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207 |
jeremybenn |
/* Conversion loop frame work.
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Copyright (C) 1998, 1999, 2000, 2001 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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 <assert.h>
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#include <machine/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) *((__const uint16_t *) (addr))
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# define get32(addr) *((__const 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))[0] = __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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/* To make it easier for the writers of the modules, we define a macro
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to test whether we have to ignore errors. */
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#define ignore_errors_p() \
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(irreversible != NULL && (flags & __GCONV_IGNORE_ERRORS))
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/* Error handling with transliteration/transcription function use and
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ignoring of errors. Note that we cannot use the do while (0) trick
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since `break' and `continue' must reach certain points. */
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#define STANDARD_ERR_HANDLER(Incr) \
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{ \
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struct __gconv_trans_data *trans; \
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\
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result = __GCONV_ILLEGAL_INPUT; \
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\
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if (irreversible == NULL) \
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/* This means we are in call from __gconv_transliterate. In this \
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case we are not doing any error recovery outself. */ \
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break; \
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\
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/* First try the transliteration methods. */ \
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for (trans = step_data->__trans; trans != NULL; trans = trans->__next) \
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{ \
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result = trans->__trans_fct (step, step_data, trans->__data, *inptrp, \
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&inptr, inend, &outptr, irreversible); \
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if (result != __GCONV_ILLEGAL_INPUT) \
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break; \
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} \
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/* If any of them recognized the input continue with the loop. */ \
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if (result != __GCONV_ILLEGAL_INPUT) \
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continue; \
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\
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/* Next see whether we have to ignore the error. If not, stop. */ \
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if (! ignore_errors_p ()) \
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break; \
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\
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/* When we come here it means we ignore the character. */ \
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++*irreversible; \
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inptr += Incr; \
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continue; \
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}
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/* Handling of Unicode 3.1 TAG characters. Unicode recommends
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"If language codes are not relevant to the particular processing
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operation, then they should be ignored."
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This macro is usually called right before STANDARD_ERR_HANDLER (Incr). */
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#define UNICODE_TAG_HANDLER(Character, Incr) \
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{ \
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/* TAG characters are those in the range U+E0000..U+E007F. */ \
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if (((Character) >> 7) == (0xe0000 >> 7)) \
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{ \
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inptr += Incr; \
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continue; \
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} \
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}
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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) (struct __gconv_step *step,
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struct __gconv_step_data *step_data,
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const unsigned char **inptrp, const unsigned char *inend,
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unsigned char **outptrp, const unsigned char *outend,
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size_t *irreversible EXTRA_LOOP_DECLS)
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{
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#ifdef LOOP_NEED_STATE
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mbstate_t *state = step_data->__statep;
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#endif
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#ifdef LOOP_NEED_FLAGS
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int flags = step_data->__flags;
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#endif
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| 243 |
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#ifdef LOOP_NEED_DATA
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void *data = step->__data;
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#endif
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| 246 |
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int result = __GCONV_EMPTY_INPUT;
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| 247 |
