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443 lines
10 KiB
C
443 lines
10 KiB
C
/* 7zFile.c -- File IO
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2021-04-29 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#include "7zFile.h"
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#ifndef USE_WINDOWS_FILE
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#include <errno.h>
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#ifndef USE_FOPEN
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#include <stdio.h>
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#include <fcntl.h>
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#ifdef _WIN32
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#include <io.h>
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typedef int ssize_t;
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typedef int off_t;
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#else
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#include <unistd.h>
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#endif
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#endif
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#else
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/*
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ReadFile and WriteFile functions in Windows have BUG:
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If you Read or Write 64MB or more (probably min_failure_size = 64MB - 32KB + 1)
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from/to Network file, it returns ERROR_NO_SYSTEM_RESOURCES
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(Insufficient system resources exist to complete the requested service).
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Probably in some version of Windows there are problems with other sizes:
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for 32 MB (maybe also for 16 MB).
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And message can be "Network connection was lost"
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*/
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#endif
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#define kChunkSizeMax (1 << 22)
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void File_Construct(CSzFile *p)
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{
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#ifdef USE_WINDOWS_FILE
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p->handle = INVALID_HANDLE_VALUE;
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#elif defined(USE_FOPEN)
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p->file = NULL;
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#else
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p->fd = -1;
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#endif
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}
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#if !defined(UNDER_CE) || !defined(USE_WINDOWS_FILE)
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static WRes File_Open(CSzFile *p, const char *name, int writeMode)
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{
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#ifdef USE_WINDOWS_FILE
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p->handle = CreateFileA(name,
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writeMode ? GENERIC_WRITE : GENERIC_READ,
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FILE_SHARE_READ, NULL,
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writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL, NULL);
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return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
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#elif defined(USE_FOPEN)
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p->file = fopen(name, writeMode ? "wb+" : "rb");
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return (p->file != 0) ? 0 :
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#ifdef UNDER_CE
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2; /* ENOENT */
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#else
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errno;
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#endif
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#else
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int flags = (writeMode ? (O_CREAT | O_EXCL | O_WRONLY) : O_RDONLY);
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#ifdef O_BINARY
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flags |= O_BINARY;
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#endif
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p->fd = open(name, flags, 0666);
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return (p->fd != -1) ? 0 : errno;
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#endif
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}
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WRes InFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 0); }
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WRes OutFile_Open(CSzFile *p, const char *name)
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{
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#if defined(USE_WINDOWS_FILE) || defined(USE_FOPEN)
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return File_Open(p, name, 1);
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#else
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p->fd = creat(name, 0666);
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return (p->fd != -1) ? 0 : errno;
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#endif
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}
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#endif
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#ifdef USE_WINDOWS_FILE
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static WRes File_OpenW(CSzFile *p, const WCHAR *name, int writeMode)
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{
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p->handle = CreateFileW(name,
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writeMode ? GENERIC_WRITE : GENERIC_READ,
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FILE_SHARE_READ, NULL,
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writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL, NULL);
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return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
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}
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WRes InFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 0); }
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WRes OutFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 1); }
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#endif
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WRes File_Close(CSzFile *p)
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{
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#ifdef USE_WINDOWS_FILE
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if (p->handle != INVALID_HANDLE_VALUE)
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{
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if (!CloseHandle(p->handle))
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return GetLastError();
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p->handle = INVALID_HANDLE_VALUE;
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}
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#elif defined(USE_FOPEN)
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if (p->file != NULL)
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{
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int res = fclose(p->file);
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if (res != 0)
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{
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if (res == EOF)
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return errno;
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return res;
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}
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p->file = NULL;
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}
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#else
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if (p->fd != -1)
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{
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if (close(p->fd) != 0)
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return errno;
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p->fd = -1;
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}
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#endif
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return 0;
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}
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WRes File_Read(CSzFile *p, void *data, size_t *size)
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{
