/* ioapi.c -- IO base function header for compress/uncompress .zip
   part of the MiniZip project

   Copyright (C) 2012-2017 Nathan Moinvaziri
     https://github.com/nmoinvaz/minizip
   Modifications for Zip64 support
     Copyright (C) 2009-2010 Mathias Svensson
     http://result42.com
   Copyright (C) 1998-2010 Gilles Vollant
     http://www.winimage.com/zLibDll/minizip.html

   This program is distributed under the terms of the same license as zlib.
   See the accompanying LICENSE file for the full text of the license.
*/

#include <stdlib.h>
#include <string.h>

#if defined unix || defined __APPLE__
#include <sys/types.h>
#include <unistd.h>
#endif

#include "ioapi.h"

#if defined(_WIN32)
#  define snprintf _snprintf
#endif

voidpf call_zopen64(const zlib_filefunc64_32_def *pfilefunc, const void *filename, int mode)
{
    if (pfilefunc->zfile_func64.zopen64_file != NULL)
        return (*(pfilefunc->zfile_func64.zopen64_file)) (pfilefunc->zfile_func64.opaque, filename, mode);
    return (*(pfilefunc->zopen32_file))(pfilefunc->zfile_func64.opaque, (const char*)filename, mode);
}

voidpf call_zopendisk64(const zlib_filefunc64_32_def *pfilefunc, voidpf filestream, uint32_t number_disk, int mode)
{
    if (pfilefunc->zfile_func64.zopendisk64_file != NULL)
        return (*(pfilefunc->zfile_func64.zopendisk64_file)) (pfilefunc->zfile_func64.opaque, filestream, number_disk, mode);
    return (*(pfilefunc->zopendisk32_file))(pfilefunc->zfile_func64.opaque, filestream, number_disk, mode);
}

long call_zseek64(const zlib_filefunc64_32_def *pfilefunc, voidpf filestream, uint64_t offset, int origin)
{
    uint32_t offset_truncated = 0;
    if (pfilefunc->zfile_func64.zseek64_file != NULL)
        return (*(pfilefunc->zfile_func64.zseek64_file)) (pfilefunc->zfile_func64.opaque, filestream, offset, origin);
    offset_truncated = (uint32_t)offset;
    if (offset_truncated != offset)
        return -1;
    return (*(pfilefunc->zseek32_file))(pfilefunc->zfile_func64.opaque, filestream, offset_truncated, origin);
}

uint64_t call_ztell64(const zlib_filefunc64_32_def *pfilefunc, voidpf filestream)
{
    uint64_t position;
    if (pfilefunc->zfile_func64.zseek64_file != NULL)
        return (*(pfilefunc->zfile_func64.ztell64_file)) (pfilefunc->zfile_func64.opaque, filestream);
    position = (*(pfilefunc->ztell32_file))(pfilefunc->zfile_func64.opaque, filestream);
    if ((position) == UINT32_MAX)
        return (uint64_t)-1;
    return position;
}

void fill_zlib_filefunc64_32_def_from_filefunc32(zlib_filefunc64_32_def *p_filefunc64_32, const zlib_filefunc_def *p_filefunc32)
{
    p_filefunc64_32->zfile_func64.zopen64_file = NULL;
    p_filefunc64_32->zfile_func64.zopendisk64_file = NULL;
    p_filefunc64_32->zopen32_file = p_filefunc32->zopen_file;
    p_filefunc64_32->zopendisk32_file = p_filefunc32->zopendisk_file;
    p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
    p_filefunc64_32->zfile_func64.zread_file = p_filefunc32->zread_file;
    p_filefunc64_32->zfile_func64.zwrite_file = p_filefunc32->zwrite_file;
    p_filefunc64_32->zfile_func64.ztell64_file = NULL;
    p_filefunc64_32->zfile_func64.zseek64_file = NULL;
    p_filefunc64_32->zfile_func64.zclose_file = p_filefunc32->zclose_file;
    p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
    p_filefunc64_32->zfile_func64.opaque = p_filefunc32->opaque;
    p_filefunc64_32->zseek32_file = p_filefunc32->zseek_file;
    p_filefunc64_32->ztell32_file = p_filefunc32->ztell_file;
}

static uint32_t ZCALLBACK fread_file_func(voidpf opaque, voidpf stream, void* buf, uint32_t size);
static uint32_t ZCALLBACK fwrite_file_func(voidpf opaque, voidpf stream, const void *buf, uint32_t size);
static uint64_t ZCALLBACK ftell64_file_func(voidpf opaque, voidpf stream);
static long     ZCALLBACK fseek64_file_func(voidpf opaque, voidpf stream, uint64_t offset, int origin);
static int      ZCALLBACK fclose_file_func(voidpf opaque, voidpf stream);
static int      ZCALLBACK ferror_file_func(voidpf opaque, voidpf stream);

typedef struct
{
    FILE *file;
    int filenameLength;
    void *filename;
} FILE_IOPOSIX;

static voidpf file_build_ioposix(FILE *file, const char *filename)
{
    FILE_IOPOSIX *ioposix = NULL;
    if (file == NULL)
        return NULL;
    ioposix = (FILE_IOPOSIX*)malloc(sizeof(FILE_IOPOSIX));
    ioposix->file = file;
    ioposix->filenameLength = (int)strlen(filename) + 1;
    ioposix->filename = (char*)malloc(ioposix->filenameLength * sizeof(char));
    strncpy((char*)ioposix->filename, filename, ioposix->filenameLength);
    return (voidpf)ioposix;
}

