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99de7b943f
Each file that contains copied code names its copyright holder and license and points at THIRD_PARTY_NOTICES.md; zlib code keeps its full notice and the mark that it was altered. Comments and probe text only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
47 lines
2.1 KiB
C
47 lines
2.1 KiB
C
// Contains code Copyright (c) 2026 MacNativeGames contributors (MIT; see THIRD_PARTY_NOTICES.md).
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// RomFS path validation shared by the runtime (romfs.c) and its probe (fs_host.c probe_fs).
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#pragma once
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#include <stddef.h>
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#include <string.h>
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// A RomFS-relative path: non-empty, no leading '/', no '\', no empty, "." or ".." component.
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static inline int romfs_path_valid_relative(const char *path) {
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if (!path || !*path || *path == '/' || strchr(path, '\\')) return 0;
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for (const char *part = path; *part;) {
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const char *end = strchr(part, '/');
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size_t size = end ? (size_t)(end - part) : strlen(part);
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if (!size || (size == 1 && part[0] == '.') || (size == 2 && part[0] == '.' && part[1] == '.')) return 0;
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if (!end) break;
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part = end + 1;
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}
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return 1;
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}
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// Copies path into out (cap bytes) with each run of '/' after the first ':' folded into one, as a file system
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// reads "a//b". Switch 2 voice requests join "Voice/Resource/" and "/Stream/..." (Ocarina's
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// "content://Voice/Resource//Stream/USen_...bwav"). 0 when it does not fit.
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static inline int romfs_path_collapse(const char *path, char *out, size_t cap) {
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const char *colon = path ? strchr(path, ':') : NULL;
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size_t n = 0;
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for (const char *p = path; p && *p; p++) {
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if (colon && p > colon + 1 && *p == '/' && p[-1] == '/') continue; // keep "<mount>:/" and one more
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if (n + 1 >= cap) return 0;
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out[n++] = *p;
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}
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if (!cap) return 0;
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out[n] = 0;
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return 1;
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}
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// "<mount>:/<path>" -> "<path>", or NULL. Audio stream requests join a mount root and a leading-slash resource,
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// producing "content://Sound/...": repeated root separators are skipped; traversal, backslashes and empty interior
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// components are still rejected.
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static inline const char *romfs_path_relative(const char *mount, const char *path) {
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if (!mount || !*mount || !path) return NULL;
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size_t size = strlen(mount);
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if (strncmp(path, mount, size) || path[size] != ':' || path[size + 1] != '/') return NULL;
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path += size + 2;
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while (*path == '/') ++path;
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return romfs_path_valid_relative(path) ? path : NULL;
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}
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