First Commit

3rdparty/libzip/lib/zip_string.c

@@ -0,0 +1,194 @@
+/*
+  zip_string.c -- string handling (with encoding)
+  Copyright (C) 2012-2024 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <info@libzip.org>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+  3. The names of the authors may not be used to endorse or promote
+     products derived from this software without specific prior
+     written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#include <stdlib.h>
+#include <string.h>
+#include <zlib.h>
+
+#include "zipint.h"
+
+zip_uint32_t
+_zip_string_crc32(const zip_string_t *s) {
+    zip_uint32_t crc;
+
+    crc = (zip_uint32_t)crc32(0L, Z_NULL, 0);
+
+    if (s != NULL)
+        crc = (zip_uint32_t)crc32(crc, s->raw, s->length);
+
+    return crc;
+}
+
+
+int
+_zip_string_equal(const zip_string_t *a, const zip_string_t *b) {
+    if (a == NULL || b == NULL)
+        return a == b;
+
+    if (a->length != b->length)
+        return 0;
+
+    /* TODO: encoding */
+
+    return (memcmp(a->raw, b->raw, a->length) == 0);
+}
+
+
+void
+_zip_string_free(zip_string_t *s) {
+    if (s == NULL)
+        return;
+
+    free(s->raw);
+    free(s->converted);
+    free(s);
+}
+
+
+const zip_uint8_t *
+_zip_string_get(zip_string_t *string, zip_uint32_t *lenp, zip_flags_t flags, zip_error_t *error) {
+    static const zip_uint8_t empty[1] = "";
+
+    if (string == NULL) {
+        if (lenp)
+            *lenp = 0;
+        return empty;
+    }
+
+    if ((flags & ZIP_FL_ENC_RAW) == 0) {
+        /* start guessing */
+        if (string->encoding == ZIP_ENCODING_UNKNOWN) {
+            /* guess encoding, sets string->encoding */
+            (void)_zip_guess_encoding(string, ZIP_ENCODING_UNKNOWN);
+        }
+
+        if (((flags & ZIP_FL_ENC_STRICT) && string->encoding != ZIP_ENCODING_ASCII && string->encoding != ZIP_ENCODING_UTF8_KNOWN) || (string->encoding == ZIP_ENCODING_CP437)) {
+            if (string->converted == NULL) {
+                if ((string->converted = _zip_cp437_to_utf8(string->raw, string->length, &string->converted_length, error)) == NULL)
+                    return NULL;
+            }
+            if (lenp)
+                *lenp = string->converted_length;
+            return string->converted;
+        }
+    }
+
+    if (lenp)
+        *lenp = string->length;
+    return string->raw;
+}
+
+bool _zip_string_is_ascii(const zip_string_t *string) {
+    if (string->encoding != ZIP_ENCODING_ASCII) {
+        zip_uint16_t i;
+
+        for (i = 0; i < string->length; i++) {
+            if (string->raw[i] & 0x80) {
+                return false;
+            }
+        }
+    }
+
+    return true;
+}
+
+
+zip_uint16_t
+_zip_string_length(const zip_string_t *s) {
+    if (s == NULL)
+        return 0;
+
+    return s->length;
+}
+
+
+zip_string_t *
+_zip_string_new(const zip_uint8_t *raw, zip_uint16_t length, zip_flags_t flags, zip_error_t *error) {
+    zip_string_t *s;
+    zip_encoding_type_t expected_encoding;
+
+    if (length == 0)
+        return NULL;
+
+    switch (flags & ZIP_FL_ENCODING_ALL) {
+    case ZIP_FL_ENC_GUESS:
+        expected_encoding = ZIP_ENCODING_UNKNOWN;
+        break;
+    case ZIP_FL_ENC_UTF_8:
+        expected_encoding = ZIP_ENCODING_UTF8_KNOWN;
+        break;
+    case ZIP_FL_ENC_CP437:
+        expected_encoding = ZIP_ENCODING_CP437;
+        break;
+    default:
+        zip_error_set(error, ZIP_ER_INVAL, 0);
+        return NULL;
+    }
+
+    if ((s = (zip_string_t *)malloc(sizeof(*s))) == NULL) {
+        zip_error_set(error, ZIP_ER_MEMORY, 0);
+        return NULL;
+    }
+
+    if ((s->raw = (zip_uint8_t *)malloc((size_t)length + 1)) == NULL) {
+        free(s);
+        return NULL;
+    }
+
+    (void)memcpy_s(s->raw, length + 1, raw, length);
+    s->raw[length] = '\0';
+    s->length = length;
+    s->encoding = ZIP_ENCODING_UNKNOWN;
+    s->converted = NULL;
+    s->converted_length = 0;
+
+    if (expected_encoding != ZIP_ENCODING_UNKNOWN) {
+        if (_zip_guess_encoding(s, expected_encoding) == ZIP_ENCODING_ERROR) {
+            _zip_string_free(s);
+            zip_error_set(error, ZIP_ER_INVAL, 0);
+            return NULL;
+        }
+    }
+
+    return s;
+}
+
+
+int
+_zip_string_write(zip_t *za, const zip_string_t *s) {
+    if (s == NULL)
+        return 0;
+
+    return _zip_write(za, s->raw, s->length);
+}