inffile.c

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/*
 * PROJECT:     FreeLoader
 * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
 * PURPOSE:     INF file parser that caches contents of INF file in memory.
 * COPYRIGHT:   Copyright 2002-2006 Royce Mitchell III
 *              Copyright 2003-2019 Eric Kohl
 */

/* INCLUDES *****************************************************************/

#include <freeldr.h>
#include "inffile.h"

#define CONTROL_Z  '\x1a'
#define MAX_SECTION_NAME_LEN  255
#define MAX_FIELD_LEN         511  /* larger fields get silently truncated */
/* actual string limit is MAX_INF_STRING_LENGTH+1 (plus terminating null) under Windows */
#define MAX_STRING_LEN        (MAX_INF_STRING_LENGTH+1)

#define TAG_INF_KEY 'KfnI'
#define TAG_INF_FIELD 'ffnI'
#define TAG_INF_LINE 'LfnI'
#define TAG_INF_SECTION 'SfnI'
#define TAG_INF_CACHE 'CfnI'
#define TAG_INF_FILE 'FfnI'

typedef struct _INFCACHEFIELD
{
    struct _INFCACHEFIELD *Next;
    struct _INFCACHEFIELD *Prev;

    CHAR Data[1];
} INFCACHEFIELD, *PINFCACHEFIELD;

typedef struct _INFCACHELINE
{
    struct _INFCACHELINE *Next;
    struct _INFCACHELINE *Prev;

    ULONG FieldCount;

    PCHAR Key;

    PINFCACHEFIELD FirstField;
    PINFCACHEFIELD LastField;

} INFCACHELINE, *PINFCACHELINE;

typedef struct _INFCACHESECTION
{
    struct _INFCACHESECTION *Next;
    struct _INFCACHESECTION *Prev;

    PINFCACHELINE FirstLine;
    PINFCACHELINE LastLine;

    LONG LineCount;

    CHAR Name[1];
} INFCACHESECTION, *PINFCACHESECTION;

typedef struct _INFCACHE
{
    PINFCACHESECTION FirstSection;
    PINFCACHESECTION LastSection;

    PINFCACHESECTION StringsSection;
} INFCACHE, *PINFCACHE;

/* parser definitions */
enum parser_state
{
    LINE_START,      /* at beginning of a line */
    SECTION_NAME,    /* parsing a section name */
    KEY_NAME,        /* parsing a key name */
    VALUE_NAME,      /* parsing a value name */
    EOL_BACKSLASH,   /* backslash at end of line */
    QUOTES,          /* inside quotes */
    LEADING_SPACES,  /* leading spaces */
    TRAILING_SPACES, /* trailing spaces */
    COMMENT,         /* inside a comment */
    NB_PARSER_STATES
};

struct parser
{
    const CHAR        *start;       /* start position of item being parsed */
    const CHAR        *end;         /* end of buffer */
    PINFCACHE         file;         /* file being built */
    enum parser_state state;        /* current parser state */
    enum parser_state stack[4];     /* state stack */
    int               stack_pos;    /* current pos in stack */

    PINFCACHESECTION cur_section;   /* pointer to the section being parsed*/
    PINFCACHELINE    line;          /* current line */
    unsigned int     line_pos;      /* current line position in file */
    unsigned int     error;         /* error code */
    unsigned int     token_len;     /* current token len */
    CHAR token[MAX_FIELD_LEN + 1]; /* current token */
};

typedef const CHAR * (*parser_state_func)(struct parser *parser, const CHAR *pos);

/* parser state machine functions */
static const CHAR *line_start_state(struct parser *parser, const CHAR *pos);
static const CHAR *section_name_state(struct parser *parser, const CHAR *pos);
static const CHAR *key_name_state(struct parser *parser, const CHAR *pos);
static const CHAR *value_name_state(struct parser *parser, const CHAR *pos);
static const CHAR *eol_backslash_state(struct parser *parser, const CHAR *pos);
static const CHAR *quotes_state(struct parser *parser, const CHAR *pos);
static const CHAR *leading_spaces_state(struct parser *parser, const CHAR *pos);
static const CHAR *trailing_spaces_state(struct parser *parser, const CHAR *pos);
static const CHAR *comment_state(struct parser *parser, const CHAR *pos);

static
const parser_state_func
parser_funcs[NB_PARSER_STATES] =
{
    line_start_state,      /* LINE_START */
    section_name_state,    /* SECTION_NAME */
    key_name_state,        /* KEY_NAME */
    value_name_state,      /* VALUE_NAME */
    eol_backslash_state,   /* EOL_BACKSLASH */
    quotes_state,          /* QUOTES */
    leading_spaces_state,  /* LEADING_SPACES */
    trailing_spaces_state, /* TRAILING_SPACES */
    comment_state          /* COMMENT */
};


