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Alignment support by Pieter Wuille.
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Original file line number | Diff line number | Diff line change |
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/********************************************************************** | ||
* Copyright (c) 2017 Andrew Poelstra * | ||
* Distributed under the MIT software license, see the accompanying * | ||
* file COPYING or http://www.opensource.org/licenses/mit-license.php.* | ||
**********************************************************************/ | ||
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#ifndef _SECP256K1_SCRATCH_ | ||
#define _SECP256K1_SCRATCH_ | ||
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/* The typedef is used internally; the struct name is used in the public API | ||
* (where it is exposed as a different typedef) */ | ||
typedef struct secp256k1_scratch_space_struct { | ||
void *data; | ||
size_t offset; | ||
size_t init_size; | ||
size_t max_size; | ||
const secp256k1_callback* error_callback; | ||
} 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); | ||
static void secp256k1_scratch_destroy(secp256k1_scratch* scratch); | ||
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/** Returns the maximum allocation the scratch space will allow */ | ||
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 */ | ||
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 */ | ||
static void *secp256k1_scratch_alloc(secp256k1_scratch* scratch, size_t n); | ||
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/** Resets the returned pointer to the beginning of space */ | ||
static void secp256k1_scratch_reset(secp256k1_scratch* scratch); | ||
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#endif |
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Original file line number | Diff line number | Diff line change |
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/********************************************************************** | ||
* Copyright (c) 2017 Andrew Poelstra * | ||
* Distributed under the MIT software license, see the accompanying * | ||
* file COPYING or http://www.opensource.org/licenses/mit-license.php.* | ||
**********************************************************************/ | ||
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#ifndef _SECP256K1_SCRATCH_IMPL_H_ | ||
#define _SECP256K1_SCRATCH_IMPL_H_ | ||
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#include "scratch.h" | ||
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/* Using 16 bytes alignment because common architectures never have alignment | ||
* requirements above 8 for any of the types we care about. In addition we | ||
* leave some room because currently we don't care about a few bytes. | ||
* TODO: Determine this at configure time. */ | ||
#define ALIGNMENT 16 | ||
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static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t init_size, size_t max_size) { | ||
secp256k1_scratch* ret = (secp256k1_scratch*)checked_malloc(error_callback, sizeof(*ret)); | ||
if (ret != NULL) { | ||
ret->data = checked_malloc(error_callback, init_size); | ||
if (ret->data == NULL) { | ||
free (ret); | ||
return NULL; | ||
} | ||
ret->offset = 0; | ||
ret->init_size = init_size; | ||
ret->max_size = max_size; | ||
ret->error_callback = error_callback; | ||
} | ||
return ret; | ||
} | ||
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static void secp256k1_scratch_destroy(secp256k1_scratch* scratch) { | ||
if (scratch != NULL) { | ||
free(scratch->data); | ||
free(scratch); | ||
} | ||
} | ||
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static size_t secp256k1_scratch_max_allocation(const secp256k1_scratch* scratch, size_t objects) { | ||
if (scratch->max_size <= objects * ALIGNMENT) { | ||
return 0; | ||
} | ||
return scratch->max_size - objects * ALIGNMENT; | ||
} | ||
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static int secp256k1_scratch_resize(secp256k1_scratch* scratch, size_t n, size_t objects) { | ||
n += objects * ALIGNMENT; | ||
if (n > scratch->init_size && n <= scratch->max_size) { | ||
void *tmp = checked_realloc(scratch->error_callback, scratch->data, n); | ||
if (tmp == NULL) { | ||
return 0; | ||
} | ||
scratch->init_size = n; | ||
scratch->data = tmp; | ||
} | ||
return n <= scratch->max_size; | ||
} | ||
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static void *secp256k1_scratch_alloc(secp256k1_scratch* scratch, size_t size) { | ||
void *ret; | ||
size = ((size + ALIGNMENT - 1) / ALIGNMENT) * ALIGNMENT; | ||
if (size + scratch->offset > scratch->init_size) { | ||
return NULL; | ||
} | ||
ret = (void *) ((unsigned char *) scratch->data + scratch->offset); | ||
memset(ret, 0, size); | ||
scratch->offset += size; | ||
return ret; | ||
} | ||
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static void secp256k1_scratch_reset(secp256k1_scratch* scratch) { | ||
scratch->offset = 0; | ||
} | ||
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#endif |
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