1 files changed, 231 insertions, 0 deletions
diff --git a/misc/bstr.h b/misc/bstr.h
new file mode 100644
index 0000000..dc8ad40
--- /dev/null
+++ b/misc/bstr.h
@@ -0,0 +1,231 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv 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.
+ *
+ * mpv 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 mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MPLAYER_BSTR_H
+#define MPLAYER_BSTR_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdarg.h>
+
+#include "mpv_talloc.h"
+#include "osdep/compiler.h"
+
+/* NOTE: 'len' is size_t, but most string-handling functions below assume
+ * that input size has been sanity checked and len fits in an int.
+ */
+typedef struct bstr {
+    unsigned char *start;
+    size_t len;
+} bstr;
+
+// If str.start is NULL, return NULL.
+static inline char *bstrdup0(void *talloc_ctx, struct bstr str)
+{
+    return talloc_strndup(talloc_ctx, (char *)str.start, str.len);
+}
+
+// Like bstrdup0(), but always return a valid C-string.
+static inline char *bstrto0(void *talloc_ctx, struct bstr str)
+{
+    return str.start ? bstrdup0(talloc_ctx, str) : talloc_strdup(talloc_ctx, "");
+}
+
+// Return start = NULL iff that is true for the original.
+static inline struct bstr bstrdup(void *talloc_ctx, struct bstr str)
+{
+    struct bstr r = { NULL, str.len };
+    if (str.start)
+        r.start = (unsigned char *)talloc_memdup(talloc_ctx, str.start, str.len);
+    return r;
+}
+
+static inline struct bstr bstr0(const char *s)
+{
+    return (struct bstr){(unsigned char *)s, s ? strlen(s) : 0};
+}
+
+int bstrcmp(struct bstr str1, struct bstr str2);
+int bstrcasecmp(struct bstr str1, struct bstr str2);
+int bstrchr(struct bstr str, int c);
+int bstrrchr(struct bstr str, int c);
+int bstrspn(struct bstr str, const char *accept);
+int bstrcspn(struct bstr str, const char *reject);
+
+int bstr_find(struct bstr haystack, struct bstr needle);
+struct bstr bstr_lstrip(struct bstr str);
+struct bstr bstr_strip(struct bstr str);
+struct bstr bstr_split(struct bstr str, const char *sep, struct bstr *rest);
+bool bstr_split_tok(bstr str, const char *tok, bstr *out_left, bstr *out_right);
+struct bstr bstr_splice(struct bstr str, int start, int end);
+long long bstrtoll(struct bstr str, struct bstr *rest, int base);
+double bstrtod(struct bstr str, struct bstr *rest);
+void bstr_lower(struct bstr str);
+int bstr_sscanf(struct bstr str, const char *format, ...);
+
+// Decode a string containing hexadecimal data. All whitespace will be silently
+// ignored. When successful, this allocates a new array to store the output.
+bool bstr_decode_hex(void *talloc_ctx, struct bstr hex, struct bstr *out);
+
+// Decode the UTF-8 code point at the start of the string, and return the
+// character.
+// After calling this function, *out_next will point to the next character.
+// out_next can be NULL.
+// On error, -1 is returned, and *out_next is not modified.
+int bstr_decode_utf8(struct bstr str, struct bstr *out_next);
+
+// Return the UTF-8 code point at the start of the string.
+// After calling this function, *out_next will point to the next character.
+// out_next can be NULL.
+// On error, an empty string is returned, and *out_next is not modified.
+struct bstr bstr_split_utf8(struct bstr str, struct bstr *out_next);
+
+// Return the length of the UTF-8 sequence that starts with the given byte.
+// Given a string char *s, the next UTF-8 code point is to be expected at
+//      s + bstr_parse_utf8_code_length(s[0])
+// On error, -1 is returned. On success, it returns a value in the range [1, 4].
+int bstr_parse_utf8_code_length(unsigned char b);
+
+// Return >= 0 if the string is valid UTF-8, otherwise negative error code.
+// Embedded \0 bytes are considered valid.
+// This returns -N if the UTF-8 string was likely just cut-off in the middle of
+// an UTF-8 sequence: -1 means 1 byte was missing, -5 5 bytes missing.
+// If the string was likely not cut off, -8 is returned.
+// Use (return_value > -8) to check whether the string is valid UTF-8 or valid
+// but cut-off UTF-8.
+int bstr_validate_utf8(struct bstr s);
+
+// Force the input string to valid UTF-8. If invalid UTF-8 encoding is
+// encountered, the invalid bytes are interpreted as Latin-1.
