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libobs/util: Add seeking support to array serializer

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This commit is contained in:
derrod 2024-04-26 21:48:53 +02:00 committed by Lain
parent 842d249cb9
commit dc4cba7427
3 changed files with 63 additions and 1 deletions
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10
docs/sphinx/reference-libobs-util-serializers.rst
View File

@ -95,6 +95,9 @@ Array Output Serializer
Provides an output serializer used with dynamic arrays.
.. versionchanged:: 30.2
Array output serializer now supports seeking.
.. code:: cpp
#include <util/array-serializer.h>
@ -119,6 +122,13 @@ Array Output Serializer Functions
---------------------
.. function:: void array_output_serializer_reset(struct array_output_data *data)
Resets serializer without freeing data.
.. versionadded:: 30.2
---------------------
File Input/Output Serializers
=============================

52
libobs/util/array-serializer.c
View File

@ -20,7 +20,23 @@
static size_t array_output_write(void *param, const void *data, size_t size)
{
struct array_output_data *output = param;
da_push_back_array(output->bytes, (uint8_t *)data, size);
if (output->cur_pos < output->bytes.num) {
size_t new_size = output->cur_pos + size;
if (new_size > output->bytes.num) {
darray_ensure_capacity(sizeof(uint8_t),
&output->bytes.da, new_size);
output->bytes.num = new_size;
}
memcpy(output->bytes.array + output->cur_pos, data, size);
output->cur_pos += size;
} else {
da_push_back_array(output->bytes, (uint8_t *)data, size);
output->cur_pos += size;
}
return size;
}
@ -30,6 +46,33 @@ static int64_t array_output_get_pos(void *param)
return (int64_t)data->bytes.num;
}
static int64_t array_output_seek(void *param, int64_t offset,
enum serialize_seek_type seek_type)
{
struct array_output_data *output = param;
size_t new_pos = 0;
switch (seek_type) {
case SERIALIZE_SEEK_START:
new_pos = offset;
break;
case SERIALIZE_SEEK_CURRENT:
new_pos = output->cur_pos + offset;
break;
case SERIALIZE_SEEK_END:
new_pos = output->bytes.num - offset;
break;
}
if (new_pos > output->bytes.num)
return -1;
output->cur_pos = new_pos;
return (int64_t)new_pos;
}
void array_output_serializer_init(struct serializer *s,
struct array_output_data *data)
{
@ -38,9 +81,16 @@ void array_output_serializer_init(struct serializer *s,
s->data = data;
s->write = array_output_write;
s->get_pos = array_output_get_pos;
s->seek = array_output_seek;
}
void array_output_serializer_free(struct array_output_data *data)
{
da_free(data->bytes);
}
void array_output_serializer_reset(struct array_output_data *data)
{
da_clear(data->bytes);
data->cur_pos = 0;
}

2
libobs/util/array-serializer.h
View File

@ -25,11 +25,13 @@ extern "C" {
struct array_output_data {
DARRAY(uint8_t) bytes;
size_t cur_pos;
};
EXPORT void array_output_serializer_init(struct serializer *s,
struct array_output_data *data);
EXPORT void array_output_serializer_free(struct array_output_data *data);
EXPORT void array_output_serializer_reset(struct array_output_data *data);
#ifdef __cplusplus
}