0,0 → 1,511 |
/***************************************************************************/ |
/* */ |
/* ftbzip2.c */ |
/* */ |
/* FreeType support for .bz2 compressed files. */ |
/* */ |
/* This optional component relies on libbz2. It should mainly be used to */ |
/* parse compressed PCF fonts, as found with many X11 server */ |
/* distributions. */ |
/* */ |
/* Copyright 2010, 2012, 2013 by */ |
/* Joel Klinghed. */ |
/* */ |
/* Based on src/gzip/ftgzip.c, Copyright 2002 - 2010 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 FT_INTERNAL_MEMORY_H |
#include FT_INTERNAL_STREAM_H |
#include FT_INTERNAL_DEBUG_H |
#include FT_BZIP2_H |
#include FT_CONFIG_STANDARD_LIBRARY_H |
|
|
#include FT_MODULE_ERRORS_H |
|
#undef __FTERRORS_H__ |
|
#undef FT_ERR_PREFIX |
#define FT_ERR_PREFIX Bzip2_Err_ |
#define FT_ERR_BASE FT_Mod_Err_Bzip2 |
|
#include FT_ERRORS_H |
|
|
#ifdef FT_CONFIG_OPTION_USE_BZIP2 |
|
#ifdef FT_CONFIG_OPTION_PIC |
#error "bzip2 code does not support PIC yet" |
#endif |
|
#define BZ_NO_STDIO /* Do not need FILE */ |
#include <bzlib.h> |
|
|
/***************************************************************************/ |
/***************************************************************************/ |
/***** *****/ |
/***** B Z I P 2 M E M O R Y M A N A G E M E N T *****/ |
/***** *****/ |
/***************************************************************************/ |
/***************************************************************************/ |
|
/* it is better to use FreeType memory routines instead of raw |
'malloc/free' */ |
|
typedef void *(* alloc_func)(void*, int, int); |
typedef void (* free_func)(void*, void*); |
|
static void* |
ft_bzip2_alloc( FT_Memory memory, |
int items, |
int size ) |
{ |
FT_ULong sz = (FT_ULong)size * items; |
FT_Error error; |
FT_Pointer p = NULL; |
|
|
(void)FT_ALLOC( p, sz ); |
return p; |
} |
|
|
static void |
ft_bzip2_free( FT_Memory memory, |
void* address ) |
{ |
FT_MEM_FREE( address ); |
} |
|
|
/***************************************************************************/ |
/***************************************************************************/ |
/***** *****/ |
/***** B Z I P 2 F I L E D E S C R I P T O R *****/ |
/***** *****/ |
/***************************************************************************/ |
/***************************************************************************/ |
|
#define FT_BZIP2_BUFFER_SIZE 4096 |
|
typedef struct FT_BZip2FileRec_ |
{ |
FT_Stream source; /* parent/source stream */ |
FT_Stream stream; /* embedding stream */ |
FT_Memory memory; /* memory allocator */ |
bz_stream bzstream; /* bzlib input stream */ |
|
FT_Byte input[FT_BZIP2_BUFFER_SIZE]; /* input read buffer */ |
|
FT_Byte buffer[FT_BZIP2_BUFFER_SIZE]; /* output buffer */ |
FT_ULong pos; /* position in output */ |
FT_Byte* cursor; |
FT_Byte* limit; |
|
} FT_BZip2FileRec, *FT_BZip2File; |
|
|
/* check and skip .bz2 header - we don't support `transparent' compression */ |
static FT_Error |
ft_bzip2_check_header( FT_Stream stream ) |
{ |
FT_Error error = FT_Err_Ok; |
FT_Byte head[4]; |
|
|
if ( FT_STREAM_SEEK( 0 ) || |
FT_STREAM_READ( head, 4 ) ) |
goto Exit; |
|
/* head[0] && head[1] are the magic numbers; */ |
/* head[2] is the version, and head[3] the blocksize */ |
if ( head[0] != 0x42 || |
head[1] != 0x5a || |
head[2] != 0x68 ) /* only support bzip2 (huffman) */ |
{ |
error = FT_THROW( Invalid_File_Format ); |
goto Exit; |
} |
|
Exit: |
return error; |
} |
|
|
static FT_Error |
