Update project structure and build process

libwallet/musig/scratch_impl.h

@@ -0,0 +1,99 @@
+/***********************************************************************
+ * Copyright (c) 2017 Andrew Poelstra                                  *
+ * Distributed under the MIT software license, see the accompanying    *
+ * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
+ ***********************************************************************/
+
+#ifndef SECP256K1_SCRATCH_IMPL_H
+#define SECP256K1_SCRATCH_IMPL_H
+
+#include "util.h"
+#include "scratch.h"
+
+static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t size) {
+    const size_t base_alloc = ROUND_TO_ALIGN(sizeof(secp256k1_scratch));
+    void *alloc = checked_malloc(error_callback, base_alloc + size);
+    secp256k1_scratch* ret = (secp256k1_scratch *)alloc;
+    if (ret != NULL) {
+        memset(ret, 0, sizeof(*ret));
+        memcpy(ret->magic, "scratch", 8);
+        ret->data = (void *) ((char *) alloc + base_alloc);
+        ret->max_size = size;
+    }
+    return ret;
+}
+
+static void secp256k1_scratch_destroy(const secp256k1_callback* error_callback, secp256k1_scratch* scratch) {
+    if (scratch != NULL) {
+        VERIFY_CHECK(scratch->alloc_size == 0); /* all checkpoints should be applied */
+        if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
+            secp256k1_callback_call(error_callback, "invalid scratch space");
+            return;
+        }
+        memset(scratch->magic, 0, sizeof(scratch->magic));
+        free(scratch);
+    }
+}
+
+static size_t secp256k1_scratch_checkpoint(const secp256k1_callback* error_callback, const secp256k1_scratch* scratch) {
+    if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
+        secp256k1_callback_call(error_callback, "invalid scratch space");
+        return 0;
+    }
+    return scratch->alloc_size;
+}
+
+static void secp256k1_scratch_apply_checkpoint(const secp256k1_callback* error_callback, secp256k1_scratch* scratch, size_t checkpoint) {
+    if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
+        secp256k1_callback_call(error_callback, "invalid scratch space");
+        return;
+    }
+    if (checkpoint > scratch->alloc_size) {
+        secp256k1_callback_call(error_callback, "invalid checkpoint");
+        return;
+    }
+    scratch->alloc_size = checkpoint;
+}
+
+static size_t secp256k1_scratch_max_allocation(const secp256k1_callback* error_callback, const secp256k1_scratch* scratch, size_t objects) {
+    if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
+        secp256k1_callback_call(error_callback, "invalid scratch space");
+        return 0;
+    }
+    /* Ensure that multiplication will not wrap around */
+    if (ALIGNMENT > 1 && objects > SIZE_MAX/(ALIGNMENT - 1)) {
+        return 0;
+    }
+    if (scratch->max_size - scratch->alloc_size <= objects * (ALIGNMENT - 1)) {
+        return 0;
+    }
+    return scratch->max_size - scratch->alloc_size - objects * (ALIGNMENT - 1);
+}
+
+static void *secp256k1_scratch_alloc(const secp256k1_callback* error_callback, secp256k1_scratch* scratch, size_t size) {
+    void *ret;
+    size_t rounded_size;
+
+    rounded_size = ROUND_TO_ALIGN(size);
+    /* Check that rounding did not wrap around */
+    if (rounded_size < size) {
+        return NULL;
+    }
+    size = rounded_size;
+
+    if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
+        secp256k1_callback_call(error_callback, "invalid scratch space");
+        return NULL;
+    }
+
+    if (size > scratch->max_size - scratch->alloc_size) {
+        return NULL;
+    }
+    ret = (void *) ((char *) scratch->data + scratch->alloc_size);
+    memset(ret, 0, size);
+    scratch->alloc_size += size;
+
+    return ret;
+}
+
+#endif