libbb: split decode_base64 off read_base64
function old new delta decode_base64 - 182 +182 read_base64 378 255 -123 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/1 up/down: 182/-123) Total: 59 bytes Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Leonid Lisovskiy
Denys Vlasenko
parent
ec447c7f01
commit
328f27fe44
@ -1591,7 +1591,8 @@ enum {
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/* Sign-extends to a value which never matches fgetc result: */
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BASE64_FLAG_NO_STOP_CHAR = 0x80,
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};
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void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags);
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const char *decode_base64(char **pp_dst, const char *src) FAST_FUNC;
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void read_base64(FILE *src_stream, FILE *dst_stream, int flags) FAST_FUNC;
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typedef struct md5_ctx_t {
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uint8_t wbuffer[64]; /* always correctly aligned for uint64_t */
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125
libbb/uuencode.c
125
libbb/uuencode.c
@ -73,23 +73,23 @@ void FAST_FUNC bb_uuencode(char *p, const void *src, int length, const char *tbl
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}
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/*
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* Decode base64 encoded stream.
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* Can stop on EOF, specified char, or on uuencode-style "====" line:
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* flags argument controls it.
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* Decode base64 encoded string. Stops on '\0'.
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*
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* Returns: pointer to the undecoded part of source.
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* If points to '\0', then the source was fully decoded.
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* (*dst): advanced past the last written byte.
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*/
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void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags)
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const char* FAST_FUNC decode_base64(char **pp_dst, const char *src)
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{
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/* Note that EOF _can_ be passed as exit_char too */
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#define exit_char ((int)(signed char)flags)
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#define uu_style_end (flags & BASE64_FLAG_UU_STOP)
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int term_count = 0;
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char *dst = *pp_dst;
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const char *src_tail;
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while (1) {
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unsigned char translated[4];
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int count = 0;
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/* Process one group of 4 chars */
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src_tail = src;
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while (count < 4) {
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char *table_ptr;
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int ch;
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@ -101,11 +101,20 @@ void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags)
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* "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"
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*/
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do {
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ch = fgetc(src_stream);
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if (ch == exit_char && count == 0)
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return;
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if (ch == EOF)
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bb_error_msg_and_die("truncated base64 input");
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ch = *src;
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if (ch == '\0') {
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if (count == 0) {
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/* Example:
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* If we decode "QUJD <NUL>", we want
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* to return ptr to NUL, not to ' ',
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* because we did fully decode
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* the string (to "ABC").
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*/
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src_tail = src;
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}
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goto ret;
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}
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src++;
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table_ptr = strchr(bb_uuenc_tbl_base64, ch);
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//TODO: add BASE64_FLAG_foo to die on bad char?
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//Note that then we may need to still allow '\r' (for mail processing)
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@ -114,21 +123,15 @@ void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags)
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/* Convert encoded character to decimal */
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ch = table_ptr - bb_uuenc_tbl_base64;
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if (ch == 65 /* '\n' */) {
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/* Terminating "====" line? */
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if (uu_style_end && term_count == 4)
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return; /* yes */
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term_count = 0;
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if (ch == 65) { /* '\n' */
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continue;
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}
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/* ch is 64 if char was '=', otherwise 0..63 */
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translated[count] = ch & 63; /* 64 -> 0 */
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if (ch == 64) {
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term_count++;
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if (ch == 64) { /* '=' */
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break;
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}
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count++;
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term_count = 0;
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}
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/* Merge 6 bit chars to 8 bit.
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@ -136,10 +139,82 @@ void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags)
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* "eQ==" -> "y", not "y NUL NUL"
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*/
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if (count > 1)
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fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
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*dst++ = translated[0] << 2 | translated[1] >> 4;
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if (count > 2)
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fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
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*dst++ = translated[1] << 4 | translated[2] >> 2;
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if (count > 3)
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fputc(translated[2] << 6 | translated[3], dst_stream);
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*dst++ = translated[2] << 6 | translated[3];
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} /* while (1) */
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ret:
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*pp_dst = dst;
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return src_tail;
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}
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/*
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* Decode base64 encoded stream.
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* Can stop on EOF, specified char, or on uuencode-style "====" line:
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* flags argument controls it.
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*/
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void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags)
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{
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/* Note that EOF _can_ be passed as exit_char too */
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#define exit_char ((int)(signed char)flags)
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#define uu_style_end (flags & BASE64_FLAG_UU_STOP)
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/* uuencoded files have 61 byte lines. Use 64 byte buffer
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* to process line at a time.
