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authorTimo Teräs <timo.teras@iki.fi>2017-01-10 14:16:16 +0200
committerTimo Teräs <timo.teras@iki.fi>2017-01-10 14:16:16 +0200
commit6926e206a82f7cebd5827d3493e988b1d95046db (patch)
tree25354d16ca63c3f4460e16cfd2cc277056081ec9 /abuild-gzsplit.c
parent8bddd02b10cd581f0f0966375a93180b0cb2bb33 (diff)
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abuild-gzsplit: new tool to split .apk to it's base components
required tool for re-signing packages
Diffstat (limited to 'abuild-gzsplit.c')
-rw-r--r--abuild-gzsplit.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/abuild-gzsplit.c b/abuild-gzsplit.c
new file mode 100644
index 0000000..5e7a698
--- /dev/null
+++ b/abuild-gzsplit.c
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <zlib.h>
+
+int main(void)
+{
+ char obuf[8*1024], ibuf[8*1024];
+ z_stream zs;
+ int r = Z_OK, rc = 1, fd = -1;
+ size_t len;
+
+ if (inflateInit2(&zs, 15+32) != Z_OK)
+ goto err;
+
+ zs.avail_out = sizeof obuf;
+ zs.next_out = obuf;
+
+ while (1) {
+ if (zs.avail_in == 0) {
+ zs.avail_in = read(STDIN_FILENO, ibuf, sizeof ibuf);
+ zs.next_in = ibuf;
+ if (zs.avail_in < 0) goto err;
+ if (zs.avail_in == 0 && r == Z_STREAM_END) goto ok;
+ }
+
+ r = inflate(&zs, Z_NO_FLUSH);
+ if (r != Z_OK && r != Z_STREAM_END) goto err;
+
+ len = sizeof obuf - zs.avail_out;
+ if (len) {
+ if (fd < 0) {
+ const char *fn;
+ if (strncmp(obuf, ".SIGN.", 6) == 0)
+ fn = "signatures.tar.gz";
+ else if (strncmp(obuf, ".PKGINFO", 8) == 0)
+ fn = "control.tar.gz";
+ else if (rc == 1)
+ fn = "data.tar.gz", rc = 2;
+ else
+ goto err;
+ fd = open(fn, O_CREAT|O_TRUNC|O_WRONLY, 0777);
+ if (fd < 0) goto err;
+ }
+ zs.next_out = obuf;
+ zs.avail_out = sizeof obuf;
+ }
+
+ if (zs.avail_in == 0 || r == Z_STREAM_END) {
+ len = (void *)zs.next_in - (void *)ibuf;
+ if (write(fd, ibuf, len) != len) goto err;
+ memmove(ibuf, zs.next_in, zs.avail_in);
+ zs.next_in = ibuf;
+ }
+
+ if (r == Z_STREAM_END) {
+ if (fd >= 0) {
+ close(fd);
+ fd = -1;
+ }
+ inflateEnd(&zs);
+ if (inflateInit2(&zs, 15+32) != Z_OK) goto err;
+ }
+ }
+ok:
+ rc = 0;
+err:
+ if (fd >= 0) close(fd);
+ inflateEnd(&zs);
+ if (rc) fprintf(stderr, "failed\n");
+ return rc;
+}
+