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Add DHTB header support

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topjohnwu
2018-01-29 22:16:02 +08:00
parent a58d3ea04d
commit 7cfc24d68f
7 changed files with 150 additions and 88 deletions
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12
native/jni/utils/cpio.c
View File

@@ -56,6 +56,7 @@ void cpio_vec_insert(struct vector *v, cpio_entry *n) {
}
// Parse cpio file to a vector of cpio_entry
#define parse_align() lseek(fd, align(lseek(fd, 0, SEEK_CUR), 4), SEEK_SET)
void parse_cpio(struct vector *v, const char *filename) {
int fd = open(filename, O_RDONLY);
if (fd < 0) return;
@@ -79,7 +80,7 @@ void parse_cpio(struct vector *v, const char *filename) {
// f->check = x8u(header.check);
f->filename = xmalloc(namesize);
xxread(fd, f->filename, namesize);
file_align(fd, 4, 0);
parse_align();
if (strcmp(f->filename, ".") == 0 || strcmp(f->filename, "..") == 0) {
cpio_free(f);
continue;
@@ -91,13 +92,14 @@ void parse_cpio(struct vector *v, const char *filename) {
if (f->filesize) {
f->data = xmalloc(f->filesize);
xxread(fd, f->data, f->filesize);
file_align(fd, 4, 0);
parse_align();
}
vec_push_back(v, f);
}
close(fd);
}
#define dump_align() write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR), 4))
void dump_cpio(struct vector *v, const char *filename) {
fprintf(stderr, "Dump cpio: [%s]\n", filename);
unsigned inode = 300000;
@@ -124,17 +126,17 @@ void dump_cpio(struct vector *v, const char *filename) {
);
xwrite(fd, header, 110);
xwrite(fd, e->filename, strlen(e->filename) + 1);
file_align(fd, 4, 1);
dump_align();
if (e->filesize) {
xwrite(fd, e->data, e->filesize);
file_align(fd, 4, 1);
dump_align();
}
}
// Write trailer
sprintf(header, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x", inode++, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 11, 0);
xwrite(fd, header, 110);
xwrite(fd, "TRAILER!!!\0", 11);
file_align(fd, 4, 1);
dump_align();
close(fd);
}

21
native/jni/utils/file.c
View File

@@ -424,24 +424,3 @@ void write_zero(int fd, size_t size) {
ftruncate(fd, pos + size);
lseek(fd, pos + size, SEEK_SET);
}
void mem_align(size_t *pos, size_t align) {
size_t mask = align - 1;
if (*pos & mask) {
*pos += align - (*pos & mask);
}
}
void file_align(int fd, size_t align, int out) {
size_t pos = lseek(fd, 0, SEEK_CUR);
size_t mask = align - 1;
size_t off;
if (pos & mask) {
off = align - (pos & mask);
if (out) {
write_zero(fd, off);
} else {
lseek(fd, pos + off, SEEK_SET);
}
}
}