diff options
| -rwxr-xr-x | t/t9011-svn-da.sh | 42 | ||||
| -rw-r--r-- | vcs-svn/svndiff.c | 28 |
2 files changed, 68 insertions, 2 deletions
diff --git a/t/t9011-svn-da.sh b/t/t9011-svn-da.sh index 72691b9..f9573a1 100755 --- a/t/t9011-svn-da.sh +++ b/t/t9011-svn-da.sh @@ -168,4 +168,46 @@ test_expect_success 'catch attempt to copy missing data' ' test_must_fail test-svn-fe -d preimage copy.incomplete $len ' +test_expect_success 'copyfrom target to repeat data' ' + printf foofoo >expect && + printf "SVNQ%b%b%s" "QQ\006\004\003" "\0203\0100\003Q" "foo" | + q_to_nul >copytarget.repeat && + len=$(wc -c <copytarget.repeat) && + test-svn-fe -d preimage copytarget.repeat $len >actual && + test_cmp expect actual +' + +test_expect_success 'copyfrom target out of order' ' + printf foooof >expect && + printf "SVNQ%b%b%s" \ + "QQ\006\007\003" "\0203\0101\002\0101\001\0101Q" "foo" | + q_to_nul >copytarget.reverse && + len=$(wc -c <copytarget.reverse) && + test-svn-fe -d preimage copytarget.reverse $len >actual && + test_cmp expect actual +' + +test_expect_success 'catch copyfrom future' ' + printf "SVNQ%b%b%s" "QQ\004\004\003" "\0202\0101\002\0201" "XYZ" | + q_to_nul >copytarget.infuture && + len=$(wc -c <copytarget.infuture) && + test_must_fail test-svn-fe -d preimage copytarget.infuture $len +' + +test_expect_success 'copy to sustain' ' + printf XYXYXYXYXYXZ >expect && + printf "SVNQ%b%b%s" "QQ\014\004\003" "\0202\0111Q\0201" "XYZ" | + q_to_nul >copytarget.sustain && + len=$(wc -c <copytarget.sustain) && + test-svn-fe -d preimage copytarget.sustain $len >actual && + test_cmp expect actual +' + +test_expect_success 'catch copy that overflows' ' + printf "SVNQ%b%b%s" "QQ\003\003\001" "\0201\0177Q" X | + q_to_nul >copytarget.overflow && + len=$(wc -c <copytarget.overflow) && + test_must_fail test-svn-fe -d preimage copytarget.overflow $len +' + test_done diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c index fb7dc22..a02eee0 100644 --- a/vcs-svn/svndiff.c +++ b/vcs-svn/svndiff.c @@ -21,7 +21,12 @@ * | packed_view_selector int * | packed_copyfrom_data * ; + * view_selector ::= copyfrom_source + * | copyfrom_target + * ; + * copyfrom_target ::= # binary 01 000000; * copyfrom_data ::= # binary 10 000000; + * packed_view_selector ::= # view_selector OR-ed with 6 bit value; * packed_copyfrom_data ::= # copyfrom_data OR-ed with 6 bit value; * int ::= highdigit* lowdigit; * highdigit ::= # binary 1000 0000 OR-ed with 7 bit value; @@ -29,6 +34,7 @@ */ #define INSN_MASK 0xc0 +#define INSN_COPYFROM_TARGET 0x40 #define INSN_COPYFROM_DATA 0x80 #define OPERAND_MASK 0x3f @@ -155,6 +161,19 @@ static int read_length(struct line_buffer *in, size_t *result, off_t *len) return 0; } +static int copyfrom_target(struct window *ctx, const char **instructions, + size_t nbytes, const char *instructions_end) +{ + size_t offset; + if (parse_int(instructions, &offset, instructions_end)) + return -1; + if (offset >= ctx->out.len) + return error("invalid delta: copies from the future"); + for (; nbytes > 0; nbytes--) + strbuf_addch(&ctx->out, ctx->out.buf[offset++]); + return 0; +} + static int copyfrom_data(struct window *ctx, size_t *data_pos, size_t nbytes) { const size_t pos = *data_pos; @@ -189,9 +208,14 @@ static int execute_one_instruction(struct window *ctx, instruction = (unsigned char) **instructions; if (parse_first_operand(instructions, &nbytes, insns_end)) return -1; - if ((instruction & INSN_MASK) != INSN_COPYFROM_DATA) + switch (instruction & INSN_MASK) { + case INSN_COPYFROM_TARGET: + return copyfrom_target(ctx, instructions, nbytes, insns_end); + case INSN_COPYFROM_DATA: + return copyfrom_data(ctx, data_pos, nbytes); + default: return error("Unknown instruction %x", instruction); - return copyfrom_data(ctx, data_pos, nbytes); + } } static int apply_window_in_core(struct window *ctx) |