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const unsigned char *inptr = *inptrp;
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| 248 |
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unsigned char *outptr = *outptrp;
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| 249 |
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| 250 |
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#ifdef INIT_PARAMS
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INIT_PARAMS;
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| 252 |
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#endif
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| 253 |
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| 254 |
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while (inptr != inend)
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| 255 |
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{
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| 256 |
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/* `if' cases for MIN_NEEDED_OUTPUT ==/!= 1 is made to help the
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| 257 |
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compiler generating better code. They will be optimized away
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| 258 |
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since MIN_NEEDED_OUTPUT is always a constant. */
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| 259 |
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if ((MIN_NEEDED_OUTPUT != 1
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| 260 |
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&& __builtin_expect (outptr + MIN_NEEDED_OUTPUT > outend, 0))
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| 261 |
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|| (MIN_NEEDED_OUTPUT == 1
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| 262 |
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&& __builtin_expect (outptr >= outend, 0)))
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| 263 |
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{
|
| 264 |
|
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/* Overflow in the output buffer. */
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| 265 |
|
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result = __GCONV_FULL_OUTPUT;
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| 266 |
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break;
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| 267 |
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}
|
| 268 |
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if (MIN_NEEDED_INPUT > 1
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| 269 |
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&& __builtin_expect (inptr + MIN_NEEDED_INPUT > inend, 0))
|
| 270 |
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{
|
| 271 |
|
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/* We don't have enough input for another complete input
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| 272 |
|
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character. */
|
| 273 |
|
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result = __GCONV_INCOMPLETE_INPUT;
|
| 274 |
|
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break;
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| 275 |
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}
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| 276 |
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| 277 |
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/* Here comes the body the user provides. It can stop with
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| 278 |
|
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RESULT set to GCONV_INCOMPLETE_INPUT (if the size of the
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| 279 |
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input characters vary in size), GCONV_ILLEGAL_INPUT, or
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| 280 |
|
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GCONV_FULL_OUTPUT (if the output characters vary in size). */
|
| 281 |
|
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BODY
|
| 282 |
|
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}
|
| 283 |
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| 284 |
|
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/* Update the pointers pointed to by the parameters. */
|
| 285 |
|
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*inptrp = inptr;
|
| 286 |
|
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*outptrp = outptr;
|
| 287 |
|
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#ifdef UPDATE_PARAMS
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| 288 |
|
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UPDATE_PARAMS;
|
| 289 |
|
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#endif
|
| 290 |
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|
| 291 |
|
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return result;
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| 292 |
|
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}
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| 293 |
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| 294 |
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| 295 |
|
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/* Include the file a second time to define the function to handle
|
| 296 |
|
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unaligned access. */
|
| 297 |
|
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#if !defined DEFINE_UNALIGNED && !defined _STRING_ARCH_unaligned \
|
| 298 |
|
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&& MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \
|
| 299 |
|
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&& MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0
|
| 300 |
|
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# undef get16
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| 301 |
|
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# undef get32
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| 302 |
|
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# undef put16
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| 303 |
|
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# undef put32
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| 304 |
|
