add encoding alias to canonical name conversion routine

based on whatwg web encoding spec

src/CMakeLists.txt

@@ -19,6 +19,7 @@ set(source_list
     audio_thread_noaudio.c
     config.c
     compat.c
+    encoding_alias.c
     font.c
     header_parser.c
     keycodeconvert.c

src/encoding_alias.c

@@ -0,0 +1,148 @@
+/*
+ * Copyright © 2013-2016  Rinat Ibragimov
+ *
+ * This file is part of FreshPlayerPlugin.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "encoding_alias.h"
+#include <glib.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+
+enum {
+    UIGNORE = 0,
+    ZERO =    1,
+    NONZ =    2,
+};
+
+static const uint8_t char_types[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,
+    ZERO, NONZ, NONZ, NONZ, NONZ, NONZ, NONZ, NONZ, NONZ, NONZ, 0,    0,    0,    0,    0,    0,
+    0,    0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0,    0,    0,    0,    0,
+    0,    0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0,    0,    0,    0,    0,
+
+    /* remaining 128-255 are 0 */
+};
+
+// maps an alias to the canonical encoding name
+static GHashTable *ce_ht; // char * -> char *
+
+
+static
+char *
+strip_enc_name(const char *name)
+{
+    if (!name)
+        return NULL;
+
+    char *dst = strdup(name);
+    if (!dst)
+        return NULL;
+
+    char *p = dst;
+    int after_digit = 0;
+
+    while (1) {
+        char c = *name++;
+        if (c == '\0')
+            break;
+
+        const uint8_t type = char_types[(uint8_t)c];
+        switch (type) {
+        case UIGNORE:
+            after_digit = 0;
+            // ignore all but letter and digits
+            continue;
+
+        case ZERO:
+            if (!after_digit) {
+                const uint8_t next_type = char_types[(uint8_t)(*name)];
+                if (next_type == ZERO || next_type == NONZ) {
+                    // ignore leading zero before another digit
+                    continue;
+                }
+            }
+            break;
+
+        case NONZ:
+            after_digit = 1;
+            break;
+
+        default:
+            c = type; // lowercased letter
+            after_digit = 0;
+            break;
+        }
+
+        *p++ = c;
+    }
+
+    *p = 0;
+    return dst;
+}
+
+__attribute__((constructor))
+static
+void
+constructor_encoding_alias(void)
+{
+    ce_ht = g_hash_table_new_full(g_str_hash, g_str_equal, free, free);
+
+    struct {
+        const char *dst;
+        const char *src;
+    } encs[] = {
+#include "encoding_alias_list.inc.c"
+    };
+
+    for (uint32_t k = 0; k < sizeof(encs) / sizeof(encs[0]); k ++) {
+        char *stripped_src_name = strip_enc_name(encs[k].src);
+        g_hash_table_insert(ce_ht, stripped_src_name, strdup(encs[k].dst));
+    }
+}
+
+__attribute__((destructor))
+static
+void
+destructor_encoding_alias(void)
+{
+    g_hash_table_destroy(ce_ht);
+}
+
+const char *
+encoding_alias_get_canonical_name(const char *name)
+{
+    const char *res = name;
+    char *stripped_name = strip_enc_name(name);
+
+    res = g_hash_table_lookup(ce_ht, stripped_name);
+    if (!res)
+        res = name;
+
+    g_free(stripped_name);
+    return res;
+}

src/encoding_alias.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright © 2013-2016  Rinat Ibragimov
+ *
+ * This file is part of FreshPlayerPlugin.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+
+
+const char *
+encoding_alias_get_canonical_name(const char *name);