diff options
Diffstat (limited to 'src/lzw/ftzopen.c')
| -rw-r--r-- | src/lzw/ftzopen.c | 398 |
1 files changed, 0 insertions, 398 deletions
diff --git a/src/lzw/ftzopen.c b/src/lzw/ftzopen.c deleted file mode 100644 index fc78315..0000000 --- a/src/lzw/ftzopen.c +++ /dev/null @@ -1,398 +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 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_UInt old_size = state->stack_size; - FT_UInt 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 ) - { - 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 */ |