78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
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#include "magiskboot.h"
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#include "elf.h"
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void mmap_ro(const char *filename, unsigned char **buf, size_t *size) {
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int fd = open(filename, O_RDONLY);
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if (fd < 0)
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error(1, "Cannot open %s", filename);
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*size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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*buf = mmap(NULL, *size, PROT_READ, MAP_SHARED, fd, 0);
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close(fd);
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}
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void mmap_rw(const char *filename, unsigned char **buf, size_t *size) {
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int fd = open(filename, O_RDWR);
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if (fd < 0)
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error(1, "Cannot open %s", filename);
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*size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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*buf = mmap(NULL, *size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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close(fd);
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}
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file_t check_type(const unsigned char *buf) {
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if (memcmp(buf, CHROMEOS_MAGIC, CHROMEOS_MAGIC_SIZE) == 0) {
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return CHROMEOS;
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} else if (memcmp(buf, BOOT_MAGIC, BOOT_MAGIC_SIZE) == 0) {
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return AOSP;
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} else if (memcmp(buf, ELF_MAGIC, ELF_MAGIC_SIZE) == 0) {
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return ELF;
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} else if (memcmp(buf, "\x1f\x8b\x08\x00", 4) == 0) {
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return GZIP;
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} else if (memcmp(buf, "\x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a", 9) == 0) {
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return LZOP;
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} else if (memcmp(buf, "\xfd""7zXZ\x00", 6) == 0) {
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return XZ;
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} else if (memcmp(buf, "\x5d\x00\x00", 3) == 0
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&& (buf[12] == (unsigned char) '\xff' || buf[12] == (unsigned char) '\x00')) {
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return LZMA;
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} else if (memcmp(buf, "BZh", 3) == 0) {
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return BZIP2;
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} else if ( ( memcmp(buf, "\x04\x22\x4d\x18", 4) == 0
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|| memcmp(buf, "\x03\x21\x4c\x18", 4) == 0)
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|| memcmp(buf, "\x02\x21\x4c\x18", 4) == 0) {
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return LZ4;
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} else if (memcmp(buf, "\x88\x16\x88\x58", 4) == 0) {
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return MTK;
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} else if (memcmp(buf, "QCDT", 4) == 0) {
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return QCDT;
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} else {
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return UNKNOWN;
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}
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}
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void mem_align(size_t *pos, size_t align) {
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size_t mask = align - 1;
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if (*pos & mask) {
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*pos += align - (*pos & mask);
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}
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}
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void file_align(int fd, size_t align) {
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size_t pos = lseek(fd, 0, SEEK_CUR);
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size_t mask = align - 1;
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if (pos & mask) {
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pos += align - (pos & mask);
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ftruncate(fd, pos);
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lseek(fd, 0, SEEK_END);
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}
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}
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int open_new(const char *filename) {
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int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if (fd < 0)
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error(1, "Unable to create %s", filename);
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return fd;
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}
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