basic cuesheet charset detection

1 files changed, 594 insertions, 0 deletions

diff --git a/utf8.c b/utf8.c
new file mode 100644
index 00000000..06a9e3bb
--- /dev/null
+++ b/utf8.c
@@ -0,0 +1,594 @@
+/*
+  Basic UTF-8 manipulation routines
+  by Jeff Bezanson
+  placed in the public domain Fall 2005
+
+  This code is designed to provide the utilities you need to manipulate
+  UTF-8 as an int32_ternal string encoding. These functions do not perform the
+  error checking normally needed when handling UTF-8 data, so if you happen
+  to be from the Unicode Consortium you will want to flay me alive.
+  I do this because error checking can be performed at the boundaries (I/O),
+  with these routines reserved for higher performance on data known to be
+  valid.
+
+  adoption to deadbeef player by Alexey Yakovenko <waker@users.sourceforge.net>
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <alloca.h>
+#include "utf8.h"
+
+static const uint32_t offsetsFromUTF8[6] = {
+    0x00000000UL, 0x00003080UL, 0x000E2080UL,
+    0x03C82080UL, 0xFA082080UL, 0x82082080UL
+};
+
+static const char trailingBytesForUTF8[256] = {
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
+};
+
+/* conversions without error checking
+   only works for valid UTF-8, i.e. no 5- or 6-byte sequences
+   srcsz = source size in bytes, or -1 if 0-terminated
+   sz = dest size in # of wide characters
+
+   returns # characters converted
+   dest will always be L'\0'-terminated, even if there isn't enough room
+   for all the characters.
+   if sz = srcsz+1 (i.e. 4*srcsz+4 bytes), there will always be enough space.
+*/
+int u8_toucs(uint32_t *dest, int32_t sz, const char *src, int32_t srcsz)
+{
+    uint32_t ch;
+    const char *src_end = src + srcsz;
+    int32_t nb;
+    int32_t i=0;
+
+    while (i < sz-1) {
+        nb = trailingBytesForUTF8[(unsigned char)*src];
+        if (srcsz == -1) {
+            if (*src == 0)
+                goto done_toucs;
+        }
+        else {
+            if (src + nb >= src_end)
+                goto done_toucs;
+        }
+        ch = 0;
+        switch (nb) {
+            /* these fall through deliberately */
+        case 3: ch += (unsigned char)*src++; ch <<= 6;
+        case 2: ch += (unsigned char)*src++; ch <<= 6;
+        case 1: ch += (unsigned char)*src++; ch <<= 6;
+        case 0: ch += (unsigned char)*src++;
+        }
+        ch -= offsetsFromUTF8[nb];
+        dest[i++] = ch;
+    }
+ done_toucs:
+    dest[i] = 0;
+    return i;
+}
+
+/* srcsz = number of source characters, or -1 if 0-terminated
+   sz = size of dest buffer in bytes
+
+   returns # characters converted
+   dest will only be '\0'-terminated if there is enough space. this is
+   for consistency; imagine there are 2 bytes of space left, but the next
+   character requires 3 bytes. in this case we could NUL-terminate, but in
+   general we can't when there's insufficient space. therefore this function
+   only NUL-terminates if all the characters fit, and there's space for
+   the NUL as well.
+   the destination string will never be bigger than the source string.
+*/
+int u8_toutf8(char *dest, int32_t sz, uint32_t *src, int32_t srcsz)
+{
+    uint32_t ch;
+    int32_t i = 0;
+    char *dest_end = dest + sz;
+
+    while (srcsz<0 ? src[i]!=0 : i < srcsz) {
+        ch = src[i];
+        if (ch < 0x80) {
+            if (dest >= dest_end)
+                return i;
+            *dest++ = (char)ch;
+        }
+        else if (ch < 0x800) {
+            if (dest >= dest_end-1)
+                return i;
+            *dest++ = (ch>>6) | 0xC0;
+            *dest++ = (ch & 0x3F) | 0x80;
+        }
+        else if (ch < 0x10000) {
+            if (dest >= dest_end-2)
+                return i;
+            *dest++ = (ch>>12) | 0xE0;
+            *dest++ = ((ch>>6) & 0x3F) | 0x80;
+            *dest++ = (ch & 0x3F) | 0x80;
+        }
+        else if (ch < 0x200000) {
+            if (dest >= dest_end-3)
+                return i;
+            *dest++ = (ch>>18) | 0xF0;
+            *dest++ = ((ch>>12) & 0x3F) | 0x80;
