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freetype2
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Code Issues 4 Releases Wiki Activity

* docs/CHANGES: updating 

* src/type1/t1parse.c (T1_New_Parser), src/type42/t42parse.c
    (t42_parser_init): modifying functions to check the font header before
    allocating anything on the heap.

    * internal/freetype/ftmemory.h: introducing the new macros FT_ARRAY_MAX
    and FT_ARRAY_CHECK

    * src/pcf/pcfread.c, src/pcf/pcfutil.c: minor fixes and simplifications.
    try to protect the PCF driver from doing stupid things with broken fonts.
This commit is contained in:
David Turner 2005-03-15 23:31:48 +00:00
parent 68df4f732d
commit 58609c40c8
6 changed files with 123 additions and 77 deletions
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33
docs/CHANGES
View File

@ -18,10 +18,30 @@ LATEST CHANGES BETWEEN 2.1.10 and 2.1.9
highly recommended to upgrade.
- FreeType didn't properly parse empty Type 1 glyphs.
- An unbounded dynamic buffer growth was fixed in the PFR loader
- Several bugs were fixed in the cache sub-system.
- Fixed bug #12263: incorrect behaviour when resizing to distinct but
very close character pixel sizes through FT_Set_Char_Size
- The auto-hinter didn't work when a font didn't have a Unicode charmap.
it even refused to load the glyphs !
II. IMPORTANT CHANGES
- a LOT of work has been done in order to drastically reduce the
amount of heap memory used by FreeType, especially when using
memory-mapped font files (which is the default on Unix systems
which support them). This should be good news for any Unix distribution
upgrading to this release of the font engine.
- The auto-hinter has been completely rewritten as a new module,
called the 'auto-fitter'. The latter is the new default auto-hinting
module. It also consumes a lot less memory than its predecessor.
- George Williams contributed code to read kerning data from PFM
files.
@ -53,6 +73,19 @@ LATEST CHANGES BETWEEN 2.1.10 and 2.1.9
- A new option `--ftversion' has been added to freetype-config to
return the FreeType version.
- The memory debugger has been updated to dump allocation statistics
on all allocation sources in the library. This is useful to spot
greedy allocations when loading and processing fonts.
- we removed a huge array of constant pointers to constant strings
in the 'psnames' module. The problem was that when compiled in PIC
mode (i.e. when generating a Unix shared object / dll), the array
could only be placed in the non-shared writable section of the library*
since absolute pointers are not relocatable by nature.
This saves about 16Kb per process linked to FreeType. We also store
the array in a novel compressed way that saves about 20 Kb of code
as well.
LATEST CHANGES BETWEEN 2.1.9 and 2.1.8

8
include/freetype/internal/ftmemory.h
View File

@ -270,6 +270,13 @@ FT_BEGIN_HEADER
#define FT_ARRAY_MOVE( dest, source, count ) \
FT_MEM_MOVE( dest, source, (count) * sizeof ( *(dest) ) )
/* return the maximum number of adressable elements in an array
* we limit ourselves to INT_MAX, rather than UINT_MAX, to avoid
* any problems
*/
#define FT_ARRAY_MAX( ptr ) (FT_INT_MAX/sizeof( *(ptr) ))
#define FT_ARRAY_CHECK( ptr, count ) ( (count) <= FT_ARRAY_MAX(ptr) )
/*************************************************************************/
/* */
@ -413,6 +420,7 @@ FT_BEGIN_HEADER
FT_REALLOC( _pointer, (_old_) * sizeof ( _type_ ), \
(_new_) * sizeof ( _type_ ) )
/* */

3
src/pcf/pcfread.c
View File

@ -101,7 +101,8 @@ THE SOFTWARE.
FT_STREAM_READ_FIELDS ( pcf_toc_header, toc ) )
return PCF_Err_Cannot_Open_Resource;
if ( toc->version != PCF_FILE_VERSION )
if ( toc->version != PCF_FILE_VERSION ||
toc->count > FT_ARRAY_MAX( face->toc.tables ) )
return PCF_Err_Invalid_File_Format;
if ( FT_NEW_ARRAY( face->toc.tables, toc->count ) )

