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Diffstat (limited to 'toys')
-rw-r--r--toys/pending/file.c232
1 files changed, 97 insertions, 135 deletions
diff --git a/toys/pending/file.c b/toys/pending/file.c
index 1ebafdb0..2c2f2864 100644
--- a/toys/pending/file.c
+++ b/toys/pending/file.c
@@ -22,177 +22,143 @@ GLOBALS(
int max_name_len;
)
-// TODO: all the ELF magic numbers are available in <elf.h> --- use that?
-
-static char *elf_arch(int e_machine)
-{
- // TODO: include obsolete stuff we'll never see, like "PDP-10" and "VAX"?
- switch (e_machine) {
- case 3: return "Intel 80386";
- case 8: return "MIPS";
- case 40: return "ARM";
- case 62: return "x86-64";
- case 183: return "ARM aarch64";
- default: return NULL;
- }
-}
-
-static int64_t elf_int(int endian, char *data, int bytes)
-{
- if (endian == 1) return peek_le(data, bytes);
- return peek_be(data, bytes);
-}
-
static void do_elf_file()
{
- int elf_endian = toybuf[5];
- int e_type, e_machine;
-
- xprintf("ELF");
+ int elf_endian = toybuf[5], e_type, e_machine, i;
+ int64_t (*elf_int)(void *ptr, unsigned size) = peek_le;
+ // Values from include/linux/elf-em.h (plus arch/*/include/asm/elf.h)
+ // Names are linux/arch/ directory name
+ struct {int val; char *name;} type[] = {{0x9026, "alpha"},
+ {40, "arm"}, {183, "arm"}, {0x18ad, "avr32"}, {106, "blackfin"},
+ {76, "cris"}, {0x5441, "frv"}, {46, "h8300"}, {50, "ia64"},//ia intel ftaghn
+ {88, "m32r"}, {4, "m68k"}, {0xbaab, "microblaze"}, {8, "mips"},
+ {10, "mips"}, {89, "mn10300"}, {15, "parisc"}, {22, "s390"},
+ {135, "score"}, {42, "sh"}, {2, "sparc"}, {18, "sparc"}, {43, "sparc"},
+ {187, "tile"}, {188, "tile"}, {191, "tile"}, {3, "x86"}, {6, "x86"},
+ {62, "x86"}, {94, "xtensa"}, {0xabc7, "xtensa"}};
+
+ xprintf("ELF ");
// "64-bit"
- if (toybuf[4] == 1) xprintf(" 32-bit");
- else if (toybuf[4] == 2) xprintf(" 64-bit");
- else xprintf(" (invalid class %d)", toybuf[4]);
+ if (toybuf[4] == 1) xprintf("32-bit ");
+ else if (toybuf[4] == 2) xprintf("64-bit ");
+ else xprintf("(bad class %d)", toybuf[4]);
// "LSB"
- if (elf_endian == 1) xprintf(" LSB");
- else if (elf_endian == 2) xprintf(" MSB");
- else xprintf("(invalid endian %d) ", elf_endian);
-
- if (elf_endian == 1 || elf_endian == 2) {
- char *arch;
-
- // ", executable"
- e_type = elf_int(elf_endian, &toybuf[0x10], 2);
- if (e_type == 1) xprintf(" relocatable");
- else if (e_type == 2) xprintf(" executable");
- else if (e_type == 3) xprintf(" shared object");
- else if (e_type == 4) xprintf(" core dump");
- else xprintf(" (invalid type %d)", e_type);
-
- // ", x86-64"
- e_machine = elf_int(elf_endian, &toybuf[0x12], 2);
- arch = elf_arch(e_machine);
- if (arch) xprintf(", %s", arch);
- else xprintf(", (unknown arch %d)", e_machine);
+ if (elf_endian == 1) xprintf("LSB ");
+ else if (elf_endian == 2) {
+ xprintf("MSB ");
+ elf_int = peek_be;
+ } else {
+ xprintf("(bad endian %d)\n", elf_endian);
+
+ // At this point we can't parse remaining fields.
