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[ota] Collapse Mach-O 32/64 paths

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cputype/cpusubtype/filetype have identical offsets in mach_header and
mach_header_64. Read the common prefix once and dispatch only on
endianness; drops the unused mach-o/fat.h include.
This commit is contained in:
J. Nick Koston
2026-05-07 18:46:36 -05:00
parent 2622595c31
commit 11a8e8866d
1 changed files with 20 additions and 32 deletions
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esphome/components/ota/ota_backend_host.cpp
+20 -32
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@@ -20,7 +20,6 @@
#endif
#ifdef __APPLE__
#include <mach-o/fat.h>
#include <mach-o/loader.h>
#endif
@@ -125,43 +124,32 @@ struct MachOIdent {
MachOIdent parse_macho_(const uint8_t *buf, size_t len) {
MachOIdent out{};
if (len < sizeof(struct mach_header_64))
// mach_header is the common prefix of mach_header and mach_header_64;
// cputype/cpusubtype/filetype have identical offsets in both.
if (len < sizeof(struct mach_header))
return out;
uint32_t magic;
std::memcpy(&magic, buf, sizeof(magic));
// Thin Mach-O only; the running exe is also thin (slice path).
if (magic == MH_MAGIC_64 || magic == MH_CIGAM_64) {
struct mach_header_64 hdr;
std::memcpy(&hdr, buf, sizeof(hdr));
if (magic == MH_CIGAM_64) {
hdr.cputype = OSSwapInt32(hdr.cputype);
hdr.cpusubtype = OSSwapInt32(hdr.cpusubtype);
hdr.filetype = OSSwapInt32(hdr.filetype);
}
if (hdr.filetype != MH_EXECUTE)
return out;
out.cputype = hdr.cputype;
out.cpusubtype = hdr.cpusubtype;
out.valid = true;
bool swap;
if (magic == MH_MAGIC || magic == MH_MAGIC_64) {
swap = false;
} else if (magic == MH_CIGAM || magic == MH_CIGAM_64) {
swap = true;
} else {
return out;
}
if (magic == MH_MAGIC || magic == MH_CIGAM) {
if (len < sizeof(struct mach_header))
return out;
struct mach_header hdr;
std::memcpy(&hdr, buf, sizeof(hdr));
if (magic == MH_CIGAM) {
hdr.cputype = OSSwapInt32(hdr.cputype);
hdr.cpusubtype = OSSwapInt32(hdr.cpusubtype);
hdr.filetype = OSSwapInt32(hdr.filetype);
}
if (hdr.filetype != MH_EXECUTE)
return out;
out.cputype = hdr.cputype;
out.cpusubtype = hdr.cpusubtype;
out.valid = true;
return out;
struct mach_header hdr;
std::memcpy(&hdr, buf, sizeof(hdr));
if (swap) {
hdr.cputype = OSSwapInt32(hdr.cputype);
hdr.cpusubtype = OSSwapInt32(hdr.cpusubtype);
hdr.filetype = OSSwapInt32(hdr.filetype);
}
if (hdr.filetype != MH_EXECUTE)
return out;
out.cputype = hdr.cputype;
out.cpusubtype = hdr.cpusubtype;
out.valid = true;
return out;
}