ft_bzip2_file_init( FT_BZip2File zip, |
FT_Stream stream, |
FT_Stream source ) |
{ |
bz_stream* bzstream = &zip->bzstream; |
FT_Error error = FT_Err_Ok; |
|
|
zip->stream = stream; |
zip->source = source; |
zip->memory = stream->memory; |
|
zip->limit = zip->buffer + FT_BZIP2_BUFFER_SIZE; |
zip->cursor = zip->limit; |
zip->pos = 0; |
|
/* check .bz2 header */ |
{ |
stream = source; |
|
error = ft_bzip2_check_header( stream ); |
if ( error ) |
goto Exit; |
|
if ( FT_STREAM_SEEK( 0 ) ) |
goto Exit; |
} |
|
/* initialize bzlib */ |
bzstream->bzalloc = (alloc_func)ft_bzip2_alloc; |
bzstream->bzfree = (free_func) ft_bzip2_free; |
bzstream->opaque = zip->memory; |
|
bzstream->avail_in = 0; |
bzstream->next_in = (char*)zip->buffer; |
|
if ( BZ2_bzDecompressInit( bzstream, 0, 0 ) != BZ_OK || |
bzstream->next_in == NULL ) |
error = FT_THROW( Invalid_File_Format ); |
|
Exit: |
return error; |
} |
|
|
static void |
ft_bzip2_file_done( FT_BZip2File zip ) |
{ |
bz_stream* bzstream = &zip->bzstream; |
|
|
BZ2_bzDecompressEnd( bzstream ); |
|
/* clear the rest */ |
bzstream->bzalloc = NULL; |
bzstream->bzfree = NULL; |
bzstream->opaque = NULL; |
bzstream->next_in = NULL; |
bzstream->next_out = NULL; |
bzstream->avail_in = 0; |
bzstream->avail_out = 0; |
|
zip->memory = NULL; |
zip->source = NULL; |
zip->stream = NULL; |
} |
|
|
static FT_Error |
ft_bzip2_file_reset( FT_BZip2File zip ) |
{ |
FT_Stream stream = zip->source; |
FT_Error error; |
|
|
if ( !FT_STREAM_SEEK( 0 ) ) |
{ |
bz_stream* bzstream = &zip->bzstream; |
|
|
BZ2_bzDecompressEnd( bzstream ); |
|
bzstream->avail_in = 0; |
bzstream->next_in = (char*)zip->input; |
bzstream->avail_out = 0; |
bzstream->next_out = (char*)zip->buffer; |
|
zip->limit = zip->buffer + FT_BZIP2_BUFFER_SIZE; |
zip->cursor = zip->limit; |
zip->pos = 0; |
|
BZ2_bzDecompressInit( bzstream, 0, 0 ); |
} |
|
return error; |
} |
|
|
static FT_Error |
ft_bzip2_file_fill_input( FT_BZip2File zip ) |
{ |
bz_stream* bzstream = &zip->bzstream; |
FT_Stream stream = zip->source; |
FT_ULong size; |
|
|
if ( stream->read ) |
{ |
size = stream->read( stream, stream->pos, zip->input, |
FT_BZIP2_BUFFER_SIZE ); |
if ( size == 0 ) |
return FT_THROW( Invalid_Stream_Operation ); |
} |
else |
{ |
size = stream->size - stream->pos; |
if ( size > FT_BZIP2_BUFFER_SIZE ) |
size = FT_BZIP2_BUFFER_SIZE; |
|
if ( size == 0 ) |
return FT_THROW( Invalid_Stream_Operation ); |
|
FT_MEM_COPY( zip->input, stream->base + stream->pos, size ); |
} |
stream->pos += size; |
|
bzstream->next_in = (char*)zip->input; |
bzstream->avail_in = size; |
|
return FT_Err_Ok; |
} |
|
|
static FT_Error |
ft_bzip2_file_fill_output( FT_BZip2File zip ) |
{ |
bz_stream* bzstream = &zip->bzstream; |
FT_Error error = FT_Err_Ok; |
|
|
zip->cursor = zip->buffer; |
bzstream->next_out = (char*)zip->cursor; |
bzstream->avail_out = FT_BZIP2_BUFFER_SIZE; |
|
while ( bzstream->avail_out > 0 ) |
{ |
int err; |
|
|
if ( bzstream->avail_in == 0 ) |
{ |
error = ft_bzip2_file_fill_input( zip ); |
if ( error ) |
break; |
} |
|
err = BZ2_bzDecompress( bzstream ); |
|
if ( err == BZ_STREAM_END ) |
{ |
zip->limit = (FT_Byte*)bzstream->next_out; |
if ( zip->limit == zip->cursor ) |
error = FT_THROW( Invalid_Stream_Operation ); |
break; |
} |
else if ( err != BZ_OK ) |
{ |
error = FT_THROW( Invalid_Stream_Operation ); |
break; |
} |
} |
|
return error; |
} |
|
|
/* fill output buffer; `count' must be <= FT_BZIP2_BUFFER_SIZE */ |
static FT_Error |
ft_bzip2_file_skip_output( FT_BZip2File zip, |
