WIP sj4lib

lib/sj4lib/sj.c

@@ -0,0 +1,214 @@
+#include <sj4lib.h>
+#include <sj_kanakan.h>
+
+#include <stdlib.h>
+
+#include <sj_euc2ucs.h>
+#include <sj_ucs2euc.h>
+
+static u_int ucs_to_euc(u_int in) {
+	if(0 <= in && in <= 0xffff) {
+		const T_U2E_BITMAP_INDEX* b = &utf16_to_euc_jp_table[(in >> 8) & 0xff];
+
+		if(b->byType == 2) {
+			b = &utf16_to_euc_jp_table[b->dwBitmapIndex + (in & 0xff)];
+
+			if(b->byType == 3) {
+				return b->dwEucJpCode;
+			}
+		}
+
+		return in;
+	}
+
+	return 0;
+}
+
+static u_int euc_to_ucs(u_int in) {
+	const T_E2U_BITMAP_INDEX* b = NULL;
+
+	if(in <= 0xff) {
+		b = &euc_jp_to_utf16_table[in];
+		if(b->byType != 3) return 0;
+
+		return b->dwUtf16Code;
+	} else if(in <= 0xffff) {
+		b = &euc_jp_to_utf16_table[(in >> 8) & 0xff];
+		if(b->byType != 2) return 0;
+
+		b = &euc_jp_to_utf16_table[b->dwBitmapIndex + ((in >> 0) & 0xff)];
+		if(b->byType != 3) return 0;
+
+		return b->dwUtf16Code;
+	} else {
+		b = &euc_jp_to_utf16_table[(in >> 16) & 0xff];
+		if(b->byType != 2) return 0;
+
+		b = &euc_jp_to_utf16_table[b->dwBitmapIndex + ((in >> 8) & 0xff)];
+		if(b->byType != 2) return 0;
+
+		b = &euc_jp_to_utf16_table[b->dwBitmapIndex + ((in >> 0) & 0xff)];
+		if(b->byType != 3) return 0;
+
+		return b->dwUtf16Code;
+	}
+
+	return 0;
+}
+
+static int from_sjis(u_char* out, const u_char* in, int len) {
+}
+
+static int utf8_later(unsigned char c) {
+	return 0x80 <= c && c < 0xc0;
+}
+
+#define CAST_I32(x) ((int)(x))
+
+static int from_utf8(u_char* out, const u_char* in, int len) {
+	const u_char* o_in  = in;
+	u_char*	      o_out = out;
+
+	while((in - o_in) < len) {
+		u_char c = *in;
+		u_int  n = 0;
+
+		if(c < 0x80) {
+			n = c;
+
+			in += 1;
+		} else if(0xc2 <= c && c < 0xe0) {
+			if(!utf8_later(in[1])) return 0;
+			if((in[0] & 0x1e) == 0) return 0;
+
+			n = CAST_I32(in[0] & 0x1f) << 6;
+			n |= CAST_I32(in[1] & 0x3f);
+
+			in += 2;
+		} else if(0xe0 <= c && c < 0xf0) {
+			if(!utf8_later(in[1]) || !utf8_later(in[2])) return 0;
+			if((in[0] & 0x0f) == 0 && (in[1] & 0x20) == 0) return 0;
+
+			n = CAST_I32(in[0] & 0x0f) << 12;
+			n |= CAST_I32(in[1] & 0x3f) << 6;
+			n |= CAST_I32(in[2] & 0x3f);
+
+			in += 3;
+		} else if(0xf0 <= c && c < 0xf8) {
+			if(!utf8_later(in[1]) || !utf8_later(in[2]) || !utf8_later(in[3])) return 0;
+			if((in[0] & 0x07) == 0 && (in[1] & 0x30) == 0) return 0;
+
+			n = CAST_I32(in[0] & 0x07) << 18;
+			n |= CAST_I32(in[1] & 0x3f) << 12;
+			n |= CAST_I32(in[2] & 0x3f) << 6;
+			n |= CAST_I32(in[3] & 0x3f);
+
+			in += 4;
+		}
+
+		n = ucs_to_euc(n);
+
+		if(n <= 0xff) {
+			*out++ = n;
+		} else if(n <= 0xffff) {
+			*out++ = (n >> 8) & 0xff;
+			*out++ = (n >> 0) & 0xff;
+		} else {
+			*out++ = (n >> 16) & 0xff;
+			*out++ = (n >> 8) & 0xff;
+			*out++ = (n >> 0) & 0xff;
+		}
+	}
+
+	return out - o_out;
+}
+
+static int from_utf16(u_char* out, const u_char* in, int len) {
+}
+
+static int to_sjis(u_char* out, const u_char* in, int len) {
+}
+
+static int to_utf8(u_char* out, const u_char* in, int len) {
+	const u_char* o_in  = in;
+	u_char*	      o_out = out;
+
+	while((in - o_in) < len) {
+		u_char c = *in;
+		u_int  n = 0;
+
+		if(c <= 0x7f) {
+			n = c;
+
+			in += 1;
+		} else if(c != 0x8f) {
+			n = CAST_I32(in[0]) << 8;
+			n |= CAST_I32(in[1]);
+
+			in += 2;
+		} else {
+			n = CAST_I32(in[0]) << 16;
+			n |= CAST_I32(in[1]) << 8;
+			n |= CAST_I32(in[2]);
+
+			in += 3;
+		}
+	}
+
+	return out - o_out;
+}
+
+static int to_utf16(u_char* out, const u_char* in, int len) {
+}
+
+struct sj4lib {
+	Sj4Context* ctx;
+
+	int charset;
+
+	u_char inbuf[SJ4BUFSZ];
+	u_char outbuf[SJ4BUFSZ];
+};
+
+Sj4Lib* sj4_open(int charset, const char* dic) {
+	Sj4Lib* ctx;
+
+	if((ctx = calloc(1, sizeof(*ctx))) == NULL) return NULL;
+
+	if((ctx->ctx = alloccontext(dic)) == NULL) {
+		free(ctx);
+
+		return NULL;
+	}
+
+	ctx->charset = charset;
+
+	return ctx;
+}
+
+#define ICONV(to, from, len, mode) \
+	if(ctx->charset == SJ4EUCJP) { \
+		memcpy(to, from, len); \
+	} else if(ctx->charset == SJ4SJIS) { \
+		len = mode##_sjis(to, from, len); \
+	} else if(ctx->charset == SJ4UTF8) { \
+		len = mode##_utf8(to, from, len); \
+	} else if(ctx->charset == SJ4UTF16) { \
+		len = mode##_utf16(to, from, len); \
+	}
+
+int sj4_getkan(Sj4Lib* ctx, const void* input, int len, Sj4Kouho* kouho) {
+	memset(kouho, 0, sizeof(*kouho));
+
+	ICONV(ctx->inbuf, input, len, from);
+
+	len = cl2knj(ctx->ctx, ctx->inbuf, len, ctx->outbuf);
+
+	ICONV(kouho->buffer.raw, ctx->outbuf, len, to);
+
+	return len;
+}
+
+void sj4_close(Sj4Lib* ctx) {
+	free(ctx);
+}