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Minor optimization of base64 decode.

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Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger
2012-01-20 22:02:32 +01:00
parent 2d9e2c6464
commit 686ba5f4ea
1 changed files with 5 additions and 3 deletions
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8
libavutil/base64.c
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@@ -26,6 +26,7 @@
#include "common.h" #include "common.h"
#include "base64.h" #include "base64.h"
#include "avassert.h"
/* ---------------- private code */ /* ---------------- private code */
static const uint8_t map2[] = static const uint8_t map2[] =
@@ -48,10 +49,10 @@ int av_base64_decode(uint8_t *out, const char *in, int out_size)
uint8_t *dst = out; uint8_t *dst = out;
v = 0; v = 0;
for (i = 0; in[i] && in[i] != '='; i++) { for (i = 0; ; i++) {
unsigned int index= in[i]-43; unsigned int index= in[i]-43;
if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff) if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
return -1; return in[i] && in[i] != '=' ? -1 : dst - out;
v = (v << 6) + map2[index]; v = (v << 6) + map2[index];
if (i & 3) { if (i & 3) {
if (dst - out < out_size) { if (dst - out < out_size) {
@@ -60,7 +61,8 @@ int av_base64_decode(uint8_t *out, const char *in, int out_size)
} }
} }
return dst - out; av_assert1(0);
return 0;
} }
/***************************************************************************** /*****************************************************************************