266 lines
8.6 KiB
C
266 lines
8.6 KiB
C
/*
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* Incbin bytecode
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*
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* Copyright (C) 2001-2007 Peter Johnson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "util.h"
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#include "libyasm-stdint.h"
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#include "coretype.h"
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#include "linemap.h"
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#include "errwarn.h"
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#include "intnum.h"
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#include "expr.h"
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#include "value.h"
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#include "bytecode.h"
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#include "file.h"
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typedef struct bytecode_incbin {
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/*@only@*/ char *filename; /* file to include data from */
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const char *from; /* filename of what contained incbin */
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/* starting offset to read from (NULL=0) */
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/*@only@*/ /*@null@*/ yasm_expr *start;
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/* maximum number of bytes to read (NULL=no limit) */
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/*@only@*/ /*@null@*/ yasm_expr *maxlen;
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} bytecode_incbin;
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static void bc_incbin_destroy(void *contents);
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static void bc_incbin_print(const void *contents, FILE *f, int indent_level);
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static void bc_incbin_finalize(yasm_bytecode *bc, yasm_bytecode *prev_bc);
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static int bc_incbin_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span,
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void *add_span_data);
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static int bc_incbin_tobytes(yasm_bytecode *bc, unsigned char **bufp,
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unsigned char *bufstart, void *d,
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yasm_output_value_func output_value,
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/*@null@*/ yasm_output_reloc_func output_reloc);
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static const yasm_bytecode_callback bc_incbin_callback = {
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bc_incbin_destroy,
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bc_incbin_print,
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bc_incbin_finalize,
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NULL,
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bc_incbin_calc_len,
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yasm_bc_expand_common,
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bc_incbin_tobytes,
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0
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};
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static void
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bc_incbin_destroy(void *contents)
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{
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bytecode_incbin *incbin = (bytecode_incbin *)contents;
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yasm_xfree(incbin->filename);
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yasm_expr_destroy(incbin->start);
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yasm_expr_destroy(incbin->maxlen);
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yasm_xfree(contents);
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}
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static void
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bc_incbin_print(const void *contents, FILE *f, int indent_level)
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{
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const bytecode_incbin *incbin = (const bytecode_incbin *)contents;
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fprintf(f, "%*s_IncBin_\n", indent_level, "");
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fprintf(f, "%*sFilename=`%s'\n", indent_level, "",
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incbin->filename);
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fprintf(f, "%*sStart=", indent_level, "");
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if (!incbin->start)
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fprintf(f, "nil (0)");
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else
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yasm_expr_print(incbin->start, f);
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fprintf(f, "%*sMax Len=", indent_level, "");
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if (!incbin->maxlen)
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fprintf(f, "nil (unlimited)");
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else
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yasm_expr_print(incbin->maxlen, f);
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fprintf(f, "\n");
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}
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static void
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bc_incbin_finalize(yasm_bytecode *bc, yasm_bytecode *prev_bc)
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{
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bytecode_incbin *incbin = (bytecode_incbin *)bc->contents;
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yasm_value val;
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if (yasm_value_finalize_expr(&val, incbin->start, prev_bc, 0))
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yasm_error_set(YASM_ERROR_TOO_COMPLEX,
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N_("start expression too complex"));
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else if (val.rel)
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yasm_error_set(YASM_ERROR_NOT_ABSOLUTE,
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N_("start expression not absolute"));
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incbin->start = val.abs;
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if (yasm_value_finalize_expr(&val, incbin->maxlen, prev_bc, 0))
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yasm_error_set(YASM_ERROR_TOO_COMPLEX,
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N_("maximum length expression too complex"));
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else if (val.rel)
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yasm_error_set(YASM_ERROR_NOT_ABSOLUTE,
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N_("maximum length expression not absolute"));
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incbin->maxlen = val.abs;
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}
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static int
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bc_incbin_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span,
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void *add_span_data)
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{
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bytecode_incbin *incbin = (bytecode_incbin *)bc->contents;
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FILE *f;
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/*@dependent@*/ /*@null@*/ const yasm_intnum *num;
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unsigned long start = 0, maxlen = 0xFFFFFFFFUL, flen;
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/* Try to convert start to integer value */
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if (incbin->start) {
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num = yasm_expr_get_intnum(&incbin->start, 0);
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if (num)
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start = yasm_intnum_get_uint(num);
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if (!num) {
