Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/lzw/ftzopen.h

Index: third_party/freetype2/src/src/lzw/ftzopen.h
diff --git a/third_party/freetype2/src/src/lzw/ftzopen.h b/third_party/freetype2/src/src/lzw/ftzopen.h
new file mode 100644
index 0000000000000000000000000000000000000000..d35e3805956582dce04a6436e37460429ad100c0
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+++ b/third_party/freetype2/src/src/lzw/ftzopen.h
@@ -0,0 +1,172 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ftzopen.h                                                              */
+/*                                                                         */
+/*    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 2005-2015 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.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+#ifndef __FT_ZOPEN_H__
+#define __FT_ZOPEN_H__
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+
+  /*
+   *  This is a complete re-implementation of the LZW file reader,
+   *  since the old one was incredibly badly written, using
+   *  400 KByte of heap memory before decompressing anything.
+   *
+   */
+
+#define FT_LZW_IN_BUFF_SIZE        64
+#define FT_LZW_DEFAULT_STACK_SIZE  64
+
+#define LZW_INIT_BITS     9
+#define LZW_MAX_BITS      16
+
+#define LZW_CLEAR         256
+#define LZW_FIRST         257
+
+#define LZW_BIT_MASK      0x1F
+#define LZW_BLOCK_MASK    0x80
+#define LZW_MASK( n )     ( ( 1U << (n) ) - 1U )
+
+
+  typedef enum  FT_LzwPhase_
+  {
+    FT_LZW_PHASE_START = 0,
+    FT_LZW_PHASE_CODE,
+    FT_LZW_PHASE_STACK,
+    FT_LZW_PHASE_EOF
+
+  } FT_LzwPhase;
+
+
+  /*
+   *  state of LZW decompressor
+   *
+   *  small technical note
+   *  --------------------
+   *
+   *  We use a few tricks in this implementation that are explained here to
+   *  ease debugging and maintenance.
+   *
+   *  - First of all, the `prefix' and `suffix' arrays contain the suffix
+   *    and prefix for codes over 256; this means that
+   *
+   *      prefix_of(code) == state->prefix[code-256]
+   *      suffix_of(code) == state->suffix[code-256]
+   *
+   *    Each prefix is a 16-bit code, and each suffix an 8-bit byte.
+   *
+   *    Both arrays are stored in a single memory block, pointed to by
+   *    `state->prefix'.  This means that the following equality is always
+   *    true:
+   *
+   *      state->suffix == (FT_Byte*)(state->prefix + state->prefix_size)
+   *
+   *    Of course, state->prefix_size is the number of prefix/suffix slots
+   *    in the arrays, corresponding to codes 256..255+prefix_size.
+   *
+   *  - `free_ent' is the index of the next free entry in the `prefix'
+   *    and `suffix' arrays.  This means that the corresponding `next free
+   *    code' is really `256+free_ent'.
+   *
+   *    Moreover, `max_free' is the maximum value that `free_ent' can reach.
+   *
+   *    `max_free' corresponds to `(1 << max_bits) - 256'.  Note that this
+   *    value is always <= 0xFF00, which means that both `free_ent' and
+   *    `max_free' can be stored in an FT_UInt variable, even on 16-bit
+   *    machines.
+   *
+   *    If `free_ent == max_free', you cannot add new codes to the
+   *    prefix/suffix table.
+   *
+   *  - `num_bits' is the current number of code bits, starting at 9 and
+   *    growing each time `free_ent' reaches the value of `free_bits'.  The
+   *    latter is computed as follows
+   *
+   *      if num_bits < max_bits:
+   *         free_bits = (1 << num_bits)-256
+   *      else:
+   *         free_bits = max_free + 1
+   *
+   *    Since the value of `max_free + 1' can never be reached by
+   *    `free_ent', `num_bits' cannot grow larger than `max_bits'.
+   */
+
+  typedef struct  FT_LzwStateRec_
+  {
+    FT_LzwPhase  phase;
+    FT_Int       in_eof;
+
+    FT_Byte      buf_tab[16];
+    FT_UInt      buf_offset;
+    FT_UInt      buf_size;
+    FT_Bool      buf_clear;
+    FT_Offset    buf_total;
+
+    FT_UInt      max_bits;    /* max code bits, from file header   */
+    FT_Int       block_mode;  /* block mode flag, from file header */
+    FT_UInt      max_free;    /* (1 << max_bits) - 256             */
+
+    FT_UInt      num_bits;    /* current code bit number */
+    FT_UInt      free_ent;    /* index of next free entry */
+    FT_UInt      free_bits;   /* if reached by free_ent, increment num_bits */
+    FT_UInt      old_code;
+    FT_UInt      old_char;
+    FT_UInt      in_code;
+
+    FT_UShort*   prefix;      /* always dynamically allocated / reallocated */
+    FT_Byte*     suffix;      /* suffix = (FT_Byte*)(prefix + prefix_size)  */
+    FT_UInt      prefix_size; /* number of slots in `prefix' or `suffix'    */
+
+    FT_Byte*     stack;       /* character stack */
+    FT_UInt      stack_top;
+    FT_Offset    stack_size;
+    FT_Byte      stack_0[FT_LZW_DEFAULT_STACK_SIZE]; /* minimize heap alloc */
+
+    FT_Stream    source;      /* source stream */
+    FT_Memory    memory;
+
+  } FT_LzwStateRec, *FT_LzwState;
+
+
+  FT_LOCAL( void )
+  ft_lzwstate_init( FT_LzwState  state,
+                    FT_Stream    source );
+
+  FT_LOCAL( void )
+  ft_lzwstate_done( FT_LzwState  state );
+
+
+  FT_LOCAL( void )
+  ft_lzwstate_reset( FT_LzwState  state );
+
+
+  FT_LOCAL( FT_ULong )
+  ft_lzwstate_io( FT_LzwState  state,
+                  FT_Byte*     buffer,
+                  FT_ULong     out_size );
+
+/* */
+
+#endif /* __FT_ZOPEN_H__ */
+
+
+/* END */