FT_ULong count ) |
{ |
FT_Error error = FT_Err_Ok; |
FT_ULong delta; |
|
|
for (;;) |
{ |
delta = (FT_ULong)( zip->limit - zip->cursor ); |
if ( delta >= count ) |
delta = count; |
|
zip->cursor += delta; |
zip->pos += delta; |
|
count -= delta; |
if ( count == 0 ) |
break; |
|
error = ft_bzip2_file_fill_output( zip ); |
if ( error ) |
break; |
} |
|
return error; |
} |
|
|
static FT_ULong |
ft_bzip2_file_io( FT_BZip2File zip, |
FT_ULong pos, |
FT_Byte* buffer, |
FT_ULong count ) |
{ |
FT_ULong result = 0; |
FT_Error error; |
|
|
/* Reset inflate stream if we're seeking backwards. */ |
/* Yes, that is not too efficient, but it saves memory :-) */ |
if ( pos < zip->pos ) |
{ |
error = ft_bzip2_file_reset( zip ); |
if ( error ) |
goto Exit; |
} |
|
/* skip unwanted bytes */ |
if ( pos > zip->pos ) |
{ |
error = ft_bzip2_file_skip_output( zip, (FT_ULong)( pos - zip->pos ) ); |
if ( error ) |
goto Exit; |
} |
|
if ( count == 0 ) |
goto Exit; |
|
/* now read the data */ |
for (;;) |
{ |
FT_ULong delta; |
|
|
delta = (FT_ULong)( zip->limit - zip->cursor ); |
if ( delta >= count ) |
delta = count; |
|
FT_MEM_COPY( buffer, zip->cursor, delta ); |
buffer += delta; |
result += delta; |
zip->cursor += delta; |
zip->pos += delta; |
|
count -= delta; |
if ( count == 0 ) |
break; |
|
error = ft_bzip2_file_fill_output( zip ); |
if ( error ) |
break; |
} |
|
Exit: |
return result; |
} |
|
|
/***************************************************************************/ |
/***************************************************************************/ |
/***** *****/ |
/***** B Z E M B E D D I N G S T R E A M *****/ |
/***** *****/ |
/***************************************************************************/ |
/***************************************************************************/ |
|
static void |
ft_bzip2_stream_close( FT_Stream stream ) |
{ |
FT_BZip2File zip = (FT_BZip2File)stream->descriptor.pointer; |
FT_Memory memory = stream->memory; |
|
|
if ( zip ) |
{ |
/* finalize bzip file descriptor */ |
ft_bzip2_file_done( zip ); |
|
FT_FREE( zip ); |
|
stream->descriptor.pointer = NULL; |
} |
} |
|
|
static FT_ULong |
ft_bzip2_stream_io( FT_Stream stream, |
FT_ULong pos, |
FT_Byte* buffer, |
FT_ULong count ) |
{ |
FT_BZip2File zip = (FT_BZip2File)stream->descriptor.pointer; |
|
|
return ft_bzip2_file_io( zip, pos, buffer, count ); |
} |
|
|
FT_EXPORT_DEF( FT_Error ) |
FT_Stream_OpenBzip2( FT_Stream stream, |
FT_Stream source ) |
{ |
FT_Error error; |
FT_Memory memory = source->memory; |
FT_BZip2File zip = NULL; |
|
|
/* |
* check the header right now; this prevents allocating unnecessary |
* objects when we don't need them |
*/ |
error = ft_bzip2_check_header( source ); |
if ( error ) |
goto Exit; |
|
FT_ZERO( stream ); |
stream->memory = memory; |
|
if ( !FT_QNEW( zip ) ) |
{ |
error = ft_bzip2_file_init( zip, stream, source ); |
if ( error ) |
{ |
FT_FREE( zip ); |
goto Exit; |
} |
|
stream->descriptor.pointer = zip; |
} |
|
stream->size = 0x7FFFFFFFL; /* don't know the real size! */ |
stream->pos = 0; |
stream->base = 0; |
stream->read = ft_bzip2_stream_io; |
stream->close = ft_bzip2_stream_close; |
|
Exit: |
return error; |
} |
|
#else /* !FT_CONFIG_OPTION_USE_BZIP2 */ |
|
FT_EXPORT_DEF( FT_Error ) |
FT_Stream_OpenBzip2( FT_Stream stream, |
FT_Stream source ) |
{ |
FT_UNUSED( stream ); |
FT_UNUSED( source ); |
|
return FT_THROW( Unimplemented_Feature ); |
} |
|
#endif /* !FT_CONFIG_OPTION_USE_BZIP2 */ |
|
|
/* END */ |