diff options
Diffstat (limited to 'libid3tag/parse.c')
| -rw-r--r-- | libid3tag/parse.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/libid3tag/parse.c b/libid3tag/parse.c new file mode 100644 index 0000000..86a3f21 --- /dev/null +++ b/libid3tag/parse.c @@ -0,0 +1,196 @@ +/* + * libid3tag - ID3 tag manipulation library + * Copyright (C) 2000-2004 Underbit Technologies, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU 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 + * + * $Id: parse.c,v 1.9 2004/01/23 09:41:32 rob Exp $ + */ + +# ifdef HAVE_CONFIG_H +# include "config.h" +# endif + +# include "global.h" + +# ifdef HAVE_ASSERT_H +# include <assert.h> +# endif + +# include <stdlib.h> +# include <string.h> + +# include "id3tag.h" +# include "parse.h" +# include "latin1.h" +# include "utf16.h" +# include "utf8.h" + +signed long id3_parse_int(id3_byte_t const **ptr, unsigned int bytes) +{ + signed long value = 0; + + assert(bytes >= 1 && bytes <= 4); + + if (**ptr & 0x80) + value = ~0; + + switch (bytes) { + case 4: value = (value << 8) | *(*ptr)++; + case 3: value = (value << 8) | *(*ptr)++; + case 2: value = (value << 8) | *(*ptr)++; + case 1: value = (value << 8) | *(*ptr)++; + } + + return value; +} + +unsigned long id3_parse_uint(id3_byte_t const **ptr, unsigned int bytes) +{ + unsigned long value = 0; + + assert(bytes >= 1 && bytes <= 4); + + switch (bytes) { + case 4: value = (value << 8) | *(*ptr)++; + case 3: value = (value << 8) | *(*ptr)++; + case 2: value = (value << 8) | *(*ptr)++; + case 1: value = (value << 8) | *(*ptr)++; + } + + return value; +} + +unsigned long id3_parse_syncsafe(id3_byte_t const **ptr, unsigned int bytes) +{ + unsigned long value = 0; + + assert(bytes == 4 || bytes == 5); + + switch (bytes) { + case 5: value = (value << 4) | (*(*ptr)++ & 0x0f); + case 4: value = (value << 7) | (*(*ptr)++ & 0x7f); + value = (value << 7) | (*(*ptr)++ & 0x7f); + value = (value << 7) | (*(*ptr)++ & 0x7f); + value = (value << 7) | (*(*ptr)++ & 0x7f); + } + + return value; +} + +void id3_parse_immediate(id3_byte_t const **ptr, unsigned int bytes, + char *value) +{ + assert(value); + assert(bytes == 8 || bytes == 4 || bytes == 3); + + switch (bytes) { + case 8: *value++ = *(*ptr)++; + *value++ = *(*ptr)++; + *value++ = *(*ptr)++; + *value++ = *(*ptr)++; + case 4: *value++ = *(*ptr)++; + case 3: *value++ = *(*ptr)++; + *value++ = *(*ptr)++; + *value++ = *(*ptr)++; + } + + *value = 0; +} + +id3_latin1_t *id3_parse_latin1(id3_byte_t const **ptr, id3_length_t length, + int full) +{ + id3_byte_t const *end; + int terminated = 0; + id3_latin1_t *latin1; + + end = memchr(*ptr, 0, length); + if (end == 0) + end = *ptr + length; + else { + length = end - *ptr; + terminated = 1; + } + + latin1 = malloc(length + 1); + if (latin1) { + memcpy(latin1, *ptr, length); + latin1[length] = 0; + + if (!full) { + id3_latin1_t *check; + + for (check = latin1; *check; ++check) { + if (*check == '\n') + *check = ' '; + } + } + } + + *ptr += length + terminated; + + return latin1; +} + +id3_ucs4_t *id3_parse_string(id3_byte_t const **ptr, id3_length_t length, + enum id3_field_textencoding encoding, int full) +{ + id3_ucs4_t *ucs4 = 0; + enum id3_utf16_byteorder byteorder = ID3_UTF16_BYTEORDER_ANY; + + switch (encoding) { + case ID3_FIELD_TEXTENCODING_ISO_8859_1: + ucs4 = id3_latin1_deserialize(ptr, length); + break; + + case ID3_FIELD_TEXTENCODING_UTF_16BE: + byteorder = ID3_UTF16_BYTEORDER_BE; + case ID3_FIELD_TEXTENCODING_UTF_16: + ucs4 = id3_utf16_deserialize(ptr, length, byteorder); + break; + + case ID3_FIELD_TEXTENCODING_UTF_8: + ucs4 = id3_utf8_deserialize(ptr, length); + break; + } + + if (ucs4 && !full) { + id3_ucs4_t *check; + + for (check = ucs4; *check; ++check) { + if (*check == '\n') + *check = ' '; + } + } + + return ucs4; +} + +id3_byte_t *id3_parse_binary(id3_byte_t const **ptr, id3_length_t length) +{ + id3_byte_t *data; + + if (length == 0) + return malloc(1); + + data = malloc(length); + if (data) + memcpy(data, *ptr, length); + + *ptr += length; + + return data; +} |