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-rwxr-xr-xC/7zFile.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/C/7zFile.c b/C/7zFile.c
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--- /dev/null
+++ b/C/7zFile.c
@@ -0,0 +1,284 @@
+/* 7zFile.c -- File IO
+2009-11-24 : Igor Pavlov : Public domain */
+
+#include "7zFile.h"
+
+#ifndef USE_WINDOWS_FILE
+
+#ifndef UNDER_CE
+#include <errno.h>
+#endif
+
+#else
+
+/*
+ ReadFile and WriteFile functions in Windows have BUG:
+ If you Read or Write 64MB or more (probably min_failure_size = 64MB - 32KB + 1)
+ from/to Network file, it returns ERROR_NO_SYSTEM_RESOURCES
+ (Insufficient system resources exist to complete the requested service).
+ Probably in some version of Windows there are problems with other sizes:
+ for 32 MB (maybe also for 16 MB).
+ And message can be "Network connection was lost"
+*/
+
+#define kChunkSizeMax (1 << 22)
+
+#endif
+
+void File_Construct(CSzFile *p)
+{
+ #ifdef USE_WINDOWS_FILE
+ p->handle = INVALID_HANDLE_VALUE;
+ #else
+ p->file = NULL;
+ #endif
+}
+
+#if !defined(UNDER_CE) || !defined(USE_WINDOWS_FILE)
+static WRes File_Open(CSzFile *p, const char *name, int writeMode)
+{
+ #ifdef USE_WINDOWS_FILE
+ p->handle = CreateFileA(name,
+ writeMode ? GENERIC_WRITE : GENERIC_READ,
+ FILE_SHARE_READ, NULL,
+ writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
+ FILE_ATTRIBUTE_NORMAL, NULL);
+ return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
+ #else
+ p->file = fopen(name, writeMode ? "wb+" : "rb");
+ return (p->file != 0) ? 0 :
+ #ifdef UNDER_CE
+ 2; /* ENOENT */
+ #else
+ errno;
+ #endif
+ #endif
+}
+
+WRes InFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 0); }
+WRes OutFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 1); }
+#endif
+
+#ifdef USE_WINDOWS_FILE
+static WRes File_OpenW(CSzFile *p, const WCHAR *name, int writeMode)
+{
+ p->handle = CreateFileW(name,
+ writeMode ? GENERIC_WRITE : GENERIC_READ,
+ FILE_SHARE_READ, NULL,
+ writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
+ FILE_ATTRIBUTE_NORMAL, NULL);
+ return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
+}
+WRes InFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 0); }
+WRes OutFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 1); }
+#endif
+
+WRes File_Close(CSzFile *p)
+{
+ #ifdef USE_WINDOWS_FILE
+ if (p->handle != INVALID_HANDLE_VALUE)
+ {
+ if (!CloseHandle(p->handle))
+ return GetLastError();
+ p->handle = INVALID_HANDLE_VALUE;
+ }
+ #else
+ if (p->file != NULL)
+ {
+ int res = fclose(p->file);
+ if (res != 0)
+ return res;
+ p->file = NULL;
+ }
+ #endif
+ return 0;
+}
+
+WRes File_Read(CSzFile *p, void *data, size_t *size)
+{
+ size_t originalSize = *size;
+ if (originalSize == 0)
+ return 0;
+
+ #ifdef USE_WINDOWS_FILE
+
+ *size = 0;
+ do
+ {
+ DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
+ DWORD processed = 0;
+ BOOL res = ReadFile(p->handle, data, curSize, &processed, NULL);
+ data = (void *)((Byte *)data + processed);
+ originalSize -= processed;
+ *size += processed;
+ if (!res)
+ return GetLastError();
+ if (processed == 0)
+ break;
+ }
+ while (originalSize > 0);
+ return 0;
+
+ #else
+
+ *size = fread(data, 1, originalSize, p->file);
+ if (*size == originalSize)
+ return 0;
+ return ferror(p->file);
+
+ #endif
+}
+
+WRes File_Write(CSzFile *p, const void *data, size_t *size)
+{
