home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1995, 1996, 1997 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* gxclmem.h */
- /* Definitions and declarations for clist implementation in memory. */
- #include "gxclio.h" /* defines interface */
- #include "strimpl.h" /* stream structures */
-
- /*
- * The best values of MEMFILE_DATA_SIZE are slightly less than a power of 2,
- * to allow typical malloc implementations to allocate in units of a power
- * of 2 rather than having to go slightly over.
- */
- #define MEMFILE_DATA_SIZE (16384 - 160)
-
- /* ============================================================ */
- /* */
- /* Memfile structure definitions. */
- /* */
- /* The PHYS structures are the elements actually allocated in */
- /* RAM, containing the compressed data (or optionally raw data) */
- /* */
- /* There can be several LOG (logical) elements per physical */
- /* element, depending on the compression. The MEMFILE pdata */
- /* item always points into a raw block of data. */
- /* */
- /* ============================================================ */
-
- typedef struct RAW_BUFFER {
- struct RAW_BUFFER *fwd, *back;
- struct LOG_MEMFILE_BLK *log_blk;
- char data[MEMFILE_DATA_SIZE];
- } RAW_BUFFER ;
-
- typedef struct PHYS_MEMFILE_BLK {
- struct PHYS_MEMFILE_BLK *link;
- char *data_limit; /* end of data when compressed */
- /* NULL if not compressed */
- char data_spare[4]; /* used during de-compress */
- char data[MEMFILE_DATA_SIZE];
- } PHYS_MEMFILE_BLK ;
-
- typedef struct LOG_MEMFILE_BLK {
- struct LOG_MEMFILE_BLK *link;
- PHYS_MEMFILE_BLK *phys_blk;
- char *phys_pdata;
- RAW_BUFFER *raw_block; /* or NULL */
- } LOG_MEMFILE_BLK ;
-
- typedef struct MEMFILE {
- gs_memory_t *memory; /* storage allocator */
- gs_memory_t *data_memory; /* storage allocator for data */
- bool ok_to_compress; /* if true, OK to compress this file */
- /* logical file properties */
- LOG_MEMFILE_BLK *log_head;
- LOG_MEMFILE_BLK *log_curr_blk;
- long log_length; /* updated during write */
- long log_curr_pos; /* updated during seek, close, read */
- char *pdata; /* raw data */
- char *pdata_end;
- /* physical file properties */
- long total_space; /* so we know when to start compress */
- PHYS_MEMFILE_BLK *phys_curr; /* NULL if not compressing */
- RAW_BUFFER *raw_head, *raw_tail;
- int error_code; /* used by CLIST_ferror */
- stream_cursor_read rd; /* use .ptr, .limit */
- stream_cursor_write wt; /* use .ptr, .limit */
- bool compressor_initialized;
- stream_state *compress_state;
- stream_state *decompress_state;
- } MEMFILE ;
-
- /*
- Only the MEMFILE structure is GC-compatible, so we allocate all the
- other structures on the C heap.
- */
-
- #define private_st_MEMFILE() /* in gxclmem.c */\
- gs_private_st_ptrs2(st_MEMFILE, MEMFILE, "MEMFILE",\
- MEMFILE_enum_ptrs, MEMFILE_reloc_ptrs, compress_state, decompress_state)
-
- #define USE_C_HEAP_FOR_DATA
-
- /* Make the memfile_... operations aliases for the clist_... operations. */
-
- #define memfile_fopen(fname, fmode, pcf, mem, compress)\
- clist_fopen(fname, fmode, pcf, mem, compress)
- #define memfile_fclose(cf, fname, delete)\
- clist_fclose(cf, fname, delete)
- #define memfile_unlink(fname)\
- clist_unlink(fname)
-
- #define memfile_space_available(req)\
- clist_space_available(req)
- #define memfile_fwrite_chars(data, len, cf)\
- clist_fwrite_chars(data, len, cf)
-
- #define memfile_fread_chars(data, len, cf)\
- clist_fread_chars(data, len, cf)
-
- #define memfile_ferror_code(cf) clist_ferror_code(cf)
- #define memfile_ftell(cf) clist_ftell(cf)
- #define memfile_rewind(cf, discard, fname) clist_rewind(cf, discard, fname)
- #define memfile_fseek(cf, offset, mode, fname) clist_fseek(cf, offset, mode, fname)
-
- /* Declare the procedures for returning the prototype filter states */
- /* for compressing and decompressing the band list. */
- const stream_state *clist_compressor_state(P1(void *));
- const stream_state *clist_decompressor_state(P1(void *));
-