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43 lines
2.1 KiB
43 lines
2.1 KiB
/**********************************************************************
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* Copyright (c) 2017 Andrew Poelstra *
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* Distributed under the MIT software license, see the accompanying *
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* file COPYING or http://www.opensource.org/licenses/mit-license.php.*
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**********************************************************************/
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#ifndef _SECP256K1_SCRATCH_
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#define _SECP256K1_SCRATCH_
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/* The typedef is used internally; the struct name is used in the public API
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* (where it is exposed as a different typedef) */
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typedef struct secp256k1_scratch_space_struct {
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/** guard against interpreting this object as other types */
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unsigned char magic[8];
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/** actual allocated data */
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void *data;
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/** amount that has been allocated (i.e. `data + offset` is the next
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* available pointer) */
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size_t alloc_size;
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/** maximum size available to allocate */
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size_t max_size;
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} secp256k1_scratch;
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static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t max_size);
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static void secp256k1_scratch_destroy(const secp256k1_callback* error_callback, secp256k1_scratch* scratch);
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/** Returns an opaque object used to "checkpoint" a scratch space. Used
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* with `secp256k1_scratch_apply_checkpoint` to undo allocations. */
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static size_t secp256k1_scratch_checkpoint(const secp256k1_callback* error_callback, const secp256k1_scratch* scratch);
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/** Applies a check point received from `secp256k1_scratch_checkpoint`,
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* undoing all allocations since that point. */
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static void secp256k1_scratch_apply_checkpoint(const secp256k1_callback* error_callback, secp256k1_scratch* scratch, size_t checkpoint);
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/** Returns the maximum allocation the scratch space will allow */
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static size_t secp256k1_scratch_max_allocation(const secp256k1_callback* error_callback, const secp256k1_scratch* scratch, size_t n_objects);
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/** Returns a pointer into the most recently allocated frame, or NULL if there is insufficient available space */
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static void *secp256k1_scratch_alloc(const secp256k1_callback* error_callback, secp256k1_scratch* scratch, size_t n);
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#endif
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