/* PRIVATE FUNCTIONS ********************************************************/

static
PINFCACHELINE
InfpCacheFreeLine(
    PINFCACHELINE Line)
{
    PINFCACHELINE Next;
    PINFCACHEFIELD Field;

    if (Line == NULL)
    {
        return NULL;
    }

    Next = Line->Next;
    if (Line->Key != NULL)
    {
        FrLdrTempFree(Line->Key, TAG_INF_KEY);
        Line->Key = NULL;
    }

    /* Remove data fields */
    while (Line->FirstField != NULL)
    {
        Field = Line->FirstField->Next;
        FrLdrTempFree(Line->FirstField, TAG_INF_FIELD);
        Line->FirstField = Field;
    }
    Line->LastField = NULL;

    FrLdrTempFree(Line, TAG_INF_LINE);

    return Next;
}


static
PINFCACHESECTION
InfpCacheFreeSection(
    PINFCACHESECTION Section)
{
    PINFCACHESECTION Next;

    if (Section == NULL)
    {
        return NULL;
    }

    /* Release all keys */
    Next = Section->Next;
    while (Section->FirstLine != NULL)
    {
        Section->FirstLine = InfpCacheFreeLine(Section->FirstLine);
    }
    Section->LastLine = NULL;

    FrLdrTempFree(Section, TAG_INF_SECTION);

    return Next;
}


static
PINFCACHESECTION
InfpCacheFindSection(
    PINFCACHE Cache,
    PCSTR Name)
{
    PINFCACHESECTION Section = NULL;

    if (Cache == NULL || Name == NULL)
    {
        return NULL;
    }

    /* iterate through list of sections */
    Section = Cache->FirstSection;
    while (Section != NULL)
    {
        if (_stricmp(Section->Name, Name) == 0)
        {
            return Section;
        }

        /* get the next section*/
        Section = Section->Next;
    }

    return NULL;
}


static
PINFCACHESECTION
InfpCacheAddSection(
    PINFCACHE Cache,
    PCHAR Name)
{
    PINFCACHESECTION Section = NULL;
    SIZE_T Size;

    if ((Cache == NULL) || (Name == NULL))
    {
//      DPRINT("Invalid parameter\n");
        return NULL;
    }

    /* Allocate and initialize the new section */
    Size = sizeof(INFCACHESECTION) + strlen(Name);
    Section = (PINFCACHESECTION)FrLdrTempAlloc(Size, TAG_INF_SECTION);
    if (Section == NULL)
    {
//      DPRINT("RtlAllocateHeap() failed\n");
        return NULL;
    }
    memset(Section, 0, Size);

    /* Copy section name */
    strcpy(Section->Name, Name);

    /* Append section */
    if (Cache->FirstSection == NULL)
    {
        Cache->FirstSection = Section;
        Cache->LastSection = Section;
    }
    else
    {
        Cache->LastSection->Next = Section;
        Section->Prev = Cache->LastSection;
        Cache->LastSection = Section;
    }

    return Section;
}


static
PINFCACHELINE
InfpCacheAddLine(PINFCACHESECTION Section)
{
    PINFCACHELINE Line;

    if (Section == NULL)
    {
//      DPRINT("Invalid parameter\n");
        return NULL;
    }

    Line = (PINFCACHELINE)FrLdrTempAlloc(sizeof(INFCACHELINE), TAG_INF_LINE);
    if (Line == NULL)
    {
//      DPRINT("RtlAllocateHeap() failed\n");
        return NULL;
    }
    memset(Line, 0, sizeof(INFCACHELINE));

    /* Append line */
    if (Section->FirstLine == NULL)
    {
        Section->FirstLine = Line;
        Section->LastLine = Line;
    }
    else
    {
        Section->LastLine->Next = Line;
        Line->Prev = Section->LastLine;
        Section->LastLine = Line;
    }
    Section->LineCount++;

    return Line;
}


static
PVOID
InfpAddKeyToLine(
    PINFCACHELINE Line,
    PCHAR Key)
{
    if (Line == NULL)
        return NULL;

    if (Line->Key != NULL)
        return NULL;

    Line->Key = FrLdrTempAlloc(strlen(Key) + 1, TAG_INF_KEY);
    if (Line->Key == NULL)
        return NULL;

    strcpy(Line->Key, Key);

    return (PVOID)Line->Key;
}


static
PVOID
InfpAddFieldToLine(
    PINFCACHELINE Line,
    PCHAR Data)
{
    PINFCACHEFIELD Field;
    SIZE_T Size;