+ size_t originalSize = *size;
+ if (originalSize == 0)
+ return 0;
+
+ #ifdef USE_WINDOWS_FILE
+
+ *size = 0;
+ do
+ {
+ DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
+ DWORD processed = 0;
+ BOOL res = WriteFile(p->handle, data, curSize, &processed, NULL);
+ data = (void *)((Byte *)data + processed);
+ originalSize -= processed;
+ *size += processed;
+ if (!res)
+ return GetLastError();
+ if (processed == 0)
+ break;
+ }
+ while (originalSize > 0);
+ return 0;
+
+ #else
+
+ *size = fwrite(data, 1, originalSize, p->file);
+ if (*size == originalSize)
+ return 0;
+ return ferror(p->file);
+
+ #endif
+}
+
+WRes File_Seek(CSzFile *p, Int64 *pos, ESzSeek origin)
+{
+ #ifdef USE_WINDOWS_FILE
+
+ LARGE_INTEGER value;
+ DWORD moveMethod;
+ value.LowPart = (DWORD)*pos;
+ value.HighPart = (LONG)((UInt64)*pos >> 16 >> 16); /* for case when UInt64 is 32-bit only */
+ switch (origin)
+ {
+ case SZ_SEEK_SET: moveMethod = FILE_BEGIN; break;
+ case SZ_SEEK_CUR: moveMethod = FILE_CURRENT; break;
+ case SZ_SEEK_END: moveMethod = FILE_END; break;
+ default: return ERROR_INVALID_PARAMETER;
+ }
+ value.LowPart = SetFilePointer(p->handle, value.LowPart, &value.HighPart, moveMethod);
+ if (value.LowPart == 0xFFFFFFFF)
+ {
+ WRes res = GetLastError();
+ if (res != NO_ERROR)
+ return res;
+ }
+ *pos = ((Int64)value.HighPart << 32) | value.LowPart;
+ return 0;
+
+ #else
+
+ int moveMethod;
+ int res;
+ switch (origin)
+ {
+ case SZ_SEEK_SET: moveMethod = SEEK_SET; break;
+ case SZ_SEEK_CUR: moveMethod = SEEK_CUR; break;
+ case SZ_SEEK_END: moveMethod = SEEK_END; break;
+ default: return 1;
+ }
+ res = fseek(p->file, (long)*pos, moveMethod);
+ *pos = ftell(p->file);
+ return res;
+
+ #endif
+}
+
+WRes File_GetLength(CSzFile *p, UInt64 *length)
+{
+ #ifdef USE_WINDOWS_FILE
+
+ DWORD sizeHigh;
+ DWORD sizeLow = GetFileSize(p->handle, &sizeHigh);
+ if (sizeLow == 0xFFFFFFFF)
+ {
+ DWORD res = GetLastError();
+ if (res != NO_ERROR)
+ return res;
+ }
+ *length = (((UInt64)sizeHigh) << 32) + sizeLow;
+ return 0;
+
+ #else
+
+ long pos = ftell(p->file);
+ int res = fseek(p->file, 0, SEEK_END);
+ *length = ftell(p->file);
+ fseek(p->file, pos, SEEK_SET);
+ return res;
+
+ #endif
+}
+
+
+/* ---------- FileSeqInStream ---------- */
+
+static SRes FileSeqInStream_Read(void *pp, void *buf, size_t *size)
+{
+ CFileSeqInStream *p = (CFileSeqInStream *)pp;
+ return File_Read(&p->file, buf, size) == 0 ? SZ_OK : SZ_ERROR_READ;
+}
+
+void FileSeqInStream_CreateVTable(CFileSeqInStream *p)
+{
+ p->s.Read = FileSeqInStream_Read;
+}
+
+
+/* ---------- FileInStream ---------- */
+
+static SRes FileInStream_Read(void *pp, void *buf, size_t *size)
+{
+ CFileInStream *p = (CFileInStream *)pp;
+ return (File_Read(&p->file, buf, size) == 0) ? SZ_OK : SZ_ERROR_READ;
+}
+
+static SRes FileInStream_Seek(void *pp, Int64 *pos, ESzSeek origin)
+{
+ CFileInStream *p = (CFileInStream *)pp;
+ return File_Seek(&p->file, pos, origin);
+}
+
+void FileInStream_CreateVTable(CFileInStream *p)
+{
+ p->s.Read = FileInStream_Read;
+ p->s.Seek = FileInStream_Seek;
+}
+
+
+/* ---------- FileOutStream ---------- */
+
+static size_t FileOutStream_Write(void *pp, const void *data, size_t size)
+{
+ CFileOutStream *p = (CFileOutStream *)pp;
+ File_Write(&p->file, data, &size);
+ return size;
+}
+
+void FileOutStream_CreateVTable(CFileOutStream *p)
+{
+ p->s.Write = FileOutStream_Write;
+}