static voidpf ZCALLBACK fopen64_file_func(ZIP_UNUSED voidpf opaque, const void *filename, int mode)
{
    FILE* file = NULL;
    const char *mode_fopen = NULL;
    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER) == ZLIB_FILEFUNC_MODE_READ)
        mode_fopen = "rb";
    else if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
        mode_fopen = "r+b";
    else if (mode & ZLIB_FILEFUNC_MODE_CREATE)
        mode_fopen = "wb";

    if ((filename != NULL) && (mode_fopen != NULL))
    {
        const char *fd_prefix = "fd:";
        if (strncmp(filename, fd_prefix, strlen(fd_prefix)) == 0)
            file = fdopen(dup(atoi(&((const char*)filename)[strlen(fd_prefix)])), mode_fopen);
        else
            file = fopen64((const char*)filename, mode_fopen);
        return file_build_ioposix(file, (const char*)filename);
    }
    return file;
}

static voidpf ZCALLBACK fopendisk64_file_func(voidpf opaque, voidpf stream, uint32_t number_disk, int mode)
{
    FILE_IOPOSIX *ioposix = NULL;
    char *diskFilename = NULL;
    voidpf ret = NULL;
    int i = 0;

    if (stream == NULL)
        return NULL;
    ioposix = (FILE_IOPOSIX*)stream;
    diskFilename = (char*)malloc(ioposix->filenameLength * sizeof(char));
    strncpy(diskFilename, (const char*)ioposix->filename, ioposix->filenameLength);
    for (i = ioposix->filenameLength - 1; i >= 0; i -= 1)
    {
        if (diskFilename[i] != '.')
            continue;
        snprintf(&diskFilename[i], ioposix->filenameLength - i, ".z%02u", number_disk + 1);
        break;
    }
    if (i >= 0)
        ret = fopen64_file_func(opaque, diskFilename, mode);
    free(diskFilename);
    return ret;
}

static uint32_t ZCALLBACK fread_file_func(ZIP_UNUSED voidpf opaque, voidpf stream, void* buf, uint32_t size)
{
    FILE_IOPOSIX *ioposix = NULL;
    uint32_t read = (uint32_t)-1;
    if (stream == NULL)
        return read;
    ioposix = (FILE_IOPOSIX*)stream;
    read = (uint32_t)fread(buf, 1, (size_t)size, ioposix->file);
    return read;
}

static uint32_t ZCALLBACK fwrite_file_func(ZIP_UNUSED voidpf opaque, voidpf stream, const void *buf, uint32_t size)
{
    FILE_IOPOSIX *ioposix = NULL;
    uint32_t written = (uint32_t)-1;
    if (stream == NULL)
        return written;
    ioposix = (FILE_IOPOSIX*)stream;
    written = (uint32_t)fwrite(buf, 1, (size_t)size, ioposix->file);
    return written;
}

static uint64_t ZCALLBACK ftell64_file_func(ZIP_UNUSED voidpf opaque, voidpf stream)
{
    FILE_IOPOSIX *ioposix = NULL;
    uint64_t ret = (uint64_t)-1;
    if (stream == NULL)
        return ret;
    ioposix = (FILE_IOPOSIX*)stream;
    ret = ftello64(ioposix->file);
    return ret;
}

static long ZCALLBACK fseek64_file_func(ZIP_UNUSED voidpf opaque, voidpf stream, uint64_t offset, int origin)
{
    FILE_IOPOSIX *ioposix = NULL;
    int fseek_origin = 0;
    long ret = 0;

    if (stream == NULL)
        return -1;
    ioposix = (FILE_IOPOSIX*)stream;

    switch (origin)
    {
        case ZLIB_FILEFUNC_SEEK_CUR:
            fseek_origin = SEEK_CUR;
            break;
        case ZLIB_FILEFUNC_SEEK_END:
            fseek_origin = SEEK_END;
            break;
        case ZLIB_FILEFUNC_SEEK_SET:
            fseek_origin = SEEK_SET;
            break;
        default:
            return -1;
    }

    if (fseeko64(ioposix->file, offset, fseek_origin) != 0)
        ret = -1;

    return ret;
}

static int ZCALLBACK fclose_file_func(ZIP_UNUSED voidpf opaque, voidpf stream)
{
    FILE_IOPOSIX *ioposix = NULL;
    int ret = -1;
    if (stream == NULL)
        return ret;
    ioposix = (FILE_IOPOSIX*)stream;
    if (ioposix->filename != NULL)
        free(ioposix->filename);
    ret = fclose(ioposix->file);
    free(ioposix);
    return ret;
}

static int ZCALLBACK ferror_file_func(ZIP_UNUSED voidpf opaque, voidpf stream)
{
    FILE_IOPOSIX *ioposix = NULL;
    int ret = -1;
    if (stream == NULL)
        return ret;
    ioposix = (FILE_IOPOSIX*)stream;
    ret = ferror(ioposix->file);
    return ret;
}

void fill_fopen64_filefunc(zlib_filefunc64_def *pzlib_filefunc_def)
{
    pzlib_filefunc_def->zopen64_file = fopen64_file_func;
    pzlib_filefunc_def->zopendisk64_file = fopendisk64_file_func;
    pzlib_filefunc_def->zread_file = fread_file_func;
    pzlib_filefunc_def->zwrite_file = fwrite_file_func;
    pzlib_filefunc_def->ztell64_file = ftell64_file_func;
    pzlib_filefunc_def->zseek64_file = fseek64_file_func;
    pzlib_filefunc_def->zclose_file = fclose_file_func;
    pzlib_filefunc_def->zerror_file = ferror_file_func;
    pzlib_filefunc_def->opaque = NULL;
}
