encoding.c: Support the ISO 8859-1 encoding.

src/include/espeak-ng/espeak_ng.h

 {
 	ESPEAKNG_ENCODING_UNKNOWN,
 	ESPEAKNG_ENCODING_US_ASCII,
+	ESPEAKNG_ENCODING_ISO_8859_1,
 } espeak_ng_ENCODING;
 
 ESPEAK_NG_API espeak_ng_ENCODING

src/libespeak-ng/encoding.c

 	{ "ANSI_X3.4-1968",   ESPEAKNG_ENCODING_US_ASCII },
 	{ "ANSI_X3.4-1986",   ESPEAKNG_ENCODING_US_ASCII },
 	{ "IBM367",           ESPEAKNG_ENCODING_US_ASCII },
+	{ "IBM819",           ESPEAKNG_ENCODING_ISO_8859_1 },
 	{ "ISO_646.irv:1991", ESPEAKNG_ENCODING_US_ASCII },
+	{ "ISO_8859-1",       ESPEAKNG_ENCODING_ISO_8859_1 },
 	{ "ISO646-US",        ESPEAKNG_ENCODING_US_ASCII },
+	{ "ISO-8859-1",       ESPEAKNG_ENCODING_ISO_8859_1 },
+	{ "ISO-8859-1:1987",  ESPEAKNG_ENCODING_ISO_8859_1 },
 	{ "US-ASCII",         ESPEAKNG_ENCODING_US_ASCII },
 	{ "cp367",            ESPEAKNG_ENCODING_US_ASCII },
+	{ "cp819",            ESPEAKNG_ENCODING_ISO_8859_1 },
 	{ "csASCII",          ESPEAKNG_ENCODING_US_ASCII },
+	{ "csISOLatin1",      ESPEAKNG_ENCODING_ISO_8859_1 },
 	{ "iso-ir-6",         ESPEAKNG_ENCODING_US_ASCII },
+	{ "iso-ir-100",       ESPEAKNG_ENCODING_ISO_8859_1 },
+	{ "latin1",           ESPEAKNG_ENCODING_ISO_8859_1 },
+	{ "l1",               ESPEAKNG_ENCODING_ISO_8859_1 },
 	{ "us",               ESPEAKNG_ENCODING_US_ASCII },
 	{ NULL,               ESPEAKNG_ENCODING_UNKNOWN }
 };
 {
 	const char *current;
 	const char *end;
+
+	uint32_t (*get)(espeak_ng_TEXT_DECODER *decoder);
 };
 
+static uint32_t
+text_decoder_getc_us_ascii(espeak_ng_TEXT_DECODER *decoder)
+{
+	uint8_t c = *decoder->current++ & 0xFF;
+	return (c >= 0x80) ? 0xFFFD : c;
+}
+
+// Reference: http://www.iana.org/go/rfc1345
+// Reference: http://www.unicode.org/Public/MAPPINGS/ISO8859/8859-1.TXT
+static uint32_t
+text_decoder_getc_iso_8859_1(espeak_ng_TEXT_DECODER *decoder)
+{
+	return *decoder->current++ & 0xFF;
+}
+
 espeak_ng_TEXT_DECODER *
 create_text_decoder(void)
 {
 
 	decoder->current = NULL;
 	decoder->end = NULL;
+	decoder->get = NULL;
 	return decoder;
 }
 
 	switch (encoding)
 	{
 	case ESPEAKNG_ENCODING_US_ASCII:
+		decoder->get = text_decoder_getc_us_ascii;
+		break;
+	case ESPEAKNG_ENCODING_ISO_8859_1:
+		decoder->get = text_decoder_getc_iso_8859_1;
 		break;
 	default:
 		return 0;
 uint32_t
 text_decoder_getc(espeak_ng_TEXT_DECODER *decoder)
 {
-	uint8_t c = *decoder->current++ & 0xFF;
-	return (c >= 0x80) ? 0xFFFD : c;
+	return decoder->get(decoder);
 }

tests/encoding.c

 	destroy_text_decoder(decoder);
 }
 
+void
+test_iso_8859_1_encoding()
+{
+	printf("testing ISO-8859-1 encoding\n");
+
+	assert(espeak_ng_EncodingFromName("ISO-8859-1:1987") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("ISO-8859-1") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("ISO_8859-1") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("iso-ir-100") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("latin1") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("l1") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("IBM819") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("cp819") == ESPEAKNG_ENCODING_ISO_8859_1);
+	assert(espeak_ng_EncodingFromName("csISOLatin1") == ESPEAKNG_ENCODING_ISO_8859_1);
+
+	espeak_ng_TEXT_DECODER *decoder = create_text_decoder();
+
+	assert(text_decoder_decode_string(decoder, "aG\x92\xA0\xDE", 5, ESPEAKNG_ENCODING_ISO_8859_1) == ENS_OK);
+	assert(text_decoder_eof(decoder) == 0);
+	assert(text_decoder_getc(decoder) == 'a');
+	assert(text_decoder_eof(decoder) == 0);
+	assert(text_decoder_getc(decoder) == 'G');
+	assert(text_decoder_eof(decoder) == 0);
+	assert(text_decoder_getc(decoder) == 0x92);
+	assert(text_decoder_eof(decoder) == 0);
+	assert(text_decoder_getc(decoder) == 0xA0);
+	assert(text_decoder_eof(decoder) == 0);
+	assert(text_decoder_getc(decoder) == 0xDE);
+	assert(text_decoder_eof(decoder) == 1);
+
+	destroy_text_decoder(decoder);
+}
+
 int
 main(int argc, char **argv)
 {
 	test_unbound_text_decoder();
 	test_unknown_encoding();
 	test_us_ascii_encoding();
+	test_iso_8859_1_encoding();
 	printf("done\n");
 
 	return EXIT_SUCCESS;