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293 lines
9.5 KiB
C
293 lines
9.5 KiB
C
/* Conversion loop frame work.
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Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This file provides a frame for the reader loop in all conversion modules.
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The actual code must (of course) be provided in the actual module source
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code but certain actions can be written down generically, with some
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customization options which are these:
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MIN_NEEDED_INPUT minimal number of input bytes needed for the next
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conversion.
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MIN_NEEDED_OUTPUT minimal number of bytes produced by the next round
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of conversion.
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MAX_NEEDED_INPUT you guess it, this is the maximal number of input
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bytes needed. It defaults to MIN_NEEDED_INPUT
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MAX_NEEDED_OUTPUT likewise for output bytes.
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LOOPFCT name of the function created. If not specified
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the name is `loop' but this prevents the use
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of multiple functions in the same file.
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BODY this is supposed to expand to the body of the loop.
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The user must provide this.
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EXTRA_LOOP_DECLS extra arguments passed from converion loop call.
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INIT_PARAMS code to define and initialize variables from params.
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UPDATE_PARAMS code to store result in params.
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*/
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#include <endian.h>
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#include <gconv.h>
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#include <stdint.h>
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#include <string.h>
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#include <wchar.h>
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#include <sys/param.h> /* For MIN. */
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#define __need_size_t
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#include <stddef.h>
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/* We have to provide support for machines which are not able to handled
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unaligned memory accesses. Some of the character encodings have
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representations with a fixed width of 2 or 4 bytes. But if we cannot
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access unaligned memory we still have to read byte-wise. */
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#undef FCTNAME2
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#if defined _STRING_ARCH_unaligned || !defined DEFINE_UNALIGNED
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/* We can handle unaligned memory access. */
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# define get16(addr) *((uint16_t *) (addr))
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# define get32(addr) *((uint32_t *) (addr))
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/* We need no special support for writing values either. */
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# define put16(addr, val) *((uint16_t *) (addr)) = (val)
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# define put32(addr, val) *((uint32_t *) (addr)) = (val)
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# define FCTNAME2(name) name
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#else
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/* Distinguish between big endian and little endian. */
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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# define get16(addr) \
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(((__const unsigned char *) (addr))[1] << 8 \
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| ((__const unsigned char *) (addr))[0])
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# define get32(addr) \
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(((((__const unsigned char *) (addr))[3] << 8 \
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| ((__const unsigned char *) (addr))[2]) << 8 \
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| ((__const unsigned char *) (addr))[1]) << 8 \
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| ((__const unsigned char *) (addr))[0])
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# define put16(addr, val) \
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({ uint16_t __val = (val); \
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((unsigned char *) (addr))[0] = __val; \
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((unsigned char *) (addr))[1] = __val >> 8; \
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(void) 0; })
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# define put32(addr, val) \
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({ uint32_t __val = (val); \
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((unsigned char *) (addr))[0] = __val; \
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__val >>= 8; \
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((unsigned char *) (addr))[1] = __val; \
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__val >>= 8; \
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((unsigned char *) (addr))[2] = __val; \
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__val >>= 8; \
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((unsigned char *) (addr))[3] = __val; \
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(void) 0; })
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# else
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# define get16(addr) \
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(((__const unsigned char *) (addr))[0] << 8 \
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| ((__const unsigned char *) (addr))[1])
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# define get32(addr) \
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(((((__const unsigned char *) (addr))[0] << 8 \
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| ((__const unsigned char *) (addr))[1]) << 8 \
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| ((__const unsigned char *) (addr))[2]) << 8 \
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| ((__const unsigned char *) (addr))[3])
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# define put16(addr, val) \
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({ uint16_t __val = (val); \
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((unsigned char *) (addr))[1] = __val; \
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((unsigned char *) (addr))[2] = __val >> 8; \
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(void) 0; })
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# define put32(addr, val) \
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({ uint32_t __val = (val); \
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((unsigned char *) (addr))[3] = __val; \
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__val >>= 8; \
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((unsigned char *) (addr))[2] = __val; \
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__val >>= 8; \
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((unsigned char *) (addr))[1] = __val; \
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__val >>= 8; \
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((unsigned char *) (addr))[0] = __val; \
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(void) 0; })
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# endif
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# define FCTNAME2(name) name##_unaligned
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#endif
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#define FCTNAME(name) FCTNAME2(name)
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/* We need at least one byte for the next round. */
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#ifndef MIN_NEEDED_INPUT
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# error "MIN_NEEDED_INPUT definition missing"
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#endif
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/* Let's see how many bytes we produce. */
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#ifndef MAX_NEEDED_INPUT
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# define MAX_NEEDED_INPUT MIN_NEEDED_INPUT
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#endif
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/* We produce at least one byte in the next round. */
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#ifndef MIN_NEEDED_OUTPUT
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# error "MIN_NEEDED_OUTPUT definition missing"
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#endif
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/* Let's see how many bytes we produce. */
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#ifndef MAX_NEEDED_OUTPUT
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# define MAX_NEEDED_OUTPUT MIN_NEEDED_OUTPUT
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#endif
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/* Default name for the function. */
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#ifndef LOOPFCT
