1 files changed, 311 insertions, 0 deletions
diff --git a/lib/lz4file.c b/lib/lz4file.c
new file mode 100644
index 0000000..eaf9b17
--- /dev/null
+++ b/lib/lz4file.c
@@ -0,0 +1,311 @@
+/*
+ * LZ4 file library
+ * Copyright (C) 2022, Xiaomi Inc.
+ *
+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following disclaimer
+ *   in the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You can contact the author at :
+ * - LZ4 homepage : http://www.lz4.org
+ * - LZ4 source repository : https://github.com/lz4/lz4
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "lz4.h"
+#include "lz4file.h"
+
+struct LZ4_readFile_s {
+  LZ4F_dctx* dctxPtr;
+  FILE* fp;
+  LZ4_byte* srcBuf;
+  size_t srcBufNext;
+  size_t srcBufSize;
+  size_t srcBufMaxSize;
+};
+
+struct LZ4_writeFile_s {
+  LZ4F_cctx* cctxPtr;
+  FILE* fp;
+  LZ4_byte* dstBuf;
+  size_t maxWriteSize;
+  size_t dstBufMaxSize;
+  LZ4F_errorCode_t errCode;
+};
+
+LZ4F_errorCode_t LZ4F_readOpen(LZ4_readFile_t** lz4fRead, FILE* fp)
+{
+  char buf[LZ4F_HEADER_SIZE_MAX];
+  size_t consumedSize;
+  LZ4F_errorCode_t ret;
+  LZ4F_frameInfo_t info;
+
+  if (fp == NULL || lz4fRead == NULL) {
+    return -LZ4F_ERROR_GENERIC;
+  }
+
+  *lz4fRead = (LZ4_readFile_t*)calloc(1, sizeof(LZ4_readFile_t));
+  if (*lz4fRead == NULL) {
+    return -LZ4F_ERROR_allocation_failed;
+  }
+
+  ret = LZ4F_createDecompressionContext(&(*lz4fRead)->dctxPtr, LZ4F_getVersion());
+  if (LZ4F_isError(ret)) {
+    free(*lz4fRead);
+    return ret;
+  }
+
+  (*lz4fRead)->fp = fp;
+  consumedSize = fread(buf, 1, sizeof(buf), (*lz4fRead)->fp);
+  if (consumedSize != sizeof(buf)) {
+    free(*lz4fRead);
+    return -LZ4F_ERROR_GENERIC;
+  }
+
+  ret = LZ4F_getFrameInfo((*lz4fRead)->dctxPtr, &info, buf, &consumedSize);
+  if (LZ4F_isError(ret)) {
+      LZ4F_freeDecompressionContext((*lz4fRead)->dctxPtr);
+      free(*lz4fRead);
+      return ret;
+    }
+
+  switch (info.blockSizeID) {
+    case LZ4F_default :
+    case LZ4F_max64KB :
+      (*lz4fRead)->srcBufMaxSize = 64 * 1024;
+      break;
+    case LZ4F_max256KB:
+      (*lz4fRead)->srcBufMaxSize = 256 * 1024;
+      break;
+    case LZ4F_max1MB:
+      (*lz4fRead)->srcBufMaxSize = 1 * 1024 * 1024;
+      break;
+    case LZ4F_max4MB:
+      (*lz4fRead)->srcBufMaxSize = 4 * 1024 * 1024;
+      break;
+    default:
+      LZ4F_freeDecompressionContext((*lz4fRead)->dctxPtr);
+      free(*lz4fRead);
+      return -LZ4F_ERROR_maxBlockSize_invalid;
+  }
+
+  (*lz4fRead)->srcBuf = (LZ4_byte*)malloc((*lz4fRead)->srcBufMaxSize);
+  if ((*lz4fRead)->srcBuf == NULL) {
+    LZ4F_freeDecompressionContext((*lz4fRead)->dctxPtr);