55
src/pcf/pcfutil.c
View File

@ -32,44 +32,6 @@ in this Software without prior written authorization from The Open Group.
#include "pcfutil.h"
/* Utility functions for reformatting font bitmaps */
static const unsigned char _reverse_byte[0x100] =
{
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
/*
* Invert bit order within each BYTE of an array.
*/
@ -78,11 +40,16 @@ in this Software without prior written authorization from The Open Group.
BitOrderInvert( unsigned char* buf,
int nbytes )
{
const unsigned char* rev = _reverse_byte;
for ( ; --nbytes >= 0; buf++ )
*buf = rev[*buf];
{
unsigned int val = *buf;
val = ((val >> 1) & 0x55) | ((val << 1) & 0xAA);
val = ((val >> 2) & 0x33) | ((val << 2) & 0xCC);
val = ((val >> 4) & 0x0F) | ((val << 4) & 0xF0);
*buf = (unsigned char)val;
}
}
@ -97,7 +64,7 @@ in this Software without prior written authorization from The Open Group.
unsigned char c;
for ( ; nbytes > 0; nbytes -= 2, buf += 2 )
for ( ; nbytes >= 2; nbytes -= 2, buf += 2 )
{
c = buf[0];
buf[0] = buf[1];
@ -116,7 +83,7 @@ in this Software without prior written authorization from The Open Group.
unsigned char c;
for ( ; nbytes > 0; nbytes -= 4, buf += 4 )
for ( ; nbytes >= 4; nbytes -= 4, buf += 4 )
{
c = buf[0];
buf[0] = buf[3];

73
src/type1/t1parse.c
View File

@ -93,6 +93,40 @@
}
static FT_Error
check_type1_format( FT_Stream stream,
const char* header_string,
size_t header_length )
{
FT_Error error;
FT_UShort tag;
FT_Long size;
if ( FT_STREAM_SEEK( 0 ) )
goto Exit;
error = read_pfb_tag( stream, &tag, &size );
if ( error )
goto Exit;
if ( tag != 0x8001U && FT_STREAM_SEEK( 0 ) )
goto Exit;
if ( !FT_FRAME_ENTER( header_length ) )
{
error = 0;
if ( ft_memcmp( stream->cursor, header_string, header_length ) != 0 )
error = T1_Err_Unknown_File_Format;
FT_FRAME_EXIT();
}
Exit:
return error;
}
FT_LOCAL_DEF( FT_Error )
T1_New_Parser( T1_Parser parser,
FT_Stream stream,
@ -115,6 +149,21 @@
parser->in_memory = 0;
parser->single_block = 0;
/* check the header format */
error = check_type1_format( stream, "%!PS-AdobeFont-1", 16 );
if ( error )
{
if ( error != T1_Err_Unknown_File_Format )
goto Exit;
error = check_type1_format( stream, "%!FontType", 10 );
if ( error )
{
FT_TRACE2(( "[not a Type1 font]\n" ));
goto Exit;
}
}
/******************************************************************/
/* */
/* Here a short summary of what is going on: */
@ -167,32 +216,16 @@
}
else
{
/* read segment in memory */
/* read segment in memory - yeah that sucks, but so does the format */
if ( FT_ALLOC( parser->base_dict, size ) ||
FT_STREAM_READ( parser->base_dict, size ) )
goto Exit;
parser->base_len = size;
}
/* Now check font format; we must see `%!PS-AdobeFont-1' */
/* or `%!FontType' */
{
if ( size <= 16 ||
( ft_strncmp( (const char*)parser->base_dict,
"%!PS-AdobeFont-1", 16 ) &&
ft_strncmp( (const char*)parser->base_dict,
"%!FontType", 10 ) ) )
{
FT_TRACE2(( "[not a Type1 font]\n" ));
error = T1_Err_Unknown_File_Format;
}
else
{
parser->root.base = parser->base_dict;
parser->root.cursor = parser->base_dict;
parser->root.limit = parser->root.cursor + parser->base_len;
}
}
parser->root.base = parser->base_dict;
parser->root.cursor = parser->base_dict;
parser->root.limit = parser->root.cursor + parser->base_len;
Exit:
if ( error && !parser->in_memory )

28
src/type42/t42parse.c
View File

@ -159,7 +159,19 @@
/* parser->in_memory is set if we have a memory stream. */
/* */
if ( FT_STREAM_SEEK( 0L ) )
if ( FT_STREAM_SEEK( 0L ) ||
FT_FRAME_ENTER( 17 ) )
goto Exit;
if ( ft_memcmp( stream->cursor, "%!PS-TrueTypeFont", 17 ) != 0 )
{
FT_TRACE2(( "not a Type42 font\n" ));
error = T42_Err_Unknown_File_Format;
}
FT_FRAME_EXIT();
if ( error || FT_STREAM_SEEK( 0 ) )
goto Exit;
size = stream->size;
@ -188,17 +200,9 @@
parser->base_len = size;
}
/* Now check font format; we must see `%!PS-TrueTypeFont' */
if ( size <= 17 ||
( ft_strncmp( (const char*)parser->base_dict,
"%!PS-TrueTypeFont", 17 ) ) )
error = T42_Err_Unknown_File_Format;
else
{
parser->root.base = parser->base_dict;
parser->root.cursor = parser->base_dict;
parser->root.limit = parser->root.cursor + parser->base_len;
}
parser->root.base = parser->base_dict;
parser->root.cursor = parser->base_dict;
parser->root.limit = parser->root.cursor + parser->base_len;
Exit:
if ( error && !parser->in_memory )