    Size = sizeof(INFCACHEFIELD) + strlen(Data);
    Field = (PINFCACHEFIELD)FrLdrTempAlloc(Size, TAG_INF_FIELD);
    if (Field == NULL)
    {
        return NULL;
    }
    memset(Field, 0, Size);

    strcpy(Field->Data, Data);

    /* Append key */
    if (Line->FirstField == NULL)
    {
        Line->FirstField = Field;
        Line->LastField = Field;
    }
    else
    {
        Line->LastField->Next = Field;
        Field->Prev = Line->LastField;
        Line->LastField = Field;
    }
    Line->FieldCount++;

    return (PVOID)Field;
}


static
PINFCACHELINE
InfpCacheFindKeyLine(
    PINFCACHESECTION Section,
    PCSTR Key)
{
    PINFCACHELINE Line;

    Line = Section->FirstLine;
    while (Line != NULL)
    {
        if ((Line->Key != NULL) && (_stricmp(Line->Key, Key) == 0))
        {
            return Line;
        }

        Line = Line->Next;
    }

    return NULL;
}


/* push the current state on the parser stack */
__inline static void push_state(struct parser *parser, enum parser_state state)
{
//  assert(parser->stack_pos < sizeof(parser->stack)/sizeof(parser->stack[0]));
    parser->stack[parser->stack_pos++] = state;
}


/* pop the current state */
__inline static void pop_state(struct parser *parser)
{
//  assert( parser->stack_pos );
    parser->state = parser->stack[--parser->stack_pos];
}


/* set the parser state and return the previous one */
__inline static enum parser_state set_state(struct parser *parser, enum parser_state state)
{
    enum parser_state ret = parser->state;
    parser->state = state;
    return ret;
}


/* check if the pointer points to an end of file */
__inline static int is_eof(struct parser *parser, const CHAR *ptr)
{
    return (ptr >= parser->end || *ptr == CONTROL_Z);
}


/* check if the pointer points to an end of line */
__inline static int is_eol(struct parser *parser, const CHAR *ptr)
{
    return ((ptr >= parser->end) ||
            (*ptr == CONTROL_Z) ||
            (*ptr == '\n') ||
            ((*ptr == '\r') && (*(ptr + 1) == '\n')));
}


/* push data from current token start up to pos into the current token */
static
int
push_token(
    struct parser *parser,
    const CHAR *pos)
{
    SIZE_T len = pos - parser->start;
    const CHAR *src = parser->start;
    CHAR *dst = parser->token + parser->token_len;

    if (len > MAX_FIELD_LEN - parser->token_len)
        len = MAX_FIELD_LEN - parser->token_len;

    parser->token_len += (ULONG)len;
    for ( ; len > 0; len--, dst++, src++)
        *dst = *src ? (CHAR)*src : L' ';
    *dst = 0;
    parser->start = pos;

    return 0;
}


/* add a section with the current token as name */
static
PVOID
add_section_from_token(struct parser *parser)
{
    PINFCACHESECTION Section;

    if (parser->token_len > MAX_SECTION_NAME_LEN)
    {
        parser->error = FALSE;
        return NULL;
    }

    Section = InfpCacheFindSection(parser->file, parser->token);
    if (Section == NULL)
    {
        /* need to create a new one */
        Section = InfpCacheAddSection(parser->file, parser->token);
        if (Section == NULL)
        {
            parser->error = FALSE;
            return NULL;
        }
    }

    parser->token_len = 0;
    parser->cur_section = Section;

    return (PVOID)Section;
}


/* add a field containing the current token to the current line */
static
struct field*
add_field_from_token(
    struct parser *parser,
    int is_key)
{
    PVOID field;

    if (!parser->line)  /* need to start a new line */
    {
        if (parser->cur_section == NULL)  /* got a line before the first section */
        {
            parser->error = STATUS_WRONG_INF_STYLE;
            return NULL;
        }

        parser->line = InfpCacheAddLine(parser->cur_section);
        if (parser->line == NULL)
            goto error;
    }
    else
    {
//      assert(!is_key);
    }

    if (is_key)
    {
        field = InfpAddKeyToLine(parser->line, parser->token);
    }
    else
    {
        field = InfpAddFieldToLine(parser->line, parser->token);
    }

    if (field != NULL)
    {
        parser->token_len = 0;
        return field;
    }

error:
    parser->error = FALSE;
    return NULL;
}


/* close the current line and prepare for parsing a new one */
static
VOID
close_current_line(struct parser *parser)
{
    parser->line = NULL;
}