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/* FIXME */
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yasm_error_set(YASM_ERROR_NOT_IMPLEMENTED,
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N_("incbin does not yet understand non-constant"));
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return -1;
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}
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}
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/* Try to convert maxlen to integer value */
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if (incbin->maxlen) {
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num = yasm_expr_get_intnum(&incbin->maxlen, 0);
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if (num)
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maxlen = yasm_intnum_get_uint(num);
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if (!num) {
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/* FIXME */
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yasm_error_set(YASM_ERROR_NOT_IMPLEMENTED,
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N_("incbin does not yet understand non-constant"));
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return -1;
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}
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}
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/* Open file and determine its length */
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f = yasm_fopen_include(incbin->filename, incbin->from, "rb", NULL);
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if (!f) {
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yasm_error_set(YASM_ERROR_IO,
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N_("`incbin': unable to open file `%s'"),
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incbin->filename);
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return -1;
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}
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if (fseek(f, 0L, SEEK_END) < 0) {
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yasm_error_set(YASM_ERROR_IO,
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N_("`incbin': unable to seek on file `%s'"),
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incbin->filename);
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return -1;
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}
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flen = (unsigned long)ftell(f);
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fclose(f);
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/* Compute length of incbin from start, maxlen, and len */
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if (start > flen) {
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yasm_warn_set(YASM_WARN_GENERAL,
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N_("`incbin': start past end of file `%s'"),
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incbin->filename);
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start = flen;
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}
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flen -= start;
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if (incbin->maxlen)
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if (maxlen < flen)
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flen = maxlen;
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bc->len += flen;
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return 0;
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}
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static int
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bc_incbin_tobytes(yasm_bytecode *bc, unsigned char **bufp,
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unsigned char *bufstart, void *d,
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yasm_output_value_func output_value,
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/*@unused@*/ yasm_output_reloc_func output_reloc)
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{
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bytecode_incbin *incbin = (bytecode_incbin *)bc->contents;
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FILE *f;
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/*@dependent@*/ /*@null@*/ const yasm_intnum *num;
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unsigned long start = 0;
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/* Convert start to integer value */
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if (incbin->start) {
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num = yasm_expr_get_intnum(&incbin->start, 0);
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if (!num)
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yasm_internal_error(
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N_("could not determine start in bc_tobytes_incbin"));
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start = yasm_intnum_get_uint(num);
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}
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/* Open file */
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f = yasm_fopen_include(incbin->filename, incbin->from, "rb", NULL);
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if (!f) {
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yasm_error_set(YASM_ERROR_IO, N_("`incbin': unable to open file `%s'"),
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incbin->filename);
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return 1;
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}
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/* Seek to start of data */
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if (fseek(f, (long)start, SEEK_SET) < 0) {
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yasm_error_set(YASM_ERROR_IO,
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N_("`incbin': unable to seek on file `%s'"),
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incbin->filename);
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fclose(f);
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return 1;
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}
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/* Read len bytes */
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if (fread(*bufp, 1, (size_t)bc->len, f) < (size_t)bc->len) {
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yasm_error_set(YASM_ERROR_IO,
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N_("`incbin': unable to read %lu bytes from file `%s'"),
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bc->len, incbin->filename);
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fclose(f);
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return 1;
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}
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*bufp += bc->len;
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fclose(f);
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return 0;
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}
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yasm_bytecode *
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yasm_bc_create_incbin(char *filename, yasm_expr *start, yasm_expr *maxlen,
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yasm_linemap *linemap, unsigned long line)
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{
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bytecode_incbin *incbin = yasm_xmalloc(sizeof(bytecode_incbin));
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unsigned long xline;
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/* Find from filename based on line number */
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yasm_linemap_lookup(linemap, line, &incbin->from, &xline);
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/*@-mustfree@*/
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incbin->filename = filename;
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incbin->start = start;
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incbin->maxlen = maxlen;
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/*@=mustfree@*/
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return yasm_bc_create_common(&bc_incbin_callback, incbin, line);
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}
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