36 lines
1.6 KiB
C
36 lines
1.6 KiB
C
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/**********************************************************************
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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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void *data;
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size_t offset;
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size_t init_size;
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size_t max_size;
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const secp256k1_callback* error_callback;
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} secp256k1_scratch;
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static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t init_size, size_t max_size);
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static void secp256k1_scratch_destroy(secp256k1_scratch* scratch);
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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_scratch* scratch, size_t n_objects);
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/** Attempts to allocate so that there are `n` available bytes. Returns 1 on success, 0 on failure */
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static int secp256k1_scratch_resize(secp256k1_scratch* scratch, size_t n, size_t n_objects);
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/** Returns a pointer into the scratch space or NULL if there is insufficient available space */
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static void *secp256k1_scratch_alloc(secp256k1_scratch* scratch, size_t n);
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/** Resets the returned pointer to the beginning of space */
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static void secp256k1_scratch_reset(secp256k1_scratch* scratch);
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#endif
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