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Make SDL_URIToLocal available to multiple platforms

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Moves the functions out of core/unix into SDL_utils.c
This commit is contained in:
Frank Praznik
2024-07-19 11:42:53 -04:00
parent 6a62c54b93
commit 6a74ade73d
7 changed files with 127 additions and 182 deletions
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123
src/core/unix/SDL_uri_decode.c
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@@ -1,123 +0,0 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
#include "SDL_uri_decode.h"
#include <errno.h>
#include <unistd.h>
int SDL_URIDecode(const char *src, char *dst, int len)
{
int ri, wi, di;
char decode = '\0';
if (!src || !dst || len < 0) {
errno = EINVAL;
return -1;
}
if (len == 0) {
len = SDL_strlen(src);
}
for (ri = 0, wi = 0, di = 0; ri < len && wi < len; ri += 1) {
if (di == 0) {
/* start decoding */
if (src[ri] == '%') {
decode = '\0';
di += 1;
continue;
}
/* normal write */
dst[wi] = src[ri];
wi += 1;
continue;
} else if (di == 1 || di == 2) {
char off = '\0';
char isa = src[ri] >= 'a' && src[ri] <= 'f';
char isA = src[ri] >= 'A' && src[ri] <= 'F';
char isn = src[ri] >= '0' && src[ri] <= '9';
if (!(isa || isA || isn)) {
/* not a hexadecimal */
int sri;
for (sri = ri - di; sri <= ri; sri += 1) {
dst[wi] = src[sri];
wi += 1;
}
di = 0;
continue;
}
/* itsy bitsy magicsy */
if (isn) {
off = 0 - '0';
} else if (isa) {
off = 10 - 'a';
} else if (isA) {
off = 10 - 'A';
}
decode |= (src[ri] + off) << (2 - di) * 4;
if (di == 2) {
dst[wi] = decode;
wi += 1;
di = 0;
} else {
di += 1;
}
continue;
}
}
dst[wi] = '\0';
return wi;
}
int SDL_URIToLocal(const char *src, char *dst)
{
if (SDL_memcmp(src, "file:/", 6) == 0) {
src += 6; /* local file? */
} else if (SDL_strstr(src, ":/") != NULL) {
return -1; /* wrong scheme */
}
SDL_bool local = src[0] != '/' || (src[0] != '\0' && src[1] == '/');
/* got a hostname? */
if (!local && src[0] == '/' && src[2] != '/') {
char *hostname_end = SDL_strchr(src + 1, '/');
if (hostname_end) {
char hostname[257];
if (gethostname(hostname, 255) == 0) {
hostname[256] = '\0';
if (SDL_memcmp(src + 1, hostname, hostname_end - (src + 1)) == 0) {
src = hostname_end + 1;
local = SDL_TRUE;
}
}
}
}
if (local) {
/* Convert URI escape sequences to real characters */
if (src[0] == '/') {
src++;
} else {
src--;
}
return SDL_URIDecode(src, dst, 0);
}
return -1;
}

56
src/core/unix/SDL_uri_decode.h
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@@ -1,56 +0,0 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
#ifndef SDL_uri_decode_h_
#define SDL_uri_decode_h_
/* Decodes URI escape sequences in string src of len bytes
* (excluding the terminating NULL byte) into the dst buffer.
* Since URI-encoded characters take three times the space of
* normal characters, src and dst can safely point to the same
* buffer for in situ conversion.
*
* The buffer is guaranteed to be NULL-terminated, but
* may contain embedded NULL bytes.
*
* Returns the number of decoded bytes that wound up in
* the destination buffer, excluding the terminating NULL byte.
*
* On error, -1 is returned.
*/
int SDL_URIDecode(const char *src, char *dst, int len);
/* Convert URI to a local filename, stripping the "file://"
* preamble and hostname if present, and writes the result
* to the dst buffer. Since URI-encoded characters take
* three times the space of normal characters, src and dst
* can safely point to the same buffer for in situ conversion.
*
* Returns the number of decoded bytes that wound up in
* the destination buffer, excluding the terminating NULL byte.
*
* On error, -1 is returned;
*/
int SDL_URIToLocal(const char *src, char *dst);
#endif /* SDL_uri_decode_h_ */