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-rw-r--r--lib/names-hash.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/lib/names-hash.c b/lib/names-hash.c
new file mode 100644
index 0000000..2f5bc3c
--- /dev/null
+++ b/lib/names-hash.c
@@ -0,0 +1,128 @@
+/*
+ * The PCI Library -- ID to Name Hash
+ *
+ * Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <string.h>
+
+#include "internal.h"
+#include "names.h"
+
+struct id_bucket {
+ struct id_bucket *next;
+ unsigned int full;
+};
+
+#ifdef __GNUC__
+#define BUCKET_ALIGNMENT __alignof__(struct id_bucket)
+#else
+union id_align {
+ struct id_bucket *next;
+ unsigned int full;
+};
+#define BUCKET_ALIGNMENT sizeof(union id_align)
+#endif
+#define BUCKET_ALIGN(n) ((n)+BUCKET_ALIGNMENT-(n)%BUCKET_ALIGNMENT)
+
+static void *id_alloc(struct pci_access *a, unsigned int size)
+{
+ struct id_bucket *buck = a->current_id_bucket;
+ unsigned int pos;
+
+ if (!a->id_hash)
+ {
+ a->id_hash = pci_malloc(a, sizeof(struct id_entry *) * HASH_SIZE);
+ memset(a->id_hash, 0, sizeof(struct id_entry *) * HASH_SIZE);
+ }
+
+ if (!buck || buck->full + size > BUCKET_SIZE)
+ {
+ buck = pci_malloc(a, BUCKET_SIZE);
+ buck->next = a->current_id_bucket;
+ a->current_id_bucket = buck;
+ buck->full = BUCKET_ALIGN(sizeof(struct id_bucket));
+ }
+ pos = buck->full;
+ buck->full = BUCKET_ALIGN(buck->full + size);
+ return (byte *)buck + pos;
+}
+
+static inline unsigned int id_hash(int cat, u32 id12, u32 id34)
+{
+ unsigned int h;
+
+ h = id12 ^ (id34 << 3) ^ (cat << 5);
+ return h % HASH_SIZE;
+}
+
+int
+pci_id_insert(struct pci_access *a, int cat, int id1, int id2, int id3, int id4, char *text, enum id_entry_src src)
+{
+ u32 id12 = id_pair(id1, id2);
+ u32 id34 = id_pair(id3, id4);
+ unsigned int h = id_hash(cat, id12, id34);
+ struct id_entry *n = a->id_hash ? a->id_hash[h] : NULL;
+ int len = strlen(text);
+
+ while (n && (n->id12 != id12 || n->id34 != id34 || n->cat != cat))
+ n = n->next;
+ if (n)
+ return 1;
+ n = id_alloc(a, sizeof(struct id_entry) + len);
+ n->id12 = id12;
+ n->id34 = id34;
+ n->cat = cat;
+ n->src = src;
+ memcpy(n->name, text, len+1);
+ n->next = a->id_hash[h];
+ a->id_hash[h] = n;
+ return 0;
+}
+
+char
+*pci_id_lookup(struct pci_access *a, int flags, int cat, int id1, int id2, int id3, int id4)
+{
+ struct id_entry *n, *best;
+ u32 id12 = id_pair(id1, id2);
+ u32 id34 = id_pair(id3, id4);
+
+ if (a->id_hash)
+ {
+ n = a->id_hash[id_hash(cat, id12, id34)];
+ best = NULL;
+ for (; n; n=n->next)
+ {
+ if (n->id12 != id12 || n->id34 != id34 || n->cat != cat)
+ continue;
+ if (n->src == SRC_LOCAL && (flags & PCI_LOOKUP_SKIP_LOCAL))
+ continue;
+ if (n->src == SRC_NET && !(flags & PCI_LOOKUP_NETWORK))
+ continue;
+ if (n->src == SRC_CACHE && !(flags & PCI_LOOKUP_CACHE))
+ continue;
+ if (n->src == SRC_HWDB && (flags & (PCI_LOOKUP_SKIP_LOCAL | PCI_LOOKUP_NO_HWDB)))
+ continue;
+ if (!best || best->src < n->src)
+ best = n;
+ }
+ if (best)
+ return best->name;
+ }
+ return NULL;
+}
+
+void
+pci_id_hash_free(struct pci_access *a)
+{
+ pci_mfree(a->id_hash);
+ a->id_hash = NULL;
+ while (a->current_id_bucket)
+ {
+ struct id_bucket *buck = a->current_id_bucket;
+ a->current_id_bucket = buck->next;
+ pci_mfree(buck);
+ }
+}