/* handler for parser LINE_START state */
static
const CHAR*
line_start_state(
    struct parser *parser,
    const CHAR *pos)
{
    const CHAR *p;

    for (p = pos; !is_eof(parser, p); p++)
    {
        switch(*p)
        {
        case '\r':
            continue;

        case '\n':
            parser->line_pos++;
            close_current_line(parser);
            break;

        case ';':
            push_state(parser, LINE_START);
            set_state(parser, COMMENT);
            return p + 1;

        case '[':
            parser->start = p + 1;
            set_state(parser, SECTION_NAME);
            return p + 1;

        default:
            if (!isspace((unsigned char)*p))
            {
                parser->start = p;
                set_state(parser, KEY_NAME);
                return p;
            }
            break;
        }
    }
    close_current_line(parser);
    return NULL;
}


/* handler for parser SECTION_NAME state */
static
const CHAR*
section_name_state(
    struct parser *parser,
    const CHAR *pos)
{
    const CHAR *p;

    for (p = pos; !is_eol(parser, p); p++)
    {
        if (*p == ']')
        {
            push_token(parser, p);
            if (add_section_from_token(parser) == NULL)
                return NULL;
            push_state(parser, LINE_START);
            set_state(parser, COMMENT);  /* ignore everything else on the line */
            return p + 1;
        }
    }
    parser->error = STATUS_BAD_SECTION_NAME_LINE; /* unfinished section name */
    return NULL;
}


/* handler for parser KEY_NAME state */
static
const CHAR*
key_name_state(
    struct parser *parser,
    const CHAR *pos)
{
    const CHAR *p, *token_end = parser->start;

    for (p = pos; !is_eol(parser, p); p++)
    {
        if (*p == ',') break;
        switch(*p)
        {

        case '=':
            push_token(parser, token_end);
            if (!add_field_from_token(parser, 1)) return NULL;
            parser->start = p + 1;
            push_state(parser, VALUE_NAME);
            set_state(parser, LEADING_SPACES);
            return p + 1;
        case ';':
            push_token(parser, token_end);
            if (!add_field_from_token(parser, 0)) return NULL;
            push_state(parser, LINE_START);
            set_state(parser, COMMENT);
            return p + 1;
        case '"':
            push_token(parser, token_end);
            parser->start = p + 1;
            push_state(parser, KEY_NAME);
            set_state(parser, QUOTES);
            return p + 1;
        case '\\':
            push_token(parser, token_end);
            parser->start = p;
            push_state(parser, KEY_NAME);
            set_state(parser, EOL_BACKSLASH);
            return p;
        default:
            if (!isspace((unsigned char)*p)) token_end = p + 1;
            else
            {
                push_token(parser, p);
                push_state(parser, KEY_NAME);
                set_state(parser, TRAILING_SPACES);
                return p;
            }
            break;
        }
    }
    push_token(parser, token_end);
    set_state(parser, VALUE_NAME);
    return p;
}


/* handler for parser VALUE_NAME state */
static
const CHAR*
value_name_state(
    struct parser *parser,
    const CHAR *pos)
{
    const CHAR *p, *token_end = parser->start;

    for (p = pos; !is_eol(parser, p); p++)
    {
        switch(*p)
        {
        case ';':
            push_token(parser, token_end);
            if (!add_field_from_token(parser, 0)) return NULL;
            push_state(parser, LINE_START);
            set_state(parser, COMMENT);
            return p + 1;
        case ',':
            push_token(parser, token_end);
            if (!add_field_from_token(parser, 0)) return NULL;
            parser->start = p + 1;
            push_state(parser, VALUE_NAME);
            set_state(parser, LEADING_SPACES);
            return p + 1;
        case '"':
            push_token(parser, token_end);
            parser->start = p + 1;
            push_state(parser, VALUE_NAME);
            set_state(parser, QUOTES);
            return p + 1;
        case '\\':
            push_token(parser, token_end);
            parser->start = p;
            push_state(parser, VALUE_NAME);
            set_state(parser, EOL_BACKSLASH);
            return p;
        default:
            if (!isspace((unsigned char)*p)) token_end = p + 1;
            else
            {
                push_token(parser, p);
                push_state(parser, VALUE_NAME);
                set_state(parser, TRAILING_SPACES);
                return p;
            }
            break;
        }
    }
    push_token(parser, token_end);
    if (!add_field_from_token(parser, 0)) return NULL;
    set_state(parser, LINE_START);
    return p;
}