+    free(lz4fRead);
+    return -LZ4F_ERROR_allocation_failed;
+  }
+
+  (*lz4fRead)->srcBufSize = sizeof(buf) - consumedSize;
+  memcpy((*lz4fRead)->srcBuf, buf + consumedSize, (*lz4fRead)->srcBufSize);
+
+  return ret;
+}
+
+size_t LZ4F_read(LZ4_readFile_t* lz4fRead, void* buf, size_t size)
+{
+  LZ4_byte* p = (LZ4_byte*)buf;
+  size_t next = 0;
+
+  if (lz4fRead == NULL || buf == NULL)
+    return -LZ4F_ERROR_GENERIC;
+
+  while (next < size) {
+    size_t srcsize = lz4fRead->srcBufSize - lz4fRead->srcBufNext;
+    size_t dstsize = size - next;
+    size_t ret;
+
+    if (srcsize == 0) {
+      ret = fread(lz4fRead->srcBuf, 1, lz4fRead->srcBufMaxSize, lz4fRead->fp);
+      if (ret > 0) {
+        lz4fRead->srcBufSize = ret;
+        srcsize = lz4fRead->srcBufSize;
+        lz4fRead->srcBufNext = 0;
+      }
+      else if (ret == 0) {
+        break;
+      }
+      else {
+        return -LZ4F_ERROR_GENERIC;
+      }
+    }
+
+    ret = LZ4F_decompress(lz4fRead->dctxPtr,
+                          p, &dstsize,
+                          lz4fRead->srcBuf + lz4fRead->srcBufNext,
+                          &srcsize,
+                          NULL);
+    if (LZ4F_isError(ret)) {
+        return ret;
+    }
+
+    lz4fRead->srcBufNext += srcsize;
+    next += dstsize;
+    p += dstsize;
+  }
+
+  return next;
+}
+
+LZ4F_errorCode_t LZ4F_readClose(LZ4_readFile_t* lz4fRead)
+{
+  if (lz4fRead == NULL)
+    return -LZ4F_ERROR_GENERIC;
+  LZ4F_freeDecompressionContext(lz4fRead->dctxPtr);
+  free(lz4fRead->srcBuf);
+  free(lz4fRead);
+  return LZ4F_OK_NoError;
+}
+
+LZ4F_errorCode_t LZ4F_writeOpen(LZ4_writeFile_t** lz4fWrite, FILE* fp, const LZ4F_preferences_t* prefsPtr)
+{
+  LZ4_byte buf[LZ4F_HEADER_SIZE_MAX];
+  size_t ret;
+
+  if (fp == NULL || lz4fWrite == NULL)
+    return -LZ4F_ERROR_GENERIC;
+
+  *lz4fWrite = (LZ4_writeFile_t*)malloc(sizeof(LZ4_writeFile_t));
+  if (*lz4fWrite == NULL) {
+    return -LZ4F_ERROR_allocation_failed;
+  }
+  if (prefsPtr != NULL) {
+    switch (prefsPtr->frameInfo.blockSizeID) {
+      case LZ4F_default :
+      case LZ4F_max64KB :
+        (*lz4fWrite)->maxWriteSize = 64 * 1024;
+        break;
+      case LZ4F_max256KB:
+        (*lz4fWrite)->maxWriteSize = 256 * 1024;
+        break;
+      case LZ4F_max1MB:
+        (*lz4fWrite)->maxWriteSize = 1 * 1024 * 1024;
+        break;
+      case LZ4F_max4MB:
+        (*lz4fWrite)->maxWriteSize = 4 * 1024 * 1024;
+        break;
+      default:
+        free(lz4fWrite);
+        return -LZ4F_ERROR_maxBlockSize_invalid;
+      }
+    } else {
+      (*lz4fWrite)->maxWriteSize = 64 * 1024;