+            *dest++ = ((ch>>6) & 0x3F) | 0x80;
+            *dest++ = (ch & 0x3F) | 0x80;
+        }
+        i++;
+    }
+    if (dest < dest_end)
+        *dest = '\0';
+    return i;
+}
+
+int u8_wc_toutf8(char *dest, wchar_t ch)
+{
+    if (ch < 0x80) {
+        dest[0] = (char)ch;
+        return 1;
+    }
+    if (ch < 0x800) {
+        dest[0] = (ch>>6) | 0xC0;
+        dest[1] = (ch & 0x3F) | 0x80;
+        return 2;
+    }
+    if (ch < 0x10000) {
+        dest[0] = (ch>>12) | 0xE0;
+        dest[1] = ((ch>>6) & 0x3F) | 0x80;
+        dest[2] = (ch & 0x3F) | 0x80;
+        return 3;
+    }
+    if (ch < 0x200000) {
+        dest[0] = (ch>>18) | 0xF0;
+        dest[1] = ((ch>>12) & 0x3F) | 0x80;
+        dest[2] = ((ch>>6) & 0x3F) | 0x80;
+        dest[3] = (ch & 0x3F) | 0x80;
+        return 4;
+    }
+    return 0;
+}
+
+/* charnum => byte offset */
+int u8_offset(char *str, int32_t charnum)
+{
+    int32_t offs=0;
+
+    while (charnum > 0 && str[offs]) {
+        (void)(isutf(str[++offs]) || isutf(str[++offs]) ||
+               isutf(str[++offs]) || ++offs);
+        charnum--;
+    }
+    return offs;
+}
+
+/* byte offset => charnum */
+int u8_charnum(char *s, int32_t offset)
+{
+    int32_t charnum = 0, offs=0;
+
+    while (offs < offset && s[offs]) {
+        (void)(isutf(s[++offs]) || isutf(s[++offs]) ||
+               isutf(s[++offs]) || ++offs);
+        charnum++;
+    }
+    return charnum;
+}
+
+/* number of characters */
+int u8_strlen(char *s)
+{
+    int32_t count = 0;
+    int32_t i = 0;
+
+    while (u8_nextchar(s, &i) != 0)
+        count++;
+
+    return count;
+}
+
+/* reads the next utf-8 sequence out of a string, updating an index */
+uint32_t u8_nextchar(const char *s, int32_t *i)
+{
+    uint32_t ch = 0;
+    int32_t sz = 0;
+
+    do {
+        ch <<= 6;
+        ch += (unsigned char)s[(*i)++];
+        sz++;
+    } while (s[*i] && !isutf(s[*i]));
+    ch -= offsetsFromUTF8[sz-1];
+
+    return ch;
+}
+
+void u8_inc(const char *s, int32_t *i)
+{
+    (void)(isutf(s[++(*i)]) || isutf(s[++(*i)]) ||
+           isutf(s[++(*i)]) || ++(*i));
+}
+
+void u8_dec(const char *s, int32_t *i)
+{
+    (void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) ||
+           isutf(s[--(*i)]) || --(*i));
+}
+
+int octal_digit(char c)
+{
+    return (c >= '0' && c <= '7');
+}
+
+int hex_digit(char c)
+{
+    return ((c >= '0' && c <= '9') ||
+            (c >= 'A' && c <= 'F') ||
+            (c >= 'a' && c <= 'f'));
+}
+
+/* assumes that src points to the character after a backslash
+   returns number of input characters processed */
+int u8_read_escape_sequence(const char *str, uint32_t *dest)
+{
+    uint32_t ch;
+    char digs[]="\0\0\0\0\0\0\0\0\0";
+    int32_t dno=0, i=1;
+
+    ch = (uint32_t)str[0];    /* take literal character */
+    if (str[0] == 'n')
+        ch = L'\n';
+    else if (str[0] == 't')
+        ch = L'\t';
+    else if (str[0] == 'r')
+        ch = L'\r';
+    else if (str[0] == 'b')
+        ch = L'\b';
+    else if (str[0] == 'f')
+        ch = L'\f';
+    else if (str[0] == 'v')
+        ch = L'\v';
+    else if (str[0] == 'a')
+        ch = L'\a';
+    else if (octal_digit(str[0])) {
+        i = 0;
+        do {
+            digs[dno++] = str[i++];
+        } while (octal_digit(str[i]) && dno < 3);
+        ch = strtol(digs, NULL, 8);
+    }
+    else if (str[0] == 'x') {
+        while (hex_digit(str[i]) && dno < 2) {
+            digs[dno++] = str[i++];
+        }
+        if (dno > 0)
+            ch = strtol(digs, NULL, 16);
+    }
+    else if (str[0] == 'u') {
+        while (hex_digit(str[i]) && dno < 4) {
+            digs[dno++] = str[i++];
+        }
+        if (dno > 0)
+            ch = strtol(digs, NULL, 16);
+    }
+    else if (str[0] == 'U') {
+        while (hex_digit(str[i]) && dno < 8) {
+            digs[dno++] = str[i++];
+        }
+        if (dno > 0)
+            ch = strtol(digs, NULL, 16);
+    }
+    *dest = ch;
+
+    return i;
+}
+
+// convert a string with literal \uxxxx or \Uxxxxxxxx characters to UTF-8
