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Add properties to SDL_IOStreams returned by IOFromMem

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Ethan Lee 2024-10-01 17:50:59 -04:00 • committed by Sam Lantinga
parent 1bb7e2b1a8
commit a0de6c4abf
2 changed files with 29 additions and 0 deletions
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17
include/SDL3/SDL_iostream.h
View file

@ -291,6 +291,13 @@ extern SDL_DECLSPEC SDL_IOStream * SDLCALL SDL_IOFromFile(const char *file, cons
* buffer, you should use SDL_IOFromConstMem() with a read-only buffer of
* memory instead.
*
* The following properties will be set at creation time by SDL:
*
* - `SDL_PROP_IOSTREAM_MEMORY_POINTER`: this will be the `mem` parameter that
* was passed to this function.
* - `SDL_PROP_IOSTREAM_MEMORY_SIZE_NUMBER`: this will be the `size` parameter
* that was passed to this function.
*
* \param mem a pointer to a buffer to feed an SDL_IOStream stream.
* \param size the buffer size, in bytes.
* \returns a pointer to a new SDL_IOStream structure or NULL on failure; call
@ -308,6 +315,9 @@ extern SDL_DECLSPEC SDL_IOStream * SDLCALL SDL_IOFromFile(const char *file, cons
*/
extern SDL_DECLSPEC SDL_IOStream * SDLCALL SDL_IOFromMem(void *mem, size_t size);
#define SDL_PROP_IOSTREAM_MEMORY_POINTER "SDL.iostream.memory.base"
#define SDL_PROP_IOSTREAM_MEMORY_SIZE_NUMBER "SDL.iostream.memory.size"
/**
* Use this function to prepare a read-only memory buffer for use with
* SDL_IOStream.
@ -325,6 +335,13 @@ extern SDL_DECLSPEC SDL_IOStream * SDLCALL SDL_IOFromMem(void *mem, size_t size)
* If you need to write to a memory buffer, you should use SDL_IOFromMem()
* with a writable buffer of memory instead.
*
* The following properties will be set at creation time by SDL:
*
* - `SDL_PROP_IOSTREAM_MEMORY_POINTER`: this will be the `mem` parameter that
* was passed to this function.
* - `SDL_PROP_IOSTREAM_MEMORY_SIZE_NUMBER`: this will be the `size` parameter
* that was passed to this function.
*
* \param mem a pointer to a read-only buffer to feed an SDL_IOStream stream.
* \param size the buffer size, in bytes.
* \returns a pointer to a new SDL_IOStream structure or NULL on failure; call

12
src/file/SDL_iostream.c
View file

@ -793,6 +793,12 @@ SDL_IOStream *SDL_IOFromMem(void *mem, size_t size)
SDL_IOStream *iostr = SDL_OpenIO(&iface, iodata);
if (!iostr) {
SDL_free(iodata);
} else {
const SDL_PropertiesID props = SDL_GetIOProperties(iostr);
if (props) {
SDL_SetPointerProperty(props, SDL_PROP_IOSTREAM_MEMORY_POINTER, mem);
SDL_SetNumberProperty(props, SDL_PROP_IOSTREAM_MEMORY_SIZE_NUMBER, size);
}
}
return iostr;
}
@ -827,6 +833,12 @@ SDL_IOStream *SDL_IOFromConstMem(const void *mem, size_t size)
SDL_IOStream *iostr = SDL_OpenIO(&iface, iodata);
if (!iostr) {
SDL_free(iodata);
} else {
const SDL_PropertiesID props = SDL_GetIOProperties(iostr);
if (props) {
SDL_SetPointerProperty(props, SDL_PROP_IOSTREAM_MEMORY_POINTER, (void *)mem);
SDL_SetNumberProperty(props, SDL_PROP_IOSTREAM_MEMORY_SIZE_NUMBER, size);
}
}
return iostr;
}