+ goto Exit;
+
+ if ( FT_NEW( face->cid_stream ) )
+ goto Exit;
+
+ if ( parser->binary_length )
+ {
+ if ( parser->binary_length >
+ face->root.stream->size - parser->data_offset )
+ {
+ FT_TRACE0(( "cid_face_open: adjusting length of binary data\n" ));
+ FT_TRACE0(( " (from %lu to %lu bytes)\n",
+ parser->binary_length,
+ face->root.stream->size - parser->data_offset ));
+ parser->binary_length = face->root.stream->size -
+ parser->data_offset;
+ }
+
+ /* we must convert the data section from hexadecimal to binary */
+ if ( FT_QALLOC( face->binary_data, parser->binary_length ) ||
+ FT_SET_ERROR( cid_hex_to_binary( face->binary_data,
+ parser->binary_length,
+ parser->data_offset,
+ face,
+ &binary_length ) ) )
+ goto Exit;
+
+ FT_Stream_OpenMemory( face->cid_stream,
+ face->binary_data, binary_length );
+ cid->data_offset = 0;
+ }
+ else
+ {
+ *face->cid_stream = *face->root.stream;
+ cid->data_offset = loader.parser.data_offset;
+ }
+
+ /* sanity tests */
+
+ if ( cid->gd_bytes == 0 )
+ {
+ FT_ERROR(( "cid_face_open:"
+ " Invalid `GDBytes' value\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+ /* allow at most 32bit offsets */
+ if ( cid->fd_bytes > 4 || cid->gd_bytes > 4 )
+ {
+ FT_ERROR(( "cid_face_open:"
+ " Values of `FDBytes' or `GDBytes' larger than 4\n" ));
+ FT_ERROR(( " "
+ " are not supported\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+ binary_length = face->cid_stream->size - cid->data_offset;
+
+ if ( cid->cidmap_offset > binary_length )
+ {
+ FT_ERROR(( "cid_face_open: Invalid `CIDMapOffset' value\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+ /* the initial pre-check prevents the multiplication overflow */
+ if ( cid->cid_count > FT_ULONG_MAX / 8 ||
+ cid->cid_count * ( cid->fd_bytes + cid->gd_bytes ) >
+ binary_length - cid->cidmap_offset )
+ {
+ FT_ERROR(( "cid_face_open: Invalid `CIDCount' value\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+
+ for ( n = 0; n < cid->num_dicts; n++ )
+ {
+ CID_FaceDict dict = cid->font_dicts + n;
+
+
+ /* the upper limits are ad-hoc values */
+ if ( dict->private_dict.blue_shift > 1000 ||
+ dict->private_dict.blue_shift < 0 )
+ {
+ FT_TRACE2(( "cid_face_open:"
+ " setting unlikely BlueShift value %d to default (7)\n",
+ dict->private_dict.blue_shift ));
+ dict->private_dict.blue_shift = 7;
+ }
+
+ if ( dict->private_dict.blue_fuzz > 1000 ||
+ dict->private_dict.blue_fuzz < 0 )
+ {
+ FT_TRACE2(( "cid_face_open:"
+ " setting unlikely BlueFuzz value %d to default (1)\n",
+ dict->private_dict.blue_fuzz ));
+ dict->private_dict.blue_fuzz = 1;
+ }
+
+ if ( dict->num_subrs && dict->sd_bytes == 0 )
+ {
+ FT_ERROR(( "cid_face_open: Invalid `SDBytes' value\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+ if ( dict->sd_bytes > 4 )
+ {
+ FT_ERROR(( "cid_face_open:"
+ " Values of `SDBytes' larger than 4"
+ " are not supported\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+ if ( dict->subrmap_offset > binary_length )
+ {
+ FT_ERROR(( "cid_face_open: Invalid `SubrMapOffset' value\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+
+ /* the initial pre-check prevents the multiplication overflow */
+ if ( dict->num_subrs > FT_UINT_MAX / 4 ||
+ dict->num_subrs * dict->sd_bytes >
+ binary_length - dict->subrmap_offset )
+ {
+ FT_ERROR(( "cid_face_open: Invalid `SubrCount' value\n" ));
+ error = FT_THROW( Invalid_File_Format );
+ goto Exit;
+ }
+ }
+
+ /* we can now safely proceed */
+ error = cid_read_subrs( face );
+
+ Exit:
+ cid_done_loader( &loader );
+ return error;
+ }
+
+
+/* END */
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-19 15:49:13 +0000