Artifact 708f092e07b6b32ad5274d6616fdb5c10fd83f3b48d627c0d2933f904370298f:
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r36/cslbase/stream.h
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2011-09-02 18:13:33
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/* stream.h Copyright (C) Codemist Ltd, 1995 */ /* * Header defining the structure of stream objects in CSL, and also * the format for "library" files used with the fast-load mechanism. */ /* Signature: 0efbd03e 07-Mar-2000 */ #ifndef header_stream_h #define header_stream_h 1 extern FILE *non_terminal_input; typedef int character_reader(void); /* used only with procedural IO */ typedef int character_writer(int); /* ditto */ typedef int character_stream_reader(Lisp_Object); typedef int character_stream_writer(int, Lisp_Object); typedef int32 other_stream_op(int32, Lisp_Object); extern Lisp_Object Lopen(Lisp_Object nil, Lisp_Object name, Lisp_Object dir); /* * The values used here are placed where characters might be, or possibly * OR'd with character codes. They are now such that even if I am using * 16-bit characters (Unicode of Kanji) all ought to be well. */ #define ESCAPED_CHAR 0x20000 #define NOT_CHAR 0x40000 extern int char_to_terminal(int c, Lisp_Object f); extern int char_to_file(int c, Lisp_Object f); extern int char_to_pipeout(int c, Lisp_Object f); extern int char_to_synonym(int c, Lisp_Object f); extern int char_to_broadcast(int c, Lisp_Object f); extern int char_to_illegal(int c, Lisp_Object f); extern int char_to_list(int c, Lisp_Object f); extern int code_to_list(int c, Lisp_Object f); extern int count_character(int c, Lisp_Object f); extern int binary_outchar(int c, Lisp_Object f); extern int char_to_function(int c, Lisp_Object f); extern int32 write_action_terminal(int32 c, Lisp_Object f); extern int32 write_action_file(int32 c, Lisp_Object f); extern int32 write_action_pipe(int32 c, Lisp_Object f); extern int32 write_action_synonym(int32 c, Lisp_Object f); extern int32 write_action_broadcast(int32 c, Lisp_Object f); extern int32 write_action_twoway(int32 c, Lisp_Object f); extern int32 write_action_illegal(int32 c, Lisp_Object f); extern int32 write_action_list(int32 c, Lisp_Object f); extern int char_from_terminal(Lisp_Object f); extern int char_from_file(Lisp_Object f); extern int char_from_synonym(Lisp_Object f); extern int char_from_concatenated(Lisp_Object f); extern int char_from_echo(Lisp_Object f); extern int char_from_illegal(Lisp_Object f); extern int char_from_list(Lisp_Object f); extern int char_from_vector(Lisp_Object f); extern int32 read_action_terminal(int32 c, Lisp_Object f); extern int32 read_action_file(int32 c, Lisp_Object f); extern int32 read_action_output_file(int32 c, Lisp_Object f); extern int32 read_action_synonym(int32 c, Lisp_Object f); extern int32 read_action_concatenated(int32 c, Lisp_Object f); extern int32 read_action_echo(int32 c, Lisp_Object f); extern int32 read_action_twoway(int32 c, Lisp_Object f); extern int32 read_action_illegal(int32 c, Lisp_Object f); extern int32 read_action_list(int32 c, Lisp_Object f); extern int32 read_action_vector(int32 c, Lisp_Object f); extern char memory_print_buffer[32]; /* * The following typedef shows the expected layout of a Lisp_STREAM object, * but it is not used directly because I need to insist that each field is * exactly 4 bytes wide. Thus when I access things that contain pointers I * will perform horrible casts. This is essential if I am to be able to host * this system on certain 64-bit systems. * * typedef struct Lisp_STREAM * { * Header h; * Lisp_Object type; * Lisp_Object write_data; * Lisp_Object read_data; * FILE *file; * character_stream_writer *write_fn; * other_stream_op *write_other_fn; * int32 line_length; * int32 char_pos; * character_stream_reader *read_fn; * other_stream_op *read_other_fn; * int32 pushed_char; * } Lisp_STREAM; */ #define STREAM_SIZE 48L #define stream_type(v) elt(v, 0) #define stream_write_data(v) elt(v, 1) #define stream_read_data(v) elt(v, 2) #define stream_file(v) ((FILE *)elt(v, 3)) #define stream_write_fn(v) ((character_stream_writer *)elt(v, 4)) #define stream_write_other(v) ((other_stream_op *)elt(v,5)) #define stream_line_length(v) elt(v, 6) #define stream_char_pos(v) elt(v, 7) #define stream_read_fn(v) ((character_stream_reader *)elt(v, 8)) #define stream_read_other(v) ((other_stream_op *)elt(v,9)) #define stream_pushed_char(v) elt(v, 10) #define set_stream_file(v, x) (elt(v, 3) = (Lisp_Object)(x)) #define set_stream_write_fn(v, x) (elt(v, 4) = (Lisp_Object)(x)) #define set_stream_write_other(v, x) (elt(v, 5) = (Lisp_Object)(x)) #define set_stream_read_fn(v, x) (elt(v, 8) = (Lisp_Object)(x)) #define set_stream_read_other(v, x) (elt(v, 9) = (Lisp_Object)(x)) #define STREAM_HEADER (TAG_ODDS + TYPE_STREAM + (STREAM_SIZE<<10)) #define STREAM_FLAG_PIPE 1 #define is_stream(v) (is_vector(v) && vechdr(v) == STREAM_HEADER) #ifdef DEBUG #define putc_stream(c, f) (!is_stream(f) || stream_write_fn(f)==0 ? term_printf("putc %s %d\n", \ __FILE__, __LINE__), ensure_screen(), my_exit(1), 0 : \ stream_write_fn(f)(c, f)) #define getc_stream(f) (!is_stream(f) || stream_read_fn(f)==0 ? term_printf("putc %s %d\n", \ __FILE__, __LINE__), ensure_screen(), my_exit(1), 0 : \ stream_read_fn(f)(f)) #define other_write_action(c, f) (!is_stream(f) || stream_write_other(f)==0 ? term_printf("putc %s %d\n", \ __FILE__, __LINE__), ensure_screen(), my_exit(1), 0 : \ stream_write_other(f)(c, f)) #define other_read_action(c, f) (!is_stream(f) || stream_read_other(f)==0 ? term_printf("putc %s %d\n", \ __FILE__, __LINE__), ensure_screen(), my_exit(1), 0 : \ stream_read_other(f)(c, f)) #else #define putc_stream(c, f) (stream_write_fn(f)(c, f)) #define getc_stream(f) (stream_read_fn(f)(f)) #define other_write_action(c, f) (stream_write_other(f)(c, f)) #define other_read_action(c, f) (stream_read_other(f)(c, f)) #endif /* * For other_write_action if the top four bits of the operand select an * action to be performed, while the remaining 28 are available to pass * an operand. */ #define WRITE_GET_INFO 0x00000000 # define WRITE_GET_LINE_LENGTH 0 # define WRITE_GET_COLUMN 1 # define WRITE_IS_CONSOLE 2 #define WRITE_CLOSE 0x10000000 #define WRITE_FLUSH 0x20000000 #define WRITE_SET_LINELENGTH 0x30000000 #define WRITE_SET_COLUMN 0x40000000 #define WRITE_SET_LINELENGTH_DEFAULT 0x50000000 /* * For other_read_action() if the operand is in the range -1 to 65535 then * it is a character to be unread (-1 is used for EOF). Otherwise if the most * significant bit is a "1" then the request is a seek (with a 31-bit address * within the stream to go to). The remaining few cases are things that do * not need additional data passed. */ #define READ_SEEK 0x80000000 #define READ_TELL 0x00010000 #define READ_CLOSE 0x00010001 #define READ_FLUSH 0x00010002 #define READ_IS_CONSOLE 0x00010003 #define READ_END 0x00010004 extern Lisp_Object make_stream_handle(void); extern CSLbool use_wimp, sigint_must_longjmp; extern jmp_buf sigint_buf; extern character_reader *procedural_input; extern character_writer *procedural_output; /* * This version of the directory structure can cope with up to 2047 * modules in any single library. */ #if defined DEMO_BUILD || defined DEMO_MODE #define IMAGE_FORMAT_VERSION 'd' #else #define IMAGE_FORMAT_VERSION '4' #endif #ifndef DIRECTORY_SIZE # define DIRECTORY_SIZE 8 /* Initial directory size */ #endif typedef struct directory_header { char C, S, L, version; /* Identification */ unsigned char dirext, /* Extra bits for dirused, dirsize */ dirsize, /* Number of directory entries provided */ dirused, /* Number currently in use */ updated; /* In need of compaction & other flags */ char eof[4]; /* fseek/ftell location of end of file */ } directory_header; #define get_dirused(d) ((int)((d).dirused + (((d).dirext & 0x0f)<<8))) #define get_dirsize(d) ((int)((d).dirsize + (((d).dirext & 0xf0)<<4))) typedef struct directory_entry { char data[44]; /* char newline; * Makes file easier to read as a text file! * * but also used to indicate encryption * char name[12]; * blank padded to 12 characters * * but with special rules for root image etc * char date[24]; char position[4]; * Machine byte-order insensitive format * char size[3]; * Ditto * */ } directory_entry; /* * I use these macros rather than just the structure definition shown above * so that the behaviour of the code is not sensitive to attempts by a C * compiler to align things for me. Think C 5.0 on the Macintosh (and * probably many other C compilers) put padder bytes in the original * structure to give word-alignment. */ #define D_newline data[0] #define D_name data[1] #define D_space data[12] #define D_date data[13] #define D_position data[37] #define D_size data[41] #define name_size 12 #define date_size 24 #define DIRNAME_LENGTH 64 #define NEWLINE_CHAR 0x0a /* * The D_newline location in a directory originally held a newline, * because doing so resulted in image files baing a little bit easier * to interpret when looked at with a simple text editor. But then * it turned out that the C value `\n' was not the same on all computers, * and so I used a literal hex value 0x0a instead, expecting it to * be the same as '\n' on "most" systems. Yet later I wanted a backwards- * compatible way to extend dierctory entries to indicate that some files * are stored encrypted. The route follows is that unencrypted files * have NEWLINE_CHAR in the D_newline position, while values that + n * indicate files encrypted with key number n. Note that if I try to * read an encrypted sub-file but my key is wrong I will just get garbage * bytes back, so all code that handles files from the image will need * to be prepared to respond tolerably gracefully to such a situation. * I already have a CRC check at the end of every sub-file, but often * that will be too late, and anyway I may need to review that to ensure that * it actually checksums the plain-text not the cipher text. */ typedef struct directory { directory_header h; FILE *f; char filename[DIRNAME_LENGTH]; directory_entry d[1]; /* Will usually have many more entries */ } directory; #ifdef COMMON # define MIDDLE_INITIAL 'C' #else # define MIDDLE_INITIAL 'S' #endif /* * Flags for the UPDATED field */ #define D_WRITE_OK 1 #define D_UPDATED 2 #define D_COMPACT 4 #define D_PENDING 8 extern directory *fasl_files[MAX_FASL_PATHS]; extern directory *open_pds(char *name, CSLbool forinput); extern CSLbool finished_with(int h); #endif /* header_stream_h */ /* end of stream.h */