/* handler for parser EOL_BACKSLASH state */
static
const CHAR*
eol_backslash_state(
    struct parser *parser,
    const CHAR *pos )
{
    const CHAR *p;

    for (p = pos; !is_eof(parser, p); p++)
    {
        switch(*p)
        {
        case '\r':
            continue;

        case '\n':
            parser->line_pos++;
            parser->start = p + 1;
            set_state(parser, LEADING_SPACES);
            return p + 1;

        case '\\':
            continue;

        case ';':
            push_state(parser, EOL_BACKSLASH);
            set_state(parser, COMMENT);
            return p + 1;

        default:
            if (isspace((unsigned char)*p))
                continue;
            push_token(parser, p);
            pop_state(parser);
            return p;
        }
    }
    parser->start = p;
    pop_state(parser);

    return p;
}


/* handler for parser QUOTES state */
static
const CHAR*
quotes_state(
    struct parser *parser,
    const CHAR *pos )
{
    const CHAR *p, *token_end = parser->start;

    for (p = pos; !is_eol(parser, p); p++)
    {
        if (*p == '"')
        {
            if (p + 1 < parser->end && p[1] == '"') /* double quotes */
            {
                push_token(parser, p + 1);
                parser->start = token_end = p + 2;
                p++;
            }
            else  /* end of quotes */
            {
                push_token(parser, p);
                parser->start = p + 1;
                pop_state(parser);
                return p + 1;
            }
        }
    }
    push_token(parser, p);
    pop_state(parser);
    return p;
}


/* handler for parser LEADING_SPACES state */
static
const CHAR*
leading_spaces_state(
    struct parser *parser,
    const CHAR *pos )
{
    const CHAR *p;

    for (p = pos; !is_eol(parser, p); p++)
    {
        if (*p == '\\')
        {
            parser->start = p;
            set_state(parser, EOL_BACKSLASH);
            return p;
        }
        if (!isspace((unsigned char)*p))
            break;
    }
    parser->start = p;
    pop_state(parser);
    return p;
}


/* handler for parser TRAILING_SPACES state */
static
const CHAR*
trailing_spaces_state(
    struct parser *parser,
    const CHAR *pos )
{
    const CHAR *p;

    for (p = pos; !is_eol(parser, p); p++)
    {
        if (*p == '\\')
        {
            set_state(parser, EOL_BACKSLASH);
            return p;
        }
        if (!isspace((unsigned char)*p))
            break;
    }
    pop_state(parser);
    return p;
}


/* handler for parser COMMENT state */
static
const CHAR*
comment_state(
    struct parser *parser,
    const CHAR *pos )
{
    const CHAR *p = pos;

    while (!is_eol(parser, p))
        p++;
    pop_state(parser);
    return p;
}


/* parse a complete buffer */
static
BOOLEAN
InfpParseBuffer (
    PINFCACHE file,
    PCCHAR buffer,
    PCCHAR end,
    PULONG error_line)
{
    struct parser parser;
    const CHAR* pos = buffer;

    parser.start       = buffer;
    parser.end         = end;
    parser.file        = file;
    parser.line        = NULL;
    parser.state       = LINE_START;
    parser.stack_pos   = 0;
    parser.cur_section = NULL;
    parser.line_pos    = 1;
    parser.error       = TRUE;
    parser.token_len   = 0;

    /* parser main loop */
    while (pos)
        pos = (parser_funcs[parser.state])(&parser, pos);

    if (parser.error)
    {
        if (error_line)
            *error_line = parser.line_pos;
        return parser.error;
    }

    /* find the [strings] section */
    file->StringsSection = InfpCacheFindSection(file, "Strings");

    return TRUE;
}

/* PUBLIC FUNCTIONS *********************************************************/

BOOLEAN
InfOpenFile(
    PHINF InfHandle,
    PCSTR FileName,
    PULONG ErrorLine)
{
    FILEINFORMATION Information;
    ULONG FileId;
    PCHAR FileBuffer;
    ULONG FileSize, Count;
    PINFCACHE Cache;
    BOOLEAN Success;
    ARC_STATUS Status;

    *InfHandle = NULL;
    *ErrorLine = (ULONG) - 1;

    //
    // Open the .inf file
    //
    Status = ArcOpen((PSTR)FileName, OpenReadOnly, &FileId);
    if (Status != ESUCCESS)
    {
        return FALSE;
    }

    //
    // Query file size
    //
    Status = ArcGetFileInformation(FileId, &Information);
    if ((Status != ESUCCESS) || (Information.EndingAddress.HighPart != 0))
    {
        ArcClose(FileId);
        return FALSE;
    }
    FileSize = Information.EndingAddress.LowPart;

    //
    // Allocate buffer to cache the file
    //
    FileBuffer = FrLdrTempAlloc(FileSize + 1, TAG_INF_FILE);
    if (!FileBuffer)
    {
        ArcClose(FileId);
        return FALSE;
    }