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# undef unaligned
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| 305 |
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|
| 306 |
|
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# define DEFINE_UNALIGNED
|
| 307 |
|
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# include "loop.c"
|
| 308 |
|
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# undef DEFINE_UNALIGNED
|
| 309 |
|
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#endif
|
| 310 |
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|
| 311 |
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|
| 312 |
|
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#if MAX_NEEDED_INPUT > 1
|
| 313 |
|
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# define SINGLE(fct) SINGLE2 (fct)
|
| 314 |
|
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# define SINGLE2(fct) fct##_single
|
| 315 |
|
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static inline int
|
| 316 |
|
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SINGLE(LOOPFCT) (struct __gconv_step *step,
|
| 317 |
|
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struct __gconv_step_data *step_data,
|
| 318 |
|
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const unsigned char **inptrp, const unsigned char *inend,
|
| 319 |
|
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unsigned char **outptrp, unsigned char *outend,
|
| 320 |
|
|
size_t *irreversible EXTRA_LOOP_DECLS)
|
| 321 |
|
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{
|
| 322 |
|
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mbstate_t *state = step_data->__statep;
|
| 323 |
|
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#ifdef LOOP_NEED_FLAGS
|
| 324 |
|
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int flags = step_data->__flags;
|
| 325 |
|
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#endif
|
| 326 |
|
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#ifdef LOOP_NEED_DATA
|
| 327 |
|
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void *data = step->__data;
|
| 328 |
|
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#endif
|
| 329 |
|
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int result = __GCONV_OK;
|
| 330 |
|
|
unsigned char bytebuf[MAX_NEEDED_INPUT];
|
| 331 |
|
|
const unsigned char *inptr = *inptrp;
|
| 332 |
|
|
unsigned char *outptr = *outptrp;
|
| 333 |
|
|
size_t inlen;
|
| 334 |
|
|
|
| 335 |
|
|
#ifdef INIT_PARAMS
|
| 336 |
|
|
INIT_PARAMS;
|
| 337 |
|
|
#endif
|
| 338 |
|
|
|
| 339 |
|
|
#ifdef UNPACK_BYTES
|
| 340 |
|
|
UNPACK_BYTES
|
| 341 |
|
|
#else
|
| 342 |
|
|
/* Add the bytes from the state to the input buffer. */
|
| 343 |
|
|
for (inlen = 0; inlen < (size_t) (state->__count & 7); ++inlen)
|
| 344 |
|
|
bytebuf[inlen] = state->__value.__wchb[inlen];
|
| 345 |
|
|
#endif
|
| 346 |
|
|
|
| 347 |
|
|
/* Are there enough bytes in the input buffer? */
|
| 348 |
|
|
if (__builtin_expect (inptr + (MIN_NEEDED_INPUT - inlen) > inend, 0))
|
| 349 |
|
|
{
|
| 350 |
|
|
*inptrp = inend;
|
| 351 |
|
|
#ifdef STORE_REST
|
| 352 |
|
|
inptr = bytebuf;
|
| 353 |
|
|
inptrp = &inptr;
|
| 354 |
|
|
inend = &bytebuf[inlen];
|
| 355 |
|
|
|
| 356 |
|
|
STORE_REST
|
| 357 |
|
|
#else
|
| 358 |
|
|
/* We don't have enough input for another complete input
|
| 359 |
|
|
character. */
|
| 360 |
|
|
while (inptr < inend)
|
| 361 |
|
|
state->__value.__wchb[inlen++] = *inptr++;
|
| 362 |
|
|
#endif
|
| 363 |
|
|
|
| 364 |
|
|
return __GCONV_INCOMPLETE_INPUT;
|
| 365 |
|
|
}
|
| 366 |
|
|
|
| 367 |
|
|
/* Enough space in output buffer. */
|
| 368 |
|
|
if ((MIN_NEEDED_OUTPUT != 1 && outptr + MIN_NEEDED_OUTPUT > outend)
|
| 369 |
|
|
|| (MIN_NEEDED_OUTPUT == 1 && outptr >= outend))
|
| 370 |
|
|
/* Overflow in the output buffer. */
|
| 371 |
|
|
return __GCONV_FULL_OUTPUT;
|
| 372 |
|
|
|
| 373 |
|
|
/* Now add characters from the normal input buffer. */
|
| 374 |
|
|
do
|
| 375 |
|
|
bytebuf[inlen++] = *inptr++;
|
| 376 |
|
|
while (inlen < MAX_NEEDED_INPUT && inptr < inend);
|
| 377 |
|
|
|
| 378 |
|
|
inptr = bytebuf;
|
| 379 |
|
|
inend = &bytebuf[inlen];
|
| 380 |
|
|
|
| 381 |
|
|
do
|
| 382 |
|
|
{
|
| 383 |
|
|
BODY
|
| 384 |
|
|
}
|
| 385 |
|
|
while (0);
|
| 386 |
|
|
|
| 387 |
|
|
/* Now we either have produced an output character and consumed all the
|
| 388 |
|
|
bytes from the state and at least one more, or the character is still
|
| 389 |
|
|
incomplete, or we have some other error (like illegal input character,
|
| 390 |
|
|
no space in output buffer). */
|
| 391 |
|
|
if (__builtin_expect (inptr != bytebuf, 1))
|
| 392 |
|
|
{
|
| 393 |
|
|
/* We found a new character. */
|
| 394 |
|
|
assert (inptr - bytebuf > (state->__count & 7));
|
| 395 |
|
|
|
| 396 |
|
|
*inptrp += inptr - bytebuf - (state->__count & 7);
|
| 397 |
|
|
*outptrp = outptr;
|
| 398 |
|
|
|
| 399 |
|
|
result = __GCONV_OK;
|
| 400 |
|
|
|
| 401 |
|
|
/* Clear the state buffer. */
|
| 402 |
|
|
state->__count &= ~7;
|
| 403 |
|
|
}
|
| 404 |
|
|
else if (result == __GCONV_INCOMPLETE_INPUT)
|
| 405 |
|
|
{
|
| 406 |
|
|
/* This can only happen if we have less than MAX_NEEDED_INPUT bytes
|
| 407 |
|
|
available. */
|
| 408 |
|
|
assert (inend != &bytebuf[MAX_NEEDED_INPUT]);
|
| 409 |
|
|
|
| 410 |
|
|
*inptrp += inend - bytebuf - (state->__count & 7);
|
| 411 |
|
|
#ifdef STORE_REST
|
| 412 |
|
|
inptrp = &inptr;
|
| 413 |
|
|
|
| 414 |
|
|
STORE_REST
|
| 415 |
|
|
#else
|
| 416 |
|
|
/* We don't have enough input for another complete input
|
| 417 |
|
|
character. */
|
| 418 |
|
|
while (inptr < inend)
|
| 419 |
|
|
state->__value.__wchb[inlen++] = *inptr++;
|
| 420 |
|
|
#endif
|
| 421 |
|
|
}
|
| 422 |
|
|
|
| 423 |
|
|
return result;
|
| 424 |
|
|
}
|
| 425 |
|
|
# undef SINGLE
|
| 426 |
|
|
# undef SINGLE2
|
| 427 |
|
|
#endif
|
| 428 |
|
|
|
| 429 |
|
|
|
| 430 |
|
|
/* We remove the macro definitions so that we can include this file again
|
| 431 |
|
|
for the definition of another function. */
|
| 432 |
|
|
#undef MIN_NEEDED_INPUT
|
| 433 |
|
|
#undef MAX_NEEDED_INPUT
|
| 434 |
|
|
#undef MIN_NEEDED_OUTPUT
|
| 435 |
|
|
#undef MAX_NEEDED_OUTPUT
|
| 436 |
|
|
#undef LOOPFCT
|
| 437 |
|
|
#undef BODY
|
| 438 |
|
|
#undef LOOPFCT
|
| 439 |
|
|
#undef EXTRA_LOOP_DECLS
|
| 440 |
|
|
#undef INIT_PARAMS
|
| 441 |
|
|
#undef UPDATE_PARAMS
|
| 442 |
|
|
#undef UNPACK_BYTES
|
| 443 |
|
|
#undef LOOP_NEED_STATE
|
| 444 |
|
|
#undef LOOP_NEED_FLAGS
|
| 445 |
|
|
#undef LOOP_NEED_DATA
|
| 446 |
|
|
#undef get16
|
| 447 |
|
|
#undef get32
|
| 448 |
|
|
#undef put16
|
| 449 |
|
|
#undef put32
|
| 450 |
|
|
#undef unaligned
|