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size_t originalSize = *size;
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*size = 0;
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if (originalSize == 0)
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return 0;
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#ifdef USE_WINDOWS_FILE
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do
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{
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const DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
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DWORD processed = 0;
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const BOOL res = ReadFile(p->handle, data, curSize, &processed, NULL);
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data = (void *)((Byte *)data + processed);
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originalSize -= processed;
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*size += processed;
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if (!res)
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return GetLastError();
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// debug : we can break here for partial reading mode
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if (processed == 0)
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break;
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}
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while (originalSize > 0);
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#elif defined(USE_FOPEN)
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do
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{
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const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
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const size_t processed = fread(data, 1, curSize, p->file);
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data = (void *)((Byte *)data + (size_t)processed);
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originalSize -= processed;
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*size += processed;
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if (processed != curSize)
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return ferror(p->file);
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// debug : we can break here for partial reading mode
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if (processed == 0)
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break;
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}
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while (originalSize > 0);
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#else
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do
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{
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const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
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const ssize_t processed = read(p->fd, data, curSize);
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if (processed == -1)
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return errno;
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if (processed == 0)
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break;
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data = (void *)((Byte *)data + (size_t)processed);
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originalSize -= (size_t)processed;
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*size += (size_t)processed;
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// debug : we can break here for partial reading mode
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// break;
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}
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while (originalSize > 0);
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#endif
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return 0;
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}
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WRes File_Write(CSzFile *p, const void *data, size_t *size)
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{
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size_t originalSize = *size;
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*size = 0;
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if (originalSize == 0)
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return 0;
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#ifdef USE_WINDOWS_FILE
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do
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{
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const DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
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DWORD processed = 0;
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const BOOL res = WriteFile(p->handle, data, curSize, &processed, NULL);
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data = (const void *)((const Byte *)data + processed);
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originalSize -= processed;
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*size += processed;
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if (!res)
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return GetLastError();
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if (processed == 0)
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break;
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}
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while (originalSize > 0);
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#elif defined(USE_FOPEN)
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do
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{
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const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
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const size_t processed = fwrite(data, 1, curSize, p->file);
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data = (void *)((Byte *)data + (size_t)processed);
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originalSize -= processed;
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*size += processed;
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if (processed != curSize)
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return ferror(p->file);
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if (processed == 0)
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break;
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}
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while (originalSize > 0);
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#else
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do
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{
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const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
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const ssize_t processed = write(p->fd, data, curSize);
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if (processed == -1)
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return errno;
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if (processed == 0)
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break;
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data = (void *)((Byte *)data + (size_t)processed);
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originalSize -= (size_t)processed;
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*size += (size_t)processed;
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}
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while (originalSize > 0);
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#endif
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return 0;
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}
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WRes File_Seek(CSzFile *p, Int64 *pos, ESzSeek origin)
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{
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#ifdef USE_WINDOWS_FILE
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DWORD moveMethod;
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UInt32 low = (UInt32)*pos;
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LONG high = (LONG)((UInt64)*pos >> 16 >> 16); /* for case when UInt64 is 32-bit only */
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switch (origin)
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{
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case SZ_SEEK_SET: moveMethod = FILE_BEGIN; break;
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case SZ_SEEK_CUR: moveMethod = FILE_CURRENT; break;
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case SZ_SEEK_END: moveMethod = FILE_END; break;
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default: return ERROR_INVALID_PARAMETER;
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}