    //
    // Read file into memory
    //
    Status = ArcRead(FileId, FileBuffer, FileSize, &Count);
    if ((Status != ESUCCESS) || (Count != FileSize))
    {
        ArcClose(FileId);
        FrLdrTempFree(FileBuffer, TAG_INF_FILE);
        return FALSE;
    }

    //
    // We don't need the file anymore. Close it
    //
    ArcClose(FileId);

    //
    // Append string terminator
    //
    FileBuffer[FileSize] = 0;

    //
    // Allocate infcache header
    //
    Cache = (PINFCACHE)FrLdrTempAlloc(sizeof(INFCACHE), TAG_INF_CACHE);
    if (!Cache)
    {
        FrLdrTempFree(FileBuffer, TAG_INF_FILE);
        return FALSE;
    }

    //
    // Initialize inicache header
    //
    RtlZeroMemory(Cache, sizeof(INFCACHE));

    //
    // Parse the inf buffer
    //
    Success = InfpParseBuffer(Cache,
                              FileBuffer,
                              FileBuffer + FileSize,
                              ErrorLine);
    if (!Success)
    {
        FrLdrTempFree(Cache, TAG_INF_CACHE);
        Cache = NULL;
    }

    //
    // Free file buffer, as it has been parsed
    //
    FrLdrTempFree(FileBuffer, TAG_INF_FILE);

    //
    // Return .inf parsed contents
    //
    *InfHandle = (HINF)Cache;

    return Success;
}


VOID
InfCloseFile(HINF InfHandle)
{
    PINFCACHE Cache;

    Cache = (PINFCACHE)InfHandle;

    if (Cache == NULL)
    {
        return;
    }

    while (Cache->FirstSection != NULL)
    {
        Cache->FirstSection = InfpCacheFreeSection(Cache->FirstSection);
    }
    Cache->LastSection = NULL;

    FrLdrTempFree(Cache, TAG_INF_CACHE);
}


BOOLEAN
InfFindFirstLine (
    HINF InfHandle,
    PCSTR Section,
    PCSTR Key,
    PINFCONTEXT Context)
{
    PINFCACHE Cache;
    PINFCACHESECTION CacheSection;
    PINFCACHELINE CacheLine;

    if ((InfHandle == NULL) || (Section == NULL) || (Context == NULL))
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    Cache = (PINFCACHE)InfHandle;

    /* Iterate through list of sections */
    CacheSection = Cache->FirstSection;
    while (CacheSection != NULL)
    {
//      DPRINT("Comparing '%s' and '%s'\n", CacheSection->Name, Section);

        /* Are the section names the same? */
        if (_stricmp(CacheSection->Name, Section) == 0)
        {
            if (Key != NULL)
            {
                CacheLine = InfpCacheFindKeyLine(CacheSection, Key);
            }
            else
            {
                CacheLine = CacheSection->FirstLine;
            }

            if (CacheLine == NULL)
                return FALSE;

            Context->Inf = (PVOID)Cache;
            Context->Section = (PVOID)CacheSection;
            Context->Line = (PVOID)CacheLine;

            return TRUE;
        }

        /* Get the next section */
        CacheSection = CacheSection->Next;
    }

//  DPRINT("Section not found\n");

    return FALSE;
}


BOOLEAN
InfFindNextLine (
    PINFCONTEXT ContextIn,
    PINFCONTEXT ContextOut)
{
    PINFCACHELINE CacheLine;

    if ((ContextIn == NULL) || (ContextOut == NULL))
        return FALSE;

    if (ContextIn->Line == NULL)
        return FALSE;

    CacheLine = (PINFCACHELINE)ContextIn->Line;
    if (CacheLine->Next == NULL)
        return FALSE;

    if (ContextIn != ContextOut)
    {
        ContextOut->Inf = ContextIn->Inf;
        ContextOut->Section = ContextIn->Section;
    }
    ContextOut->Line = (PVOID)(CacheLine->Next);

    return TRUE;
}


BOOLEAN
InfFindFirstMatchLine (
    PINFCONTEXT ContextIn,
    PCHAR Key,
    PINFCONTEXT ContextOut)
{
    PINFCACHELINE CacheLine;

    if ((ContextIn == NULL) || (ContextOut == NULL) || (Key == NULL) || (*Key == 0))
        return FALSE;

    if (ContextIn->Inf == NULL || ContextIn->Section == NULL)
        return FALSE;

