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-rw-r--r--libavutil/base64.c171
1 files changed, 143 insertions, 28 deletions
diff --git a/libavutil/base64.c b/libavutil/base64.c
index d16195f1b9..87e2dfd981 100644
--- a/libavutil/base64.c
+++ b/libavutil/base64.c
@@ -1,20 +1,20 @@
/*
* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -26,41 +26,106 @@
#include "common.h"
#include "base64.h"
+#include "intreadwrite.h"
/* ---------------- private code */
-static const uint8_t map2[] =
+static const uint8_t map2[256] =
{
+ 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff,
+
0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
+ 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01,
0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
- 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
+ 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,
+
+ 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
-int av_base64_decode(uint8_t *out, const char *in, int out_size)
+#define BASE64_DEC_STEP(i) do { \
+ bits = map2[in[i]]; \
+ if (bits & 0x80) \
+ goto out ## i; \
+ v = i ? (v << 6) + bits : bits; \
+} while(0)
+
+int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
{
- int i;
- unsigned v = 0;
uint8_t *dst = out;
+ uint8_t *end = out + out_size;
+ // no sign extension
+ const uint8_t *in = in_str;
+ unsigned bits = 0xff;
+ unsigned v;
- for (i = 0; in[i] && in[i] != '='; i++) {
- unsigned int index= in[i]-43;
- if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
- return -1;
- v = (v << 6) + map2[index];
- if (i & 3) {
- if (dst - out < out_size) {
- *dst++ = v >> (6 - 2 * (i & 3));
- }
- }
+ while (end - dst > 3) {
+ BASE64_DEC_STEP(0);
+ BASE64_DEC_STEP(1);
+ BASE64_DEC_STEP(2);
+ BASE64_DEC_STEP(3);
+ // Using AV_WB32 directly confuses compiler
+ v = av_be2ne32(v << 8);
+ AV_WN32(dst, v);
+ dst += 3;
+ in += 4;
+ }
+ if (end - dst) {
+ BASE64_DEC_STEP(0);
+ BASE64_DEC_STEP(1);
+ BASE64_DEC_STEP(2);
+ BASE64_DEC_STEP(3);
+ *dst++ = v >> 16;
+ if (end - dst)
+ *dst++ = v >> 8;
+ if (end - dst)
+ *dst++ = v;
+ in += 4;
+ }
+ while (1) {
+ BASE64_DEC_STEP(0);
+ in++;
+ BASE64_DEC_STEP(0);
+ in++;
+ BASE64_DEC_STEP(0);
+ in++;
+ BASE64_DEC_STEP(0);
+ in++;
}
- return dst - out;
+out3:
+ *dst++ = v >> 10;
+ v <<= 2;
+out2:
+ *dst++ = v >> 4;
+out1:
+out0:
+ return bits & 1 ? AVERROR_INVALIDDATA : dst - out;
}
/*****************************************************************************
@@ -82,15 +147,23 @@ char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
out_size < AV_BASE64_SIZE(in_size))
return NULL;
ret = dst = out;
+ while (bytes_remaining > 3) {
+ i_bits = AV_RB32(in);
+ in += 3; bytes_remaining -= 3;
+ *dst++ = b64[ i_bits>>26 ];
+ *dst++ = b64[(i_bits>>20) & 0x3F];
+ *dst++ = b64[(i_bits>>14) & 0x3F];
+ *dst++ = b64[(i_bits>>8 ) & 0x3F];
+ }
+ i_bits = 0;
while (bytes_remaining) {
i_bits = (i_bits << 8) + *in++;
bytes_remaining--;
i_shift += 8;
-
- do {
- *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
- i_shift -= 6;
- } while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
+ }
+ while (i_shift > 0) {
+ *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
+ i_shift -= 6;
}
while ((dst - ret) & 3)
*dst++ = '=';
@@ -100,6 +173,7 @@ char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
}
#ifdef TEST
+// LCOV_EXCL_START
#define MAX_DATA_SIZE 1024
#define MAX_ENCODED_SIZE 2048
@@ -121,21 +195,40 @@ static int test_encode_decode(const uint8_t *data, unsigned int data_size,
return 1;
}
- if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) < 0) {
+ if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) != data_size) {
printf("Failed: cannot decode the encoded string\n"
"Encoded:\n%s\n", encoded);
return 1;
}
+ if ((data2_size = av_base64_decode(data2, encoded, data_size)) != data_size) {
+ printf("Failed: cannot decode with minimal buffer\n"
+ "Encoded:\n%s\n", encoded);
+ return 1;
+ }
if (memcmp(data2, data, data_size)) {
printf("Failed: encoded/decoded data differs from original data\n");
return 1;
}
+ if (av_base64_decode(NULL, encoded, 0) != 0) {
+ printf("Failed: decode to NULL buffer\n");
+ return 1;
+ }
+ if (strlen(encoded)) {
+ char *end = strchr(encoded, '=');
+ if (!end)
+ end = encoded + strlen(encoded) - 1;
+ *end = '%';
+ if (av_base64_decode(NULL, encoded, 0) >= 0) {
+ printf("Failed: error detection\n");
+ return 1;
+ }
+ }
printf("Passed!\n");
return 0;
}
-int main(void)
+int main(int argc, char ** argv)
{
int i, error_count = 0;
struct test {
@@ -151,12 +244,34 @@ int main(void)
{ "666666", "NjY2NjY2"},
{ "abc:def", "YWJjOmRlZg=="},
};
+ char in[1024], out[2048];
printf("Encoding/decoding tests\n");
for (i = 0; i < FF_ARRAY_ELEMS(tests); i++)
error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref);
+ if (argc>1 && !strcmp(argv[1], "-t")) {
+ memset(in, 123, sizeof(in));
+ for(i=0; i<10000; i++){
+ START_TIMER
+ av_base64_encode(out, sizeof(out), in, sizeof(in));
+ STOP_TIMER("encode")
+ }
+ for(i=0; i<10000; i++){
+ START_TIMER
+ av_base64_decode(in, out, sizeof(in));
+ STOP_TIMER("decode")
+ }
+
+ for(i=0; i<10000; i++){
+ START_TIMER
+ av_base64_decode(NULL, out, 0);
+ STOP_TIMER("syntax check")
+ }
+ }
+
return error_count;
}
+// LCOV_EXCL_STOP
#endif
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