40 lines
1.7 KiB
C
40 lines
1.7 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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#define SECP256K1_SCRATCH_MAX_FRAMES 5
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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[SECP256K1_SCRATCH_MAX_FRAMES];
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size_t offset[SECP256K1_SCRATCH_MAX_FRAMES];
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size_t frame_size[SECP256K1_SCRATCH_MAX_FRAMES];
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size_t frame;
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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 max_size);
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static void secp256k1_scratch_destroy(secp256k1_scratch* scratch);
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/** Attempts to allocate a new stack frame with `n` available bytes. Returns 1 on success, 0 on failure */
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static int secp256k1_scratch_allocate_frame(secp256k1_scratch* scratch, size_t n, size_t objects);
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/** Deallocates a stack frame */
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static void secp256k1_scratch_deallocate_frame(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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/** 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(secp256k1_scratch* scratch, size_t n);
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#endif
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