[PATCH 01/10] test-dump: new test program to examine binary data
- From
Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
- Date
- Sep 26, 2013, 02:26 UTC
- Message-ID
- <1380162409-18224-2-git-send-email-pclouds@gmail.com>
- In-Reply-To
- <1380162409-18224-1-git-send-email-pclouds@gmail.com>
This will come handy for verifying binary files like .pack, .idx or $GIT_DIR/index. For now the only supported command is "ntohl". This command looks into the given file at the given offset, do ntohl() and return the value in decimal.
More commands may be added later to decode varint, or decompress a zlib stream and so on...
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> --- .gitignore | 1 + Makefile | 1 + test-dump.c (new) | 27 +++++++++++++++++++++++++++ 3 files changed, 29 insertions(+) create mode 100644 test-dump.c
diff --git a/.gitignore b/.gitignore index 2e2ae2b..6d835e2 100644 --- a/.gitignore +++ b/.gitignore @@ -182,6 +182,7 @@ /test-ctype /test-date /test-delta +/test-dump /test-dump-cache-tree /test-scrap-cache-tree /test-genrandom diff --git a/Makefile b/Makefile index af2e3e3..a07a194 100644 --- a/Makefile +++ b/Makefile @@ -560,6 +560,7 @@ TEST_PROGRAMS_NEED_X += test-chmtime TEST_PROGRAMS_NEED_X += test-ctype TEST_PROGRAMS_NEED_X += test-date TEST_PROGRAMS_NEED_X += test-delta +TEST_PROGRAMS_NEED_X += test-dump TEST_PROGRAMS_NEED_X += test-dump-cache-tree TEST_PROGRAMS_NEED_X += test-genrandom TEST_PROGRAMS_NEED_X += test-index-version diff --git a/test-dump.c b/test-dump.c new file mode 100644 index 0000000..71c6f8f --- /dev/null +++ b/test-dump.c @@ -0,0 +1,27 @@ +#include "cache.h" + +static inline uint32_t ntoh_l_force_align(void *p) +{ + uint32_t x; + memcpy(&x, p, sizeof(x)); + return ntohl(x); +} + +int main(int ac, char **av) +{ + unsigned char *p; + int fd = open(av[2], O_RDONLY); + struct stat st; + if (lstat(av[2], &st)) + return 1; + p = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); + if (p == (unsigned char*)MAP_FAILED) + return 2; + if (!strcmp(av[1], "ntohl")) + printf("%u\n", ntoh_l_force_align(p + atoi(av[3]))); + else { + fprintf(stderr, "unknown command %s\n", av[1]); + return 3; + } + return 0; +}
-- 1.8.2.82.gc24b958