    CacheLine = ((PINFCACHESECTION)(ContextIn->Section))->FirstLine;
    while (CacheLine != NULL)
    {
        if ((CacheLine->Key != NULL) && (_stricmp(CacheLine->Key, Key) == 0))
        {

            if (ContextIn != ContextOut)
            {
                ContextOut->Inf = ContextIn->Inf;
                ContextOut->Section = ContextIn->Section;
            }
            ContextOut->Line = (PVOID)CacheLine;

            return TRUE;
        }

        CacheLine = CacheLine->Next;
    }

    return FALSE;
}


BOOLEAN
InfFindNextMatchLine (
    PINFCONTEXT ContextIn,
    PCHAR Key,
    PINFCONTEXT ContextOut)
{
    PINFCACHELINE CacheLine;

    if ((ContextIn == NULL) || (ContextOut == NULL) || (Key == NULL) || (*Key == 0))
        return FALSE;

    if ((ContextIn->Inf == NULL) || (ContextIn->Section == NULL) || (ContextIn->Line == NULL))
        return FALSE;

    CacheLine = (PINFCACHELINE)ContextIn->Line;
    while (CacheLine != NULL)
    {
        if ((CacheLine->Key != NULL) && (_stricmp(CacheLine->Key, Key) == 0))
        {

            if (ContextIn != ContextOut)
            {
                ContextOut->Inf = ContextIn->Inf;
                ContextOut->Section = ContextIn->Section;
            }
            ContextOut->Line = (PVOID)CacheLine;

            return TRUE;
        }

        CacheLine = CacheLine->Next;
    }

    return FALSE;
}


LONG
InfGetLineCount(
    HINF InfHandle,
    PCHAR Section)
{
    PINFCACHE Cache;
    PINFCACHESECTION CacheSection;

    if ((InfHandle == NULL) || (Section == NULL))
    {
//      DPRINT("Invalid parameter\n");
        return -1;
    }

    Cache = (PINFCACHE)InfHandle;

    /* Iterate through list of sections */
    CacheSection = Cache->FirstSection;
    while (CacheSection != NULL)
    {
//      DPRINT("Comparing '%s' and '%s'\n", CacheSection->Name, Section);

        /* Are the section names the same? */
        if (_stricmp(CacheSection->Name, Section) == 0)
        {
            return CacheSection->LineCount;
        }

        /* Get the next section */
        CacheSection = CacheSection->Next;
    }

//  DPRINT("Section not found\n");

    return -1;
}


/* InfGetLineText */


LONG
InfGetFieldCount(PINFCONTEXT Context)
{
    if ((Context == NULL) || (Context->Line == NULL))
        return 0;

    return ((PINFCACHELINE)Context->Line)->FieldCount;
}


BOOLEAN
InfGetBinaryField (
    PINFCONTEXT Context,
    ULONG FieldIndex,
    PUCHAR ReturnBuffer,
    ULONG ReturnBufferSize,
    PULONG RequiredSize)
{
    PINFCACHELINE CacheLine;
    PINFCACHEFIELD CacheField;
    ULONG Index;
    ULONG Size;
    PUCHAR Ptr;

    if ((Context == NULL) || (Context->Line == NULL) || (FieldIndex == 0))
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    if (RequiredSize != NULL)
        *RequiredSize = 0;

    CacheLine = (PINFCACHELINE)Context->Line;

    if (FieldIndex > CacheLine->FieldCount)
        return FALSE;

    CacheField = CacheLine->FirstField;
    for (Index = 1; Index < FieldIndex; Index++)
        CacheField = CacheField->Next;

    Size = CacheLine->FieldCount - FieldIndex + 1;

    if (RequiredSize != NULL)
        *RequiredSize = Size;

    if (ReturnBuffer != NULL)
    {
        if (ReturnBufferSize < Size)
            return FALSE;

        /* Copy binary data */
        Ptr = ReturnBuffer;
        while (CacheField != NULL)
        {
            *Ptr = (UCHAR)atoi(CacheField->Data); //strtoul(CacheField->Data, NULL, 16);

            Ptr++;
            CacheField = CacheField->Next;
        }
    }

    return TRUE;
}


BOOLEAN
InfGetIntField (
    PINFCONTEXT Context,
    ULONG FieldIndex,
    PLONG IntegerValue)
{
    PINFCACHELINE CacheLine;
    PINFCACHEFIELD CacheField;
    ULONG Index;
    PCHAR Ptr;

    if ((Context == NULL) || (Context->Line == NULL) || (IntegerValue == NULL))
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    CacheLine = (PINFCACHELINE)Context->Line;

    if (FieldIndex > CacheLine->FieldCount)
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    if (FieldIndex == 0)
    {
        Ptr = CacheLine->Key;
    }
    else
    {
        CacheField = CacheLine->FirstField;
        for (Index = 1; Index < FieldIndex; Index++)
            CacheField = CacheField->Next;