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# define LOOPFCT loop
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#endif
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/* Make sure we have a loop body. */
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#ifndef BODY
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# error "Definition of BODY missing for function" LOOPFCT
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#endif
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/* If no arguments have to passed to the loop function define the macro
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as empty. */
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#ifndef EXTRA_LOOP_DECLS
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# define EXTRA_LOOP_DECLS
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#endif
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/* The function returns the status, as defined in gconv.h. */
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static inline int
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FCTNAME (LOOPFCT) (const unsigned char **inptrp, const unsigned char *inend,
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unsigned char **outptrp, unsigned char *outend,
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mbstate_t *state, void *data, size_t *converted
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EXTRA_LOOP_DECLS)
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{
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int result = __GCONV_OK;
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const unsigned char *inptr = *inptrp;
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unsigned char *outptr = *outptrp;
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/* We run one loop where we avoid checks for underflow/overflow of the
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buffers to speed up the conversion a bit. */
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size_t min_in_rounds = (inend - inptr) / MAX_NEEDED_INPUT;
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size_t min_out_rounds = (outend - outptr) / MAX_NEEDED_OUTPUT;
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size_t min_rounds = MIN (min_in_rounds, min_out_rounds);
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#ifdef INIT_PARAMS
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INIT_PARAMS;
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#endif
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#undef NEED_LENGTH_TEST
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#define NEED_LENGTH_TEST 0
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while (min_rounds-- > 0)
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{
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/* Here comes the body the user provides. It can stop with RESULT
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set to GCONV_INCOMPLETE_INPUT (if the size of the input characters
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vary in size), GCONV_ILLEGAL_INPUT, or GCONV_FULL_OUTPUT (if the
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output characters vary in size. */
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BODY
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}
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if (result == __GCONV_OK)
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{
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#if MIN_NEEDED_INPUT == MAX_NEEDED_INPUT \
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&& MIN_NEEDED_OUTPUT == MAX_NEEDED_OUTPUT
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/* We don't need to start another loop since we were able to determine
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the maximal number of characters to copy in advance. What remains
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to be determined is the status. */
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if (inptr == inend)
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/* No more input. */
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result = __GCONV_EMPTY_INPUT;
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else if ((MIN_NEEDED_OUTPUT != 1 && outptr + MIN_NEEDED_OUTPUT > outend)
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|| (MIN_NEEDED_OUTPUT == 1 && outptr >= outend))
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/* Overflow in the output buffer. */
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result = __GCONV_FULL_OUTPUT;
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else
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/* We have something left in the input buffer. */
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result = __GCONV_INCOMPLETE_INPUT;
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#else
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result = __GCONV_EMPTY_INPUT;
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# undef NEED_LENGTH_TEST
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# define NEED_LENGTH_TEST 1
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while (inptr != inend)
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{
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/* `if' cases for MIN_NEEDED_OUTPUT ==/!= 1 is made to help the
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compiler generating better code. It will optimized away
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since MIN_NEEDED_OUTPUT is always a constant. */
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if ((MIN_NEEDED_OUTPUT != 1 && outptr + MIN_NEEDED_OUTPUT > outend)
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|| (MIN_NEEDED_OUTPUT == 1 && outptr >= outend))
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{
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/* Overflow in the output buffer. */
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result = __GCONV_FULL_OUTPUT;
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break;
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}
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if (MIN_NEEDED_INPUT > 1 && inptr + MIN_NEEDED_INPUT > inend)
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{
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/* We don't have enough input for another complete input
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character. */
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result = __GCONV_INCOMPLETE_INPUT;
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break;
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}
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/* Here comes the body the user provides. It can stop with
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RESULT set to GCONV_INCOMPLETE_INPUT (if the size of the
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input characters vary in size), GCONV_ILLEGAL_INPUT, or
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GCONV_FULL_OUTPUT (if the output characters vary in size). */
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BODY
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}
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#endif /* Input and output charset are not both fixed width. */
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}
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/* Update the pointers pointed to by the parameters. */
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*inptrp = inptr;
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*outptrp = outptr;
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#ifdef UPDATE_PARAMS
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UPDATE_PARAMS;
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#endif
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return result;
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}
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#undef get16
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#undef get32
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#undef put16
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#undef put32
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#undef unaligned
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/* Include the file a second time to define the function to define the
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function to handle unaligned access. */
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#if !defined DEFINE_UNALIGNED && !defined _STRING_ARCH_unaligned \
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&& MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \
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&& MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0
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# define DEFINE_UNALIGNED
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# include "loop.c"
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# undef DEFINE_UNALIGNED
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#endif
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/* We remove the macro definitions so that we can include this file again
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for the definition of another function. */
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#undef MIN_NEEDED_INPUT
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#undef MAX_NEEDED_INPUT
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#undef MIN_NEEDED_OUTPUT
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#undef MAX_NEEDED_OUTPUT
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#undef LOOPFCT
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#undef BODY
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#undef LOOPFCT
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#undef EXTRA_LOOP_DECLS
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#undef INIT_PARAMS
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#undef UPDATE_PARAMS
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