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-rwxr-xr-xC/Xz.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/C/Xz.c b/C/Xz.c
new file mode 100755
index 0000000..0bdf047
--- /dev/null
+++ b/C/Xz.c
@@ -0,0 +1,88 @@
+/* Xz.c - Xz
+2009-04-15 : Igor Pavlov : Public domain */
+
+#include "7zCrc.h"
+#include "CpuArch.h"
+#include "Xz.h"
+#include "XzCrc64.h"
+
+Byte XZ_SIG[XZ_SIG_SIZE] = { 0xFD, '7', 'z', 'X', 'Z', 0 };
+Byte XZ_FOOTER_SIG[XZ_FOOTER_SIG_SIZE] = { 'Y', 'Z' };
+
+unsigned Xz_WriteVarInt(Byte *buf, UInt64 v)
+{
+ unsigned i = 0;
+ do
+ {
+ buf[i++] = (Byte)((v & 0x7F) | 0x80);
+ v >>= 7;
+ }
+ while (v != 0);
+ buf[i - 1] &= 0x7F;
+ return i;
+}
+
+void Xz_Construct(CXzStream *p)
+{
+ p->numBlocks = p->numBlocksAllocated = 0;
+ p->blocks = 0;
+ p->flags = 0;
+}
+
+void Xz_Free(CXzStream *p, ISzAlloc *alloc)
+{
+ alloc->Free(alloc, p->blocks);
+ p->numBlocks = p->numBlocksAllocated = 0;
+ p->blocks = 0;
+}
+
+unsigned XzFlags_GetCheckSize(CXzStreamFlags f)
+{
+ int t = XzFlags_GetCheckType(f);
+ return (t == 0) ? 0 : (4 << ((t - 1) / 3));
+}
+
+void XzCheck_Init(CXzCheck *p, int mode)
+{
+ p->mode = mode;
+ switch (mode)
+ {
+ case XZ_CHECK_CRC32: p->crc = CRC_INIT_VAL; break;
+ case XZ_CHECK_CRC64: p->crc64 = CRC64_INIT_VAL; break;
+ case XZ_CHECK_SHA256: Sha256_Init(&p->sha); break;
+ }
+}
+
+void XzCheck_Update(CXzCheck *p, const void *data, size_t size)
+{
+ switch (p->mode)
+ {
+ case XZ_CHECK_CRC32: p->crc = CrcUpdate(p->crc, data, size); break;
+ case XZ_CHECK_CRC64: p->crc64 = Crc64Update(p->crc64, data, size); break;
+ case XZ_CHECK_SHA256: Sha256_Update(&p->sha, (const Byte *)data, size); break;
+ }
+}
+
+int XzCheck_Final(CXzCheck *p, Byte *digest)
+{
+ switch (p->mode)
+ {
+ case XZ_CHECK_CRC32:
+ SetUi32(digest, CRC_GET_DIGEST(p->crc));
+ break;
+ case XZ_CHECK_CRC64:
+ {
+ int i;
+ UInt64 v = CRC64_GET_DIGEST(p->crc64);
+ for (i = 0; i < 8; i++, v >>= 8)
+ digest[i] = (Byte)(v & 0xFF);
+ break;
+ }
+ case XZ_CHECK_SHA256:
+ Sha256_Final(&p->sha, digest);
+ break;
+ default:
+ return 0;
+ }
+ return 1;
+}