        Ptr = CacheField->Data;
    }

    *IntegerValue = atoi(Ptr); //strtol(Ptr, NULL, 0);

    return TRUE;
}


BOOLEAN
InfGetMultiSzField (
    PINFCONTEXT Context,
    ULONG FieldIndex,
    PCHAR ReturnBuffer,
    ULONG ReturnBufferSize,
    PULONG RequiredSize)
{
    PINFCACHELINE CacheLine;
    PINFCACHEFIELD CacheField;
    PINFCACHEFIELD FieldPtr;
    ULONG Index;
    SIZE_T Size;
    PCHAR Ptr;

    if ((Context == NULL) || (Context->Line == NULL) || (FieldIndex == 0))
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    if (RequiredSize != NULL)
        *RequiredSize = 0;

    CacheLine = (PINFCACHELINE)Context->Line;

    if (FieldIndex > CacheLine->FieldCount)
        return FALSE;

    CacheField = CacheLine->FirstField;
    for (Index = 1; Index < FieldIndex; Index++)
        CacheField = CacheField->Next;

    /* Calculate the required buffer size */
    FieldPtr = CacheField;
    Size = 0;
    while (FieldPtr != NULL)
    {
        Size += (strlen(FieldPtr->Data) + 1);
        FieldPtr = FieldPtr->Next;
    }
    Size++;

    if (RequiredSize != NULL)
        *RequiredSize = (ULONG)Size;

    if (ReturnBuffer != NULL)
    {
        if (ReturnBufferSize < Size)
            return FALSE;

        /* Copy multi-sz string */
        Ptr = ReturnBuffer;
        FieldPtr = CacheField;
        while (FieldPtr != NULL)
        {
            Size = strlen(FieldPtr->Data) + 1;

            strcpy(Ptr, FieldPtr->Data);

            Ptr = Ptr + Size;
            FieldPtr = FieldPtr->Next;
        }
        *Ptr = 0;
    }

    return TRUE;
}


BOOLEAN
InfGetStringField (
    PINFCONTEXT Context,
    ULONG FieldIndex,
    PCHAR ReturnBuffer,
    ULONG ReturnBufferSize,
    PULONG RequiredSize)
{
    PINFCACHELINE CacheLine;
    PINFCACHEFIELD CacheField;
    ULONG Index;
    PCHAR Ptr;
    SIZE_T Size;

    if ((Context == NULL) || (Context->Line == NULL))
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    if (RequiredSize != NULL)
        *RequiredSize = 0;

    CacheLine = (PINFCACHELINE)Context->Line;

    if (FieldIndex > CacheLine->FieldCount)
        return FALSE;

    if (FieldIndex == 0)
    {
        Ptr = CacheLine->Key;
    }
    else
    {
        CacheField = CacheLine->FirstField;
        for (Index = 1; Index < FieldIndex; Index++)
            CacheField = CacheField->Next;

        Ptr = CacheField->Data;
    }

    Size = strlen(Ptr) + 1;

    if (RequiredSize != NULL)
        *RequiredSize = (ULONG)Size;

    if (ReturnBuffer != NULL)
    {
        if (ReturnBufferSize < Size)
            return FALSE;

        strcpy(ReturnBuffer, Ptr);
    }

    return TRUE;
}




BOOLEAN
InfGetData (
    PINFCONTEXT Context,
    PCHAR *Key,
    PCHAR *Data)
{
    PINFCACHELINE CacheKey;

    if ((Context == NULL) || (Context->Line == NULL) || (Data == NULL))
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    CacheKey = (PINFCACHELINE)Context->Line;
    if (Key != NULL)
        *Key = CacheKey->Key;

    if (Data != NULL)
    {
        if (CacheKey->FirstField == NULL)
        {
            *Data = NULL;
        }
        else
        {
            *Data = CacheKey->FirstField->Data;
        }
    }

    return TRUE;
}


BOOLEAN
InfGetDataField (
    PINFCONTEXT Context,
    ULONG FieldIndex,
    PCSTR *Data)
{
    PINFCACHELINE CacheLine;
    PINFCACHEFIELD CacheField;
    ULONG Index;

    if ((Context == NULL) || (Context->Line == NULL) || (Data == NULL))
    {
//      DPRINT("Invalid parameter\n");
        return FALSE;
    }

    CacheLine = (PINFCACHELINE)Context->Line;

    if (FieldIndex > CacheLine->FieldCount)
        return FALSE;

    if (FieldIndex == 0)
    {
        *Data = CacheLine->Key;
    }
    else
    {
        CacheField = CacheLine->FirstField;
        for (Index = 1; Index < FieldIndex; Index++)
            CacheField = CacheField->Next;

        *Data = CacheField->Data;
    }

    return TRUE;
}


/* EOF */