--- a/misc/libfreetype/src/lzw/ftzopen.c Tue Jul 16 11:14:27 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,401 +0,0 @@
-/***************************************************************************/
-/* */
-/* ftzopen.c */
-/* */
-/* FreeType support for .Z compressed files. */
-/* */
-/* This optional component relies on NetBSD's zopen(). It should mainly */
-/* be used to parse compressed PCF fonts, as found with many X11 server */
-/* distributions. */
-/* */
-/* Copyright 2005, 2006, 2007, 2009 by David Turner. */
-/* */
-/* 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 "ftzopen.h"
-#include FT_INTERNAL_MEMORY_H
-#include FT_INTERNAL_STREAM_H
-#include FT_INTERNAL_DEBUG_H
-
-
- static int
- ft_lzwstate_refill( FT_LzwState state )
- {
- FT_ULong count;
-
-
- if ( state->in_eof )
- return -1;
-
- count = FT_Stream_TryRead( state->source,
- state->buf_tab,
- state->num_bits ); /* WHY? */
-
- state->buf_size = (FT_UInt)count;
- state->buf_total += count;
- state->in_eof = FT_BOOL( count < state->num_bits );
- state->buf_offset = 0;
- state->buf_size = ( state->buf_size << 3 ) - ( state->num_bits - 1 );
-
- if ( count == 0 ) /* end of file */
- return -1;
-
- return 0;
- }
-
-
- static FT_Int32
- ft_lzwstate_get_code( FT_LzwState state )
- {
- FT_UInt num_bits = state->num_bits;
- FT_Int offset = state->buf_offset;
- FT_Byte* p;
- FT_Int result;
-
-
- if ( state->buf_clear ||
- offset >= state->buf_size ||
- state->free_ent >= state->free_bits )
- {
- if ( state->free_ent >= state->free_bits )
- {
- state->num_bits = ++num_bits;
- state->free_bits = state->num_bits < state->max_bits
- ? (FT_UInt)( ( 1UL << num_bits ) - 256 )
- : state->max_free + 1;
- }
-
- if ( state->buf_clear )
- {
- state->num_bits = num_bits = LZW_INIT_BITS;
- state->free_bits = (FT_UInt)( ( 1UL << num_bits ) - 256 );
- state->buf_clear = 0;
- }
-
- if ( ft_lzwstate_refill( state ) < 0 )
- return -1;
-
- offset = 0;
- }
-
- state->buf_offset = offset + num_bits;
-
- p = &state->buf_tab[offset >> 3];
- offset &= 7;
- result = *p++ >> offset;
- offset = 8 - offset;
- num_bits -= offset;
-
- if ( num_bits >= 8 )
- {
- result |= *p++ << offset;
- offset += 8;
- num_bits -= 8;
- }
- if ( num_bits > 0 )
- result |= ( *p & LZW_MASK( num_bits ) ) << offset;
-
- return result;
- }
-
-
- /* grow the character stack */
- static int
- ft_lzwstate_stack_grow( FT_LzwState state )
- {
- if ( state->stack_top >= state->stack_size )
- {
- FT_Memory memory = state->memory;
- FT_Error error;
- FT_Offset old_size = state->stack_size;
- FT_Offset new_size = old_size;
-
- new_size = new_size + ( new_size >> 1 ) + 4;
-
- if ( state->stack == state->stack_0 )
- {
- state->stack = NULL;
- old_size = 0;
- }
-
- if ( FT_RENEW_ARRAY( state->stack, old_size, new_size ) )
- return -1;
-
- state->stack_size = new_size;
- }
- return 0;
- }
-
-
- /* grow the prefix/suffix arrays */
- static int
- ft_lzwstate_prefix_grow( FT_LzwState state )
- {
- FT_UInt old_size = state->prefix_size;
- FT_UInt new_size = old_size;
- FT_Memory memory = state->memory;
- FT_Error error;
-
-
- if ( new_size == 0 ) /* first allocation -> 9 bits */
- new_size = 512;
- else
- new_size += new_size >> 2; /* don't grow too fast */
-
- /*
- * Note that the `suffix' array is located in the same memory block
- * pointed to by `prefix'.
- *
- * I know that sizeof(FT_Byte) == 1 by definition, but it is clearer
- * to write it literally.
