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Diffstat (limited to 'nylsf/strings.c')
| -rw-r--r-- | nylsf/strings.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/nylsf/strings.c b/nylsf/strings.c new file mode 100644 index 0000000..2433f9b --- /dev/null +++ b/nylsf/strings.c @@ -0,0 +1,204 @@ +/* +** Copyright (C) 2001-2004 Erik de Castro Lopo <erikd@mega-nerd.com> +** +** This program is free software; you can redistribute it and/or modify +** it under the terms of the GNU Lesser General Public License as published by +** the Free Software Foundation; either version 2.1 of the License, or +** (at your option) any later version. +** +** This program is distributed in the hope that it will be useful, +** but WITHOUT ANY WARRANTY; without even the implied warranty of +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +** GNU Lesser General Public License for more details. +** +** You should have received a copy of the GNU Lesser General Public License +** along with this program; if not, write to the Free Software +** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +#include "sfconfig.h" + +#include <stdio.h> +#include <string.h> +#include <math.h> + +#include "sndfile.h" +#include "common.h" + +#define STRINGS_DEBUG 0 +#if STRINGS_DEBUG +static void hexdump (void *data, int len) ; +#endif + +int +psf_store_string (SF_PRIVATE *psf, int str_type, const char *str) +{ static char lsf_name [] = PACKAGE "-" VERSION ; + static char bracket_name [] = " (" PACKAGE "-" VERSION ")" ; + int k, str_len, len_remaining, str_flags ; + + if (str == NULL) + return SFE_STR_BAD_STRING ; + + str_len = strlen (str) ; + + /* A few extra checks for write mode. */ + if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR) + { if ((psf->str_flags & SF_STR_ALLOW_START) == 0) + return SFE_STR_NO_SUPPORT ; + if ((psf->str_flags & SF_STR_ALLOW_END) == 0) + return SFE_STR_NO_SUPPORT ; + /* Only allow zero length strings for software. */ + if (str_type != SF_STR_SOFTWARE && str_len == 0) + return SFE_STR_BAD_STRING ; + } ; + + /* Determine flags */ + str_flags = SF_STR_LOCATE_START ; + if (psf->have_written) + { if ((psf->str_flags & SF_STR_ALLOW_END) == 0) + return SFE_STR_NO_ADD_END ; + str_flags = SF_STR_LOCATE_END ; + } ; + + /* Find next free slot in table. */ + for (k = 0 ; k < SF_MAX_STRINGS ; k++) + if (psf->strings [k].type == 0) + break ; + + /* More sanity checking. */ + if (k >= SF_MAX_STRINGS) + return SFE_STR_MAX_COUNT ; + + if (k == 0 && psf->str_end != NULL) + { psf_log_printf (psf, "SFE_STR_WEIRD : k == 0 && psf->str_end != NULL\n") ; + return SFE_STR_WEIRD ; + } ; + + if (k != 0 && psf->str_end == NULL) + { psf_log_printf (psf, "SFE_STR_WEIRD : k != 0 && psf->str_end == NULL\n") ; + return SFE_STR_WEIRD ; + } ; + + /* Special case for the first string. */ + if (k == 0) + psf->str_end = psf->str_storage ; + + +#if STRINGS_DEBUG + psf_log_printf (psf, "str_storage : %X\n", (int) psf->str_storage) ; + psf_log_printf (psf, "str_end : %X\n", (int) psf->str_end) ; + psf_log_printf (psf, "sizeof (str_storage) : %d\n", SIGNED_SIZEOF (psf->str_storage)) ; +#endif + + len_remaining = SIGNED_SIZEOF (psf->str_storage) - (psf->str_end - psf->str_storage) ; + + if (len_remaining < str_len + 2) + return SFE_STR_MAX_DATA ; + + switch (str_type) + { case SF_STR_SOFTWARE : + /* In write mode, want to append libsndfile-version to string. */ + if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR) + { psf->strings [k].type = str_type ; + psf->strings [k].str = psf->str_end ; + psf->strings [k].flags = str_flags ; + + memcpy (psf->str_end, str, str_len + 1) ; + psf->str_end += str_len ; + + /* + ** If the supplied string does not already contain a + ** libsndfile-X.Y.Z component, then add it. + */ + if (strstr (str, PACKAGE) == NULL && len_remaining > (int) (strlen (bracket_name) + str_len + 2)) + { if (strlen (str) == 0) + strncat (psf->str_end, lsf_name, len_remaining) ; + else + strncat (psf->str_end, bracket_name, len_remaining) ; + psf->str_end += strlen (psf->str_end) ; + } ; + + /* Plus one to catch string terminator. */ + psf->str_end += 1 ; + break ; + } ; + + /* Fall though if not write mode. */ + + case SF_STR_TITLE : + case SF_STR_COPYRIGHT : + case SF_STR_ARTIST : + case SF_STR_COMMENT : + case SF_STR_DATE : + psf->strings [k].type = str_type ; + psf->strings [k].str = psf->str_end ; + psf->strings [k].flags = str_flags ; + + /* Plus one to catch string terminator. */ + memcpy (psf->str_end, str, str_len + 1) ; + psf->str_end += str_len + 1 ; + break ; + + default : + return SFE_STR_BAD_TYPE ; + } ; + + psf->str_flags |= (psf->have_written) ? SF_STR_LOCATE_END : SF_STR_LOCATE_START ; + +#if STRINGS_DEBUG + hexdump (psf->str_storage, 300) ; +#endif + + return 0 ; +} /* psf_store_string */ + +int +psf_set_string (SF_PRIVATE *psf, int str_type, const char *str) +{ if (psf->mode == SFM_READ) + return SFE_STR_NOT_WRITE ; + + return psf_store_string (psf, str_type, str) ; +} /* psf_set_string */ + +const char* +psf_get_string (SF_PRIVATE *psf, int str_type) +{ int k ; + + for (k = 0 ; k < SF_MAX_STRINGS ; k++) + if (str_type == psf->strings [k].type) + return psf->strings [k].str ; + + return NULL ; +} /* psf_get_string */ + +#if STRINGS_DEBUG + +#include <ctype.h> +static void +hexdump (void *data, int len) +{ unsigned char *ptr ; + int k ; + + ptr = data ; + + puts ("---------------------------------------------------------") ; + while (len >= 16) + { for (k = 0 ; k < 16 ; k++) + printf ("%02X ", ptr [k] & 0xFF) ; + printf (" ") ; + for (k = 0 ; k < 16 ; k++) + printf ("%c", isprint (ptr [k]) ? ptr [k] : '.') ; + puts ("") ; + ptr += 16 ; + len -= 16 ; + } ; +} /* hexdump */ + +#endif +/* +** Do not edit or modify anything in this comment block. +** The arch-tag line is a file identity tag for the GNU Arch +** revision control system. +** +** arch-tag: 04393aa1-9389-46fe-baf2-58a7bd544fd6 +*/ |