+// example: u8_unescape(mybuf, 256, "hello\\u220e")
+// note the double backslash is needed if called on a C string literal
+int u8_unescape(char *buf, int32_t sz, const char *src)
+{
+    int32_t c=0, amt;
+    uint32_t ch;
+    char temp[4];
+
+    while (*src && c < sz) {
+        if (*src == '\\') {
+            src++;
+            amt = u8_read_escape_sequence(src, &ch);
+        }
+        else {
+            ch = (uint32_t)*src;
+            amt = 1;
+        }
+        src += amt;
+        amt = u8_wc_toutf8(temp, ch);
+        if (amt > sz-c)
+            break;
+        memcpy(&buf[c], temp, amt);
+        c += amt;
+    }
+    if (c < sz)
+        buf[c] = '\0';
+    return c;
+}
+
+int u8_escape_wchar(char *buf, int32_t sz, uint32_t ch)
+{
+    if (ch == L'\n')
+        return snprintf(buf, sz, "\\n");
+    else if (ch == L'\t')
+        return snprintf(buf, sz, "\\t");
+    else if (ch == L'\r')
+        return snprintf(buf, sz, "\\r");
+    else if (ch == L'\b')
+        return snprintf(buf, sz, "\\b");
+    else if (ch == L'\f')
+        return snprintf(buf, sz, "\\f");
+    else if (ch == L'\v')
+        return snprintf(buf, sz, "\\v");
+    else if (ch == L'\a')
+        return snprintf(buf, sz, "\\a");
+    else if (ch == L'\\')
+        return snprintf(buf, sz, "\\\\");
+    else if (ch < 32 || ch == 0x7f)
+        return snprintf(buf, sz, "\\x%hhX", (unsigned char)ch);
+    else if (ch > 0xFFFF)
+        return snprintf(buf, sz, "\\U%.8lX", (uint32_t)ch);
+    else if (ch >= 0x80 && ch <= 0xFFFF)
+        return snprintf(buf, sz, "\\u%.4hX", (unsigned short)ch);
+
+    return snprintf(buf, sz, "%c", (char)ch);
+}
+
+int u8_escape(char *buf, int32_t sz, const char *src, int32_t escape_quotes)
+{
+    int32_t c=0, i=0, amt;
+
+    while (src[i] && c < sz) {
+        if (escape_quotes && src[i] == '"') {
+            amt = snprintf(buf, sz - c, "\\\"");
+            i++;
+        }
+        else {
+            amt = u8_escape_wchar(buf, sz - c, u8_nextchar(src, &i));
+        }
+        c += amt;
+        buf += amt;
+    }
+    if (c < sz)
+        *buf = '\0';
+    return c;
+}
+
+char *u8_strchr(char *s, uint32_t ch, int32_t *charn)
+{
+    int32_t i = 0, lasti=0;
+    uint32_t c;
+
+    *charn = 0;
+    while (s[i]) {
+        c = u8_nextchar(s, &i);
+        if (c == ch) {
+            return &s[lasti];
+        }
+        lasti = i;
+        (*charn)++;
+    }
+    return NULL;
+}
+
+char *u8_memchr(char *s, uint32_t ch, size_t sz, int32_t *charn)
+{
+    int32_t i = 0, lasti=0;
+    uint32_t c;
+    int32_t csz;
+
+    *charn = 0;
+    while (i < sz) {
+        c = csz = 0;
+        do {
+            c <<= 6;
+            c += (unsigned char)s[i++];
+            csz++;
+        } while (i < sz && !isutf(s[i]));
+        c -= offsetsFromUTF8[csz-1];
+
+        if (c == ch) {
+            return &s[lasti];
+        }
+        lasti = i;
+        (*charn)++;
+    }
+    return NULL;
+}
+
+int u8_is_locale_utf8(char *locale)
+{
+    /* this code based on libutf8 */
+    const char* cp = locale;
+
+    for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++) {
+        if (*cp == '.') {
+            const char* encoding = ++cp;
+            for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++)
+                ;
+            if ((cp-encoding == 5 && !strncmp(encoding, "UTF-8", 5))
+                || (cp-encoding == 4 && !strncmp(encoding, "utf8", 4)))
+                return 1; /* it's UTF-8 */
+            break;
+        }
+    }
+    return 0;
+}
+
+int u8_vprintf(char *fmt, va_list ap)
+{
+    int32_t cnt, sz=0;
+    char *buf;
+    uint32_t *wcs;
+
+    sz = 512;
+    buf = (char*)alloca(sz);
+ try_print:
+    cnt = vsnprintf(buf, sz, fmt, ap);
+    if (cnt >= sz) {
+        buf = (char*)alloca(cnt - sz + 1);
+        sz = cnt + 1;
+        goto try_print;
+    }
+    wcs = (uint32_t*)alloca((cnt+1) * sizeof(uint32_t));
+    cnt = u8_toucs(wcs, cnt+1, buf, cnt);
+    printf("%ls", (wchar_t*)wcs);
+    return cnt;
+}
+
+int u8_printf(char *fmt, ...)
