ref: 026bd17b4138fda38885db9c3986b560072c6c02
dir: /src/type1/t1tokens.h/
/*******************************************************************
*
* t1tokens.h
*
* Type 1 tokenizer
*
* Copyright 1996 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.
*
* The tokenizer is in charge of loading and reading a Type1 font
* file (either in PFB or PFA format), and extract successive tokens
* and keywords from its two streams (i.e. the font program, and the
* private dictionary).
*
* Eexec decryption is performed automatically when entering the
* private dictionary, or when retrieving char strings..
*
******************************************************************/
#ifndef T1TOKENS_H
#define T1TOKENS_H
#include <t1objs.h>
/* enum value of first keyword */
#define key_first_ 100
/* enum value of first immediate name */
#define imm_first_ 200
typedef enum T1_TokenType_
{
tok_error = 0,
tok_eof, /* end of file */
/* simple token types */
tok_keyword, /* keyword */
tok_number, /* number (integer or real) */
tok_string, /* postscript string */
tok_program, /* postscript program */
tok_immediate, /* any immediate name */
tok_array, /* matrix, array, etc.. */
tok_hexarray, /* array of hexadecimal nibbles */
tok_any, /* anything else */
/* Postscript keywords - placed in lexicographical order */
key_RD_alternate = key_first_, /* "-|" = alternate form of RD */
key_ExpertEncoding,
key_ND,
key_NP,
key_RD,
key_StandardEncoding,
key_array,
key_begin,
key_closefile,
key_currentdict,
key_currentfile,
key_def,
key_dict,
key_dup,
key_eexec,
key_end,
key_execonly,
key_false,
key_for,
key_index,
key_noaccess,
key_put,
key_readonly,
key_true,
key_userdict,
key_NP_alternate, /* "|" = alternate form of NP */
key_ND_alternate, /* "|-" = alternate form of ND */
key_max, /* always keep this value there */
/* Postscript immediate names - other names will be ignored, except */
/* in charstrings.. */
imm_RD_alternate = imm_first_, /* "-|" = alternate form of RD */
imm_notdef, /* "/.notdef" immediate */
imm_BlendAxisTypes,
imm_BlueFuzz,
imm_BlueScale,
imm_BlueShift,
imm_BlueValues,
imm_CharStrings,
imm_Encoding,
imm_FamilyBlues,
imm_FamilyName,
imm_FamilyOtherBlues,
imm_FID,
imm_FontBBox,
imm_FontID,
imm_FontInfo,
imm_FontMatrix,
imm_FontName,
imm_FontType,
imm_ForceBold,
imm_FullName,
imm_ItalicAngle,
imm_LanguageGroup,
imm_Metrics,
imm_MinFeature,
imm_ND,
imm_NP,
imm_Notice,
imm_OtherBlues,
imm_OtherSubrs,
imm_PaintType,
imm_Private,
imm_RD,
imm_RndStemUp,
imm_StdHW,
imm_StdVW,
imm_StemSnapH,
imm_StemSnapV,
imm_StrokeWidth,
imm_Subrs,
imm_UnderlinePosition,
imm_UnderlineThickness,
imm_UniqueID,
imm_Weight,
imm_isFixedPitch,
imm_lenIV,
imm_password,
imm_version,
imm_NP_alternate, /* "|" = alternate form of NP */
imm_ND_alternate, /* "|-" = alternate form of ND */
imm_max /* always keep this value here */
} T1_TokenType;
/* these arrays are visible for debugging purposes.. */
extern const char* t1_keywords[];
extern const char* t1_immediates[];
/*************************************************************************/
/* */
/* <Struct> T1_Token */
/* */
/* <Description> */
/* A structure used to describe a token in the current input */
/* stream. Note that the Type1 driver doesn't try to interpret */
/* tokens until it really needs to.. */
/* */
/* <Fields> */
/* kind :: token type. Describes the token to the loader */
/* kind2 :: detailed token type. */
/* */
/* start :: index of first character of token in input stream */
/* */
/* len :: length of token in characters. */
/* */
typedef struct T1_Token_
{
T1_TokenType kind; /* simple type */
T1_TokenType kind2; /* detailed type */
T1_Int start; /* index of first token character */
T1_Int len; /* length of token in chars */
} T1_Token;
typedef struct T1_TokenParser_
{
FT_Memory memory;
FT_Stream stream;
T1_Bool in_pfb; /* true if PFB file, PFA otherwise */
T1_Bool in_private; /* true if in private dictionary */
T1_Byte* base; /* base address of current read buffer */
T1_Long cursor; /* current position in read buffer */
T1_Long limit; /* limit of current read buffer */
T1_Long max; /* maximum size of read buffer */
T1_Error error; /* last error */
T1_Token token; /* last token read */
} T1_TokenParser;