+ return;
}
+ // ", executable"
+ e_type = elf_int(&toybuf[0x10], 2);
+ if (e_type == 1) xprintf("relocatable");
+ else if (e_type == 2) xprintf("executable");
+ else if (e_type == 3) xprintf("shared object");
+ else if (e_type == 4) xprintf("core dump");
+ else xprintf("(invalid type %d)", e_type);
+
+ // ", x86-64"
+ e_machine = elf_int(&toybuf[0x12], 2);
+ for (i = 0; i<ARRAY_LEN(type); i++) if (e_machine == type[i].val) break;
+ if (i<ARRAY_LEN(type)) xprintf(", %s", type[i].name);
+ else xprintf(", (unknown arch %d)", e_machine);
+
// "version 1"
xprintf(", version %d", toybuf[6]);
// " (SYSV)"
// TODO: will we ever meet any of the others in practice?
- if (toybuf[7] == 0) xprintf(" (SYSV)");
+ if (!toybuf[7]) xprintf(" (SYSV)");
else xprintf(" (OS %d)", toybuf[7]);
// TODO: we'd need to actually parse the ELF file to report the rest...
// ", dynamically linked"
// " (uses shared libs)"
- // ", for GNU/Linux 2.6.24"
+ // ", for Linux 2.6.24"
// ", BuildID[sha1]=SHA"
// ", stripped"
- xputs("");
+ xputc('\n');
}
-// https://www.w3.org/TR/PNG/#6Colour-values
-static char *png_color_type(int color_type)
+static void do_regular_file(int fd, char *name)
{
- switch (color_type) {
- case 0: return "grayscale";
- case 2: return "color RGB";
- case 3: return "indexed color";
- case 4: return "grayscale with alpha";
- case 6: return "color RGBA";
- default: return "unknown";
- }
-}
+ char *s;
+ int len = read(fd, s = toybuf, sizeof(toybuf)-256);
-static void do_png_file()
-{
- // PNG is big-endian: https://www.w3.org/TR/PNG/#7Integers-and-byte-order
- int chunk_length = peek_be(&toybuf[8], 4);
-
- xprintf("PNG image data");
-
- // The IHDR chunk comes first.
- // https://www.w3.org/TR/PNG/#11IHDR
- if (chunk_length == 13 && memcmp(&toybuf[12], "IHDR", 4) == 0) {
- int width = peek_be(&toybuf[16], 4);
- int height = peek_be(&toybuf[20], 4);
- int bits = toybuf[24] & 0xff;
- int type = toybuf[25] & 0xff;
- int interlaced = toybuf[28] & 0xff;
-
- xprintf(", %d x %d, %d-bit/%s, %s", width, height, bits,
- png_color_type(type),
- interlaced ? "interlaced" : "non-interlaced");
- }
+ if (len<0) perror_msg("%s", name);
- xputs("");
-}
+ if (len>20 && strstart(&s, "\177ELF")) {
+ do_elf_file(len);
+ } else if (len>28 && strstart(&s, "\x89PNG\x0d\x0a\x1a\x0a")) {
+ // PNG is big-endian: https://www.w3.org/TR/PNG/#7Integers-and-byte-order
+ int chunk_length = peek_be(s, 4);
-static void do_gif_file()
-{
- // https://www.w3.org/Graphics/GIF/spec-gif89a.txt
- int width = peek_le(&toybuf[6], 2);
- int height = peek_le(&toybuf[8], 2);
+ xprintf("PNG image data");
- xprintf("GIF image data, %d x %d\n", width, height);
-}
+ // The IHDR chunk comes first: https://www.w3.org/TR/PNG/#11IHDR
+ s += 4;
+ if (chunk_length == 13 && strstart(&s, "IHDR")) {
+ // https://www.w3.org/TR/PNG/#6Colour-values
+ char *c = 0, *colors[] = {"grayscale", 0, "color RGB", "indexed color",
+ "grayscale with alpha", 0, "color RGBA"};
-static void do_jpeg_file()
-{
- // TODO: parsing JPEG for width/height is harder than GIF or PNG.