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low = SetFilePointer(p->handle, (LONG)low, &high, moveMethod);
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if (low == (UInt32)0xFFFFFFFF)
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{
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WRes res = GetLastError();
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if (res != NO_ERROR)
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return res;
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}
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*pos = ((Int64)high << 32) | low;
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return 0;
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#else
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int moveMethod; // = origin;
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switch (origin)
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{
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case SZ_SEEK_SET: moveMethod = SEEK_SET; break;
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case SZ_SEEK_CUR: moveMethod = SEEK_CUR; break;
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case SZ_SEEK_END: moveMethod = SEEK_END; break;
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default: return EINVAL;
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}
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#if defined(USE_FOPEN)
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{
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int res = fseek(p->file, (long)*pos, moveMethod);
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if (res == -1)
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return errno;
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*pos = ftell(p->file);
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if (*pos == -1)
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return errno;
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return 0;
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}
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#else
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{
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off_t res = lseek(p->fd, (off_t)*pos, moveMethod);
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if (res == -1)
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return errno;
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*pos = res;
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return 0;
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}
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#endif // USE_FOPEN
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#endif // USE_WINDOWS_FILE
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}
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WRes File_GetLength(CSzFile *p, UInt64 *length)
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{
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#ifdef USE_WINDOWS_FILE
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DWORD sizeHigh;
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DWORD sizeLow = GetFileSize(p->handle, &sizeHigh);
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if (sizeLow == 0xFFFFFFFF)
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{
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DWORD res = GetLastError();
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if (res != NO_ERROR)
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return res;
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}
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*length = (((UInt64)sizeHigh) << 32) + sizeLow;
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return 0;
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#elif defined(USE_FOPEN)
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long pos = ftell(p->file);
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int res = fseek(p->file, 0, SEEK_END);
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*length = ftell(p->file);
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fseek(p->file, pos, SEEK_SET);
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return res;
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#else
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off_t pos;
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*length = 0;
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pos = lseek(p->fd, 0, SEEK_CUR);
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if (pos != -1)
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{
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const off_t len2 = lseek(p->fd, 0, SEEK_END);
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const off_t res2 = lseek(p->fd, pos, SEEK_SET);
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if (len2 != -1)
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{
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*length = (UInt64)len2;
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if (res2 != -1)
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return 0;
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}
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}
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return errno;
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#endif
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}
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/* ---------- FileSeqInStream ---------- */
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static SRes FileSeqInStream_Read(const ISeqInStream *pp, void *buf, size_t *size)
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{
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CFileSeqInStream *p = CONTAINER_FROM_VTBL(pp, CFileSeqInStream, vt);
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WRes wres = File_Read(&p->file, buf, size);
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p->wres = wres;
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return (wres == 0) ? SZ_OK : SZ_ERROR_READ;
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}
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void FileSeqInStream_CreateVTable(CFileSeqInStream *p)
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{
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p->vt.Read = FileSeqInStream_Read;
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}
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/* ---------- FileInStream ---------- */
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static SRes FileInStream_Read(const ISeekInStream *pp, void *buf, size_t *size)
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{
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CFileInStream *p = CONTAINER_FROM_VTBL(pp, CFileInStream, vt);
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WRes wres = File_Read(&p->file, buf, size);
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p->wres = wres;
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return (wres == 0) ? SZ_OK : SZ_ERROR_READ;
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}
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static SRes FileInStream_Seek(const ISeekInStream *pp, Int64 *pos, ESzSeek origin)
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{
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CFileInStream *p = CONTAINER_FROM_VTBL(pp, CFileInStream, vt);
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WRes wres = File_Seek(&p->file, pos, origin);
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p->wres = wres;
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return (wres == 0) ? SZ_OK : SZ_ERROR_READ;
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}
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void FileInStream_CreateVTable(CFileInStream *p)
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{
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p->vt.Read = FileInStream_Read;
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p->vt.Seek = FileInStream_Seek;
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}
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/* ---------- FileOutStream ---------- */
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static size_t FileOutStream_Write(const ISeqOutStream *pp, const void *data, size_t size)
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{
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CFileOutStream *p = CONTAINER_FROM_VTBL(pp, CFileOutStream, vt);
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WRes wres = File_Write(&p->file, data, &size);
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p->wres = wres;
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return size;
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}
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void FileOutStream_CreateVTable(CFileOutStream *p)
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{
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p->vt.Write = FileOutStream_Write;
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}
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