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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
| commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
| tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /other-licenses/7zstub/src/C/Delta.c | |
| parent | Initial commit. (diff) | |
| download | firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip | |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'other-licenses/7zstub/src/C/Delta.c')
| -rw-r--r-- | other-licenses/7zstub/src/C/Delta.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/C/Delta.c b/other-licenses/7zstub/src/C/Delta.c new file mode 100644 index 0000000000..6cbbe46012 --- /dev/null +++ b/other-licenses/7zstub/src/C/Delta.c @@ -0,0 +1,64 @@ +/* Delta.c -- Delta converter
+2009-05-26 : Igor Pavlov : Public domain */
+
+#include "Precomp.h"
+
+#include "Delta.h"
+
+void Delta_Init(Byte *state)
+{
+ unsigned i;
+ for (i = 0; i < DELTA_STATE_SIZE; i++)
+ state[i] = 0;
+}
+
+static void MyMemCpy(Byte *dest, const Byte *src, unsigned size)
+{
+ unsigned i;
+ for (i = 0; i < size; i++)
+ dest[i] = src[i];
+}
+
+void Delta_Encode(Byte *state, unsigned delta, Byte *data, SizeT size)
+{
+ Byte buf[DELTA_STATE_SIZE];
+ unsigned j = 0;
+ MyMemCpy(buf, state, delta);
+ {
+ SizeT i;
+ for (i = 0; i < size;)
+ {
+ for (j = 0; j < delta && i < size; i++, j++)
+ {
+ Byte b = data[i];
+ data[i] = (Byte)(b - buf[j]);
+ buf[j] = b;
+ }
+ }
+ }
+ if (j == delta)
+ j = 0;
+ MyMemCpy(state, buf + j, delta - j);
+ MyMemCpy(state + delta - j, buf, j);
+}
+
+void Delta_Decode(Byte *state, unsigned delta, Byte *data, SizeT size)
+{
+ Byte buf[DELTA_STATE_SIZE];
+ unsigned j = 0;
+ MyMemCpy(buf, state, delta);
+ {
+ SizeT i;
+ for (i = 0; i < size;)
+ {
+ for (j = 0; j < delta && i < size; i++, j++)
+ {
+ buf[j] = data[i] = (Byte)(buf[j] + data[i]);
+ }
+ }
+ }
+ if (j == delta)
+ j = 0;
+ MyMemCpy(state, buf + j, delta - j);
+ MyMemCpy(state + delta - j, buf, j);
+}
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