- *
- */
- if ( FT_REALLOC_MULT( state->prefix, old_size, new_size,
- sizeof ( FT_UShort ) + sizeof ( FT_Byte ) ) )
- return -1;
-
- /* now adjust `suffix' and move the data accordingly */
- state->suffix = (FT_Byte*)( state->prefix + new_size );
-
- FT_MEM_MOVE( state->suffix,
- state->prefix + old_size,
- old_size * sizeof ( FT_Byte ) );
-
- state->prefix_size = new_size;
- return 0;
- }
-
-
- FT_LOCAL_DEF( void )
- ft_lzwstate_reset( FT_LzwState state )
- {
- state->in_eof = 0;
- state->buf_offset = 0;
- state->buf_size = 0;
- state->buf_clear = 0;
- state->buf_total = 0;
- state->stack_top = 0;
- state->num_bits = LZW_INIT_BITS;
- state->phase = FT_LZW_PHASE_START;
- }
-
-
- FT_LOCAL_DEF( void )
- ft_lzwstate_init( FT_LzwState state,
- FT_Stream source )
- {
- FT_ZERO( state );
-
- state->source = source;
- state->memory = source->memory;
-
- state->prefix = NULL;
- state->suffix = NULL;
- state->prefix_size = 0;
-
- state->stack = state->stack_0;
- state->stack_size = sizeof ( state->stack_0 );
-
- ft_lzwstate_reset( state );
- }
-
-
- FT_LOCAL_DEF( void )
- ft_lzwstate_done( FT_LzwState state )
- {
- FT_Memory memory = state->memory;
-
-
- ft_lzwstate_reset( state );
-
- if ( state->stack != state->stack_0 )
- FT_FREE( state->stack );
-
- FT_FREE( state->prefix );
- state->suffix = NULL;
-
- FT_ZERO( state );
- }
-
-
-#define FTLZW_STACK_PUSH( c ) \
- FT_BEGIN_STMNT \
- if ( state->stack_top >= state->stack_size && \
- ft_lzwstate_stack_grow( state ) < 0 ) \
- goto Eof; \
- \
- state->stack[state->stack_top++] = (FT_Byte)(c); \
- FT_END_STMNT
-
-
- FT_LOCAL_DEF( FT_ULong )
- ft_lzwstate_io( FT_LzwState state,
- FT_Byte* buffer,
- FT_ULong out_size )
- {
- FT_ULong result = 0;
-
- FT_UInt old_char = state->old_char;
- FT_UInt old_code = state->old_code;
- FT_UInt in_code = state->in_code;
-
-
- if ( out_size == 0 )
- goto Exit;
-
- switch ( state->phase )
- {
- case FT_LZW_PHASE_START:
- {
- FT_Byte max_bits;
- FT_Int32 c;
-
-
- /* skip magic bytes, and read max_bits + block_flag */
- if ( FT_Stream_Seek( state->source, 2 ) != 0 ||
- FT_Stream_TryRead( state->source, &max_bits, 1 ) != 1 )
- goto Eof;
-
- state->max_bits = max_bits & LZW_BIT_MASK;
- state->block_mode = max_bits & LZW_BLOCK_MASK;
- state->max_free = (FT_UInt)( ( 1UL << state->max_bits ) - 256 );
-
- if ( state->max_bits > LZW_MAX_BITS )
- goto Eof;
-
- state->num_bits = LZW_INIT_BITS;
- state->free_ent = ( state->block_mode ? LZW_FIRST
- : LZW_CLEAR ) - 256;
- in_code = 0;
-
- state->free_bits = state->num_bits < state->max_bits
- ? (FT_UInt)( ( 1UL << state->num_bits ) - 256 )
- : state->max_free + 1;
-
- c = ft_lzwstate_get_code( state );
- if ( c < 0 )
- goto Eof;
-
- old_code = old_char = (FT_UInt)c;
-
- if ( buffer )
- buffer[result] = (FT_Byte)old_char;
-
- if ( ++result >= out_size )
- goto Exit;
-
- state->phase = FT_LZW_PHASE_CODE;
- }
- /* fall-through */
-
- case FT_LZW_PHASE_CODE:
- {
- FT_Int32 c;
- FT_UInt code;
-
-
- NextCode:
- c = ft_lzwstate_get_code( state );
- if ( c < 0 )
- goto Eof;
-
- code = (FT_UInt)c;
-
- if ( code == LZW_CLEAR && state->block_mode )
- {
- /* why not LZW_FIRST-256 ? */
- state->free_ent = ( LZW_FIRST - 1 ) - 256;
- state->buf_clear = 1;
- c = ft_lzwstate_get_code( state );
- if ( c < 0 )
- goto Eof;
-
- code = (FT_UInt)c;
- }
-
- in_code = code; /* save code for later */
-
- if ( code >= 256U )
- {
- /* special case for KwKwKwK */
- if ( code - 256U >= state->free_ent )
- {
- FTLZW_STACK_PUSH( old_char );
- code = old_code;
- }
-
- while ( code >= 256U )
- {
- if ( !state->prefix )
- goto Eof;
-
- FTLZW_STACK_PUSH( state->suffix[code - 256] );
- code = state->prefix[code - 256];
- }
- }
-
- old_char = code;
- FTLZW_STACK_PUSH( old_char );
-
- state->phase = FT_LZW_PHASE_STACK;
- }
- /* fall-through */
-
- case FT_LZW_PHASE_STACK:
- {
- while ( state->stack_top > 0 )
- {
- --state->stack_top;
-
- if ( buffer )
- buffer[result] = state->stack[state->stack_top];
-
- if ( ++result == out_size )
- goto Exit;
- }
-
- /* now create new entry */
- if ( state->free_ent < state->max_free )
- {
- if ( state->free_ent >= state->prefix_size &&
- ft_lzwstate_prefix_grow( state ) < 0 )
- goto Eof;
-
- FT_ASSERT( state->free_ent < state->prefix_size );
-
- state->prefix[state->free_ent] = (FT_UShort)old_code;
- state->suffix[state->free_ent] = (FT_Byte) old_char;
-
- state->free_ent += 1;
- }
-
- old_code = in_code;
-
- state->phase = FT_LZW_PHASE_CODE;
- goto NextCode;
- }
-
- default: /* state == EOF */
- ;
- }
-
- Exit:
- state->old_code = old_code;
- state->old_char = old_char;
- state->in_code = in_code;
-
- return result;
-
- Eof:
- state->phase = FT_LZW_PHASE_EOF;
- goto Exit;
- }
-
-
-/* END */