+    }
+
+  (*lz4fWrite)->dstBufMaxSize = LZ4F_compressBound((*lz4fWrite)->maxWriteSize, prefsPtr);
+  (*lz4fWrite)->dstBuf = (LZ4_byte*)malloc((*lz4fWrite)->dstBufMaxSize);
+  if ((*lz4fWrite)->dstBuf == NULL) {
+    free(*lz4fWrite);
+    return -LZ4F_ERROR_allocation_failed;
+  }
+
+  ret = LZ4F_createCompressionContext(&(*lz4fWrite)->cctxPtr, LZ4F_getVersion());
+  if (LZ4F_isError(ret)) {
+      free((*lz4fWrite)->dstBuf);
+      free(*lz4fWrite);
+      return ret;
+  }
+
+  ret = LZ4F_compressBegin((*lz4fWrite)->cctxPtr, buf, LZ4F_HEADER_SIZE_MAX, prefsPtr);
+  if (LZ4F_isError(ret)) {
+      LZ4F_freeCompressionContext((*lz4fWrite)->cctxPtr);
+      free((*lz4fWrite)->dstBuf);
+      free(*lz4fWrite);
+      return ret;
+  }
+
+  if (ret != fwrite(buf, 1, ret, fp)) {
+    LZ4F_freeCompressionContext((*lz4fWrite)->cctxPtr);
+    free((*lz4fWrite)->dstBuf);
+    free(*lz4fWrite);
+    return -LZ4F_ERROR_GENERIC;
+  }
+
+  (*lz4fWrite)->fp = fp;
+  (*lz4fWrite)->errCode = LZ4F_OK_NoError;
+  return LZ4F_OK_NoError;
+}
+
+size_t LZ4F_write(LZ4_writeFile_t* lz4fWrite, void* buf, size_t size)
+{
+  LZ4_byte* p = (LZ4_byte*)buf;
+  size_t remain = size;
+  size_t chunk;
+  size_t ret;
+
+  if (lz4fWrite == NULL || buf == NULL)
+    return -LZ4F_ERROR_GENERIC;
+  while (remain) {
+    if (remain > lz4fWrite->maxWriteSize)
+      chunk = lz4fWrite->maxWriteSize;
+    else
+      chunk = remain;
+
+    ret = LZ4F_compressUpdate(lz4fWrite->cctxPtr,
+                              lz4fWrite->dstBuf, lz4fWrite->dstBufMaxSize,
+                              p, chunk,
+                              NULL);
+    if (LZ4F_isError(ret)) {
+      lz4fWrite->errCode = ret;
+      return ret;
+    }
+
+    if(ret != fwrite(lz4fWrite->dstBuf, 1, ret, lz4fWrite->fp)) {
+      lz4fWrite->errCode = -LZ4F_ERROR_GENERIC;
+      return -LZ4F_ERROR_GENERIC;
+    }
+
+    p += chunk;
+    remain -= chunk;
+  }
+
+  return size;
+}
+
+LZ4F_errorCode_t LZ4F_writeClose(LZ4_writeFile_t* lz4fWrite)
+{
+  LZ4F_errorCode_t ret = LZ4F_OK_NoError;
+
+  if (lz4fWrite == NULL)
+    return -LZ4F_ERROR_GENERIC;
+
+  if (lz4fWrite->errCode == LZ4F_OK_NoError) {
+    ret =  LZ4F_compressEnd(lz4fWrite->cctxPtr,
+                            lz4fWrite->dstBuf, lz4fWrite->dstBufMaxSize,
+                            NULL);
+    if (LZ4F_isError(ret)) {
+      goto out;
+    }
+
+    if (ret != fwrite(lz4fWrite->dstBuf, 1, ret, lz4fWrite->fp)) {
+      ret = -LZ4F_ERROR_GENERIC;
+    }
+  }
+
+out:
+  LZ4F_freeCompressionContext(lz4fWrite->cctxPtr);
+  free(lz4fWrite->dstBuf);
+  free(lz4fWrite);
+  return ret;
+}