+// Embedded \0 bytes are considered valid.
+// If replacement happens, a newly allocated string is returned (with a \0
+// byte added past its end for convenience). The string is allocated via
+// talloc, with talloc_ctx as parent.
+struct bstr bstr_sanitize_utf8_latin1(void *talloc_ctx, struct bstr s);
+
+// Return the text before the occurrence of a character, and return it. Change
+// *rest to point to the text following this character. (rest can be NULL.)
+struct bstr bstr_splitchar(struct bstr str, struct bstr *rest, const char c);
+
+// Like bstr_splitchar. Trailing newlines are not stripped.
+static inline struct bstr bstr_getline(struct bstr str, struct bstr *rest)
+{
+    return bstr_splitchar(str, rest, '\n');
+}
+
+// Strip one trailing line break. This is intended for use with bstr_getline,
+// and will remove the trailing \n or \r\n sequence.
+struct bstr bstr_strip_linebreaks(struct bstr str);
+
+void bstr_xappend(void *talloc_ctx, bstr *s, bstr append);
+void bstr_xappend_asprintf(void *talloc_ctx, bstr *s, const char *fmt, ...)
+    PRINTF_ATTRIBUTE(3, 4);
+void bstr_xappend_vasprintf(void *talloc_ctx, bstr *s, const char *fmt, va_list va)
+    PRINTF_ATTRIBUTE(3, 0);
+
+// If s starts/ends with prefix, return true and return the rest of the string
+// in s.
+bool bstr_eatstart(struct bstr *s, struct bstr prefix);
+bool bstr_eatend(struct bstr *s, struct bstr prefix);
+
+bool bstr_case_startswith(struct bstr s, struct bstr prefix);
+bool bstr_case_endswith(struct bstr s, struct bstr suffix);
+struct bstr bstr_strip_ext(struct bstr str);
+struct bstr bstr_get_ext(struct bstr s);
+
+static inline struct bstr bstr_cut(struct bstr str, int n)
+{
+    if (n < 0) {
+        n += str.len;
+        if (n < 0)
+            n = 0;
+    }
+    if (((size_t)n) > str.len)
+        n = str.len;
+    return (struct bstr){str.start + n, str.len - n};
+}
+
+static inline bool bstr_startswith(struct bstr str, struct bstr prefix)
+{
+    if (str.len < prefix.len)
+        return false;
+    return !memcmp(str.start, prefix.start, prefix.len);
+}
+
+static inline bool bstr_startswith0(struct bstr str, const char *prefix)
+{
+    return bstr_startswith(str, bstr0(prefix));
+}
+
+static inline bool bstr_endswith(struct bstr str, struct bstr suffix)
+{
+    if (str.len < suffix.len)
+        return false;
+    return !memcmp(str.start + str.len - suffix.len, suffix.start, suffix.len);
+}
+
+static inline bool bstr_endswith0(struct bstr str, const char *suffix)
+{
+    return bstr_endswith(str, bstr0(suffix));
+}
+
+static inline int bstrcmp0(struct bstr str1, const char *str2)
+{
+    return bstrcmp(str1, bstr0(str2));
+}
+
+static inline bool bstr_equals(struct bstr str1, struct bstr str2)
+{
+    if (str1.len != str2.len)
+        return false;
+
+    return str1.start == str2.start || bstrcmp(str1, str2) == 0;
+}
+
+static inline bool bstr_equals0(struct bstr str1, const char *str2)
+{
+    return bstr_equals(str1, bstr0(str2));
+}
+
+static inline int bstrcasecmp0(struct bstr str1, const char *str2)
+{
+    return bstrcasecmp(str1, bstr0(str2));
+}
+
+static inline int bstr_find0(struct bstr haystack, const char *needle)
+{
+    return bstr_find(haystack, bstr0(needle));
+}
+
+static inline bool bstr_eatstart0(struct bstr *s, const char *prefix)
+{
+    return bstr_eatstart(s, bstr0(prefix));
+}
+
+static inline bool bstr_eatend0(struct bstr *s, const char *prefix)
+{
+    return bstr_eatend(s, bstr0(prefix));
+}
+
+// create a pair (not single value!) for "%.*s" printf syntax
+#define BSTR_P(bstr) (int)((bstr).len), ((bstr).start ? (char*)(bstr).start : "")
+
+#define WHITESPACE " \f\n\r\t\v"
+
+#endif /* MPLAYER_BSTR_H */