- xprintf("JPEG image data\n");
-}
+ if (s[9]<ARRAY_LEN(colors)) c = colors[s[9]];
+ if (!c) c = "unknown";
-static void do_java_class_file()
-{
- // https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html
- int minor = peek_be(&toybuf[4], 2);
- int major = peek_be(&toybuf[6], 2);
+ xprintf(", %d x %d, %d-bit/%s, %sinterlaced", (int)peek_be(s, 4),
+ (int)peek_be(s+4, 4), s[8], c, s[12] ? "" : "non-");
+ }
- xprintf("Java class file, version %d.%d\n", major, minor);
-}
+ xputc('\n');
-static void do_regular_file(int fd, char *name)
-{
- int len = read(fd, toybuf, sizeof(toybuf));
+ // https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ } else if (len>16 && (strstart(&s, "GIF87a") || strstart(&s, "GIF89a")))
+ xprintf("GIF image data, %d x %d\n",
+ (int)peek_le(s, 2), (int)peek_le(s+8, 2));
- if (len<0) perror_msg("cannot open");
+ // TODO: parsing JPEG for width/height is harder than GIF or PNG.
+ else if (len>32 && memcmp(toybuf, "\xff\xd8", 2) == 0)
+ xprintf("JPEG image data\n");
- if (len>20 && memcmp(toybuf, "\177ELF", 4) == 0) {
- do_elf_file(len);
- } else if (len>28 && memcmp(toybuf, "\x89PNG\x0d\x0a\x1a\x0a", 8) == 0) {
- do_png_file();
- } else if (len>16 && (memcmp(toybuf, "GIF87a", 6) == 0 ||
- memcmp(toybuf, "GIF89a", 6) == 0)) {
- do_gif_file();
- } else if (len>32 && memcmp(toybuf, "\xff\xd8", 2) == 0) {
- do_jpeg_file();
- } else if (len>8 && memcmp(toybuf, "\xca\xfe\xba\xbe", 4) == 0) {
- do_java_class_file();
+ // https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html
+ else if (len>8 && strstart(&s, "\xca\xfe\xba\xbe"))
+ xprintf("Java class file, version %d.%d\n",
+ (int)peek_be(s+6, 2), (int)peek_be(s, 2));
// TODO: cpio archive.
// TODO: tar archive.
// TODO: zip/jar/apk archive.
- } else {
- char *what = "ASCII text";
- int i;
+ else {
+ char *what = 0;
+ int i, bytes;
- // TODO: report which interpreter?
- if (strncmp(toybuf, "#!", 2) == 0) what = "commands text";
+ // If shell script, report which interpreter
+ if (len>3 && strstart(&s, "#!")) {
+ for (what = s; (s-toybuf)<len && !isspace(*s); s++);
+ strcpy(s, " script");
- // TODO: try UTF-8 too before falling back to "data".
- for (i = 0; i < len; ++i) {
+ // Distinguish ASCII text, UTF-8 text, or data
+ } else for (i = 0; i<len; ++i) {
if (!(isprint(toybuf[i]) || isspace(toybuf[i]))) {
- what = "data";
- break;
+ wchar_t wc;
+ if ((bytes = mbrtowc(&wc, s+i, len-i, 0))>0 && wcwidth(wc)>=0) {
+ i += bytes-1;
+ if (!what) what = "UTF-8 text";
+ } else {
+ what = "data";
+ break;
+ }
}
}
- xputs(what);
+ xputs(what ? what : "ASCII text");
}
}
@@ -219,19 +185,15 @@ static void do_file(int fd, char *name)
xputs(what);
}
-static void init_max_name_len()
+void file_main(void)
{
char **name;
- int name_len;
for (name = toys.optargs; *name; ++name) {
- name_len = strlen(*name);
+ int name_len = strlen(*name);
+
if (name_len > TT.max_name_len) TT.max_name_len = name_len;
}
-}
-void file_main(void)
-{
- init_max_name_len();
loopfiles(toys.optargs, do_file);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 16:55:04 +0000