/*************************************************************************/
/* */
/* <Type> T1_Tokenizer */
/* */
/* <Description> */
/* A handle to an object used to extract tokens from the input. */
/* The object is able to perform PFA/PFB recognition, eexec */
/* decryption of the private dictionary, as well as eexec decryption */
/* of the charstrings.. */
/* */
typedef T1_TokenParser* T1_Tokenizer;
/*************************************************************************/
/* */
/* <Function> New_Tokenizer */
/* */
/* <Description> */
/* Creates a new tokenizer from a given input stream. This function */
/* automatically recognizes "pfa" or "pfb" files. The function */
/* "Read_Token" can then be used to extract successive tokens from */
/* the stream.. */
/* */
/* <Input> */
/* stream :: input stream */
/* */
/* <Output> */
/* tokenizer :: handle to new tokenizer object.. */
/* */
/* <Return> */
/* Type1 error code. 0 means success.. */
/* */
/* <Note> */
/* This function copies the stream handle within the object. Callers */
/* should not discard "stream". This is done by the Done_Tokenizer */
/* function.. */
/* */
LOCAL_DEF
T1_Error New_Tokenizer( FT_Stream stream,
T1_Tokenizer* tokenizer );
/*************************************************************************/
/* */
/* <Function> Done_Tokenizer */
/* */
/* <Description> */
/* Closes a given tokenizer. This function will also close the */
/* stream embedded in the object.. */
/* */
/* <Input> */
/* tokenizer :: target tokenizer object */
/* */
/* <Return> */
/* Type1 error code. 0 means success.. */
/* */
LOCAL_DEF
T1_Error Done_Tokenizer( T1_Tokenizer tokenizer );
/*************************************************************************/
/* */
/* <Function> Open_PrivateDict */
/* */
/* <Description> */
/* This function must be called to set the tokenizer to the private */
/* section of the Type1 file. It recognizes automatically the */
/* the kind of eexec encryption used (ascii or binary).. */
/* */
/* <Input> */
/* tokenizer :: target tokenizer object */
/* lenIV :: value of the "lenIV" variable.. */
/* */
/* <Return> */
/* Type1 error code. 0 means success.. */
/* */
LOCAL_DEF
T1_Error Open_PrivateDict( T1_Tokenizer tokenizer );
/*************************************************************************/
/* */
/* <Function> Read_Token */
/* */
/* <Description> */
/* Read a new token from the current input stream. This function */
/* extracts a token from the font program until "Open_PrivateDict" */
/* has been called. After this, it returns tokens from the */
/* (eexec-encrypted) private dictionnary.. */
/* */
/* <Input> */
/* tokenizer :: target tokenizer object */
/* */
/* <Return> */
/* Type1 error code. 0 means success.. */
/* */
/* <Note> */
/* One should use the function Read_CharStrings to read the binary */
/* charstrings from the private dict.. */
/* */
LOCAL_DEF
T1_Error Read_Token( T1_Tokenizer tokenizer );
#if 0
/*************************************************************************/
/* */
/* <Function> Read_CharStrings */
/* */
/* <Description> */
/* Read a charstrings from the current input stream. These are */
/* binary bytes that encode each individual glyph outline. */
/* */
/* <Input> */
/* tokenizer :: target tokenizer object */
/* num_chars :: number of binary bytes to read */
/* */
/* <Output> */
/* buffer :: target array of bytes. These are eexec-decrypted.. */
/* */
/* <Return> */
/* Type1 error code. 0 means success.. */
/* */
/* <Note> */
/* One should use the function Read_CharStrings to read the binary */
/* charstrings from the private dict.. */
/* */
LOCAL_DEF
T1_Error Read_CharStrings( T1_Tokenizer tokenizer,
T1_Int num_chars,
T1_Byte* buffer );
#endif
/*************************************************************************/
/* */
/* <Function> t1_decrypt */
/* */
/* <Description> */
/* Performs the Type 1 charstring decryption process.. */
/* */
/* <Input> */
/* buffer :: base address of data to decrypt */
/* length :: number of bytes to decrypt from base address */
/* seed :: ecnryption seed (4330 for charstrings). */
/* */
LOCAL_DEF
void t1_decrypt( T1_Byte* buffer,
T1_Int length,
T1_UShort seed );
#endif /* T1TOKENS_H */