+{
+    int32_t cnt;
+    va_list args;
+
+    va_start(args, fmt);
+
+    cnt = u8_vprintf(fmt, args);
+
+    va_end(args);
+    return cnt;
+}
+
+// adaptation of g_utf8_validate
+
+#define UTF8_COMPUTE(Char, Mask, Len)                                         \
+  if (Char < 128)                                                             \
+    {                                                                         \
+      Len = 1;                                                                \
+      Mask = 0x7f;                                                            \
+    }                                                                         \
+  else if ((Char & 0xe0) == 0xc0)                                             \
+    {                                                                         \
+      Len = 2;                                                                \
+      Mask = 0x1f;                                                            \
+    }                                                                         \
+  else if ((Char & 0xf0) == 0xe0)                                             \
+    {                                                                         \
+      Len = 3;                                                                \
+      Mask = 0x0f;                                                            \
+    }                                                                         \
+  else if ((Char & 0xf8) == 0xf0)                                             \
+    {                                                                         \
+      Len = 4;                                                                \
+      Mask = 0x07;                                                            \
+    }                                                                         \
+  else if ((Char & 0xfc) == 0xf8)                                             \
+    {                                                                         \
+      Len = 5;                                                                \
+      Mask = 0x03;                                                            \
+    }                                                                         \
+  else if ((Char & 0xfe) == 0xfc)                                             \
+    {                                                                         \
+      Len = 6;                                                                \
+      Mask = 0x01;                                                            \
+    }                                                                         \
+  else                                                                        \
+    Len = -1;
+
+#define UTF8_LENGTH(Char)              \
+  ((Char) < 0x80 ? 1 :                 \
+   ((Char) < 0x800 ? 2 :               \
+    ((Char) < 0x10000 ? 3 :            \
+     ((Char) < 0x200000 ? 4 :          \
+      ((Char) < 0x4000000 ? 5 : 6)))))
+
+
+#define UTF8_GET(Result, Chars, Count, Mask, Len)                             \
+  (Result) = (Chars)[0] & (Mask);                                             \
+  for ((Count) = 1; (Count) < (Len); ++(Count))                               \
+    {                                                                         \
+      if (((Chars)[(Count)] & 0xc0) != 0x80)                                  \
+        {                                                                     \
+          (Result) = -1;                                                      \
+          break;                                                              \
+        }                                                                     \
+      (Result) <<= 6;                                                         \
+      (Result) |= ((Chars)[(Count)] & 0x3f);                                  \
+    }
+
+#define UNICODE_VALID(Char)                   \
+    ((Char) < 0x110000 &&                     \
+     (((Char) & 0xFFFFF800) != 0xD800) &&     \
+     ((Char) < 0xFDD0 || (Char) > 0xFDEF) &&  \
+     ((Char) & 0xFFFE) != 0xFFFE)
+
+
+int u8_valid (const char  *str,
+        int max_len,
+        const char **end)
+{
+
+    const char *p;
+
+    if (!str) {
+        return 0;
+    }
+
+    if (end)
+        *end = str;
+
+    p = str;
+
+    while ((max_len < 0 || (p - str) < max_len) && *p)
+    {
+        int i, mask = 0, len;
+        int32_t result;
+        unsigned char c = (unsigned char) *p;
+
+        UTF8_COMPUTE (c, mask, len);
+
+        if (len == -1)
+            break;
+
+        /* check that the expected number of bytes exists in str */
+        if (max_len >= 0 &&
+                ((max_len - (p - str)) < len))
+            break;
+
+        UTF8_GET (result, p, i, mask, len);
+
+        if (UTF8_LENGTH (result) != len) /* Check for overlong UTF-8 */
+            break;
+
+        if (result == (int32_t)-1)
+            break;
+
+        if (!UNICODE_VALID (result))
+            break;
+
+        p += len;
+    }
+
+    if (end)
+        *end = p;
+
+    /* See that we covered the entire length if a length was
+     * passed in, or that we ended on a nul if not
+     */
+    if (max_len >= 0 &&
+            p != (str + max_len))
+        return 0;
+    else if (max_len < 0 &&
+            *p != '\0')
+        return 0;
+    else
+        return 1;
+}
+