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libobs/callback: Allow ability to use calldata_t with stack
Allows the ability to use fixed stack memory to construct a calldata_t structure rather than having to allocate each time. This is fine to do for certain signals where the calldata never goes above a specific size. If by some chance the size is insufficient, it will output a log message.
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@ -17,6 +17,7 @@
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#include <string.h>
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#include "../util/bmem.h"
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#include "../util/base.h"
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#include "calldata.h"
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@ -137,14 +138,18 @@ static inline void cd_set_first_param(calldata_t *data, const char *name,
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memset(pos, 0, sizeof(size_t));
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}
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static inline void cd_ensure_capacity(calldata_t *data, uint8_t **pos,
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static inline bool cd_ensure_capacity(calldata_t *data, uint8_t **pos,
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size_t new_size)
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{
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size_t offset;
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size_t new_capacity;
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if (new_size < data->capacity)
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return;
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return true;
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if (data->fixed) {
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blog(LOG_ERROR, "Tried to go above fixed calldata stack size!");
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return false;
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}
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offset = *pos - data->stack;
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@ -156,6 +161,7 @@ static inline void cd_ensure_capacity(calldata_t *data, uint8_t **pos,
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data->capacity = new_capacity;
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*pos = data->stack + offset;
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return true;
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}
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/* ------------------------------------------------------------------------- */
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@ -188,7 +194,7 @@ void calldata_set_data(calldata_t *data, const char *name, const void *in,
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if (!data || !name || !*name)
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return;
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if (!data->stack) {
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if (!data->fixed && !data->stack) {
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cd_set_first_param(data, name, in, size);
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return;
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}
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@ -201,7 +207,8 @@ void calldata_set_data(calldata_t *data, const char *name, const void *in,
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size_t offset = size - cur_size;
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size_t bytes = data->size;
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cd_ensure_capacity(data, &pos, bytes + offset);
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if (!cd_ensure_capacity(data, &pos, bytes + offset))
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return;
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memmove(pos+offset, pos, bytes - (pos - data->stack));
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data->size += offset;
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@ -218,7 +225,8 @@ void calldata_set_data(calldata_t *data, const char *name, const void *in,
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} else {
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size_t name_len = strlen(name)+1;
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size_t offset = name_len + size + sizeof(size_t)*2;
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cd_ensure_capacity(data, &pos, data->size + offset);
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if (!cd_ensure_capacity(data, &pos, data->size + offset))
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return;
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data->size += offset;
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cd_copy_string(&pos, name, 0);
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@ -44,9 +44,10 @@ enum call_param_type {
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#define CALL_PARAM_OUT (1<<1)
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struct calldata {
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uint8_t *stack;
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size_t size; /* size of the stack, in bytes */
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size_t capacity; /* capacity of the stack, in bytes */
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uint8_t *stack;
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bool fixed; /* fixed size (using call stack) */
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};
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typedef struct calldata calldata_t;
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@ -56,8 +57,21 @@ static inline void calldata_init(struct calldata *data)
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memset(data, 0, sizeof(struct calldata));
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}
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static inline void calldata_clear(struct calldata *data);
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static inline void calldata_init_fixed(struct calldata *data, uint8_t *stack,
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size_t size)
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{
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data->stack = stack;
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data->capacity = size;
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data->fixed = true;
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data->size = 0;
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calldata_clear(data);
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}
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static inline void calldata_free(struct calldata *data)
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{
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if (!data->fixed)
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bfree(data->stack);
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}
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