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Support zImage compression types other than gzip.

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Instead of just searching for the gzip magic, it now incrementally searches the kernel for the first thing that `check_fmt_lg` doesn't report as `UNKNOWN`.
This commit is contained in:
David K. 2025-01-30 20:15:38 -05:00 committed by John Wu
parent 893821ad88
commit 0e82df9e10
1 changed files with 14 additions and 3 deletions
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17
native/src/boot/bootimg.cpp
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@ -431,9 +431,20 @@ bool boot_img::parse_image(const uint8_t *p, format_t type) {
}
if (k_fmt == ZIMAGE) {
z_hdr = reinterpret_cast<const zimage_hdr *>(kernel);
if (const void *gzip = memmem(kernel, hdr->kernel_size(), GZIP1_MAGIC "\x08\x00", 4)) {
const uint8_t* found_pos = 0;
for (const uint8_t* search_pos = kernel + 0x28; search_pos < kernel + hdr->kernel_size(); search_pos++) {
// ^^^^^^ +0x28 to search after zimage header and magic
if (check_fmt_lg(search_pos, hdr->kernel_size() - (search_pos - kernel)) != UNKNOWN) {
found_pos = search_pos;
search_pos = kernel + hdr->kernel_size();
}
}
if (found_pos != 0) {
fprintf(stderr, "ZIMAGE_KERNEL\n");
z_info.hdr_sz = (const uint8_t *) gzip - kernel;
z_info.hdr_sz = (const uint8_t *) found_pos - kernel;
// Find end of piggy
uint32_t zImage_size = z_hdr->end - z_hdr->start;
@ -457,7 +468,7 @@ bool boot_img::parse_image(const uint8_t *p, format_t type) {
k_fmt = check_fmt_lg(kernel, hdr->kernel_size());
}
} else {
fprintf(stderr, "! Could not find zImage gzip piggy, keeping raw kernel\n");
fprintf(stderr, "! Could not find zImage piggy, keeping raw kernel\n");
}
}
fprintf(stderr, "%-*s [%s]\n", PADDING, "KERNEL_FMT", fmt2name[k_fmt]);