Added tableinfo

1 files changed, 93 insertions, 0 deletions

diff --git a/src/solvers/tables.h b/src/solvers/tables.h
new file mode 100644
index 0000000..be0209f
--- /dev/null
+++ b/src/solvers/tables.h
@@ -0,0 +1,93 @@
+#define OFFSET(B, K)             (((uint8_t *)B) + K)
+#define INFOSIZE                 512
+#define INFO_OFFSET_SOLVER       0
+#define INFO_SOLVER_STRLEN       20
+#define INFO_OFFSET_INFOSIZE     INFO_SOLVER_STRLEN
+#define INFO_OFFSET_FULLSIZE     (INFO_OFFSET_INFOSIZE + sizeof(uint64_t))
+#define INFO_OFFSET_HASH         (INFO_OFFSET_FULLSIZE + sizeof(uint64_t))
+#define INFO_OFFSET_ENTRIES      (INFO_OFFSET_HASH + sizeof(uint64_t))
+#define INFO_OFFSET_BITS         (INFO_OFFSET_ENTRIES + sizeof(uint64_t))
+#define INFO_OFFSET_BASE         (INFO_OFFSET_BITS + sizeof(uint8_t))
+#define INFO_OFFSET_MAXVALUE     (INFO_OFFSET_BASE + sizeof(uint8_t))
+#define INFO_OFFSET_DISTRIBUTION (INFO_OFFSET_MAXVALUE + sizeof(uint8_t))
+#define INFO_DISTRIBUTION_LEN    21
+
+typedef struct {
+        char solver[INFO_SOLVER_STRLEN];
+        uint64_t infosize;
+        uint64_t fullsize;
+        uint64_t hash;
+        uint64_t entries;
+        uint8_t bits;
+        uint8_t base;
+        uint8_t maxvalue;
+        uint64_t distribution[INFO_DISTRIBUTION_LEN];
+} tableinfo_t;
+
+STATIC bool readtableinfo(const void *, tableinfo_t *);
+STATIC bool writetableinfo(const tableinfo_t *, void *);
+
+STATIC bool
+readtableinfo(const void *buf, tableinfo_t *info)
+{
+        if (buf == NULL) {
+                LOG("Error reading table: buffer in NULL\n");
+                return false;
+        }
+
+        if (info == NULL) {
+                LOG("Error reading table info: info struct is NULL\n");
+                return false;
+        }
+
+        memcpy(info->solver, OFFSET(buf, INFO_OFFSET_SOLVER),
+            INFO_SOLVER_STRLEN);
+        info->infosize = *(const uint64_t *)OFFSET(buf, INFO_OFFSET_INFOSIZE);
+        info->fullsize = *(const uint64_t *)OFFSET(buf, INFO_OFFSET_FULLSIZE);
+        info->hash = *(const uint64_t *)OFFSET(buf, INFO_OFFSET_HASH);
+        info->entries = *(const uint64_t *)OFFSET(buf, INFO_OFFSET_ENTRIES);
+        info->bits = *OFFSET(buf, INFO_OFFSET_BITS);
+        info->base = *OFFSET(buf, INFO_OFFSET_BASE);
+        info->maxvalue = *OFFSET(buf, INFO_OFFSET_MAXVALUE);
+        memcpy(info->distribution, OFFSET(buf, INFO_OFFSET_DISTRIBUTION),
+            INFO_DISTRIBUTION_LEN * sizeof(uint64_t));
+
+        return true;
+}
+
+STATIC bool
+writetableinfo(const tableinfo_t *info, void *buf)
+{
+        int i;
+
+        if (buf == NULL) {
+                LOG("Error reading table: buffer in NULL\n");
+                return false;
+        }
+
+        if (info == NULL) {
+                LOG("Error writing table info: provided info is NULL\n");
+                return false;
+        }
+
+        memcpy(OFFSET(buf, INFO_OFFSET_SOLVER), info->solver,
+            INFO_SOLVER_STRLEN);
+
+        /* Zeroing all chars after the end of the string, for consistency */
+        for (i = 1; i < INFO_SOLVER_STRLEN; i++)
+                if (*OFFSET(buf, i) == 0)
+                        *OFFSET(buf, i) = 0;
+
+        *(uint64_t *)OFFSET(buf, INFO_OFFSET_INFOSIZE) = info->infosize;
+        *(uint64_t *)OFFSET(buf, INFO_OFFSET_FULLSIZE) = info->fullsize;
+        *(uint64_t *)OFFSET(buf, INFO_OFFSET_HASH) = info->hash;
+        *(uint64_t *)OFFSET(buf, INFO_OFFSET_ENTRIES) = info->entries;
+        *OFFSET(buf, INFO_OFFSET_BITS) = info->bits;
+        *OFFSET(buf, INFO_OFFSET_BASE) = info->base;
+        *OFFSET(buf, INFO_OFFSET_MAXVALUE) = info->maxvalue;
+
+        memcpy(OFFSET(buf, INFO_OFFSET_DISTRIBUTION), info->distribution,
+            INFO_DISTRIBUTION_LEN * sizeof(uint64_t));
+
+        return true;
+}