diff options
Diffstat (limited to 'lib/test_hexdump.c')
| -rw-r--r-- | lib/test_hexdump.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/lib/test_hexdump.c b/lib/test_hexdump.c new file mode 100644 index 000000000000..5241df36eedf --- /dev/null +++ b/lib/test_hexdump.c @@ -0,0 +1,180 @@ +/* + * Test cases for lib/hexdump.c module. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/random.h> +#include <linux/string.h> + +static const unsigned char data_b[] = { + '\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2', /* 00 - 07 */ + '\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b', /* 08 - 0f */ + '\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9', /* 10 - 17 */ + '\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c', /* 18 - 1f */ +}; + +static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C..."; + +static const char * const test_data_1_le[] __initconst = { + "be", "32", "db", "7b", "0a", "18", "93", "b2", + "70", "ba", "c4", "24", "7d", "83", "34", "9b", + "a6", "9c", "31", "ad", "9c", "0f", "ac", "e9", + "4c", "d1", "19", "99", "43", "b1", "af", "0c", +}; + +static const char * const test_data_2_le[] __initconst = { + "32be", "7bdb", "180a", "b293", + "ba70", "24c4", "837d", "9b34", + "9ca6", "ad31", "0f9c", "e9ac", + "d14c", "9919", "b143", "0caf", +}; + +static const char * const test_data_4_le[] __initconst = { + "7bdb32be", "b293180a", "24c4ba70", "9b34837d", + "ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143", +}; + +static const char * const test_data_8_le[] __initconst = { + "b293180a7bdb32be", "9b34837d24c4ba70", + "e9ac0f9cad319ca6", "0cafb1439919d14c", +}; + +static void __init test_hexdump(size_t len, int rowsize, int groupsize, + bool ascii) +{ + char test[32 * 3 + 2 + 32 + 1]; + char real[32 * 3 + 2 + 32 + 1]; + char *p; + const char * const *result; + size_t l = len; + int gs = groupsize, rs = rowsize; + unsigned int i; + + hex_dump_to_buffer(data_b, l, rs, gs, real, sizeof(real), ascii); + + if (rs != 16 && rs != 32) + rs = 16; + + if (l > rs) + l = rs; + + if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0)) + gs = 1; + + if (gs == 8) + result = test_data_8_le; + else if (gs == 4) + result = test_data_4_le; + else if (gs == 2) + result = test_data_2_le; + else + result = test_data_1_le; + + memset(test, ' ', sizeof(test)); + + /* hex dump */ + p = test; + for (i = 0; i < l / gs; i++) { + const char *q = *result++; + size_t amount = strlen(q); + + strncpy(p, q, amount); + p += amount + 1; + } + if (i) + p--; + + /* ASCII part */ + if (ascii) { + p = test + rs * 2 + rs / gs + 1; + strncpy(p, data_a, l); + p += l; + } + + *p = '\0'; + + if (strcmp(test, real)) { + pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize); + pr_err("Result: '%s'\n", real); + pr_err("Expect: '%s'\n", test); + } +} + +static void __init test_hexdump_set(int rowsize, bool ascii) +{ + size_t d = min_t(size_t, sizeof(data_b), rowsize); + size_t len = get_random_int() % d + 1; + + test_hexdump(len, rowsize, 4, ascii); + test_hexdump(len, rowsize, 2, ascii); + test_hexdump(len, rowsize, 8, ascii); + test_hexdump(len, rowsize, 1, ascii); +} + +static void __init test_hexdump_overflow(bool ascii) +{ + char buf[56]; + const char *t = test_data_1_le[0]; + size_t l = get_random_int() % sizeof(buf); + bool a; + int e, r; + + memset(buf, ' ', sizeof(buf)); + + r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii); + + if (ascii) + e = 50; + else + e = 2; + buf[e + 2] = '\0'; + + if (!l) { + a = r == e && buf[0] == ' '; + } else if (l < 3) { + a = r == e && buf[0] == '\0'; + } else if (l < 4) { + a = r == e && !strcmp(buf, t); + } else if (ascii) { + if (l < 51) + a = r == e && buf[l - 1] == '\0' && buf[l - 2] == ' '; + else + a = r == e && buf[50] == '\0' && buf[49] == '.'; + } else { + a = r == e && buf[e] == '\0'; + } + + if (!a) { + pr_err("Len: %zu rc: %u strlen: %zu\n", l, r, strlen(buf)); + pr_err("Result: '%s'\n", buf); + } +} + +static int __init test_hexdump_init(void) +{ + unsigned int i; + int rowsize; + + pr_info("Running tests...\n"); + + rowsize = (get_random_int() % 2 + 1) * 16; + for (i = 0; i < 16; i++) + test_hexdump_set(rowsize, false); + + rowsize = (get_random_int() % 2 + 1) * 16; + for (i = 0; i < 16; i++) + test_hexdump_set(rowsize, true); + + for (i = 0; i < 16; i++) + test_hexdump_overflow(false); + + for (i = 0; i < 16; i++) + test_hexdump_overflow(true); + + return -EINVAL; +} +module_init(test_hexdump_init); +MODULE_LICENSE("Dual BSD/GPL"); |