#include "common.h"
#include "base64.h"
-#include "avassert.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, v;
uint8_t *dst = out;
uint8_t *end = out + out_size;
+ // no sign extension
+ const uint8_t *in = in_str;
+ unsigned bits = 0xff;
+ unsigned v;
- v = 0;
- for (i = 0; ; i++) {
- unsigned int index= in[i]-43;
- if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
- return in[i] && in[i] != '=' ? -1 : dst - out;
- v = (v << 6) + map2[index];
- if (i & 3) {
- if (dst < end) {
- *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++;
}
- av_assert1(0);
- return 0;
+out3:
+ *dst++ = v >> 10;
+ v <<= 2;
+out2:
+ *dst++ = v >> 4;
+out1:
+out0:
+ return bits & 1 ? -1 : dst - out;
}
/*****************************************************************************
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;