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Code Issues Releases Activity

Avoid some code duplication in xan_unpack

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Originally committed as revision 18586 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-04-17 18:54:17 +00:00
parent f371abe4a8
commit 948f60fa24
1 changed files with 13 additions and 15 deletions
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28
libavcodec/xan.c
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@ -135,16 +135,16 @@ static void xan_unpack(unsigned char *dest, const unsigned char *src, int dest_l
while (dest < dest_end) {
opcode = *src++;
if (opcode < 0xe0) {
int size2, back;
if ( (opcode & 0x80) == 0 ) {
offset = *src++;
size = opcode & 3;
memcpy(dest, src, size); dest += size; src += size;
size = ((opcode & 0x1c) >> 2) + 3;
av_memcpy_backptr(dest, ((opcode & 0x60) << 3) + offset + 1, size);
dest += size;
size2 = ((opcode & 0x1c) >> 2) + 3;
back = ((opcode & 0x60) << 3) + offset + 1;
} else if ( (opcode & 0x40) == 0 ) {
@ -152,28 +152,26 @@ static void xan_unpack(unsigned char *dest, const unsigned char *src, int dest_l
byte2 = *src++;
size = byte1 >> 6;
memcpy(dest, src, size); dest += size; src += size;
size = (opcode & 0x3f) + 4;
av_memcpy_backptr(dest, ((byte1 & 0x3f) << 8) + byte2 + 1, size);
dest += size;
size2 = (opcode & 0x3f) + 4;
back = ((byte1 & 0x3f) << 8) + byte2 + 1;
} else if ( (opcode & 0x20) == 0 ) {
} else {
byte1 = *src++;
byte2 = *src++;
byte3 = *src++;
size = opcode & 3;
memcpy(dest, src, size); dest += size; src += size;
size = byte3 + 5 + ((opcode & 0xc) << 6);
size2 = byte3 + 5 + ((opcode & 0xc) << 6);
back = ((opcode & 0x10) << 12) + 1 + (byte1 << 8) + byte2;
if (dest >= dest_end || size > dest_end - dest)
return;
av_memcpy_backptr(dest,
((opcode & 0x10) << 12) + 1 + (byte1 << 8) + byte2,
size);
dest += size;
}
memcpy(dest, src, size); dest += size; src += size;
av_memcpy_backptr(dest, back, size2);
dest += size2;
} else {
size = ((opcode & 0x1f) << 2) + 4;