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*/
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enum { BUFFER_SIZE = 64 };
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char in_buf[BUFFER_SIZE + 2];
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char out_buf[BUFFER_SIZE / 4 * 3 + 2];
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char *out_tail;
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const char *in_tail;
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int term_seen = 0;
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int in_count = 0;
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while (1) {
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while (in_count < BUFFER_SIZE) {
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int ch = fgetc(src_stream);
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if (ch == exit_char) {
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if (in_count == 0)
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return;
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term_seen = 1;
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break;
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}
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if (ch == EOF) {
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term_seen = 1;
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break;
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}
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/* Prevent "====" line to be split: stop if we see '\n'.
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* We can also skip other whitespace and skirt the problem
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* of files with NULs by stopping on any control char or space:
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*/
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if (ch <= ' ')
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break;
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in_buf[in_count++] = ch;
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}
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in_buf[in_count] = '\0';
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/* Did we encounter "====" line? */
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if (uu_style_end && strcmp(in_buf, "====") == 0)
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return;
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out_tail = out_buf;
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in_tail = decode_base64(&out_tail, in_buf);
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fwrite(out_buf, (out_tail - out_buf), 1, dst_stream);
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if (term_seen) {
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/* Did we consume ALL characters? */
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if (*in_tail == '\0')
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return;
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/* No */
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bb_error_msg_and_die("truncated base64 input");
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}
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/* It was partial decode */
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in_count = strlen(in_tail);
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memmove(in_buf, in_tail, in_count);
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}
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}
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@ -8,7 +8,7 @@
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. ./testing.sh
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# testing "test name" "options" "expected result" "file input" "stdin"
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# testing "test name" "command(s)" "expected result" "file input" "stdin"
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# file input will be file called "input"
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# test can create a file "actual" instead of writing to stdout
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@ -24,4 +24,99 @@ testing "uuencode correct encoding" "uuencode bb_uuenc_test.out" \
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testing "uuencode correct base64 encoding" "uuencode -m bb_uuenc_test.out" \
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"begin-base64 644 bb_uuenc_test.out\nVGhlIGZhc3QgZ3JleSBmb3gganVtcGVkIG92ZXIgdGhlIGxhenkgYnJvd24g\nZG9nLgo=\n====\n" \
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"" "The fast grey fox jumped over the lazy brown dog.\n"
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testing "uuencode empty file" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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`
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end
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' "" ""
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testing "uuencode -m empty file" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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====
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' "" ""
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testing "uuencode file 'A'" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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!00``
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`
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end
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A' "" "A"
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testing "uuencode -m file 'A'" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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QQ==
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====
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A' "" "A"
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testing "uuencode file 'AB'" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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"04(`
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`
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end
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AB' "" "AB"
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testing "uuencode -m file 'AB'" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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QUI=
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====
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AB' "" "AB"
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testing "uuencode file 'ABC'" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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#04)#
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`
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end
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ABC' "" "ABC"
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testing "uuencode -m file 'ABC'" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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QUJD
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====
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ABC' "" "ABC"
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testing "uuencode file 'ABCD'" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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$04)#1```
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`
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end
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ABCD' "" "ABCD"
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testing "uuencode -m file 'ABCD'" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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QUJDRA==
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====
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ABCD' "" "ABCD"
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testing "uuencode file 'ABCDE'" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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%04)#1$4`
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`
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end
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ABCDE' "" "ABCDE"
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testing "uuencode -m file 'ABCDE'" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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QUJDREU=
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====
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ABCDE' "" "ABCDE"
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testing "uuencode file 'ABCDEF'" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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&04)#1$5&
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`
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end
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ABCDEF' "" "ABCDEF"
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testing "uuencode -m file 'ABCDEF'" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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QUJDREVG
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====
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ABCDEF' "" "ABCDEF"
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testing "uuencode file 'A<NUL><0xff>Z'" 'r=`uuencode FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin 644 FILE
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$00#_6@``
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`
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end
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A\x0\xffZ' "" "A\x0\xffZ"
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testing "uuencode -m file 'A<NUL><0xff>Z'" 'r=`uuencode -m FILE`; echo "$r"; echo "$r" | uudecode -o -;' \
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'begin-base64 644 FILE
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QQD/Wg==
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====
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A\x0\xffZ' "" "A\x0\xffZ"
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exit $FAILCOUNT
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